1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Procedures for interfacing to Open Firmware. 4 * 5 * Paul Mackerras August 1996. 6 * Copyright (C) 1996-2005 Paul Mackerras. 7 * 8 * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner. 9 * {engebret|bergner}@us.ibm.com 10 */ 11 12 #undef DEBUG_PROM 13 14 /* we cannot use FORTIFY as it brings in new symbols */ 15 #define __NO_FORTIFY 16 17 #include <stdarg.h> 18 #include <linux/kernel.h> 19 #include <linux/string.h> 20 #include <linux/init.h> 21 #include <linux/threads.h> 22 #include <linux/spinlock.h> 23 #include <linux/types.h> 24 #include <linux/pci.h> 25 #include <linux/proc_fs.h> 26 #include <linux/delay.h> 27 #include <linux/initrd.h> 28 #include <linux/bitops.h> 29 #include <linux/pgtable.h> 30 #include <linux/printk.h> 31 #include <asm/prom.h> 32 #include <asm/rtas.h> 33 #include <asm/page.h> 34 #include <asm/processor.h> 35 #include <asm/interrupt.h> 36 #include <asm/irq.h> 37 #include <asm/io.h> 38 #include <asm/smp.h> 39 #include <asm/mmu.h> 40 #include <asm/iommu.h> 41 #include <asm/btext.h> 42 #include <asm/sections.h> 43 #include <asm/machdep.h> 44 #include <asm/asm-prototypes.h> 45 #include <asm/ultravisor-api.h> 46 47 #include <linux/linux_logo.h> 48 49 /* All of prom_init bss lives here */ 50 #define __prombss __section(".bss.prominit") 51 52 /* 53 * Eventually bump that one up 54 */ 55 #define DEVTREE_CHUNK_SIZE 0x100000 56 57 /* 58 * This is the size of the local memory reserve map that gets copied 59 * into the boot params passed to the kernel. That size is totally 60 * flexible as the kernel just reads the list until it encounters an 61 * entry with size 0, so it can be changed without breaking binary 62 * compatibility 63 */ 64 #define MEM_RESERVE_MAP_SIZE 8 65 66 /* 67 * prom_init() is called very early on, before the kernel text 68 * and data have been mapped to KERNELBASE. At this point the code 69 * is running at whatever address it has been loaded at. 70 * On ppc32 we compile with -mrelocatable, which means that references 71 * to extern and static variables get relocated automatically. 72 * ppc64 objects are always relocatable, we just need to relocate the 73 * TOC. 74 * 75 * Because OF may have mapped I/O devices into the area starting at 76 * KERNELBASE, particularly on CHRP machines, we can't safely call 77 * OF once the kernel has been mapped to KERNELBASE. Therefore all 78 * OF calls must be done within prom_init(). 79 * 80 * ADDR is used in calls to call_prom. The 4th and following 81 * arguments to call_prom should be 32-bit values. 82 * On ppc64, 64 bit values are truncated to 32 bits (and 83 * fortunately don't get interpreted as two arguments). 84 */ 85 #define ADDR(x) (u32)(unsigned long)(x) 86 87 #ifdef CONFIG_PPC64 88 #define OF_WORKAROUNDS 0 89 #else 90 #define OF_WORKAROUNDS of_workarounds 91 static int of_workarounds __prombss; 92 #endif 93 94 #define OF_WA_CLAIM 1 /* do phys/virt claim separately, then map */ 95 #define OF_WA_LONGTRAIL 2 /* work around longtrail bugs */ 96 97 #define PROM_BUG() do { \ 98 prom_printf("kernel BUG at %s line 0x%x!\n", \ 99 __FILE__, __LINE__); \ 100 __builtin_trap(); \ 101 } while (0) 102 103 #ifdef DEBUG_PROM 104 #define prom_debug(x...) prom_printf(x) 105 #else 106 #define prom_debug(x...) do { } while (0) 107 #endif 108 109 110 typedef u32 prom_arg_t; 111 112 struct prom_args { 113 __be32 service; 114 __be32 nargs; 115 __be32 nret; 116 __be32 args[10]; 117 }; 118 119 struct prom_t { 120 ihandle root; 121 phandle chosen; 122 int cpu; 123 ihandle stdout; 124 ihandle mmumap; 125 ihandle memory; 126 }; 127 128 struct mem_map_entry { 129 __be64 base; 130 __be64 size; 131 }; 132 133 typedef __be32 cell_t; 134 135 extern void __start(unsigned long r3, unsigned long r4, unsigned long r5, 136 unsigned long r6, unsigned long r7, unsigned long r8, 137 unsigned long r9); 138 139 #ifdef CONFIG_PPC64 140 extern int enter_prom(struct prom_args *args, unsigned long entry); 141 #else 142 static inline int enter_prom(struct prom_args *args, unsigned long entry) 143 { 144 return ((int (*)(struct prom_args *))entry)(args); 145 } 146 #endif 147 148 extern void copy_and_flush(unsigned long dest, unsigned long src, 149 unsigned long size, unsigned long offset); 150 151 /* prom structure */ 152 static struct prom_t __prombss prom; 153 154 static unsigned long __prombss prom_entry; 155 156 static char __prombss of_stdout_device[256]; 157 static char __prombss prom_scratch[256]; 158 159 static unsigned long __prombss dt_header_start; 160 static unsigned long __prombss dt_struct_start, dt_struct_end; 161 static unsigned long __prombss dt_string_start, dt_string_end; 162 163 static unsigned long __prombss prom_initrd_start, prom_initrd_end; 164 165 #ifdef CONFIG_PPC64 166 static int __prombss prom_iommu_force_on; 167 static int __prombss prom_iommu_off; 168 static unsigned long __prombss prom_tce_alloc_start; 169 static unsigned long __prombss prom_tce_alloc_end; 170 #endif 171 172 #ifdef CONFIG_PPC_PSERIES 173 static bool __prombss prom_radix_disable; 174 static bool __prombss prom_radix_gtse_disable; 175 static bool __prombss prom_xive_disable; 176 #endif 177 178 #ifdef CONFIG_PPC_SVM 179 static bool __prombss prom_svm_enable; 180 #endif 181 182 struct platform_support { 183 bool hash_mmu; 184 bool radix_mmu; 185 bool radix_gtse; 186 bool xive; 187 }; 188 189 /* Platforms codes are now obsolete in the kernel. Now only used within this 190 * file and ultimately gone too. Feel free to change them if you need, they 191 * are not shared with anything outside of this file anymore 192 */ 193 #define PLATFORM_PSERIES 0x0100 194 #define PLATFORM_PSERIES_LPAR 0x0101 195 #define PLATFORM_LPAR 0x0001 196 #define PLATFORM_POWERMAC 0x0400 197 #define PLATFORM_GENERIC 0x0500 198 199 static int __prombss of_platform; 200 201 static char __prombss prom_cmd_line[COMMAND_LINE_SIZE]; 202 203 static unsigned long __prombss prom_memory_limit; 204 205 static unsigned long __prombss alloc_top; 206 static unsigned long __prombss alloc_top_high; 207 static unsigned long __prombss alloc_bottom; 208 static unsigned long __prombss rmo_top; 209 static unsigned long __prombss ram_top; 210 211 static struct mem_map_entry __prombss mem_reserve_map[MEM_RESERVE_MAP_SIZE]; 212 static int __prombss mem_reserve_cnt; 213 214 static cell_t __prombss regbuf[1024]; 215 216 static bool __prombss rtas_has_query_cpu_stopped; 217 218 219 /* 220 * Error results ... some OF calls will return "-1" on error, some 221 * will return 0, some will return either. To simplify, here are 222 * macros to use with any ihandle or phandle return value to check if 223 * it is valid 224 */ 225 226 #define PROM_ERROR (-1u) 227 #define PHANDLE_VALID(p) ((p) != 0 && (p) != PROM_ERROR) 228 #define IHANDLE_VALID(i) ((i) != 0 && (i) != PROM_ERROR) 229 230 /* Copied from lib/string.c and lib/kstrtox.c */ 231 232 static int __init prom_strcmp(const char *cs, const char *ct) 233 { 234 unsigned char c1, c2; 235 236 while (1) { 237 c1 = *cs++; 238 c2 = *ct++; 239 if (c1 != c2) 240 return c1 < c2 ? -1 : 1; 241 if (!c1) 242 break; 243 } 244 return 0; 245 } 246 247 static ssize_t __init prom_strscpy_pad(char *dest, const char *src, size_t n) 248 { 249 ssize_t rc; 250 size_t i; 251 252 if (n == 0 || n > INT_MAX) 253 return -E2BIG; 254 255 // Copy up to n bytes 256 for (i = 0; i < n && src[i] != '\0'; i++) 257 dest[i] = src[i]; 258 259 rc = i; 260 261 // If we copied all n then we have run out of space for the nul 262 if (rc == n) { 263 // Rewind by one character to ensure nul termination 264 i--; 265 rc = -E2BIG; 266 } 267 268 for (; i < n; i++) 269 dest[i] = '\0'; 270 271 return rc; 272 } 273 274 static int __init prom_strncmp(const char *cs, const char *ct, size_t count) 275 { 276 unsigned char c1, c2; 277 278 while (count) { 279 c1 = *cs++; 280 c2 = *ct++; 281 if (c1 != c2) 282 return c1 < c2 ? -1 : 1; 283 if (!c1) 284 break; 285 count--; 286 } 287 return 0; 288 } 289 290 static size_t __init prom_strlen(const char *s) 291 { 292 const char *sc; 293 294 for (sc = s; *sc != '\0'; ++sc) 295 /* nothing */; 296 return sc - s; 297 } 298 299 static int __init prom_memcmp(const void *cs, const void *ct, size_t count) 300 { 301 const unsigned char *su1, *su2; 302 int res = 0; 303 304 for (su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--) 305 if ((res = *su1 - *su2) != 0) 306 break; 307 return res; 308 } 309 310 static char __init *prom_strstr(const char *s1, const char *s2) 311 { 312 size_t l1, l2; 313 314 l2 = prom_strlen(s2); 315 if (!l2) 316 return (char *)s1; 317 l1 = prom_strlen(s1); 318 while (l1 >= l2) { 319 l1--; 320 if (!prom_memcmp(s1, s2, l2)) 321 return (char *)s1; 322 s1++; 323 } 324 return NULL; 325 } 326 327 static size_t __init prom_strlcat(char *dest, const char *src, size_t count) 328 { 329 size_t dsize = prom_strlen(dest); 330 size_t len = prom_strlen(src); 331 size_t res = dsize + len; 332 333 /* This would be a bug */ 334 if (dsize >= count) 335 return count; 336 337 dest += dsize; 338 count -= dsize; 339 if (len >= count) 340 len = count-1; 341 memcpy(dest, src, len); 342 dest[len] = 0; 343 return res; 344 345 } 346 347 #ifdef CONFIG_PPC_PSERIES 348 static int __init prom_strtobool(const char *s, bool *res) 349 { 350 if (!s) 351 return -EINVAL; 352 353 switch (s[0]) { 354 case 'y': 355 case 'Y': 356 case '1': 357 *res = true; 358 return 0; 359 case 'n': 360 case 'N': 361 case '0': 362 *res = false; 363 return 0; 364 case 'o': 365 case 'O': 366 switch (s[1]) { 367 case 'n': 368 case 'N': 369 *res = true; 370 return 0; 371 case 'f': 372 case 'F': 373 *res = false; 374 return 0; 375 default: 376 break; 377 } 378 break; 379 default: 380 break; 381 } 382 383 return -EINVAL; 384 } 385 #endif 386 387 /* This is the one and *ONLY* place where we actually call open 388 * firmware. 389 */ 390 391 static int __init call_prom(const char *service, int nargs, int nret, ...) 392 { 393 int i; 394 struct prom_args args; 395 va_list list; 396 397 args.service = cpu_to_be32(ADDR(service)); 398 args.nargs = cpu_to_be32(nargs); 399 args.nret = cpu_to_be32(nret); 400 401 va_start(list, nret); 402 for (i = 0; i < nargs; i++) 403 args.args[i] = cpu_to_be32(va_arg(list, prom_arg_t)); 404 va_end(list); 405 406 for (i = 0; i < nret; i++) 407 args.args[nargs+i] = 0; 408 409 if (enter_prom(&args, prom_entry) < 0) 410 return PROM_ERROR; 411 412 return (nret > 0) ? be32_to_cpu(args.args[nargs]) : 0; 413 } 414 415 static int __init call_prom_ret(const char *service, int nargs, int nret, 416 prom_arg_t *rets, ...) 417 { 418 int i; 419 struct prom_args args; 420 va_list list; 421 422 args.service = cpu_to_be32(ADDR(service)); 423 args.nargs = cpu_to_be32(nargs); 424 args.nret = cpu_to_be32(nret); 425 426 va_start(list, rets); 427 for (i = 0; i < nargs; i++) 428 args.args[i] = cpu_to_be32(va_arg(list, prom_arg_t)); 429 va_end(list); 430 431 for (i = 0; i < nret; i++) 432 args.args[nargs+i] = 0; 433 434 if (enter_prom(&args, prom_entry) < 0) 435 return PROM_ERROR; 436 437 if (rets != NULL) 438 for (i = 1; i < nret; ++i) 439 rets[i-1] = be32_to_cpu(args.args[nargs+i]); 440 441 return (nret > 0) ? be32_to_cpu(args.args[nargs]) : 0; 442 } 443 444 445 static void __init prom_print(const char *msg) 446 { 447 const char *p, *q; 448 449 if (prom.stdout == 0) 450 return; 451 452 for (p = msg; *p != 0; p = q) { 453 for (q = p; *q != 0 && *q != '\n'; ++q) 454 ; 455 if (q > p) 456 call_prom("write", 3, 1, prom.stdout, p, q - p); 457 if (*q == 0) 458 break; 459 ++q; 460 call_prom("write", 3, 1, prom.stdout, ADDR("\r\n"), 2); 461 } 462 } 463 464 465 /* 466 * Both prom_print_hex & prom_print_dec takes an unsigned long as input so that 467 * we do not need __udivdi3 or __umoddi3 on 32bits. 468 */ 469 static void __init prom_print_hex(unsigned long val) 470 { 471 int i, nibbles = sizeof(val)*2; 472 char buf[sizeof(val)*2+1]; 473 474 for (i = nibbles-1; i >= 0; i--) { 475 buf[i] = (val & 0xf) + '0'; 476 if (buf[i] > '9') 477 buf[i] += ('a'-'0'-10); 478 val >>= 4; 479 } 480 buf[nibbles] = '\0'; 481 call_prom("write", 3, 1, prom.stdout, buf, nibbles); 482 } 483 484 /* max number of decimal digits in an unsigned long */ 485 #define UL_DIGITS 21 486 static void __init prom_print_dec(unsigned long val) 487 { 488 int i, size; 489 char buf[UL_DIGITS+1]; 490 491 for (i = UL_DIGITS-1; i >= 0; i--) { 492 buf[i] = (val % 10) + '0'; 493 val = val/10; 494 if (val == 0) 495 break; 496 } 497 /* shift stuff down */ 498 size = UL_DIGITS - i; 499 call_prom("write", 3, 1, prom.stdout, buf+i, size); 500 } 501 502 __printf(1, 2) 503 static void __init prom_printf(const char *format, ...) 504 { 505 const char *p, *q, *s; 506 va_list args; 507 unsigned long v; 508 long vs; 509 int n = 0; 510 511 va_start(args, format); 512 for (p = format; *p != 0; p = q) { 513 for (q = p; *q != 0 && *q != '\n' && *q != '%'; ++q) 514 ; 515 if (q > p) 516 call_prom("write", 3, 1, prom.stdout, p, q - p); 517 if (*q == 0) 518 break; 519 if (*q == '\n') { 520 ++q; 521 call_prom("write", 3, 1, prom.stdout, 522 ADDR("\r\n"), 2); 523 continue; 524 } 525 ++q; 526 if (*q == 0) 527 break; 528 while (*q == 'l') { 529 ++q; 530 ++n; 531 } 532 switch (*q) { 533 case 's': 534 ++q; 535 s = va_arg(args, const char *); 536 prom_print(s); 537 break; 538 case 'x': 539 ++q; 540 switch (n) { 541 case 0: 542 v = va_arg(args, unsigned int); 543 break; 544 case 1: 545 v = va_arg(args, unsigned long); 546 break; 547 case 2: 548 default: 549 v = va_arg(args, unsigned long long); 550 break; 551 } 552 prom_print_hex(v); 553 break; 554 case 'u': 555 ++q; 556 switch (n) { 557 case 0: 558 v = va_arg(args, unsigned int); 559 break; 560 case 1: 561 v = va_arg(args, unsigned long); 562 break; 563 case 2: 564 default: 565 v = va_arg(args, unsigned long long); 566 break; 567 } 568 prom_print_dec(v); 569 break; 570 case 'd': 571 ++q; 572 switch (n) { 573 case 0: 574 vs = va_arg(args, int); 575 break; 576 case 1: 577 vs = va_arg(args, long); 578 break; 579 case 2: 580 default: 581 vs = va_arg(args, long long); 582 break; 583 } 584 if (vs < 0) { 585 prom_print("-"); 586 vs = -vs; 587 } 588 prom_print_dec(vs); 589 break; 590 } 591 } 592 va_end(args); 593 } 594 595 596 static unsigned int __init prom_claim(unsigned long virt, unsigned long size, 597 unsigned long align) 598 { 599 600 if (align == 0 && (OF_WORKAROUNDS & OF_WA_CLAIM)) { 601 /* 602 * Old OF requires we claim physical and virtual separately 603 * and then map explicitly (assuming virtual mode) 604 */ 605 int ret; 606 prom_arg_t result; 607 608 ret = call_prom_ret("call-method", 5, 2, &result, 609 ADDR("claim"), prom.memory, 610 align, size, virt); 611 if (ret != 0 || result == -1) 612 return -1; 613 ret = call_prom_ret("call-method", 5, 2, &result, 614 ADDR("claim"), prom.mmumap, 615 align, size, virt); 616 if (ret != 0) { 617 call_prom("call-method", 4, 1, ADDR("release"), 618 prom.memory, size, virt); 619 return -1; 620 } 621 /* the 0x12 is M (coherence) + PP == read/write */ 622 call_prom("call-method", 6, 1, 623 ADDR("map"), prom.mmumap, 0x12, size, virt, virt); 624 return virt; 625 } 626 return call_prom("claim", 3, 1, (prom_arg_t)virt, (prom_arg_t)size, 627 (prom_arg_t)align); 628 } 629 630 static void __init __attribute__((noreturn)) prom_panic(const char *reason) 631 { 632 prom_print(reason); 633 /* Do not call exit because it clears the screen on pmac 634 * it also causes some sort of double-fault on early pmacs */ 635 if (of_platform == PLATFORM_POWERMAC) 636 asm("trap\n"); 637 638 /* ToDo: should put up an SRC here on pSeries */ 639 call_prom("exit", 0, 0); 640 641 for (;;) /* should never get here */ 642 ; 643 } 644 645 646 static int __init prom_next_node(phandle *nodep) 647 { 648 phandle node; 649 650 if ((node = *nodep) != 0 651 && (*nodep = call_prom("child", 1, 1, node)) != 0) 652 return 1; 653 if ((*nodep = call_prom("peer", 1, 1, node)) != 0) 654 return 1; 655 for (;;) { 656 if ((node = call_prom("parent", 1, 1, node)) == 0) 657 return 0; 658 if ((*nodep = call_prom("peer", 1, 1, node)) != 0) 659 return 1; 660 } 661 } 662 663 static inline int __init prom_getprop(phandle node, const char *pname, 664 void *value, size_t valuelen) 665 { 666 return call_prom("getprop", 4, 1, node, ADDR(pname), 667 (u32)(unsigned long) value, (u32) valuelen); 668 } 669 670 static inline int __init prom_getproplen(phandle node, const char *pname) 671 { 672 return call_prom("getproplen", 2, 1, node, ADDR(pname)); 673 } 674 675 static void add_string(char **str, const char *q) 676 { 677 char *p = *str; 678 679 while (*q) 680 *p++ = *q++; 681 *p++ = ' '; 682 *str = p; 683 } 684 685 static char *tohex(unsigned int x) 686 { 687 static const char digits[] __initconst = "0123456789abcdef"; 688 static char result[9] __prombss; 689 int i; 690 691 result[8] = 0; 692 i = 8; 693 do { 694 --i; 695 result[i] = digits[x & 0xf]; 696 x >>= 4; 697 } while (x != 0 && i > 0); 698 return &result[i]; 699 } 700 701 static int __init prom_setprop(phandle node, const char *nodename, 702 const char *pname, void *value, size_t valuelen) 703 { 704 char cmd[256], *p; 705 706 if (!(OF_WORKAROUNDS & OF_WA_LONGTRAIL)) 707 return call_prom("setprop", 4, 1, node, ADDR(pname), 708 (u32)(unsigned long) value, (u32) valuelen); 709 710 /* gah... setprop doesn't work on longtrail, have to use interpret */ 711 p = cmd; 712 add_string(&p, "dev"); 713 add_string(&p, nodename); 714 add_string(&p, tohex((u32)(unsigned long) value)); 715 add_string(&p, tohex(valuelen)); 716 add_string(&p, tohex(ADDR(pname))); 717 add_string(&p, tohex(prom_strlen(pname))); 718 add_string(&p, "property"); 719 *p = 0; 720 return call_prom("interpret", 1, 1, (u32)(unsigned long) cmd); 721 } 722 723 /* We can't use the standard versions because of relocation headaches. */ 724 #define prom_isxdigit(c) \ 725 (('0' <= (c) && (c) <= '9') || ('a' <= (c) && (c) <= 'f') || ('A' <= (c) && (c) <= 'F')) 726 727 #define prom_isdigit(c) ('0' <= (c) && (c) <= '9') 728 #define prom_islower(c) ('a' <= (c) && (c) <= 'z') 729 #define prom_toupper(c) (prom_islower(c) ? ((c) - 'a' + 'A') : (c)) 730 731 static unsigned long prom_strtoul(const char *cp, const char **endp) 732 { 733 unsigned long result = 0, base = 10, value; 734 735 if (*cp == '0') { 736 base = 8; 737 cp++; 738 if (prom_toupper(*cp) == 'X') { 739 cp++; 740 base = 16; 741 } 742 } 743 744 while (prom_isxdigit(*cp) && 745 (value = prom_isdigit(*cp) ? *cp - '0' : prom_toupper(*cp) - 'A' + 10) < base) { 746 result = result * base + value; 747 cp++; 748 } 749 750 if (endp) 751 *endp = cp; 752 753 return result; 754 } 755 756 static unsigned long prom_memparse(const char *ptr, const char **retptr) 757 { 758 unsigned long ret = prom_strtoul(ptr, retptr); 759 int shift = 0; 760 761 /* 762 * We can't use a switch here because GCC *may* generate a 763 * jump table which won't work, because we're not running at 764 * the address we're linked at. 765 */ 766 if ('G' == **retptr || 'g' == **retptr) 767 shift = 30; 768 769 if ('M' == **retptr || 'm' == **retptr) 770 shift = 20; 771 772 if ('K' == **retptr || 'k' == **retptr) 773 shift = 10; 774 775 if (shift) { 776 ret <<= shift; 777 (*retptr)++; 778 } 779 780 return ret; 781 } 782 783 /* 784 * Early parsing of the command line passed to the kernel, used for 785 * "mem=x" and the options that affect the iommu 786 */ 787 static void __init early_cmdline_parse(void) 788 { 789 const char *opt; 790 791 char *p; 792 int l = 0; 793 794 prom_cmd_line[0] = 0; 795 p = prom_cmd_line; 796 797 if (!IS_ENABLED(CONFIG_CMDLINE_FORCE) && (long)prom.chosen > 0) 798 l = prom_getprop(prom.chosen, "bootargs", p, COMMAND_LINE_SIZE-1); 799 800 if (IS_ENABLED(CONFIG_CMDLINE_EXTEND) || l <= 0 || p[0] == '\0') 801 prom_strlcat(prom_cmd_line, " " CONFIG_CMDLINE, 802 sizeof(prom_cmd_line)); 803 804 prom_printf("command line: %s\n", prom_cmd_line); 805 806 #ifdef CONFIG_PPC64 807 opt = prom_strstr(prom_cmd_line, "iommu="); 808 if (opt) { 809 prom_printf("iommu opt is: %s\n", opt); 810 opt += 6; 811 while (*opt && *opt == ' ') 812 opt++; 813 if (!prom_strncmp(opt, "off", 3)) 814 prom_iommu_off = 1; 815 else if (!prom_strncmp(opt, "force", 5)) 816 prom_iommu_force_on = 1; 817 } 818 #endif 819 opt = prom_strstr(prom_cmd_line, "mem="); 820 if (opt) { 821 opt += 4; 822 prom_memory_limit = prom_memparse(opt, (const char **)&opt); 823 #ifdef CONFIG_PPC64 824 /* Align to 16 MB == size of ppc64 large page */ 825 prom_memory_limit = ALIGN(prom_memory_limit, 0x1000000); 826 #endif 827 } 828 829 #ifdef CONFIG_PPC_PSERIES 830 prom_radix_disable = !IS_ENABLED(CONFIG_PPC_RADIX_MMU_DEFAULT); 831 opt = prom_strstr(prom_cmd_line, "disable_radix"); 832 if (opt) { 833 opt += 13; 834 if (*opt && *opt == '=') { 835 bool val; 836 837 if (prom_strtobool(++opt, &val)) 838 prom_radix_disable = false; 839 else 840 prom_radix_disable = val; 841 } else 842 prom_radix_disable = true; 843 } 844 if (prom_radix_disable) 845 prom_debug("Radix disabled from cmdline\n"); 846 847 opt = prom_strstr(prom_cmd_line, "radix_hcall_invalidate=on"); 848 if (opt) { 849 prom_radix_gtse_disable = true; 850 prom_debug("Radix GTSE disabled from cmdline\n"); 851 } 852 853 opt = prom_strstr(prom_cmd_line, "xive=off"); 854 if (opt) { 855 prom_xive_disable = true; 856 prom_debug("XIVE disabled from cmdline\n"); 857 } 858 #endif /* CONFIG_PPC_PSERIES */ 859 860 #ifdef CONFIG_PPC_SVM 861 opt = prom_strstr(prom_cmd_line, "svm="); 862 if (opt) { 863 bool val; 864 865 opt += sizeof("svm=") - 1; 866 if (!prom_strtobool(opt, &val)) 867 prom_svm_enable = val; 868 } 869 #endif /* CONFIG_PPC_SVM */ 870 } 871 872 #ifdef CONFIG_PPC_PSERIES 873 /* 874 * The architecture vector has an array of PVR mask/value pairs, 875 * followed by # option vectors - 1, followed by the option vectors. 876 * 877 * See prom.h for the definition of the bits specified in the 878 * architecture vector. 879 */ 880 881 /* Firmware expects the value to be n - 1, where n is the # of vectors */ 882 #define NUM_VECTORS(n) ((n) - 1) 883 884 /* 885 * Firmware expects 1 + n - 2, where n is the length of the option vector in 886 * bytes. The 1 accounts for the length byte itself, the - 2 .. ? 887 */ 888 #define VECTOR_LENGTH(n) (1 + (n) - 2) 889 890 struct option_vector1 { 891 u8 byte1; 892 u8 arch_versions; 893 u8 arch_versions3; 894 } __packed; 895 896 struct option_vector2 { 897 u8 byte1; 898 __be16 reserved; 899 __be32 real_base; 900 __be32 real_size; 901 __be32 virt_base; 902 __be32 virt_size; 903 __be32 load_base; 904 __be32 min_rma; 905 __be32 min_load; 906 u8 min_rma_percent; 907 u8 max_pft_size; 908 } __packed; 909 910 struct option_vector3 { 911 u8 byte1; 912 u8 byte2; 913 } __packed; 914 915 struct option_vector4 { 916 u8 byte1; 917 u8 min_vp_cap; 918 } __packed; 919 920 struct option_vector5 { 921 u8 byte1; 922 u8 byte2; 923 u8 byte3; 924 u8 cmo; 925 u8 associativity; 926 u8 bin_opts; 927 u8 micro_checkpoint; 928 u8 reserved0; 929 __be32 max_cpus; 930 __be16 papr_level; 931 __be16 reserved1; 932 u8 platform_facilities; 933 u8 reserved2; 934 __be16 reserved3; 935 u8 subprocessors; 936 u8 byte22; 937 u8 intarch; 938 u8 mmu; 939 u8 hash_ext; 940 u8 radix_ext; 941 } __packed; 942 943 struct option_vector6 { 944 u8 reserved; 945 u8 secondary_pteg; 946 u8 os_name; 947 } __packed; 948 949 struct option_vector7 { 950 u8 os_id[256]; 951 } __packed; 952 953 struct ibm_arch_vec { 954 struct { u32 mask, val; } pvrs[14]; 955 956 u8 num_vectors; 957 958 u8 vec1_len; 959 struct option_vector1 vec1; 960 961 u8 vec2_len; 962 struct option_vector2 vec2; 963 964 u8 vec3_len; 965 struct option_vector3 vec3; 966 967 u8 vec4_len; 968 struct option_vector4 vec4; 969 970 u8 vec5_len; 971 struct option_vector5 vec5; 972 973 u8 vec6_len; 974 struct option_vector6 vec6; 975 976 u8 vec7_len; 977 struct option_vector7 vec7; 978 } __packed; 979 980 static const struct ibm_arch_vec ibm_architecture_vec_template __initconst = { 981 .pvrs = { 982 { 983 .mask = cpu_to_be32(0xfffe0000), /* POWER5/POWER5+ */ 984 .val = cpu_to_be32(0x003a0000), 985 }, 986 { 987 .mask = cpu_to_be32(0xffff0000), /* POWER6 */ 988 .val = cpu_to_be32(0x003e0000), 989 }, 990 { 991 .mask = cpu_to_be32(0xffff0000), /* POWER7 */ 992 .val = cpu_to_be32(0x003f0000), 993 }, 994 { 995 .mask = cpu_to_be32(0xffff0000), /* POWER8E */ 996 .val = cpu_to_be32(0x004b0000), 997 }, 998 { 999 .mask = cpu_to_be32(0xffff0000), /* POWER8NVL */ 1000 .val = cpu_to_be32(0x004c0000), 1001 }, 1002 { 1003 .mask = cpu_to_be32(0xffff0000), /* POWER8 */ 1004 .val = cpu_to_be32(0x004d0000), 1005 }, 1006 { 1007 .mask = cpu_to_be32(0xffff0000), /* POWER9 */ 1008 .val = cpu_to_be32(0x004e0000), 1009 }, 1010 { 1011 .mask = cpu_to_be32(0xffff0000), /* POWER10 */ 1012 .val = cpu_to_be32(0x00800000), 1013 }, 1014 { 1015 .mask = cpu_to_be32(0xffffffff), /* all 3.1-compliant */ 1016 .val = cpu_to_be32(0x0f000006), 1017 }, 1018 { 1019 .mask = cpu_to_be32(0xffffffff), /* all 3.00-compliant */ 1020 .val = cpu_to_be32(0x0f000005), 1021 }, 1022 { 1023 .mask = cpu_to_be32(0xffffffff), /* all 2.07-compliant */ 1024 .val = cpu_to_be32(0x0f000004), 1025 }, 1026 { 1027 .mask = cpu_to_be32(0xffffffff), /* all 2.06-compliant */ 1028 .val = cpu_to_be32(0x0f000003), 1029 }, 1030 { 1031 .mask = cpu_to_be32(0xffffffff), /* all 2.05-compliant */ 1032 .val = cpu_to_be32(0x0f000002), 1033 }, 1034 { 1035 .mask = cpu_to_be32(0xfffffffe), /* all 2.04-compliant and earlier */ 1036 .val = cpu_to_be32(0x0f000001), 1037 }, 1038 }, 1039 1040 .num_vectors = NUM_VECTORS(6), 1041 1042 .vec1_len = VECTOR_LENGTH(sizeof(struct option_vector1)), 1043 .vec1 = { 1044 .byte1 = 0, 1045 .arch_versions = OV1_PPC_2_00 | OV1_PPC_2_01 | OV1_PPC_2_02 | OV1_PPC_2_03 | 1046 OV1_PPC_2_04 | OV1_PPC_2_05 | OV1_PPC_2_06 | OV1_PPC_2_07, 1047 .arch_versions3 = OV1_PPC_3_00 | OV1_PPC_3_1, 1048 }, 1049 1050 .vec2_len = VECTOR_LENGTH(sizeof(struct option_vector2)), 1051 /* option vector 2: Open Firmware options supported */ 1052 .vec2 = { 1053 .byte1 = OV2_REAL_MODE, 1054 .reserved = 0, 1055 .real_base = cpu_to_be32(0xffffffff), 1056 .real_size = cpu_to_be32(0xffffffff), 1057 .virt_base = cpu_to_be32(0xffffffff), 1058 .virt_size = cpu_to_be32(0xffffffff), 1059 .load_base = cpu_to_be32(0xffffffff), 1060 .min_rma = cpu_to_be32(512), /* 512MB min RMA */ 1061 .min_load = cpu_to_be32(0xffffffff), /* full client load */ 1062 .min_rma_percent = 0, /* min RMA percentage of total RAM */ 1063 .max_pft_size = 48, /* max log_2(hash table size) */ 1064 }, 1065 1066 .vec3_len = VECTOR_LENGTH(sizeof(struct option_vector3)), 1067 /* option vector 3: processor options supported */ 1068 .vec3 = { 1069 .byte1 = 0, /* don't ignore, don't halt */ 1070 .byte2 = OV3_FP | OV3_VMX | OV3_DFP, 1071 }, 1072 1073 .vec4_len = VECTOR_LENGTH(sizeof(struct option_vector4)), 1074 /* option vector 4: IBM PAPR implementation */ 1075 .vec4 = { 1076 .byte1 = 0, /* don't halt */ 1077 .min_vp_cap = OV4_MIN_ENT_CAP, /* minimum VP entitled capacity */ 1078 }, 1079 1080 .vec5_len = VECTOR_LENGTH(sizeof(struct option_vector5)), 1081 /* option vector 5: PAPR/OF options */ 1082 .vec5 = { 1083 .byte1 = 0, /* don't ignore, don't halt */ 1084 .byte2 = OV5_FEAT(OV5_LPAR) | OV5_FEAT(OV5_SPLPAR) | OV5_FEAT(OV5_LARGE_PAGES) | 1085 OV5_FEAT(OV5_DRCONF_MEMORY) | OV5_FEAT(OV5_DONATE_DEDICATE_CPU) | 1086 #ifdef CONFIG_PCI_MSI 1087 /* PCIe/MSI support. Without MSI full PCIe is not supported */ 1088 OV5_FEAT(OV5_MSI), 1089 #else 1090 0, 1091 #endif 1092 .byte3 = 0, 1093 .cmo = 1094 #ifdef CONFIG_PPC_SMLPAR 1095 OV5_FEAT(OV5_CMO) | OV5_FEAT(OV5_XCMO), 1096 #else 1097 0, 1098 #endif 1099 .associativity = OV5_FEAT(OV5_TYPE1_AFFINITY) | OV5_FEAT(OV5_PRRN), 1100 .bin_opts = OV5_FEAT(OV5_RESIZE_HPT) | OV5_FEAT(OV5_HP_EVT), 1101 .micro_checkpoint = 0, 1102 .reserved0 = 0, 1103 .max_cpus = cpu_to_be32(NR_CPUS), /* number of cores supported */ 1104 .papr_level = 0, 1105 .reserved1 = 0, 1106 .platform_facilities = OV5_FEAT(OV5_PFO_HW_RNG) | OV5_FEAT(OV5_PFO_HW_ENCR) | OV5_FEAT(OV5_PFO_HW_842), 1107 .reserved2 = 0, 1108 .reserved3 = 0, 1109 .subprocessors = 1, 1110 .byte22 = OV5_FEAT(OV5_DRMEM_V2) | OV5_FEAT(OV5_DRC_INFO), 1111 .intarch = 0, 1112 .mmu = 0, 1113 .hash_ext = 0, 1114 .radix_ext = 0, 1115 }, 1116 1117 /* option vector 6: IBM PAPR hints */ 1118 .vec6_len = VECTOR_LENGTH(sizeof(struct option_vector6)), 1119 .vec6 = { 1120 .reserved = 0, 1121 .secondary_pteg = 0, 1122 .os_name = OV6_LINUX, 1123 }, 1124 1125 /* option vector 7: OS Identification */ 1126 .vec7_len = VECTOR_LENGTH(sizeof(struct option_vector7)), 1127 }; 1128 1129 static struct ibm_arch_vec __prombss ibm_architecture_vec ____cacheline_aligned; 1130 1131 /* Old method - ELF header with PT_NOTE sections only works on BE */ 1132 #ifdef __BIG_ENDIAN__ 1133 static const struct fake_elf { 1134 Elf32_Ehdr elfhdr; 1135 Elf32_Phdr phdr[2]; 1136 struct chrpnote { 1137 u32 namesz; 1138 u32 descsz; 1139 u32 type; 1140 char name[8]; /* "PowerPC" */ 1141 struct chrpdesc { 1142 u32 real_mode; 1143 u32 real_base; 1144 u32 real_size; 1145 u32 virt_base; 1146 u32 virt_size; 1147 u32 load_base; 1148 } chrpdesc; 1149 } chrpnote; 1150 struct rpanote { 1151 u32 namesz; 1152 u32 descsz; 1153 u32 type; 1154 char name[24]; /* "IBM,RPA-Client-Config" */ 1155 struct rpadesc { 1156 u32 lpar_affinity; 1157 u32 min_rmo_size; 1158 u32 min_rmo_percent; 1159 u32 max_pft_size; 1160 u32 splpar; 1161 u32 min_load; 1162 u32 new_mem_def; 1163 u32 ignore_me; 1164 } rpadesc; 1165 } rpanote; 1166 } fake_elf __initconst = { 1167 .elfhdr = { 1168 .e_ident = { 0x7f, 'E', 'L', 'F', 1169 ELFCLASS32, ELFDATA2MSB, EV_CURRENT }, 1170 .e_type = ET_EXEC, /* yeah right */ 1171 .e_machine = EM_PPC, 1172 .e_version = EV_CURRENT, 1173 .e_phoff = offsetof(struct fake_elf, phdr), 1174 .e_phentsize = sizeof(Elf32_Phdr), 1175 .e_phnum = 2 1176 }, 1177 .phdr = { 1178 [0] = { 1179 .p_type = PT_NOTE, 1180 .p_offset = offsetof(struct fake_elf, chrpnote), 1181 .p_filesz = sizeof(struct chrpnote) 1182 }, [1] = { 1183 .p_type = PT_NOTE, 1184 .p_offset = offsetof(struct fake_elf, rpanote), 1185 .p_filesz = sizeof(struct rpanote) 1186 } 1187 }, 1188 .chrpnote = { 1189 .namesz = sizeof("PowerPC"), 1190 .descsz = sizeof(struct chrpdesc), 1191 .type = 0x1275, 1192 .name = "PowerPC", 1193 .chrpdesc = { 1194 .real_mode = ~0U, /* ~0 means "don't care" */ 1195 .real_base = ~0U, 1196 .real_size = ~0U, 1197 .virt_base = ~0U, 1198 .virt_size = ~0U, 1199 .load_base = ~0U 1200 }, 1201 }, 1202 .rpanote = { 1203 .namesz = sizeof("IBM,RPA-Client-Config"), 1204 .descsz = sizeof(struct rpadesc), 1205 .type = 0x12759999, 1206 .name = "IBM,RPA-Client-Config", 1207 .rpadesc = { 1208 .lpar_affinity = 0, 1209 .min_rmo_size = 64, /* in megabytes */ 1210 .min_rmo_percent = 0, 1211 .max_pft_size = 48, /* 2^48 bytes max PFT size */ 1212 .splpar = 1, 1213 .min_load = ~0U, 1214 .new_mem_def = 0 1215 } 1216 } 1217 }; 1218 #endif /* __BIG_ENDIAN__ */ 1219 1220 static int __init prom_count_smt_threads(void) 1221 { 1222 phandle node; 1223 char type[64]; 1224 unsigned int plen; 1225 1226 /* Pick up th first CPU node we can find */ 1227 for (node = 0; prom_next_node(&node); ) { 1228 type[0] = 0; 1229 prom_getprop(node, "device_type", type, sizeof(type)); 1230 1231 if (prom_strcmp(type, "cpu")) 1232 continue; 1233 /* 1234 * There is an entry for each smt thread, each entry being 1235 * 4 bytes long. All cpus should have the same number of 1236 * smt threads, so return after finding the first. 1237 */ 1238 plen = prom_getproplen(node, "ibm,ppc-interrupt-server#s"); 1239 if (plen == PROM_ERROR) 1240 break; 1241 plen >>= 2; 1242 prom_debug("Found %lu smt threads per core\n", (unsigned long)plen); 1243 1244 /* Sanity check */ 1245 if (plen < 1 || plen > 64) { 1246 prom_printf("Threads per core %lu out of bounds, assuming 1\n", 1247 (unsigned long)plen); 1248 return 1; 1249 } 1250 return plen; 1251 } 1252 prom_debug("No threads found, assuming 1 per core\n"); 1253 1254 return 1; 1255 1256 } 1257 1258 static void __init prom_parse_mmu_model(u8 val, 1259 struct platform_support *support) 1260 { 1261 switch (val) { 1262 case OV5_FEAT(OV5_MMU_DYNAMIC): 1263 case OV5_FEAT(OV5_MMU_EITHER): /* Either Available */ 1264 prom_debug("MMU - either supported\n"); 1265 support->radix_mmu = !prom_radix_disable; 1266 support->hash_mmu = true; 1267 break; 1268 case OV5_FEAT(OV5_MMU_RADIX): /* Only Radix */ 1269 prom_debug("MMU - radix only\n"); 1270 if (prom_radix_disable) { 1271 /* 1272 * If we __have__ to do radix, we're better off ignoring 1273 * the command line rather than not booting. 1274 */ 1275 prom_printf("WARNING: Ignoring cmdline option disable_radix\n"); 1276 } 1277 support->radix_mmu = true; 1278 break; 1279 case OV5_FEAT(OV5_MMU_HASH): 1280 prom_debug("MMU - hash only\n"); 1281 support->hash_mmu = true; 1282 break; 1283 default: 1284 prom_debug("Unknown mmu support option: 0x%x\n", val); 1285 break; 1286 } 1287 } 1288 1289 static void __init prom_parse_xive_model(u8 val, 1290 struct platform_support *support) 1291 { 1292 switch (val) { 1293 case OV5_FEAT(OV5_XIVE_EITHER): /* Either Available */ 1294 prom_debug("XIVE - either mode supported\n"); 1295 support->xive = !prom_xive_disable; 1296 break; 1297 case OV5_FEAT(OV5_XIVE_EXPLOIT): /* Only Exploitation mode */ 1298 prom_debug("XIVE - exploitation mode supported\n"); 1299 if (prom_xive_disable) { 1300 /* 1301 * If we __have__ to do XIVE, we're better off ignoring 1302 * the command line rather than not booting. 1303 */ 1304 prom_printf("WARNING: Ignoring cmdline option xive=off\n"); 1305 } 1306 support->xive = true; 1307 break; 1308 case OV5_FEAT(OV5_XIVE_LEGACY): /* Only Legacy mode */ 1309 prom_debug("XIVE - legacy mode supported\n"); 1310 break; 1311 default: 1312 prom_debug("Unknown xive support option: 0x%x\n", val); 1313 break; 1314 } 1315 } 1316 1317 static void __init prom_parse_platform_support(u8 index, u8 val, 1318 struct platform_support *support) 1319 { 1320 switch (index) { 1321 case OV5_INDX(OV5_MMU_SUPPORT): /* MMU Model */ 1322 prom_parse_mmu_model(val & OV5_FEAT(OV5_MMU_SUPPORT), support); 1323 break; 1324 case OV5_INDX(OV5_RADIX_GTSE): /* Radix Extensions */ 1325 if (val & OV5_FEAT(OV5_RADIX_GTSE)) 1326 support->radix_gtse = !prom_radix_gtse_disable; 1327 break; 1328 case OV5_INDX(OV5_XIVE_SUPPORT): /* Interrupt mode */ 1329 prom_parse_xive_model(val & OV5_FEAT(OV5_XIVE_SUPPORT), 1330 support); 1331 break; 1332 } 1333 } 1334 1335 static void __init prom_check_platform_support(void) 1336 { 1337 struct platform_support supported = { 1338 .hash_mmu = false, 1339 .radix_mmu = false, 1340 .radix_gtse = false, 1341 .xive = false 1342 }; 1343 int prop_len = prom_getproplen(prom.chosen, 1344 "ibm,arch-vec-5-platform-support"); 1345 1346 /* 1347 * First copy the architecture vec template 1348 * 1349 * use memcpy() instead of *vec = *vec_template so that GCC replaces it 1350 * by __memcpy() when KASAN is active 1351 */ 1352 memcpy(&ibm_architecture_vec, &ibm_architecture_vec_template, 1353 sizeof(ibm_architecture_vec)); 1354 1355 prom_strscpy_pad(ibm_architecture_vec.vec7.os_id, linux_banner, 256); 1356 1357 if (prop_len > 1) { 1358 int i; 1359 u8 vec[8]; 1360 prom_debug("Found ibm,arch-vec-5-platform-support, len: %d\n", 1361 prop_len); 1362 if (prop_len > sizeof(vec)) 1363 prom_printf("WARNING: ibm,arch-vec-5-platform-support longer than expected (len: %d)\n", 1364 prop_len); 1365 prom_getprop(prom.chosen, "ibm,arch-vec-5-platform-support", &vec, sizeof(vec)); 1366 for (i = 0; i < prop_len; i += 2) { 1367 prom_debug("%d: index = 0x%x val = 0x%x\n", i / 2, vec[i], vec[i + 1]); 1368 prom_parse_platform_support(vec[i], vec[i + 1], &supported); 1369 } 1370 } 1371 1372 if (supported.radix_mmu && IS_ENABLED(CONFIG_PPC_RADIX_MMU)) { 1373 /* Radix preferred - Check if GTSE is also supported */ 1374 prom_debug("Asking for radix\n"); 1375 ibm_architecture_vec.vec5.mmu = OV5_FEAT(OV5_MMU_RADIX); 1376 if (supported.radix_gtse) 1377 ibm_architecture_vec.vec5.radix_ext = 1378 OV5_FEAT(OV5_RADIX_GTSE); 1379 else 1380 prom_debug("Radix GTSE isn't supported\n"); 1381 } else if (supported.hash_mmu) { 1382 /* Default to hash mmu (if we can) */ 1383 prom_debug("Asking for hash\n"); 1384 ibm_architecture_vec.vec5.mmu = OV5_FEAT(OV5_MMU_HASH); 1385 } else { 1386 /* We're probably on a legacy hypervisor */ 1387 prom_debug("Assuming legacy hash support\n"); 1388 } 1389 1390 if (supported.xive) { 1391 prom_debug("Asking for XIVE\n"); 1392 ibm_architecture_vec.vec5.intarch = OV5_FEAT(OV5_XIVE_EXPLOIT); 1393 } 1394 } 1395 1396 static void __init prom_send_capabilities(void) 1397 { 1398 ihandle root; 1399 prom_arg_t ret; 1400 u32 cores; 1401 1402 /* Check ibm,arch-vec-5-platform-support and fixup vec5 if required */ 1403 prom_check_platform_support(); 1404 1405 root = call_prom("open", 1, 1, ADDR("/")); 1406 if (root != 0) { 1407 /* We need to tell the FW about the number of cores we support. 1408 * 1409 * To do that, we count the number of threads on the first core 1410 * (we assume this is the same for all cores) and use it to 1411 * divide NR_CPUS. 1412 */ 1413 1414 cores = DIV_ROUND_UP(NR_CPUS, prom_count_smt_threads()); 1415 prom_printf("Max number of cores passed to firmware: %u (NR_CPUS = %d)\n", 1416 cores, NR_CPUS); 1417 1418 ibm_architecture_vec.vec5.max_cpus = cpu_to_be32(cores); 1419 1420 /* try calling the ibm,client-architecture-support method */ 1421 prom_printf("Calling ibm,client-architecture-support..."); 1422 if (call_prom_ret("call-method", 3, 2, &ret, 1423 ADDR("ibm,client-architecture-support"), 1424 root, 1425 ADDR(&ibm_architecture_vec)) == 0) { 1426 /* the call exists... */ 1427 if (ret) 1428 prom_printf("\nWARNING: ibm,client-architecture" 1429 "-support call FAILED!\n"); 1430 call_prom("close", 1, 0, root); 1431 prom_printf(" done\n"); 1432 return; 1433 } 1434 call_prom("close", 1, 0, root); 1435 prom_printf(" not implemented\n"); 1436 } 1437 1438 #ifdef __BIG_ENDIAN__ 1439 { 1440 ihandle elfloader; 1441 1442 /* no ibm,client-architecture-support call, try the old way */ 1443 elfloader = call_prom("open", 1, 1, 1444 ADDR("/packages/elf-loader")); 1445 if (elfloader == 0) { 1446 prom_printf("couldn't open /packages/elf-loader\n"); 1447 return; 1448 } 1449 call_prom("call-method", 3, 1, ADDR("process-elf-header"), 1450 elfloader, ADDR(&fake_elf)); 1451 call_prom("close", 1, 0, elfloader); 1452 } 1453 #endif /* __BIG_ENDIAN__ */ 1454 } 1455 #endif /* CONFIG_PPC_PSERIES */ 1456 1457 /* 1458 * Memory allocation strategy... our layout is normally: 1459 * 1460 * at 14Mb or more we have vmlinux, then a gap and initrd. In some 1461 * rare cases, initrd might end up being before the kernel though. 1462 * We assume this won't override the final kernel at 0, we have no 1463 * provision to handle that in this version, but it should hopefully 1464 * never happen. 1465 * 1466 * alloc_top is set to the top of RMO, eventually shrink down if the 1467 * TCEs overlap 1468 * 1469 * alloc_bottom is set to the top of kernel/initrd 1470 * 1471 * from there, allocations are done this way : rtas is allocated 1472 * topmost, and the device-tree is allocated from the bottom. We try 1473 * to grow the device-tree allocation as we progress. If we can't, 1474 * then we fail, we don't currently have a facility to restart 1475 * elsewhere, but that shouldn't be necessary. 1476 * 1477 * Note that calls to reserve_mem have to be done explicitly, memory 1478 * allocated with either alloc_up or alloc_down isn't automatically 1479 * reserved. 1480 */ 1481 1482 1483 /* 1484 * Allocates memory in the RMO upward from the kernel/initrd 1485 * 1486 * When align is 0, this is a special case, it means to allocate in place 1487 * at the current location of alloc_bottom or fail (that is basically 1488 * extending the previous allocation). Used for the device-tree flattening 1489 */ 1490 static unsigned long __init alloc_up(unsigned long size, unsigned long align) 1491 { 1492 unsigned long base = alloc_bottom; 1493 unsigned long addr = 0; 1494 1495 if (align) 1496 base = ALIGN(base, align); 1497 prom_debug("%s(%lx, %lx)\n", __func__, size, align); 1498 if (ram_top == 0) 1499 prom_panic("alloc_up() called with mem not initialized\n"); 1500 1501 if (align) 1502 base = ALIGN(alloc_bottom, align); 1503 else 1504 base = alloc_bottom; 1505 1506 for(; (base + size) <= alloc_top; 1507 base = ALIGN(base + 0x100000, align)) { 1508 prom_debug(" trying: 0x%lx\n\r", base); 1509 addr = (unsigned long)prom_claim(base, size, 0); 1510 if (addr != PROM_ERROR && addr != 0) 1511 break; 1512 addr = 0; 1513 if (align == 0) 1514 break; 1515 } 1516 if (addr == 0) 1517 return 0; 1518 alloc_bottom = addr + size; 1519 1520 prom_debug(" -> %lx\n", addr); 1521 prom_debug(" alloc_bottom : %lx\n", alloc_bottom); 1522 prom_debug(" alloc_top : %lx\n", alloc_top); 1523 prom_debug(" alloc_top_hi : %lx\n", alloc_top_high); 1524 prom_debug(" rmo_top : %lx\n", rmo_top); 1525 prom_debug(" ram_top : %lx\n", ram_top); 1526 1527 return addr; 1528 } 1529 1530 /* 1531 * Allocates memory downward, either from top of RMO, or if highmem 1532 * is set, from the top of RAM. Note that this one doesn't handle 1533 * failures. It does claim memory if highmem is not set. 1534 */ 1535 static unsigned long __init alloc_down(unsigned long size, unsigned long align, 1536 int highmem) 1537 { 1538 unsigned long base, addr = 0; 1539 1540 prom_debug("%s(%lx, %lx, %s)\n", __func__, size, align, 1541 highmem ? "(high)" : "(low)"); 1542 if (ram_top == 0) 1543 prom_panic("alloc_down() called with mem not initialized\n"); 1544 1545 if (highmem) { 1546 /* Carve out storage for the TCE table. */ 1547 addr = ALIGN_DOWN(alloc_top_high - size, align); 1548 if (addr <= alloc_bottom) 1549 return 0; 1550 /* Will we bump into the RMO ? If yes, check out that we 1551 * didn't overlap existing allocations there, if we did, 1552 * we are dead, we must be the first in town ! 1553 */ 1554 if (addr < rmo_top) { 1555 /* Good, we are first */ 1556 if (alloc_top == rmo_top) 1557 alloc_top = rmo_top = addr; 1558 else 1559 return 0; 1560 } 1561 alloc_top_high = addr; 1562 goto bail; 1563 } 1564 1565 base = ALIGN_DOWN(alloc_top - size, align); 1566 for (; base > alloc_bottom; 1567 base = ALIGN_DOWN(base - 0x100000, align)) { 1568 prom_debug(" trying: 0x%lx\n\r", base); 1569 addr = (unsigned long)prom_claim(base, size, 0); 1570 if (addr != PROM_ERROR && addr != 0) 1571 break; 1572 addr = 0; 1573 } 1574 if (addr == 0) 1575 return 0; 1576 alloc_top = addr; 1577 1578 bail: 1579 prom_debug(" -> %lx\n", addr); 1580 prom_debug(" alloc_bottom : %lx\n", alloc_bottom); 1581 prom_debug(" alloc_top : %lx\n", alloc_top); 1582 prom_debug(" alloc_top_hi : %lx\n", alloc_top_high); 1583 prom_debug(" rmo_top : %lx\n", rmo_top); 1584 prom_debug(" ram_top : %lx\n", ram_top); 1585 1586 return addr; 1587 } 1588 1589 /* 1590 * Parse a "reg" cell 1591 */ 1592 static unsigned long __init prom_next_cell(int s, cell_t **cellp) 1593 { 1594 cell_t *p = *cellp; 1595 unsigned long r = 0; 1596 1597 /* Ignore more than 2 cells */ 1598 while (s > sizeof(unsigned long) / 4) { 1599 p++; 1600 s--; 1601 } 1602 r = be32_to_cpu(*p++); 1603 #ifdef CONFIG_PPC64 1604 if (s > 1) { 1605 r <<= 32; 1606 r |= be32_to_cpu(*(p++)); 1607 } 1608 #endif 1609 *cellp = p; 1610 return r; 1611 } 1612 1613 /* 1614 * Very dumb function for adding to the memory reserve list, but 1615 * we don't need anything smarter at this point 1616 * 1617 * XXX Eventually check for collisions. They should NEVER happen. 1618 * If problems seem to show up, it would be a good start to track 1619 * them down. 1620 */ 1621 static void __init reserve_mem(u64 base, u64 size) 1622 { 1623 u64 top = base + size; 1624 unsigned long cnt = mem_reserve_cnt; 1625 1626 if (size == 0) 1627 return; 1628 1629 /* We need to always keep one empty entry so that we 1630 * have our terminator with "size" set to 0 since we are 1631 * dumb and just copy this entire array to the boot params 1632 */ 1633 base = ALIGN_DOWN(base, PAGE_SIZE); 1634 top = ALIGN(top, PAGE_SIZE); 1635 size = top - base; 1636 1637 if (cnt >= (MEM_RESERVE_MAP_SIZE - 1)) 1638 prom_panic("Memory reserve map exhausted !\n"); 1639 mem_reserve_map[cnt].base = cpu_to_be64(base); 1640 mem_reserve_map[cnt].size = cpu_to_be64(size); 1641 mem_reserve_cnt = cnt + 1; 1642 } 1643 1644 /* 1645 * Initialize memory allocation mechanism, parse "memory" nodes and 1646 * obtain that way the top of memory and RMO to setup out local allocator 1647 */ 1648 static void __init prom_init_mem(void) 1649 { 1650 phandle node; 1651 char type[64]; 1652 unsigned int plen; 1653 cell_t *p, *endp; 1654 __be32 val; 1655 u32 rac, rsc; 1656 1657 /* 1658 * We iterate the memory nodes to find 1659 * 1) top of RMO (first node) 1660 * 2) top of memory 1661 */ 1662 val = cpu_to_be32(2); 1663 prom_getprop(prom.root, "#address-cells", &val, sizeof(val)); 1664 rac = be32_to_cpu(val); 1665 val = cpu_to_be32(1); 1666 prom_getprop(prom.root, "#size-cells", &val, sizeof(rsc)); 1667 rsc = be32_to_cpu(val); 1668 prom_debug("root_addr_cells: %x\n", rac); 1669 prom_debug("root_size_cells: %x\n", rsc); 1670 1671 prom_debug("scanning memory:\n"); 1672 1673 for (node = 0; prom_next_node(&node); ) { 1674 type[0] = 0; 1675 prom_getprop(node, "device_type", type, sizeof(type)); 1676 1677 if (type[0] == 0) { 1678 /* 1679 * CHRP Longtrail machines have no device_type 1680 * on the memory node, so check the name instead... 1681 */ 1682 prom_getprop(node, "name", type, sizeof(type)); 1683 } 1684 if (prom_strcmp(type, "memory")) 1685 continue; 1686 1687 plen = prom_getprop(node, "reg", regbuf, sizeof(regbuf)); 1688 if (plen > sizeof(regbuf)) { 1689 prom_printf("memory node too large for buffer !\n"); 1690 plen = sizeof(regbuf); 1691 } 1692 p = regbuf; 1693 endp = p + (plen / sizeof(cell_t)); 1694 1695 #ifdef DEBUG_PROM 1696 memset(prom_scratch, 0, sizeof(prom_scratch)); 1697 call_prom("package-to-path", 3, 1, node, prom_scratch, 1698 sizeof(prom_scratch) - 1); 1699 prom_debug(" node %s :\n", prom_scratch); 1700 #endif /* DEBUG_PROM */ 1701 1702 while ((endp - p) >= (rac + rsc)) { 1703 unsigned long base, size; 1704 1705 base = prom_next_cell(rac, &p); 1706 size = prom_next_cell(rsc, &p); 1707 1708 if (size == 0) 1709 continue; 1710 prom_debug(" %lx %lx\n", base, size); 1711 if (base == 0 && (of_platform & PLATFORM_LPAR)) 1712 rmo_top = size; 1713 if ((base + size) > ram_top) 1714 ram_top = base + size; 1715 } 1716 } 1717 1718 alloc_bottom = PAGE_ALIGN((unsigned long)&_end + 0x4000); 1719 1720 /* 1721 * If prom_memory_limit is set we reduce the upper limits *except* for 1722 * alloc_top_high. This must be the real top of RAM so we can put 1723 * TCE's up there. 1724 */ 1725 1726 alloc_top_high = ram_top; 1727 1728 if (prom_memory_limit) { 1729 if (prom_memory_limit <= alloc_bottom) { 1730 prom_printf("Ignoring mem=%lx <= alloc_bottom.\n", 1731 prom_memory_limit); 1732 prom_memory_limit = 0; 1733 } else if (prom_memory_limit >= ram_top) { 1734 prom_printf("Ignoring mem=%lx >= ram_top.\n", 1735 prom_memory_limit); 1736 prom_memory_limit = 0; 1737 } else { 1738 ram_top = prom_memory_limit; 1739 rmo_top = min(rmo_top, prom_memory_limit); 1740 } 1741 } 1742 1743 /* 1744 * Setup our top alloc point, that is top of RMO or top of 1745 * segment 0 when running non-LPAR. 1746 * Some RS64 machines have buggy firmware where claims up at 1747 * 1GB fail. Cap at 768MB as a workaround. 1748 * Since 768MB is plenty of room, and we need to cap to something 1749 * reasonable on 32-bit, cap at 768MB on all machines. 1750 */ 1751 if (!rmo_top) 1752 rmo_top = ram_top; 1753 rmo_top = min(0x30000000ul, rmo_top); 1754 alloc_top = rmo_top; 1755 alloc_top_high = ram_top; 1756 1757 /* 1758 * Check if we have an initrd after the kernel but still inside 1759 * the RMO. If we do move our bottom point to after it. 1760 */ 1761 if (prom_initrd_start && 1762 prom_initrd_start < rmo_top && 1763 prom_initrd_end > alloc_bottom) 1764 alloc_bottom = PAGE_ALIGN(prom_initrd_end); 1765 1766 prom_printf("memory layout at init:\n"); 1767 prom_printf(" memory_limit : %lx (16 MB aligned)\n", 1768 prom_memory_limit); 1769 prom_printf(" alloc_bottom : %lx\n", alloc_bottom); 1770 prom_printf(" alloc_top : %lx\n", alloc_top); 1771 prom_printf(" alloc_top_hi : %lx\n", alloc_top_high); 1772 prom_printf(" rmo_top : %lx\n", rmo_top); 1773 prom_printf(" ram_top : %lx\n", ram_top); 1774 } 1775 1776 static void __init prom_close_stdin(void) 1777 { 1778 __be32 val; 1779 ihandle stdin; 1780 1781 if (prom_getprop(prom.chosen, "stdin", &val, sizeof(val)) > 0) { 1782 stdin = be32_to_cpu(val); 1783 call_prom("close", 1, 0, stdin); 1784 } 1785 } 1786 1787 #ifdef CONFIG_PPC_SVM 1788 static int prom_rtas_hcall(uint64_t args) 1789 { 1790 register uint64_t arg1 asm("r3") = H_RTAS; 1791 register uint64_t arg2 asm("r4") = args; 1792 1793 asm volatile("sc 1\n" : "=r" (arg1) : 1794 "r" (arg1), 1795 "r" (arg2) :); 1796 srr_regs_clobbered(); 1797 1798 return arg1; 1799 } 1800 1801 static struct rtas_args __prombss os_term_args; 1802 1803 static void __init prom_rtas_os_term(char *str) 1804 { 1805 phandle rtas_node; 1806 __be32 val; 1807 u32 token; 1808 1809 prom_debug("%s: start...\n", __func__); 1810 rtas_node = call_prom("finddevice", 1, 1, ADDR("/rtas")); 1811 prom_debug("rtas_node: %x\n", rtas_node); 1812 if (!PHANDLE_VALID(rtas_node)) 1813 return; 1814 1815 val = 0; 1816 prom_getprop(rtas_node, "ibm,os-term", &val, sizeof(val)); 1817 token = be32_to_cpu(val); 1818 prom_debug("ibm,os-term: %x\n", token); 1819 if (token == 0) 1820 prom_panic("Could not get token for ibm,os-term\n"); 1821 os_term_args.token = cpu_to_be32(token); 1822 os_term_args.nargs = cpu_to_be32(1); 1823 os_term_args.nret = cpu_to_be32(1); 1824 os_term_args.args[0] = cpu_to_be32(__pa(str)); 1825 prom_rtas_hcall((uint64_t)&os_term_args); 1826 } 1827 #endif /* CONFIG_PPC_SVM */ 1828 1829 /* 1830 * Allocate room for and instantiate RTAS 1831 */ 1832 static void __init prom_instantiate_rtas(void) 1833 { 1834 phandle rtas_node; 1835 ihandle rtas_inst; 1836 u32 base, entry = 0; 1837 __be32 val; 1838 u32 size = 0; 1839 1840 prom_debug("prom_instantiate_rtas: start...\n"); 1841 1842 rtas_node = call_prom("finddevice", 1, 1, ADDR("/rtas")); 1843 prom_debug("rtas_node: %x\n", rtas_node); 1844 if (!PHANDLE_VALID(rtas_node)) 1845 return; 1846 1847 val = 0; 1848 prom_getprop(rtas_node, "rtas-size", &val, sizeof(size)); 1849 size = be32_to_cpu(val); 1850 if (size == 0) 1851 return; 1852 1853 base = alloc_down(size, PAGE_SIZE, 0); 1854 if (base == 0) 1855 prom_panic("Could not allocate memory for RTAS\n"); 1856 1857 rtas_inst = call_prom("open", 1, 1, ADDR("/rtas")); 1858 if (!IHANDLE_VALID(rtas_inst)) { 1859 prom_printf("opening rtas package failed (%x)\n", rtas_inst); 1860 return; 1861 } 1862 1863 prom_printf("instantiating rtas at 0x%x...", base); 1864 1865 if (call_prom_ret("call-method", 3, 2, &entry, 1866 ADDR("instantiate-rtas"), 1867 rtas_inst, base) != 0 1868 || entry == 0) { 1869 prom_printf(" failed\n"); 1870 return; 1871 } 1872 prom_printf(" done\n"); 1873 1874 reserve_mem(base, size); 1875 1876 val = cpu_to_be32(base); 1877 prom_setprop(rtas_node, "/rtas", "linux,rtas-base", 1878 &val, sizeof(val)); 1879 val = cpu_to_be32(entry); 1880 prom_setprop(rtas_node, "/rtas", "linux,rtas-entry", 1881 &val, sizeof(val)); 1882 1883 /* Check if it supports "query-cpu-stopped-state" */ 1884 if (prom_getprop(rtas_node, "query-cpu-stopped-state", 1885 &val, sizeof(val)) != PROM_ERROR) 1886 rtas_has_query_cpu_stopped = true; 1887 1888 prom_debug("rtas base = 0x%x\n", base); 1889 prom_debug("rtas entry = 0x%x\n", entry); 1890 prom_debug("rtas size = 0x%x\n", size); 1891 1892 prom_debug("prom_instantiate_rtas: end...\n"); 1893 } 1894 1895 #ifdef CONFIG_PPC64 1896 /* 1897 * Allocate room for and instantiate Stored Measurement Log (SML) 1898 */ 1899 static void __init prom_instantiate_sml(void) 1900 { 1901 phandle ibmvtpm_node; 1902 ihandle ibmvtpm_inst; 1903 u32 entry = 0, size = 0, succ = 0; 1904 u64 base; 1905 __be32 val; 1906 1907 prom_debug("prom_instantiate_sml: start...\n"); 1908 1909 ibmvtpm_node = call_prom("finddevice", 1, 1, ADDR("/vdevice/vtpm")); 1910 prom_debug("ibmvtpm_node: %x\n", ibmvtpm_node); 1911 if (!PHANDLE_VALID(ibmvtpm_node)) 1912 return; 1913 1914 ibmvtpm_inst = call_prom("open", 1, 1, ADDR("/vdevice/vtpm")); 1915 if (!IHANDLE_VALID(ibmvtpm_inst)) { 1916 prom_printf("opening vtpm package failed (%x)\n", ibmvtpm_inst); 1917 return; 1918 } 1919 1920 if (prom_getprop(ibmvtpm_node, "ibm,sml-efi-reformat-supported", 1921 &val, sizeof(val)) != PROM_ERROR) { 1922 if (call_prom_ret("call-method", 2, 2, &succ, 1923 ADDR("reformat-sml-to-efi-alignment"), 1924 ibmvtpm_inst) != 0 || succ == 0) { 1925 prom_printf("Reformat SML to EFI alignment failed\n"); 1926 return; 1927 } 1928 1929 if (call_prom_ret("call-method", 2, 2, &size, 1930 ADDR("sml-get-allocated-size"), 1931 ibmvtpm_inst) != 0 || size == 0) { 1932 prom_printf("SML get allocated size failed\n"); 1933 return; 1934 } 1935 } else { 1936 if (call_prom_ret("call-method", 2, 2, &size, 1937 ADDR("sml-get-handover-size"), 1938 ibmvtpm_inst) != 0 || size == 0) { 1939 prom_printf("SML get handover size failed\n"); 1940 return; 1941 } 1942 } 1943 1944 base = alloc_down(size, PAGE_SIZE, 0); 1945 if (base == 0) 1946 prom_panic("Could not allocate memory for sml\n"); 1947 1948 prom_printf("instantiating sml at 0x%llx...", base); 1949 1950 memset((void *)base, 0, size); 1951 1952 if (call_prom_ret("call-method", 4, 2, &entry, 1953 ADDR("sml-handover"), 1954 ibmvtpm_inst, size, base) != 0 || entry == 0) { 1955 prom_printf("SML handover failed\n"); 1956 return; 1957 } 1958 prom_printf(" done\n"); 1959 1960 reserve_mem(base, size); 1961 1962 prom_setprop(ibmvtpm_node, "/vdevice/vtpm", "linux,sml-base", 1963 &base, sizeof(base)); 1964 prom_setprop(ibmvtpm_node, "/vdevice/vtpm", "linux,sml-size", 1965 &size, sizeof(size)); 1966 1967 prom_debug("sml base = 0x%llx\n", base); 1968 prom_debug("sml size = 0x%x\n", size); 1969 1970 prom_debug("prom_instantiate_sml: end...\n"); 1971 } 1972 1973 /* 1974 * Allocate room for and initialize TCE tables 1975 */ 1976 #ifdef __BIG_ENDIAN__ 1977 static void __init prom_initialize_tce_table(void) 1978 { 1979 phandle node; 1980 ihandle phb_node; 1981 char compatible[64], type[64], model[64]; 1982 char *path = prom_scratch; 1983 u64 base, align; 1984 u32 minalign, minsize; 1985 u64 tce_entry, *tce_entryp; 1986 u64 local_alloc_top, local_alloc_bottom; 1987 u64 i; 1988 1989 if (prom_iommu_off) 1990 return; 1991 1992 prom_debug("starting prom_initialize_tce_table\n"); 1993 1994 /* Cache current top of allocs so we reserve a single block */ 1995 local_alloc_top = alloc_top_high; 1996 local_alloc_bottom = local_alloc_top; 1997 1998 /* Search all nodes looking for PHBs. */ 1999 for (node = 0; prom_next_node(&node); ) { 2000 compatible[0] = 0; 2001 type[0] = 0; 2002 model[0] = 0; 2003 prom_getprop(node, "compatible", 2004 compatible, sizeof(compatible)); 2005 prom_getprop(node, "device_type", type, sizeof(type)); 2006 prom_getprop(node, "model", model, sizeof(model)); 2007 2008 if ((type[0] == 0) || (prom_strstr(type, "pci") == NULL)) 2009 continue; 2010 2011 /* Keep the old logic intact to avoid regression. */ 2012 if (compatible[0] != 0) { 2013 if ((prom_strstr(compatible, "python") == NULL) && 2014 (prom_strstr(compatible, "Speedwagon") == NULL) && 2015 (prom_strstr(compatible, "Winnipeg") == NULL)) 2016 continue; 2017 } else if (model[0] != 0) { 2018 if ((prom_strstr(model, "ython") == NULL) && 2019 (prom_strstr(model, "peedwagon") == NULL) && 2020 (prom_strstr(model, "innipeg") == NULL)) 2021 continue; 2022 } 2023 2024 if (prom_getprop(node, "tce-table-minalign", &minalign, 2025 sizeof(minalign)) == PROM_ERROR) 2026 minalign = 0; 2027 if (prom_getprop(node, "tce-table-minsize", &minsize, 2028 sizeof(minsize)) == PROM_ERROR) 2029 minsize = 4UL << 20; 2030 2031 /* 2032 * Even though we read what OF wants, we just set the table 2033 * size to 4 MB. This is enough to map 2GB of PCI DMA space. 2034 * By doing this, we avoid the pitfalls of trying to DMA to 2035 * MMIO space and the DMA alias hole. 2036 */ 2037 minsize = 4UL << 20; 2038 2039 /* Align to the greater of the align or size */ 2040 align = max(minalign, minsize); 2041 base = alloc_down(minsize, align, 1); 2042 if (base == 0) 2043 prom_panic("ERROR, cannot find space for TCE table.\n"); 2044 if (base < local_alloc_bottom) 2045 local_alloc_bottom = base; 2046 2047 /* It seems OF doesn't null-terminate the path :-( */ 2048 memset(path, 0, sizeof(prom_scratch)); 2049 /* Call OF to setup the TCE hardware */ 2050 if (call_prom("package-to-path", 3, 1, node, 2051 path, sizeof(prom_scratch) - 1) == PROM_ERROR) { 2052 prom_printf("package-to-path failed\n"); 2053 } 2054 2055 /* Save away the TCE table attributes for later use. */ 2056 prom_setprop(node, path, "linux,tce-base", &base, sizeof(base)); 2057 prom_setprop(node, path, "linux,tce-size", &minsize, sizeof(minsize)); 2058 2059 prom_debug("TCE table: %s\n", path); 2060 prom_debug("\tnode = 0x%x\n", node); 2061 prom_debug("\tbase = 0x%llx\n", base); 2062 prom_debug("\tsize = 0x%x\n", minsize); 2063 2064 /* Initialize the table to have a one-to-one mapping 2065 * over the allocated size. 2066 */ 2067 tce_entryp = (u64 *)base; 2068 for (i = 0; i < (minsize >> 3) ;tce_entryp++, i++) { 2069 tce_entry = (i << PAGE_SHIFT); 2070 tce_entry |= 0x3; 2071 *tce_entryp = tce_entry; 2072 } 2073 2074 prom_printf("opening PHB %s", path); 2075 phb_node = call_prom("open", 1, 1, path); 2076 if (phb_node == 0) 2077 prom_printf("... failed\n"); 2078 else 2079 prom_printf("... done\n"); 2080 2081 call_prom("call-method", 6, 0, ADDR("set-64-bit-addressing"), 2082 phb_node, -1, minsize, 2083 (u32) base, (u32) (base >> 32)); 2084 call_prom("close", 1, 0, phb_node); 2085 } 2086 2087 reserve_mem(local_alloc_bottom, local_alloc_top - local_alloc_bottom); 2088 2089 /* These are only really needed if there is a memory limit in 2090 * effect, but we don't know so export them always. */ 2091 prom_tce_alloc_start = local_alloc_bottom; 2092 prom_tce_alloc_end = local_alloc_top; 2093 2094 /* Flag the first invalid entry */ 2095 prom_debug("ending prom_initialize_tce_table\n"); 2096 } 2097 #endif /* __BIG_ENDIAN__ */ 2098 #endif /* CONFIG_PPC64 */ 2099 2100 /* 2101 * With CHRP SMP we need to use the OF to start the other processors. 2102 * We can't wait until smp_boot_cpus (the OF is trashed by then) 2103 * so we have to put the processors into a holding pattern controlled 2104 * by the kernel (not OF) before we destroy the OF. 2105 * 2106 * This uses a chunk of low memory, puts some holding pattern 2107 * code there and sends the other processors off to there until 2108 * smp_boot_cpus tells them to do something. The holding pattern 2109 * checks that address until its cpu # is there, when it is that 2110 * cpu jumps to __secondary_start(). smp_boot_cpus() takes care 2111 * of setting those values. 2112 * 2113 * We also use physical address 0x4 here to tell when a cpu 2114 * is in its holding pattern code. 2115 * 2116 * -- Cort 2117 */ 2118 /* 2119 * We want to reference the copy of __secondary_hold_* in the 2120 * 0 - 0x100 address range 2121 */ 2122 #define LOW_ADDR(x) (((unsigned long) &(x)) & 0xff) 2123 2124 static void __init prom_hold_cpus(void) 2125 { 2126 unsigned long i; 2127 phandle node; 2128 char type[64]; 2129 unsigned long *spinloop 2130 = (void *) LOW_ADDR(__secondary_hold_spinloop); 2131 unsigned long *acknowledge 2132 = (void *) LOW_ADDR(__secondary_hold_acknowledge); 2133 unsigned long secondary_hold = LOW_ADDR(__secondary_hold); 2134 2135 /* 2136 * On pseries, if RTAS supports "query-cpu-stopped-state", 2137 * we skip this stage, the CPUs will be started by the 2138 * kernel using RTAS. 2139 */ 2140 if ((of_platform == PLATFORM_PSERIES || 2141 of_platform == PLATFORM_PSERIES_LPAR) && 2142 rtas_has_query_cpu_stopped) { 2143 prom_printf("prom_hold_cpus: skipped\n"); 2144 return; 2145 } 2146 2147 prom_debug("prom_hold_cpus: start...\n"); 2148 prom_debug(" 1) spinloop = 0x%lx\n", (unsigned long)spinloop); 2149 prom_debug(" 1) *spinloop = 0x%lx\n", *spinloop); 2150 prom_debug(" 1) acknowledge = 0x%lx\n", 2151 (unsigned long)acknowledge); 2152 prom_debug(" 1) *acknowledge = 0x%lx\n", *acknowledge); 2153 prom_debug(" 1) secondary_hold = 0x%lx\n", secondary_hold); 2154 2155 /* Set the common spinloop variable, so all of the secondary cpus 2156 * will block when they are awakened from their OF spinloop. 2157 * This must occur for both SMP and non SMP kernels, since OF will 2158 * be trashed when we move the kernel. 2159 */ 2160 *spinloop = 0; 2161 2162 /* look for cpus */ 2163 for (node = 0; prom_next_node(&node); ) { 2164 unsigned int cpu_no; 2165 __be32 reg; 2166 2167 type[0] = 0; 2168 prom_getprop(node, "device_type", type, sizeof(type)); 2169 if (prom_strcmp(type, "cpu") != 0) 2170 continue; 2171 2172 /* Skip non-configured cpus. */ 2173 if (prom_getprop(node, "status", type, sizeof(type)) > 0) 2174 if (prom_strcmp(type, "okay") != 0) 2175 continue; 2176 2177 reg = cpu_to_be32(-1); /* make sparse happy */ 2178 prom_getprop(node, "reg", ®, sizeof(reg)); 2179 cpu_no = be32_to_cpu(reg); 2180 2181 prom_debug("cpu hw idx = %u\n", cpu_no); 2182 2183 /* Init the acknowledge var which will be reset by 2184 * the secondary cpu when it awakens from its OF 2185 * spinloop. 2186 */ 2187 *acknowledge = (unsigned long)-1; 2188 2189 if (cpu_no != prom.cpu) { 2190 /* Primary Thread of non-boot cpu or any thread */ 2191 prom_printf("starting cpu hw idx %u... ", cpu_no); 2192 call_prom("start-cpu", 3, 0, node, 2193 secondary_hold, cpu_no); 2194 2195 for (i = 0; (i < 100000000) && 2196 (*acknowledge == ((unsigned long)-1)); i++ ) 2197 mb(); 2198 2199 if (*acknowledge == cpu_no) 2200 prom_printf("done\n"); 2201 else 2202 prom_printf("failed: %lx\n", *acknowledge); 2203 } 2204 #ifdef CONFIG_SMP 2205 else 2206 prom_printf("boot cpu hw idx %u\n", cpu_no); 2207 #endif /* CONFIG_SMP */ 2208 } 2209 2210 prom_debug("prom_hold_cpus: end...\n"); 2211 } 2212 2213 2214 static void __init prom_init_client_services(unsigned long pp) 2215 { 2216 /* Get a handle to the prom entry point before anything else */ 2217 prom_entry = pp; 2218 2219 /* get a handle for the stdout device */ 2220 prom.chosen = call_prom("finddevice", 1, 1, ADDR("/chosen")); 2221 if (!PHANDLE_VALID(prom.chosen)) 2222 prom_panic("cannot find chosen"); /* msg won't be printed :( */ 2223 2224 /* get device tree root */ 2225 prom.root = call_prom("finddevice", 1, 1, ADDR("/")); 2226 if (!PHANDLE_VALID(prom.root)) 2227 prom_panic("cannot find device tree root"); /* msg won't be printed :( */ 2228 2229 prom.mmumap = 0; 2230 } 2231 2232 #ifdef CONFIG_PPC32 2233 /* 2234 * For really old powermacs, we need to map things we claim. 2235 * For that, we need the ihandle of the mmu. 2236 * Also, on the longtrail, we need to work around other bugs. 2237 */ 2238 static void __init prom_find_mmu(void) 2239 { 2240 phandle oprom; 2241 char version[64]; 2242 2243 oprom = call_prom("finddevice", 1, 1, ADDR("/openprom")); 2244 if (!PHANDLE_VALID(oprom)) 2245 return; 2246 if (prom_getprop(oprom, "model", version, sizeof(version)) <= 0) 2247 return; 2248 version[sizeof(version) - 1] = 0; 2249 /* XXX might need to add other versions here */ 2250 if (prom_strcmp(version, "Open Firmware, 1.0.5") == 0) 2251 of_workarounds = OF_WA_CLAIM; 2252 else if (prom_strncmp(version, "FirmWorks,3.", 12) == 0) { 2253 of_workarounds = OF_WA_CLAIM | OF_WA_LONGTRAIL; 2254 call_prom("interpret", 1, 1, "dev /memory 0 to allow-reclaim"); 2255 } else 2256 return; 2257 prom.memory = call_prom("open", 1, 1, ADDR("/memory")); 2258 prom_getprop(prom.chosen, "mmu", &prom.mmumap, 2259 sizeof(prom.mmumap)); 2260 prom.mmumap = be32_to_cpu(prom.mmumap); 2261 if (!IHANDLE_VALID(prom.memory) || !IHANDLE_VALID(prom.mmumap)) 2262 of_workarounds &= ~OF_WA_CLAIM; /* hmmm */ 2263 } 2264 #else 2265 #define prom_find_mmu() 2266 #endif 2267 2268 static void __init prom_init_stdout(void) 2269 { 2270 char *path = of_stdout_device; 2271 char type[16]; 2272 phandle stdout_node; 2273 __be32 val; 2274 2275 if (prom_getprop(prom.chosen, "stdout", &val, sizeof(val)) <= 0) 2276 prom_panic("cannot find stdout"); 2277 2278 prom.stdout = be32_to_cpu(val); 2279 2280 /* Get the full OF pathname of the stdout device */ 2281 memset(path, 0, 256); 2282 call_prom("instance-to-path", 3, 1, prom.stdout, path, 255); 2283 prom_printf("OF stdout device is: %s\n", of_stdout_device); 2284 prom_setprop(prom.chosen, "/chosen", "linux,stdout-path", 2285 path, prom_strlen(path) + 1); 2286 2287 /* instance-to-package fails on PA-Semi */ 2288 stdout_node = call_prom("instance-to-package", 1, 1, prom.stdout); 2289 if (stdout_node != PROM_ERROR) { 2290 val = cpu_to_be32(stdout_node); 2291 2292 /* If it's a display, note it */ 2293 memset(type, 0, sizeof(type)); 2294 prom_getprop(stdout_node, "device_type", type, sizeof(type)); 2295 if (prom_strcmp(type, "display") == 0) 2296 prom_setprop(stdout_node, path, "linux,boot-display", NULL, 0); 2297 } 2298 } 2299 2300 static int __init prom_find_machine_type(void) 2301 { 2302 char compat[256]; 2303 int len, i = 0; 2304 #ifdef CONFIG_PPC64 2305 phandle rtas; 2306 int x; 2307 #endif 2308 2309 /* Look for a PowerMac or a Cell */ 2310 len = prom_getprop(prom.root, "compatible", 2311 compat, sizeof(compat)-1); 2312 if (len > 0) { 2313 compat[len] = 0; 2314 while (i < len) { 2315 char *p = &compat[i]; 2316 int sl = prom_strlen(p); 2317 if (sl == 0) 2318 break; 2319 if (prom_strstr(p, "Power Macintosh") || 2320 prom_strstr(p, "MacRISC")) 2321 return PLATFORM_POWERMAC; 2322 #ifdef CONFIG_PPC64 2323 /* We must make sure we don't detect the IBM Cell 2324 * blades as pSeries due to some firmware issues, 2325 * so we do it here. 2326 */ 2327 if (prom_strstr(p, "IBM,CBEA") || 2328 prom_strstr(p, "IBM,CPBW-1.0")) 2329 return PLATFORM_GENERIC; 2330 #endif /* CONFIG_PPC64 */ 2331 i += sl + 1; 2332 } 2333 } 2334 #ifdef CONFIG_PPC64 2335 /* Try to figure out if it's an IBM pSeries or any other 2336 * PAPR compliant platform. We assume it is if : 2337 * - /device_type is "chrp" (please, do NOT use that for future 2338 * non-IBM designs ! 2339 * - it has /rtas 2340 */ 2341 len = prom_getprop(prom.root, "device_type", 2342 compat, sizeof(compat)-1); 2343 if (len <= 0) 2344 return PLATFORM_GENERIC; 2345 if (prom_strcmp(compat, "chrp")) 2346 return PLATFORM_GENERIC; 2347 2348 /* Default to pSeries. We need to know if we are running LPAR */ 2349 rtas = call_prom("finddevice", 1, 1, ADDR("/rtas")); 2350 if (!PHANDLE_VALID(rtas)) 2351 return PLATFORM_GENERIC; 2352 x = prom_getproplen(rtas, "ibm,hypertas-functions"); 2353 if (x != PROM_ERROR) { 2354 prom_debug("Hypertas detected, assuming LPAR !\n"); 2355 return PLATFORM_PSERIES_LPAR; 2356 } 2357 return PLATFORM_PSERIES; 2358 #else 2359 return PLATFORM_GENERIC; 2360 #endif 2361 } 2362 2363 static int __init prom_set_color(ihandle ih, int i, int r, int g, int b) 2364 { 2365 return call_prom("call-method", 6, 1, ADDR("color!"), ih, i, b, g, r); 2366 } 2367 2368 /* 2369 * If we have a display that we don't know how to drive, 2370 * we will want to try to execute OF's open method for it 2371 * later. However, OF will probably fall over if we do that 2372 * we've taken over the MMU. 2373 * So we check whether we will need to open the display, 2374 * and if so, open it now. 2375 */ 2376 static void __init prom_check_displays(void) 2377 { 2378 char type[16], *path; 2379 phandle node; 2380 ihandle ih; 2381 int i; 2382 2383 static const unsigned char default_colors[] __initconst = { 2384 0x00, 0x00, 0x00, 2385 0x00, 0x00, 0xaa, 2386 0x00, 0xaa, 0x00, 2387 0x00, 0xaa, 0xaa, 2388 0xaa, 0x00, 0x00, 2389 0xaa, 0x00, 0xaa, 2390 0xaa, 0xaa, 0x00, 2391 0xaa, 0xaa, 0xaa, 2392 0x55, 0x55, 0x55, 2393 0x55, 0x55, 0xff, 2394 0x55, 0xff, 0x55, 2395 0x55, 0xff, 0xff, 2396 0xff, 0x55, 0x55, 2397 0xff, 0x55, 0xff, 2398 0xff, 0xff, 0x55, 2399 0xff, 0xff, 0xff 2400 }; 2401 const unsigned char *clut; 2402 2403 prom_debug("Looking for displays\n"); 2404 for (node = 0; prom_next_node(&node); ) { 2405 memset(type, 0, sizeof(type)); 2406 prom_getprop(node, "device_type", type, sizeof(type)); 2407 if (prom_strcmp(type, "display") != 0) 2408 continue; 2409 2410 /* It seems OF doesn't null-terminate the path :-( */ 2411 path = prom_scratch; 2412 memset(path, 0, sizeof(prom_scratch)); 2413 2414 /* 2415 * leave some room at the end of the path for appending extra 2416 * arguments 2417 */ 2418 if (call_prom("package-to-path", 3, 1, node, path, 2419 sizeof(prom_scratch) - 10) == PROM_ERROR) 2420 continue; 2421 prom_printf("found display : %s, opening... ", path); 2422 2423 ih = call_prom("open", 1, 1, path); 2424 if (ih == 0) { 2425 prom_printf("failed\n"); 2426 continue; 2427 } 2428 2429 /* Success */ 2430 prom_printf("done\n"); 2431 prom_setprop(node, path, "linux,opened", NULL, 0); 2432 2433 /* Setup a usable color table when the appropriate 2434 * method is available. Should update this to set-colors */ 2435 clut = default_colors; 2436 for (i = 0; i < 16; i++, clut += 3) 2437 if (prom_set_color(ih, i, clut[0], clut[1], 2438 clut[2]) != 0) 2439 break; 2440 2441 #ifdef CONFIG_LOGO_LINUX_CLUT224 2442 clut = PTRRELOC(logo_linux_clut224.clut); 2443 for (i = 0; i < logo_linux_clut224.clutsize; i++, clut += 3) 2444 if (prom_set_color(ih, i + 32, clut[0], clut[1], 2445 clut[2]) != 0) 2446 break; 2447 #endif /* CONFIG_LOGO_LINUX_CLUT224 */ 2448 2449 #ifdef CONFIG_PPC_EARLY_DEBUG_BOOTX 2450 if (prom_getprop(node, "linux,boot-display", NULL, 0) != 2451 PROM_ERROR) { 2452 u32 width, height, pitch, addr; 2453 2454 prom_printf("Setting btext !\n"); 2455 2456 if (prom_getprop(node, "width", &width, 4) == PROM_ERROR) 2457 return; 2458 2459 if (prom_getprop(node, "height", &height, 4) == PROM_ERROR) 2460 return; 2461 2462 if (prom_getprop(node, "linebytes", &pitch, 4) == PROM_ERROR) 2463 return; 2464 2465 if (prom_getprop(node, "address", &addr, 4) == PROM_ERROR) 2466 return; 2467 2468 prom_printf("W=%d H=%d LB=%d addr=0x%x\n", 2469 width, height, pitch, addr); 2470 btext_setup_display(width, height, 8, pitch, addr); 2471 btext_prepare_BAT(); 2472 } 2473 #endif /* CONFIG_PPC_EARLY_DEBUG_BOOTX */ 2474 } 2475 } 2476 2477 2478 /* Return (relocated) pointer to this much memory: moves initrd if reqd. */ 2479 static void __init *make_room(unsigned long *mem_start, unsigned long *mem_end, 2480 unsigned long needed, unsigned long align) 2481 { 2482 void *ret; 2483 2484 *mem_start = ALIGN(*mem_start, align); 2485 while ((*mem_start + needed) > *mem_end) { 2486 unsigned long room, chunk; 2487 2488 prom_debug("Chunk exhausted, claiming more at %lx...\n", 2489 alloc_bottom); 2490 room = alloc_top - alloc_bottom; 2491 if (room > DEVTREE_CHUNK_SIZE) 2492 room = DEVTREE_CHUNK_SIZE; 2493 if (room < PAGE_SIZE) 2494 prom_panic("No memory for flatten_device_tree " 2495 "(no room)\n"); 2496 chunk = alloc_up(room, 0); 2497 if (chunk == 0) 2498 prom_panic("No memory for flatten_device_tree " 2499 "(claim failed)\n"); 2500 *mem_end = chunk + room; 2501 } 2502 2503 ret = (void *)*mem_start; 2504 *mem_start += needed; 2505 2506 return ret; 2507 } 2508 2509 #define dt_push_token(token, mem_start, mem_end) do { \ 2510 void *room = make_room(mem_start, mem_end, 4, 4); \ 2511 *(__be32 *)room = cpu_to_be32(token); \ 2512 } while(0) 2513 2514 static unsigned long __init dt_find_string(char *str) 2515 { 2516 char *s, *os; 2517 2518 s = os = (char *)dt_string_start; 2519 s += 4; 2520 while (s < (char *)dt_string_end) { 2521 if (prom_strcmp(s, str) == 0) 2522 return s - os; 2523 s += prom_strlen(s) + 1; 2524 } 2525 return 0; 2526 } 2527 2528 /* 2529 * The Open Firmware 1275 specification states properties must be 31 bytes or 2530 * less, however not all firmwares obey this. Make it 64 bytes to be safe. 2531 */ 2532 #define MAX_PROPERTY_NAME 64 2533 2534 static void __init scan_dt_build_strings(phandle node, 2535 unsigned long *mem_start, 2536 unsigned long *mem_end) 2537 { 2538 char *prev_name, *namep, *sstart; 2539 unsigned long soff; 2540 phandle child; 2541 2542 sstart = (char *)dt_string_start; 2543 2544 /* get and store all property names */ 2545 prev_name = ""; 2546 for (;;) { 2547 /* 64 is max len of name including nul. */ 2548 namep = make_room(mem_start, mem_end, MAX_PROPERTY_NAME, 1); 2549 if (call_prom("nextprop", 3, 1, node, prev_name, namep) != 1) { 2550 /* No more nodes: unwind alloc */ 2551 *mem_start = (unsigned long)namep; 2552 break; 2553 } 2554 2555 /* skip "name" */ 2556 if (prom_strcmp(namep, "name") == 0) { 2557 *mem_start = (unsigned long)namep; 2558 prev_name = "name"; 2559 continue; 2560 } 2561 /* get/create string entry */ 2562 soff = dt_find_string(namep); 2563 if (soff != 0) { 2564 *mem_start = (unsigned long)namep; 2565 namep = sstart + soff; 2566 } else { 2567 /* Trim off some if we can */ 2568 *mem_start = (unsigned long)namep + prom_strlen(namep) + 1; 2569 dt_string_end = *mem_start; 2570 } 2571 prev_name = namep; 2572 } 2573 2574 /* do all our children */ 2575 child = call_prom("child", 1, 1, node); 2576 while (child != 0) { 2577 scan_dt_build_strings(child, mem_start, mem_end); 2578 child = call_prom("peer", 1, 1, child); 2579 } 2580 } 2581 2582 static void __init scan_dt_build_struct(phandle node, unsigned long *mem_start, 2583 unsigned long *mem_end) 2584 { 2585 phandle child; 2586 char *namep, *prev_name, *sstart, *p, *ep, *lp, *path; 2587 unsigned long soff; 2588 unsigned char *valp; 2589 static char pname[MAX_PROPERTY_NAME] __prombss; 2590 int l, room, has_phandle = 0; 2591 2592 dt_push_token(OF_DT_BEGIN_NODE, mem_start, mem_end); 2593 2594 /* get the node's full name */ 2595 namep = (char *)*mem_start; 2596 room = *mem_end - *mem_start; 2597 if (room > 255) 2598 room = 255; 2599 l = call_prom("package-to-path", 3, 1, node, namep, room); 2600 if (l >= 0) { 2601 /* Didn't fit? Get more room. */ 2602 if (l >= room) { 2603 if (l >= *mem_end - *mem_start) 2604 namep = make_room(mem_start, mem_end, l+1, 1); 2605 call_prom("package-to-path", 3, 1, node, namep, l); 2606 } 2607 namep[l] = '\0'; 2608 2609 /* Fixup an Apple bug where they have bogus \0 chars in the 2610 * middle of the path in some properties, and extract 2611 * the unit name (everything after the last '/'). 2612 */ 2613 for (lp = p = namep, ep = namep + l; p < ep; p++) { 2614 if (*p == '/') 2615 lp = namep; 2616 else if (*p != 0) 2617 *lp++ = *p; 2618 } 2619 *lp = 0; 2620 *mem_start = ALIGN((unsigned long)lp + 1, 4); 2621 } 2622 2623 /* get it again for debugging */ 2624 path = prom_scratch; 2625 memset(path, 0, sizeof(prom_scratch)); 2626 call_prom("package-to-path", 3, 1, node, path, sizeof(prom_scratch) - 1); 2627 2628 /* get and store all properties */ 2629 prev_name = ""; 2630 sstart = (char *)dt_string_start; 2631 for (;;) { 2632 if (call_prom("nextprop", 3, 1, node, prev_name, 2633 pname) != 1) 2634 break; 2635 2636 /* skip "name" */ 2637 if (prom_strcmp(pname, "name") == 0) { 2638 prev_name = "name"; 2639 continue; 2640 } 2641 2642 /* find string offset */ 2643 soff = dt_find_string(pname); 2644 if (soff == 0) { 2645 prom_printf("WARNING: Can't find string index for" 2646 " <%s>, node %s\n", pname, path); 2647 break; 2648 } 2649 prev_name = sstart + soff; 2650 2651 /* get length */ 2652 l = call_prom("getproplen", 2, 1, node, pname); 2653 2654 /* sanity checks */ 2655 if (l == PROM_ERROR) 2656 continue; 2657 2658 /* push property head */ 2659 dt_push_token(OF_DT_PROP, mem_start, mem_end); 2660 dt_push_token(l, mem_start, mem_end); 2661 dt_push_token(soff, mem_start, mem_end); 2662 2663 /* push property content */ 2664 valp = make_room(mem_start, mem_end, l, 4); 2665 call_prom("getprop", 4, 1, node, pname, valp, l); 2666 *mem_start = ALIGN(*mem_start, 4); 2667 2668 if (!prom_strcmp(pname, "phandle")) 2669 has_phandle = 1; 2670 } 2671 2672 /* Add a "phandle" property if none already exist */ 2673 if (!has_phandle) { 2674 soff = dt_find_string("phandle"); 2675 if (soff == 0) 2676 prom_printf("WARNING: Can't find string index for <phandle> node %s\n", path); 2677 else { 2678 dt_push_token(OF_DT_PROP, mem_start, mem_end); 2679 dt_push_token(4, mem_start, mem_end); 2680 dt_push_token(soff, mem_start, mem_end); 2681 valp = make_room(mem_start, mem_end, 4, 4); 2682 *(__be32 *)valp = cpu_to_be32(node); 2683 } 2684 } 2685 2686 /* do all our children */ 2687 child = call_prom("child", 1, 1, node); 2688 while (child != 0) { 2689 scan_dt_build_struct(child, mem_start, mem_end); 2690 child = call_prom("peer", 1, 1, child); 2691 } 2692 2693 dt_push_token(OF_DT_END_NODE, mem_start, mem_end); 2694 } 2695 2696 static void __init flatten_device_tree(void) 2697 { 2698 phandle root; 2699 unsigned long mem_start, mem_end, room; 2700 struct boot_param_header *hdr; 2701 char *namep; 2702 u64 *rsvmap; 2703 2704 /* 2705 * Check how much room we have between alloc top & bottom (+/- a 2706 * few pages), crop to 1MB, as this is our "chunk" size 2707 */ 2708 room = alloc_top - alloc_bottom - 0x4000; 2709 if (room > DEVTREE_CHUNK_SIZE) 2710 room = DEVTREE_CHUNK_SIZE; 2711 prom_debug("starting device tree allocs at %lx\n", alloc_bottom); 2712 2713 /* Now try to claim that */ 2714 mem_start = (unsigned long)alloc_up(room, PAGE_SIZE); 2715 if (mem_start == 0) 2716 prom_panic("Can't allocate initial device-tree chunk\n"); 2717 mem_end = mem_start + room; 2718 2719 /* Get root of tree */ 2720 root = call_prom("peer", 1, 1, (phandle)0); 2721 if (root == (phandle)0) 2722 prom_panic ("couldn't get device tree root\n"); 2723 2724 /* Build header and make room for mem rsv map */ 2725 mem_start = ALIGN(mem_start, 4); 2726 hdr = make_room(&mem_start, &mem_end, 2727 sizeof(struct boot_param_header), 4); 2728 dt_header_start = (unsigned long)hdr; 2729 rsvmap = make_room(&mem_start, &mem_end, sizeof(mem_reserve_map), 8); 2730 2731 /* Start of strings */ 2732 mem_start = PAGE_ALIGN(mem_start); 2733 dt_string_start = mem_start; 2734 mem_start += 4; /* hole */ 2735 2736 /* Add "phandle" in there, we'll need it */ 2737 namep = make_room(&mem_start, &mem_end, 16, 1); 2738 prom_strscpy_pad(namep, "phandle", sizeof("phandle")); 2739 mem_start = (unsigned long)namep + prom_strlen(namep) + 1; 2740 2741 /* Build string array */ 2742 prom_printf("Building dt strings...\n"); 2743 scan_dt_build_strings(root, &mem_start, &mem_end); 2744 dt_string_end = mem_start; 2745 2746 /* Build structure */ 2747 mem_start = PAGE_ALIGN(mem_start); 2748 dt_struct_start = mem_start; 2749 prom_printf("Building dt structure...\n"); 2750 scan_dt_build_struct(root, &mem_start, &mem_end); 2751 dt_push_token(OF_DT_END, &mem_start, &mem_end); 2752 dt_struct_end = PAGE_ALIGN(mem_start); 2753 2754 /* Finish header */ 2755 hdr->boot_cpuid_phys = cpu_to_be32(prom.cpu); 2756 hdr->magic = cpu_to_be32(OF_DT_HEADER); 2757 hdr->totalsize = cpu_to_be32(dt_struct_end - dt_header_start); 2758 hdr->off_dt_struct = cpu_to_be32(dt_struct_start - dt_header_start); 2759 hdr->off_dt_strings = cpu_to_be32(dt_string_start - dt_header_start); 2760 hdr->dt_strings_size = cpu_to_be32(dt_string_end - dt_string_start); 2761 hdr->off_mem_rsvmap = cpu_to_be32(((unsigned long)rsvmap) - dt_header_start); 2762 hdr->version = cpu_to_be32(OF_DT_VERSION); 2763 /* Version 16 is not backward compatible */ 2764 hdr->last_comp_version = cpu_to_be32(0x10); 2765 2766 /* Copy the reserve map in */ 2767 memcpy(rsvmap, mem_reserve_map, sizeof(mem_reserve_map)); 2768 2769 #ifdef DEBUG_PROM 2770 { 2771 int i; 2772 prom_printf("reserved memory map:\n"); 2773 for (i = 0; i < mem_reserve_cnt; i++) 2774 prom_printf(" %llx - %llx\n", 2775 be64_to_cpu(mem_reserve_map[i].base), 2776 be64_to_cpu(mem_reserve_map[i].size)); 2777 } 2778 #endif 2779 /* Bump mem_reserve_cnt to cause further reservations to fail 2780 * since it's too late. 2781 */ 2782 mem_reserve_cnt = MEM_RESERVE_MAP_SIZE; 2783 2784 prom_printf("Device tree strings 0x%lx -> 0x%lx\n", 2785 dt_string_start, dt_string_end); 2786 prom_printf("Device tree struct 0x%lx -> 0x%lx\n", 2787 dt_struct_start, dt_struct_end); 2788 } 2789 2790 #ifdef CONFIG_PPC_MAPLE 2791 /* PIBS Version 1.05.0000 04/26/2005 has an incorrect /ht/isa/ranges property. 2792 * The values are bad, and it doesn't even have the right number of cells. */ 2793 static void __init fixup_device_tree_maple(void) 2794 { 2795 phandle isa; 2796 u32 rloc = 0x01002000; /* IO space; PCI device = 4 */ 2797 u32 isa_ranges[6]; 2798 char *name; 2799 2800 name = "/ht@0/isa@4"; 2801 isa = call_prom("finddevice", 1, 1, ADDR(name)); 2802 if (!PHANDLE_VALID(isa)) { 2803 name = "/ht@0/isa@6"; 2804 isa = call_prom("finddevice", 1, 1, ADDR(name)); 2805 rloc = 0x01003000; /* IO space; PCI device = 6 */ 2806 } 2807 if (!PHANDLE_VALID(isa)) 2808 return; 2809 2810 if (prom_getproplen(isa, "ranges") != 12) 2811 return; 2812 if (prom_getprop(isa, "ranges", isa_ranges, sizeof(isa_ranges)) 2813 == PROM_ERROR) 2814 return; 2815 2816 if (isa_ranges[0] != 0x1 || 2817 isa_ranges[1] != 0xf4000000 || 2818 isa_ranges[2] != 0x00010000) 2819 return; 2820 2821 prom_printf("Fixing up bogus ISA range on Maple/Apache...\n"); 2822 2823 isa_ranges[0] = 0x1; 2824 isa_ranges[1] = 0x0; 2825 isa_ranges[2] = rloc; 2826 isa_ranges[3] = 0x0; 2827 isa_ranges[4] = 0x0; 2828 isa_ranges[5] = 0x00010000; 2829 prom_setprop(isa, name, "ranges", 2830 isa_ranges, sizeof(isa_ranges)); 2831 } 2832 2833 #define CPC925_MC_START 0xf8000000 2834 #define CPC925_MC_LENGTH 0x1000000 2835 /* The values for memory-controller don't have right number of cells */ 2836 static void __init fixup_device_tree_maple_memory_controller(void) 2837 { 2838 phandle mc; 2839 u32 mc_reg[4]; 2840 char *name = "/hostbridge@f8000000"; 2841 u32 ac, sc; 2842 2843 mc = call_prom("finddevice", 1, 1, ADDR(name)); 2844 if (!PHANDLE_VALID(mc)) 2845 return; 2846 2847 if (prom_getproplen(mc, "reg") != 8) 2848 return; 2849 2850 prom_getprop(prom.root, "#address-cells", &ac, sizeof(ac)); 2851 prom_getprop(prom.root, "#size-cells", &sc, sizeof(sc)); 2852 if ((ac != 2) || (sc != 2)) 2853 return; 2854 2855 if (prom_getprop(mc, "reg", mc_reg, sizeof(mc_reg)) == PROM_ERROR) 2856 return; 2857 2858 if (mc_reg[0] != CPC925_MC_START || mc_reg[1] != CPC925_MC_LENGTH) 2859 return; 2860 2861 prom_printf("Fixing up bogus hostbridge on Maple...\n"); 2862 2863 mc_reg[0] = 0x0; 2864 mc_reg[1] = CPC925_MC_START; 2865 mc_reg[2] = 0x0; 2866 mc_reg[3] = CPC925_MC_LENGTH; 2867 prom_setprop(mc, name, "reg", mc_reg, sizeof(mc_reg)); 2868 } 2869 #else 2870 #define fixup_device_tree_maple() 2871 #define fixup_device_tree_maple_memory_controller() 2872 #endif 2873 2874 #ifdef CONFIG_PPC_CHRP 2875 /* 2876 * Pegasos and BriQ lacks the "ranges" property in the isa node 2877 * Pegasos needs decimal IRQ 14/15, not hexadecimal 2878 * Pegasos has the IDE configured in legacy mode, but advertised as native 2879 */ 2880 static void __init fixup_device_tree_chrp(void) 2881 { 2882 phandle ph; 2883 u32 prop[6]; 2884 u32 rloc = 0x01006000; /* IO space; PCI device = 12 */ 2885 char *name; 2886 int rc; 2887 2888 name = "/pci@80000000/isa@c"; 2889 ph = call_prom("finddevice", 1, 1, ADDR(name)); 2890 if (!PHANDLE_VALID(ph)) { 2891 name = "/pci@ff500000/isa@6"; 2892 ph = call_prom("finddevice", 1, 1, ADDR(name)); 2893 rloc = 0x01003000; /* IO space; PCI device = 6 */ 2894 } 2895 if (PHANDLE_VALID(ph)) { 2896 rc = prom_getproplen(ph, "ranges"); 2897 if (rc == 0 || rc == PROM_ERROR) { 2898 prom_printf("Fixing up missing ISA range on Pegasos...\n"); 2899 2900 prop[0] = 0x1; 2901 prop[1] = 0x0; 2902 prop[2] = rloc; 2903 prop[3] = 0x0; 2904 prop[4] = 0x0; 2905 prop[5] = 0x00010000; 2906 prom_setprop(ph, name, "ranges", prop, sizeof(prop)); 2907 } 2908 } 2909 2910 name = "/pci@80000000/ide@C,1"; 2911 ph = call_prom("finddevice", 1, 1, ADDR(name)); 2912 if (PHANDLE_VALID(ph)) { 2913 prom_printf("Fixing up IDE interrupt on Pegasos...\n"); 2914 prop[0] = 14; 2915 prop[1] = 0x0; 2916 prom_setprop(ph, name, "interrupts", prop, 2*sizeof(u32)); 2917 prom_printf("Fixing up IDE class-code on Pegasos...\n"); 2918 rc = prom_getprop(ph, "class-code", prop, sizeof(u32)); 2919 if (rc == sizeof(u32)) { 2920 prop[0] &= ~0x5; 2921 prom_setprop(ph, name, "class-code", prop, sizeof(u32)); 2922 } 2923 } 2924 } 2925 #else 2926 #define fixup_device_tree_chrp() 2927 #endif 2928 2929 #if defined(CONFIG_PPC64) && defined(CONFIG_PPC_PMAC) 2930 static void __init fixup_device_tree_pmac(void) 2931 { 2932 phandle u3, i2c, mpic; 2933 u32 u3_rev; 2934 u32 interrupts[2]; 2935 u32 parent; 2936 2937 /* Some G5s have a missing interrupt definition, fix it up here */ 2938 u3 = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000")); 2939 if (!PHANDLE_VALID(u3)) 2940 return; 2941 i2c = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/i2c@f8001000")); 2942 if (!PHANDLE_VALID(i2c)) 2943 return; 2944 mpic = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/mpic@f8040000")); 2945 if (!PHANDLE_VALID(mpic)) 2946 return; 2947 2948 /* check if proper rev of u3 */ 2949 if (prom_getprop(u3, "device-rev", &u3_rev, sizeof(u3_rev)) 2950 == PROM_ERROR) 2951 return; 2952 if (u3_rev < 0x35 || u3_rev > 0x39) 2953 return; 2954 /* does it need fixup ? */ 2955 if (prom_getproplen(i2c, "interrupts") > 0) 2956 return; 2957 2958 prom_printf("fixing up bogus interrupts for u3 i2c...\n"); 2959 2960 /* interrupt on this revision of u3 is number 0 and level */ 2961 interrupts[0] = 0; 2962 interrupts[1] = 1; 2963 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupts", 2964 &interrupts, sizeof(interrupts)); 2965 parent = (u32)mpic; 2966 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupt-parent", 2967 &parent, sizeof(parent)); 2968 } 2969 #else 2970 #define fixup_device_tree_pmac() 2971 #endif 2972 2973 #ifdef CONFIG_PPC_EFIKA 2974 /* 2975 * The MPC5200 FEC driver requires an phy-handle property to tell it how 2976 * to talk to the phy. If the phy-handle property is missing, then this 2977 * function is called to add the appropriate nodes and link it to the 2978 * ethernet node. 2979 */ 2980 static void __init fixup_device_tree_efika_add_phy(void) 2981 { 2982 u32 node; 2983 char prop[64]; 2984 int rv; 2985 2986 /* Check if /builtin/ethernet exists - bail if it doesn't */ 2987 node = call_prom("finddevice", 1, 1, ADDR("/builtin/ethernet")); 2988 if (!PHANDLE_VALID(node)) 2989 return; 2990 2991 /* Check if the phy-handle property exists - bail if it does */ 2992 rv = prom_getprop(node, "phy-handle", prop, sizeof(prop)); 2993 if (!rv) 2994 return; 2995 2996 /* 2997 * At this point the ethernet device doesn't have a phy described. 2998 * Now we need to add the missing phy node and linkage 2999 */ 3000 3001 /* Check for an MDIO bus node - if missing then create one */ 3002 node = call_prom("finddevice", 1, 1, ADDR("/builtin/mdio")); 3003 if (!PHANDLE_VALID(node)) { 3004 prom_printf("Adding Ethernet MDIO node\n"); 3005 call_prom("interpret", 1, 1, 3006 " s\" /builtin\" find-device" 3007 " new-device" 3008 " 1 encode-int s\" #address-cells\" property" 3009 " 0 encode-int s\" #size-cells\" property" 3010 " s\" mdio\" device-name" 3011 " s\" fsl,mpc5200b-mdio\" encode-string" 3012 " s\" compatible\" property" 3013 " 0xf0003000 0x400 reg" 3014 " 0x2 encode-int" 3015 " 0x5 encode-int encode+" 3016 " 0x3 encode-int encode+" 3017 " s\" interrupts\" property" 3018 " finish-device"); 3019 } 3020 3021 /* Check for a PHY device node - if missing then create one and 3022 * give it's phandle to the ethernet node */ 3023 node = call_prom("finddevice", 1, 1, 3024 ADDR("/builtin/mdio/ethernet-phy")); 3025 if (!PHANDLE_VALID(node)) { 3026 prom_printf("Adding Ethernet PHY node\n"); 3027 call_prom("interpret", 1, 1, 3028 " s\" /builtin/mdio\" find-device" 3029 " new-device" 3030 " s\" ethernet-phy\" device-name" 3031 " 0x10 encode-int s\" reg\" property" 3032 " my-self" 3033 " ihandle>phandle" 3034 " finish-device" 3035 " s\" /builtin/ethernet\" find-device" 3036 " encode-int" 3037 " s\" phy-handle\" property" 3038 " device-end"); 3039 } 3040 } 3041 3042 static void __init fixup_device_tree_efika(void) 3043 { 3044 int sound_irq[3] = { 2, 2, 0 }; 3045 int bcomm_irq[3*16] = { 3,0,0, 3,1,0, 3,2,0, 3,3,0, 3046 3,4,0, 3,5,0, 3,6,0, 3,7,0, 3047 3,8,0, 3,9,0, 3,10,0, 3,11,0, 3048 3,12,0, 3,13,0, 3,14,0, 3,15,0 }; 3049 u32 node; 3050 char prop[64]; 3051 int rv, len; 3052 3053 /* Check if we're really running on a EFIKA */ 3054 node = call_prom("finddevice", 1, 1, ADDR("/")); 3055 if (!PHANDLE_VALID(node)) 3056 return; 3057 3058 rv = prom_getprop(node, "model", prop, sizeof(prop)); 3059 if (rv == PROM_ERROR) 3060 return; 3061 if (prom_strcmp(prop, "EFIKA5K2")) 3062 return; 3063 3064 prom_printf("Applying EFIKA device tree fixups\n"); 3065 3066 /* Claiming to be 'chrp' is death */ 3067 node = call_prom("finddevice", 1, 1, ADDR("/")); 3068 rv = prom_getprop(node, "device_type", prop, sizeof(prop)); 3069 if (rv != PROM_ERROR && (prom_strcmp(prop, "chrp") == 0)) 3070 prom_setprop(node, "/", "device_type", "efika", sizeof("efika")); 3071 3072 /* CODEGEN,description is exposed in /proc/cpuinfo so 3073 fix that too */ 3074 rv = prom_getprop(node, "CODEGEN,description", prop, sizeof(prop)); 3075 if (rv != PROM_ERROR && (prom_strstr(prop, "CHRP"))) 3076 prom_setprop(node, "/", "CODEGEN,description", 3077 "Efika 5200B PowerPC System", 3078 sizeof("Efika 5200B PowerPC System")); 3079 3080 /* Fixup bestcomm interrupts property */ 3081 node = call_prom("finddevice", 1, 1, ADDR("/builtin/bestcomm")); 3082 if (PHANDLE_VALID(node)) { 3083 len = prom_getproplen(node, "interrupts"); 3084 if (len == 12) { 3085 prom_printf("Fixing bestcomm interrupts property\n"); 3086 prom_setprop(node, "/builtin/bestcom", "interrupts", 3087 bcomm_irq, sizeof(bcomm_irq)); 3088 } 3089 } 3090 3091 /* Fixup sound interrupts property */ 3092 node = call_prom("finddevice", 1, 1, ADDR("/builtin/sound")); 3093 if (PHANDLE_VALID(node)) { 3094 rv = prom_getprop(node, "interrupts", prop, sizeof(prop)); 3095 if (rv == PROM_ERROR) { 3096 prom_printf("Adding sound interrupts property\n"); 3097 prom_setprop(node, "/builtin/sound", "interrupts", 3098 sound_irq, sizeof(sound_irq)); 3099 } 3100 } 3101 3102 /* Make sure ethernet phy-handle property exists */ 3103 fixup_device_tree_efika_add_phy(); 3104 } 3105 #else 3106 #define fixup_device_tree_efika() 3107 #endif 3108 3109 #ifdef CONFIG_PPC_PASEMI_NEMO 3110 /* 3111 * CFE supplied on Nemo is broken in several ways, biggest 3112 * problem is that it reassigns ISA interrupts to unused mpic ints. 3113 * Add an interrupt-controller property for the io-bridge to use 3114 * and correct the ints so we can attach them to an irq_domain 3115 */ 3116 static void __init fixup_device_tree_pasemi(void) 3117 { 3118 u32 interrupts[2], parent, rval, val = 0; 3119 char *name, *pci_name; 3120 phandle iob, node; 3121 3122 /* Find the root pci node */ 3123 name = "/pxp@0,e0000000"; 3124 iob = call_prom("finddevice", 1, 1, ADDR(name)); 3125 if (!PHANDLE_VALID(iob)) 3126 return; 3127 3128 /* check if interrupt-controller node set yet */ 3129 if (prom_getproplen(iob, "interrupt-controller") !=PROM_ERROR) 3130 return; 3131 3132 prom_printf("adding interrupt-controller property for SB600...\n"); 3133 3134 prom_setprop(iob, name, "interrupt-controller", &val, 0); 3135 3136 pci_name = "/pxp@0,e0000000/pci@11"; 3137 node = call_prom("finddevice", 1, 1, ADDR(pci_name)); 3138 parent = ADDR(iob); 3139 3140 for( ; prom_next_node(&node); ) { 3141 /* scan each node for one with an interrupt */ 3142 if (!PHANDLE_VALID(node)) 3143 continue; 3144 3145 rval = prom_getproplen(node, "interrupts"); 3146 if (rval == 0 || rval == PROM_ERROR) 3147 continue; 3148 3149 prom_getprop(node, "interrupts", &interrupts, sizeof(interrupts)); 3150 if ((interrupts[0] < 212) || (interrupts[0] > 222)) 3151 continue; 3152 3153 /* found a node, update both interrupts and interrupt-parent */ 3154 if ((interrupts[0] >= 212) && (interrupts[0] <= 215)) 3155 interrupts[0] -= 203; 3156 if ((interrupts[0] >= 216) && (interrupts[0] <= 220)) 3157 interrupts[0] -= 213; 3158 if (interrupts[0] == 221) 3159 interrupts[0] = 14; 3160 if (interrupts[0] == 222) 3161 interrupts[0] = 8; 3162 3163 prom_setprop(node, pci_name, "interrupts", interrupts, 3164 sizeof(interrupts)); 3165 prom_setprop(node, pci_name, "interrupt-parent", &parent, 3166 sizeof(parent)); 3167 } 3168 3169 /* 3170 * The io-bridge has device_type set to 'io-bridge' change it to 'isa' 3171 * so that generic isa-bridge code can add the SB600 and its on-board 3172 * peripherals. 3173 */ 3174 name = "/pxp@0,e0000000/io-bridge@0"; 3175 iob = call_prom("finddevice", 1, 1, ADDR(name)); 3176 if (!PHANDLE_VALID(iob)) 3177 return; 3178 3179 /* device_type is already set, just change it. */ 3180 3181 prom_printf("Changing device_type of SB600 node...\n"); 3182 3183 prom_setprop(iob, name, "device_type", "isa", sizeof("isa")); 3184 } 3185 #else /* !CONFIG_PPC_PASEMI_NEMO */ 3186 static inline void fixup_device_tree_pasemi(void) { } 3187 #endif 3188 3189 static void __init fixup_device_tree(void) 3190 { 3191 fixup_device_tree_maple(); 3192 fixup_device_tree_maple_memory_controller(); 3193 fixup_device_tree_chrp(); 3194 fixup_device_tree_pmac(); 3195 fixup_device_tree_efika(); 3196 fixup_device_tree_pasemi(); 3197 } 3198 3199 static void __init prom_find_boot_cpu(void) 3200 { 3201 __be32 rval; 3202 ihandle prom_cpu; 3203 phandle cpu_pkg; 3204 3205 rval = 0; 3206 if (prom_getprop(prom.chosen, "cpu", &rval, sizeof(rval)) <= 0) 3207 return; 3208 prom_cpu = be32_to_cpu(rval); 3209 3210 cpu_pkg = call_prom("instance-to-package", 1, 1, prom_cpu); 3211 3212 if (!PHANDLE_VALID(cpu_pkg)) 3213 return; 3214 3215 prom_getprop(cpu_pkg, "reg", &rval, sizeof(rval)); 3216 prom.cpu = be32_to_cpu(rval); 3217 3218 prom_debug("Booting CPU hw index = %d\n", prom.cpu); 3219 } 3220 3221 static void __init prom_check_initrd(unsigned long r3, unsigned long r4) 3222 { 3223 #ifdef CONFIG_BLK_DEV_INITRD 3224 if (r3 && r4 && r4 != 0xdeadbeef) { 3225 __be64 val; 3226 3227 prom_initrd_start = is_kernel_addr(r3) ? __pa(r3) : r3; 3228 prom_initrd_end = prom_initrd_start + r4; 3229 3230 val = cpu_to_be64(prom_initrd_start); 3231 prom_setprop(prom.chosen, "/chosen", "linux,initrd-start", 3232 &val, sizeof(val)); 3233 val = cpu_to_be64(prom_initrd_end); 3234 prom_setprop(prom.chosen, "/chosen", "linux,initrd-end", 3235 &val, sizeof(val)); 3236 3237 reserve_mem(prom_initrd_start, 3238 prom_initrd_end - prom_initrd_start); 3239 3240 prom_debug("initrd_start=0x%lx\n", prom_initrd_start); 3241 prom_debug("initrd_end=0x%lx\n", prom_initrd_end); 3242 } 3243 #endif /* CONFIG_BLK_DEV_INITRD */ 3244 } 3245 3246 #ifdef CONFIG_PPC_SVM 3247 /* 3248 * Perform the Enter Secure Mode ultracall. 3249 */ 3250 static int enter_secure_mode(unsigned long kbase, unsigned long fdt) 3251 { 3252 register unsigned long r3 asm("r3") = UV_ESM; 3253 register unsigned long r4 asm("r4") = kbase; 3254 register unsigned long r5 asm("r5") = fdt; 3255 3256 asm volatile("sc 2" : "+r"(r3) : "r"(r4), "r"(r5)); 3257 3258 return r3; 3259 } 3260 3261 /* 3262 * Call the Ultravisor to transfer us to secure memory if we have an ESM blob. 3263 */ 3264 static void __init setup_secure_guest(unsigned long kbase, unsigned long fdt) 3265 { 3266 int ret; 3267 3268 if (!prom_svm_enable) 3269 return; 3270 3271 /* Switch to secure mode. */ 3272 prom_printf("Switching to secure mode.\n"); 3273 3274 /* 3275 * The ultravisor will do an integrity check of the kernel image but we 3276 * relocated it so the check will fail. Restore the original image by 3277 * relocating it back to the kernel virtual base address. 3278 */ 3279 relocate(KERNELBASE); 3280 3281 ret = enter_secure_mode(kbase, fdt); 3282 3283 /* Relocate the kernel again. */ 3284 relocate(kbase); 3285 3286 if (ret != U_SUCCESS) { 3287 prom_printf("Returned %d from switching to secure mode.\n", ret); 3288 prom_rtas_os_term("Switch to secure mode failed.\n"); 3289 } 3290 } 3291 #else 3292 static void __init setup_secure_guest(unsigned long kbase, unsigned long fdt) 3293 { 3294 } 3295 #endif /* CONFIG_PPC_SVM */ 3296 3297 /* 3298 * We enter here early on, when the Open Firmware prom is still 3299 * handling exceptions and the MMU hash table for us. 3300 */ 3301 3302 unsigned long __init prom_init(unsigned long r3, unsigned long r4, 3303 unsigned long pp, 3304 unsigned long r6, unsigned long r7, 3305 unsigned long kbase) 3306 { 3307 unsigned long hdr; 3308 3309 #ifdef CONFIG_PPC32 3310 unsigned long offset = reloc_offset(); 3311 reloc_got2(offset); 3312 #endif 3313 3314 /* 3315 * First zero the BSS 3316 */ 3317 memset(&__bss_start, 0, __bss_stop - __bss_start); 3318 3319 /* 3320 * Init interface to Open Firmware, get some node references, 3321 * like /chosen 3322 */ 3323 prom_init_client_services(pp); 3324 3325 /* 3326 * See if this OF is old enough that we need to do explicit maps 3327 * and other workarounds 3328 */ 3329 prom_find_mmu(); 3330 3331 /* 3332 * Init prom stdout device 3333 */ 3334 prom_init_stdout(); 3335 3336 prom_printf("Preparing to boot %s", linux_banner); 3337 3338 /* 3339 * Get default machine type. At this point, we do not differentiate 3340 * between pSeries SMP and pSeries LPAR 3341 */ 3342 of_platform = prom_find_machine_type(); 3343 prom_printf("Detected machine type: %x\n", of_platform); 3344 3345 #ifndef CONFIG_NONSTATIC_KERNEL 3346 /* Bail if this is a kdump kernel. */ 3347 if (PHYSICAL_START > 0) 3348 prom_panic("Error: You can't boot a kdump kernel from OF!\n"); 3349 #endif 3350 3351 /* 3352 * Check for an initrd 3353 */ 3354 prom_check_initrd(r3, r4); 3355 3356 /* 3357 * Do early parsing of command line 3358 */ 3359 early_cmdline_parse(); 3360 3361 #ifdef CONFIG_PPC_PSERIES 3362 /* 3363 * On pSeries, inform the firmware about our capabilities 3364 */ 3365 if (of_platform == PLATFORM_PSERIES || 3366 of_platform == PLATFORM_PSERIES_LPAR) 3367 prom_send_capabilities(); 3368 #endif 3369 3370 /* 3371 * Copy the CPU hold code 3372 */ 3373 if (of_platform != PLATFORM_POWERMAC) 3374 copy_and_flush(0, kbase, 0x100, 0); 3375 3376 /* 3377 * Initialize memory management within prom_init 3378 */ 3379 prom_init_mem(); 3380 3381 /* 3382 * Determine which cpu is actually running right _now_ 3383 */ 3384 prom_find_boot_cpu(); 3385 3386 /* 3387 * Initialize display devices 3388 */ 3389 prom_check_displays(); 3390 3391 #if defined(CONFIG_PPC64) && defined(__BIG_ENDIAN__) 3392 /* 3393 * Initialize IOMMU (TCE tables) on pSeries. Do that before anything else 3394 * that uses the allocator, we need to make sure we get the top of memory 3395 * available for us here... 3396 */ 3397 if (of_platform == PLATFORM_PSERIES) 3398 prom_initialize_tce_table(); 3399 #endif 3400 3401 /* 3402 * On non-powermacs, try to instantiate RTAS. PowerMacs don't 3403 * have a usable RTAS implementation. 3404 */ 3405 if (of_platform != PLATFORM_POWERMAC) 3406 prom_instantiate_rtas(); 3407 3408 #ifdef CONFIG_PPC64 3409 /* instantiate sml */ 3410 prom_instantiate_sml(); 3411 #endif 3412 3413 /* 3414 * On non-powermacs, put all CPUs in spin-loops. 3415 * 3416 * PowerMacs use a different mechanism to spin CPUs 3417 * 3418 * (This must be done after instanciating RTAS) 3419 */ 3420 if (of_platform != PLATFORM_POWERMAC) 3421 prom_hold_cpus(); 3422 3423 /* 3424 * Fill in some infos for use by the kernel later on 3425 */ 3426 if (prom_memory_limit) { 3427 __be64 val = cpu_to_be64(prom_memory_limit); 3428 prom_setprop(prom.chosen, "/chosen", "linux,memory-limit", 3429 &val, sizeof(val)); 3430 } 3431 #ifdef CONFIG_PPC64 3432 if (prom_iommu_off) 3433 prom_setprop(prom.chosen, "/chosen", "linux,iommu-off", 3434 NULL, 0); 3435 3436 if (prom_iommu_force_on) 3437 prom_setprop(prom.chosen, "/chosen", "linux,iommu-force-on", 3438 NULL, 0); 3439 3440 if (prom_tce_alloc_start) { 3441 prom_setprop(prom.chosen, "/chosen", "linux,tce-alloc-start", 3442 &prom_tce_alloc_start, 3443 sizeof(prom_tce_alloc_start)); 3444 prom_setprop(prom.chosen, "/chosen", "linux,tce-alloc-end", 3445 &prom_tce_alloc_end, 3446 sizeof(prom_tce_alloc_end)); 3447 } 3448 #endif 3449 3450 /* 3451 * Fixup any known bugs in the device-tree 3452 */ 3453 fixup_device_tree(); 3454 3455 /* 3456 * Now finally create the flattened device-tree 3457 */ 3458 prom_printf("copying OF device tree...\n"); 3459 flatten_device_tree(); 3460 3461 /* 3462 * in case stdin is USB and still active on IBM machines... 3463 * Unfortunately quiesce crashes on some powermacs if we have 3464 * closed stdin already (in particular the powerbook 101). 3465 */ 3466 if (of_platform != PLATFORM_POWERMAC) 3467 prom_close_stdin(); 3468 3469 /* 3470 * Call OF "quiesce" method to shut down pending DMA's from 3471 * devices etc... 3472 */ 3473 prom_printf("Quiescing Open Firmware ...\n"); 3474 call_prom("quiesce", 0, 0); 3475 3476 /* 3477 * And finally, call the kernel passing it the flattened device 3478 * tree and NULL as r5, thus triggering the new entry point which 3479 * is common to us and kexec 3480 */ 3481 hdr = dt_header_start; 3482 3483 prom_printf("Booting Linux via __start() @ 0x%lx ...\n", kbase); 3484 prom_debug("->dt_header_start=0x%lx\n", hdr); 3485 3486 #ifdef CONFIG_PPC32 3487 reloc_got2(-offset); 3488 #endif 3489 3490 /* Move to secure memory if we're supposed to be secure guests. */ 3491 setup_secure_guest(kbase, hdr); 3492 3493 __start(hdr, kbase, 0, 0, 0, 0, 0); 3494 3495 return 0; 3496 } 3497