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