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..."); 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 } 818 819 /* no ibm,client-architecture-support call, try the old way */ 820 elfloader = call_prom("open", 1, 1, ADDR("/packages/elf-loader")); 821 if (elfloader == 0) { 822 prom_printf("couldn't open /packages/elf-loader\n"); 823 return; 824 } 825 call_prom("call-method", 3, 1, ADDR("process-elf-header"), 826 elfloader, ADDR(&fake_elf)); 827 call_prom("close", 1, 0, elfloader); 828 } 829 #endif 830 831 /* 832 * Memory allocation strategy... our layout is normally: 833 * 834 * at 14Mb or more we have vmlinux, then a gap and initrd. In some 835 * rare cases, initrd might end up being before the kernel though. 836 * We assume this won't override the final kernel at 0, we have no 837 * provision to handle that in this version, but it should hopefully 838 * never happen. 839 * 840 * alloc_top is set to the top of RMO, eventually shrink down if the 841 * TCEs overlap 842 * 843 * alloc_bottom is set to the top of kernel/initrd 844 * 845 * from there, allocations are done this way : rtas is allocated 846 * topmost, and the device-tree is allocated from the bottom. We try 847 * to grow the device-tree allocation as we progress. If we can't, 848 * then we fail, we don't currently have a facility to restart 849 * elsewhere, but that shouldn't be necessary. 850 * 851 * Note that calls to reserve_mem have to be done explicitly, memory 852 * allocated with either alloc_up or alloc_down isn't automatically 853 * reserved. 854 */ 855 856 857 /* 858 * Allocates memory in the RMO upward from the kernel/initrd 859 * 860 * When align is 0, this is a special case, it means to allocate in place 861 * at the current location of alloc_bottom or fail (that is basically 862 * extending the previous allocation). Used for the device-tree flattening 863 */ 864 static unsigned long __init alloc_up(unsigned long size, unsigned long align) 865 { 866 unsigned long base = RELOC(alloc_bottom); 867 unsigned long addr = 0; 868 869 if (align) 870 base = _ALIGN_UP(base, align); 871 prom_debug("alloc_up(%x, %x)\n", size, align); 872 if (RELOC(ram_top) == 0) 873 prom_panic("alloc_up() called with mem not initialized\n"); 874 875 if (align) 876 base = _ALIGN_UP(RELOC(alloc_bottom), align); 877 else 878 base = RELOC(alloc_bottom); 879 880 for(; (base + size) <= RELOC(alloc_top); 881 base = _ALIGN_UP(base + 0x100000, align)) { 882 prom_debug(" trying: 0x%x\n\r", base); 883 addr = (unsigned long)prom_claim(base, size, 0); 884 if (addr != PROM_ERROR && addr != 0) 885 break; 886 addr = 0; 887 if (align == 0) 888 break; 889 } 890 if (addr == 0) 891 return 0; 892 RELOC(alloc_bottom) = addr; 893 894 prom_debug(" -> %x\n", addr); 895 prom_debug(" alloc_bottom : %x\n", RELOC(alloc_bottom)); 896 prom_debug(" alloc_top : %x\n", RELOC(alloc_top)); 897 prom_debug(" alloc_top_hi : %x\n", RELOC(alloc_top_high)); 898 prom_debug(" rmo_top : %x\n", RELOC(rmo_top)); 899 prom_debug(" ram_top : %x\n", RELOC(ram_top)); 900 901 return addr; 902 } 903 904 /* 905 * Allocates memory downward, either from top of RMO, or if highmem 906 * is set, from the top of RAM. Note that this one doesn't handle 907 * failures. It does claim memory if highmem is not set. 908 */ 909 static unsigned long __init alloc_down(unsigned long size, unsigned long align, 910 int highmem) 911 { 912 unsigned long base, addr = 0; 913 914 prom_debug("alloc_down(%x, %x, %s)\n", size, align, 915 highmem ? RELOC("(high)") : RELOC("(low)")); 916 if (RELOC(ram_top) == 0) 917 prom_panic("alloc_down() called with mem not initialized\n"); 918 919 if (highmem) { 920 /* Carve out storage for the TCE table. */ 921 addr = _ALIGN_DOWN(RELOC(alloc_top_high) - size, align); 922 if (addr <= RELOC(alloc_bottom)) 923 return 0; 924 /* Will we bump into the RMO ? If yes, check out that we 925 * didn't overlap existing allocations there, if we did, 926 * we are dead, we must be the first in town ! 927 */ 928 if (addr < RELOC(rmo_top)) { 929 /* Good, we are first */ 930 if (RELOC(alloc_top) == RELOC(rmo_top)) 931 RELOC(alloc_top) = RELOC(rmo_top) = addr; 932 else 933 return 0; 934 } 935 RELOC(alloc_top_high) = addr; 936 goto bail; 937 } 938 939 base = _ALIGN_DOWN(RELOC(alloc_top) - size, align); 940 for (; base > RELOC(alloc_bottom); 941 base = _ALIGN_DOWN(base - 0x100000, align)) { 942 prom_debug(" trying: 0x%x\n\r", base); 943 addr = (unsigned long)prom_claim(base, size, 0); 944 if (addr != PROM_ERROR && addr != 0) 945 break; 946 addr = 0; 947 } 948 if (addr == 0) 949 return 0; 950 RELOC(alloc_top) = addr; 951 952 bail: 953 prom_debug(" -> %x\n", addr); 954 prom_debug(" alloc_bottom : %x\n", RELOC(alloc_bottom)); 955 prom_debug(" alloc_top : %x\n", RELOC(alloc_top)); 956 prom_debug(" alloc_top_hi : %x\n", RELOC(alloc_top_high)); 957 prom_debug(" rmo_top : %x\n", RELOC(rmo_top)); 958 prom_debug(" ram_top : %x\n", RELOC(ram_top)); 959 960 return addr; 961 } 962 963 /* 964 * Parse a "reg" cell 965 */ 966 static unsigned long __init prom_next_cell(int s, cell_t **cellp) 967 { 968 cell_t *p = *cellp; 969 unsigned long r = 0; 970 971 /* Ignore more than 2 cells */ 972 while (s > sizeof(unsigned long) / 4) { 973 p++; 974 s--; 975 } 976 r = *p++; 977 #ifdef CONFIG_PPC64 978 if (s > 1) { 979 r <<= 32; 980 r |= *(p++); 981 } 982 #endif 983 *cellp = p; 984 return r; 985 } 986 987 /* 988 * Very dumb function for adding to the memory reserve list, but 989 * we don't need anything smarter at this point 990 * 991 * XXX Eventually check for collisions. They should NEVER happen. 992 * If problems seem to show up, it would be a good start to track 993 * them down. 994 */ 995 static void __init reserve_mem(u64 base, u64 size) 996 { 997 u64 top = base + size; 998 unsigned long cnt = RELOC(mem_reserve_cnt); 999 1000 if (size == 0) 1001 return; 1002 1003 /* We need to always keep one empty entry so that we 1004 * have our terminator with "size" set to 0 since we are 1005 * dumb and just copy this entire array to the boot params 1006 */ 1007 base = _ALIGN_DOWN(base, PAGE_SIZE); 1008 top = _ALIGN_UP(top, PAGE_SIZE); 1009 size = top - base; 1010 1011 if (cnt >= (MEM_RESERVE_MAP_SIZE - 1)) 1012 prom_panic("Memory reserve map exhausted !\n"); 1013 RELOC(mem_reserve_map)[cnt].base = base; 1014 RELOC(mem_reserve_map)[cnt].size = size; 1015 RELOC(mem_reserve_cnt) = cnt + 1; 1016 } 1017 1018 /* 1019 * Initialize memory allocation mechanism, parse "memory" nodes and 1020 * obtain that way the top of memory and RMO to setup out local allocator 1021 */ 1022 static void __init prom_init_mem(void) 1023 { 1024 phandle node; 1025 char *path, type[64]; 1026 unsigned int plen; 1027 cell_t *p, *endp; 1028 struct prom_t *_prom = &RELOC(prom); 1029 u32 rac, rsc; 1030 1031 /* 1032 * We iterate the memory nodes to find 1033 * 1) top of RMO (first node) 1034 * 2) top of memory 1035 */ 1036 rac = 2; 1037 prom_getprop(_prom->root, "#address-cells", &rac, sizeof(rac)); 1038 rsc = 1; 1039 prom_getprop(_prom->root, "#size-cells", &rsc, sizeof(rsc)); 1040 prom_debug("root_addr_cells: %x\n", (unsigned long) rac); 1041 prom_debug("root_size_cells: %x\n", (unsigned long) rsc); 1042 1043 prom_debug("scanning memory:\n"); 1044 path = RELOC(prom_scratch); 1045 1046 for (node = 0; prom_next_node(&node); ) { 1047 type[0] = 0; 1048 prom_getprop(node, "device_type", type, sizeof(type)); 1049 1050 if (type[0] == 0) { 1051 /* 1052 * CHRP Longtrail machines have no device_type 1053 * on the memory node, so check the name instead... 1054 */ 1055 prom_getprop(node, "name", type, sizeof(type)); 1056 } 1057 if (strcmp(type, RELOC("memory"))) 1058 continue; 1059 1060 plen = prom_getprop(node, "reg", RELOC(regbuf), sizeof(regbuf)); 1061 if (plen > sizeof(regbuf)) { 1062 prom_printf("memory node too large for buffer !\n"); 1063 plen = sizeof(regbuf); 1064 } 1065 p = RELOC(regbuf); 1066 endp = p + (plen / sizeof(cell_t)); 1067 1068 #ifdef DEBUG_PROM 1069 memset(path, 0, PROM_SCRATCH_SIZE); 1070 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1); 1071 prom_debug(" node %s :\n", path); 1072 #endif /* DEBUG_PROM */ 1073 1074 while ((endp - p) >= (rac + rsc)) { 1075 unsigned long base, size; 1076 1077 base = prom_next_cell(rac, &p); 1078 size = prom_next_cell(rsc, &p); 1079 1080 if (size == 0) 1081 continue; 1082 prom_debug(" %x %x\n", base, size); 1083 if (base == 0 && (RELOC(of_platform) & PLATFORM_LPAR)) 1084 RELOC(rmo_top) = size; 1085 if ((base + size) > RELOC(ram_top)) 1086 RELOC(ram_top) = base + size; 1087 } 1088 } 1089 1090 RELOC(alloc_bottom) = PAGE_ALIGN((unsigned long)&RELOC(_end) + 0x4000); 1091 1092 /* Check if we have an initrd after the kernel, if we do move our bottom 1093 * point to after it 1094 */ 1095 if (RELOC(prom_initrd_start)) { 1096 if (RELOC(prom_initrd_end) > RELOC(alloc_bottom)) 1097 RELOC(alloc_bottom) = PAGE_ALIGN(RELOC(prom_initrd_end)); 1098 } 1099 1100 /* 1101 * If prom_memory_limit is set we reduce the upper limits *except* for 1102 * alloc_top_high. This must be the real top of RAM so we can put 1103 * TCE's up there. 1104 */ 1105 1106 RELOC(alloc_top_high) = RELOC(ram_top); 1107 1108 if (RELOC(prom_memory_limit)) { 1109 if (RELOC(prom_memory_limit) <= RELOC(alloc_bottom)) { 1110 prom_printf("Ignoring mem=%x <= alloc_bottom.\n", 1111 RELOC(prom_memory_limit)); 1112 RELOC(prom_memory_limit) = 0; 1113 } else if (RELOC(prom_memory_limit) >= RELOC(ram_top)) { 1114 prom_printf("Ignoring mem=%x >= ram_top.\n", 1115 RELOC(prom_memory_limit)); 1116 RELOC(prom_memory_limit) = 0; 1117 } else { 1118 RELOC(ram_top) = RELOC(prom_memory_limit); 1119 RELOC(rmo_top) = min(RELOC(rmo_top), RELOC(prom_memory_limit)); 1120 } 1121 } 1122 1123 /* 1124 * Setup our top alloc point, that is top of RMO or top of 1125 * segment 0 when running non-LPAR. 1126 * Some RS64 machines have buggy firmware where claims up at 1127 * 1GB fail. Cap at 768MB as a workaround. 1128 * Since 768MB is plenty of room, and we need to cap to something 1129 * reasonable on 32-bit, cap at 768MB on all machines. 1130 */ 1131 if (!RELOC(rmo_top)) 1132 RELOC(rmo_top) = RELOC(ram_top); 1133 RELOC(rmo_top) = min(0x30000000ul, RELOC(rmo_top)); 1134 RELOC(alloc_top) = RELOC(rmo_top); 1135 RELOC(alloc_top_high) = RELOC(ram_top); 1136 1137 prom_printf("memory layout at init:\n"); 1138 prom_printf(" memory_limit : %x (16 MB aligned)\n", RELOC(prom_memory_limit)); 1139 prom_printf(" alloc_bottom : %x\n", RELOC(alloc_bottom)); 1140 prom_printf(" alloc_top : %x\n", RELOC(alloc_top)); 1141 prom_printf(" alloc_top_hi : %x\n", RELOC(alloc_top_high)); 1142 prom_printf(" rmo_top : %x\n", RELOC(rmo_top)); 1143 prom_printf(" ram_top : %x\n", RELOC(ram_top)); 1144 } 1145 1146 1147 /* 1148 * Allocate room for and instantiate RTAS 1149 */ 1150 static void __init prom_instantiate_rtas(void) 1151 { 1152 phandle rtas_node; 1153 ihandle rtas_inst; 1154 u32 base, entry = 0; 1155 u32 size = 0; 1156 1157 prom_debug("prom_instantiate_rtas: start...\n"); 1158 1159 rtas_node = call_prom("finddevice", 1, 1, ADDR("/rtas")); 1160 prom_debug("rtas_node: %x\n", rtas_node); 1161 if (!PHANDLE_VALID(rtas_node)) 1162 return; 1163 1164 prom_getprop(rtas_node, "rtas-size", &size, sizeof(size)); 1165 if (size == 0) 1166 return; 1167 1168 base = alloc_down(size, PAGE_SIZE, 0); 1169 if (base == 0) { 1170 prom_printf("RTAS allocation failed !\n"); 1171 return; 1172 } 1173 1174 rtas_inst = call_prom("open", 1, 1, ADDR("/rtas")); 1175 if (!IHANDLE_VALID(rtas_inst)) { 1176 prom_printf("opening rtas package failed (%x)\n", rtas_inst); 1177 return; 1178 } 1179 1180 prom_printf("instantiating rtas at 0x%x...", base); 1181 1182 if (call_prom_ret("call-method", 3, 2, &entry, 1183 ADDR("instantiate-rtas"), 1184 rtas_inst, base) != 0 1185 || entry == 0) { 1186 prom_printf(" failed\n"); 1187 return; 1188 } 1189 prom_printf(" done\n"); 1190 1191 reserve_mem(base, size); 1192 1193 prom_setprop(rtas_node, "/rtas", "linux,rtas-base", 1194 &base, sizeof(base)); 1195 prom_setprop(rtas_node, "/rtas", "linux,rtas-entry", 1196 &entry, sizeof(entry)); 1197 1198 prom_debug("rtas base = 0x%x\n", base); 1199 prom_debug("rtas entry = 0x%x\n", entry); 1200 prom_debug("rtas size = 0x%x\n", (long)size); 1201 1202 prom_debug("prom_instantiate_rtas: end...\n"); 1203 } 1204 1205 #ifdef CONFIG_PPC64 1206 /* 1207 * Allocate room for and initialize TCE tables 1208 */ 1209 static void __init prom_initialize_tce_table(void) 1210 { 1211 phandle node; 1212 ihandle phb_node; 1213 char compatible[64], type[64], model[64]; 1214 char *path = RELOC(prom_scratch); 1215 u64 base, align; 1216 u32 minalign, minsize; 1217 u64 tce_entry, *tce_entryp; 1218 u64 local_alloc_top, local_alloc_bottom; 1219 u64 i; 1220 1221 if (RELOC(prom_iommu_off)) 1222 return; 1223 1224 prom_debug("starting prom_initialize_tce_table\n"); 1225 1226 /* Cache current top of allocs so we reserve a single block */ 1227 local_alloc_top = RELOC(alloc_top_high); 1228 local_alloc_bottom = local_alloc_top; 1229 1230 /* Search all nodes looking for PHBs. */ 1231 for (node = 0; prom_next_node(&node); ) { 1232 compatible[0] = 0; 1233 type[0] = 0; 1234 model[0] = 0; 1235 prom_getprop(node, "compatible", 1236 compatible, sizeof(compatible)); 1237 prom_getprop(node, "device_type", type, sizeof(type)); 1238 prom_getprop(node, "model", model, sizeof(model)); 1239 1240 if ((type[0] == 0) || (strstr(type, RELOC("pci")) == NULL)) 1241 continue; 1242 1243 /* Keep the old logic intact to avoid regression. */ 1244 if (compatible[0] != 0) { 1245 if ((strstr(compatible, RELOC("python")) == NULL) && 1246 (strstr(compatible, RELOC("Speedwagon")) == NULL) && 1247 (strstr(compatible, RELOC("Winnipeg")) == NULL)) 1248 continue; 1249 } else if (model[0] != 0) { 1250 if ((strstr(model, RELOC("ython")) == NULL) && 1251 (strstr(model, RELOC("peedwagon")) == NULL) && 1252 (strstr(model, RELOC("innipeg")) == NULL)) 1253 continue; 1254 } 1255 1256 if (prom_getprop(node, "tce-table-minalign", &minalign, 1257 sizeof(minalign)) == PROM_ERROR) 1258 minalign = 0; 1259 if (prom_getprop(node, "tce-table-minsize", &minsize, 1260 sizeof(minsize)) == PROM_ERROR) 1261 minsize = 4UL << 20; 1262 1263 /* 1264 * Even though we read what OF wants, we just set the table 1265 * size to 4 MB. This is enough to map 2GB of PCI DMA space. 1266 * By doing this, we avoid the pitfalls of trying to DMA to 1267 * MMIO space and the DMA alias hole. 1268 * 1269 * On POWER4, firmware sets the TCE region by assuming 1270 * each TCE table is 8MB. Using this memory for anything 1271 * else will impact performance, so we always allocate 8MB. 1272 * Anton 1273 */ 1274 if (__is_processor(PV_POWER4) || __is_processor(PV_POWER4p)) 1275 minsize = 8UL << 20; 1276 else 1277 minsize = 4UL << 20; 1278 1279 /* Align to the greater of the align or size */ 1280 align = max(minalign, minsize); 1281 base = alloc_down(minsize, align, 1); 1282 if (base == 0) 1283 prom_panic("ERROR, cannot find space for TCE table.\n"); 1284 if (base < local_alloc_bottom) 1285 local_alloc_bottom = base; 1286 1287 /* It seems OF doesn't null-terminate the path :-( */ 1288 memset(path, 0, PROM_SCRATCH_SIZE); 1289 /* Call OF to setup the TCE hardware */ 1290 if (call_prom("package-to-path", 3, 1, node, 1291 path, PROM_SCRATCH_SIZE-1) == PROM_ERROR) { 1292 prom_printf("package-to-path failed\n"); 1293 } 1294 1295 /* Save away the TCE table attributes for later use. */ 1296 prom_setprop(node, path, "linux,tce-base", &base, sizeof(base)); 1297 prom_setprop(node, path, "linux,tce-size", &minsize, sizeof(minsize)); 1298 1299 prom_debug("TCE table: %s\n", path); 1300 prom_debug("\tnode = 0x%x\n", node); 1301 prom_debug("\tbase = 0x%x\n", base); 1302 prom_debug("\tsize = 0x%x\n", minsize); 1303 1304 /* Initialize the table to have a one-to-one mapping 1305 * over the allocated size. 1306 */ 1307 tce_entryp = (u64 *)base; 1308 for (i = 0; i < (minsize >> 3) ;tce_entryp++, i++) { 1309 tce_entry = (i << PAGE_SHIFT); 1310 tce_entry |= 0x3; 1311 *tce_entryp = tce_entry; 1312 } 1313 1314 prom_printf("opening PHB %s", path); 1315 phb_node = call_prom("open", 1, 1, path); 1316 if (phb_node == 0) 1317 prom_printf("... failed\n"); 1318 else 1319 prom_printf("... done\n"); 1320 1321 call_prom("call-method", 6, 0, ADDR("set-64-bit-addressing"), 1322 phb_node, -1, minsize, 1323 (u32) base, (u32) (base >> 32)); 1324 call_prom("close", 1, 0, phb_node); 1325 } 1326 1327 reserve_mem(local_alloc_bottom, local_alloc_top - local_alloc_bottom); 1328 1329 /* These are only really needed if there is a memory limit in 1330 * effect, but we don't know so export them always. */ 1331 RELOC(prom_tce_alloc_start) = local_alloc_bottom; 1332 RELOC(prom_tce_alloc_end) = local_alloc_top; 1333 1334 /* Flag the first invalid entry */ 1335 prom_debug("ending prom_initialize_tce_table\n"); 1336 } 1337 #endif 1338 1339 /* 1340 * With CHRP SMP we need to use the OF to start the other processors. 1341 * We can't wait until smp_boot_cpus (the OF is trashed by then) 1342 * so we have to put the processors into a holding pattern controlled 1343 * by the kernel (not OF) before we destroy the OF. 1344 * 1345 * This uses a chunk of low memory, puts some holding pattern 1346 * code there and sends the other processors off to there until 1347 * smp_boot_cpus tells them to do something. The holding pattern 1348 * checks that address until its cpu # is there, when it is that 1349 * cpu jumps to __secondary_start(). smp_boot_cpus() takes care 1350 * of setting those values. 1351 * 1352 * We also use physical address 0x4 here to tell when a cpu 1353 * is in its holding pattern code. 1354 * 1355 * -- Cort 1356 */ 1357 /* 1358 * We want to reference the copy of __secondary_hold_* in the 1359 * 0 - 0x100 address range 1360 */ 1361 #define LOW_ADDR(x) (((unsigned long) &(x)) & 0xff) 1362 1363 static void __init prom_hold_cpus(void) 1364 { 1365 unsigned long i; 1366 unsigned int reg; 1367 phandle node; 1368 char type[64]; 1369 struct prom_t *_prom = &RELOC(prom); 1370 unsigned long *spinloop 1371 = (void *) LOW_ADDR(__secondary_hold_spinloop); 1372 unsigned long *acknowledge 1373 = (void *) LOW_ADDR(__secondary_hold_acknowledge); 1374 unsigned long secondary_hold = LOW_ADDR(__secondary_hold); 1375 1376 prom_debug("prom_hold_cpus: start...\n"); 1377 prom_debug(" 1) spinloop = 0x%x\n", (unsigned long)spinloop); 1378 prom_debug(" 1) *spinloop = 0x%x\n", *spinloop); 1379 prom_debug(" 1) acknowledge = 0x%x\n", 1380 (unsigned long)acknowledge); 1381 prom_debug(" 1) *acknowledge = 0x%x\n", *acknowledge); 1382 prom_debug(" 1) secondary_hold = 0x%x\n", secondary_hold); 1383 1384 /* Set the common spinloop variable, so all of the secondary cpus 1385 * will block when they are awakened from their OF spinloop. 1386 * This must occur for both SMP and non SMP kernels, since OF will 1387 * be trashed when we move the kernel. 1388 */ 1389 *spinloop = 0; 1390 1391 /* look for cpus */ 1392 for (node = 0; prom_next_node(&node); ) { 1393 type[0] = 0; 1394 prom_getprop(node, "device_type", type, sizeof(type)); 1395 if (strcmp(type, RELOC("cpu")) != 0) 1396 continue; 1397 1398 /* Skip non-configured cpus. */ 1399 if (prom_getprop(node, "status", type, sizeof(type)) > 0) 1400 if (strcmp(type, RELOC("okay")) != 0) 1401 continue; 1402 1403 reg = -1; 1404 prom_getprop(node, "reg", ®, sizeof(reg)); 1405 1406 prom_debug("cpu hw idx = 0x%x\n", reg); 1407 1408 /* Init the acknowledge var which will be reset by 1409 * the secondary cpu when it awakens from its OF 1410 * spinloop. 1411 */ 1412 *acknowledge = (unsigned long)-1; 1413 1414 if (reg != _prom->cpu) { 1415 /* Primary Thread of non-boot cpu */ 1416 prom_printf("starting cpu hw idx %x... ", reg); 1417 call_prom("start-cpu", 3, 0, node, 1418 secondary_hold, reg); 1419 1420 for (i = 0; (i < 100000000) && 1421 (*acknowledge == ((unsigned long)-1)); i++ ) 1422 mb(); 1423 1424 if (*acknowledge == reg) 1425 prom_printf("done\n"); 1426 else 1427 prom_printf("failed: %x\n", *acknowledge); 1428 } 1429 #ifdef CONFIG_SMP 1430 else 1431 prom_printf("boot cpu hw idx %x\n", reg); 1432 #endif /* CONFIG_SMP */ 1433 } 1434 1435 prom_debug("prom_hold_cpus: end...\n"); 1436 } 1437 1438 1439 static void __init prom_init_client_services(unsigned long pp) 1440 { 1441 struct prom_t *_prom = &RELOC(prom); 1442 1443 /* Get a handle to the prom entry point before anything else */ 1444 RELOC(prom_entry) = pp; 1445 1446 /* get a handle for the stdout device */ 1447 _prom->chosen = call_prom("finddevice", 1, 1, ADDR("/chosen")); 1448 if (!PHANDLE_VALID(_prom->chosen)) 1449 prom_panic("cannot find chosen"); /* msg won't be printed :( */ 1450 1451 /* get device tree root */ 1452 _prom->root = call_prom("finddevice", 1, 1, ADDR("/")); 1453 if (!PHANDLE_VALID(_prom->root)) 1454 prom_panic("cannot find device tree root"); /* msg won't be printed :( */ 1455 1456 _prom->mmumap = 0; 1457 } 1458 1459 #ifdef CONFIG_PPC32 1460 /* 1461 * For really old powermacs, we need to map things we claim. 1462 * For that, we need the ihandle of the mmu. 1463 * Also, on the longtrail, we need to work around other bugs. 1464 */ 1465 static void __init prom_find_mmu(void) 1466 { 1467 struct prom_t *_prom = &RELOC(prom); 1468 phandle oprom; 1469 char version[64]; 1470 1471 oprom = call_prom("finddevice", 1, 1, ADDR("/openprom")); 1472 if (!PHANDLE_VALID(oprom)) 1473 return; 1474 if (prom_getprop(oprom, "model", version, sizeof(version)) <= 0) 1475 return; 1476 version[sizeof(version) - 1] = 0; 1477 /* XXX might need to add other versions here */ 1478 if (strcmp(version, "Open Firmware, 1.0.5") == 0) 1479 of_workarounds = OF_WA_CLAIM; 1480 else if (strncmp(version, "FirmWorks,3.", 12) == 0) { 1481 of_workarounds = OF_WA_CLAIM | OF_WA_LONGTRAIL; 1482 call_prom("interpret", 1, 1, "dev /memory 0 to allow-reclaim"); 1483 } else 1484 return; 1485 _prom->memory = call_prom("open", 1, 1, ADDR("/memory")); 1486 prom_getprop(_prom->chosen, "mmu", &_prom->mmumap, 1487 sizeof(_prom->mmumap)); 1488 if (!IHANDLE_VALID(_prom->memory) || !IHANDLE_VALID(_prom->mmumap)) 1489 of_workarounds &= ~OF_WA_CLAIM; /* hmmm */ 1490 } 1491 #else 1492 #define prom_find_mmu() 1493 #endif 1494 1495 static void __init prom_init_stdout(void) 1496 { 1497 struct prom_t *_prom = &RELOC(prom); 1498 char *path = RELOC(of_stdout_device); 1499 char type[16]; 1500 u32 val; 1501 1502 if (prom_getprop(_prom->chosen, "stdout", &val, sizeof(val)) <= 0) 1503 prom_panic("cannot find stdout"); 1504 1505 _prom->stdout = val; 1506 1507 /* Get the full OF pathname of the stdout device */ 1508 memset(path, 0, 256); 1509 call_prom("instance-to-path", 3, 1, _prom->stdout, path, 255); 1510 val = call_prom("instance-to-package", 1, 1, _prom->stdout); 1511 prom_setprop(_prom->chosen, "/chosen", "linux,stdout-package", 1512 &val, sizeof(val)); 1513 prom_printf("OF stdout device is: %s\n", RELOC(of_stdout_device)); 1514 prom_setprop(_prom->chosen, "/chosen", "linux,stdout-path", 1515 path, strlen(path) + 1); 1516 1517 /* If it's a display, note it */ 1518 memset(type, 0, sizeof(type)); 1519 prom_getprop(val, "device_type", type, sizeof(type)); 1520 if (strcmp(type, RELOC("display")) == 0) 1521 prom_setprop(val, path, "linux,boot-display", NULL, 0); 1522 } 1523 1524 static void __init prom_close_stdin(void) 1525 { 1526 struct prom_t *_prom = &RELOC(prom); 1527 ihandle val; 1528 1529 if (prom_getprop(_prom->chosen, "stdin", &val, sizeof(val)) > 0) 1530 call_prom("close", 1, 0, val); 1531 } 1532 1533 static int __init prom_find_machine_type(void) 1534 { 1535 struct prom_t *_prom = &RELOC(prom); 1536 char compat[256]; 1537 int len, i = 0; 1538 #ifdef CONFIG_PPC64 1539 phandle rtas; 1540 int x; 1541 #endif 1542 1543 /* Look for a PowerMac */ 1544 len = prom_getprop(_prom->root, "compatible", 1545 compat, sizeof(compat)-1); 1546 if (len > 0) { 1547 compat[len] = 0; 1548 while (i < len) { 1549 char *p = &compat[i]; 1550 int sl = strlen(p); 1551 if (sl == 0) 1552 break; 1553 if (strstr(p, RELOC("Power Macintosh")) || 1554 strstr(p, RELOC("MacRISC"))) 1555 return PLATFORM_POWERMAC; 1556 #ifdef CONFIG_PPC64 1557 /* We must make sure we don't detect the IBM Cell 1558 * blades as pSeries due to some firmware issues, 1559 * so we do it here. 1560 */ 1561 if (strstr(p, RELOC("IBM,CBEA")) || 1562 strstr(p, RELOC("IBM,CPBW-1.0"))) 1563 return PLATFORM_GENERIC; 1564 #endif /* CONFIG_PPC64 */ 1565 i += sl + 1; 1566 } 1567 } 1568 #ifdef CONFIG_PPC64 1569 /* If not a mac, try to figure out if it's an IBM pSeries or any other 1570 * PAPR compliant platform. We assume it is if : 1571 * - /device_type is "chrp" (please, do NOT use that for future 1572 * non-IBM designs ! 1573 * - it has /rtas 1574 */ 1575 len = prom_getprop(_prom->root, "device_type", 1576 compat, sizeof(compat)-1); 1577 if (len <= 0) 1578 return PLATFORM_GENERIC; 1579 if (strcmp(compat, RELOC("chrp"))) 1580 return PLATFORM_GENERIC; 1581 1582 /* Default to pSeries. We need to know if we are running LPAR */ 1583 rtas = call_prom("finddevice", 1, 1, ADDR("/rtas")); 1584 if (!PHANDLE_VALID(rtas)) 1585 return PLATFORM_GENERIC; 1586 x = prom_getproplen(rtas, "ibm,hypertas-functions"); 1587 if (x != PROM_ERROR) { 1588 prom_debug("Hypertas detected, assuming LPAR !\n"); 1589 return PLATFORM_PSERIES_LPAR; 1590 } 1591 return PLATFORM_PSERIES; 1592 #else 1593 return PLATFORM_GENERIC; 1594 #endif 1595 } 1596 1597 static int __init prom_set_color(ihandle ih, int i, int r, int g, int b) 1598 { 1599 return call_prom("call-method", 6, 1, ADDR("color!"), ih, i, b, g, r); 1600 } 1601 1602 /* 1603 * If we have a display that we don't know how to drive, 1604 * we will want to try to execute OF's open method for it 1605 * later. However, OF will probably fall over if we do that 1606 * we've taken over the MMU. 1607 * So we check whether we will need to open the display, 1608 * and if so, open it now. 1609 */ 1610 static void __init prom_check_displays(void) 1611 { 1612 char type[16], *path; 1613 phandle node; 1614 ihandle ih; 1615 int i; 1616 1617 static unsigned char default_colors[] = { 1618 0x00, 0x00, 0x00, 1619 0x00, 0x00, 0xaa, 1620 0x00, 0xaa, 0x00, 1621 0x00, 0xaa, 0xaa, 1622 0xaa, 0x00, 0x00, 1623 0xaa, 0x00, 0xaa, 1624 0xaa, 0xaa, 0x00, 1625 0xaa, 0xaa, 0xaa, 1626 0x55, 0x55, 0x55, 1627 0x55, 0x55, 0xff, 1628 0x55, 0xff, 0x55, 1629 0x55, 0xff, 0xff, 1630 0xff, 0x55, 0x55, 1631 0xff, 0x55, 0xff, 1632 0xff, 0xff, 0x55, 1633 0xff, 0xff, 0xff 1634 }; 1635 const unsigned char *clut; 1636 1637 prom_debug("Looking for displays\n"); 1638 for (node = 0; prom_next_node(&node); ) { 1639 memset(type, 0, sizeof(type)); 1640 prom_getprop(node, "device_type", type, sizeof(type)); 1641 if (strcmp(type, RELOC("display")) != 0) 1642 continue; 1643 1644 /* It seems OF doesn't null-terminate the path :-( */ 1645 path = RELOC(prom_scratch); 1646 memset(path, 0, PROM_SCRATCH_SIZE); 1647 1648 /* 1649 * leave some room at the end of the path for appending extra 1650 * arguments 1651 */ 1652 if (call_prom("package-to-path", 3, 1, node, path, 1653 PROM_SCRATCH_SIZE-10) == PROM_ERROR) 1654 continue; 1655 prom_printf("found display : %s, opening... ", path); 1656 1657 ih = call_prom("open", 1, 1, path); 1658 if (ih == 0) { 1659 prom_printf("failed\n"); 1660 continue; 1661 } 1662 1663 /* Success */ 1664 prom_printf("done\n"); 1665 prom_setprop(node, path, "linux,opened", NULL, 0); 1666 1667 /* Setup a usable color table when the appropriate 1668 * method is available. Should update this to set-colors */ 1669 clut = RELOC(default_colors); 1670 for (i = 0; i < 32; i++, clut += 3) 1671 if (prom_set_color(ih, i, clut[0], clut[1], 1672 clut[2]) != 0) 1673 break; 1674 1675 #ifdef CONFIG_LOGO_LINUX_CLUT224 1676 clut = PTRRELOC(RELOC(logo_linux_clut224.clut)); 1677 for (i = 0; i < RELOC(logo_linux_clut224.clutsize); i++, clut += 3) 1678 if (prom_set_color(ih, i + 32, clut[0], clut[1], 1679 clut[2]) != 0) 1680 break; 1681 #endif /* CONFIG_LOGO_LINUX_CLUT224 */ 1682 } 1683 } 1684 1685 1686 /* Return (relocated) pointer to this much memory: moves initrd if reqd. */ 1687 static void __init *make_room(unsigned long *mem_start, unsigned long *mem_end, 1688 unsigned long needed, unsigned long align) 1689 { 1690 void *ret; 1691 1692 *mem_start = _ALIGN(*mem_start, align); 1693 while ((*mem_start + needed) > *mem_end) { 1694 unsigned long room, chunk; 1695 1696 prom_debug("Chunk exhausted, claiming more at %x...\n", 1697 RELOC(alloc_bottom)); 1698 room = RELOC(alloc_top) - RELOC(alloc_bottom); 1699 if (room > DEVTREE_CHUNK_SIZE) 1700 room = DEVTREE_CHUNK_SIZE; 1701 if (room < PAGE_SIZE) 1702 prom_panic("No memory for flatten_device_tree (no room)"); 1703 chunk = alloc_up(room, 0); 1704 if (chunk == 0) 1705 prom_panic("No memory for flatten_device_tree (claim failed)"); 1706 *mem_end = RELOC(alloc_top); 1707 } 1708 1709 ret = (void *)*mem_start; 1710 *mem_start += needed; 1711 1712 return ret; 1713 } 1714 1715 #define dt_push_token(token, mem_start, mem_end) \ 1716 do { *((u32 *)make_room(mem_start, mem_end, 4, 4)) = token; } while(0) 1717 1718 static unsigned long __init dt_find_string(char *str) 1719 { 1720 char *s, *os; 1721 1722 s = os = (char *)RELOC(dt_string_start); 1723 s += 4; 1724 while (s < (char *)RELOC(dt_string_end)) { 1725 if (strcmp(s, str) == 0) 1726 return s - os; 1727 s += strlen(s) + 1; 1728 } 1729 return 0; 1730 } 1731 1732 /* 1733 * The Open Firmware 1275 specification states properties must be 31 bytes or 1734 * less, however not all firmwares obey this. Make it 64 bytes to be safe. 1735 */ 1736 #define MAX_PROPERTY_NAME 64 1737 1738 static void __init scan_dt_build_strings(phandle node, 1739 unsigned long *mem_start, 1740 unsigned long *mem_end) 1741 { 1742 char *prev_name, *namep, *sstart; 1743 unsigned long soff; 1744 phandle child; 1745 1746 sstart = (char *)RELOC(dt_string_start); 1747 1748 /* get and store all property names */ 1749 prev_name = RELOC(""); 1750 for (;;) { 1751 /* 64 is max len of name including nul. */ 1752 namep = make_room(mem_start, mem_end, MAX_PROPERTY_NAME, 1); 1753 if (call_prom("nextprop", 3, 1, node, prev_name, namep) != 1) { 1754 /* No more nodes: unwind alloc */ 1755 *mem_start = (unsigned long)namep; 1756 break; 1757 } 1758 1759 /* skip "name" */ 1760 if (strcmp(namep, RELOC("name")) == 0) { 1761 *mem_start = (unsigned long)namep; 1762 prev_name = RELOC("name"); 1763 continue; 1764 } 1765 /* get/create string entry */ 1766 soff = dt_find_string(namep); 1767 if (soff != 0) { 1768 *mem_start = (unsigned long)namep; 1769 namep = sstart + soff; 1770 } else { 1771 /* Trim off some if we can */ 1772 *mem_start = (unsigned long)namep + strlen(namep) + 1; 1773 RELOC(dt_string_end) = *mem_start; 1774 } 1775 prev_name = namep; 1776 } 1777 1778 /* do all our children */ 1779 child = call_prom("child", 1, 1, node); 1780 while (child != 0) { 1781 scan_dt_build_strings(child, mem_start, mem_end); 1782 child = call_prom("peer", 1, 1, child); 1783 } 1784 } 1785 1786 static void __init scan_dt_build_struct(phandle node, unsigned long *mem_start, 1787 unsigned long *mem_end) 1788 { 1789 phandle child; 1790 char *namep, *prev_name, *sstart, *p, *ep, *lp, *path; 1791 unsigned long soff; 1792 unsigned char *valp; 1793 static char pname[MAX_PROPERTY_NAME]; 1794 int l, room; 1795 1796 dt_push_token(OF_DT_BEGIN_NODE, mem_start, mem_end); 1797 1798 /* get the node's full name */ 1799 namep = (char *)*mem_start; 1800 room = *mem_end - *mem_start; 1801 if (room > 255) 1802 room = 255; 1803 l = call_prom("package-to-path", 3, 1, node, namep, room); 1804 if (l >= 0) { 1805 /* Didn't fit? Get more room. */ 1806 if (l >= room) { 1807 if (l >= *mem_end - *mem_start) 1808 namep = make_room(mem_start, mem_end, l+1, 1); 1809 call_prom("package-to-path", 3, 1, node, namep, l); 1810 } 1811 namep[l] = '\0'; 1812 1813 /* Fixup an Apple bug where they have bogus \0 chars in the 1814 * middle of the path in some properties, and extract 1815 * the unit name (everything after the last '/'). 1816 */ 1817 for (lp = p = namep, ep = namep + l; p < ep; p++) { 1818 if (*p == '/') 1819 lp = namep; 1820 else if (*p != 0) 1821 *lp++ = *p; 1822 } 1823 *lp = 0; 1824 *mem_start = _ALIGN((unsigned long)lp + 1, 4); 1825 } 1826 1827 /* get it again for debugging */ 1828 path = RELOC(prom_scratch); 1829 memset(path, 0, PROM_SCRATCH_SIZE); 1830 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1); 1831 1832 /* get and store all properties */ 1833 prev_name = RELOC(""); 1834 sstart = (char *)RELOC(dt_string_start); 1835 for (;;) { 1836 if (call_prom("nextprop", 3, 1, node, prev_name, 1837 RELOC(pname)) != 1) 1838 break; 1839 1840 /* skip "name" */ 1841 if (strcmp(RELOC(pname), RELOC("name")) == 0) { 1842 prev_name = RELOC("name"); 1843 continue; 1844 } 1845 1846 /* find string offset */ 1847 soff = dt_find_string(RELOC(pname)); 1848 if (soff == 0) { 1849 prom_printf("WARNING: Can't find string index for" 1850 " <%s>, node %s\n", RELOC(pname), path); 1851 break; 1852 } 1853 prev_name = sstart + soff; 1854 1855 /* get length */ 1856 l = call_prom("getproplen", 2, 1, node, RELOC(pname)); 1857 1858 /* sanity checks */ 1859 if (l == PROM_ERROR) 1860 continue; 1861 if (l > MAX_PROPERTY_LENGTH) { 1862 prom_printf("WARNING: ignoring large property "); 1863 /* It seems OF doesn't null-terminate the path :-( */ 1864 prom_printf("[%s] ", path); 1865 prom_printf("%s length 0x%x\n", RELOC(pname), l); 1866 continue; 1867 } 1868 1869 /* push property head */ 1870 dt_push_token(OF_DT_PROP, mem_start, mem_end); 1871 dt_push_token(l, mem_start, mem_end); 1872 dt_push_token(soff, mem_start, mem_end); 1873 1874 /* push property content */ 1875 valp = make_room(mem_start, mem_end, l, 4); 1876 call_prom("getprop", 4, 1, node, RELOC(pname), valp, l); 1877 *mem_start = _ALIGN(*mem_start, 4); 1878 } 1879 1880 /* Add a "linux,phandle" property. */ 1881 soff = dt_find_string(RELOC("linux,phandle")); 1882 if (soff == 0) 1883 prom_printf("WARNING: Can't find string index for" 1884 " <linux-phandle> node %s\n", path); 1885 else { 1886 dt_push_token(OF_DT_PROP, mem_start, mem_end); 1887 dt_push_token(4, mem_start, mem_end); 1888 dt_push_token(soff, mem_start, mem_end); 1889 valp = make_room(mem_start, mem_end, 4, 4); 1890 *(u32 *)valp = node; 1891 } 1892 1893 /* do all our children */ 1894 child = call_prom("child", 1, 1, node); 1895 while (child != 0) { 1896 scan_dt_build_struct(child, mem_start, mem_end); 1897 child = call_prom("peer", 1, 1, child); 1898 } 1899 1900 dt_push_token(OF_DT_END_NODE, mem_start, mem_end); 1901 } 1902 1903 static void __init flatten_device_tree(void) 1904 { 1905 phandle root; 1906 unsigned long mem_start, mem_end, room; 1907 struct boot_param_header *hdr; 1908 struct prom_t *_prom = &RELOC(prom); 1909 char *namep; 1910 u64 *rsvmap; 1911 1912 /* 1913 * Check how much room we have between alloc top & bottom (+/- a 1914 * few pages), crop to 4Mb, as this is our "chuck" size 1915 */ 1916 room = RELOC(alloc_top) - RELOC(alloc_bottom) - 0x4000; 1917 if (room > DEVTREE_CHUNK_SIZE) 1918 room = DEVTREE_CHUNK_SIZE; 1919 prom_debug("starting device tree allocs at %x\n", RELOC(alloc_bottom)); 1920 1921 /* Now try to claim that */ 1922 mem_start = (unsigned long)alloc_up(room, PAGE_SIZE); 1923 if (mem_start == 0) 1924 prom_panic("Can't allocate initial device-tree chunk\n"); 1925 mem_end = RELOC(alloc_top); 1926 1927 /* Get root of tree */ 1928 root = call_prom("peer", 1, 1, (phandle)0); 1929 if (root == (phandle)0) 1930 prom_panic ("couldn't get device tree root\n"); 1931 1932 /* Build header and make room for mem rsv map */ 1933 mem_start = _ALIGN(mem_start, 4); 1934 hdr = make_room(&mem_start, &mem_end, 1935 sizeof(struct boot_param_header), 4); 1936 RELOC(dt_header_start) = (unsigned long)hdr; 1937 rsvmap = make_room(&mem_start, &mem_end, sizeof(mem_reserve_map), 8); 1938 1939 /* Start of strings */ 1940 mem_start = PAGE_ALIGN(mem_start); 1941 RELOC(dt_string_start) = mem_start; 1942 mem_start += 4; /* hole */ 1943 1944 /* Add "linux,phandle" in there, we'll need it */ 1945 namep = make_room(&mem_start, &mem_end, 16, 1); 1946 strcpy(namep, RELOC("linux,phandle")); 1947 mem_start = (unsigned long)namep + strlen(namep) + 1; 1948 1949 /* Build string array */ 1950 prom_printf("Building dt strings...\n"); 1951 scan_dt_build_strings(root, &mem_start, &mem_end); 1952 RELOC(dt_string_end) = mem_start; 1953 1954 /* Build structure */ 1955 mem_start = PAGE_ALIGN(mem_start); 1956 RELOC(dt_struct_start) = mem_start; 1957 prom_printf("Building dt structure...\n"); 1958 scan_dt_build_struct(root, &mem_start, &mem_end); 1959 dt_push_token(OF_DT_END, &mem_start, &mem_end); 1960 RELOC(dt_struct_end) = PAGE_ALIGN(mem_start); 1961 1962 /* Finish header */ 1963 hdr->boot_cpuid_phys = _prom->cpu; 1964 hdr->magic = OF_DT_HEADER; 1965 hdr->totalsize = RELOC(dt_struct_end) - RELOC(dt_header_start); 1966 hdr->off_dt_struct = RELOC(dt_struct_start) - RELOC(dt_header_start); 1967 hdr->off_dt_strings = RELOC(dt_string_start) - RELOC(dt_header_start); 1968 hdr->dt_strings_size = RELOC(dt_string_end) - RELOC(dt_string_start); 1969 hdr->off_mem_rsvmap = ((unsigned long)rsvmap) - RELOC(dt_header_start); 1970 hdr->version = OF_DT_VERSION; 1971 /* Version 16 is not backward compatible */ 1972 hdr->last_comp_version = 0x10; 1973 1974 /* Copy the reserve map in */ 1975 memcpy(rsvmap, RELOC(mem_reserve_map), sizeof(mem_reserve_map)); 1976 1977 #ifdef DEBUG_PROM 1978 { 1979 int i; 1980 prom_printf("reserved memory map:\n"); 1981 for (i = 0; i < RELOC(mem_reserve_cnt); i++) 1982 prom_printf(" %x - %x\n", 1983 RELOC(mem_reserve_map)[i].base, 1984 RELOC(mem_reserve_map)[i].size); 1985 } 1986 #endif 1987 /* Bump mem_reserve_cnt to cause further reservations to fail 1988 * since it's too late. 1989 */ 1990 RELOC(mem_reserve_cnt) = MEM_RESERVE_MAP_SIZE; 1991 1992 prom_printf("Device tree strings 0x%x -> 0x%x\n", 1993 RELOC(dt_string_start), RELOC(dt_string_end)); 1994 prom_printf("Device tree struct 0x%x -> 0x%x\n", 1995 RELOC(dt_struct_start), RELOC(dt_struct_end)); 1996 1997 } 1998 1999 #ifdef CONFIG_PPC_MAPLE 2000 /* PIBS Version 1.05.0000 04/26/2005 has an incorrect /ht/isa/ranges property. 2001 * The values are bad, and it doesn't even have the right number of cells. */ 2002 static void __init fixup_device_tree_maple(void) 2003 { 2004 phandle isa; 2005 u32 rloc = 0x01002000; /* IO space; PCI device = 4 */ 2006 u32 isa_ranges[6]; 2007 char *name; 2008 2009 name = "/ht@0/isa@4"; 2010 isa = call_prom("finddevice", 1, 1, ADDR(name)); 2011 if (!PHANDLE_VALID(isa)) { 2012 name = "/ht@0/isa@6"; 2013 isa = call_prom("finddevice", 1, 1, ADDR(name)); 2014 rloc = 0x01003000; /* IO space; PCI device = 6 */ 2015 } 2016 if (!PHANDLE_VALID(isa)) 2017 return; 2018 2019 if (prom_getproplen(isa, "ranges") != 12) 2020 return; 2021 if (prom_getprop(isa, "ranges", isa_ranges, sizeof(isa_ranges)) 2022 == PROM_ERROR) 2023 return; 2024 2025 if (isa_ranges[0] != 0x1 || 2026 isa_ranges[1] != 0xf4000000 || 2027 isa_ranges[2] != 0x00010000) 2028 return; 2029 2030 prom_printf("Fixing up bogus ISA range on Maple/Apache...\n"); 2031 2032 isa_ranges[0] = 0x1; 2033 isa_ranges[1] = 0x0; 2034 isa_ranges[2] = rloc; 2035 isa_ranges[3] = 0x0; 2036 isa_ranges[4] = 0x0; 2037 isa_ranges[5] = 0x00010000; 2038 prom_setprop(isa, name, "ranges", 2039 isa_ranges, sizeof(isa_ranges)); 2040 } 2041 2042 #define CPC925_MC_START 0xf8000000 2043 #define CPC925_MC_LENGTH 0x1000000 2044 /* The values for memory-controller don't have right number of cells */ 2045 static void __init fixup_device_tree_maple_memory_controller(void) 2046 { 2047 phandle mc; 2048 u32 mc_reg[4]; 2049 char *name = "/hostbridge@f8000000"; 2050 struct prom_t *_prom = &RELOC(prom); 2051 u32 ac, sc; 2052 2053 mc = call_prom("finddevice", 1, 1, ADDR(name)); 2054 if (!PHANDLE_VALID(mc)) 2055 return; 2056 2057 if (prom_getproplen(mc, "reg") != 8) 2058 return; 2059 2060 prom_getprop(_prom->root, "#address-cells", &ac, sizeof(ac)); 2061 prom_getprop(_prom->root, "#size-cells", &sc, sizeof(sc)); 2062 if ((ac != 2) || (sc != 2)) 2063 return; 2064 2065 if (prom_getprop(mc, "reg", mc_reg, sizeof(mc_reg)) == PROM_ERROR) 2066 return; 2067 2068 if (mc_reg[0] != CPC925_MC_START || mc_reg[1] != CPC925_MC_LENGTH) 2069 return; 2070 2071 prom_printf("Fixing up bogus hostbridge on Maple...\n"); 2072 2073 mc_reg[0] = 0x0; 2074 mc_reg[1] = CPC925_MC_START; 2075 mc_reg[2] = 0x0; 2076 mc_reg[3] = CPC925_MC_LENGTH; 2077 prom_setprop(mc, name, "reg", mc_reg, sizeof(mc_reg)); 2078 } 2079 #else 2080 #define fixup_device_tree_maple() 2081 #define fixup_device_tree_maple_memory_controller() 2082 #endif 2083 2084 #ifdef CONFIG_PPC_CHRP 2085 /* 2086 * Pegasos and BriQ lacks the "ranges" property in the isa node 2087 * Pegasos needs decimal IRQ 14/15, not hexadecimal 2088 * Pegasos has the IDE configured in legacy mode, but advertised as native 2089 */ 2090 static void __init fixup_device_tree_chrp(void) 2091 { 2092 phandle ph; 2093 u32 prop[6]; 2094 u32 rloc = 0x01006000; /* IO space; PCI device = 12 */ 2095 char *name; 2096 int rc; 2097 2098 name = "/pci@80000000/isa@c"; 2099 ph = call_prom("finddevice", 1, 1, ADDR(name)); 2100 if (!PHANDLE_VALID(ph)) { 2101 name = "/pci@ff500000/isa@6"; 2102 ph = call_prom("finddevice", 1, 1, ADDR(name)); 2103 rloc = 0x01003000; /* IO space; PCI device = 6 */ 2104 } 2105 if (PHANDLE_VALID(ph)) { 2106 rc = prom_getproplen(ph, "ranges"); 2107 if (rc == 0 || rc == PROM_ERROR) { 2108 prom_printf("Fixing up missing ISA range on Pegasos...\n"); 2109 2110 prop[0] = 0x1; 2111 prop[1] = 0x0; 2112 prop[2] = rloc; 2113 prop[3] = 0x0; 2114 prop[4] = 0x0; 2115 prop[5] = 0x00010000; 2116 prom_setprop(ph, name, "ranges", prop, sizeof(prop)); 2117 } 2118 } 2119 2120 name = "/pci@80000000/ide@C,1"; 2121 ph = call_prom("finddevice", 1, 1, ADDR(name)); 2122 if (PHANDLE_VALID(ph)) { 2123 prom_printf("Fixing up IDE interrupt on Pegasos...\n"); 2124 prop[0] = 14; 2125 prop[1] = 0x0; 2126 prom_setprop(ph, name, "interrupts", prop, 2*sizeof(u32)); 2127 prom_printf("Fixing up IDE class-code on Pegasos...\n"); 2128 rc = prom_getprop(ph, "class-code", prop, sizeof(u32)); 2129 if (rc == sizeof(u32)) { 2130 prop[0] &= ~0x5; 2131 prom_setprop(ph, name, "class-code", prop, sizeof(u32)); 2132 } 2133 } 2134 } 2135 #else 2136 #define fixup_device_tree_chrp() 2137 #endif 2138 2139 #if defined(CONFIG_PPC64) && defined(CONFIG_PPC_PMAC) 2140 static void __init fixup_device_tree_pmac(void) 2141 { 2142 phandle u3, i2c, mpic; 2143 u32 u3_rev; 2144 u32 interrupts[2]; 2145 u32 parent; 2146 2147 /* Some G5s have a missing interrupt definition, fix it up here */ 2148 u3 = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000")); 2149 if (!PHANDLE_VALID(u3)) 2150 return; 2151 i2c = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/i2c@f8001000")); 2152 if (!PHANDLE_VALID(i2c)) 2153 return; 2154 mpic = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/mpic@f8040000")); 2155 if (!PHANDLE_VALID(mpic)) 2156 return; 2157 2158 /* check if proper rev of u3 */ 2159 if (prom_getprop(u3, "device-rev", &u3_rev, sizeof(u3_rev)) 2160 == PROM_ERROR) 2161 return; 2162 if (u3_rev < 0x35 || u3_rev > 0x39) 2163 return; 2164 /* does it need fixup ? */ 2165 if (prom_getproplen(i2c, "interrupts") > 0) 2166 return; 2167 2168 prom_printf("fixing up bogus interrupts for u3 i2c...\n"); 2169 2170 /* interrupt on this revision of u3 is number 0 and level */ 2171 interrupts[0] = 0; 2172 interrupts[1] = 1; 2173 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupts", 2174 &interrupts, sizeof(interrupts)); 2175 parent = (u32)mpic; 2176 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupt-parent", 2177 &parent, sizeof(parent)); 2178 } 2179 #else 2180 #define fixup_device_tree_pmac() 2181 #endif 2182 2183 #ifdef CONFIG_PPC_EFIKA 2184 /* 2185 * The MPC5200 FEC driver requires an phy-handle property to tell it how 2186 * to talk to the phy. If the phy-handle property is missing, then this 2187 * function is called to add the appropriate nodes and link it to the 2188 * ethernet node. 2189 */ 2190 static void __init fixup_device_tree_efika_add_phy(void) 2191 { 2192 u32 node; 2193 char prop[64]; 2194 int rv; 2195 2196 /* Check if /builtin/ethernet exists - bail if it doesn't */ 2197 node = call_prom("finddevice", 1, 1, ADDR("/builtin/ethernet")); 2198 if (!PHANDLE_VALID(node)) 2199 return; 2200 2201 /* Check if the phy-handle property exists - bail if it does */ 2202 rv = prom_getprop(node, "phy-handle", prop, sizeof(prop)); 2203 if (!rv) 2204 return; 2205 2206 /* 2207 * At this point the ethernet device doesn't have a phy described. 2208 * Now we need to add the missing phy node and linkage 2209 */ 2210 2211 /* Check for an MDIO bus node - if missing then create one */ 2212 node = call_prom("finddevice", 1, 1, ADDR("/builtin/mdio")); 2213 if (!PHANDLE_VALID(node)) { 2214 prom_printf("Adding Ethernet MDIO node\n"); 2215 call_prom("interpret", 1, 1, 2216 " s\" /builtin\" find-device" 2217 " new-device" 2218 " 1 encode-int s\" #address-cells\" property" 2219 " 0 encode-int s\" #size-cells\" property" 2220 " s\" mdio\" device-name" 2221 " s\" fsl,mpc5200b-mdio\" encode-string" 2222 " s\" compatible\" property" 2223 " 0xf0003000 0x400 reg" 2224 " 0x2 encode-int" 2225 " 0x5 encode-int encode+" 2226 " 0x3 encode-int encode+" 2227 " s\" interrupts\" property" 2228 " finish-device"); 2229 }; 2230 2231 /* Check for a PHY device node - if missing then create one and 2232 * give it's phandle to the ethernet node */ 2233 node = call_prom("finddevice", 1, 1, 2234 ADDR("/builtin/mdio/ethernet-phy")); 2235 if (!PHANDLE_VALID(node)) { 2236 prom_printf("Adding Ethernet PHY node\n"); 2237 call_prom("interpret", 1, 1, 2238 " s\" /builtin/mdio\" find-device" 2239 " new-device" 2240 " s\" ethernet-phy\" device-name" 2241 " 0x10 encode-int s\" reg\" property" 2242 " my-self" 2243 " ihandle>phandle" 2244 " finish-device" 2245 " s\" /builtin/ethernet\" find-device" 2246 " encode-int" 2247 " s\" phy-handle\" property" 2248 " device-end"); 2249 } 2250 } 2251 2252 static void __init fixup_device_tree_efika(void) 2253 { 2254 int sound_irq[3] = { 2, 2, 0 }; 2255 int bcomm_irq[3*16] = { 3,0,0, 3,1,0, 3,2,0, 3,3,0, 2256 3,4,0, 3,5,0, 3,6,0, 3,7,0, 2257 3,8,0, 3,9,0, 3,10,0, 3,11,0, 2258 3,12,0, 3,13,0, 3,14,0, 3,15,0 }; 2259 u32 node; 2260 char prop[64]; 2261 int rv, len; 2262 2263 /* Check if we're really running on a EFIKA */ 2264 node = call_prom("finddevice", 1, 1, ADDR("/")); 2265 if (!PHANDLE_VALID(node)) 2266 return; 2267 2268 rv = prom_getprop(node, "model", prop, sizeof(prop)); 2269 if (rv == PROM_ERROR) 2270 return; 2271 if (strcmp(prop, "EFIKA5K2")) 2272 return; 2273 2274 prom_printf("Applying EFIKA device tree fixups\n"); 2275 2276 /* Claiming to be 'chrp' is death */ 2277 node = call_prom("finddevice", 1, 1, ADDR("/")); 2278 rv = prom_getprop(node, "device_type", prop, sizeof(prop)); 2279 if (rv != PROM_ERROR && (strcmp(prop, "chrp") == 0)) 2280 prom_setprop(node, "/", "device_type", "efika", sizeof("efika")); 2281 2282 /* CODEGEN,description is exposed in /proc/cpuinfo so 2283 fix that too */ 2284 rv = prom_getprop(node, "CODEGEN,description", prop, sizeof(prop)); 2285 if (rv != PROM_ERROR && (strstr(prop, "CHRP"))) 2286 prom_setprop(node, "/", "CODEGEN,description", 2287 "Efika 5200B PowerPC System", 2288 sizeof("Efika 5200B PowerPC System")); 2289 2290 /* Fixup bestcomm interrupts property */ 2291 node = call_prom("finddevice", 1, 1, ADDR("/builtin/bestcomm")); 2292 if (PHANDLE_VALID(node)) { 2293 len = prom_getproplen(node, "interrupts"); 2294 if (len == 12) { 2295 prom_printf("Fixing bestcomm interrupts property\n"); 2296 prom_setprop(node, "/builtin/bestcom", "interrupts", 2297 bcomm_irq, sizeof(bcomm_irq)); 2298 } 2299 } 2300 2301 /* Fixup sound interrupts property */ 2302 node = call_prom("finddevice", 1, 1, ADDR("/builtin/sound")); 2303 if (PHANDLE_VALID(node)) { 2304 rv = prom_getprop(node, "interrupts", prop, sizeof(prop)); 2305 if (rv == PROM_ERROR) { 2306 prom_printf("Adding sound interrupts property\n"); 2307 prom_setprop(node, "/builtin/sound", "interrupts", 2308 sound_irq, sizeof(sound_irq)); 2309 } 2310 } 2311 2312 /* Make sure ethernet phy-handle property exists */ 2313 fixup_device_tree_efika_add_phy(); 2314 } 2315 #else 2316 #define fixup_device_tree_efika() 2317 #endif 2318 2319 static void __init fixup_device_tree(void) 2320 { 2321 fixup_device_tree_maple(); 2322 fixup_device_tree_maple_memory_controller(); 2323 fixup_device_tree_chrp(); 2324 fixup_device_tree_pmac(); 2325 fixup_device_tree_efika(); 2326 } 2327 2328 static void __init prom_find_boot_cpu(void) 2329 { 2330 struct prom_t *_prom = &RELOC(prom); 2331 u32 getprop_rval; 2332 ihandle prom_cpu; 2333 phandle cpu_pkg; 2334 2335 _prom->cpu = 0; 2336 if (prom_getprop(_prom->chosen, "cpu", &prom_cpu, sizeof(prom_cpu)) <= 0) 2337 return; 2338 2339 cpu_pkg = call_prom("instance-to-package", 1, 1, prom_cpu); 2340 2341 prom_getprop(cpu_pkg, "reg", &getprop_rval, sizeof(getprop_rval)); 2342 _prom->cpu = getprop_rval; 2343 2344 prom_debug("Booting CPU hw index = 0x%x\n", _prom->cpu); 2345 } 2346 2347 static void __init prom_check_initrd(unsigned long r3, unsigned long r4) 2348 { 2349 #ifdef CONFIG_BLK_DEV_INITRD 2350 struct prom_t *_prom = &RELOC(prom); 2351 2352 if (r3 && r4 && r4 != 0xdeadbeef) { 2353 unsigned long val; 2354 2355 RELOC(prom_initrd_start) = is_kernel_addr(r3) ? __pa(r3) : r3; 2356 RELOC(prom_initrd_end) = RELOC(prom_initrd_start) + r4; 2357 2358 val = RELOC(prom_initrd_start); 2359 prom_setprop(_prom->chosen, "/chosen", "linux,initrd-start", 2360 &val, sizeof(val)); 2361 val = RELOC(prom_initrd_end); 2362 prom_setprop(_prom->chosen, "/chosen", "linux,initrd-end", 2363 &val, sizeof(val)); 2364 2365 reserve_mem(RELOC(prom_initrd_start), 2366 RELOC(prom_initrd_end) - RELOC(prom_initrd_start)); 2367 2368 prom_debug("initrd_start=0x%x\n", RELOC(prom_initrd_start)); 2369 prom_debug("initrd_end=0x%x\n", RELOC(prom_initrd_end)); 2370 } 2371 #endif /* CONFIG_BLK_DEV_INITRD */ 2372 } 2373 2374 /* 2375 * We enter here early on, when the Open Firmware prom is still 2376 * handling exceptions and the MMU hash table for us. 2377 */ 2378 2379 unsigned long __init prom_init(unsigned long r3, unsigned long r4, 2380 unsigned long pp, 2381 unsigned long r6, unsigned long r7, 2382 unsigned long kbase) 2383 { 2384 struct prom_t *_prom; 2385 unsigned long hdr; 2386 2387 #ifdef CONFIG_PPC32 2388 unsigned long offset = reloc_offset(); 2389 reloc_got2(offset); 2390 #endif 2391 2392 _prom = &RELOC(prom); 2393 2394 /* 2395 * First zero the BSS 2396 */ 2397 memset(&RELOC(__bss_start), 0, __bss_stop - __bss_start); 2398 2399 /* 2400 * Init interface to Open Firmware, get some node references, 2401 * like /chosen 2402 */ 2403 prom_init_client_services(pp); 2404 2405 /* 2406 * See if this OF is old enough that we need to do explicit maps 2407 * and other workarounds 2408 */ 2409 prom_find_mmu(); 2410 2411 /* 2412 * Init prom stdout device 2413 */ 2414 prom_init_stdout(); 2415 2416 prom_printf("Preparing to boot %s", RELOC(linux_banner)); 2417 2418 /* 2419 * Get default machine type. At this point, we do not differentiate 2420 * between pSeries SMP and pSeries LPAR 2421 */ 2422 RELOC(of_platform) = prom_find_machine_type(); 2423 2424 #ifndef CONFIG_RELOCATABLE 2425 /* Bail if this is a kdump kernel. */ 2426 if (PHYSICAL_START > 0) 2427 prom_panic("Error: You can't boot a kdump kernel from OF!\n"); 2428 #endif 2429 2430 /* 2431 * Check for an initrd 2432 */ 2433 prom_check_initrd(r3, r4); 2434 2435 #ifdef CONFIG_PPC_PSERIES 2436 /* 2437 * On pSeries, inform the firmware about our capabilities 2438 */ 2439 if (RELOC(of_platform) == PLATFORM_PSERIES || 2440 RELOC(of_platform) == PLATFORM_PSERIES_LPAR) 2441 prom_send_capabilities(); 2442 #endif 2443 2444 /* 2445 * Copy the CPU hold code 2446 */ 2447 if (RELOC(of_platform) != PLATFORM_POWERMAC) 2448 copy_and_flush(0, kbase, 0x100, 0); 2449 2450 /* 2451 * Do early parsing of command line 2452 */ 2453 early_cmdline_parse(); 2454 2455 /* 2456 * Initialize memory management within prom_init 2457 */ 2458 prom_init_mem(); 2459 2460 /* 2461 * Determine which cpu is actually running right _now_ 2462 */ 2463 prom_find_boot_cpu(); 2464 2465 /* 2466 * Initialize display devices 2467 */ 2468 prom_check_displays(); 2469 2470 #ifdef CONFIG_PPC64 2471 /* 2472 * Initialize IOMMU (TCE tables) on pSeries. Do that before anything else 2473 * that uses the allocator, we need to make sure we get the top of memory 2474 * available for us here... 2475 */ 2476 if (RELOC(of_platform) == PLATFORM_PSERIES) 2477 prom_initialize_tce_table(); 2478 #endif 2479 2480 /* 2481 * On non-powermacs, try to instantiate RTAS and puts all CPUs 2482 * in spin-loops. PowerMacs don't have a working RTAS and use 2483 * a different way to spin CPUs 2484 */ 2485 if (RELOC(of_platform) != PLATFORM_POWERMAC) { 2486 prom_instantiate_rtas(); 2487 prom_hold_cpus(); 2488 } 2489 2490 /* 2491 * Fill in some infos for use by the kernel later on 2492 */ 2493 if (RELOC(prom_memory_limit)) 2494 prom_setprop(_prom->chosen, "/chosen", "linux,memory-limit", 2495 &RELOC(prom_memory_limit), 2496 sizeof(prom_memory_limit)); 2497 #ifdef CONFIG_PPC64 2498 if (RELOC(prom_iommu_off)) 2499 prom_setprop(_prom->chosen, "/chosen", "linux,iommu-off", 2500 NULL, 0); 2501 2502 if (RELOC(prom_iommu_force_on)) 2503 prom_setprop(_prom->chosen, "/chosen", "linux,iommu-force-on", 2504 NULL, 0); 2505 2506 if (RELOC(prom_tce_alloc_start)) { 2507 prom_setprop(_prom->chosen, "/chosen", "linux,tce-alloc-start", 2508 &RELOC(prom_tce_alloc_start), 2509 sizeof(prom_tce_alloc_start)); 2510 prom_setprop(_prom->chosen, "/chosen", "linux,tce-alloc-end", 2511 &RELOC(prom_tce_alloc_end), 2512 sizeof(prom_tce_alloc_end)); 2513 } 2514 #endif 2515 2516 /* 2517 * Fixup any known bugs in the device-tree 2518 */ 2519 fixup_device_tree(); 2520 2521 /* 2522 * Now finally create the flattened device-tree 2523 */ 2524 prom_printf("copying OF device tree...\n"); 2525 flatten_device_tree(); 2526 2527 /* 2528 * in case stdin is USB and still active on IBM machines... 2529 * Unfortunately quiesce crashes on some powermacs if we have 2530 * closed stdin already (in particular the powerbook 101). 2531 */ 2532 if (RELOC(of_platform) != PLATFORM_POWERMAC) 2533 prom_close_stdin(); 2534 2535 /* 2536 * Call OF "quiesce" method to shut down pending DMA's from 2537 * devices etc... 2538 */ 2539 prom_printf("Calling quiesce...\n"); 2540 call_prom("quiesce", 0, 0); 2541 2542 /* 2543 * And finally, call the kernel passing it the flattened device 2544 * tree and NULL as r5, thus triggering the new entry point which 2545 * is common to us and kexec 2546 */ 2547 hdr = RELOC(dt_header_start); 2548 prom_printf("returning from prom_init\n"); 2549 prom_debug("->dt_header_start=0x%x\n", hdr); 2550 2551 #ifdef CONFIG_PPC32 2552 reloc_got2(-offset); 2553 #endif 2554 2555 __start(hdr, kbase, 0); 2556 2557 return 0; 2558 } 2559