1 /* 2 * Procedures for interfacing to Open Firmware. 3 * 4 * Paul Mackerras August 1996. 5 * Copyright (C) 1996-2005 Paul Mackerras. 6 * 7 * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner. 8 * {engebret|bergner}@us.ibm.com 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License 12 * as published by the Free Software Foundation; either version 13 * 2 of the License, or (at your option) any later version. 14 */ 15 16 #undef DEBUG_PROM 17 18 #include <stdarg.h> 19 #include <linux/kernel.h> 20 #include <linux/string.h> 21 #include <linux/init.h> 22 #include <linux/threads.h> 23 #include <linux/spinlock.h> 24 #include <linux/types.h> 25 #include <linux/pci.h> 26 #include <linux/proc_fs.h> 27 #include <linux/stringify.h> 28 #include <linux/delay.h> 29 #include <linux/initrd.h> 30 #include <linux/bitops.h> 31 #include <asm/prom.h> 32 #include <asm/rtas.h> 33 #include <asm/page.h> 34 #include <asm/processor.h> 35 #include <asm/irq.h> 36 #include <asm/io.h> 37 #include <asm/smp.h> 38 #include <asm/system.h> 39 #include <asm/mmu.h> 40 #include <asm/pgtable.h> 41 #include <asm/pci.h> 42 #include <asm/iommu.h> 43 #include <asm/btext.h> 44 #include <asm/sections.h> 45 #include <asm/machdep.h> 46 47 #include <linux/linux_logo.h> 48 49 /* 50 * Properties whose value is longer than this get excluded from our 51 * copy of the device tree. This value does need to be big enough to 52 * ensure that we don't lose things like the interrupt-map property 53 * on a PCI-PCI bridge. 54 */ 55 #define MAX_PROPERTY_LENGTH (1UL * 1024 * 1024) 56 57 /* 58 * Eventually bump that one up 59 */ 60 #define DEVTREE_CHUNK_SIZE 0x100000 61 62 /* 63 * This is the size of the local memory reserve map that gets copied 64 * into the boot params passed to the kernel. That size is totally 65 * flexible as the kernel just reads the list until it encounters an 66 * entry with size 0, so it can be changed without breaking binary 67 * compatibility 68 */ 69 #define MEM_RESERVE_MAP_SIZE 8 70 71 /* 72 * prom_init() is called very early on, before the kernel text 73 * and data have been mapped to KERNELBASE. At this point the code 74 * is running at whatever address it has been loaded at. 75 * On ppc32 we compile with -mrelocatable, which means that references 76 * to extern and static variables get relocated automatically. 77 * On ppc64 we have to relocate the references explicitly with 78 * RELOC. (Note that strings count as static variables.) 79 * 80 * Because OF may have mapped I/O devices into the area starting at 81 * KERNELBASE, particularly on CHRP machines, we can't safely call 82 * OF once the kernel has been mapped to KERNELBASE. Therefore all 83 * OF calls must be done within prom_init(). 84 * 85 * ADDR is used in calls to call_prom. The 4th and following 86 * arguments to call_prom should be 32-bit values. 87 * On ppc64, 64 bit values are truncated to 32 bits (and 88 * fortunately don't get interpreted as two arguments). 89 */ 90 #ifdef CONFIG_PPC64 91 #define RELOC(x) (*PTRRELOC(&(x))) 92 #define ADDR(x) (u32) add_reloc_offset((unsigned long)(x)) 93 #define OF_WORKAROUNDS 0 94 #else 95 #define RELOC(x) (x) 96 #define ADDR(x) (u32) (x) 97 #define OF_WORKAROUNDS of_workarounds 98 int of_workarounds; 99 #endif 100 101 #define OF_WA_CLAIM 1 /* do phys/virt claim separately, then map */ 102 #define OF_WA_LONGTRAIL 2 /* work around longtrail bugs */ 103 104 #define PROM_BUG() do { \ 105 prom_printf("kernel BUG at %s line 0x%x!\n", \ 106 RELOC(__FILE__), __LINE__); \ 107 __asm__ __volatile__(".long " BUG_ILLEGAL_INSTR); \ 108 } while (0) 109 110 #ifdef DEBUG_PROM 111 #define prom_debug(x...) prom_printf(x) 112 #else 113 #define prom_debug(x...) 114 #endif 115 116 117 typedef u32 prom_arg_t; 118 119 struct prom_args { 120 u32 service; 121 u32 nargs; 122 u32 nret; 123 prom_arg_t args[10]; 124 }; 125 126 struct prom_t { 127 ihandle root; 128 phandle chosen; 129 int cpu; 130 ihandle stdout; 131 ihandle mmumap; 132 ihandle memory; 133 }; 134 135 struct mem_map_entry { 136 u64 base; 137 u64 size; 138 }; 139 140 typedef u32 cell_t; 141 142 extern void __start(unsigned long r3, unsigned long r4, unsigned long r5); 143 144 #ifdef CONFIG_PPC64 145 extern int enter_prom(struct prom_args *args, unsigned long entry); 146 #else 147 static inline int enter_prom(struct prom_args *args, unsigned long entry) 148 { 149 return ((int (*)(struct prom_args *))entry)(args); 150 } 151 #endif 152 153 extern void copy_and_flush(unsigned long dest, unsigned long src, 154 unsigned long size, unsigned long offset); 155 156 /* prom structure */ 157 static struct prom_t __initdata prom; 158 159 static unsigned long prom_entry __initdata; 160 161 #define PROM_SCRATCH_SIZE 256 162 163 static char __initdata of_stdout_device[256]; 164 static char __initdata prom_scratch[PROM_SCRATCH_SIZE]; 165 166 static unsigned long __initdata dt_header_start; 167 static unsigned long __initdata dt_struct_start, dt_struct_end; 168 static unsigned long __initdata dt_string_start, dt_string_end; 169 170 static unsigned long __initdata prom_initrd_start, prom_initrd_end; 171 172 #ifdef CONFIG_PPC64 173 static int __initdata prom_iommu_force_on; 174 static int __initdata prom_iommu_off; 175 static unsigned long __initdata prom_tce_alloc_start; 176 static unsigned long __initdata prom_tce_alloc_end; 177 #endif 178 179 /* Platforms codes are now obsolete in the kernel. Now only used within this 180 * file and ultimately gone too. Feel free to change them if you need, they 181 * are not shared with anything outside of this file anymore 182 */ 183 #define PLATFORM_PSERIES 0x0100 184 #define PLATFORM_PSERIES_LPAR 0x0101 185 #define PLATFORM_LPAR 0x0001 186 #define PLATFORM_POWERMAC 0x0400 187 #define PLATFORM_GENERIC 0x0500 188 189 static int __initdata of_platform; 190 191 static char __initdata prom_cmd_line[COMMAND_LINE_SIZE]; 192 193 static unsigned long __initdata prom_memory_limit; 194 195 static unsigned long __initdata alloc_top; 196 static unsigned long __initdata alloc_top_high; 197 static unsigned long __initdata alloc_bottom; 198 static unsigned long __initdata rmo_top; 199 static unsigned long __initdata ram_top; 200 201 static struct mem_map_entry __initdata mem_reserve_map[MEM_RESERVE_MAP_SIZE]; 202 static int __initdata mem_reserve_cnt; 203 204 static cell_t __initdata regbuf[1024]; 205 206 207 /* 208 * Error results ... some OF calls will return "-1" on error, some 209 * will return 0, some will return either. To simplify, here are 210 * macros to use with any ihandle or phandle return value to check if 211 * it is valid 212 */ 213 214 #define PROM_ERROR (-1u) 215 #define PHANDLE_VALID(p) ((p) != 0 && (p) != PROM_ERROR) 216 #define IHANDLE_VALID(i) ((i) != 0 && (i) != PROM_ERROR) 217 218 219 /* This is the one and *ONLY* place where we actually call open 220 * firmware. 221 */ 222 223 static int __init call_prom(const char *service, int nargs, int nret, ...) 224 { 225 int i; 226 struct prom_args args; 227 va_list list; 228 229 args.service = ADDR(service); 230 args.nargs = nargs; 231 args.nret = nret; 232 233 va_start(list, nret); 234 for (i = 0; i < nargs; i++) 235 args.args[i] = va_arg(list, prom_arg_t); 236 va_end(list); 237 238 for (i = 0; i < nret; i++) 239 args.args[nargs+i] = 0; 240 241 if (enter_prom(&args, RELOC(prom_entry)) < 0) 242 return PROM_ERROR; 243 244 return (nret > 0) ? args.args[nargs] : 0; 245 } 246 247 static int __init call_prom_ret(const char *service, int nargs, int nret, 248 prom_arg_t *rets, ...) 249 { 250 int i; 251 struct prom_args args; 252 va_list list; 253 254 args.service = ADDR(service); 255 args.nargs = nargs; 256 args.nret = nret; 257 258 va_start(list, rets); 259 for (i = 0; i < nargs; i++) 260 args.args[i] = va_arg(list, prom_arg_t); 261 va_end(list); 262 263 for (i = 0; i < nret; i++) 264 args.args[nargs+i] = 0; 265 266 if (enter_prom(&args, RELOC(prom_entry)) < 0) 267 return PROM_ERROR; 268 269 if (rets != NULL) 270 for (i = 1; i < nret; ++i) 271 rets[i-1] = args.args[nargs+i]; 272 273 return (nret > 0) ? args.args[nargs] : 0; 274 } 275 276 277 static void __init prom_print(const char *msg) 278 { 279 const char *p, *q; 280 struct prom_t *_prom = &RELOC(prom); 281 282 if (_prom->stdout == 0) 283 return; 284 285 for (p = msg; *p != 0; p = q) { 286 for (q = p; *q != 0 && *q != '\n'; ++q) 287 ; 288 if (q > p) 289 call_prom("write", 3, 1, _prom->stdout, p, q - p); 290 if (*q == 0) 291 break; 292 ++q; 293 call_prom("write", 3, 1, _prom->stdout, ADDR("\r\n"), 2); 294 } 295 } 296 297 298 static void __init prom_print_hex(unsigned long val) 299 { 300 int i, nibbles = sizeof(val)*2; 301 char buf[sizeof(val)*2+1]; 302 struct prom_t *_prom = &RELOC(prom); 303 304 for (i = nibbles-1; i >= 0; i--) { 305 buf[i] = (val & 0xf) + '0'; 306 if (buf[i] > '9') 307 buf[i] += ('a'-'0'-10); 308 val >>= 4; 309 } 310 buf[nibbles] = '\0'; 311 call_prom("write", 3, 1, _prom->stdout, buf, nibbles); 312 } 313 314 /* max number of decimal digits in an unsigned long */ 315 #define UL_DIGITS 21 316 static void __init prom_print_dec(unsigned long val) 317 { 318 int i, size; 319 char buf[UL_DIGITS+1]; 320 struct prom_t *_prom = &RELOC(prom); 321 322 for (i = UL_DIGITS-1; i >= 0; i--) { 323 buf[i] = (val % 10) + '0'; 324 val = val/10; 325 if (val == 0) 326 break; 327 } 328 /* shift stuff down */ 329 size = UL_DIGITS - i; 330 call_prom("write", 3, 1, _prom->stdout, buf+i, size); 331 } 332 333 static void __init prom_printf(const char *format, ...) 334 { 335 const char *p, *q, *s; 336 va_list args; 337 unsigned long v; 338 struct prom_t *_prom = &RELOC(prom); 339 340 va_start(args, format); 341 #ifdef CONFIG_PPC64 342 format = PTRRELOC(format); 343 #endif 344 for (p = format; *p != 0; p = q) { 345 for (q = p; *q != 0 && *q != '\n' && *q != '%'; ++q) 346 ; 347 if (q > p) 348 call_prom("write", 3, 1, _prom->stdout, p, q - p); 349 if (*q == 0) 350 break; 351 if (*q == '\n') { 352 ++q; 353 call_prom("write", 3, 1, _prom->stdout, 354 ADDR("\r\n"), 2); 355 continue; 356 } 357 ++q; 358 if (*q == 0) 359 break; 360 switch (*q) { 361 case 's': 362 ++q; 363 s = va_arg(args, const char *); 364 prom_print(s); 365 break; 366 case 'x': 367 ++q; 368 v = va_arg(args, unsigned long); 369 prom_print_hex(v); 370 break; 371 case 'l': 372 ++q; 373 if (*q == 'u') { /* '%lu' */ 374 ++q; 375 v = va_arg(args, unsigned long); 376 prom_print_dec(v); 377 } 378 break; 379 } 380 } 381 } 382 383 384 static unsigned int __init prom_claim(unsigned long virt, unsigned long size, 385 unsigned long align) 386 { 387 struct prom_t *_prom = &RELOC(prom); 388 389 if (align == 0 && (OF_WORKAROUNDS & OF_WA_CLAIM)) { 390 /* 391 * Old OF requires we claim physical and virtual separately 392 * and then map explicitly (assuming virtual mode) 393 */ 394 int ret; 395 prom_arg_t result; 396 397 ret = call_prom_ret("call-method", 5, 2, &result, 398 ADDR("claim"), _prom->memory, 399 align, size, virt); 400 if (ret != 0 || result == -1) 401 return -1; 402 ret = call_prom_ret("call-method", 5, 2, &result, 403 ADDR("claim"), _prom->mmumap, 404 align, size, virt); 405 if (ret != 0) { 406 call_prom("call-method", 4, 1, ADDR("release"), 407 _prom->memory, size, virt); 408 return -1; 409 } 410 /* the 0x12 is M (coherence) + PP == read/write */ 411 call_prom("call-method", 6, 1, 412 ADDR("map"), _prom->mmumap, 0x12, size, virt, virt); 413 return virt; 414 } 415 return call_prom("claim", 3, 1, (prom_arg_t)virt, (prom_arg_t)size, 416 (prom_arg_t)align); 417 } 418 419 static void __init __attribute__((noreturn)) prom_panic(const char *reason) 420 { 421 #ifdef CONFIG_PPC64 422 reason = PTRRELOC(reason); 423 #endif 424 prom_print(reason); 425 /* Do not call exit because it clears the screen on pmac 426 * it also causes some sort of double-fault on early pmacs */ 427 if (RELOC(of_platform) == PLATFORM_POWERMAC) 428 asm("trap\n"); 429 430 /* ToDo: should put up an SRC here on p/iSeries */ 431 call_prom("exit", 0, 0); 432 433 for (;;) /* should never get here */ 434 ; 435 } 436 437 438 static int __init prom_next_node(phandle *nodep) 439 { 440 phandle node; 441 442 if ((node = *nodep) != 0 443 && (*nodep = call_prom("child", 1, 1, node)) != 0) 444 return 1; 445 if ((*nodep = call_prom("peer", 1, 1, node)) != 0) 446 return 1; 447 for (;;) { 448 if ((node = call_prom("parent", 1, 1, node)) == 0) 449 return 0; 450 if ((*nodep = call_prom("peer", 1, 1, node)) != 0) 451 return 1; 452 } 453 } 454 455 static int inline prom_getprop(phandle node, const char *pname, 456 void *value, size_t valuelen) 457 { 458 return call_prom("getprop", 4, 1, node, ADDR(pname), 459 (u32)(unsigned long) value, (u32) valuelen); 460 } 461 462 static int inline prom_getproplen(phandle node, const char *pname) 463 { 464 return call_prom("getproplen", 2, 1, node, ADDR(pname)); 465 } 466 467 static void add_string(char **str, const char *q) 468 { 469 char *p = *str; 470 471 while (*q) 472 *p++ = *q++; 473 *p++ = ' '; 474 *str = p; 475 } 476 477 static char *tohex(unsigned int x) 478 { 479 static char digits[] = "0123456789abcdef"; 480 static char result[9]; 481 int i; 482 483 result[8] = 0; 484 i = 8; 485 do { 486 --i; 487 result[i] = digits[x & 0xf]; 488 x >>= 4; 489 } while (x != 0 && i > 0); 490 return &result[i]; 491 } 492 493 static int __init prom_setprop(phandle node, const char *nodename, 494 const char *pname, void *value, size_t valuelen) 495 { 496 char cmd[256], *p; 497 498 if (!(OF_WORKAROUNDS & OF_WA_LONGTRAIL)) 499 return call_prom("setprop", 4, 1, node, ADDR(pname), 500 (u32)(unsigned long) value, (u32) valuelen); 501 502 /* gah... setprop doesn't work on longtrail, have to use interpret */ 503 p = cmd; 504 add_string(&p, "dev"); 505 add_string(&p, nodename); 506 add_string(&p, tohex((u32)(unsigned long) value)); 507 add_string(&p, tohex(valuelen)); 508 add_string(&p, tohex(ADDR(pname))); 509 add_string(&p, tohex(strlen(RELOC(pname)))); 510 add_string(&p, "property"); 511 *p = 0; 512 return call_prom("interpret", 1, 1, (u32)(unsigned long) cmd); 513 } 514 515 /* We can't use the standard versions because of RELOC headaches. */ 516 #define isxdigit(c) (('0' <= (c) && (c) <= '9') \ 517 || ('a' <= (c) && (c) <= 'f') \ 518 || ('A' <= (c) && (c) <= 'F')) 519 520 #define isdigit(c) ('0' <= (c) && (c) <= '9') 521 #define islower(c) ('a' <= (c) && (c) <= 'z') 522 #define toupper(c) (islower(c) ? ((c) - 'a' + 'A') : (c)) 523 524 unsigned long prom_strtoul(const char *cp, const char **endp) 525 { 526 unsigned long result = 0, base = 10, value; 527 528 if (*cp == '0') { 529 base = 8; 530 cp++; 531 if (toupper(*cp) == 'X') { 532 cp++; 533 base = 16; 534 } 535 } 536 537 while (isxdigit(*cp) && 538 (value = isdigit(*cp) ? *cp - '0' : toupper(*cp) - 'A' + 10) < base) { 539 result = result * base + value; 540 cp++; 541 } 542 543 if (endp) 544 *endp = cp; 545 546 return result; 547 } 548 549 unsigned long prom_memparse(const char *ptr, const char **retptr) 550 { 551 unsigned long ret = prom_strtoul(ptr, retptr); 552 int shift = 0; 553 554 /* 555 * We can't use a switch here because GCC *may* generate a 556 * jump table which won't work, because we're not running at 557 * the address we're linked at. 558 */ 559 if ('G' == **retptr || 'g' == **retptr) 560 shift = 30; 561 562 if ('M' == **retptr || 'm' == **retptr) 563 shift = 20; 564 565 if ('K' == **retptr || 'k' == **retptr) 566 shift = 10; 567 568 if (shift) { 569 ret <<= shift; 570 (*retptr)++; 571 } 572 573 return ret; 574 } 575 576 /* 577 * Early parsing of the command line passed to the kernel, used for 578 * "mem=x" and the options that affect the iommu 579 */ 580 static void __init early_cmdline_parse(void) 581 { 582 struct prom_t *_prom = &RELOC(prom); 583 const char *opt; 584 585 char *p; 586 int l = 0; 587 588 RELOC(prom_cmd_line[0]) = 0; 589 p = RELOC(prom_cmd_line); 590 if ((long)_prom->chosen > 0) 591 l = prom_getprop(_prom->chosen, "bootargs", p, COMMAND_LINE_SIZE-1); 592 #ifdef CONFIG_CMDLINE 593 if (l <= 0 || p[0] == '\0') /* dbl check */ 594 strlcpy(RELOC(prom_cmd_line), 595 RELOC(CONFIG_CMDLINE), sizeof(prom_cmd_line)); 596 #endif /* CONFIG_CMDLINE */ 597 prom_printf("command line: %s\n", RELOC(prom_cmd_line)); 598 599 #ifdef CONFIG_PPC64 600 opt = strstr(RELOC(prom_cmd_line), RELOC("iommu=")); 601 if (opt) { 602 prom_printf("iommu opt is: %s\n", opt); 603 opt += 6; 604 while (*opt && *opt == ' ') 605 opt++; 606 if (!strncmp(opt, RELOC("off"), 3)) 607 RELOC(prom_iommu_off) = 1; 608 else if (!strncmp(opt, RELOC("force"), 5)) 609 RELOC(prom_iommu_force_on) = 1; 610 } 611 #endif 612 opt = strstr(RELOC(prom_cmd_line), RELOC("mem=")); 613 if (opt) { 614 opt += 4; 615 RELOC(prom_memory_limit) = prom_memparse(opt, (const char **)&opt); 616 #ifdef CONFIG_PPC64 617 /* Align to 16 MB == size of ppc64 large page */ 618 RELOC(prom_memory_limit) = ALIGN(RELOC(prom_memory_limit), 0x1000000); 619 #endif 620 } 621 } 622 623 #ifdef CONFIG_PPC_PSERIES 624 /* 625 * There are two methods for telling firmware what our capabilities are. 626 * Newer machines have an "ibm,client-architecture-support" method on the 627 * root node. For older machines, we have to call the "process-elf-header" 628 * method in the /packages/elf-loader node, passing it a fake 32-bit 629 * ELF header containing a couple of PT_NOTE sections that contain 630 * structures that contain various information. 631 */ 632 633 /* 634 * New method - extensible architecture description vector. 635 * 636 * Because the description vector contains a mix of byte and word 637 * values, we declare it as an unsigned char array, and use this 638 * macro to put word values in. 639 */ 640 #define W(x) ((x) >> 24) & 0xff, ((x) >> 16) & 0xff, \ 641 ((x) >> 8) & 0xff, (x) & 0xff 642 643 /* Option vector bits - generic bits in byte 1 */ 644 #define OV_IGNORE 0x80 /* ignore this vector */ 645 #define OV_CESSATION_POLICY 0x40 /* halt if unsupported option present*/ 646 647 /* Option vector 1: processor architectures supported */ 648 #define OV1_PPC_2_00 0x80 /* set if we support PowerPC 2.00 */ 649 #define OV1_PPC_2_01 0x40 /* set if we support PowerPC 2.01 */ 650 #define OV1_PPC_2_02 0x20 /* set if we support PowerPC 2.02 */ 651 #define OV1_PPC_2_03 0x10 /* set if we support PowerPC 2.03 */ 652 #define OV1_PPC_2_04 0x08 /* set if we support PowerPC 2.04 */ 653 #define OV1_PPC_2_05 0x04 /* set if we support PowerPC 2.05 */ 654 #define OV1_PPC_2_06 0x02 /* set if we support PowerPC 2.06 */ 655 656 /* Option vector 2: Open Firmware options supported */ 657 #define OV2_REAL_MODE 0x20 /* set if we want OF in real mode */ 658 659 /* Option vector 3: processor options supported */ 660 #define OV3_FP 0x80 /* floating point */ 661 #define OV3_VMX 0x40 /* VMX/Altivec */ 662 #define OV3_DFP 0x20 /* decimal FP */ 663 664 /* Option vector 5: PAPR/OF options supported */ 665 #define OV5_LPAR 0x80 /* logical partitioning supported */ 666 #define OV5_SPLPAR 0x40 /* shared-processor LPAR supported */ 667 /* ibm,dynamic-reconfiguration-memory property supported */ 668 #define OV5_DRCONF_MEMORY 0x20 669 #define OV5_LARGE_PAGES 0x10 /* large pages supported */ 670 #define OV5_DONATE_DEDICATE_CPU 0x02 /* donate dedicated CPU support */ 671 /* PCIe/MSI support. Without MSI full PCIe is not supported */ 672 #ifdef CONFIG_PCI_MSI 673 #define OV5_MSI 0x01 /* PCIe/MSI support */ 674 #else 675 #define OV5_MSI 0x00 676 #endif /* CONFIG_PCI_MSI */ 677 #ifdef CONFIG_PPC_SMLPAR 678 #define OV5_CMO 0x80 /* Cooperative Memory Overcommitment */ 679 #else 680 #define OV5_CMO 0x00 681 #endif 682 #define OV5_TYPE1_AFFINITY 0x80 /* Type 1 NUMA affinity */ 683 684 /* Option Vector 6: IBM PAPR hints */ 685 #define OV6_LINUX 0x02 /* Linux is our OS */ 686 687 /* 688 * The architecture vector has an array of PVR mask/value pairs, 689 * followed by # option vectors - 1, followed by the option vectors. 690 */ 691 static unsigned char ibm_architecture_vec[] = { 692 W(0xfffe0000), W(0x003a0000), /* POWER5/POWER5+ */ 693 W(0xffff0000), W(0x003e0000), /* POWER6 */ 694 W(0xffff0000), W(0x003f0000), /* POWER7 */ 695 W(0xffffffff), W(0x0f000003), /* all 2.06-compliant */ 696 W(0xffffffff), W(0x0f000002), /* all 2.05-compliant */ 697 W(0xfffffffe), W(0x0f000001), /* all 2.04-compliant and earlier */ 698 6 - 1, /* 6 option vectors */ 699 700 /* option vector 1: processor architectures supported */ 701 3 - 2, /* length */ 702 0, /* don't ignore, don't halt */ 703 OV1_PPC_2_00 | OV1_PPC_2_01 | OV1_PPC_2_02 | OV1_PPC_2_03 | 704 OV1_PPC_2_04 | OV1_PPC_2_05 | OV1_PPC_2_06, 705 706 /* option vector 2: Open Firmware options supported */ 707 34 - 2, /* length */ 708 OV2_REAL_MODE, 709 0, 0, 710 W(0xffffffff), /* real_base */ 711 W(0xffffffff), /* real_size */ 712 W(0xffffffff), /* virt_base */ 713 W(0xffffffff), /* virt_size */ 714 W(0xffffffff), /* load_base */ 715 W(64), /* 64MB min RMA */ 716 W(0xffffffff), /* full client load */ 717 0, /* min RMA percentage of total RAM */ 718 48, /* max log_2(hash table size) */ 719 720 /* option vector 3: processor options supported */ 721 3 - 2, /* length */ 722 0, /* don't ignore, don't halt */ 723 OV3_FP | OV3_VMX | OV3_DFP, 724 725 /* option vector 4: IBM PAPR implementation */ 726 2 - 2, /* length */ 727 0, /* don't halt */ 728 729 /* option vector 5: PAPR/OF options */ 730 13 - 2, /* length */ 731 0, /* don't ignore, don't halt */ 732 OV5_LPAR | OV5_SPLPAR | OV5_LARGE_PAGES | OV5_DRCONF_MEMORY | 733 OV5_DONATE_DEDICATE_CPU | OV5_MSI, 734 0, 735 OV5_CMO, 736 OV5_TYPE1_AFFINITY, 737 0, 738 0, 739 0, 740 /* WARNING: The offset of the "number of cores" field below 741 * must match by the macro below. Update the definition if 742 * the structure layout changes. 743 */ 744 #define IBM_ARCH_VEC_NRCORES_OFFSET 100 745 W(NR_CPUS), /* number of cores supported */ 746 747 /* option vector 6: IBM PAPR hints */ 748 4 - 2, /* length */ 749 0, 750 0, 751 OV6_LINUX, 752 753 }; 754 755 /* Old method - ELF header with PT_NOTE sections */ 756 static struct fake_elf { 757 Elf32_Ehdr elfhdr; 758 Elf32_Phdr phdr[2]; 759 struct chrpnote { 760 u32 namesz; 761 u32 descsz; 762 u32 type; 763 char name[8]; /* "PowerPC" */ 764 struct chrpdesc { 765 u32 real_mode; 766 u32 real_base; 767 u32 real_size; 768 u32 virt_base; 769 u32 virt_size; 770 u32 load_base; 771 } chrpdesc; 772 } chrpnote; 773 struct rpanote { 774 u32 namesz; 775 u32 descsz; 776 u32 type; 777 char name[24]; /* "IBM,RPA-Client-Config" */ 778 struct rpadesc { 779 u32 lpar_affinity; 780 u32 min_rmo_size; 781 u32 min_rmo_percent; 782 u32 max_pft_size; 783 u32 splpar; 784 u32 min_load; 785 u32 new_mem_def; 786 u32 ignore_me; 787 } rpadesc; 788 } rpanote; 789 } fake_elf = { 790 .elfhdr = { 791 .e_ident = { 0x7f, 'E', 'L', 'F', 792 ELFCLASS32, ELFDATA2MSB, EV_CURRENT }, 793 .e_type = ET_EXEC, /* yeah right */ 794 .e_machine = EM_PPC, 795 .e_version = EV_CURRENT, 796 .e_phoff = offsetof(struct fake_elf, phdr), 797 .e_phentsize = sizeof(Elf32_Phdr), 798 .e_phnum = 2 799 }, 800 .phdr = { 801 [0] = { 802 .p_type = PT_NOTE, 803 .p_offset = offsetof(struct fake_elf, chrpnote), 804 .p_filesz = sizeof(struct chrpnote) 805 }, [1] = { 806 .p_type = PT_NOTE, 807 .p_offset = offsetof(struct fake_elf, rpanote), 808 .p_filesz = sizeof(struct rpanote) 809 } 810 }, 811 .chrpnote = { 812 .namesz = sizeof("PowerPC"), 813 .descsz = sizeof(struct chrpdesc), 814 .type = 0x1275, 815 .name = "PowerPC", 816 .chrpdesc = { 817 .real_mode = ~0U, /* ~0 means "don't care" */ 818 .real_base = ~0U, 819 .real_size = ~0U, 820 .virt_base = ~0U, 821 .virt_size = ~0U, 822 .load_base = ~0U 823 }, 824 }, 825 .rpanote = { 826 .namesz = sizeof("IBM,RPA-Client-Config"), 827 .descsz = sizeof(struct rpadesc), 828 .type = 0x12759999, 829 .name = "IBM,RPA-Client-Config", 830 .rpadesc = { 831 .lpar_affinity = 0, 832 .min_rmo_size = 64, /* in megabytes */ 833 .min_rmo_percent = 0, 834 .max_pft_size = 48, /* 2^48 bytes max PFT size */ 835 .splpar = 1, 836 .min_load = ~0U, 837 .new_mem_def = 0 838 } 839 } 840 }; 841 842 static int __init prom_count_smt_threads(void) 843 { 844 phandle node; 845 char type[64]; 846 unsigned int plen; 847 848 /* Pick up th first CPU node we can find */ 849 for (node = 0; prom_next_node(&node); ) { 850 type[0] = 0; 851 prom_getprop(node, "device_type", type, sizeof(type)); 852 853 if (strcmp(type, RELOC("cpu"))) 854 continue; 855 /* 856 * There is an entry for each smt thread, each entry being 857 * 4 bytes long. All cpus should have the same number of 858 * smt threads, so return after finding the first. 859 */ 860 plen = prom_getproplen(node, "ibm,ppc-interrupt-server#s"); 861 if (plen == PROM_ERROR) 862 break; 863 plen >>= 2; 864 prom_debug("Found %lu smt threads per core\n", (unsigned long)plen); 865 866 /* Sanity check */ 867 if (plen < 1 || plen > 64) { 868 prom_printf("Threads per core %lu out of bounds, assuming 1\n", 869 (unsigned long)plen); 870 return 1; 871 } 872 return plen; 873 } 874 prom_debug("No threads found, assuming 1 per core\n"); 875 876 return 1; 877 878 } 879 880 881 static void __init prom_send_capabilities(void) 882 { 883 ihandle elfloader, root; 884 prom_arg_t ret; 885 u32 *cores; 886 887 root = call_prom("open", 1, 1, ADDR("/")); 888 if (root != 0) { 889 /* We need to tell the FW about the number of cores we support. 890 * 891 * To do that, we count the number of threads on the first core 892 * (we assume this is the same for all cores) and use it to 893 * divide NR_CPUS. 894 */ 895 cores = (u32 *)PTRRELOC(&ibm_architecture_vec[IBM_ARCH_VEC_NRCORES_OFFSET]); 896 if (*cores != NR_CPUS) { 897 prom_printf("WARNING ! " 898 "ibm_architecture_vec structure inconsistent: %lu!\n", 899 *cores); 900 } else { 901 *cores = DIV_ROUND_UP(NR_CPUS, prom_count_smt_threads()); 902 prom_printf("Max number of cores passed to firmware: %lu (NR_CPUS = %lu)\n", 903 *cores, NR_CPUS); 904 } 905 906 /* try calling the ibm,client-architecture-support method */ 907 prom_printf("Calling ibm,client-architecture-support..."); 908 if (call_prom_ret("call-method", 3, 2, &ret, 909 ADDR("ibm,client-architecture-support"), 910 root, 911 ADDR(ibm_architecture_vec)) == 0) { 912 /* the call exists... */ 913 if (ret) 914 prom_printf("\nWARNING: ibm,client-architecture" 915 "-support call FAILED!\n"); 916 call_prom("close", 1, 0, root); 917 prom_printf(" done\n"); 918 return; 919 } 920 call_prom("close", 1, 0, root); 921 prom_printf(" not implemented\n"); 922 } 923 924 /* no ibm,client-architecture-support call, try the old way */ 925 elfloader = call_prom("open", 1, 1, ADDR("/packages/elf-loader")); 926 if (elfloader == 0) { 927 prom_printf("couldn't open /packages/elf-loader\n"); 928 return; 929 } 930 call_prom("call-method", 3, 1, ADDR("process-elf-header"), 931 elfloader, ADDR(&fake_elf)); 932 call_prom("close", 1, 0, elfloader); 933 } 934 #endif 935 936 /* 937 * Memory allocation strategy... our layout is normally: 938 * 939 * at 14Mb or more we have vmlinux, then a gap and initrd. In some 940 * rare cases, initrd might end up being before the kernel though. 941 * We assume this won't override the final kernel at 0, we have no 942 * provision to handle that in this version, but it should hopefully 943 * never happen. 944 * 945 * alloc_top is set to the top of RMO, eventually shrink down if the 946 * TCEs overlap 947 * 948 * alloc_bottom is set to the top of kernel/initrd 949 * 950 * from there, allocations are done this way : rtas is allocated 951 * topmost, and the device-tree is allocated from the bottom. We try 952 * to grow the device-tree allocation as we progress. If we can't, 953 * then we fail, we don't currently have a facility to restart 954 * elsewhere, but that shouldn't be necessary. 955 * 956 * Note that calls to reserve_mem have to be done explicitly, memory 957 * allocated with either alloc_up or alloc_down isn't automatically 958 * reserved. 959 */ 960 961 962 /* 963 * Allocates memory in the RMO upward from the kernel/initrd 964 * 965 * When align is 0, this is a special case, it means to allocate in place 966 * at the current location of alloc_bottom or fail (that is basically 967 * extending the previous allocation). Used for the device-tree flattening 968 */ 969 static unsigned long __init alloc_up(unsigned long size, unsigned long align) 970 { 971 unsigned long base = RELOC(alloc_bottom); 972 unsigned long addr = 0; 973 974 if (align) 975 base = _ALIGN_UP(base, align); 976 prom_debug("alloc_up(%x, %x)\n", size, align); 977 if (RELOC(ram_top) == 0) 978 prom_panic("alloc_up() called with mem not initialized\n"); 979 980 if (align) 981 base = _ALIGN_UP(RELOC(alloc_bottom), align); 982 else 983 base = RELOC(alloc_bottom); 984 985 for(; (base + size) <= RELOC(alloc_top); 986 base = _ALIGN_UP(base + 0x100000, align)) { 987 prom_debug(" trying: 0x%x\n\r", base); 988 addr = (unsigned long)prom_claim(base, size, 0); 989 if (addr != PROM_ERROR && addr != 0) 990 break; 991 addr = 0; 992 if (align == 0) 993 break; 994 } 995 if (addr == 0) 996 return 0; 997 RELOC(alloc_bottom) = addr; 998 999 prom_debug(" -> %x\n", addr); 1000 prom_debug(" alloc_bottom : %x\n", RELOC(alloc_bottom)); 1001 prom_debug(" alloc_top : %x\n", RELOC(alloc_top)); 1002 prom_debug(" alloc_top_hi : %x\n", RELOC(alloc_top_high)); 1003 prom_debug(" rmo_top : %x\n", RELOC(rmo_top)); 1004 prom_debug(" ram_top : %x\n", RELOC(ram_top)); 1005 1006 return addr; 1007 } 1008 1009 /* 1010 * Allocates memory downward, either from top of RMO, or if highmem 1011 * is set, from the top of RAM. Note that this one doesn't handle 1012 * failures. It does claim memory if highmem is not set. 1013 */ 1014 static unsigned long __init alloc_down(unsigned long size, unsigned long align, 1015 int highmem) 1016 { 1017 unsigned long base, addr = 0; 1018 1019 prom_debug("alloc_down(%x, %x, %s)\n", size, align, 1020 highmem ? RELOC("(high)") : RELOC("(low)")); 1021 if (RELOC(ram_top) == 0) 1022 prom_panic("alloc_down() called with mem not initialized\n"); 1023 1024 if (highmem) { 1025 /* Carve out storage for the TCE table. */ 1026 addr = _ALIGN_DOWN(RELOC(alloc_top_high) - size, align); 1027 if (addr <= RELOC(alloc_bottom)) 1028 return 0; 1029 /* Will we bump into the RMO ? If yes, check out that we 1030 * didn't overlap existing allocations there, if we did, 1031 * we are dead, we must be the first in town ! 1032 */ 1033 if (addr < RELOC(rmo_top)) { 1034 /* Good, we are first */ 1035 if (RELOC(alloc_top) == RELOC(rmo_top)) 1036 RELOC(alloc_top) = RELOC(rmo_top) = addr; 1037 else 1038 return 0; 1039 } 1040 RELOC(alloc_top_high) = addr; 1041 goto bail; 1042 } 1043 1044 base = _ALIGN_DOWN(RELOC(alloc_top) - size, align); 1045 for (; base > RELOC(alloc_bottom); 1046 base = _ALIGN_DOWN(base - 0x100000, align)) { 1047 prom_debug(" trying: 0x%x\n\r", base); 1048 addr = (unsigned long)prom_claim(base, size, 0); 1049 if (addr != PROM_ERROR && addr != 0) 1050 break; 1051 addr = 0; 1052 } 1053 if (addr == 0) 1054 return 0; 1055 RELOC(alloc_top) = addr; 1056 1057 bail: 1058 prom_debug(" -> %x\n", addr); 1059 prom_debug(" alloc_bottom : %x\n", RELOC(alloc_bottom)); 1060 prom_debug(" alloc_top : %x\n", RELOC(alloc_top)); 1061 prom_debug(" alloc_top_hi : %x\n", RELOC(alloc_top_high)); 1062 prom_debug(" rmo_top : %x\n", RELOC(rmo_top)); 1063 prom_debug(" ram_top : %x\n", RELOC(ram_top)); 1064 1065 return addr; 1066 } 1067 1068 /* 1069 * Parse a "reg" cell 1070 */ 1071 static unsigned long __init prom_next_cell(int s, cell_t **cellp) 1072 { 1073 cell_t *p = *cellp; 1074 unsigned long r = 0; 1075 1076 /* Ignore more than 2 cells */ 1077 while (s > sizeof(unsigned long) / 4) { 1078 p++; 1079 s--; 1080 } 1081 r = *p++; 1082 #ifdef CONFIG_PPC64 1083 if (s > 1) { 1084 r <<= 32; 1085 r |= *(p++); 1086 } 1087 #endif 1088 *cellp = p; 1089 return r; 1090 } 1091 1092 /* 1093 * Very dumb function for adding to the memory reserve list, but 1094 * we don't need anything smarter at this point 1095 * 1096 * XXX Eventually check for collisions. They should NEVER happen. 1097 * If problems seem to show up, it would be a good start to track 1098 * them down. 1099 */ 1100 static void __init reserve_mem(u64 base, u64 size) 1101 { 1102 u64 top = base + size; 1103 unsigned long cnt = RELOC(mem_reserve_cnt); 1104 1105 if (size == 0) 1106 return; 1107 1108 /* We need to always keep one empty entry so that we 1109 * have our terminator with "size" set to 0 since we are 1110 * dumb and just copy this entire array to the boot params 1111 */ 1112 base = _ALIGN_DOWN(base, PAGE_SIZE); 1113 top = _ALIGN_UP(top, PAGE_SIZE); 1114 size = top - base; 1115 1116 if (cnt >= (MEM_RESERVE_MAP_SIZE - 1)) 1117 prom_panic("Memory reserve map exhausted !\n"); 1118 RELOC(mem_reserve_map)[cnt].base = base; 1119 RELOC(mem_reserve_map)[cnt].size = size; 1120 RELOC(mem_reserve_cnt) = cnt + 1; 1121 } 1122 1123 /* 1124 * Initialize memory allocation mechanism, parse "memory" nodes and 1125 * obtain that way the top of memory and RMO to setup out local allocator 1126 */ 1127 static void __init prom_init_mem(void) 1128 { 1129 phandle node; 1130 char *path, type[64]; 1131 unsigned int plen; 1132 cell_t *p, *endp; 1133 struct prom_t *_prom = &RELOC(prom); 1134 u32 rac, rsc; 1135 1136 /* 1137 * We iterate the memory nodes to find 1138 * 1) top of RMO (first node) 1139 * 2) top of memory 1140 */ 1141 rac = 2; 1142 prom_getprop(_prom->root, "#address-cells", &rac, sizeof(rac)); 1143 rsc = 1; 1144 prom_getprop(_prom->root, "#size-cells", &rsc, sizeof(rsc)); 1145 prom_debug("root_addr_cells: %x\n", (unsigned long) rac); 1146 prom_debug("root_size_cells: %x\n", (unsigned long) rsc); 1147 1148 prom_debug("scanning memory:\n"); 1149 path = RELOC(prom_scratch); 1150 1151 for (node = 0; prom_next_node(&node); ) { 1152 type[0] = 0; 1153 prom_getprop(node, "device_type", type, sizeof(type)); 1154 1155 if (type[0] == 0) { 1156 /* 1157 * CHRP Longtrail machines have no device_type 1158 * on the memory node, so check the name instead... 1159 */ 1160 prom_getprop(node, "name", type, sizeof(type)); 1161 } 1162 if (strcmp(type, RELOC("memory"))) 1163 continue; 1164 1165 plen = prom_getprop(node, "reg", RELOC(regbuf), sizeof(regbuf)); 1166 if (plen > sizeof(regbuf)) { 1167 prom_printf("memory node too large for buffer !\n"); 1168 plen = sizeof(regbuf); 1169 } 1170 p = RELOC(regbuf); 1171 endp = p + (plen / sizeof(cell_t)); 1172 1173 #ifdef DEBUG_PROM 1174 memset(path, 0, PROM_SCRATCH_SIZE); 1175 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1); 1176 prom_debug(" node %s :\n", path); 1177 #endif /* DEBUG_PROM */ 1178 1179 while ((endp - p) >= (rac + rsc)) { 1180 unsigned long base, size; 1181 1182 base = prom_next_cell(rac, &p); 1183 size = prom_next_cell(rsc, &p); 1184 1185 if (size == 0) 1186 continue; 1187 prom_debug(" %x %x\n", base, size); 1188 if (base == 0 && (RELOC(of_platform) & PLATFORM_LPAR)) 1189 RELOC(rmo_top) = size; 1190 if ((base + size) > RELOC(ram_top)) 1191 RELOC(ram_top) = base + size; 1192 } 1193 } 1194 1195 RELOC(alloc_bottom) = PAGE_ALIGN((unsigned long)&RELOC(_end) + 0x4000); 1196 1197 /* Check if we have an initrd after the kernel, if we do move our bottom 1198 * point to after it 1199 */ 1200 if (RELOC(prom_initrd_start)) { 1201 if (RELOC(prom_initrd_end) > RELOC(alloc_bottom)) 1202 RELOC(alloc_bottom) = PAGE_ALIGN(RELOC(prom_initrd_end)); 1203 } 1204 1205 /* 1206 * If prom_memory_limit is set we reduce the upper limits *except* for 1207 * alloc_top_high. This must be the real top of RAM so we can put 1208 * TCE's up there. 1209 */ 1210 1211 RELOC(alloc_top_high) = RELOC(ram_top); 1212 1213 if (RELOC(prom_memory_limit)) { 1214 if (RELOC(prom_memory_limit) <= RELOC(alloc_bottom)) { 1215 prom_printf("Ignoring mem=%x <= alloc_bottom.\n", 1216 RELOC(prom_memory_limit)); 1217 RELOC(prom_memory_limit) = 0; 1218 } else if (RELOC(prom_memory_limit) >= RELOC(ram_top)) { 1219 prom_printf("Ignoring mem=%x >= ram_top.\n", 1220 RELOC(prom_memory_limit)); 1221 RELOC(prom_memory_limit) = 0; 1222 } else { 1223 RELOC(ram_top) = RELOC(prom_memory_limit); 1224 RELOC(rmo_top) = min(RELOC(rmo_top), RELOC(prom_memory_limit)); 1225 } 1226 } 1227 1228 /* 1229 * Setup our top alloc point, that is top of RMO or top of 1230 * segment 0 when running non-LPAR. 1231 * Some RS64 machines have buggy firmware where claims up at 1232 * 1GB fail. Cap at 768MB as a workaround. 1233 * Since 768MB is plenty of room, and we need to cap to something 1234 * reasonable on 32-bit, cap at 768MB on all machines. 1235 */ 1236 if (!RELOC(rmo_top)) 1237 RELOC(rmo_top) = RELOC(ram_top); 1238 RELOC(rmo_top) = min(0x30000000ul, RELOC(rmo_top)); 1239 RELOC(alloc_top) = RELOC(rmo_top); 1240 RELOC(alloc_top_high) = RELOC(ram_top); 1241 1242 prom_printf("memory layout at init:\n"); 1243 prom_printf(" memory_limit : %x (16 MB aligned)\n", RELOC(prom_memory_limit)); 1244 prom_printf(" alloc_bottom : %x\n", RELOC(alloc_bottom)); 1245 prom_printf(" alloc_top : %x\n", RELOC(alloc_top)); 1246 prom_printf(" alloc_top_hi : %x\n", RELOC(alloc_top_high)); 1247 prom_printf(" rmo_top : %x\n", RELOC(rmo_top)); 1248 prom_printf(" ram_top : %x\n", RELOC(ram_top)); 1249 } 1250 1251 1252 /* 1253 * Allocate room for and instantiate RTAS 1254 */ 1255 static void __init prom_instantiate_rtas(void) 1256 { 1257 phandle rtas_node; 1258 ihandle rtas_inst; 1259 u32 base, entry = 0; 1260 u32 size = 0; 1261 1262 prom_debug("prom_instantiate_rtas: start...\n"); 1263 1264 rtas_node = call_prom("finddevice", 1, 1, ADDR("/rtas")); 1265 prom_debug("rtas_node: %x\n", rtas_node); 1266 if (!PHANDLE_VALID(rtas_node)) 1267 return; 1268 1269 prom_getprop(rtas_node, "rtas-size", &size, sizeof(size)); 1270 if (size == 0) 1271 return; 1272 1273 base = alloc_down(size, PAGE_SIZE, 0); 1274 if (base == 0) { 1275 prom_printf("RTAS allocation failed !\n"); 1276 return; 1277 } 1278 1279 rtas_inst = call_prom("open", 1, 1, ADDR("/rtas")); 1280 if (!IHANDLE_VALID(rtas_inst)) { 1281 prom_printf("opening rtas package failed (%x)\n", rtas_inst); 1282 return; 1283 } 1284 1285 prom_printf("instantiating rtas at 0x%x...", base); 1286 1287 if (call_prom_ret("call-method", 3, 2, &entry, 1288 ADDR("instantiate-rtas"), 1289 rtas_inst, base) != 0 1290 || entry == 0) { 1291 prom_printf(" failed\n"); 1292 return; 1293 } 1294 prom_printf(" done\n"); 1295 1296 reserve_mem(base, size); 1297 1298 prom_setprop(rtas_node, "/rtas", "linux,rtas-base", 1299 &base, sizeof(base)); 1300 prom_setprop(rtas_node, "/rtas", "linux,rtas-entry", 1301 &entry, sizeof(entry)); 1302 1303 prom_debug("rtas base = 0x%x\n", base); 1304 prom_debug("rtas entry = 0x%x\n", entry); 1305 prom_debug("rtas size = 0x%x\n", (long)size); 1306 1307 prom_debug("prom_instantiate_rtas: end...\n"); 1308 } 1309 1310 #ifdef CONFIG_PPC64 1311 /* 1312 * Allocate room for and initialize TCE tables 1313 */ 1314 static void __init prom_initialize_tce_table(void) 1315 { 1316 phandle node; 1317 ihandle phb_node; 1318 char compatible[64], type[64], model[64]; 1319 char *path = RELOC(prom_scratch); 1320 u64 base, align; 1321 u32 minalign, minsize; 1322 u64 tce_entry, *tce_entryp; 1323 u64 local_alloc_top, local_alloc_bottom; 1324 u64 i; 1325 1326 if (RELOC(prom_iommu_off)) 1327 return; 1328 1329 prom_debug("starting prom_initialize_tce_table\n"); 1330 1331 /* Cache current top of allocs so we reserve a single block */ 1332 local_alloc_top = RELOC(alloc_top_high); 1333 local_alloc_bottom = local_alloc_top; 1334 1335 /* Search all nodes looking for PHBs. */ 1336 for (node = 0; prom_next_node(&node); ) { 1337 compatible[0] = 0; 1338 type[0] = 0; 1339 model[0] = 0; 1340 prom_getprop(node, "compatible", 1341 compatible, sizeof(compatible)); 1342 prom_getprop(node, "device_type", type, sizeof(type)); 1343 prom_getprop(node, "model", model, sizeof(model)); 1344 1345 if ((type[0] == 0) || (strstr(type, RELOC("pci")) == NULL)) 1346 continue; 1347 1348 /* Keep the old logic intact to avoid regression. */ 1349 if (compatible[0] != 0) { 1350 if ((strstr(compatible, RELOC("python")) == NULL) && 1351 (strstr(compatible, RELOC("Speedwagon")) == NULL) && 1352 (strstr(compatible, RELOC("Winnipeg")) == NULL)) 1353 continue; 1354 } else if (model[0] != 0) { 1355 if ((strstr(model, RELOC("ython")) == NULL) && 1356 (strstr(model, RELOC("peedwagon")) == NULL) && 1357 (strstr(model, RELOC("innipeg")) == NULL)) 1358 continue; 1359 } 1360 1361 if (prom_getprop(node, "tce-table-minalign", &minalign, 1362 sizeof(minalign)) == PROM_ERROR) 1363 minalign = 0; 1364 if (prom_getprop(node, "tce-table-minsize", &minsize, 1365 sizeof(minsize)) == PROM_ERROR) 1366 minsize = 4UL << 20; 1367 1368 /* 1369 * Even though we read what OF wants, we just set the table 1370 * size to 4 MB. This is enough to map 2GB of PCI DMA space. 1371 * By doing this, we avoid the pitfalls of trying to DMA to 1372 * MMIO space and the DMA alias hole. 1373 * 1374 * On POWER4, firmware sets the TCE region by assuming 1375 * each TCE table is 8MB. Using this memory for anything 1376 * else will impact performance, so we always allocate 8MB. 1377 * Anton 1378 */ 1379 if (__is_processor(PV_POWER4) || __is_processor(PV_POWER4p)) 1380 minsize = 8UL << 20; 1381 else 1382 minsize = 4UL << 20; 1383 1384 /* Align to the greater of the align or size */ 1385 align = max(minalign, minsize); 1386 base = alloc_down(minsize, align, 1); 1387 if (base == 0) 1388 prom_panic("ERROR, cannot find space for TCE table.\n"); 1389 if (base < local_alloc_bottom) 1390 local_alloc_bottom = base; 1391 1392 /* It seems OF doesn't null-terminate the path :-( */ 1393 memset(path, 0, PROM_SCRATCH_SIZE); 1394 /* Call OF to setup the TCE hardware */ 1395 if (call_prom("package-to-path", 3, 1, node, 1396 path, PROM_SCRATCH_SIZE-1) == PROM_ERROR) { 1397 prom_printf("package-to-path failed\n"); 1398 } 1399 1400 /* Save away the TCE table attributes for later use. */ 1401 prom_setprop(node, path, "linux,tce-base", &base, sizeof(base)); 1402 prom_setprop(node, path, "linux,tce-size", &minsize, sizeof(minsize)); 1403 1404 prom_debug("TCE table: %s\n", path); 1405 prom_debug("\tnode = 0x%x\n", node); 1406 prom_debug("\tbase = 0x%x\n", base); 1407 prom_debug("\tsize = 0x%x\n", minsize); 1408 1409 /* Initialize the table to have a one-to-one mapping 1410 * over the allocated size. 1411 */ 1412 tce_entryp = (u64 *)base; 1413 for (i = 0; i < (minsize >> 3) ;tce_entryp++, i++) { 1414 tce_entry = (i << PAGE_SHIFT); 1415 tce_entry |= 0x3; 1416 *tce_entryp = tce_entry; 1417 } 1418 1419 prom_printf("opening PHB %s", path); 1420 phb_node = call_prom("open", 1, 1, path); 1421 if (phb_node == 0) 1422 prom_printf("... failed\n"); 1423 else 1424 prom_printf("... done\n"); 1425 1426 call_prom("call-method", 6, 0, ADDR("set-64-bit-addressing"), 1427 phb_node, -1, minsize, 1428 (u32) base, (u32) (base >> 32)); 1429 call_prom("close", 1, 0, phb_node); 1430 } 1431 1432 reserve_mem(local_alloc_bottom, local_alloc_top - local_alloc_bottom); 1433 1434 /* These are only really needed if there is a memory limit in 1435 * effect, but we don't know so export them always. */ 1436 RELOC(prom_tce_alloc_start) = local_alloc_bottom; 1437 RELOC(prom_tce_alloc_end) = local_alloc_top; 1438 1439 /* Flag the first invalid entry */ 1440 prom_debug("ending prom_initialize_tce_table\n"); 1441 } 1442 #endif 1443 1444 /* 1445 * With CHRP SMP we need to use the OF to start the other processors. 1446 * We can't wait until smp_boot_cpus (the OF is trashed by then) 1447 * so we have to put the processors into a holding pattern controlled 1448 * by the kernel (not OF) before we destroy the OF. 1449 * 1450 * This uses a chunk of low memory, puts some holding pattern 1451 * code there and sends the other processors off to there until 1452 * smp_boot_cpus tells them to do something. The holding pattern 1453 * checks that address until its cpu # is there, when it is that 1454 * cpu jumps to __secondary_start(). smp_boot_cpus() takes care 1455 * of setting those values. 1456 * 1457 * We also use physical address 0x4 here to tell when a cpu 1458 * is in its holding pattern code. 1459 * 1460 * -- Cort 1461 */ 1462 /* 1463 * We want to reference the copy of __secondary_hold_* in the 1464 * 0 - 0x100 address range 1465 */ 1466 #define LOW_ADDR(x) (((unsigned long) &(x)) & 0xff) 1467 1468 static void __init prom_hold_cpus(void) 1469 { 1470 unsigned long i; 1471 unsigned int reg; 1472 phandle node; 1473 char type[64]; 1474 struct prom_t *_prom = &RELOC(prom); 1475 unsigned long *spinloop 1476 = (void *) LOW_ADDR(__secondary_hold_spinloop); 1477 unsigned long *acknowledge 1478 = (void *) LOW_ADDR(__secondary_hold_acknowledge); 1479 unsigned long secondary_hold = LOW_ADDR(__secondary_hold); 1480 1481 prom_debug("prom_hold_cpus: start...\n"); 1482 prom_debug(" 1) spinloop = 0x%x\n", (unsigned long)spinloop); 1483 prom_debug(" 1) *spinloop = 0x%x\n", *spinloop); 1484 prom_debug(" 1) acknowledge = 0x%x\n", 1485 (unsigned long)acknowledge); 1486 prom_debug(" 1) *acknowledge = 0x%x\n", *acknowledge); 1487 prom_debug(" 1) secondary_hold = 0x%x\n", secondary_hold); 1488 1489 /* Set the common spinloop variable, so all of the secondary cpus 1490 * will block when they are awakened from their OF spinloop. 1491 * This must occur for both SMP and non SMP kernels, since OF will 1492 * be trashed when we move the kernel. 1493 */ 1494 *spinloop = 0; 1495 1496 /* look for cpus */ 1497 for (node = 0; prom_next_node(&node); ) { 1498 type[0] = 0; 1499 prom_getprop(node, "device_type", type, sizeof(type)); 1500 if (strcmp(type, RELOC("cpu")) != 0) 1501 continue; 1502 1503 /* Skip non-configured cpus. */ 1504 if (prom_getprop(node, "status", type, sizeof(type)) > 0) 1505 if (strcmp(type, RELOC("okay")) != 0) 1506 continue; 1507 1508 reg = -1; 1509 prom_getprop(node, "reg", ®, sizeof(reg)); 1510 1511 prom_debug("cpu hw idx = %lu\n", reg); 1512 1513 /* Init the acknowledge var which will be reset by 1514 * the secondary cpu when it awakens from its OF 1515 * spinloop. 1516 */ 1517 *acknowledge = (unsigned long)-1; 1518 1519 if (reg != _prom->cpu) { 1520 /* Primary Thread of non-boot cpu */ 1521 prom_printf("starting cpu hw idx %lu... ", reg); 1522 call_prom("start-cpu", 3, 0, node, 1523 secondary_hold, reg); 1524 1525 for (i = 0; (i < 100000000) && 1526 (*acknowledge == ((unsigned long)-1)); i++ ) 1527 mb(); 1528 1529 if (*acknowledge == reg) 1530 prom_printf("done\n"); 1531 else 1532 prom_printf("failed: %x\n", *acknowledge); 1533 } 1534 #ifdef CONFIG_SMP 1535 else 1536 prom_printf("boot cpu hw idx %lu\n", reg); 1537 #endif /* CONFIG_SMP */ 1538 } 1539 1540 prom_debug("prom_hold_cpus: end...\n"); 1541 } 1542 1543 1544 static void __init prom_init_client_services(unsigned long pp) 1545 { 1546 struct prom_t *_prom = &RELOC(prom); 1547 1548 /* Get a handle to the prom entry point before anything else */ 1549 RELOC(prom_entry) = pp; 1550 1551 /* get a handle for the stdout device */ 1552 _prom->chosen = call_prom("finddevice", 1, 1, ADDR("/chosen")); 1553 if (!PHANDLE_VALID(_prom->chosen)) 1554 prom_panic("cannot find chosen"); /* msg won't be printed :( */ 1555 1556 /* get device tree root */ 1557 _prom->root = call_prom("finddevice", 1, 1, ADDR("/")); 1558 if (!PHANDLE_VALID(_prom->root)) 1559 prom_panic("cannot find device tree root"); /* msg won't be printed :( */ 1560 1561 _prom->mmumap = 0; 1562 } 1563 1564 #ifdef CONFIG_PPC32 1565 /* 1566 * For really old powermacs, we need to map things we claim. 1567 * For that, we need the ihandle of the mmu. 1568 * Also, on the longtrail, we need to work around other bugs. 1569 */ 1570 static void __init prom_find_mmu(void) 1571 { 1572 struct prom_t *_prom = &RELOC(prom); 1573 phandle oprom; 1574 char version[64]; 1575 1576 oprom = call_prom("finddevice", 1, 1, ADDR("/openprom")); 1577 if (!PHANDLE_VALID(oprom)) 1578 return; 1579 if (prom_getprop(oprom, "model", version, sizeof(version)) <= 0) 1580 return; 1581 version[sizeof(version) - 1] = 0; 1582 /* XXX might need to add other versions here */ 1583 if (strcmp(version, "Open Firmware, 1.0.5") == 0) 1584 of_workarounds = OF_WA_CLAIM; 1585 else if (strncmp(version, "FirmWorks,3.", 12) == 0) { 1586 of_workarounds = OF_WA_CLAIM | OF_WA_LONGTRAIL; 1587 call_prom("interpret", 1, 1, "dev /memory 0 to allow-reclaim"); 1588 } else 1589 return; 1590 _prom->memory = call_prom("open", 1, 1, ADDR("/memory")); 1591 prom_getprop(_prom->chosen, "mmu", &_prom->mmumap, 1592 sizeof(_prom->mmumap)); 1593 if (!IHANDLE_VALID(_prom->memory) || !IHANDLE_VALID(_prom->mmumap)) 1594 of_workarounds &= ~OF_WA_CLAIM; /* hmmm */ 1595 } 1596 #else 1597 #define prom_find_mmu() 1598 #endif 1599 1600 static void __init prom_init_stdout(void) 1601 { 1602 struct prom_t *_prom = &RELOC(prom); 1603 char *path = RELOC(of_stdout_device); 1604 char type[16]; 1605 u32 val; 1606 1607 if (prom_getprop(_prom->chosen, "stdout", &val, sizeof(val)) <= 0) 1608 prom_panic("cannot find stdout"); 1609 1610 _prom->stdout = val; 1611 1612 /* Get the full OF pathname of the stdout device */ 1613 memset(path, 0, 256); 1614 call_prom("instance-to-path", 3, 1, _prom->stdout, path, 255); 1615 val = call_prom("instance-to-package", 1, 1, _prom->stdout); 1616 prom_setprop(_prom->chosen, "/chosen", "linux,stdout-package", 1617 &val, sizeof(val)); 1618 prom_printf("OF stdout device is: %s\n", RELOC(of_stdout_device)); 1619 prom_setprop(_prom->chosen, "/chosen", "linux,stdout-path", 1620 path, strlen(path) + 1); 1621 1622 /* If it's a display, note it */ 1623 memset(type, 0, sizeof(type)); 1624 prom_getprop(val, "device_type", type, sizeof(type)); 1625 if (strcmp(type, RELOC("display")) == 0) 1626 prom_setprop(val, path, "linux,boot-display", NULL, 0); 1627 } 1628 1629 static void __init prom_close_stdin(void) 1630 { 1631 struct prom_t *_prom = &RELOC(prom); 1632 ihandle val; 1633 1634 if (prom_getprop(_prom->chosen, "stdin", &val, sizeof(val)) > 0) 1635 call_prom("close", 1, 0, val); 1636 } 1637 1638 static int __init prom_find_machine_type(void) 1639 { 1640 struct prom_t *_prom = &RELOC(prom); 1641 char compat[256]; 1642 int len, i = 0; 1643 #ifdef CONFIG_PPC64 1644 phandle rtas; 1645 int x; 1646 #endif 1647 1648 /* Look for a PowerMac */ 1649 len = prom_getprop(_prom->root, "compatible", 1650 compat, sizeof(compat)-1); 1651 if (len > 0) { 1652 compat[len] = 0; 1653 while (i < len) { 1654 char *p = &compat[i]; 1655 int sl = strlen(p); 1656 if (sl == 0) 1657 break; 1658 if (strstr(p, RELOC("Power Macintosh")) || 1659 strstr(p, RELOC("MacRISC"))) 1660 return PLATFORM_POWERMAC; 1661 #ifdef CONFIG_PPC64 1662 /* We must make sure we don't detect the IBM Cell 1663 * blades as pSeries due to some firmware issues, 1664 * so we do it here. 1665 */ 1666 if (strstr(p, RELOC("IBM,CBEA")) || 1667 strstr(p, RELOC("IBM,CPBW-1.0"))) 1668 return PLATFORM_GENERIC; 1669 #endif /* CONFIG_PPC64 */ 1670 i += sl + 1; 1671 } 1672 } 1673 #ifdef CONFIG_PPC64 1674 /* If not a mac, try to figure out if it's an IBM pSeries or any other 1675 * PAPR compliant platform. We assume it is if : 1676 * - /device_type is "chrp" (please, do NOT use that for future 1677 * non-IBM designs ! 1678 * - it has /rtas 1679 */ 1680 len = prom_getprop(_prom->root, "device_type", 1681 compat, sizeof(compat)-1); 1682 if (len <= 0) 1683 return PLATFORM_GENERIC; 1684 if (strcmp(compat, RELOC("chrp"))) 1685 return PLATFORM_GENERIC; 1686 1687 /* Default to pSeries. We need to know if we are running LPAR */ 1688 rtas = call_prom("finddevice", 1, 1, ADDR("/rtas")); 1689 if (!PHANDLE_VALID(rtas)) 1690 return PLATFORM_GENERIC; 1691 x = prom_getproplen(rtas, "ibm,hypertas-functions"); 1692 if (x != PROM_ERROR) { 1693 prom_debug("Hypertas detected, assuming LPAR !\n"); 1694 return PLATFORM_PSERIES_LPAR; 1695 } 1696 return PLATFORM_PSERIES; 1697 #else 1698 return PLATFORM_GENERIC; 1699 #endif 1700 } 1701 1702 static int __init prom_set_color(ihandle ih, int i, int r, int g, int b) 1703 { 1704 return call_prom("call-method", 6, 1, ADDR("color!"), ih, i, b, g, r); 1705 } 1706 1707 /* 1708 * If we have a display that we don't know how to drive, 1709 * we will want to try to execute OF's open method for it 1710 * later. However, OF will probably fall over if we do that 1711 * we've taken over the MMU. 1712 * So we check whether we will need to open the display, 1713 * and if so, open it now. 1714 */ 1715 static void __init prom_check_displays(void) 1716 { 1717 char type[16], *path; 1718 phandle node; 1719 ihandle ih; 1720 int i; 1721 1722 static unsigned char default_colors[] = { 1723 0x00, 0x00, 0x00, 1724 0x00, 0x00, 0xaa, 1725 0x00, 0xaa, 0x00, 1726 0x00, 0xaa, 0xaa, 1727 0xaa, 0x00, 0x00, 1728 0xaa, 0x00, 0xaa, 1729 0xaa, 0xaa, 0x00, 1730 0xaa, 0xaa, 0xaa, 1731 0x55, 0x55, 0x55, 1732 0x55, 0x55, 0xff, 1733 0x55, 0xff, 0x55, 1734 0x55, 0xff, 0xff, 1735 0xff, 0x55, 0x55, 1736 0xff, 0x55, 0xff, 1737 0xff, 0xff, 0x55, 1738 0xff, 0xff, 0xff 1739 }; 1740 const unsigned char *clut; 1741 1742 prom_debug("Looking for displays\n"); 1743 for (node = 0; prom_next_node(&node); ) { 1744 memset(type, 0, sizeof(type)); 1745 prom_getprop(node, "device_type", type, sizeof(type)); 1746 if (strcmp(type, RELOC("display")) != 0) 1747 continue; 1748 1749 /* It seems OF doesn't null-terminate the path :-( */ 1750 path = RELOC(prom_scratch); 1751 memset(path, 0, PROM_SCRATCH_SIZE); 1752 1753 /* 1754 * leave some room at the end of the path for appending extra 1755 * arguments 1756 */ 1757 if (call_prom("package-to-path", 3, 1, node, path, 1758 PROM_SCRATCH_SIZE-10) == PROM_ERROR) 1759 continue; 1760 prom_printf("found display : %s, opening... ", path); 1761 1762 ih = call_prom("open", 1, 1, path); 1763 if (ih == 0) { 1764 prom_printf("failed\n"); 1765 continue; 1766 } 1767 1768 /* Success */ 1769 prom_printf("done\n"); 1770 prom_setprop(node, path, "linux,opened", NULL, 0); 1771 1772 /* Setup a usable color table when the appropriate 1773 * method is available. Should update this to set-colors */ 1774 clut = RELOC(default_colors); 1775 for (i = 0; i < 32; i++, clut += 3) 1776 if (prom_set_color(ih, i, clut[0], clut[1], 1777 clut[2]) != 0) 1778 break; 1779 1780 #ifdef CONFIG_LOGO_LINUX_CLUT224 1781 clut = PTRRELOC(RELOC(logo_linux_clut224.clut)); 1782 for (i = 0; i < RELOC(logo_linux_clut224.clutsize); i++, clut += 3) 1783 if (prom_set_color(ih, i + 32, clut[0], clut[1], 1784 clut[2]) != 0) 1785 break; 1786 #endif /* CONFIG_LOGO_LINUX_CLUT224 */ 1787 } 1788 } 1789 1790 1791 /* Return (relocated) pointer to this much memory: moves initrd if reqd. */ 1792 static void __init *make_room(unsigned long *mem_start, unsigned long *mem_end, 1793 unsigned long needed, unsigned long align) 1794 { 1795 void *ret; 1796 1797 *mem_start = _ALIGN(*mem_start, align); 1798 while ((*mem_start + needed) > *mem_end) { 1799 unsigned long room, chunk; 1800 1801 prom_debug("Chunk exhausted, claiming more at %x...\n", 1802 RELOC(alloc_bottom)); 1803 room = RELOC(alloc_top) - RELOC(alloc_bottom); 1804 if (room > DEVTREE_CHUNK_SIZE) 1805 room = DEVTREE_CHUNK_SIZE; 1806 if (room < PAGE_SIZE) 1807 prom_panic("No memory for flatten_device_tree (no room)"); 1808 chunk = alloc_up(room, 0); 1809 if (chunk == 0) 1810 prom_panic("No memory for flatten_device_tree (claim failed)"); 1811 *mem_end = RELOC(alloc_top); 1812 } 1813 1814 ret = (void *)*mem_start; 1815 *mem_start += needed; 1816 1817 return ret; 1818 } 1819 1820 #define dt_push_token(token, mem_start, mem_end) \ 1821 do { *((u32 *)make_room(mem_start, mem_end, 4, 4)) = token; } while(0) 1822 1823 static unsigned long __init dt_find_string(char *str) 1824 { 1825 char *s, *os; 1826 1827 s = os = (char *)RELOC(dt_string_start); 1828 s += 4; 1829 while (s < (char *)RELOC(dt_string_end)) { 1830 if (strcmp(s, str) == 0) 1831 return s - os; 1832 s += strlen(s) + 1; 1833 } 1834 return 0; 1835 } 1836 1837 /* 1838 * The Open Firmware 1275 specification states properties must be 31 bytes or 1839 * less, however not all firmwares obey this. Make it 64 bytes to be safe. 1840 */ 1841 #define MAX_PROPERTY_NAME 64 1842 1843 static void __init scan_dt_build_strings(phandle node, 1844 unsigned long *mem_start, 1845 unsigned long *mem_end) 1846 { 1847 char *prev_name, *namep, *sstart; 1848 unsigned long soff; 1849 phandle child; 1850 1851 sstart = (char *)RELOC(dt_string_start); 1852 1853 /* get and store all property names */ 1854 prev_name = RELOC(""); 1855 for (;;) { 1856 /* 64 is max len of name including nul. */ 1857 namep = make_room(mem_start, mem_end, MAX_PROPERTY_NAME, 1); 1858 if (call_prom("nextprop", 3, 1, node, prev_name, namep) != 1) { 1859 /* No more nodes: unwind alloc */ 1860 *mem_start = (unsigned long)namep; 1861 break; 1862 } 1863 1864 /* skip "name" */ 1865 if (strcmp(namep, RELOC("name")) == 0) { 1866 *mem_start = (unsigned long)namep; 1867 prev_name = RELOC("name"); 1868 continue; 1869 } 1870 /* get/create string entry */ 1871 soff = dt_find_string(namep); 1872 if (soff != 0) { 1873 *mem_start = (unsigned long)namep; 1874 namep = sstart + soff; 1875 } else { 1876 /* Trim off some if we can */ 1877 *mem_start = (unsigned long)namep + strlen(namep) + 1; 1878 RELOC(dt_string_end) = *mem_start; 1879 } 1880 prev_name = namep; 1881 } 1882 1883 /* do all our children */ 1884 child = call_prom("child", 1, 1, node); 1885 while (child != 0) { 1886 scan_dt_build_strings(child, mem_start, mem_end); 1887 child = call_prom("peer", 1, 1, child); 1888 } 1889 } 1890 1891 static void __init scan_dt_build_struct(phandle node, unsigned long *mem_start, 1892 unsigned long *mem_end) 1893 { 1894 phandle child; 1895 char *namep, *prev_name, *sstart, *p, *ep, *lp, *path; 1896 unsigned long soff; 1897 unsigned char *valp; 1898 static char pname[MAX_PROPERTY_NAME]; 1899 int l, room; 1900 1901 dt_push_token(OF_DT_BEGIN_NODE, mem_start, mem_end); 1902 1903 /* get the node's full name */ 1904 namep = (char *)*mem_start; 1905 room = *mem_end - *mem_start; 1906 if (room > 255) 1907 room = 255; 1908 l = call_prom("package-to-path", 3, 1, node, namep, room); 1909 if (l >= 0) { 1910 /* Didn't fit? Get more room. */ 1911 if (l >= room) { 1912 if (l >= *mem_end - *mem_start) 1913 namep = make_room(mem_start, mem_end, l+1, 1); 1914 call_prom("package-to-path", 3, 1, node, namep, l); 1915 } 1916 namep[l] = '\0'; 1917 1918 /* Fixup an Apple bug where they have bogus \0 chars in the 1919 * middle of the path in some properties, and extract 1920 * the unit name (everything after the last '/'). 1921 */ 1922 for (lp = p = namep, ep = namep + l; p < ep; p++) { 1923 if (*p == '/') 1924 lp = namep; 1925 else if (*p != 0) 1926 *lp++ = *p; 1927 } 1928 *lp = 0; 1929 *mem_start = _ALIGN((unsigned long)lp + 1, 4); 1930 } 1931 1932 /* get it again for debugging */ 1933 path = RELOC(prom_scratch); 1934 memset(path, 0, PROM_SCRATCH_SIZE); 1935 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1); 1936 1937 /* get and store all properties */ 1938 prev_name = RELOC(""); 1939 sstart = (char *)RELOC(dt_string_start); 1940 for (;;) { 1941 if (call_prom("nextprop", 3, 1, node, prev_name, 1942 RELOC(pname)) != 1) 1943 break; 1944 1945 /* skip "name" */ 1946 if (strcmp(RELOC(pname), RELOC("name")) == 0) { 1947 prev_name = RELOC("name"); 1948 continue; 1949 } 1950 1951 /* find string offset */ 1952 soff = dt_find_string(RELOC(pname)); 1953 if (soff == 0) { 1954 prom_printf("WARNING: Can't find string index for" 1955 " <%s>, node %s\n", RELOC(pname), path); 1956 break; 1957 } 1958 prev_name = sstart + soff; 1959 1960 /* get length */ 1961 l = call_prom("getproplen", 2, 1, node, RELOC(pname)); 1962 1963 /* sanity checks */ 1964 if (l == PROM_ERROR) 1965 continue; 1966 if (l > MAX_PROPERTY_LENGTH) { 1967 prom_printf("WARNING: ignoring large property "); 1968 /* It seems OF doesn't null-terminate the path :-( */ 1969 prom_printf("[%s] ", path); 1970 prom_printf("%s length 0x%x\n", RELOC(pname), l); 1971 continue; 1972 } 1973 1974 /* push property head */ 1975 dt_push_token(OF_DT_PROP, mem_start, mem_end); 1976 dt_push_token(l, mem_start, mem_end); 1977 dt_push_token(soff, mem_start, mem_end); 1978 1979 /* push property content */ 1980 valp = make_room(mem_start, mem_end, l, 4); 1981 call_prom("getprop", 4, 1, node, RELOC(pname), valp, l); 1982 *mem_start = _ALIGN(*mem_start, 4); 1983 } 1984 1985 /* Add a "linux,phandle" property. */ 1986 soff = dt_find_string(RELOC("linux,phandle")); 1987 if (soff == 0) 1988 prom_printf("WARNING: Can't find string index for" 1989 " <linux-phandle> node %s\n", path); 1990 else { 1991 dt_push_token(OF_DT_PROP, mem_start, mem_end); 1992 dt_push_token(4, mem_start, mem_end); 1993 dt_push_token(soff, mem_start, mem_end); 1994 valp = make_room(mem_start, mem_end, 4, 4); 1995 *(u32 *)valp = node; 1996 } 1997 1998 /* do all our children */ 1999 child = call_prom("child", 1, 1, node); 2000 while (child != 0) { 2001 scan_dt_build_struct(child, mem_start, mem_end); 2002 child = call_prom("peer", 1, 1, child); 2003 } 2004 2005 dt_push_token(OF_DT_END_NODE, mem_start, mem_end); 2006 } 2007 2008 static void __init flatten_device_tree(void) 2009 { 2010 phandle root; 2011 unsigned long mem_start, mem_end, room; 2012 struct boot_param_header *hdr; 2013 struct prom_t *_prom = &RELOC(prom); 2014 char *namep; 2015 u64 *rsvmap; 2016 2017 /* 2018 * Check how much room we have between alloc top & bottom (+/- a 2019 * few pages), crop to 4Mb, as this is our "chuck" size 2020 */ 2021 room = RELOC(alloc_top) - RELOC(alloc_bottom) - 0x4000; 2022 if (room > DEVTREE_CHUNK_SIZE) 2023 room = DEVTREE_CHUNK_SIZE; 2024 prom_debug("starting device tree allocs at %x\n", RELOC(alloc_bottom)); 2025 2026 /* Now try to claim that */ 2027 mem_start = (unsigned long)alloc_up(room, PAGE_SIZE); 2028 if (mem_start == 0) 2029 prom_panic("Can't allocate initial device-tree chunk\n"); 2030 mem_end = RELOC(alloc_top); 2031 2032 /* Get root of tree */ 2033 root = call_prom("peer", 1, 1, (phandle)0); 2034 if (root == (phandle)0) 2035 prom_panic ("couldn't get device tree root\n"); 2036 2037 /* Build header and make room for mem rsv map */ 2038 mem_start = _ALIGN(mem_start, 4); 2039 hdr = make_room(&mem_start, &mem_end, 2040 sizeof(struct boot_param_header), 4); 2041 RELOC(dt_header_start) = (unsigned long)hdr; 2042 rsvmap = make_room(&mem_start, &mem_end, sizeof(mem_reserve_map), 8); 2043 2044 /* Start of strings */ 2045 mem_start = PAGE_ALIGN(mem_start); 2046 RELOC(dt_string_start) = mem_start; 2047 mem_start += 4; /* hole */ 2048 2049 /* Add "linux,phandle" in there, we'll need it */ 2050 namep = make_room(&mem_start, &mem_end, 16, 1); 2051 strcpy(namep, RELOC("linux,phandle")); 2052 mem_start = (unsigned long)namep + strlen(namep) + 1; 2053 2054 /* Build string array */ 2055 prom_printf("Building dt strings...\n"); 2056 scan_dt_build_strings(root, &mem_start, &mem_end); 2057 RELOC(dt_string_end) = mem_start; 2058 2059 /* Build structure */ 2060 mem_start = PAGE_ALIGN(mem_start); 2061 RELOC(dt_struct_start) = mem_start; 2062 prom_printf("Building dt structure...\n"); 2063 scan_dt_build_struct(root, &mem_start, &mem_end); 2064 dt_push_token(OF_DT_END, &mem_start, &mem_end); 2065 RELOC(dt_struct_end) = PAGE_ALIGN(mem_start); 2066 2067 /* Finish header */ 2068 hdr->boot_cpuid_phys = _prom->cpu; 2069 hdr->magic = OF_DT_HEADER; 2070 hdr->totalsize = RELOC(dt_struct_end) - RELOC(dt_header_start); 2071 hdr->off_dt_struct = RELOC(dt_struct_start) - RELOC(dt_header_start); 2072 hdr->off_dt_strings = RELOC(dt_string_start) - RELOC(dt_header_start); 2073 hdr->dt_strings_size = RELOC(dt_string_end) - RELOC(dt_string_start); 2074 hdr->off_mem_rsvmap = ((unsigned long)rsvmap) - RELOC(dt_header_start); 2075 hdr->version = OF_DT_VERSION; 2076 /* Version 16 is not backward compatible */ 2077 hdr->last_comp_version = 0x10; 2078 2079 /* Copy the reserve map in */ 2080 memcpy(rsvmap, RELOC(mem_reserve_map), sizeof(mem_reserve_map)); 2081 2082 #ifdef DEBUG_PROM 2083 { 2084 int i; 2085 prom_printf("reserved memory map:\n"); 2086 for (i = 0; i < RELOC(mem_reserve_cnt); i++) 2087 prom_printf(" %x - %x\n", 2088 RELOC(mem_reserve_map)[i].base, 2089 RELOC(mem_reserve_map)[i].size); 2090 } 2091 #endif 2092 /* Bump mem_reserve_cnt to cause further reservations to fail 2093 * since it's too late. 2094 */ 2095 RELOC(mem_reserve_cnt) = MEM_RESERVE_MAP_SIZE; 2096 2097 prom_printf("Device tree strings 0x%x -> 0x%x\n", 2098 RELOC(dt_string_start), RELOC(dt_string_end)); 2099 prom_printf("Device tree struct 0x%x -> 0x%x\n", 2100 RELOC(dt_struct_start), RELOC(dt_struct_end)); 2101 2102 } 2103 2104 #ifdef CONFIG_PPC_MAPLE 2105 /* PIBS Version 1.05.0000 04/26/2005 has an incorrect /ht/isa/ranges property. 2106 * The values are bad, and it doesn't even have the right number of cells. */ 2107 static void __init fixup_device_tree_maple(void) 2108 { 2109 phandle isa; 2110 u32 rloc = 0x01002000; /* IO space; PCI device = 4 */ 2111 u32 isa_ranges[6]; 2112 char *name; 2113 2114 name = "/ht@0/isa@4"; 2115 isa = call_prom("finddevice", 1, 1, ADDR(name)); 2116 if (!PHANDLE_VALID(isa)) { 2117 name = "/ht@0/isa@6"; 2118 isa = call_prom("finddevice", 1, 1, ADDR(name)); 2119 rloc = 0x01003000; /* IO space; PCI device = 6 */ 2120 } 2121 if (!PHANDLE_VALID(isa)) 2122 return; 2123 2124 if (prom_getproplen(isa, "ranges") != 12) 2125 return; 2126 if (prom_getprop(isa, "ranges", isa_ranges, sizeof(isa_ranges)) 2127 == PROM_ERROR) 2128 return; 2129 2130 if (isa_ranges[0] != 0x1 || 2131 isa_ranges[1] != 0xf4000000 || 2132 isa_ranges[2] != 0x00010000) 2133 return; 2134 2135 prom_printf("Fixing up bogus ISA range on Maple/Apache...\n"); 2136 2137 isa_ranges[0] = 0x1; 2138 isa_ranges[1] = 0x0; 2139 isa_ranges[2] = rloc; 2140 isa_ranges[3] = 0x0; 2141 isa_ranges[4] = 0x0; 2142 isa_ranges[5] = 0x00010000; 2143 prom_setprop(isa, name, "ranges", 2144 isa_ranges, sizeof(isa_ranges)); 2145 } 2146 2147 #define CPC925_MC_START 0xf8000000 2148 #define CPC925_MC_LENGTH 0x1000000 2149 /* The values for memory-controller don't have right number of cells */ 2150 static void __init fixup_device_tree_maple_memory_controller(void) 2151 { 2152 phandle mc; 2153 u32 mc_reg[4]; 2154 char *name = "/hostbridge@f8000000"; 2155 struct prom_t *_prom = &RELOC(prom); 2156 u32 ac, sc; 2157 2158 mc = call_prom("finddevice", 1, 1, ADDR(name)); 2159 if (!PHANDLE_VALID(mc)) 2160 return; 2161 2162 if (prom_getproplen(mc, "reg") != 8) 2163 return; 2164 2165 prom_getprop(_prom->root, "#address-cells", &ac, sizeof(ac)); 2166 prom_getprop(_prom->root, "#size-cells", &sc, sizeof(sc)); 2167 if ((ac != 2) || (sc != 2)) 2168 return; 2169 2170 if (prom_getprop(mc, "reg", mc_reg, sizeof(mc_reg)) == PROM_ERROR) 2171 return; 2172 2173 if (mc_reg[0] != CPC925_MC_START || mc_reg[1] != CPC925_MC_LENGTH) 2174 return; 2175 2176 prom_printf("Fixing up bogus hostbridge on Maple...\n"); 2177 2178 mc_reg[0] = 0x0; 2179 mc_reg[1] = CPC925_MC_START; 2180 mc_reg[2] = 0x0; 2181 mc_reg[3] = CPC925_MC_LENGTH; 2182 prom_setprop(mc, name, "reg", mc_reg, sizeof(mc_reg)); 2183 } 2184 #else 2185 #define fixup_device_tree_maple() 2186 #define fixup_device_tree_maple_memory_controller() 2187 #endif 2188 2189 #ifdef CONFIG_PPC_CHRP 2190 /* 2191 * Pegasos and BriQ lacks the "ranges" property in the isa node 2192 * Pegasos needs decimal IRQ 14/15, not hexadecimal 2193 * Pegasos has the IDE configured in legacy mode, but advertised as native 2194 */ 2195 static void __init fixup_device_tree_chrp(void) 2196 { 2197 phandle ph; 2198 u32 prop[6]; 2199 u32 rloc = 0x01006000; /* IO space; PCI device = 12 */ 2200 char *name; 2201 int rc; 2202 2203 name = "/pci@80000000/isa@c"; 2204 ph = call_prom("finddevice", 1, 1, ADDR(name)); 2205 if (!PHANDLE_VALID(ph)) { 2206 name = "/pci@ff500000/isa@6"; 2207 ph = call_prom("finddevice", 1, 1, ADDR(name)); 2208 rloc = 0x01003000; /* IO space; PCI device = 6 */ 2209 } 2210 if (PHANDLE_VALID(ph)) { 2211 rc = prom_getproplen(ph, "ranges"); 2212 if (rc == 0 || rc == PROM_ERROR) { 2213 prom_printf("Fixing up missing ISA range on Pegasos...\n"); 2214 2215 prop[0] = 0x1; 2216 prop[1] = 0x0; 2217 prop[2] = rloc; 2218 prop[3] = 0x0; 2219 prop[4] = 0x0; 2220 prop[5] = 0x00010000; 2221 prom_setprop(ph, name, "ranges", prop, sizeof(prop)); 2222 } 2223 } 2224 2225 name = "/pci@80000000/ide@C,1"; 2226 ph = call_prom("finddevice", 1, 1, ADDR(name)); 2227 if (PHANDLE_VALID(ph)) { 2228 prom_printf("Fixing up IDE interrupt on Pegasos...\n"); 2229 prop[0] = 14; 2230 prop[1] = 0x0; 2231 prom_setprop(ph, name, "interrupts", prop, 2*sizeof(u32)); 2232 prom_printf("Fixing up IDE class-code on Pegasos...\n"); 2233 rc = prom_getprop(ph, "class-code", prop, sizeof(u32)); 2234 if (rc == sizeof(u32)) { 2235 prop[0] &= ~0x5; 2236 prom_setprop(ph, name, "class-code", prop, sizeof(u32)); 2237 } 2238 } 2239 } 2240 #else 2241 #define fixup_device_tree_chrp() 2242 #endif 2243 2244 #if defined(CONFIG_PPC64) && defined(CONFIG_PPC_PMAC) 2245 static void __init fixup_device_tree_pmac(void) 2246 { 2247 phandle u3, i2c, mpic; 2248 u32 u3_rev; 2249 u32 interrupts[2]; 2250 u32 parent; 2251 2252 /* Some G5s have a missing interrupt definition, fix it up here */ 2253 u3 = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000")); 2254 if (!PHANDLE_VALID(u3)) 2255 return; 2256 i2c = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/i2c@f8001000")); 2257 if (!PHANDLE_VALID(i2c)) 2258 return; 2259 mpic = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/mpic@f8040000")); 2260 if (!PHANDLE_VALID(mpic)) 2261 return; 2262 2263 /* check if proper rev of u3 */ 2264 if (prom_getprop(u3, "device-rev", &u3_rev, sizeof(u3_rev)) 2265 == PROM_ERROR) 2266 return; 2267 if (u3_rev < 0x35 || u3_rev > 0x39) 2268 return; 2269 /* does it need fixup ? */ 2270 if (prom_getproplen(i2c, "interrupts") > 0) 2271 return; 2272 2273 prom_printf("fixing up bogus interrupts for u3 i2c...\n"); 2274 2275 /* interrupt on this revision of u3 is number 0 and level */ 2276 interrupts[0] = 0; 2277 interrupts[1] = 1; 2278 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupts", 2279 &interrupts, sizeof(interrupts)); 2280 parent = (u32)mpic; 2281 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupt-parent", 2282 &parent, sizeof(parent)); 2283 } 2284 #else 2285 #define fixup_device_tree_pmac() 2286 #endif 2287 2288 #ifdef CONFIG_PPC_EFIKA 2289 /* 2290 * The MPC5200 FEC driver requires an phy-handle property to tell it how 2291 * to talk to the phy. If the phy-handle property is missing, then this 2292 * function is called to add the appropriate nodes and link it to the 2293 * ethernet node. 2294 */ 2295 static void __init fixup_device_tree_efika_add_phy(void) 2296 { 2297 u32 node; 2298 char prop[64]; 2299 int rv; 2300 2301 /* Check if /builtin/ethernet exists - bail if it doesn't */ 2302 node = call_prom("finddevice", 1, 1, ADDR("/builtin/ethernet")); 2303 if (!PHANDLE_VALID(node)) 2304 return; 2305 2306 /* Check if the phy-handle property exists - bail if it does */ 2307 rv = prom_getprop(node, "phy-handle", prop, sizeof(prop)); 2308 if (!rv) 2309 return; 2310 2311 /* 2312 * At this point the ethernet device doesn't have a phy described. 2313 * Now we need to add the missing phy node and linkage 2314 */ 2315 2316 /* Check for an MDIO bus node - if missing then create one */ 2317 node = call_prom("finddevice", 1, 1, ADDR("/builtin/mdio")); 2318 if (!PHANDLE_VALID(node)) { 2319 prom_printf("Adding Ethernet MDIO node\n"); 2320 call_prom("interpret", 1, 1, 2321 " s\" /builtin\" find-device" 2322 " new-device" 2323 " 1 encode-int s\" #address-cells\" property" 2324 " 0 encode-int s\" #size-cells\" property" 2325 " s\" mdio\" device-name" 2326 " s\" fsl,mpc5200b-mdio\" encode-string" 2327 " s\" compatible\" property" 2328 " 0xf0003000 0x400 reg" 2329 " 0x2 encode-int" 2330 " 0x5 encode-int encode+" 2331 " 0x3 encode-int encode+" 2332 " s\" interrupts\" property" 2333 " finish-device"); 2334 }; 2335 2336 /* Check for a PHY device node - if missing then create one and 2337 * give it's phandle to the ethernet node */ 2338 node = call_prom("finddevice", 1, 1, 2339 ADDR("/builtin/mdio/ethernet-phy")); 2340 if (!PHANDLE_VALID(node)) { 2341 prom_printf("Adding Ethernet PHY node\n"); 2342 call_prom("interpret", 1, 1, 2343 " s\" /builtin/mdio\" find-device" 2344 " new-device" 2345 " s\" ethernet-phy\" device-name" 2346 " 0x10 encode-int s\" reg\" property" 2347 " my-self" 2348 " ihandle>phandle" 2349 " finish-device" 2350 " s\" /builtin/ethernet\" find-device" 2351 " encode-int" 2352 " s\" phy-handle\" property" 2353 " device-end"); 2354 } 2355 } 2356 2357 static void __init fixup_device_tree_efika(void) 2358 { 2359 int sound_irq[3] = { 2, 2, 0 }; 2360 int bcomm_irq[3*16] = { 3,0,0, 3,1,0, 3,2,0, 3,3,0, 2361 3,4,0, 3,5,0, 3,6,0, 3,7,0, 2362 3,8,0, 3,9,0, 3,10,0, 3,11,0, 2363 3,12,0, 3,13,0, 3,14,0, 3,15,0 }; 2364 u32 node; 2365 char prop[64]; 2366 int rv, len; 2367 2368 /* Check if we're really running on a EFIKA */ 2369 node = call_prom("finddevice", 1, 1, ADDR("/")); 2370 if (!PHANDLE_VALID(node)) 2371 return; 2372 2373 rv = prom_getprop(node, "model", prop, sizeof(prop)); 2374 if (rv == PROM_ERROR) 2375 return; 2376 if (strcmp(prop, "EFIKA5K2")) 2377 return; 2378 2379 prom_printf("Applying EFIKA device tree fixups\n"); 2380 2381 /* Claiming to be 'chrp' is death */ 2382 node = call_prom("finddevice", 1, 1, ADDR("/")); 2383 rv = prom_getprop(node, "device_type", prop, sizeof(prop)); 2384 if (rv != PROM_ERROR && (strcmp(prop, "chrp") == 0)) 2385 prom_setprop(node, "/", "device_type", "efika", sizeof("efika")); 2386 2387 /* CODEGEN,description is exposed in /proc/cpuinfo so 2388 fix that too */ 2389 rv = prom_getprop(node, "CODEGEN,description", prop, sizeof(prop)); 2390 if (rv != PROM_ERROR && (strstr(prop, "CHRP"))) 2391 prom_setprop(node, "/", "CODEGEN,description", 2392 "Efika 5200B PowerPC System", 2393 sizeof("Efika 5200B PowerPC System")); 2394 2395 /* Fixup bestcomm interrupts property */ 2396 node = call_prom("finddevice", 1, 1, ADDR("/builtin/bestcomm")); 2397 if (PHANDLE_VALID(node)) { 2398 len = prom_getproplen(node, "interrupts"); 2399 if (len == 12) { 2400 prom_printf("Fixing bestcomm interrupts property\n"); 2401 prom_setprop(node, "/builtin/bestcom", "interrupts", 2402 bcomm_irq, sizeof(bcomm_irq)); 2403 } 2404 } 2405 2406 /* Fixup sound interrupts property */ 2407 node = call_prom("finddevice", 1, 1, ADDR("/builtin/sound")); 2408 if (PHANDLE_VALID(node)) { 2409 rv = prom_getprop(node, "interrupts", prop, sizeof(prop)); 2410 if (rv == PROM_ERROR) { 2411 prom_printf("Adding sound interrupts property\n"); 2412 prom_setprop(node, "/builtin/sound", "interrupts", 2413 sound_irq, sizeof(sound_irq)); 2414 } 2415 } 2416 2417 /* Make sure ethernet phy-handle property exists */ 2418 fixup_device_tree_efika_add_phy(); 2419 } 2420 #else 2421 #define fixup_device_tree_efika() 2422 #endif 2423 2424 static void __init fixup_device_tree(void) 2425 { 2426 fixup_device_tree_maple(); 2427 fixup_device_tree_maple_memory_controller(); 2428 fixup_device_tree_chrp(); 2429 fixup_device_tree_pmac(); 2430 fixup_device_tree_efika(); 2431 } 2432 2433 static void __init prom_find_boot_cpu(void) 2434 { 2435 struct prom_t *_prom = &RELOC(prom); 2436 u32 getprop_rval; 2437 ihandle prom_cpu; 2438 phandle cpu_pkg; 2439 2440 _prom->cpu = 0; 2441 if (prom_getprop(_prom->chosen, "cpu", &prom_cpu, sizeof(prom_cpu)) <= 0) 2442 return; 2443 2444 cpu_pkg = call_prom("instance-to-package", 1, 1, prom_cpu); 2445 2446 prom_getprop(cpu_pkg, "reg", &getprop_rval, sizeof(getprop_rval)); 2447 _prom->cpu = getprop_rval; 2448 2449 prom_debug("Booting CPU hw index = %lu\n", _prom->cpu); 2450 } 2451 2452 static void __init prom_check_initrd(unsigned long r3, unsigned long r4) 2453 { 2454 #ifdef CONFIG_BLK_DEV_INITRD 2455 struct prom_t *_prom = &RELOC(prom); 2456 2457 if (r3 && r4 && r4 != 0xdeadbeef) { 2458 unsigned long val; 2459 2460 RELOC(prom_initrd_start) = is_kernel_addr(r3) ? __pa(r3) : r3; 2461 RELOC(prom_initrd_end) = RELOC(prom_initrd_start) + r4; 2462 2463 val = RELOC(prom_initrd_start); 2464 prom_setprop(_prom->chosen, "/chosen", "linux,initrd-start", 2465 &val, sizeof(val)); 2466 val = RELOC(prom_initrd_end); 2467 prom_setprop(_prom->chosen, "/chosen", "linux,initrd-end", 2468 &val, sizeof(val)); 2469 2470 reserve_mem(RELOC(prom_initrd_start), 2471 RELOC(prom_initrd_end) - RELOC(prom_initrd_start)); 2472 2473 prom_debug("initrd_start=0x%x\n", RELOC(prom_initrd_start)); 2474 prom_debug("initrd_end=0x%x\n", RELOC(prom_initrd_end)); 2475 } 2476 #endif /* CONFIG_BLK_DEV_INITRD */ 2477 } 2478 2479 /* 2480 * We enter here early on, when the Open Firmware prom is still 2481 * handling exceptions and the MMU hash table for us. 2482 */ 2483 2484 unsigned long __init prom_init(unsigned long r3, unsigned long r4, 2485 unsigned long pp, 2486 unsigned long r6, unsigned long r7, 2487 unsigned long kbase) 2488 { 2489 struct prom_t *_prom; 2490 unsigned long hdr; 2491 2492 #ifdef CONFIG_PPC32 2493 unsigned long offset = reloc_offset(); 2494 reloc_got2(offset); 2495 #endif 2496 2497 _prom = &RELOC(prom); 2498 2499 /* 2500 * First zero the BSS 2501 */ 2502 memset(&RELOC(__bss_start), 0, __bss_stop - __bss_start); 2503 2504 /* 2505 * Init interface to Open Firmware, get some node references, 2506 * like /chosen 2507 */ 2508 prom_init_client_services(pp); 2509 2510 /* 2511 * See if this OF is old enough that we need to do explicit maps 2512 * and other workarounds 2513 */ 2514 prom_find_mmu(); 2515 2516 /* 2517 * Init prom stdout device 2518 */ 2519 prom_init_stdout(); 2520 2521 prom_printf("Preparing to boot %s", RELOC(linux_banner)); 2522 2523 /* 2524 * Get default machine type. At this point, we do not differentiate 2525 * between pSeries SMP and pSeries LPAR 2526 */ 2527 RELOC(of_platform) = prom_find_machine_type(); 2528 2529 #ifndef CONFIG_RELOCATABLE 2530 /* Bail if this is a kdump kernel. */ 2531 if (PHYSICAL_START > 0) 2532 prom_panic("Error: You can't boot a kdump kernel from OF!\n"); 2533 #endif 2534 2535 /* 2536 * Check for an initrd 2537 */ 2538 prom_check_initrd(r3, r4); 2539 2540 #ifdef CONFIG_PPC_PSERIES 2541 /* 2542 * On pSeries, inform the firmware about our capabilities 2543 */ 2544 if (RELOC(of_platform) == PLATFORM_PSERIES || 2545 RELOC(of_platform) == PLATFORM_PSERIES_LPAR) 2546 prom_send_capabilities(); 2547 #endif 2548 2549 /* 2550 * Copy the CPU hold code 2551 */ 2552 if (RELOC(of_platform) != PLATFORM_POWERMAC) 2553 copy_and_flush(0, kbase, 0x100, 0); 2554 2555 /* 2556 * Do early parsing of command line 2557 */ 2558 early_cmdline_parse(); 2559 2560 /* 2561 * Initialize memory management within prom_init 2562 */ 2563 prom_init_mem(); 2564 2565 /* 2566 * Determine which cpu is actually running right _now_ 2567 */ 2568 prom_find_boot_cpu(); 2569 2570 /* 2571 * Initialize display devices 2572 */ 2573 prom_check_displays(); 2574 2575 #ifdef CONFIG_PPC64 2576 /* 2577 * Initialize IOMMU (TCE tables) on pSeries. Do that before anything else 2578 * that uses the allocator, we need to make sure we get the top of memory 2579 * available for us here... 2580 */ 2581 if (RELOC(of_platform) == PLATFORM_PSERIES) 2582 prom_initialize_tce_table(); 2583 #endif 2584 2585 /* 2586 * On non-powermacs, try to instantiate RTAS and puts all CPUs 2587 * in spin-loops. PowerMacs don't have a working RTAS and use 2588 * a different way to spin CPUs 2589 */ 2590 if (RELOC(of_platform) != PLATFORM_POWERMAC) { 2591 prom_instantiate_rtas(); 2592 prom_hold_cpus(); 2593 } 2594 2595 /* 2596 * Fill in some infos for use by the kernel later on 2597 */ 2598 if (RELOC(prom_memory_limit)) 2599 prom_setprop(_prom->chosen, "/chosen", "linux,memory-limit", 2600 &RELOC(prom_memory_limit), 2601 sizeof(prom_memory_limit)); 2602 #ifdef CONFIG_PPC64 2603 if (RELOC(prom_iommu_off)) 2604 prom_setprop(_prom->chosen, "/chosen", "linux,iommu-off", 2605 NULL, 0); 2606 2607 if (RELOC(prom_iommu_force_on)) 2608 prom_setprop(_prom->chosen, "/chosen", "linux,iommu-force-on", 2609 NULL, 0); 2610 2611 if (RELOC(prom_tce_alloc_start)) { 2612 prom_setprop(_prom->chosen, "/chosen", "linux,tce-alloc-start", 2613 &RELOC(prom_tce_alloc_start), 2614 sizeof(prom_tce_alloc_start)); 2615 prom_setprop(_prom->chosen, "/chosen", "linux,tce-alloc-end", 2616 &RELOC(prom_tce_alloc_end), 2617 sizeof(prom_tce_alloc_end)); 2618 } 2619 #endif 2620 2621 /* 2622 * Fixup any known bugs in the device-tree 2623 */ 2624 fixup_device_tree(); 2625 2626 /* 2627 * Now finally create the flattened device-tree 2628 */ 2629 prom_printf("copying OF device tree...\n"); 2630 flatten_device_tree(); 2631 2632 /* 2633 * in case stdin is USB and still active on IBM machines... 2634 * Unfortunately quiesce crashes on some powermacs if we have 2635 * closed stdin already (in particular the powerbook 101). 2636 */ 2637 if (RELOC(of_platform) != PLATFORM_POWERMAC) 2638 prom_close_stdin(); 2639 2640 /* 2641 * Call OF "quiesce" method to shut down pending DMA's from 2642 * devices etc... 2643 */ 2644 prom_printf("Calling quiesce...\n"); 2645 call_prom("quiesce", 0, 0); 2646 2647 /* 2648 * And finally, call the kernel passing it the flattened device 2649 * tree and NULL as r5, thus triggering the new entry point which 2650 * is common to us and kexec 2651 */ 2652 hdr = RELOC(dt_header_start); 2653 prom_printf("returning from prom_init\n"); 2654 prom_debug("->dt_header_start=0x%x\n", hdr); 2655 2656 #ifdef CONFIG_PPC32 2657 reloc_got2(-offset); 2658 #endif 2659 2660 __start(hdr, kbase, 0); 2661 2662 return 0; 2663 } 2664