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