1 /* 2 * Procedures for interfacing to Open Firmware. 3 * 4 * Paul Mackerras August 1996. 5 * Copyright (C) 1996-2005 Paul Mackerras. 6 * 7 * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner. 8 * {engebret|bergner}@us.ibm.com 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License 12 * as published by the Free Software Foundation; either version 13 * 2 of the License, or (at your option) any later version. 14 */ 15 16 #undef DEBUG_PROM 17 18 #include <stdarg.h> 19 #include <linux/kernel.h> 20 #include <linux/string.h> 21 #include <linux/init.h> 22 #include <linux/threads.h> 23 #include <linux/spinlock.h> 24 #include <linux/types.h> 25 #include <linux/pci.h> 26 #include <linux/proc_fs.h> 27 #include <linux/stringify.h> 28 #include <linux/delay.h> 29 #include <linux/initrd.h> 30 #include <linux/bitops.h> 31 #include <asm/prom.h> 32 #include <asm/rtas.h> 33 #include <asm/page.h> 34 #include <asm/processor.h> 35 #include <asm/irq.h> 36 #include <asm/io.h> 37 #include <asm/smp.h> 38 #include <asm/system.h> 39 #include <asm/mmu.h> 40 #include <asm/pgtable.h> 41 #include <asm/pci.h> 42 #include <asm/iommu.h> 43 #include <asm/btext.h> 44 #include <asm/sections.h> 45 #include <asm/machdep.h> 46 47 #include <linux/linux_logo.h> 48 49 /* 50 * Properties whose value is longer than this get excluded from our 51 * copy of the device tree. This value does need to be big enough to 52 * ensure that we don't lose things like the interrupt-map property 53 * on a PCI-PCI bridge. 54 */ 55 #define MAX_PROPERTY_LENGTH (1UL * 1024 * 1024) 56 57 /* 58 * Eventually bump that one up 59 */ 60 #define DEVTREE_CHUNK_SIZE 0x100000 61 62 /* 63 * This is the size of the local memory reserve map that gets copied 64 * into the boot params passed to the kernel. That size is totally 65 * flexible as the kernel just reads the list until it encounters an 66 * entry with size 0, so it can be changed without breaking binary 67 * compatibility 68 */ 69 #define MEM_RESERVE_MAP_SIZE 8 70 71 /* 72 * prom_init() is called very early on, before the kernel text 73 * and data have been mapped to KERNELBASE. At this point the code 74 * is running at whatever address it has been loaded at. 75 * On ppc32 we compile with -mrelocatable, which means that references 76 * to extern and static variables get relocated automatically. 77 * On ppc64 we have to relocate the references explicitly with 78 * RELOC. (Note that strings count as static variables.) 79 * 80 * Because OF may have mapped I/O devices into the area starting at 81 * KERNELBASE, particularly on CHRP machines, we can't safely call 82 * OF once the kernel has been mapped to KERNELBASE. Therefore all 83 * OF calls must be done within prom_init(). 84 * 85 * ADDR is used in calls to call_prom. The 4th and following 86 * arguments to call_prom should be 32-bit values. 87 * On ppc64, 64 bit values are truncated to 32 bits (and 88 * fortunately don't get interpreted as two arguments). 89 */ 90 #ifdef CONFIG_PPC64 91 #define RELOC(x) (*PTRRELOC(&(x))) 92 #define ADDR(x) (u32) add_reloc_offset((unsigned long)(x)) 93 #define OF_WORKAROUNDS 0 94 #else 95 #define RELOC(x) (x) 96 #define ADDR(x) (u32) (x) 97 #define OF_WORKAROUNDS of_workarounds 98 int of_workarounds; 99 #endif 100 101 #define OF_WA_CLAIM 1 /* do phys/virt claim separately, then map */ 102 #define OF_WA_LONGTRAIL 2 /* work around longtrail bugs */ 103 104 #define PROM_BUG() do { \ 105 prom_printf("kernel BUG at %s line 0x%x!\n", \ 106 RELOC(__FILE__), __LINE__); \ 107 __asm__ __volatile__(".long " BUG_ILLEGAL_INSTR); \ 108 } while (0) 109 110 #ifdef DEBUG_PROM 111 #define prom_debug(x...) prom_printf(x) 112 #else 113 #define prom_debug(x...) 114 #endif 115 116 117 typedef u32 prom_arg_t; 118 119 struct prom_args { 120 u32 service; 121 u32 nargs; 122 u32 nret; 123 prom_arg_t args[10]; 124 }; 125 126 struct prom_t { 127 ihandle root; 128 phandle chosen; 129 int cpu; 130 ihandle stdout; 131 ihandle mmumap; 132 ihandle memory; 133 }; 134 135 struct mem_map_entry { 136 u64 base; 137 u64 size; 138 }; 139 140 typedef u32 cell_t; 141 142 extern void __start(unsigned long r3, unsigned long r4, unsigned long r5); 143 144 #ifdef CONFIG_PPC64 145 extern int enter_prom(struct prom_args *args, unsigned long entry); 146 #else 147 static inline int enter_prom(struct prom_args *args, unsigned long entry) 148 { 149 return ((int (*)(struct prom_args *))entry)(args); 150 } 151 #endif 152 153 extern void copy_and_flush(unsigned long dest, unsigned long src, 154 unsigned long size, unsigned long offset); 155 156 /* prom structure */ 157 static struct prom_t __initdata prom; 158 159 static unsigned long prom_entry __initdata; 160 161 #define PROM_SCRATCH_SIZE 256 162 163 static char __initdata of_stdout_device[256]; 164 static char __initdata prom_scratch[PROM_SCRATCH_SIZE]; 165 166 static unsigned long __initdata dt_header_start; 167 static unsigned long __initdata dt_struct_start, dt_struct_end; 168 static unsigned long __initdata dt_string_start, dt_string_end; 169 170 static unsigned long __initdata prom_initrd_start, prom_initrd_end; 171 172 #ifdef CONFIG_PPC64 173 static int __initdata prom_iommu_force_on; 174 static int __initdata prom_iommu_off; 175 static unsigned long __initdata prom_tce_alloc_start; 176 static unsigned long __initdata prom_tce_alloc_end; 177 #endif 178 179 /* Platforms codes are now obsolete in the kernel. Now only used within this 180 * file and ultimately gone too. Feel free to change them if you need, they 181 * are not shared with anything outside of this file anymore 182 */ 183 #define PLATFORM_PSERIES 0x0100 184 #define PLATFORM_PSERIES_LPAR 0x0101 185 #define PLATFORM_LPAR 0x0001 186 #define PLATFORM_POWERMAC 0x0400 187 #define PLATFORM_GENERIC 0x0500 188 189 static int __initdata of_platform; 190 191 static char __initdata prom_cmd_line[COMMAND_LINE_SIZE]; 192 193 static unsigned long __initdata prom_memory_limit; 194 195 static unsigned long __initdata alloc_top; 196 static unsigned long __initdata alloc_top_high; 197 static unsigned long __initdata alloc_bottom; 198 static unsigned long __initdata rmo_top; 199 static unsigned long __initdata ram_top; 200 201 static struct mem_map_entry __initdata mem_reserve_map[MEM_RESERVE_MAP_SIZE]; 202 static int __initdata mem_reserve_cnt; 203 204 static cell_t __initdata regbuf[1024]; 205 206 207 /* 208 * Error results ... some OF calls will return "-1" on error, some 209 * will return 0, some will return either. To simplify, here are 210 * macros to use with any ihandle or phandle return value to check if 211 * it is valid 212 */ 213 214 #define PROM_ERROR (-1u) 215 #define PHANDLE_VALID(p) ((p) != 0 && (p) != PROM_ERROR) 216 #define IHANDLE_VALID(i) ((i) != 0 && (i) != PROM_ERROR) 217 218 219 /* This is the one and *ONLY* place where we actually call open 220 * firmware. 221 */ 222 223 static int __init call_prom(const char *service, int nargs, int nret, ...) 224 { 225 int i; 226 struct prom_args args; 227 va_list list; 228 229 args.service = ADDR(service); 230 args.nargs = nargs; 231 args.nret = nret; 232 233 va_start(list, nret); 234 for (i = 0; i < nargs; i++) 235 args.args[i] = va_arg(list, prom_arg_t); 236 va_end(list); 237 238 for (i = 0; i < nret; i++) 239 args.args[nargs+i] = 0; 240 241 if (enter_prom(&args, RELOC(prom_entry)) < 0) 242 return PROM_ERROR; 243 244 return (nret > 0) ? args.args[nargs] : 0; 245 } 246 247 static int __init call_prom_ret(const char *service, int nargs, int nret, 248 prom_arg_t *rets, ...) 249 { 250 int i; 251 struct prom_args args; 252 va_list list; 253 254 args.service = ADDR(service); 255 args.nargs = nargs; 256 args.nret = nret; 257 258 va_start(list, rets); 259 for (i = 0; i < nargs; i++) 260 args.args[i] = va_arg(list, prom_arg_t); 261 va_end(list); 262 263 for (i = 0; i < nret; i++) 264 args.args[nargs+i] = 0; 265 266 if (enter_prom(&args, RELOC(prom_entry)) < 0) 267 return PROM_ERROR; 268 269 if (rets != NULL) 270 for (i = 1; i < nret; ++i) 271 rets[i-1] = args.args[nargs+i]; 272 273 return (nret > 0) ? args.args[nargs] : 0; 274 } 275 276 277 static void __init prom_print(const char *msg) 278 { 279 const char *p, *q; 280 struct prom_t *_prom = &RELOC(prom); 281 282 if (_prom->stdout == 0) 283 return; 284 285 for (p = msg; *p != 0; p = q) { 286 for (q = p; *q != 0 && *q != '\n'; ++q) 287 ; 288 if (q > p) 289 call_prom("write", 3, 1, _prom->stdout, p, q - p); 290 if (*q == 0) 291 break; 292 ++q; 293 call_prom("write", 3, 1, _prom->stdout, ADDR("\r\n"), 2); 294 } 295 } 296 297 298 static void __init prom_print_hex(unsigned long val) 299 { 300 int i, nibbles = sizeof(val)*2; 301 char buf[sizeof(val)*2+1]; 302 struct prom_t *_prom = &RELOC(prom); 303 304 for (i = nibbles-1; i >= 0; i--) { 305 buf[i] = (val & 0xf) + '0'; 306 if (buf[i] > '9') 307 buf[i] += ('a'-'0'-10); 308 val >>= 4; 309 } 310 buf[nibbles] = '\0'; 311 call_prom("write", 3, 1, _prom->stdout, buf, nibbles); 312 } 313 314 /* max number of decimal digits in an unsigned long */ 315 #define UL_DIGITS 21 316 static void __init prom_print_dec(unsigned long val) 317 { 318 int i, size; 319 char buf[UL_DIGITS+1]; 320 struct prom_t *_prom = &RELOC(prom); 321 322 for (i = UL_DIGITS-1; i >= 0; i--) { 323 buf[i] = (val % 10) + '0'; 324 val = val/10; 325 if (val == 0) 326 break; 327 } 328 /* shift stuff down */ 329 size = UL_DIGITS - i; 330 call_prom("write", 3, 1, _prom->stdout, buf+i, size); 331 } 332 333 static void __init prom_printf(const char *format, ...) 334 { 335 const char *p, *q, *s; 336 va_list args; 337 unsigned long v; 338 long vs; 339 struct prom_t *_prom = &RELOC(prom); 340 341 va_start(args, format); 342 #ifdef CONFIG_PPC64 343 format = PTRRELOC(format); 344 #endif 345 for (p = format; *p != 0; p = q) { 346 for (q = p; *q != 0 && *q != '\n' && *q != '%'; ++q) 347 ; 348 if (q > p) 349 call_prom("write", 3, 1, _prom->stdout, p, q - p); 350 if (*q == 0) 351 break; 352 if (*q == '\n') { 353 ++q; 354 call_prom("write", 3, 1, _prom->stdout, 355 ADDR("\r\n"), 2); 356 continue; 357 } 358 ++q; 359 if (*q == 0) 360 break; 361 switch (*q) { 362 case 's': 363 ++q; 364 s = va_arg(args, const char *); 365 prom_print(s); 366 break; 367 case 'x': 368 ++q; 369 v = va_arg(args, unsigned long); 370 prom_print_hex(v); 371 break; 372 case 'd': 373 ++q; 374 vs = va_arg(args, int); 375 if (vs < 0) { 376 prom_print(RELOC("-")); 377 vs = -vs; 378 } 379 prom_print_dec(vs); 380 break; 381 case 'l': 382 ++q; 383 if (*q == 0) 384 break; 385 else if (*q == 'x') { 386 ++q; 387 v = va_arg(args, unsigned long); 388 prom_print_hex(v); 389 } else if (*q == 'u') { /* '%lu' */ 390 ++q; 391 v = va_arg(args, unsigned long); 392 prom_print_dec(v); 393 } else if (*q == 'd') { /* %ld */ 394 ++q; 395 vs = va_arg(args, long); 396 if (vs < 0) { 397 prom_print(RELOC("-")); 398 vs = -vs; 399 } 400 prom_print_dec(vs); 401 } 402 break; 403 } 404 } 405 } 406 407 408 static unsigned int __init prom_claim(unsigned long virt, unsigned long size, 409 unsigned long align) 410 { 411 struct prom_t *_prom = &RELOC(prom); 412 413 if (align == 0 && (OF_WORKAROUNDS & OF_WA_CLAIM)) { 414 /* 415 * Old OF requires we claim physical and virtual separately 416 * and then map explicitly (assuming virtual mode) 417 */ 418 int ret; 419 prom_arg_t result; 420 421 ret = call_prom_ret("call-method", 5, 2, &result, 422 ADDR("claim"), _prom->memory, 423 align, size, virt); 424 if (ret != 0 || result == -1) 425 return -1; 426 ret = call_prom_ret("call-method", 5, 2, &result, 427 ADDR("claim"), _prom->mmumap, 428 align, size, virt); 429 if (ret != 0) { 430 call_prom("call-method", 4, 1, ADDR("release"), 431 _prom->memory, size, virt); 432 return -1; 433 } 434 /* the 0x12 is M (coherence) + PP == read/write */ 435 call_prom("call-method", 6, 1, 436 ADDR("map"), _prom->mmumap, 0x12, size, virt, virt); 437 return virt; 438 } 439 return call_prom("claim", 3, 1, (prom_arg_t)virt, (prom_arg_t)size, 440 (prom_arg_t)align); 441 } 442 443 static void __init __attribute__((noreturn)) prom_panic(const char *reason) 444 { 445 #ifdef CONFIG_PPC64 446 reason = PTRRELOC(reason); 447 #endif 448 prom_print(reason); 449 /* Do not call exit because it clears the screen on pmac 450 * it also causes some sort of double-fault on early pmacs */ 451 if (RELOC(of_platform) == PLATFORM_POWERMAC) 452 asm("trap\n"); 453 454 /* ToDo: should put up an SRC here on p/iSeries */ 455 call_prom("exit", 0, 0); 456 457 for (;;) /* should never get here */ 458 ; 459 } 460 461 462 static int __init prom_next_node(phandle *nodep) 463 { 464 phandle node; 465 466 if ((node = *nodep) != 0 467 && (*nodep = call_prom("child", 1, 1, node)) != 0) 468 return 1; 469 if ((*nodep = call_prom("peer", 1, 1, node)) != 0) 470 return 1; 471 for (;;) { 472 if ((node = call_prom("parent", 1, 1, node)) == 0) 473 return 0; 474 if ((*nodep = call_prom("peer", 1, 1, node)) != 0) 475 return 1; 476 } 477 } 478 479 static int inline prom_getprop(phandle node, const char *pname, 480 void *value, size_t valuelen) 481 { 482 return call_prom("getprop", 4, 1, node, ADDR(pname), 483 (u32)(unsigned long) value, (u32) valuelen); 484 } 485 486 static int inline prom_getproplen(phandle node, const char *pname) 487 { 488 return call_prom("getproplen", 2, 1, node, ADDR(pname)); 489 } 490 491 static void add_string(char **str, const char *q) 492 { 493 char *p = *str; 494 495 while (*q) 496 *p++ = *q++; 497 *p++ = ' '; 498 *str = p; 499 } 500 501 static char *tohex(unsigned int x) 502 { 503 static char digits[] = "0123456789abcdef"; 504 static char result[9]; 505 int i; 506 507 result[8] = 0; 508 i = 8; 509 do { 510 --i; 511 result[i] = digits[x & 0xf]; 512 x >>= 4; 513 } while (x != 0 && i > 0); 514 return &result[i]; 515 } 516 517 static int __init prom_setprop(phandle node, const char *nodename, 518 const char *pname, void *value, size_t valuelen) 519 { 520 char cmd[256], *p; 521 522 if (!(OF_WORKAROUNDS & OF_WA_LONGTRAIL)) 523 return call_prom("setprop", 4, 1, node, ADDR(pname), 524 (u32)(unsigned long) value, (u32) valuelen); 525 526 /* gah... setprop doesn't work on longtrail, have to use interpret */ 527 p = cmd; 528 add_string(&p, "dev"); 529 add_string(&p, nodename); 530 add_string(&p, tohex((u32)(unsigned long) value)); 531 add_string(&p, tohex(valuelen)); 532 add_string(&p, tohex(ADDR(pname))); 533 add_string(&p, tohex(strlen(RELOC(pname)))); 534 add_string(&p, "property"); 535 *p = 0; 536 return call_prom("interpret", 1, 1, (u32)(unsigned long) cmd); 537 } 538 539 /* We can't use the standard versions because of RELOC headaches. */ 540 #define isxdigit(c) (('0' <= (c) && (c) <= '9') \ 541 || ('a' <= (c) && (c) <= 'f') \ 542 || ('A' <= (c) && (c) <= 'F')) 543 544 #define isdigit(c) ('0' <= (c) && (c) <= '9') 545 #define islower(c) ('a' <= (c) && (c) <= 'z') 546 #define toupper(c) (islower(c) ? ((c) - 'a' + 'A') : (c)) 547 548 unsigned long prom_strtoul(const char *cp, const char **endp) 549 { 550 unsigned long result = 0, base = 10, value; 551 552 if (*cp == '0') { 553 base = 8; 554 cp++; 555 if (toupper(*cp) == 'X') { 556 cp++; 557 base = 16; 558 } 559 } 560 561 while (isxdigit(*cp) && 562 (value = isdigit(*cp) ? *cp - '0' : toupper(*cp) - 'A' + 10) < base) { 563 result = result * base + value; 564 cp++; 565 } 566 567 if (endp) 568 *endp = cp; 569 570 return result; 571 } 572 573 unsigned long prom_memparse(const char *ptr, const char **retptr) 574 { 575 unsigned long ret = prom_strtoul(ptr, retptr); 576 int shift = 0; 577 578 /* 579 * We can't use a switch here because GCC *may* generate a 580 * jump table which won't work, because we're not running at 581 * the address we're linked at. 582 */ 583 if ('G' == **retptr || 'g' == **retptr) 584 shift = 30; 585 586 if ('M' == **retptr || 'm' == **retptr) 587 shift = 20; 588 589 if ('K' == **retptr || 'k' == **retptr) 590 shift = 10; 591 592 if (shift) { 593 ret <<= shift; 594 (*retptr)++; 595 } 596 597 return ret; 598 } 599 600 /* 601 * Early parsing of the command line passed to the kernel, used for 602 * "mem=x" and the options that affect the iommu 603 */ 604 static void __init early_cmdline_parse(void) 605 { 606 struct prom_t *_prom = &RELOC(prom); 607 const char *opt; 608 609 char *p; 610 int l = 0; 611 612 RELOC(prom_cmd_line[0]) = 0; 613 p = RELOC(prom_cmd_line); 614 if ((long)_prom->chosen > 0) 615 l = prom_getprop(_prom->chosen, "bootargs", p, COMMAND_LINE_SIZE-1); 616 #ifdef CONFIG_CMDLINE 617 if (l <= 0 || p[0] == '\0') /* dbl check */ 618 strlcpy(RELOC(prom_cmd_line), 619 RELOC(CONFIG_CMDLINE), sizeof(prom_cmd_line)); 620 #endif /* CONFIG_CMDLINE */ 621 prom_printf("command line: %s\n", RELOC(prom_cmd_line)); 622 623 #ifdef CONFIG_PPC64 624 opt = strstr(RELOC(prom_cmd_line), RELOC("iommu=")); 625 if (opt) { 626 prom_printf("iommu opt is: %s\n", opt); 627 opt += 6; 628 while (*opt && *opt == ' ') 629 opt++; 630 if (!strncmp(opt, RELOC("off"), 3)) 631 RELOC(prom_iommu_off) = 1; 632 else if (!strncmp(opt, RELOC("force"), 5)) 633 RELOC(prom_iommu_force_on) = 1; 634 } 635 #endif 636 opt = strstr(RELOC(prom_cmd_line), RELOC("mem=")); 637 if (opt) { 638 opt += 4; 639 RELOC(prom_memory_limit) = prom_memparse(opt, (const char **)&opt); 640 #ifdef CONFIG_PPC64 641 /* Align to 16 MB == size of ppc64 large page */ 642 RELOC(prom_memory_limit) = ALIGN(RELOC(prom_memory_limit), 0x1000000); 643 #endif 644 } 645 } 646 647 #ifdef CONFIG_PPC_PSERIES 648 /* 649 * There are two methods for telling firmware what our capabilities are. 650 * Newer machines have an "ibm,client-architecture-support" method on the 651 * root node. For older machines, we have to call the "process-elf-header" 652 * method in the /packages/elf-loader node, passing it a fake 32-bit 653 * ELF header containing a couple of PT_NOTE sections that contain 654 * structures that contain various information. 655 */ 656 657 /* 658 * New method - extensible architecture description vector. 659 * 660 * Because the description vector contains a mix of byte and word 661 * values, we declare it as an unsigned char array, and use this 662 * macro to put word values in. 663 */ 664 #define W(x) ((x) >> 24) & 0xff, ((x) >> 16) & 0xff, \ 665 ((x) >> 8) & 0xff, (x) & 0xff 666 667 /* Option vector bits - generic bits in byte 1 */ 668 #define OV_IGNORE 0x80 /* ignore this vector */ 669 #define OV_CESSATION_POLICY 0x40 /* halt if unsupported option present*/ 670 671 /* Option vector 1: processor architectures supported */ 672 #define OV1_PPC_2_00 0x80 /* set if we support PowerPC 2.00 */ 673 #define OV1_PPC_2_01 0x40 /* set if we support PowerPC 2.01 */ 674 #define OV1_PPC_2_02 0x20 /* set if we support PowerPC 2.02 */ 675 #define OV1_PPC_2_03 0x10 /* set if we support PowerPC 2.03 */ 676 #define OV1_PPC_2_04 0x08 /* set if we support PowerPC 2.04 */ 677 #define OV1_PPC_2_05 0x04 /* set if we support PowerPC 2.05 */ 678 #define OV1_PPC_2_06 0x02 /* set if we support PowerPC 2.06 */ 679 680 /* Option vector 2: Open Firmware options supported */ 681 #define OV2_REAL_MODE 0x20 /* set if we want OF in real mode */ 682 683 /* Option vector 3: processor options supported */ 684 #define OV3_FP 0x80 /* floating point */ 685 #define OV3_VMX 0x40 /* VMX/Altivec */ 686 #define OV3_DFP 0x20 /* decimal FP */ 687 688 /* Option vector 5: PAPR/OF options supported */ 689 #define OV5_LPAR 0x80 /* logical partitioning supported */ 690 #define OV5_SPLPAR 0x40 /* shared-processor LPAR supported */ 691 /* ibm,dynamic-reconfiguration-memory property supported */ 692 #define OV5_DRCONF_MEMORY 0x20 693 #define OV5_LARGE_PAGES 0x10 /* large pages supported */ 694 #define OV5_DONATE_DEDICATE_CPU 0x02 /* donate dedicated CPU support */ 695 /* PCIe/MSI support. Without MSI full PCIe is not supported */ 696 #ifdef CONFIG_PCI_MSI 697 #define OV5_MSI 0x01 /* PCIe/MSI support */ 698 #else 699 #define OV5_MSI 0x00 700 #endif /* CONFIG_PCI_MSI */ 701 #ifdef CONFIG_PPC_SMLPAR 702 #define OV5_CMO 0x80 /* Cooperative Memory Overcommitment */ 703 #define OV5_XCMO 0x40 /* Page Coalescing */ 704 #else 705 #define OV5_CMO 0x00 706 #define OV5_XCMO 0x00 707 #endif 708 #define OV5_TYPE1_AFFINITY 0x80 /* Type 1 NUMA affinity */ 709 710 /* Option Vector 6: IBM PAPR hints */ 711 #define OV6_LINUX 0x02 /* Linux is our OS */ 712 713 /* 714 * The architecture vector has an array of PVR mask/value pairs, 715 * followed by # option vectors - 1, followed by the option vectors. 716 */ 717 static unsigned char ibm_architecture_vec[] = { 718 W(0xfffe0000), W(0x003a0000), /* POWER5/POWER5+ */ 719 W(0xffff0000), W(0x003e0000), /* POWER6 */ 720 W(0xffff0000), W(0x003f0000), /* POWER7 */ 721 W(0xffffffff), W(0x0f000003), /* all 2.06-compliant */ 722 W(0xffffffff), W(0x0f000002), /* all 2.05-compliant */ 723 W(0xfffffffe), W(0x0f000001), /* all 2.04-compliant and earlier */ 724 6 - 1, /* 6 option vectors */ 725 726 /* option vector 1: processor architectures supported */ 727 3 - 2, /* length */ 728 0, /* don't ignore, don't halt */ 729 OV1_PPC_2_00 | OV1_PPC_2_01 | OV1_PPC_2_02 | OV1_PPC_2_03 | 730 OV1_PPC_2_04 | OV1_PPC_2_05 | OV1_PPC_2_06, 731 732 /* option vector 2: Open Firmware options supported */ 733 34 - 2, /* length */ 734 OV2_REAL_MODE, 735 0, 0, 736 W(0xffffffff), /* real_base */ 737 W(0xffffffff), /* real_size */ 738 W(0xffffffff), /* virt_base */ 739 W(0xffffffff), /* virt_size */ 740 W(0xffffffff), /* load_base */ 741 W(64), /* 64MB min RMA */ 742 W(0xffffffff), /* full client load */ 743 0, /* min RMA percentage of total RAM */ 744 48, /* max log_2(hash table size) */ 745 746 /* option vector 3: processor options supported */ 747 3 - 2, /* length */ 748 0, /* don't ignore, don't halt */ 749 OV3_FP | OV3_VMX | OV3_DFP, 750 751 /* option vector 4: IBM PAPR implementation */ 752 2 - 2, /* length */ 753 0, /* don't halt */ 754 755 /* option vector 5: PAPR/OF options */ 756 13 - 2, /* length */ 757 0, /* don't ignore, don't halt */ 758 OV5_LPAR | OV5_SPLPAR | OV5_LARGE_PAGES | OV5_DRCONF_MEMORY | 759 OV5_DONATE_DEDICATE_CPU | OV5_MSI, 760 0, 761 OV5_CMO | OV5_XCMO, 762 OV5_TYPE1_AFFINITY, 763 0, 764 0, 765 0, 766 /* WARNING: The offset of the "number of cores" field below 767 * must match by the macro below. Update the definition if 768 * the structure layout changes. 769 */ 770 #define IBM_ARCH_VEC_NRCORES_OFFSET 100 771 W(NR_CPUS), /* number of cores supported */ 772 773 /* option vector 6: IBM PAPR hints */ 774 4 - 2, /* length */ 775 0, 776 0, 777 OV6_LINUX, 778 779 }; 780 781 /* Old method - ELF header with PT_NOTE sections */ 782 static struct fake_elf { 783 Elf32_Ehdr elfhdr; 784 Elf32_Phdr phdr[2]; 785 struct chrpnote { 786 u32 namesz; 787 u32 descsz; 788 u32 type; 789 char name[8]; /* "PowerPC" */ 790 struct chrpdesc { 791 u32 real_mode; 792 u32 real_base; 793 u32 real_size; 794 u32 virt_base; 795 u32 virt_size; 796 u32 load_base; 797 } chrpdesc; 798 } chrpnote; 799 struct rpanote { 800 u32 namesz; 801 u32 descsz; 802 u32 type; 803 char name[24]; /* "IBM,RPA-Client-Config" */ 804 struct rpadesc { 805 u32 lpar_affinity; 806 u32 min_rmo_size; 807 u32 min_rmo_percent; 808 u32 max_pft_size; 809 u32 splpar; 810 u32 min_load; 811 u32 new_mem_def; 812 u32 ignore_me; 813 } rpadesc; 814 } rpanote; 815 } fake_elf = { 816 .elfhdr = { 817 .e_ident = { 0x7f, 'E', 'L', 'F', 818 ELFCLASS32, ELFDATA2MSB, EV_CURRENT }, 819 .e_type = ET_EXEC, /* yeah right */ 820 .e_machine = EM_PPC, 821 .e_version = EV_CURRENT, 822 .e_phoff = offsetof(struct fake_elf, phdr), 823 .e_phentsize = sizeof(Elf32_Phdr), 824 .e_phnum = 2 825 }, 826 .phdr = { 827 [0] = { 828 .p_type = PT_NOTE, 829 .p_offset = offsetof(struct fake_elf, chrpnote), 830 .p_filesz = sizeof(struct chrpnote) 831 }, [1] = { 832 .p_type = PT_NOTE, 833 .p_offset = offsetof(struct fake_elf, rpanote), 834 .p_filesz = sizeof(struct rpanote) 835 } 836 }, 837 .chrpnote = { 838 .namesz = sizeof("PowerPC"), 839 .descsz = sizeof(struct chrpdesc), 840 .type = 0x1275, 841 .name = "PowerPC", 842 .chrpdesc = { 843 .real_mode = ~0U, /* ~0 means "don't care" */ 844 .real_base = ~0U, 845 .real_size = ~0U, 846 .virt_base = ~0U, 847 .virt_size = ~0U, 848 .load_base = ~0U 849 }, 850 }, 851 .rpanote = { 852 .namesz = sizeof("IBM,RPA-Client-Config"), 853 .descsz = sizeof(struct rpadesc), 854 .type = 0x12759999, 855 .name = "IBM,RPA-Client-Config", 856 .rpadesc = { 857 .lpar_affinity = 0, 858 .min_rmo_size = 64, /* in megabytes */ 859 .min_rmo_percent = 0, 860 .max_pft_size = 48, /* 2^48 bytes max PFT size */ 861 .splpar = 1, 862 .min_load = ~0U, 863 .new_mem_def = 0 864 } 865 } 866 }; 867 868 static int __init prom_count_smt_threads(void) 869 { 870 phandle node; 871 char type[64]; 872 unsigned int plen; 873 874 /* Pick up th first CPU node we can find */ 875 for (node = 0; prom_next_node(&node); ) { 876 type[0] = 0; 877 prom_getprop(node, "device_type", type, sizeof(type)); 878 879 if (strcmp(type, RELOC("cpu"))) 880 continue; 881 /* 882 * There is an entry for each smt thread, each entry being 883 * 4 bytes long. All cpus should have the same number of 884 * smt threads, so return after finding the first. 885 */ 886 plen = prom_getproplen(node, "ibm,ppc-interrupt-server#s"); 887 if (plen == PROM_ERROR) 888 break; 889 plen >>= 2; 890 prom_debug("Found %lu smt threads per core\n", (unsigned long)plen); 891 892 /* Sanity check */ 893 if (plen < 1 || plen > 64) { 894 prom_printf("Threads per core %lu out of bounds, assuming 1\n", 895 (unsigned long)plen); 896 return 1; 897 } 898 return plen; 899 } 900 prom_debug("No threads found, assuming 1 per core\n"); 901 902 return 1; 903 904 } 905 906 907 static void __init prom_send_capabilities(void) 908 { 909 ihandle elfloader, root; 910 prom_arg_t ret; 911 u32 *cores; 912 913 root = call_prom("open", 1, 1, ADDR("/")); 914 if (root != 0) { 915 /* We need to tell the FW about the number of cores we support. 916 * 917 * To do that, we count the number of threads on the first core 918 * (we assume this is the same for all cores) and use it to 919 * divide NR_CPUS. 920 */ 921 cores = (u32 *)PTRRELOC(&ibm_architecture_vec[IBM_ARCH_VEC_NRCORES_OFFSET]); 922 if (*cores != NR_CPUS) { 923 prom_printf("WARNING ! " 924 "ibm_architecture_vec structure inconsistent: %lu!\n", 925 *cores); 926 } else { 927 *cores = DIV_ROUND_UP(NR_CPUS, prom_count_smt_threads()); 928 prom_printf("Max number of cores passed to firmware: %lu (NR_CPUS = %lu)\n", 929 *cores, NR_CPUS); 930 } 931 932 /* try calling the ibm,client-architecture-support method */ 933 prom_printf("Calling ibm,client-architecture-support..."); 934 if (call_prom_ret("call-method", 3, 2, &ret, 935 ADDR("ibm,client-architecture-support"), 936 root, 937 ADDR(ibm_architecture_vec)) == 0) { 938 /* the call exists... */ 939 if (ret) 940 prom_printf("\nWARNING: ibm,client-architecture" 941 "-support call FAILED!\n"); 942 call_prom("close", 1, 0, root); 943 prom_printf(" done\n"); 944 return; 945 } 946 call_prom("close", 1, 0, root); 947 prom_printf(" not implemented\n"); 948 } 949 950 /* no ibm,client-architecture-support call, try the old way */ 951 elfloader = call_prom("open", 1, 1, ADDR("/packages/elf-loader")); 952 if (elfloader == 0) { 953 prom_printf("couldn't open /packages/elf-loader\n"); 954 return; 955 } 956 call_prom("call-method", 3, 1, ADDR("process-elf-header"), 957 elfloader, ADDR(&fake_elf)); 958 call_prom("close", 1, 0, elfloader); 959 } 960 #endif 961 962 /* 963 * Memory allocation strategy... our layout is normally: 964 * 965 * at 14Mb or more we have vmlinux, then a gap and initrd. In some 966 * rare cases, initrd might end up being before the kernel though. 967 * We assume this won't override the final kernel at 0, we have no 968 * provision to handle that in this version, but it should hopefully 969 * never happen. 970 * 971 * alloc_top is set to the top of RMO, eventually shrink down if the 972 * TCEs overlap 973 * 974 * alloc_bottom is set to the top of kernel/initrd 975 * 976 * from there, allocations are done this way : rtas is allocated 977 * topmost, and the device-tree is allocated from the bottom. We try 978 * to grow the device-tree allocation as we progress. If we can't, 979 * then we fail, we don't currently have a facility to restart 980 * elsewhere, but that shouldn't be necessary. 981 * 982 * Note that calls to reserve_mem have to be done explicitly, memory 983 * allocated with either alloc_up or alloc_down isn't automatically 984 * reserved. 985 */ 986 987 988 /* 989 * Allocates memory in the RMO upward from the kernel/initrd 990 * 991 * When align is 0, this is a special case, it means to allocate in place 992 * at the current location of alloc_bottom or fail (that is basically 993 * extending the previous allocation). Used for the device-tree flattening 994 */ 995 static unsigned long __init alloc_up(unsigned long size, unsigned long align) 996 { 997 unsigned long base = RELOC(alloc_bottom); 998 unsigned long addr = 0; 999 1000 if (align) 1001 base = _ALIGN_UP(base, align); 1002 prom_debug("alloc_up(%x, %x)\n", size, align); 1003 if (RELOC(ram_top) == 0) 1004 prom_panic("alloc_up() called with mem not initialized\n"); 1005 1006 if (align) 1007 base = _ALIGN_UP(RELOC(alloc_bottom), align); 1008 else 1009 base = RELOC(alloc_bottom); 1010 1011 for(; (base + size) <= RELOC(alloc_top); 1012 base = _ALIGN_UP(base + 0x100000, align)) { 1013 prom_debug(" trying: 0x%x\n\r", base); 1014 addr = (unsigned long)prom_claim(base, size, 0); 1015 if (addr != PROM_ERROR && addr != 0) 1016 break; 1017 addr = 0; 1018 if (align == 0) 1019 break; 1020 } 1021 if (addr == 0) 1022 return 0; 1023 RELOC(alloc_bottom) = addr; 1024 1025 prom_debug(" -> %x\n", addr); 1026 prom_debug(" alloc_bottom : %x\n", RELOC(alloc_bottom)); 1027 prom_debug(" alloc_top : %x\n", RELOC(alloc_top)); 1028 prom_debug(" alloc_top_hi : %x\n", RELOC(alloc_top_high)); 1029 prom_debug(" rmo_top : %x\n", RELOC(rmo_top)); 1030 prom_debug(" ram_top : %x\n", RELOC(ram_top)); 1031 1032 return addr; 1033 } 1034 1035 /* 1036 * Allocates memory downward, either from top of RMO, or if highmem 1037 * is set, from the top of RAM. Note that this one doesn't handle 1038 * failures. It does claim memory if highmem is not set. 1039 */ 1040 static unsigned long __init alloc_down(unsigned long size, unsigned long align, 1041 int highmem) 1042 { 1043 unsigned long base, addr = 0; 1044 1045 prom_debug("alloc_down(%x, %x, %s)\n", size, align, 1046 highmem ? RELOC("(high)") : RELOC("(low)")); 1047 if (RELOC(ram_top) == 0) 1048 prom_panic("alloc_down() called with mem not initialized\n"); 1049 1050 if (highmem) { 1051 /* Carve out storage for the TCE table. */ 1052 addr = _ALIGN_DOWN(RELOC(alloc_top_high) - size, align); 1053 if (addr <= RELOC(alloc_bottom)) 1054 return 0; 1055 /* Will we bump into the RMO ? If yes, check out that we 1056 * didn't overlap existing allocations there, if we did, 1057 * we are dead, we must be the first in town ! 1058 */ 1059 if (addr < RELOC(rmo_top)) { 1060 /* Good, we are first */ 1061 if (RELOC(alloc_top) == RELOC(rmo_top)) 1062 RELOC(alloc_top) = RELOC(rmo_top) = addr; 1063 else 1064 return 0; 1065 } 1066 RELOC(alloc_top_high) = addr; 1067 goto bail; 1068 } 1069 1070 base = _ALIGN_DOWN(RELOC(alloc_top) - size, align); 1071 for (; base > RELOC(alloc_bottom); 1072 base = _ALIGN_DOWN(base - 0x100000, align)) { 1073 prom_debug(" trying: 0x%x\n\r", base); 1074 addr = (unsigned long)prom_claim(base, size, 0); 1075 if (addr != PROM_ERROR && addr != 0) 1076 break; 1077 addr = 0; 1078 } 1079 if (addr == 0) 1080 return 0; 1081 RELOC(alloc_top) = addr; 1082 1083 bail: 1084 prom_debug(" -> %x\n", addr); 1085 prom_debug(" alloc_bottom : %x\n", RELOC(alloc_bottom)); 1086 prom_debug(" alloc_top : %x\n", RELOC(alloc_top)); 1087 prom_debug(" alloc_top_hi : %x\n", RELOC(alloc_top_high)); 1088 prom_debug(" rmo_top : %x\n", RELOC(rmo_top)); 1089 prom_debug(" ram_top : %x\n", RELOC(ram_top)); 1090 1091 return addr; 1092 } 1093 1094 /* 1095 * Parse a "reg" cell 1096 */ 1097 static unsigned long __init prom_next_cell(int s, cell_t **cellp) 1098 { 1099 cell_t *p = *cellp; 1100 unsigned long r = 0; 1101 1102 /* Ignore more than 2 cells */ 1103 while (s > sizeof(unsigned long) / 4) { 1104 p++; 1105 s--; 1106 } 1107 r = *p++; 1108 #ifdef CONFIG_PPC64 1109 if (s > 1) { 1110 r <<= 32; 1111 r |= *(p++); 1112 } 1113 #endif 1114 *cellp = p; 1115 return r; 1116 } 1117 1118 /* 1119 * Very dumb function for adding to the memory reserve list, but 1120 * we don't need anything smarter at this point 1121 * 1122 * XXX Eventually check for collisions. They should NEVER happen. 1123 * If problems seem to show up, it would be a good start to track 1124 * them down. 1125 */ 1126 static void __init reserve_mem(u64 base, u64 size) 1127 { 1128 u64 top = base + size; 1129 unsigned long cnt = RELOC(mem_reserve_cnt); 1130 1131 if (size == 0) 1132 return; 1133 1134 /* We need to always keep one empty entry so that we 1135 * have our terminator with "size" set to 0 since we are 1136 * dumb and just copy this entire array to the boot params 1137 */ 1138 base = _ALIGN_DOWN(base, PAGE_SIZE); 1139 top = _ALIGN_UP(top, PAGE_SIZE); 1140 size = top - base; 1141 1142 if (cnt >= (MEM_RESERVE_MAP_SIZE - 1)) 1143 prom_panic("Memory reserve map exhausted !\n"); 1144 RELOC(mem_reserve_map)[cnt].base = base; 1145 RELOC(mem_reserve_map)[cnt].size = size; 1146 RELOC(mem_reserve_cnt) = cnt + 1; 1147 } 1148 1149 /* 1150 * Initialize memory allocation mechanism, parse "memory" nodes and 1151 * obtain that way the top of memory and RMO to setup out local allocator 1152 */ 1153 static void __init prom_init_mem(void) 1154 { 1155 phandle node; 1156 char *path, type[64]; 1157 unsigned int plen; 1158 cell_t *p, *endp; 1159 struct prom_t *_prom = &RELOC(prom); 1160 u32 rac, rsc; 1161 1162 /* 1163 * We iterate the memory nodes to find 1164 * 1) top of RMO (first node) 1165 * 2) top of memory 1166 */ 1167 rac = 2; 1168 prom_getprop(_prom->root, "#address-cells", &rac, sizeof(rac)); 1169 rsc = 1; 1170 prom_getprop(_prom->root, "#size-cells", &rsc, sizeof(rsc)); 1171 prom_debug("root_addr_cells: %x\n", (unsigned long) rac); 1172 prom_debug("root_size_cells: %x\n", (unsigned long) rsc); 1173 1174 prom_debug("scanning memory:\n"); 1175 path = RELOC(prom_scratch); 1176 1177 for (node = 0; prom_next_node(&node); ) { 1178 type[0] = 0; 1179 prom_getprop(node, "device_type", type, sizeof(type)); 1180 1181 if (type[0] == 0) { 1182 /* 1183 * CHRP Longtrail machines have no device_type 1184 * on the memory node, so check the name instead... 1185 */ 1186 prom_getprop(node, "name", type, sizeof(type)); 1187 } 1188 if (strcmp(type, RELOC("memory"))) 1189 continue; 1190 1191 plen = prom_getprop(node, "reg", RELOC(regbuf), sizeof(regbuf)); 1192 if (plen > sizeof(regbuf)) { 1193 prom_printf("memory node too large for buffer !\n"); 1194 plen = sizeof(regbuf); 1195 } 1196 p = RELOC(regbuf); 1197 endp = p + (plen / sizeof(cell_t)); 1198 1199 #ifdef DEBUG_PROM 1200 memset(path, 0, PROM_SCRATCH_SIZE); 1201 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1); 1202 prom_debug(" node %s :\n", path); 1203 #endif /* DEBUG_PROM */ 1204 1205 while ((endp - p) >= (rac + rsc)) { 1206 unsigned long base, size; 1207 1208 base = prom_next_cell(rac, &p); 1209 size = prom_next_cell(rsc, &p); 1210 1211 if (size == 0) 1212 continue; 1213 prom_debug(" %x %x\n", base, size); 1214 if (base == 0 && (RELOC(of_platform) & PLATFORM_LPAR)) 1215 RELOC(rmo_top) = size; 1216 if ((base + size) > RELOC(ram_top)) 1217 RELOC(ram_top) = base + size; 1218 } 1219 } 1220 1221 RELOC(alloc_bottom) = PAGE_ALIGN((unsigned long)&RELOC(_end) + 0x4000); 1222 1223 /* Check if we have an initrd after the kernel, if we do move our bottom 1224 * point to after it 1225 */ 1226 if (RELOC(prom_initrd_start)) { 1227 if (RELOC(prom_initrd_end) > RELOC(alloc_bottom)) 1228 RELOC(alloc_bottom) = PAGE_ALIGN(RELOC(prom_initrd_end)); 1229 } 1230 1231 /* 1232 * If prom_memory_limit is set we reduce the upper limits *except* for 1233 * alloc_top_high. This must be the real top of RAM so we can put 1234 * TCE's up there. 1235 */ 1236 1237 RELOC(alloc_top_high) = RELOC(ram_top); 1238 1239 if (RELOC(prom_memory_limit)) { 1240 if (RELOC(prom_memory_limit) <= RELOC(alloc_bottom)) { 1241 prom_printf("Ignoring mem=%x <= alloc_bottom.\n", 1242 RELOC(prom_memory_limit)); 1243 RELOC(prom_memory_limit) = 0; 1244 } else if (RELOC(prom_memory_limit) >= RELOC(ram_top)) { 1245 prom_printf("Ignoring mem=%x >= ram_top.\n", 1246 RELOC(prom_memory_limit)); 1247 RELOC(prom_memory_limit) = 0; 1248 } else { 1249 RELOC(ram_top) = RELOC(prom_memory_limit); 1250 RELOC(rmo_top) = min(RELOC(rmo_top), RELOC(prom_memory_limit)); 1251 } 1252 } 1253 1254 /* 1255 * Setup our top alloc point, that is top of RMO or top of 1256 * segment 0 when running non-LPAR. 1257 * Some RS64 machines have buggy firmware where claims up at 1258 * 1GB fail. Cap at 768MB as a workaround. 1259 * Since 768MB is plenty of room, and we need to cap to something 1260 * reasonable on 32-bit, cap at 768MB on all machines. 1261 */ 1262 if (!RELOC(rmo_top)) 1263 RELOC(rmo_top) = RELOC(ram_top); 1264 RELOC(rmo_top) = min(0x30000000ul, RELOC(rmo_top)); 1265 RELOC(alloc_top) = RELOC(rmo_top); 1266 RELOC(alloc_top_high) = RELOC(ram_top); 1267 1268 prom_printf("memory layout at init:\n"); 1269 prom_printf(" memory_limit : %x (16 MB aligned)\n", RELOC(prom_memory_limit)); 1270 prom_printf(" alloc_bottom : %x\n", RELOC(alloc_bottom)); 1271 prom_printf(" alloc_top : %x\n", RELOC(alloc_top)); 1272 prom_printf(" alloc_top_hi : %x\n", RELOC(alloc_top_high)); 1273 prom_printf(" rmo_top : %x\n", RELOC(rmo_top)); 1274 prom_printf(" ram_top : %x\n", RELOC(ram_top)); 1275 } 1276 1277 1278 /* 1279 * Allocate room for and instantiate RTAS 1280 */ 1281 static void __init prom_instantiate_rtas(void) 1282 { 1283 phandle rtas_node; 1284 ihandle rtas_inst; 1285 u32 base, entry = 0; 1286 u32 size = 0; 1287 1288 prom_debug("prom_instantiate_rtas: start...\n"); 1289 1290 rtas_node = call_prom("finddevice", 1, 1, ADDR("/rtas")); 1291 prom_debug("rtas_node: %x\n", rtas_node); 1292 if (!PHANDLE_VALID(rtas_node)) 1293 return; 1294 1295 prom_getprop(rtas_node, "rtas-size", &size, sizeof(size)); 1296 if (size == 0) 1297 return; 1298 1299 base = alloc_down(size, PAGE_SIZE, 0); 1300 if (base == 0) { 1301 prom_printf("RTAS allocation failed !\n"); 1302 return; 1303 } 1304 1305 rtas_inst = call_prom("open", 1, 1, ADDR("/rtas")); 1306 if (!IHANDLE_VALID(rtas_inst)) { 1307 prom_printf("opening rtas package failed (%x)\n", rtas_inst); 1308 return; 1309 } 1310 1311 prom_printf("instantiating rtas at 0x%x...", base); 1312 1313 if (call_prom_ret("call-method", 3, 2, &entry, 1314 ADDR("instantiate-rtas"), 1315 rtas_inst, base) != 0 1316 || entry == 0) { 1317 prom_printf(" failed\n"); 1318 return; 1319 } 1320 prom_printf(" done\n"); 1321 1322 reserve_mem(base, size); 1323 1324 prom_setprop(rtas_node, "/rtas", "linux,rtas-base", 1325 &base, sizeof(base)); 1326 prom_setprop(rtas_node, "/rtas", "linux,rtas-entry", 1327 &entry, sizeof(entry)); 1328 1329 prom_debug("rtas base = 0x%x\n", base); 1330 prom_debug("rtas entry = 0x%x\n", entry); 1331 prom_debug("rtas size = 0x%x\n", (long)size); 1332 1333 prom_debug("prom_instantiate_rtas: end...\n"); 1334 } 1335 1336 #ifdef CONFIG_PPC64 1337 /* 1338 * Allocate room for and initialize TCE tables 1339 */ 1340 static void __init prom_initialize_tce_table(void) 1341 { 1342 phandle node; 1343 ihandle phb_node; 1344 char compatible[64], type[64], model[64]; 1345 char *path = RELOC(prom_scratch); 1346 u64 base, align; 1347 u32 minalign, minsize; 1348 u64 tce_entry, *tce_entryp; 1349 u64 local_alloc_top, local_alloc_bottom; 1350 u64 i; 1351 1352 if (RELOC(prom_iommu_off)) 1353 return; 1354 1355 prom_debug("starting prom_initialize_tce_table\n"); 1356 1357 /* Cache current top of allocs so we reserve a single block */ 1358 local_alloc_top = RELOC(alloc_top_high); 1359 local_alloc_bottom = local_alloc_top; 1360 1361 /* Search all nodes looking for PHBs. */ 1362 for (node = 0; prom_next_node(&node); ) { 1363 compatible[0] = 0; 1364 type[0] = 0; 1365 model[0] = 0; 1366 prom_getprop(node, "compatible", 1367 compatible, sizeof(compatible)); 1368 prom_getprop(node, "device_type", type, sizeof(type)); 1369 prom_getprop(node, "model", model, sizeof(model)); 1370 1371 if ((type[0] == 0) || (strstr(type, RELOC("pci")) == NULL)) 1372 continue; 1373 1374 /* Keep the old logic intact to avoid regression. */ 1375 if (compatible[0] != 0) { 1376 if ((strstr(compatible, RELOC("python")) == NULL) && 1377 (strstr(compatible, RELOC("Speedwagon")) == NULL) && 1378 (strstr(compatible, RELOC("Winnipeg")) == NULL)) 1379 continue; 1380 } else if (model[0] != 0) { 1381 if ((strstr(model, RELOC("ython")) == NULL) && 1382 (strstr(model, RELOC("peedwagon")) == NULL) && 1383 (strstr(model, RELOC("innipeg")) == NULL)) 1384 continue; 1385 } 1386 1387 if (prom_getprop(node, "tce-table-minalign", &minalign, 1388 sizeof(minalign)) == PROM_ERROR) 1389 minalign = 0; 1390 if (prom_getprop(node, "tce-table-minsize", &minsize, 1391 sizeof(minsize)) == PROM_ERROR) 1392 minsize = 4UL << 20; 1393 1394 /* 1395 * Even though we read what OF wants, we just set the table 1396 * size to 4 MB. This is enough to map 2GB of PCI DMA space. 1397 * By doing this, we avoid the pitfalls of trying to DMA to 1398 * MMIO space and the DMA alias hole. 1399 * 1400 * On POWER4, firmware sets the TCE region by assuming 1401 * each TCE table is 8MB. Using this memory for anything 1402 * else will impact performance, so we always allocate 8MB. 1403 * Anton 1404 */ 1405 if (__is_processor(PV_POWER4) || __is_processor(PV_POWER4p)) 1406 minsize = 8UL << 20; 1407 else 1408 minsize = 4UL << 20; 1409 1410 /* Align to the greater of the align or size */ 1411 align = max(minalign, minsize); 1412 base = alloc_down(minsize, align, 1); 1413 if (base == 0) 1414 prom_panic("ERROR, cannot find space for TCE table.\n"); 1415 if (base < local_alloc_bottom) 1416 local_alloc_bottom = base; 1417 1418 /* It seems OF doesn't null-terminate the path :-( */ 1419 memset(path, 0, PROM_SCRATCH_SIZE); 1420 /* Call OF to setup the TCE hardware */ 1421 if (call_prom("package-to-path", 3, 1, node, 1422 path, PROM_SCRATCH_SIZE-1) == PROM_ERROR) { 1423 prom_printf("package-to-path failed\n"); 1424 } 1425 1426 /* Save away the TCE table attributes for later use. */ 1427 prom_setprop(node, path, "linux,tce-base", &base, sizeof(base)); 1428 prom_setprop(node, path, "linux,tce-size", &minsize, sizeof(minsize)); 1429 1430 prom_debug("TCE table: %s\n", path); 1431 prom_debug("\tnode = 0x%x\n", node); 1432 prom_debug("\tbase = 0x%x\n", base); 1433 prom_debug("\tsize = 0x%x\n", minsize); 1434 1435 /* Initialize the table to have a one-to-one mapping 1436 * over the allocated size. 1437 */ 1438 tce_entryp = (u64 *)base; 1439 for (i = 0; i < (minsize >> 3) ;tce_entryp++, i++) { 1440 tce_entry = (i << PAGE_SHIFT); 1441 tce_entry |= 0x3; 1442 *tce_entryp = tce_entry; 1443 } 1444 1445 prom_printf("opening PHB %s", path); 1446 phb_node = call_prom("open", 1, 1, path); 1447 if (phb_node == 0) 1448 prom_printf("... failed\n"); 1449 else 1450 prom_printf("... done\n"); 1451 1452 call_prom("call-method", 6, 0, ADDR("set-64-bit-addressing"), 1453 phb_node, -1, minsize, 1454 (u32) base, (u32) (base >> 32)); 1455 call_prom("close", 1, 0, phb_node); 1456 } 1457 1458 reserve_mem(local_alloc_bottom, local_alloc_top - local_alloc_bottom); 1459 1460 /* These are only really needed if there is a memory limit in 1461 * effect, but we don't know so export them always. */ 1462 RELOC(prom_tce_alloc_start) = local_alloc_bottom; 1463 RELOC(prom_tce_alloc_end) = local_alloc_top; 1464 1465 /* Flag the first invalid entry */ 1466 prom_debug("ending prom_initialize_tce_table\n"); 1467 } 1468 #endif 1469 1470 /* 1471 * With CHRP SMP we need to use the OF to start the other processors. 1472 * We can't wait until smp_boot_cpus (the OF is trashed by then) 1473 * so we have to put the processors into a holding pattern controlled 1474 * by the kernel (not OF) before we destroy the OF. 1475 * 1476 * This uses a chunk of low memory, puts some holding pattern 1477 * code there and sends the other processors off to there until 1478 * smp_boot_cpus tells them to do something. The holding pattern 1479 * checks that address until its cpu # is there, when it is that 1480 * cpu jumps to __secondary_start(). smp_boot_cpus() takes care 1481 * of setting those values. 1482 * 1483 * We also use physical address 0x4 here to tell when a cpu 1484 * is in its holding pattern code. 1485 * 1486 * -- Cort 1487 */ 1488 /* 1489 * We want to reference the copy of __secondary_hold_* in the 1490 * 0 - 0x100 address range 1491 */ 1492 #define LOW_ADDR(x) (((unsigned long) &(x)) & 0xff) 1493 1494 static void __init prom_hold_cpus(void) 1495 { 1496 unsigned long i; 1497 unsigned int reg; 1498 phandle node; 1499 char type[64]; 1500 struct prom_t *_prom = &RELOC(prom); 1501 unsigned long *spinloop 1502 = (void *) LOW_ADDR(__secondary_hold_spinloop); 1503 unsigned long *acknowledge 1504 = (void *) LOW_ADDR(__secondary_hold_acknowledge); 1505 unsigned long secondary_hold = LOW_ADDR(__secondary_hold); 1506 1507 prom_debug("prom_hold_cpus: start...\n"); 1508 prom_debug(" 1) spinloop = 0x%x\n", (unsigned long)spinloop); 1509 prom_debug(" 1) *spinloop = 0x%x\n", *spinloop); 1510 prom_debug(" 1) acknowledge = 0x%x\n", 1511 (unsigned long)acknowledge); 1512 prom_debug(" 1) *acknowledge = 0x%x\n", *acknowledge); 1513 prom_debug(" 1) secondary_hold = 0x%x\n", secondary_hold); 1514 1515 /* Set the common spinloop variable, so all of the secondary cpus 1516 * will block when they are awakened from their OF spinloop. 1517 * This must occur for both SMP and non SMP kernels, since OF will 1518 * be trashed when we move the kernel. 1519 */ 1520 *spinloop = 0; 1521 1522 /* look for cpus */ 1523 for (node = 0; prom_next_node(&node); ) { 1524 type[0] = 0; 1525 prom_getprop(node, "device_type", type, sizeof(type)); 1526 if (strcmp(type, RELOC("cpu")) != 0) 1527 continue; 1528 1529 /* Skip non-configured cpus. */ 1530 if (prom_getprop(node, "status", type, sizeof(type)) > 0) 1531 if (strcmp(type, RELOC("okay")) != 0) 1532 continue; 1533 1534 reg = -1; 1535 prom_getprop(node, "reg", ®, sizeof(reg)); 1536 1537 prom_debug("cpu hw idx = %lu\n", reg); 1538 1539 /* Init the acknowledge var which will be reset by 1540 * the secondary cpu when it awakens from its OF 1541 * spinloop. 1542 */ 1543 *acknowledge = (unsigned long)-1; 1544 1545 if (reg != _prom->cpu) { 1546 /* Primary Thread of non-boot cpu */ 1547 prom_printf("starting cpu hw idx %lu... ", reg); 1548 call_prom("start-cpu", 3, 0, node, 1549 secondary_hold, reg); 1550 1551 for (i = 0; (i < 100000000) && 1552 (*acknowledge == ((unsigned long)-1)); i++ ) 1553 mb(); 1554 1555 if (*acknowledge == reg) 1556 prom_printf("done\n"); 1557 else 1558 prom_printf("failed: %x\n", *acknowledge); 1559 } 1560 #ifdef CONFIG_SMP 1561 else 1562 prom_printf("boot cpu hw idx %lu\n", reg); 1563 #endif /* CONFIG_SMP */ 1564 } 1565 1566 prom_debug("prom_hold_cpus: end...\n"); 1567 } 1568 1569 1570 static void __init prom_init_client_services(unsigned long pp) 1571 { 1572 struct prom_t *_prom = &RELOC(prom); 1573 1574 /* Get a handle to the prom entry point before anything else */ 1575 RELOC(prom_entry) = pp; 1576 1577 /* get a handle for the stdout device */ 1578 _prom->chosen = call_prom("finddevice", 1, 1, ADDR("/chosen")); 1579 if (!PHANDLE_VALID(_prom->chosen)) 1580 prom_panic("cannot find chosen"); /* msg won't be printed :( */ 1581 1582 /* get device tree root */ 1583 _prom->root = call_prom("finddevice", 1, 1, ADDR("/")); 1584 if (!PHANDLE_VALID(_prom->root)) 1585 prom_panic("cannot find device tree root"); /* msg won't be printed :( */ 1586 1587 _prom->mmumap = 0; 1588 } 1589 1590 #ifdef CONFIG_PPC32 1591 /* 1592 * For really old powermacs, we need to map things we claim. 1593 * For that, we need the ihandle of the mmu. 1594 * Also, on the longtrail, we need to work around other bugs. 1595 */ 1596 static void __init prom_find_mmu(void) 1597 { 1598 struct prom_t *_prom = &RELOC(prom); 1599 phandle oprom; 1600 char version[64]; 1601 1602 oprom = call_prom("finddevice", 1, 1, ADDR("/openprom")); 1603 if (!PHANDLE_VALID(oprom)) 1604 return; 1605 if (prom_getprop(oprom, "model", version, sizeof(version)) <= 0) 1606 return; 1607 version[sizeof(version) - 1] = 0; 1608 /* XXX might need to add other versions here */ 1609 if (strcmp(version, "Open Firmware, 1.0.5") == 0) 1610 of_workarounds = OF_WA_CLAIM; 1611 else if (strncmp(version, "FirmWorks,3.", 12) == 0) { 1612 of_workarounds = OF_WA_CLAIM | OF_WA_LONGTRAIL; 1613 call_prom("interpret", 1, 1, "dev /memory 0 to allow-reclaim"); 1614 } else 1615 return; 1616 _prom->memory = call_prom("open", 1, 1, ADDR("/memory")); 1617 prom_getprop(_prom->chosen, "mmu", &_prom->mmumap, 1618 sizeof(_prom->mmumap)); 1619 if (!IHANDLE_VALID(_prom->memory) || !IHANDLE_VALID(_prom->mmumap)) 1620 of_workarounds &= ~OF_WA_CLAIM; /* hmmm */ 1621 } 1622 #else 1623 #define prom_find_mmu() 1624 #endif 1625 1626 static void __init prom_init_stdout(void) 1627 { 1628 struct prom_t *_prom = &RELOC(prom); 1629 char *path = RELOC(of_stdout_device); 1630 char type[16]; 1631 u32 val; 1632 1633 if (prom_getprop(_prom->chosen, "stdout", &val, sizeof(val)) <= 0) 1634 prom_panic("cannot find stdout"); 1635 1636 _prom->stdout = val; 1637 1638 /* Get the full OF pathname of the stdout device */ 1639 memset(path, 0, 256); 1640 call_prom("instance-to-path", 3, 1, _prom->stdout, path, 255); 1641 val = call_prom("instance-to-package", 1, 1, _prom->stdout); 1642 prom_setprop(_prom->chosen, "/chosen", "linux,stdout-package", 1643 &val, sizeof(val)); 1644 prom_printf("OF stdout device is: %s\n", RELOC(of_stdout_device)); 1645 prom_setprop(_prom->chosen, "/chosen", "linux,stdout-path", 1646 path, strlen(path) + 1); 1647 1648 /* If it's a display, note it */ 1649 memset(type, 0, sizeof(type)); 1650 prom_getprop(val, "device_type", type, sizeof(type)); 1651 if (strcmp(type, RELOC("display")) == 0) 1652 prom_setprop(val, path, "linux,boot-display", NULL, 0); 1653 } 1654 1655 static void __init prom_close_stdin(void) 1656 { 1657 struct prom_t *_prom = &RELOC(prom); 1658 ihandle val; 1659 1660 if (prom_getprop(_prom->chosen, "stdin", &val, sizeof(val)) > 0) 1661 call_prom("close", 1, 0, val); 1662 } 1663 1664 static int __init prom_find_machine_type(void) 1665 { 1666 struct prom_t *_prom = &RELOC(prom); 1667 char compat[256]; 1668 int len, i = 0; 1669 #ifdef CONFIG_PPC64 1670 phandle rtas; 1671 int x; 1672 #endif 1673 1674 /* Look for a PowerMac */ 1675 len = prom_getprop(_prom->root, "compatible", 1676 compat, sizeof(compat)-1); 1677 if (len > 0) { 1678 compat[len] = 0; 1679 while (i < len) { 1680 char *p = &compat[i]; 1681 int sl = strlen(p); 1682 if (sl == 0) 1683 break; 1684 if (strstr(p, RELOC("Power Macintosh")) || 1685 strstr(p, RELOC("MacRISC"))) 1686 return PLATFORM_POWERMAC; 1687 #ifdef CONFIG_PPC64 1688 /* We must make sure we don't detect the IBM Cell 1689 * blades as pSeries due to some firmware issues, 1690 * so we do it here. 1691 */ 1692 if (strstr(p, RELOC("IBM,CBEA")) || 1693 strstr(p, RELOC("IBM,CPBW-1.0"))) 1694 return PLATFORM_GENERIC; 1695 #endif /* CONFIG_PPC64 */ 1696 i += sl + 1; 1697 } 1698 } 1699 #ifdef CONFIG_PPC64 1700 /* If not a mac, try to figure out if it's an IBM pSeries or any other 1701 * PAPR compliant platform. We assume it is if : 1702 * - /device_type is "chrp" (please, do NOT use that for future 1703 * non-IBM designs ! 1704 * - it has /rtas 1705 */ 1706 len = prom_getprop(_prom->root, "device_type", 1707 compat, sizeof(compat)-1); 1708 if (len <= 0) 1709 return PLATFORM_GENERIC; 1710 if (strcmp(compat, RELOC("chrp"))) 1711 return PLATFORM_GENERIC; 1712 1713 /* Default to pSeries. We need to know if we are running LPAR */ 1714 rtas = call_prom("finddevice", 1, 1, ADDR("/rtas")); 1715 if (!PHANDLE_VALID(rtas)) 1716 return PLATFORM_GENERIC; 1717 x = prom_getproplen(rtas, "ibm,hypertas-functions"); 1718 if (x != PROM_ERROR) { 1719 prom_debug("Hypertas detected, assuming LPAR !\n"); 1720 return PLATFORM_PSERIES_LPAR; 1721 } 1722 return PLATFORM_PSERIES; 1723 #else 1724 return PLATFORM_GENERIC; 1725 #endif 1726 } 1727 1728 static int __init prom_set_color(ihandle ih, int i, int r, int g, int b) 1729 { 1730 return call_prom("call-method", 6, 1, ADDR("color!"), ih, i, b, g, r); 1731 } 1732 1733 /* 1734 * If we have a display that we don't know how to drive, 1735 * we will want to try to execute OF's open method for it 1736 * later. However, OF will probably fall over if we do that 1737 * we've taken over the MMU. 1738 * So we check whether we will need to open the display, 1739 * and if so, open it now. 1740 */ 1741 static void __init prom_check_displays(void) 1742 { 1743 char type[16], *path; 1744 phandle node; 1745 ihandle ih; 1746 int i; 1747 1748 static unsigned char default_colors[] = { 1749 0x00, 0x00, 0x00, 1750 0x00, 0x00, 0xaa, 1751 0x00, 0xaa, 0x00, 1752 0x00, 0xaa, 0xaa, 1753 0xaa, 0x00, 0x00, 1754 0xaa, 0x00, 0xaa, 1755 0xaa, 0xaa, 0x00, 1756 0xaa, 0xaa, 0xaa, 1757 0x55, 0x55, 0x55, 1758 0x55, 0x55, 0xff, 1759 0x55, 0xff, 0x55, 1760 0x55, 0xff, 0xff, 1761 0xff, 0x55, 0x55, 1762 0xff, 0x55, 0xff, 1763 0xff, 0xff, 0x55, 1764 0xff, 0xff, 0xff 1765 }; 1766 const unsigned char *clut; 1767 1768 prom_debug("Looking for displays\n"); 1769 for (node = 0; prom_next_node(&node); ) { 1770 memset(type, 0, sizeof(type)); 1771 prom_getprop(node, "device_type", type, sizeof(type)); 1772 if (strcmp(type, RELOC("display")) != 0) 1773 continue; 1774 1775 /* It seems OF doesn't null-terminate the path :-( */ 1776 path = RELOC(prom_scratch); 1777 memset(path, 0, PROM_SCRATCH_SIZE); 1778 1779 /* 1780 * leave some room at the end of the path for appending extra 1781 * arguments 1782 */ 1783 if (call_prom("package-to-path", 3, 1, node, path, 1784 PROM_SCRATCH_SIZE-10) == PROM_ERROR) 1785 continue; 1786 prom_printf("found display : %s, opening... ", path); 1787 1788 ih = call_prom("open", 1, 1, path); 1789 if (ih == 0) { 1790 prom_printf("failed\n"); 1791 continue; 1792 } 1793 1794 /* Success */ 1795 prom_printf("done\n"); 1796 prom_setprop(node, path, "linux,opened", NULL, 0); 1797 1798 /* Setup a usable color table when the appropriate 1799 * method is available. Should update this to set-colors */ 1800 clut = RELOC(default_colors); 1801 for (i = 0; i < 32; i++, clut += 3) 1802 if (prom_set_color(ih, i, clut[0], clut[1], 1803 clut[2]) != 0) 1804 break; 1805 1806 #ifdef CONFIG_LOGO_LINUX_CLUT224 1807 clut = PTRRELOC(RELOC(logo_linux_clut224.clut)); 1808 for (i = 0; i < RELOC(logo_linux_clut224.clutsize); i++, clut += 3) 1809 if (prom_set_color(ih, i + 32, clut[0], clut[1], 1810 clut[2]) != 0) 1811 break; 1812 #endif /* CONFIG_LOGO_LINUX_CLUT224 */ 1813 } 1814 } 1815 1816 1817 /* Return (relocated) pointer to this much memory: moves initrd if reqd. */ 1818 static void __init *make_room(unsigned long *mem_start, unsigned long *mem_end, 1819 unsigned long needed, unsigned long align) 1820 { 1821 void *ret; 1822 1823 *mem_start = _ALIGN(*mem_start, align); 1824 while ((*mem_start + needed) > *mem_end) { 1825 unsigned long room, chunk; 1826 1827 prom_debug("Chunk exhausted, claiming more at %x...\n", 1828 RELOC(alloc_bottom)); 1829 room = RELOC(alloc_top) - RELOC(alloc_bottom); 1830 if (room > DEVTREE_CHUNK_SIZE) 1831 room = DEVTREE_CHUNK_SIZE; 1832 if (room < PAGE_SIZE) 1833 prom_panic("No memory for flatten_device_tree (no room)"); 1834 chunk = alloc_up(room, 0); 1835 if (chunk == 0) 1836 prom_panic("No memory for flatten_device_tree (claim failed)"); 1837 *mem_end = RELOC(alloc_top); 1838 } 1839 1840 ret = (void *)*mem_start; 1841 *mem_start += needed; 1842 1843 return ret; 1844 } 1845 1846 #define dt_push_token(token, mem_start, mem_end) \ 1847 do { *((u32 *)make_room(mem_start, mem_end, 4, 4)) = token; } while(0) 1848 1849 static unsigned long __init dt_find_string(char *str) 1850 { 1851 char *s, *os; 1852 1853 s = os = (char *)RELOC(dt_string_start); 1854 s += 4; 1855 while (s < (char *)RELOC(dt_string_end)) { 1856 if (strcmp(s, str) == 0) 1857 return s - os; 1858 s += strlen(s) + 1; 1859 } 1860 return 0; 1861 } 1862 1863 /* 1864 * The Open Firmware 1275 specification states properties must be 31 bytes or 1865 * less, however not all firmwares obey this. Make it 64 bytes to be safe. 1866 */ 1867 #define MAX_PROPERTY_NAME 64 1868 1869 static void __init scan_dt_build_strings(phandle node, 1870 unsigned long *mem_start, 1871 unsigned long *mem_end) 1872 { 1873 char *prev_name, *namep, *sstart; 1874 unsigned long soff; 1875 phandle child; 1876 1877 sstart = (char *)RELOC(dt_string_start); 1878 1879 /* get and store all property names */ 1880 prev_name = RELOC(""); 1881 for (;;) { 1882 /* 64 is max len of name including nul. */ 1883 namep = make_room(mem_start, mem_end, MAX_PROPERTY_NAME, 1); 1884 if (call_prom("nextprop", 3, 1, node, prev_name, namep) != 1) { 1885 /* No more nodes: unwind alloc */ 1886 *mem_start = (unsigned long)namep; 1887 break; 1888 } 1889 1890 /* skip "name" */ 1891 if (strcmp(namep, RELOC("name")) == 0) { 1892 *mem_start = (unsigned long)namep; 1893 prev_name = RELOC("name"); 1894 continue; 1895 } 1896 /* get/create string entry */ 1897 soff = dt_find_string(namep); 1898 if (soff != 0) { 1899 *mem_start = (unsigned long)namep; 1900 namep = sstart + soff; 1901 } else { 1902 /* Trim off some if we can */ 1903 *mem_start = (unsigned long)namep + strlen(namep) + 1; 1904 RELOC(dt_string_end) = *mem_start; 1905 } 1906 prev_name = namep; 1907 } 1908 1909 /* do all our children */ 1910 child = call_prom("child", 1, 1, node); 1911 while (child != 0) { 1912 scan_dt_build_strings(child, mem_start, mem_end); 1913 child = call_prom("peer", 1, 1, child); 1914 } 1915 } 1916 1917 static void __init scan_dt_build_struct(phandle node, unsigned long *mem_start, 1918 unsigned long *mem_end) 1919 { 1920 phandle child; 1921 char *namep, *prev_name, *sstart, *p, *ep, *lp, *path; 1922 unsigned long soff; 1923 unsigned char *valp; 1924 static char pname[MAX_PROPERTY_NAME]; 1925 int l, room; 1926 1927 dt_push_token(OF_DT_BEGIN_NODE, mem_start, mem_end); 1928 1929 /* get the node's full name */ 1930 namep = (char *)*mem_start; 1931 room = *mem_end - *mem_start; 1932 if (room > 255) 1933 room = 255; 1934 l = call_prom("package-to-path", 3, 1, node, namep, room); 1935 if (l >= 0) { 1936 /* Didn't fit? Get more room. */ 1937 if (l >= room) { 1938 if (l >= *mem_end - *mem_start) 1939 namep = make_room(mem_start, mem_end, l+1, 1); 1940 call_prom("package-to-path", 3, 1, node, namep, l); 1941 } 1942 namep[l] = '\0'; 1943 1944 /* Fixup an Apple bug where they have bogus \0 chars in the 1945 * middle of the path in some properties, and extract 1946 * the unit name (everything after the last '/'). 1947 */ 1948 for (lp = p = namep, ep = namep + l; p < ep; p++) { 1949 if (*p == '/') 1950 lp = namep; 1951 else if (*p != 0) 1952 *lp++ = *p; 1953 } 1954 *lp = 0; 1955 *mem_start = _ALIGN((unsigned long)lp + 1, 4); 1956 } 1957 1958 /* get it again for debugging */ 1959 path = RELOC(prom_scratch); 1960 memset(path, 0, PROM_SCRATCH_SIZE); 1961 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1); 1962 1963 /* get and store all properties */ 1964 prev_name = RELOC(""); 1965 sstart = (char *)RELOC(dt_string_start); 1966 for (;;) { 1967 if (call_prom("nextprop", 3, 1, node, prev_name, 1968 RELOC(pname)) != 1) 1969 break; 1970 1971 /* skip "name" */ 1972 if (strcmp(RELOC(pname), RELOC("name")) == 0) { 1973 prev_name = RELOC("name"); 1974 continue; 1975 } 1976 1977 /* find string offset */ 1978 soff = dt_find_string(RELOC(pname)); 1979 if (soff == 0) { 1980 prom_printf("WARNING: Can't find string index for" 1981 " <%s>, node %s\n", RELOC(pname), path); 1982 break; 1983 } 1984 prev_name = sstart + soff; 1985 1986 /* get length */ 1987 l = call_prom("getproplen", 2, 1, node, RELOC(pname)); 1988 1989 /* sanity checks */ 1990 if (l == PROM_ERROR) 1991 continue; 1992 if (l > MAX_PROPERTY_LENGTH) { 1993 prom_printf("WARNING: ignoring large property "); 1994 /* It seems OF doesn't null-terminate the path :-( */ 1995 prom_printf("[%s] ", path); 1996 prom_printf("%s length 0x%x\n", RELOC(pname), l); 1997 continue; 1998 } 1999 2000 /* push property head */ 2001 dt_push_token(OF_DT_PROP, mem_start, mem_end); 2002 dt_push_token(l, mem_start, mem_end); 2003 dt_push_token(soff, mem_start, mem_end); 2004 2005 /* push property content */ 2006 valp = make_room(mem_start, mem_end, l, 4); 2007 call_prom("getprop", 4, 1, node, RELOC(pname), valp, l); 2008 *mem_start = _ALIGN(*mem_start, 4); 2009 } 2010 2011 /* Add a "linux,phandle" property. */ 2012 soff = dt_find_string(RELOC("linux,phandle")); 2013 if (soff == 0) 2014 prom_printf("WARNING: Can't find string index for" 2015 " <linux-phandle> node %s\n", path); 2016 else { 2017 dt_push_token(OF_DT_PROP, mem_start, mem_end); 2018 dt_push_token(4, mem_start, mem_end); 2019 dt_push_token(soff, mem_start, mem_end); 2020 valp = make_room(mem_start, mem_end, 4, 4); 2021 *(u32 *)valp = node; 2022 } 2023 2024 /* do all our children */ 2025 child = call_prom("child", 1, 1, node); 2026 while (child != 0) { 2027 scan_dt_build_struct(child, mem_start, mem_end); 2028 child = call_prom("peer", 1, 1, child); 2029 } 2030 2031 dt_push_token(OF_DT_END_NODE, mem_start, mem_end); 2032 } 2033 2034 static void __init flatten_device_tree(void) 2035 { 2036 phandle root; 2037 unsigned long mem_start, mem_end, room; 2038 struct boot_param_header *hdr; 2039 struct prom_t *_prom = &RELOC(prom); 2040 char *namep; 2041 u64 *rsvmap; 2042 2043 /* 2044 * Check how much room we have between alloc top & bottom (+/- a 2045 * few pages), crop to 4Mb, as this is our "chuck" size 2046 */ 2047 room = RELOC(alloc_top) - RELOC(alloc_bottom) - 0x4000; 2048 if (room > DEVTREE_CHUNK_SIZE) 2049 room = DEVTREE_CHUNK_SIZE; 2050 prom_debug("starting device tree allocs at %x\n", RELOC(alloc_bottom)); 2051 2052 /* Now try to claim that */ 2053 mem_start = (unsigned long)alloc_up(room, PAGE_SIZE); 2054 if (mem_start == 0) 2055 prom_panic("Can't allocate initial device-tree chunk\n"); 2056 mem_end = RELOC(alloc_top); 2057 2058 /* Get root of tree */ 2059 root = call_prom("peer", 1, 1, (phandle)0); 2060 if (root == (phandle)0) 2061 prom_panic ("couldn't get device tree root\n"); 2062 2063 /* Build header and make room for mem rsv map */ 2064 mem_start = _ALIGN(mem_start, 4); 2065 hdr = make_room(&mem_start, &mem_end, 2066 sizeof(struct boot_param_header), 4); 2067 RELOC(dt_header_start) = (unsigned long)hdr; 2068 rsvmap = make_room(&mem_start, &mem_end, sizeof(mem_reserve_map), 8); 2069 2070 /* Start of strings */ 2071 mem_start = PAGE_ALIGN(mem_start); 2072 RELOC(dt_string_start) = mem_start; 2073 mem_start += 4; /* hole */ 2074 2075 /* Add "linux,phandle" in there, we'll need it */ 2076 namep = make_room(&mem_start, &mem_end, 16, 1); 2077 strcpy(namep, RELOC("linux,phandle")); 2078 mem_start = (unsigned long)namep + strlen(namep) + 1; 2079 2080 /* Build string array */ 2081 prom_printf("Building dt strings...\n"); 2082 scan_dt_build_strings(root, &mem_start, &mem_end); 2083 RELOC(dt_string_end) = mem_start; 2084 2085 /* Build structure */ 2086 mem_start = PAGE_ALIGN(mem_start); 2087 RELOC(dt_struct_start) = mem_start; 2088 prom_printf("Building dt structure...\n"); 2089 scan_dt_build_struct(root, &mem_start, &mem_end); 2090 dt_push_token(OF_DT_END, &mem_start, &mem_end); 2091 RELOC(dt_struct_end) = PAGE_ALIGN(mem_start); 2092 2093 /* Finish header */ 2094 hdr->boot_cpuid_phys = _prom->cpu; 2095 hdr->magic = OF_DT_HEADER; 2096 hdr->totalsize = RELOC(dt_struct_end) - RELOC(dt_header_start); 2097 hdr->off_dt_struct = RELOC(dt_struct_start) - RELOC(dt_header_start); 2098 hdr->off_dt_strings = RELOC(dt_string_start) - RELOC(dt_header_start); 2099 hdr->dt_strings_size = RELOC(dt_string_end) - RELOC(dt_string_start); 2100 hdr->off_mem_rsvmap = ((unsigned long)rsvmap) - RELOC(dt_header_start); 2101 hdr->version = OF_DT_VERSION; 2102 /* Version 16 is not backward compatible */ 2103 hdr->last_comp_version = 0x10; 2104 2105 /* Copy the reserve map in */ 2106 memcpy(rsvmap, RELOC(mem_reserve_map), sizeof(mem_reserve_map)); 2107 2108 #ifdef DEBUG_PROM 2109 { 2110 int i; 2111 prom_printf("reserved memory map:\n"); 2112 for (i = 0; i < RELOC(mem_reserve_cnt); i++) 2113 prom_printf(" %x - %x\n", 2114 RELOC(mem_reserve_map)[i].base, 2115 RELOC(mem_reserve_map)[i].size); 2116 } 2117 #endif 2118 /* Bump mem_reserve_cnt to cause further reservations to fail 2119 * since it's too late. 2120 */ 2121 RELOC(mem_reserve_cnt) = MEM_RESERVE_MAP_SIZE; 2122 2123 prom_printf("Device tree strings 0x%x -> 0x%x\n", 2124 RELOC(dt_string_start), RELOC(dt_string_end)); 2125 prom_printf("Device tree struct 0x%x -> 0x%x\n", 2126 RELOC(dt_struct_start), RELOC(dt_struct_end)); 2127 2128 } 2129 2130 #ifdef CONFIG_PPC_MAPLE 2131 /* PIBS Version 1.05.0000 04/26/2005 has an incorrect /ht/isa/ranges property. 2132 * The values are bad, and it doesn't even have the right number of cells. */ 2133 static void __init fixup_device_tree_maple(void) 2134 { 2135 phandle isa; 2136 u32 rloc = 0x01002000; /* IO space; PCI device = 4 */ 2137 u32 isa_ranges[6]; 2138 char *name; 2139 2140 name = "/ht@0/isa@4"; 2141 isa = call_prom("finddevice", 1, 1, ADDR(name)); 2142 if (!PHANDLE_VALID(isa)) { 2143 name = "/ht@0/isa@6"; 2144 isa = call_prom("finddevice", 1, 1, ADDR(name)); 2145 rloc = 0x01003000; /* IO space; PCI device = 6 */ 2146 } 2147 if (!PHANDLE_VALID(isa)) 2148 return; 2149 2150 if (prom_getproplen(isa, "ranges") != 12) 2151 return; 2152 if (prom_getprop(isa, "ranges", isa_ranges, sizeof(isa_ranges)) 2153 == PROM_ERROR) 2154 return; 2155 2156 if (isa_ranges[0] != 0x1 || 2157 isa_ranges[1] != 0xf4000000 || 2158 isa_ranges[2] != 0x00010000) 2159 return; 2160 2161 prom_printf("Fixing up bogus ISA range on Maple/Apache...\n"); 2162 2163 isa_ranges[0] = 0x1; 2164 isa_ranges[1] = 0x0; 2165 isa_ranges[2] = rloc; 2166 isa_ranges[3] = 0x0; 2167 isa_ranges[4] = 0x0; 2168 isa_ranges[5] = 0x00010000; 2169 prom_setprop(isa, name, "ranges", 2170 isa_ranges, sizeof(isa_ranges)); 2171 } 2172 2173 #define CPC925_MC_START 0xf8000000 2174 #define CPC925_MC_LENGTH 0x1000000 2175 /* The values for memory-controller don't have right number of cells */ 2176 static void __init fixup_device_tree_maple_memory_controller(void) 2177 { 2178 phandle mc; 2179 u32 mc_reg[4]; 2180 char *name = "/hostbridge@f8000000"; 2181 struct prom_t *_prom = &RELOC(prom); 2182 u32 ac, sc; 2183 2184 mc = call_prom("finddevice", 1, 1, ADDR(name)); 2185 if (!PHANDLE_VALID(mc)) 2186 return; 2187 2188 if (prom_getproplen(mc, "reg") != 8) 2189 return; 2190 2191 prom_getprop(_prom->root, "#address-cells", &ac, sizeof(ac)); 2192 prom_getprop(_prom->root, "#size-cells", &sc, sizeof(sc)); 2193 if ((ac != 2) || (sc != 2)) 2194 return; 2195 2196 if (prom_getprop(mc, "reg", mc_reg, sizeof(mc_reg)) == PROM_ERROR) 2197 return; 2198 2199 if (mc_reg[0] != CPC925_MC_START || mc_reg[1] != CPC925_MC_LENGTH) 2200 return; 2201 2202 prom_printf("Fixing up bogus hostbridge on Maple...\n"); 2203 2204 mc_reg[0] = 0x0; 2205 mc_reg[1] = CPC925_MC_START; 2206 mc_reg[2] = 0x0; 2207 mc_reg[3] = CPC925_MC_LENGTH; 2208 prom_setprop(mc, name, "reg", mc_reg, sizeof(mc_reg)); 2209 } 2210 #else 2211 #define fixup_device_tree_maple() 2212 #define fixup_device_tree_maple_memory_controller() 2213 #endif 2214 2215 #ifdef CONFIG_PPC_CHRP 2216 /* 2217 * Pegasos and BriQ lacks the "ranges" property in the isa node 2218 * Pegasos needs decimal IRQ 14/15, not hexadecimal 2219 * Pegasos has the IDE configured in legacy mode, but advertised as native 2220 */ 2221 static void __init fixup_device_tree_chrp(void) 2222 { 2223 phandle ph; 2224 u32 prop[6]; 2225 u32 rloc = 0x01006000; /* IO space; PCI device = 12 */ 2226 char *name; 2227 int rc; 2228 2229 name = "/pci@80000000/isa@c"; 2230 ph = call_prom("finddevice", 1, 1, ADDR(name)); 2231 if (!PHANDLE_VALID(ph)) { 2232 name = "/pci@ff500000/isa@6"; 2233 ph = call_prom("finddevice", 1, 1, ADDR(name)); 2234 rloc = 0x01003000; /* IO space; PCI device = 6 */ 2235 } 2236 if (PHANDLE_VALID(ph)) { 2237 rc = prom_getproplen(ph, "ranges"); 2238 if (rc == 0 || rc == PROM_ERROR) { 2239 prom_printf("Fixing up missing ISA range on Pegasos...\n"); 2240 2241 prop[0] = 0x1; 2242 prop[1] = 0x0; 2243 prop[2] = rloc; 2244 prop[3] = 0x0; 2245 prop[4] = 0x0; 2246 prop[5] = 0x00010000; 2247 prom_setprop(ph, name, "ranges", prop, sizeof(prop)); 2248 } 2249 } 2250 2251 name = "/pci@80000000/ide@C,1"; 2252 ph = call_prom("finddevice", 1, 1, ADDR(name)); 2253 if (PHANDLE_VALID(ph)) { 2254 prom_printf("Fixing up IDE interrupt on Pegasos...\n"); 2255 prop[0] = 14; 2256 prop[1] = 0x0; 2257 prom_setprop(ph, name, "interrupts", prop, 2*sizeof(u32)); 2258 prom_printf("Fixing up IDE class-code on Pegasos...\n"); 2259 rc = prom_getprop(ph, "class-code", prop, sizeof(u32)); 2260 if (rc == sizeof(u32)) { 2261 prop[0] &= ~0x5; 2262 prom_setprop(ph, name, "class-code", prop, sizeof(u32)); 2263 } 2264 } 2265 } 2266 #else 2267 #define fixup_device_tree_chrp() 2268 #endif 2269 2270 #if defined(CONFIG_PPC64) && defined(CONFIG_PPC_PMAC) 2271 static void __init fixup_device_tree_pmac(void) 2272 { 2273 phandle u3, i2c, mpic; 2274 u32 u3_rev; 2275 u32 interrupts[2]; 2276 u32 parent; 2277 2278 /* Some G5s have a missing interrupt definition, fix it up here */ 2279 u3 = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000")); 2280 if (!PHANDLE_VALID(u3)) 2281 return; 2282 i2c = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/i2c@f8001000")); 2283 if (!PHANDLE_VALID(i2c)) 2284 return; 2285 mpic = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/mpic@f8040000")); 2286 if (!PHANDLE_VALID(mpic)) 2287 return; 2288 2289 /* check if proper rev of u3 */ 2290 if (prom_getprop(u3, "device-rev", &u3_rev, sizeof(u3_rev)) 2291 == PROM_ERROR) 2292 return; 2293 if (u3_rev < 0x35 || u3_rev > 0x39) 2294 return; 2295 /* does it need fixup ? */ 2296 if (prom_getproplen(i2c, "interrupts") > 0) 2297 return; 2298 2299 prom_printf("fixing up bogus interrupts for u3 i2c...\n"); 2300 2301 /* interrupt on this revision of u3 is number 0 and level */ 2302 interrupts[0] = 0; 2303 interrupts[1] = 1; 2304 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupts", 2305 &interrupts, sizeof(interrupts)); 2306 parent = (u32)mpic; 2307 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupt-parent", 2308 &parent, sizeof(parent)); 2309 } 2310 #else 2311 #define fixup_device_tree_pmac() 2312 #endif 2313 2314 #ifdef CONFIG_PPC_EFIKA 2315 /* 2316 * The MPC5200 FEC driver requires an phy-handle property to tell it how 2317 * to talk to the phy. If the phy-handle property is missing, then this 2318 * function is called to add the appropriate nodes and link it to the 2319 * ethernet node. 2320 */ 2321 static void __init fixup_device_tree_efika_add_phy(void) 2322 { 2323 u32 node; 2324 char prop[64]; 2325 int rv; 2326 2327 /* Check if /builtin/ethernet exists - bail if it doesn't */ 2328 node = call_prom("finddevice", 1, 1, ADDR("/builtin/ethernet")); 2329 if (!PHANDLE_VALID(node)) 2330 return; 2331 2332 /* Check if the phy-handle property exists - bail if it does */ 2333 rv = prom_getprop(node, "phy-handle", prop, sizeof(prop)); 2334 if (!rv) 2335 return; 2336 2337 /* 2338 * At this point the ethernet device doesn't have a phy described. 2339 * Now we need to add the missing phy node and linkage 2340 */ 2341 2342 /* Check for an MDIO bus node - if missing then create one */ 2343 node = call_prom("finddevice", 1, 1, ADDR("/builtin/mdio")); 2344 if (!PHANDLE_VALID(node)) { 2345 prom_printf("Adding Ethernet MDIO node\n"); 2346 call_prom("interpret", 1, 1, 2347 " s\" /builtin\" find-device" 2348 " new-device" 2349 " 1 encode-int s\" #address-cells\" property" 2350 " 0 encode-int s\" #size-cells\" property" 2351 " s\" mdio\" device-name" 2352 " s\" fsl,mpc5200b-mdio\" encode-string" 2353 " s\" compatible\" property" 2354 " 0xf0003000 0x400 reg" 2355 " 0x2 encode-int" 2356 " 0x5 encode-int encode+" 2357 " 0x3 encode-int encode+" 2358 " s\" interrupts\" property" 2359 " finish-device"); 2360 }; 2361 2362 /* Check for a PHY device node - if missing then create one and 2363 * give it's phandle to the ethernet node */ 2364 node = call_prom("finddevice", 1, 1, 2365 ADDR("/builtin/mdio/ethernet-phy")); 2366 if (!PHANDLE_VALID(node)) { 2367 prom_printf("Adding Ethernet PHY node\n"); 2368 call_prom("interpret", 1, 1, 2369 " s\" /builtin/mdio\" find-device" 2370 " new-device" 2371 " s\" ethernet-phy\" device-name" 2372 " 0x10 encode-int s\" reg\" property" 2373 " my-self" 2374 " ihandle>phandle" 2375 " finish-device" 2376 " s\" /builtin/ethernet\" find-device" 2377 " encode-int" 2378 " s\" phy-handle\" property" 2379 " device-end"); 2380 } 2381 } 2382 2383 static void __init fixup_device_tree_efika(void) 2384 { 2385 int sound_irq[3] = { 2, 2, 0 }; 2386 int bcomm_irq[3*16] = { 3,0,0, 3,1,0, 3,2,0, 3,3,0, 2387 3,4,0, 3,5,0, 3,6,0, 3,7,0, 2388 3,8,0, 3,9,0, 3,10,0, 3,11,0, 2389 3,12,0, 3,13,0, 3,14,0, 3,15,0 }; 2390 u32 node; 2391 char prop[64]; 2392 int rv, len; 2393 2394 /* Check if we're really running on a EFIKA */ 2395 node = call_prom("finddevice", 1, 1, ADDR("/")); 2396 if (!PHANDLE_VALID(node)) 2397 return; 2398 2399 rv = prom_getprop(node, "model", prop, sizeof(prop)); 2400 if (rv == PROM_ERROR) 2401 return; 2402 if (strcmp(prop, "EFIKA5K2")) 2403 return; 2404 2405 prom_printf("Applying EFIKA device tree fixups\n"); 2406 2407 /* Claiming to be 'chrp' is death */ 2408 node = call_prom("finddevice", 1, 1, ADDR("/")); 2409 rv = prom_getprop(node, "device_type", prop, sizeof(prop)); 2410 if (rv != PROM_ERROR && (strcmp(prop, "chrp") == 0)) 2411 prom_setprop(node, "/", "device_type", "efika", sizeof("efika")); 2412 2413 /* CODEGEN,description is exposed in /proc/cpuinfo so 2414 fix that too */ 2415 rv = prom_getprop(node, "CODEGEN,description", prop, sizeof(prop)); 2416 if (rv != PROM_ERROR && (strstr(prop, "CHRP"))) 2417 prom_setprop(node, "/", "CODEGEN,description", 2418 "Efika 5200B PowerPC System", 2419 sizeof("Efika 5200B PowerPC System")); 2420 2421 /* Fixup bestcomm interrupts property */ 2422 node = call_prom("finddevice", 1, 1, ADDR("/builtin/bestcomm")); 2423 if (PHANDLE_VALID(node)) { 2424 len = prom_getproplen(node, "interrupts"); 2425 if (len == 12) { 2426 prom_printf("Fixing bestcomm interrupts property\n"); 2427 prom_setprop(node, "/builtin/bestcom", "interrupts", 2428 bcomm_irq, sizeof(bcomm_irq)); 2429 } 2430 } 2431 2432 /* Fixup sound interrupts property */ 2433 node = call_prom("finddevice", 1, 1, ADDR("/builtin/sound")); 2434 if (PHANDLE_VALID(node)) { 2435 rv = prom_getprop(node, "interrupts", prop, sizeof(prop)); 2436 if (rv == PROM_ERROR) { 2437 prom_printf("Adding sound interrupts property\n"); 2438 prom_setprop(node, "/builtin/sound", "interrupts", 2439 sound_irq, sizeof(sound_irq)); 2440 } 2441 } 2442 2443 /* Make sure ethernet phy-handle property exists */ 2444 fixup_device_tree_efika_add_phy(); 2445 } 2446 #else 2447 #define fixup_device_tree_efika() 2448 #endif 2449 2450 static void __init fixup_device_tree(void) 2451 { 2452 fixup_device_tree_maple(); 2453 fixup_device_tree_maple_memory_controller(); 2454 fixup_device_tree_chrp(); 2455 fixup_device_tree_pmac(); 2456 fixup_device_tree_efika(); 2457 } 2458 2459 static void __init prom_find_boot_cpu(void) 2460 { 2461 struct prom_t *_prom = &RELOC(prom); 2462 u32 getprop_rval; 2463 ihandle prom_cpu; 2464 phandle cpu_pkg; 2465 2466 _prom->cpu = 0; 2467 if (prom_getprop(_prom->chosen, "cpu", &prom_cpu, sizeof(prom_cpu)) <= 0) 2468 return; 2469 2470 cpu_pkg = call_prom("instance-to-package", 1, 1, prom_cpu); 2471 2472 prom_getprop(cpu_pkg, "reg", &getprop_rval, sizeof(getprop_rval)); 2473 _prom->cpu = getprop_rval; 2474 2475 prom_debug("Booting CPU hw index = %lu\n", _prom->cpu); 2476 } 2477 2478 static void __init prom_check_initrd(unsigned long r3, unsigned long r4) 2479 { 2480 #ifdef CONFIG_BLK_DEV_INITRD 2481 struct prom_t *_prom = &RELOC(prom); 2482 2483 if (r3 && r4 && r4 != 0xdeadbeef) { 2484 unsigned long val; 2485 2486 RELOC(prom_initrd_start) = is_kernel_addr(r3) ? __pa(r3) : r3; 2487 RELOC(prom_initrd_end) = RELOC(prom_initrd_start) + r4; 2488 2489 val = RELOC(prom_initrd_start); 2490 prom_setprop(_prom->chosen, "/chosen", "linux,initrd-start", 2491 &val, sizeof(val)); 2492 val = RELOC(prom_initrd_end); 2493 prom_setprop(_prom->chosen, "/chosen", "linux,initrd-end", 2494 &val, sizeof(val)); 2495 2496 reserve_mem(RELOC(prom_initrd_start), 2497 RELOC(prom_initrd_end) - RELOC(prom_initrd_start)); 2498 2499 prom_debug("initrd_start=0x%x\n", RELOC(prom_initrd_start)); 2500 prom_debug("initrd_end=0x%x\n", RELOC(prom_initrd_end)); 2501 } 2502 #endif /* CONFIG_BLK_DEV_INITRD */ 2503 } 2504 2505 /* 2506 * We enter here early on, when the Open Firmware prom is still 2507 * handling exceptions and the MMU hash table for us. 2508 */ 2509 2510 unsigned long __init prom_init(unsigned long r3, unsigned long r4, 2511 unsigned long pp, 2512 unsigned long r6, unsigned long r7, 2513 unsigned long kbase) 2514 { 2515 struct prom_t *_prom; 2516 unsigned long hdr; 2517 2518 #ifdef CONFIG_PPC32 2519 unsigned long offset = reloc_offset(); 2520 reloc_got2(offset); 2521 #endif 2522 2523 _prom = &RELOC(prom); 2524 2525 /* 2526 * First zero the BSS 2527 */ 2528 memset(&RELOC(__bss_start), 0, __bss_stop - __bss_start); 2529 2530 /* 2531 * Init interface to Open Firmware, get some node references, 2532 * like /chosen 2533 */ 2534 prom_init_client_services(pp); 2535 2536 /* 2537 * See if this OF is old enough that we need to do explicit maps 2538 * and other workarounds 2539 */ 2540 prom_find_mmu(); 2541 2542 /* 2543 * Init prom stdout device 2544 */ 2545 prom_init_stdout(); 2546 2547 prom_printf("Preparing to boot %s", RELOC(linux_banner)); 2548 2549 /* 2550 * Get default machine type. At this point, we do not differentiate 2551 * between pSeries SMP and pSeries LPAR 2552 */ 2553 RELOC(of_platform) = prom_find_machine_type(); 2554 2555 #ifndef CONFIG_RELOCATABLE 2556 /* Bail if this is a kdump kernel. */ 2557 if (PHYSICAL_START > 0) 2558 prom_panic("Error: You can't boot a kdump kernel from OF!\n"); 2559 #endif 2560 2561 /* 2562 * Check for an initrd 2563 */ 2564 prom_check_initrd(r3, r4); 2565 2566 #ifdef CONFIG_PPC_PSERIES 2567 /* 2568 * On pSeries, inform the firmware about our capabilities 2569 */ 2570 if (RELOC(of_platform) == PLATFORM_PSERIES || 2571 RELOC(of_platform) == PLATFORM_PSERIES_LPAR) 2572 prom_send_capabilities(); 2573 #endif 2574 2575 /* 2576 * Copy the CPU hold code 2577 */ 2578 if (RELOC(of_platform) != PLATFORM_POWERMAC) 2579 copy_and_flush(0, kbase, 0x100, 0); 2580 2581 /* 2582 * Do early parsing of command line 2583 */ 2584 early_cmdline_parse(); 2585 2586 /* 2587 * Initialize memory management within prom_init 2588 */ 2589 prom_init_mem(); 2590 2591 /* 2592 * Determine which cpu is actually running right _now_ 2593 */ 2594 prom_find_boot_cpu(); 2595 2596 /* 2597 * Initialize display devices 2598 */ 2599 prom_check_displays(); 2600 2601 #ifdef CONFIG_PPC64 2602 /* 2603 * Initialize IOMMU (TCE tables) on pSeries. Do that before anything else 2604 * that uses the allocator, we need to make sure we get the top of memory 2605 * available for us here... 2606 */ 2607 if (RELOC(of_platform) == PLATFORM_PSERIES) 2608 prom_initialize_tce_table(); 2609 #endif 2610 2611 /* 2612 * On non-powermacs, try to instantiate RTAS and puts all CPUs 2613 * in spin-loops. PowerMacs don't have a working RTAS and use 2614 * a different way to spin CPUs 2615 */ 2616 if (RELOC(of_platform) != PLATFORM_POWERMAC) { 2617 prom_instantiate_rtas(); 2618 prom_hold_cpus(); 2619 } 2620 2621 /* 2622 * Fill in some infos for use by the kernel later on 2623 */ 2624 if (RELOC(prom_memory_limit)) 2625 prom_setprop(_prom->chosen, "/chosen", "linux,memory-limit", 2626 &RELOC(prom_memory_limit), 2627 sizeof(prom_memory_limit)); 2628 #ifdef CONFIG_PPC64 2629 if (RELOC(prom_iommu_off)) 2630 prom_setprop(_prom->chosen, "/chosen", "linux,iommu-off", 2631 NULL, 0); 2632 2633 if (RELOC(prom_iommu_force_on)) 2634 prom_setprop(_prom->chosen, "/chosen", "linux,iommu-force-on", 2635 NULL, 0); 2636 2637 if (RELOC(prom_tce_alloc_start)) { 2638 prom_setprop(_prom->chosen, "/chosen", "linux,tce-alloc-start", 2639 &RELOC(prom_tce_alloc_start), 2640 sizeof(prom_tce_alloc_start)); 2641 prom_setprop(_prom->chosen, "/chosen", "linux,tce-alloc-end", 2642 &RELOC(prom_tce_alloc_end), 2643 sizeof(prom_tce_alloc_end)); 2644 } 2645 #endif 2646 2647 /* 2648 * Fixup any known bugs in the device-tree 2649 */ 2650 fixup_device_tree(); 2651 2652 /* 2653 * Now finally create the flattened device-tree 2654 */ 2655 prom_printf("copying OF device tree...\n"); 2656 flatten_device_tree(); 2657 2658 /* 2659 * in case stdin is USB and still active on IBM machines... 2660 * Unfortunately quiesce crashes on some powermacs if we have 2661 * closed stdin already (in particular the powerbook 101). 2662 */ 2663 if (RELOC(of_platform) != PLATFORM_POWERMAC) 2664 prom_close_stdin(); 2665 2666 /* 2667 * Call OF "quiesce" method to shut down pending DMA's from 2668 * devices etc... 2669 */ 2670 prom_printf("Calling quiesce...\n"); 2671 call_prom("quiesce", 0, 0); 2672 2673 /* 2674 * And finally, call the kernel passing it the flattened device 2675 * tree and NULL as r5, thus triggering the new entry point which 2676 * is common to us and kexec 2677 */ 2678 hdr = RELOC(dt_header_start); 2679 prom_printf("returning from prom_init\n"); 2680 prom_debug("->dt_header_start=0x%x\n", hdr); 2681 2682 #ifdef CONFIG_PPC32 2683 reloc_got2(-offset); 2684 #endif 2685 2686 __start(hdr, kbase, 0); 2687 2688 return 0; 2689 } 2690