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/config.h> 20 #include <linux/kernel.h> 21 #include <linux/string.h> 22 #include <linux/init.h> 23 #include <linux/threads.h> 24 #include <linux/spinlock.h> 25 #include <linux/types.h> 26 #include <linux/pci.h> 27 #include <linux/proc_fs.h> 28 #include <linux/stringify.h> 29 #include <linux/delay.h> 30 #include <linux/initrd.h> 31 #include <linux/bitops.h> 32 #include <asm/prom.h> 33 #include <asm/rtas.h> 34 #include <asm/page.h> 35 #include <asm/processor.h> 36 #include <asm/irq.h> 37 #include <asm/io.h> 38 #include <asm/smp.h> 39 #include <asm/system.h> 40 #include <asm/mmu.h> 41 #include <asm/pgtable.h> 42 #include <asm/pci.h> 43 #include <asm/iommu.h> 44 #include <asm/btext.h> 45 #include <asm/sections.h> 46 #include <asm/machdep.h> 47 48 #ifdef CONFIG_LOGO_LINUX_CLUT224 49 #include <linux/linux_logo.h> 50 extern const struct linux_logo logo_linux_clut224; 51 #endif 52 53 /* 54 * Properties whose value is longer than this get excluded from our 55 * copy of the device tree. This value does need to be big enough to 56 * ensure that we don't lose things like the interrupt-map property 57 * on a PCI-PCI bridge. 58 */ 59 #define MAX_PROPERTY_LENGTH (1UL * 1024 * 1024) 60 61 /* 62 * Eventually bump that one up 63 */ 64 #define DEVTREE_CHUNK_SIZE 0x100000 65 66 /* 67 * This is the size of the local memory reserve map that gets copied 68 * into the boot params passed to the kernel. That size is totally 69 * flexible as the kernel just reads the list until it encounters an 70 * entry with size 0, so it can be changed without breaking binary 71 * compatibility 72 */ 73 #define MEM_RESERVE_MAP_SIZE 8 74 75 /* 76 * prom_init() is called very early on, before the kernel text 77 * and data have been mapped to KERNELBASE. At this point the code 78 * is running at whatever address it has been loaded at. 79 * On ppc32 we compile with -mrelocatable, which means that references 80 * to extern and static variables get relocated automatically. 81 * On ppc64 we have to relocate the references explicitly with 82 * RELOC. (Note that strings count as static variables.) 83 * 84 * Because OF may have mapped I/O devices into the area starting at 85 * KERNELBASE, particularly on CHRP machines, we can't safely call 86 * OF once the kernel has been mapped to KERNELBASE. Therefore all 87 * OF calls must be done within prom_init(). 88 * 89 * ADDR is used in calls to call_prom. The 4th and following 90 * arguments to call_prom should be 32-bit values. 91 * On ppc64, 64 bit values are truncated to 32 bits (and 92 * fortunately don't get interpreted as two arguments). 93 */ 94 #ifdef CONFIG_PPC64 95 #define RELOC(x) (*PTRRELOC(&(x))) 96 #define ADDR(x) (u32) add_reloc_offset((unsigned long)(x)) 97 #define OF_WORKAROUNDS 0 98 #else 99 #define RELOC(x) (x) 100 #define ADDR(x) (u32) (x) 101 #define OF_WORKAROUNDS of_workarounds 102 int of_workarounds; 103 #endif 104 105 #define OF_WA_CLAIM 1 /* do phys/virt claim separately, then map */ 106 #define OF_WA_LONGTRAIL 2 /* work around longtrail bugs */ 107 108 #define PROM_BUG() do { \ 109 prom_printf("kernel BUG at %s line 0x%x!\n", \ 110 RELOC(__FILE__), __LINE__); \ 111 __asm__ __volatile__(".long " BUG_ILLEGAL_INSTR); \ 112 } while (0) 113 114 #ifdef DEBUG_PROM 115 #define prom_debug(x...) prom_printf(x) 116 #else 117 #define prom_debug(x...) 118 #endif 119 120 121 typedef u32 prom_arg_t; 122 123 struct prom_args { 124 u32 service; 125 u32 nargs; 126 u32 nret; 127 prom_arg_t args[10]; 128 }; 129 130 struct prom_t { 131 ihandle root; 132 phandle chosen; 133 int cpu; 134 ihandle stdout; 135 ihandle mmumap; 136 ihandle memory; 137 }; 138 139 struct mem_map_entry { 140 u64 base; 141 u64 size; 142 }; 143 144 typedef u32 cell_t; 145 146 extern void __start(unsigned long r3, unsigned long r4, unsigned long r5); 147 148 #ifdef CONFIG_PPC64 149 extern int enter_prom(struct prom_args *args, unsigned long entry); 150 #else 151 static inline int enter_prom(struct prom_args *args, unsigned long entry) 152 { 153 return ((int (*)(struct prom_args *))entry)(args); 154 } 155 #endif 156 157 extern void copy_and_flush(unsigned long dest, unsigned long src, 158 unsigned long size, unsigned long offset); 159 160 /* prom structure */ 161 static struct prom_t __initdata prom; 162 163 static unsigned long prom_entry __initdata; 164 165 #define PROM_SCRATCH_SIZE 256 166 167 static char __initdata of_stdout_device[256]; 168 static char __initdata prom_scratch[PROM_SCRATCH_SIZE]; 169 170 static unsigned long __initdata dt_header_start; 171 static unsigned long __initdata dt_struct_start, dt_struct_end; 172 static unsigned long __initdata dt_string_start, dt_string_end; 173 174 static unsigned long __initdata prom_initrd_start, prom_initrd_end; 175 176 #ifdef CONFIG_PPC64 177 static int __initdata iommu_force_on; 178 static int __initdata ppc64_iommu_off; 179 static unsigned long __initdata prom_tce_alloc_start; 180 static unsigned long __initdata prom_tce_alloc_end; 181 #endif 182 183 /* Platforms codes are now obsolete in the kernel. Now only used within this 184 * file and ultimately gone too. Feel free to change them if you need, they 185 * are not shared with anything outside of this file anymore 186 */ 187 #define PLATFORM_PSERIES 0x0100 188 #define PLATFORM_PSERIES_LPAR 0x0101 189 #define PLATFORM_LPAR 0x0001 190 #define PLATFORM_POWERMAC 0x0400 191 #define PLATFORM_GENERIC 0x0500 192 193 static int __initdata of_platform; 194 195 static char __initdata prom_cmd_line[COMMAND_LINE_SIZE]; 196 197 static unsigned long __initdata alloc_top; 198 static unsigned long __initdata alloc_top_high; 199 static unsigned long __initdata alloc_bottom; 200 static unsigned long __initdata rmo_top; 201 static unsigned long __initdata ram_top; 202 203 static struct mem_map_entry __initdata mem_reserve_map[MEM_RESERVE_MAP_SIZE]; 204 static int __initdata mem_reserve_cnt; 205 206 static cell_t __initdata regbuf[1024]; 207 208 209 #define MAX_CPU_THREADS 2 210 211 /* 212 * Error results ... some OF calls will return "-1" on error, some 213 * will return 0, some will return either. To simplify, here are 214 * macros to use with any ihandle or phandle return value to check if 215 * it is valid 216 */ 217 218 #define PROM_ERROR (-1u) 219 #define PHANDLE_VALID(p) ((p) != 0 && (p) != PROM_ERROR) 220 #define IHANDLE_VALID(i) ((i) != 0 && (i) != PROM_ERROR) 221 222 223 /* This is the one and *ONLY* place where we actually call open 224 * firmware. 225 */ 226 227 static int __init call_prom(const char *service, int nargs, int nret, ...) 228 { 229 int i; 230 struct prom_args args; 231 va_list list; 232 233 args.service = ADDR(service); 234 args.nargs = nargs; 235 args.nret = nret; 236 237 va_start(list, nret); 238 for (i = 0; i < nargs; i++) 239 args.args[i] = va_arg(list, prom_arg_t); 240 va_end(list); 241 242 for (i = 0; i < nret; i++) 243 args.args[nargs+i] = 0; 244 245 if (enter_prom(&args, RELOC(prom_entry)) < 0) 246 return PROM_ERROR; 247 248 return (nret > 0) ? args.args[nargs] : 0; 249 } 250 251 static int __init call_prom_ret(const char *service, int nargs, int nret, 252 prom_arg_t *rets, ...) 253 { 254 int i; 255 struct prom_args args; 256 va_list list; 257 258 args.service = ADDR(service); 259 args.nargs = nargs; 260 args.nret = nret; 261 262 va_start(list, rets); 263 for (i = 0; i < nargs; i++) 264 args.args[i] = va_arg(list, prom_arg_t); 265 va_end(list); 266 267 for (i = 0; i < nret; i++) 268 args.args[nargs+i] = 0; 269 270 if (enter_prom(&args, RELOC(prom_entry)) < 0) 271 return PROM_ERROR; 272 273 if (rets != NULL) 274 for (i = 1; i < nret; ++i) 275 rets[i-1] = args.args[nargs+i]; 276 277 return (nret > 0) ? args.args[nargs] : 0; 278 } 279 280 281 static void __init prom_print(const char *msg) 282 { 283 const char *p, *q; 284 struct prom_t *_prom = &RELOC(prom); 285 286 if (_prom->stdout == 0) 287 return; 288 289 for (p = msg; *p != 0; p = q) { 290 for (q = p; *q != 0 && *q != '\n'; ++q) 291 ; 292 if (q > p) 293 call_prom("write", 3, 1, _prom->stdout, p, q - p); 294 if (*q == 0) 295 break; 296 ++q; 297 call_prom("write", 3, 1, _prom->stdout, ADDR("\r\n"), 2); 298 } 299 } 300 301 302 static void __init prom_print_hex(unsigned long val) 303 { 304 int i, nibbles = sizeof(val)*2; 305 char buf[sizeof(val)*2+1]; 306 struct prom_t *_prom = &RELOC(prom); 307 308 for (i = nibbles-1; i >= 0; i--) { 309 buf[i] = (val & 0xf) + '0'; 310 if (buf[i] > '9') 311 buf[i] += ('a'-'0'-10); 312 val >>= 4; 313 } 314 buf[nibbles] = '\0'; 315 call_prom("write", 3, 1, _prom->stdout, buf, nibbles); 316 } 317 318 319 static void __init prom_printf(const char *format, ...) 320 { 321 const char *p, *q, *s; 322 va_list args; 323 unsigned long v; 324 struct prom_t *_prom = &RELOC(prom); 325 326 va_start(args, format); 327 #ifdef CONFIG_PPC64 328 format = PTRRELOC(format); 329 #endif 330 for (p = format; *p != 0; p = q) { 331 for (q = p; *q != 0 && *q != '\n' && *q != '%'; ++q) 332 ; 333 if (q > p) 334 call_prom("write", 3, 1, _prom->stdout, p, q - p); 335 if (*q == 0) 336 break; 337 if (*q == '\n') { 338 ++q; 339 call_prom("write", 3, 1, _prom->stdout, 340 ADDR("\r\n"), 2); 341 continue; 342 } 343 ++q; 344 if (*q == 0) 345 break; 346 switch (*q) { 347 case 's': 348 ++q; 349 s = va_arg(args, const char *); 350 prom_print(s); 351 break; 352 case 'x': 353 ++q; 354 v = va_arg(args, unsigned long); 355 prom_print_hex(v); 356 break; 357 } 358 } 359 } 360 361 362 static unsigned int __init prom_claim(unsigned long virt, unsigned long size, 363 unsigned long align) 364 { 365 struct prom_t *_prom = &RELOC(prom); 366 367 if (align == 0 && (OF_WORKAROUNDS & OF_WA_CLAIM)) { 368 /* 369 * Old OF requires we claim physical and virtual separately 370 * and then map explicitly (assuming virtual mode) 371 */ 372 int ret; 373 prom_arg_t result; 374 375 ret = call_prom_ret("call-method", 5, 2, &result, 376 ADDR("claim"), _prom->memory, 377 align, size, virt); 378 if (ret != 0 || result == -1) 379 return -1; 380 ret = call_prom_ret("call-method", 5, 2, &result, 381 ADDR("claim"), _prom->mmumap, 382 align, size, virt); 383 if (ret != 0) { 384 call_prom("call-method", 4, 1, ADDR("release"), 385 _prom->memory, size, virt); 386 return -1; 387 } 388 /* the 0x12 is M (coherence) + PP == read/write */ 389 call_prom("call-method", 6, 1, 390 ADDR("map"), _prom->mmumap, 0x12, size, virt, virt); 391 return virt; 392 } 393 return call_prom("claim", 3, 1, (prom_arg_t)virt, (prom_arg_t)size, 394 (prom_arg_t)align); 395 } 396 397 static void __init __attribute__((noreturn)) prom_panic(const char *reason) 398 { 399 #ifdef CONFIG_PPC64 400 reason = PTRRELOC(reason); 401 #endif 402 prom_print(reason); 403 /* Do not call exit because it clears the screen on pmac 404 * it also causes some sort of double-fault on early pmacs */ 405 if (RELOC(of_platform) == PLATFORM_POWERMAC) 406 asm("trap\n"); 407 408 /* ToDo: should put up an SRC here on p/iSeries */ 409 call_prom("exit", 0, 0); 410 411 for (;;) /* should never get here */ 412 ; 413 } 414 415 416 static int __init prom_next_node(phandle *nodep) 417 { 418 phandle node; 419 420 if ((node = *nodep) != 0 421 && (*nodep = call_prom("child", 1, 1, node)) != 0) 422 return 1; 423 if ((*nodep = call_prom("peer", 1, 1, node)) != 0) 424 return 1; 425 for (;;) { 426 if ((node = call_prom("parent", 1, 1, node)) == 0) 427 return 0; 428 if ((*nodep = call_prom("peer", 1, 1, node)) != 0) 429 return 1; 430 } 431 } 432 433 static int inline prom_getprop(phandle node, const char *pname, 434 void *value, size_t valuelen) 435 { 436 return call_prom("getprop", 4, 1, node, ADDR(pname), 437 (u32)(unsigned long) value, (u32) valuelen); 438 } 439 440 static int inline prom_getproplen(phandle node, const char *pname) 441 { 442 return call_prom("getproplen", 2, 1, node, ADDR(pname)); 443 } 444 445 static void add_string(char **str, const char *q) 446 { 447 char *p = *str; 448 449 while (*q) 450 *p++ = *q++; 451 *p++ = ' '; 452 *str = p; 453 } 454 455 static char *tohex(unsigned int x) 456 { 457 static char digits[] = "0123456789abcdef"; 458 static char result[9]; 459 int i; 460 461 result[8] = 0; 462 i = 8; 463 do { 464 --i; 465 result[i] = digits[x & 0xf]; 466 x >>= 4; 467 } while (x != 0 && i > 0); 468 return &result[i]; 469 } 470 471 static int __init prom_setprop(phandle node, const char *nodename, 472 const char *pname, void *value, size_t valuelen) 473 { 474 char cmd[256], *p; 475 476 if (!(OF_WORKAROUNDS & OF_WA_LONGTRAIL)) 477 return call_prom("setprop", 4, 1, node, ADDR(pname), 478 (u32)(unsigned long) value, (u32) valuelen); 479 480 /* gah... setprop doesn't work on longtrail, have to use interpret */ 481 p = cmd; 482 add_string(&p, "dev"); 483 add_string(&p, nodename); 484 add_string(&p, tohex((u32)(unsigned long) value)); 485 add_string(&p, tohex(valuelen)); 486 add_string(&p, tohex(ADDR(pname))); 487 add_string(&p, tohex(strlen(RELOC(pname)))); 488 add_string(&p, "property"); 489 *p = 0; 490 return call_prom("interpret", 1, 1, (u32)(unsigned long) cmd); 491 } 492 493 /* We can't use the standard versions because of RELOC headaches. */ 494 #define isxdigit(c) (('0' <= (c) && (c) <= '9') \ 495 || ('a' <= (c) && (c) <= 'f') \ 496 || ('A' <= (c) && (c) <= 'F')) 497 498 #define isdigit(c) ('0' <= (c) && (c) <= '9') 499 #define islower(c) ('a' <= (c) && (c) <= 'z') 500 #define toupper(c) (islower(c) ? ((c) - 'a' + 'A') : (c)) 501 502 unsigned long prom_strtoul(const char *cp, const char **endp) 503 { 504 unsigned long result = 0, base = 10, value; 505 506 if (*cp == '0') { 507 base = 8; 508 cp++; 509 if (toupper(*cp) == 'X') { 510 cp++; 511 base = 16; 512 } 513 } 514 515 while (isxdigit(*cp) && 516 (value = isdigit(*cp) ? *cp - '0' : toupper(*cp) - 'A' + 10) < base) { 517 result = result * base + value; 518 cp++; 519 } 520 521 if (endp) 522 *endp = cp; 523 524 return result; 525 } 526 527 unsigned long prom_memparse(const char *ptr, const char **retptr) 528 { 529 unsigned long ret = prom_strtoul(ptr, retptr); 530 int shift = 0; 531 532 /* 533 * We can't use a switch here because GCC *may* generate a 534 * jump table which won't work, because we're not running at 535 * the address we're linked at. 536 */ 537 if ('G' == **retptr || 'g' == **retptr) 538 shift = 30; 539 540 if ('M' == **retptr || 'm' == **retptr) 541 shift = 20; 542 543 if ('K' == **retptr || 'k' == **retptr) 544 shift = 10; 545 546 if (shift) { 547 ret <<= shift; 548 (*retptr)++; 549 } 550 551 return ret; 552 } 553 554 /* 555 * Early parsing of the command line passed to the kernel, used for 556 * "mem=x" and the options that affect the iommu 557 */ 558 static void __init early_cmdline_parse(void) 559 { 560 struct prom_t *_prom = &RELOC(prom); 561 const char *opt; 562 char *p; 563 int l = 0; 564 565 RELOC(prom_cmd_line[0]) = 0; 566 p = RELOC(prom_cmd_line); 567 if ((long)_prom->chosen > 0) 568 l = prom_getprop(_prom->chosen, "bootargs", p, COMMAND_LINE_SIZE-1); 569 #ifdef CONFIG_CMDLINE 570 if (l <= 0 || p[0] == '\0') /* dbl check */ 571 strlcpy(RELOC(prom_cmd_line), 572 RELOC(CONFIG_CMDLINE), sizeof(prom_cmd_line)); 573 #endif /* CONFIG_CMDLINE */ 574 prom_printf("command line: %s\n", RELOC(prom_cmd_line)); 575 576 #ifdef CONFIG_PPC64 577 opt = strstr(RELOC(prom_cmd_line), RELOC("iommu=")); 578 if (opt) { 579 prom_printf("iommu opt is: %s\n", opt); 580 opt += 6; 581 while (*opt && *opt == ' ') 582 opt++; 583 if (!strncmp(opt, RELOC("off"), 3)) 584 RELOC(ppc64_iommu_off) = 1; 585 else if (!strncmp(opt, RELOC("force"), 5)) 586 RELOC(iommu_force_on) = 1; 587 } 588 #endif 589 } 590 591 #ifdef CONFIG_PPC_PSERIES 592 /* 593 * There are two methods for telling firmware what our capabilities are. 594 * Newer machines have an "ibm,client-architecture-support" method on the 595 * root node. For older machines, we have to call the "process-elf-header" 596 * method in the /packages/elf-loader node, passing it a fake 32-bit 597 * ELF header containing a couple of PT_NOTE sections that contain 598 * structures that contain various information. 599 */ 600 601 /* 602 * New method - extensible architecture description vector. 603 * 604 * Because the description vector contains a mix of byte and word 605 * values, we declare it as an unsigned char array, and use this 606 * macro to put word values in. 607 */ 608 #define W(x) ((x) >> 24) & 0xff, ((x) >> 16) & 0xff, \ 609 ((x) >> 8) & 0xff, (x) & 0xff 610 611 /* Option vector bits - generic bits in byte 1 */ 612 #define OV_IGNORE 0x80 /* ignore this vector */ 613 #define OV_CESSATION_POLICY 0x40 /* halt if unsupported option present*/ 614 615 /* Option vector 1: processor architectures supported */ 616 #define OV1_PPC_2_00 0x80 /* set if we support PowerPC 2.00 */ 617 #define OV1_PPC_2_01 0x40 /* set if we support PowerPC 2.01 */ 618 #define OV1_PPC_2_02 0x20 /* set if we support PowerPC 2.02 */ 619 #define OV1_PPC_2_03 0x10 /* set if we support PowerPC 2.03 */ 620 #define OV1_PPC_2_04 0x08 /* set if we support PowerPC 2.04 */ 621 #define OV1_PPC_2_05 0x04 /* set if we support PowerPC 2.05 */ 622 623 /* Option vector 2: Open Firmware options supported */ 624 #define OV2_REAL_MODE 0x20 /* set if we want OF in real mode */ 625 626 /* Option vector 3: processor options supported */ 627 #define OV3_FP 0x80 /* floating point */ 628 #define OV3_VMX 0x40 /* VMX/Altivec */ 629 630 /* Option vector 5: PAPR/OF options supported */ 631 #define OV5_LPAR 0x80 /* logical partitioning supported */ 632 #define OV5_SPLPAR 0x40 /* shared-processor LPAR supported */ 633 /* ibm,dynamic-reconfiguration-memory property supported */ 634 #define OV5_DRCONF_MEMORY 0x20 635 #define OV5_LARGE_PAGES 0x10 /* large pages supported */ 636 637 /* 638 * The architecture vector has an array of PVR mask/value pairs, 639 * followed by # option vectors - 1, followed by the option vectors. 640 */ 641 static unsigned char ibm_architecture_vec[] = { 642 W(0xfffe0000), W(0x003a0000), /* POWER5/POWER5+ */ 643 W(0xffff0000), W(0x003e0000), /* POWER6 */ 644 W(0xfffffffe), W(0x0f000001), /* all 2.04-compliant and earlier */ 645 5 - 1, /* 5 option vectors */ 646 647 /* option vector 1: processor architectures supported */ 648 3 - 1, /* length */ 649 0, /* don't ignore, don't halt */ 650 OV1_PPC_2_00 | OV1_PPC_2_01 | OV1_PPC_2_02 | OV1_PPC_2_03 | 651 OV1_PPC_2_04 | OV1_PPC_2_05, 652 653 /* option vector 2: Open Firmware options supported */ 654 34 - 1, /* length */ 655 OV2_REAL_MODE, 656 0, 0, 657 W(0xffffffff), /* real_base */ 658 W(0xffffffff), /* real_size */ 659 W(0xffffffff), /* virt_base */ 660 W(0xffffffff), /* virt_size */ 661 W(0xffffffff), /* load_base */ 662 W(64), /* 128MB min RMA */ 663 W(0xffffffff), /* full client load */ 664 0, /* min RMA percentage of total RAM */ 665 48, /* max log_2(hash table size) */ 666 667 /* option vector 3: processor options supported */ 668 3 - 1, /* length */ 669 0, /* don't ignore, don't halt */ 670 OV3_FP | OV3_VMX, 671 672 /* option vector 4: IBM PAPR implementation */ 673 2 - 1, /* length */ 674 0, /* don't halt */ 675 676 /* option vector 5: PAPR/OF options */ 677 3 - 1, /* length */ 678 0, /* don't ignore, don't halt */ 679 OV5_LPAR | OV5_SPLPAR | OV5_LARGE_PAGES, 680 }; 681 682 /* Old method - ELF header with PT_NOTE sections */ 683 static struct fake_elf { 684 Elf32_Ehdr elfhdr; 685 Elf32_Phdr phdr[2]; 686 struct chrpnote { 687 u32 namesz; 688 u32 descsz; 689 u32 type; 690 char name[8]; /* "PowerPC" */ 691 struct chrpdesc { 692 u32 real_mode; 693 u32 real_base; 694 u32 real_size; 695 u32 virt_base; 696 u32 virt_size; 697 u32 load_base; 698 } chrpdesc; 699 } chrpnote; 700 struct rpanote { 701 u32 namesz; 702 u32 descsz; 703 u32 type; 704 char name[24]; /* "IBM,RPA-Client-Config" */ 705 struct rpadesc { 706 u32 lpar_affinity; 707 u32 min_rmo_size; 708 u32 min_rmo_percent; 709 u32 max_pft_size; 710 u32 splpar; 711 u32 min_load; 712 u32 new_mem_def; 713 u32 ignore_me; 714 } rpadesc; 715 } rpanote; 716 } fake_elf = { 717 .elfhdr = { 718 .e_ident = { 0x7f, 'E', 'L', 'F', 719 ELFCLASS32, ELFDATA2MSB, EV_CURRENT }, 720 .e_type = ET_EXEC, /* yeah right */ 721 .e_machine = EM_PPC, 722 .e_version = EV_CURRENT, 723 .e_phoff = offsetof(struct fake_elf, phdr), 724 .e_phentsize = sizeof(Elf32_Phdr), 725 .e_phnum = 2 726 }, 727 .phdr = { 728 [0] = { 729 .p_type = PT_NOTE, 730 .p_offset = offsetof(struct fake_elf, chrpnote), 731 .p_filesz = sizeof(struct chrpnote) 732 }, [1] = { 733 .p_type = PT_NOTE, 734 .p_offset = offsetof(struct fake_elf, rpanote), 735 .p_filesz = sizeof(struct rpanote) 736 } 737 }, 738 .chrpnote = { 739 .namesz = sizeof("PowerPC"), 740 .descsz = sizeof(struct chrpdesc), 741 .type = 0x1275, 742 .name = "PowerPC", 743 .chrpdesc = { 744 .real_mode = ~0U, /* ~0 means "don't care" */ 745 .real_base = ~0U, 746 .real_size = ~0U, 747 .virt_base = ~0U, 748 .virt_size = ~0U, 749 .load_base = ~0U 750 }, 751 }, 752 .rpanote = { 753 .namesz = sizeof("IBM,RPA-Client-Config"), 754 .descsz = sizeof(struct rpadesc), 755 .type = 0x12759999, 756 .name = "IBM,RPA-Client-Config", 757 .rpadesc = { 758 .lpar_affinity = 0, 759 .min_rmo_size = 64, /* in megabytes */ 760 .min_rmo_percent = 0, 761 .max_pft_size = 48, /* 2^48 bytes max PFT size */ 762 .splpar = 1, 763 .min_load = ~0U, 764 .new_mem_def = 0 765 } 766 } 767 }; 768 769 static void __init prom_send_capabilities(void) 770 { 771 ihandle elfloader, root; 772 prom_arg_t ret; 773 774 root = call_prom("open", 1, 1, ADDR("/")); 775 if (root != 0) { 776 /* try calling the ibm,client-architecture-support method */ 777 if (call_prom_ret("call-method", 3, 2, &ret, 778 ADDR("ibm,client-architecture-support"), 779 root, 780 ADDR(ibm_architecture_vec)) == 0) { 781 /* the call exists... */ 782 if (ret) 783 prom_printf("WARNING: ibm,client-architecture" 784 "-support call FAILED!\n"); 785 call_prom("close", 1, 0, root); 786 return; 787 } 788 call_prom("close", 1, 0, root); 789 } 790 791 /* no ibm,client-architecture-support call, try the old way */ 792 elfloader = call_prom("open", 1, 1, ADDR("/packages/elf-loader")); 793 if (elfloader == 0) { 794 prom_printf("couldn't open /packages/elf-loader\n"); 795 return; 796 } 797 call_prom("call-method", 3, 1, ADDR("process-elf-header"), 798 elfloader, ADDR(&fake_elf)); 799 call_prom("close", 1, 0, elfloader); 800 } 801 #endif 802 803 /* 804 * Memory allocation strategy... our layout is normally: 805 * 806 * at 14Mb or more we have vmlinux, then a gap and initrd. In some 807 * rare cases, initrd might end up being before the kernel though. 808 * We assume this won't override the final kernel at 0, we have no 809 * provision to handle that in this version, but it should hopefully 810 * never happen. 811 * 812 * alloc_top is set to the top of RMO, eventually shrink down if the 813 * TCEs overlap 814 * 815 * alloc_bottom is set to the top of kernel/initrd 816 * 817 * from there, allocations are done this way : rtas is allocated 818 * topmost, and the device-tree is allocated from the bottom. We try 819 * to grow the device-tree allocation as we progress. If we can't, 820 * then we fail, we don't currently have a facility to restart 821 * elsewhere, but that shouldn't be necessary. 822 * 823 * Note that calls to reserve_mem have to be done explicitly, memory 824 * allocated with either alloc_up or alloc_down isn't automatically 825 * reserved. 826 */ 827 828 829 /* 830 * Allocates memory in the RMO upward from the kernel/initrd 831 * 832 * When align is 0, this is a special case, it means to allocate in place 833 * at the current location of alloc_bottom or fail (that is basically 834 * extending the previous allocation). Used for the device-tree flattening 835 */ 836 static unsigned long __init alloc_up(unsigned long size, unsigned long align) 837 { 838 unsigned long base = RELOC(alloc_bottom); 839 unsigned long addr = 0; 840 841 if (align) 842 base = _ALIGN_UP(base, align); 843 prom_debug("alloc_up(%x, %x)\n", size, align); 844 if (RELOC(ram_top) == 0) 845 prom_panic("alloc_up() called with mem not initialized\n"); 846 847 if (align) 848 base = _ALIGN_UP(RELOC(alloc_bottom), align); 849 else 850 base = RELOC(alloc_bottom); 851 852 for(; (base + size) <= RELOC(alloc_top); 853 base = _ALIGN_UP(base + 0x100000, align)) { 854 prom_debug(" trying: 0x%x\n\r", base); 855 addr = (unsigned long)prom_claim(base, size, 0); 856 if (addr != PROM_ERROR && addr != 0) 857 break; 858 addr = 0; 859 if (align == 0) 860 break; 861 } 862 if (addr == 0) 863 return 0; 864 RELOC(alloc_bottom) = addr; 865 866 prom_debug(" -> %x\n", addr); 867 prom_debug(" alloc_bottom : %x\n", RELOC(alloc_bottom)); 868 prom_debug(" alloc_top : %x\n", RELOC(alloc_top)); 869 prom_debug(" alloc_top_hi : %x\n", RELOC(alloc_top_high)); 870 prom_debug(" rmo_top : %x\n", RELOC(rmo_top)); 871 prom_debug(" ram_top : %x\n", RELOC(ram_top)); 872 873 return addr; 874 } 875 876 /* 877 * Allocates memory downward, either from top of RMO, or if highmem 878 * is set, from the top of RAM. Note that this one doesn't handle 879 * failures. It does claim memory if highmem is not set. 880 */ 881 static unsigned long __init alloc_down(unsigned long size, unsigned long align, 882 int highmem) 883 { 884 unsigned long base, addr = 0; 885 886 prom_debug("alloc_down(%x, %x, %s)\n", size, align, 887 highmem ? RELOC("(high)") : RELOC("(low)")); 888 if (RELOC(ram_top) == 0) 889 prom_panic("alloc_down() called with mem not initialized\n"); 890 891 if (highmem) { 892 /* Carve out storage for the TCE table. */ 893 addr = _ALIGN_DOWN(RELOC(alloc_top_high) - size, align); 894 if (addr <= RELOC(alloc_bottom)) 895 return 0; 896 /* Will we bump into the RMO ? If yes, check out that we 897 * didn't overlap existing allocations there, if we did, 898 * we are dead, we must be the first in town ! 899 */ 900 if (addr < RELOC(rmo_top)) { 901 /* Good, we are first */ 902 if (RELOC(alloc_top) == RELOC(rmo_top)) 903 RELOC(alloc_top) = RELOC(rmo_top) = addr; 904 else 905 return 0; 906 } 907 RELOC(alloc_top_high) = addr; 908 goto bail; 909 } 910 911 base = _ALIGN_DOWN(RELOC(alloc_top) - size, align); 912 for (; base > RELOC(alloc_bottom); 913 base = _ALIGN_DOWN(base - 0x100000, align)) { 914 prom_debug(" trying: 0x%x\n\r", base); 915 addr = (unsigned long)prom_claim(base, size, 0); 916 if (addr != PROM_ERROR && addr != 0) 917 break; 918 addr = 0; 919 } 920 if (addr == 0) 921 return 0; 922 RELOC(alloc_top) = addr; 923 924 bail: 925 prom_debug(" -> %x\n", addr); 926 prom_debug(" alloc_bottom : %x\n", RELOC(alloc_bottom)); 927 prom_debug(" alloc_top : %x\n", RELOC(alloc_top)); 928 prom_debug(" alloc_top_hi : %x\n", RELOC(alloc_top_high)); 929 prom_debug(" rmo_top : %x\n", RELOC(rmo_top)); 930 prom_debug(" ram_top : %x\n", RELOC(ram_top)); 931 932 return addr; 933 } 934 935 /* 936 * Parse a "reg" cell 937 */ 938 static unsigned long __init prom_next_cell(int s, cell_t **cellp) 939 { 940 cell_t *p = *cellp; 941 unsigned long r = 0; 942 943 /* Ignore more than 2 cells */ 944 while (s > sizeof(unsigned long) / 4) { 945 p++; 946 s--; 947 } 948 r = *p++; 949 #ifdef CONFIG_PPC64 950 if (s > 1) { 951 r <<= 32; 952 r |= *(p++); 953 } 954 #endif 955 *cellp = p; 956 return r; 957 } 958 959 /* 960 * Very dumb function for adding to the memory reserve list, but 961 * we don't need anything smarter at this point 962 * 963 * XXX Eventually check for collisions. They should NEVER happen. 964 * If problems seem to show up, it would be a good start to track 965 * them down. 966 */ 967 static void reserve_mem(u64 base, u64 size) 968 { 969 u64 top = base + size; 970 unsigned long cnt = RELOC(mem_reserve_cnt); 971 972 if (size == 0) 973 return; 974 975 /* We need to always keep one empty entry so that we 976 * have our terminator with "size" set to 0 since we are 977 * dumb and just copy this entire array to the boot params 978 */ 979 base = _ALIGN_DOWN(base, PAGE_SIZE); 980 top = _ALIGN_UP(top, PAGE_SIZE); 981 size = top - base; 982 983 if (cnt >= (MEM_RESERVE_MAP_SIZE - 1)) 984 prom_panic("Memory reserve map exhausted !\n"); 985 RELOC(mem_reserve_map)[cnt].base = base; 986 RELOC(mem_reserve_map)[cnt].size = size; 987 RELOC(mem_reserve_cnt) = cnt + 1; 988 } 989 990 /* 991 * Initialize memory allocation mecanism, parse "memory" nodes and 992 * obtain that way the top of memory and RMO to setup out local allocator 993 */ 994 static void __init prom_init_mem(void) 995 { 996 phandle node; 997 char *path, type[64]; 998 unsigned int plen; 999 cell_t *p, *endp; 1000 struct prom_t *_prom = &RELOC(prom); 1001 u32 rac, rsc; 1002 1003 /* 1004 * We iterate the memory nodes to find 1005 * 1) top of RMO (first node) 1006 * 2) top of memory 1007 */ 1008 rac = 2; 1009 prom_getprop(_prom->root, "#address-cells", &rac, sizeof(rac)); 1010 rsc = 1; 1011 prom_getprop(_prom->root, "#size-cells", &rsc, sizeof(rsc)); 1012 prom_debug("root_addr_cells: %x\n", (unsigned long) rac); 1013 prom_debug("root_size_cells: %x\n", (unsigned long) rsc); 1014 1015 prom_debug("scanning memory:\n"); 1016 path = RELOC(prom_scratch); 1017 1018 for (node = 0; prom_next_node(&node); ) { 1019 type[0] = 0; 1020 prom_getprop(node, "device_type", type, sizeof(type)); 1021 1022 if (type[0] == 0) { 1023 /* 1024 * CHRP Longtrail machines have no device_type 1025 * on the memory node, so check the name instead... 1026 */ 1027 prom_getprop(node, "name", type, sizeof(type)); 1028 } 1029 if (strcmp(type, RELOC("memory"))) 1030 continue; 1031 1032 plen = prom_getprop(node, "reg", RELOC(regbuf), sizeof(regbuf)); 1033 if (plen > sizeof(regbuf)) { 1034 prom_printf("memory node too large for buffer !\n"); 1035 plen = sizeof(regbuf); 1036 } 1037 p = RELOC(regbuf); 1038 endp = p + (plen / sizeof(cell_t)); 1039 1040 #ifdef DEBUG_PROM 1041 memset(path, 0, PROM_SCRATCH_SIZE); 1042 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1); 1043 prom_debug(" node %s :\n", path); 1044 #endif /* DEBUG_PROM */ 1045 1046 while ((endp - p) >= (rac + rsc)) { 1047 unsigned long base, size; 1048 1049 base = prom_next_cell(rac, &p); 1050 size = prom_next_cell(rsc, &p); 1051 1052 if (size == 0) 1053 continue; 1054 prom_debug(" %x %x\n", base, size); 1055 if (base == 0 && (RELOC(of_platform) & PLATFORM_LPAR)) 1056 RELOC(rmo_top) = size; 1057 if ((base + size) > RELOC(ram_top)) 1058 RELOC(ram_top) = base + size; 1059 } 1060 } 1061 1062 RELOC(alloc_bottom) = PAGE_ALIGN((unsigned long)&RELOC(_end) + 0x4000); 1063 1064 /* Check if we have an initrd after the kernel, if we do move our bottom 1065 * point to after it 1066 */ 1067 if (RELOC(prom_initrd_start)) { 1068 if (RELOC(prom_initrd_end) > RELOC(alloc_bottom)) 1069 RELOC(alloc_bottom) = PAGE_ALIGN(RELOC(prom_initrd_end)); 1070 } 1071 1072 /* 1073 * Setup our top alloc point, that is top of RMO or top of 1074 * segment 0 when running non-LPAR. 1075 * Some RS64 machines have buggy firmware where claims up at 1076 * 1GB fail. Cap at 768MB as a workaround. 1077 * Since 768MB is plenty of room, and we need to cap to something 1078 * reasonable on 32-bit, cap at 768MB on all machines. 1079 */ 1080 if (!RELOC(rmo_top)) 1081 RELOC(rmo_top) = RELOC(ram_top); 1082 RELOC(rmo_top) = min(0x30000000ul, RELOC(rmo_top)); 1083 RELOC(alloc_top) = RELOC(rmo_top); 1084 RELOC(alloc_top_high) = RELOC(ram_top); 1085 1086 prom_printf("memory layout at init:\n"); 1087 prom_printf(" alloc_bottom : %x\n", RELOC(alloc_bottom)); 1088 prom_printf(" alloc_top : %x\n", RELOC(alloc_top)); 1089 prom_printf(" alloc_top_hi : %x\n", RELOC(alloc_top_high)); 1090 prom_printf(" rmo_top : %x\n", RELOC(rmo_top)); 1091 prom_printf(" ram_top : %x\n", RELOC(ram_top)); 1092 } 1093 1094 1095 /* 1096 * Allocate room for and instantiate RTAS 1097 */ 1098 static void __init prom_instantiate_rtas(void) 1099 { 1100 phandle rtas_node; 1101 ihandle rtas_inst; 1102 u32 base, entry = 0; 1103 u32 size = 0; 1104 1105 prom_debug("prom_instantiate_rtas: start...\n"); 1106 1107 rtas_node = call_prom("finddevice", 1, 1, ADDR("/rtas")); 1108 prom_debug("rtas_node: %x\n", rtas_node); 1109 if (!PHANDLE_VALID(rtas_node)) 1110 return; 1111 1112 prom_getprop(rtas_node, "rtas-size", &size, sizeof(size)); 1113 if (size == 0) 1114 return; 1115 1116 base = alloc_down(size, PAGE_SIZE, 0); 1117 if (base == 0) { 1118 prom_printf("RTAS allocation failed !\n"); 1119 return; 1120 } 1121 1122 rtas_inst = call_prom("open", 1, 1, ADDR("/rtas")); 1123 if (!IHANDLE_VALID(rtas_inst)) { 1124 prom_printf("opening rtas package failed (%x)\n", rtas_inst); 1125 return; 1126 } 1127 1128 prom_printf("instantiating rtas at 0x%x ...", base); 1129 1130 if (call_prom_ret("call-method", 3, 2, &entry, 1131 ADDR("instantiate-rtas"), 1132 rtas_inst, base) != 0 1133 || entry == 0) { 1134 prom_printf(" failed\n"); 1135 return; 1136 } 1137 prom_printf(" done\n"); 1138 1139 reserve_mem(base, size); 1140 1141 prom_setprop(rtas_node, "/rtas", "linux,rtas-base", 1142 &base, sizeof(base)); 1143 prom_setprop(rtas_node, "/rtas", "linux,rtas-entry", 1144 &entry, sizeof(entry)); 1145 1146 prom_debug("rtas base = 0x%x\n", base); 1147 prom_debug("rtas entry = 0x%x\n", entry); 1148 prom_debug("rtas size = 0x%x\n", (long)size); 1149 1150 prom_debug("prom_instantiate_rtas: end...\n"); 1151 } 1152 1153 #ifdef CONFIG_PPC64 1154 /* 1155 * Allocate room for and initialize TCE tables 1156 */ 1157 static void __init prom_initialize_tce_table(void) 1158 { 1159 phandle node; 1160 ihandle phb_node; 1161 char compatible[64], type[64], model[64]; 1162 char *path = RELOC(prom_scratch); 1163 u64 base, align; 1164 u32 minalign, minsize; 1165 u64 tce_entry, *tce_entryp; 1166 u64 local_alloc_top, local_alloc_bottom; 1167 u64 i; 1168 1169 if (RELOC(ppc64_iommu_off)) 1170 return; 1171 1172 prom_debug("starting prom_initialize_tce_table\n"); 1173 1174 /* Cache current top of allocs so we reserve a single block */ 1175 local_alloc_top = RELOC(alloc_top_high); 1176 local_alloc_bottom = local_alloc_top; 1177 1178 /* Search all nodes looking for PHBs. */ 1179 for (node = 0; prom_next_node(&node); ) { 1180 compatible[0] = 0; 1181 type[0] = 0; 1182 model[0] = 0; 1183 prom_getprop(node, "compatible", 1184 compatible, sizeof(compatible)); 1185 prom_getprop(node, "device_type", type, sizeof(type)); 1186 prom_getprop(node, "model", model, sizeof(model)); 1187 1188 if ((type[0] == 0) || (strstr(type, RELOC("pci")) == NULL)) 1189 continue; 1190 1191 /* Keep the old logic in tack to avoid regression. */ 1192 if (compatible[0] != 0) { 1193 if ((strstr(compatible, RELOC("python")) == NULL) && 1194 (strstr(compatible, RELOC("Speedwagon")) == NULL) && 1195 (strstr(compatible, RELOC("Winnipeg")) == NULL)) 1196 continue; 1197 } else if (model[0] != 0) { 1198 if ((strstr(model, RELOC("ython")) == NULL) && 1199 (strstr(model, RELOC("peedwagon")) == NULL) && 1200 (strstr(model, RELOC("innipeg")) == NULL)) 1201 continue; 1202 } 1203 1204 if (prom_getprop(node, "tce-table-minalign", &minalign, 1205 sizeof(minalign)) == PROM_ERROR) 1206 minalign = 0; 1207 if (prom_getprop(node, "tce-table-minsize", &minsize, 1208 sizeof(minsize)) == PROM_ERROR) 1209 minsize = 4UL << 20; 1210 1211 /* 1212 * Even though we read what OF wants, we just set the table 1213 * size to 4 MB. This is enough to map 2GB of PCI DMA space. 1214 * By doing this, we avoid the pitfalls of trying to DMA to 1215 * MMIO space and the DMA alias hole. 1216 * 1217 * On POWER4, firmware sets the TCE region by assuming 1218 * each TCE table is 8MB. Using this memory for anything 1219 * else will impact performance, so we always allocate 8MB. 1220 * Anton 1221 */ 1222 if (__is_processor(PV_POWER4) || __is_processor(PV_POWER4p)) 1223 minsize = 8UL << 20; 1224 else 1225 minsize = 4UL << 20; 1226 1227 /* Align to the greater of the align or size */ 1228 align = max(minalign, minsize); 1229 base = alloc_down(minsize, align, 1); 1230 if (base == 0) 1231 prom_panic("ERROR, cannot find space for TCE table.\n"); 1232 if (base < local_alloc_bottom) 1233 local_alloc_bottom = base; 1234 1235 /* It seems OF doesn't null-terminate the path :-( */ 1236 memset(path, 0, sizeof(path)); 1237 /* Call OF to setup the TCE hardware */ 1238 if (call_prom("package-to-path", 3, 1, node, 1239 path, PROM_SCRATCH_SIZE-1) == PROM_ERROR) { 1240 prom_printf("package-to-path failed\n"); 1241 } 1242 1243 /* Save away the TCE table attributes for later use. */ 1244 prom_setprop(node, path, "linux,tce-base", &base, sizeof(base)); 1245 prom_setprop(node, path, "linux,tce-size", &minsize, sizeof(minsize)); 1246 1247 prom_debug("TCE table: %s\n", path); 1248 prom_debug("\tnode = 0x%x\n", node); 1249 prom_debug("\tbase = 0x%x\n", base); 1250 prom_debug("\tsize = 0x%x\n", minsize); 1251 1252 /* Initialize the table to have a one-to-one mapping 1253 * over the allocated size. 1254 */ 1255 tce_entryp = (unsigned long *)base; 1256 for (i = 0; i < (minsize >> 3) ;tce_entryp++, i++) { 1257 tce_entry = (i << PAGE_SHIFT); 1258 tce_entry |= 0x3; 1259 *tce_entryp = tce_entry; 1260 } 1261 1262 prom_printf("opening PHB %s", path); 1263 phb_node = call_prom("open", 1, 1, path); 1264 if (phb_node == 0) 1265 prom_printf("... failed\n"); 1266 else 1267 prom_printf("... done\n"); 1268 1269 call_prom("call-method", 6, 0, ADDR("set-64-bit-addressing"), 1270 phb_node, -1, minsize, 1271 (u32) base, (u32) (base >> 32)); 1272 call_prom("close", 1, 0, phb_node); 1273 } 1274 1275 reserve_mem(local_alloc_bottom, local_alloc_top - local_alloc_bottom); 1276 1277 /* These are only really needed if there is a memory limit in 1278 * effect, but we don't know so export them always. */ 1279 RELOC(prom_tce_alloc_start) = local_alloc_bottom; 1280 RELOC(prom_tce_alloc_end) = local_alloc_top; 1281 1282 /* Flag the first invalid entry */ 1283 prom_debug("ending prom_initialize_tce_table\n"); 1284 } 1285 #endif 1286 1287 /* 1288 * With CHRP SMP we need to use the OF to start the other processors. 1289 * We can't wait until smp_boot_cpus (the OF is trashed by then) 1290 * so we have to put the processors into a holding pattern controlled 1291 * by the kernel (not OF) before we destroy the OF. 1292 * 1293 * This uses a chunk of low memory, puts some holding pattern 1294 * code there and sends the other processors off to there until 1295 * smp_boot_cpus tells them to do something. The holding pattern 1296 * checks that address until its cpu # is there, when it is that 1297 * cpu jumps to __secondary_start(). smp_boot_cpus() takes care 1298 * of setting those values. 1299 * 1300 * We also use physical address 0x4 here to tell when a cpu 1301 * is in its holding pattern code. 1302 * 1303 * -- Cort 1304 */ 1305 extern void __secondary_hold(void); 1306 extern unsigned long __secondary_hold_spinloop; 1307 extern unsigned long __secondary_hold_acknowledge; 1308 1309 /* 1310 * We want to reference the copy of __secondary_hold_* in the 1311 * 0 - 0x100 address range 1312 */ 1313 #define LOW_ADDR(x) (((unsigned long) &(x)) & 0xff) 1314 1315 static void __init prom_hold_cpus(void) 1316 { 1317 unsigned long i; 1318 unsigned int reg; 1319 phandle node; 1320 char type[64]; 1321 int cpuid = 0; 1322 unsigned int interrupt_server[MAX_CPU_THREADS]; 1323 unsigned int cpu_threads, hw_cpu_num; 1324 int propsize; 1325 struct prom_t *_prom = &RELOC(prom); 1326 unsigned long *spinloop 1327 = (void *) LOW_ADDR(__secondary_hold_spinloop); 1328 unsigned long *acknowledge 1329 = (void *) LOW_ADDR(__secondary_hold_acknowledge); 1330 #ifdef CONFIG_PPC64 1331 /* __secondary_hold is actually a descriptor, not the text address */ 1332 unsigned long secondary_hold 1333 = __pa(*PTRRELOC((unsigned long *)__secondary_hold)); 1334 #else 1335 unsigned long secondary_hold = LOW_ADDR(__secondary_hold); 1336 #endif 1337 1338 prom_debug("prom_hold_cpus: start...\n"); 1339 prom_debug(" 1) spinloop = 0x%x\n", (unsigned long)spinloop); 1340 prom_debug(" 1) *spinloop = 0x%x\n", *spinloop); 1341 prom_debug(" 1) acknowledge = 0x%x\n", 1342 (unsigned long)acknowledge); 1343 prom_debug(" 1) *acknowledge = 0x%x\n", *acknowledge); 1344 prom_debug(" 1) secondary_hold = 0x%x\n", secondary_hold); 1345 1346 /* Set the common spinloop variable, so all of the secondary cpus 1347 * will block when they are awakened from their OF spinloop. 1348 * This must occur for both SMP and non SMP kernels, since OF will 1349 * be trashed when we move the kernel. 1350 */ 1351 *spinloop = 0; 1352 1353 /* look for cpus */ 1354 for (node = 0; prom_next_node(&node); ) { 1355 type[0] = 0; 1356 prom_getprop(node, "device_type", type, sizeof(type)); 1357 if (strcmp(type, RELOC("cpu")) != 0) 1358 continue; 1359 1360 /* Skip non-configured cpus. */ 1361 if (prom_getprop(node, "status", type, sizeof(type)) > 0) 1362 if (strcmp(type, RELOC("okay")) != 0) 1363 continue; 1364 1365 reg = -1; 1366 prom_getprop(node, "reg", ®, sizeof(reg)); 1367 1368 prom_debug("\ncpuid = 0x%x\n", cpuid); 1369 prom_debug("cpu hw idx = 0x%x\n", reg); 1370 1371 /* Init the acknowledge var which will be reset by 1372 * the secondary cpu when it awakens from its OF 1373 * spinloop. 1374 */ 1375 *acknowledge = (unsigned long)-1; 1376 1377 propsize = prom_getprop(node, "ibm,ppc-interrupt-server#s", 1378 &interrupt_server, 1379 sizeof(interrupt_server)); 1380 if (propsize < 0) { 1381 /* no property. old hardware has no SMT */ 1382 cpu_threads = 1; 1383 interrupt_server[0] = reg; /* fake it with phys id */ 1384 } else { 1385 /* We have a threaded processor */ 1386 cpu_threads = propsize / sizeof(u32); 1387 if (cpu_threads > MAX_CPU_THREADS) { 1388 prom_printf("SMT: too many threads!\n" 1389 "SMT: found %x, max is %x\n", 1390 cpu_threads, MAX_CPU_THREADS); 1391 cpu_threads = 1; /* ToDo: panic? */ 1392 } 1393 } 1394 1395 hw_cpu_num = interrupt_server[0]; 1396 if (hw_cpu_num != _prom->cpu) { 1397 /* Primary Thread of non-boot cpu */ 1398 prom_printf("%x : starting cpu hw idx %x... ", cpuid, reg); 1399 call_prom("start-cpu", 3, 0, node, 1400 secondary_hold, reg); 1401 1402 for (i = 0; (i < 100000000) && 1403 (*acknowledge == ((unsigned long)-1)); i++ ) 1404 mb(); 1405 1406 if (*acknowledge == reg) 1407 prom_printf("done\n"); 1408 else 1409 prom_printf("failed: %x\n", *acknowledge); 1410 } 1411 #ifdef CONFIG_SMP 1412 else 1413 prom_printf("%x : boot cpu %x\n", cpuid, reg); 1414 #endif /* CONFIG_SMP */ 1415 1416 /* Reserve cpu #s for secondary threads. They start later. */ 1417 cpuid += cpu_threads; 1418 } 1419 1420 if (cpuid > NR_CPUS) 1421 prom_printf("WARNING: maximum CPUs (" __stringify(NR_CPUS) 1422 ") exceeded: ignoring extras\n"); 1423 1424 prom_debug("prom_hold_cpus: end...\n"); 1425 } 1426 1427 1428 static void __init prom_init_client_services(unsigned long pp) 1429 { 1430 struct prom_t *_prom = &RELOC(prom); 1431 1432 /* Get a handle to the prom entry point before anything else */ 1433 RELOC(prom_entry) = pp; 1434 1435 /* get a handle for the stdout device */ 1436 _prom->chosen = call_prom("finddevice", 1, 1, ADDR("/chosen")); 1437 if (!PHANDLE_VALID(_prom->chosen)) 1438 prom_panic("cannot find chosen"); /* msg won't be printed :( */ 1439 1440 /* get device tree root */ 1441 _prom->root = call_prom("finddevice", 1, 1, ADDR("/")); 1442 if (!PHANDLE_VALID(_prom->root)) 1443 prom_panic("cannot find device tree root"); /* msg won't be printed :( */ 1444 1445 _prom->mmumap = 0; 1446 } 1447 1448 #ifdef CONFIG_PPC32 1449 /* 1450 * For really old powermacs, we need to map things we claim. 1451 * For that, we need the ihandle of the mmu. 1452 * Also, on the longtrail, we need to work around other bugs. 1453 */ 1454 static void __init prom_find_mmu(void) 1455 { 1456 struct prom_t *_prom = &RELOC(prom); 1457 phandle oprom; 1458 char version[64]; 1459 1460 oprom = call_prom("finddevice", 1, 1, ADDR("/openprom")); 1461 if (!PHANDLE_VALID(oprom)) 1462 return; 1463 if (prom_getprop(oprom, "model", version, sizeof(version)) <= 0) 1464 return; 1465 version[sizeof(version) - 1] = 0; 1466 /* XXX might need to add other versions here */ 1467 if (strcmp(version, "Open Firmware, 1.0.5") == 0) 1468 of_workarounds = OF_WA_CLAIM; 1469 else if (strncmp(version, "FirmWorks,3.", 12) == 0) { 1470 of_workarounds = OF_WA_CLAIM | OF_WA_LONGTRAIL; 1471 call_prom("interpret", 1, 1, "dev /memory 0 to allow-reclaim"); 1472 } else 1473 return; 1474 _prom->memory = call_prom("open", 1, 1, ADDR("/memory")); 1475 prom_getprop(_prom->chosen, "mmu", &_prom->mmumap, 1476 sizeof(_prom->mmumap)); 1477 if (!IHANDLE_VALID(_prom->memory) || !IHANDLE_VALID(_prom->mmumap)) 1478 of_workarounds &= ~OF_WA_CLAIM; /* hmmm */ 1479 } 1480 #else 1481 #define prom_find_mmu() 1482 #endif 1483 1484 static void __init prom_init_stdout(void) 1485 { 1486 struct prom_t *_prom = &RELOC(prom); 1487 char *path = RELOC(of_stdout_device); 1488 char type[16]; 1489 u32 val; 1490 1491 if (prom_getprop(_prom->chosen, "stdout", &val, sizeof(val)) <= 0) 1492 prom_panic("cannot find stdout"); 1493 1494 _prom->stdout = val; 1495 1496 /* Get the full OF pathname of the stdout device */ 1497 memset(path, 0, 256); 1498 call_prom("instance-to-path", 3, 1, _prom->stdout, path, 255); 1499 val = call_prom("instance-to-package", 1, 1, _prom->stdout); 1500 prom_setprop(_prom->chosen, "/chosen", "linux,stdout-package", 1501 &val, sizeof(val)); 1502 prom_printf("OF stdout device is: %s\n", RELOC(of_stdout_device)); 1503 prom_setprop(_prom->chosen, "/chosen", "linux,stdout-path", 1504 path, strlen(path) + 1); 1505 1506 /* If it's a display, note it */ 1507 memset(type, 0, sizeof(type)); 1508 prom_getprop(val, "device_type", type, sizeof(type)); 1509 if (strcmp(type, RELOC("display")) == 0) 1510 prom_setprop(val, path, "linux,boot-display", NULL, 0); 1511 } 1512 1513 static void __init prom_close_stdin(void) 1514 { 1515 struct prom_t *_prom = &RELOC(prom); 1516 ihandle val; 1517 1518 if (prom_getprop(_prom->chosen, "stdin", &val, sizeof(val)) > 0) 1519 call_prom("close", 1, 0, val); 1520 } 1521 1522 static int __init prom_find_machine_type(void) 1523 { 1524 struct prom_t *_prom = &RELOC(prom); 1525 char compat[256]; 1526 int len, i = 0; 1527 #ifdef CONFIG_PPC64 1528 phandle rtas; 1529 int x; 1530 #endif 1531 1532 /* Look for a PowerMac */ 1533 len = prom_getprop(_prom->root, "compatible", 1534 compat, sizeof(compat)-1); 1535 if (len > 0) { 1536 compat[len] = 0; 1537 while (i < len) { 1538 char *p = &compat[i]; 1539 int sl = strlen(p); 1540 if (sl == 0) 1541 break; 1542 if (strstr(p, RELOC("Power Macintosh")) || 1543 strstr(p, RELOC("MacRISC"))) 1544 return PLATFORM_POWERMAC; 1545 #ifdef CONFIG_PPC64 1546 /* We must make sure we don't detect the IBM Cell 1547 * blades as pSeries due to some firmware issues, 1548 * so we do it here. 1549 */ 1550 if (strstr(p, RELOC("IBM,CBEA")) || 1551 strstr(p, RELOC("IBM,CPBW-1.0"))) 1552 return PLATFORM_GENERIC; 1553 #endif /* CONFIG_PPC64 */ 1554 i += sl + 1; 1555 } 1556 } 1557 #ifdef CONFIG_PPC64 1558 /* If not a mac, try to figure out if it's an IBM pSeries or any other 1559 * PAPR compliant platform. We assume it is if : 1560 * - /device_type is "chrp" (please, do NOT use that for future 1561 * non-IBM designs ! 1562 * - it has /rtas 1563 */ 1564 len = prom_getprop(_prom->root, "device_type", 1565 compat, sizeof(compat)-1); 1566 if (len <= 0) 1567 return PLATFORM_GENERIC; 1568 if (strcmp(compat, RELOC("chrp"))) 1569 return PLATFORM_GENERIC; 1570 1571 /* Default to pSeries. We need to know if we are running LPAR */ 1572 rtas = call_prom("finddevice", 1, 1, ADDR("/rtas")); 1573 if (!PHANDLE_VALID(rtas)) 1574 return PLATFORM_GENERIC; 1575 x = prom_getproplen(rtas, "ibm,hypertas-functions"); 1576 if (x != PROM_ERROR) { 1577 prom_printf("Hypertas detected, assuming LPAR !\n"); 1578 return PLATFORM_PSERIES_LPAR; 1579 } 1580 return PLATFORM_PSERIES; 1581 #else 1582 return PLATFORM_GENERIC; 1583 #endif 1584 } 1585 1586 static int __init prom_set_color(ihandle ih, int i, int r, int g, int b) 1587 { 1588 return call_prom("call-method", 6, 1, ADDR("color!"), ih, i, b, g, r); 1589 } 1590 1591 /* 1592 * If we have a display that we don't know how to drive, 1593 * we will want to try to execute OF's open method for it 1594 * later. However, OF will probably fall over if we do that 1595 * we've taken over the MMU. 1596 * So we check whether we will need to open the display, 1597 * and if so, open it now. 1598 */ 1599 static void __init prom_check_displays(void) 1600 { 1601 char type[16], *path; 1602 phandle node; 1603 ihandle ih; 1604 int i; 1605 1606 static unsigned char default_colors[] = { 1607 0x00, 0x00, 0x00, 1608 0x00, 0x00, 0xaa, 1609 0x00, 0xaa, 0x00, 1610 0x00, 0xaa, 0xaa, 1611 0xaa, 0x00, 0x00, 1612 0xaa, 0x00, 0xaa, 1613 0xaa, 0xaa, 0x00, 1614 0xaa, 0xaa, 0xaa, 1615 0x55, 0x55, 0x55, 1616 0x55, 0x55, 0xff, 1617 0x55, 0xff, 0x55, 1618 0x55, 0xff, 0xff, 1619 0xff, 0x55, 0x55, 1620 0xff, 0x55, 0xff, 1621 0xff, 0xff, 0x55, 1622 0xff, 0xff, 0xff 1623 }; 1624 const unsigned char *clut; 1625 1626 prom_printf("Looking for displays\n"); 1627 for (node = 0; prom_next_node(&node); ) { 1628 memset(type, 0, sizeof(type)); 1629 prom_getprop(node, "device_type", type, sizeof(type)); 1630 if (strcmp(type, RELOC("display")) != 0) 1631 continue; 1632 1633 /* It seems OF doesn't null-terminate the path :-( */ 1634 path = RELOC(prom_scratch); 1635 memset(path, 0, PROM_SCRATCH_SIZE); 1636 1637 /* 1638 * leave some room at the end of the path for appending extra 1639 * arguments 1640 */ 1641 if (call_prom("package-to-path", 3, 1, node, path, 1642 PROM_SCRATCH_SIZE-10) == PROM_ERROR) 1643 continue; 1644 prom_printf("found display : %s, opening ... ", path); 1645 1646 ih = call_prom("open", 1, 1, path); 1647 if (ih == 0) { 1648 prom_printf("failed\n"); 1649 continue; 1650 } 1651 1652 /* Success */ 1653 prom_printf("done\n"); 1654 prom_setprop(node, path, "linux,opened", NULL, 0); 1655 1656 /* Setup a usable color table when the appropriate 1657 * method is available. Should update this to set-colors */ 1658 clut = RELOC(default_colors); 1659 for (i = 0; i < 32; i++, clut += 3) 1660 if (prom_set_color(ih, i, clut[0], clut[1], 1661 clut[2]) != 0) 1662 break; 1663 1664 #ifdef CONFIG_LOGO_LINUX_CLUT224 1665 clut = PTRRELOC(RELOC(logo_linux_clut224.clut)); 1666 for (i = 0; i < RELOC(logo_linux_clut224.clutsize); i++, clut += 3) 1667 if (prom_set_color(ih, i + 32, clut[0], clut[1], 1668 clut[2]) != 0) 1669 break; 1670 #endif /* CONFIG_LOGO_LINUX_CLUT224 */ 1671 } 1672 } 1673 1674 1675 /* Return (relocated) pointer to this much memory: moves initrd if reqd. */ 1676 static void __init *make_room(unsigned long *mem_start, unsigned long *mem_end, 1677 unsigned long needed, unsigned long align) 1678 { 1679 void *ret; 1680 1681 *mem_start = _ALIGN(*mem_start, align); 1682 while ((*mem_start + needed) > *mem_end) { 1683 unsigned long room, chunk; 1684 1685 prom_debug("Chunk exhausted, claiming more at %x...\n", 1686 RELOC(alloc_bottom)); 1687 room = RELOC(alloc_top) - RELOC(alloc_bottom); 1688 if (room > DEVTREE_CHUNK_SIZE) 1689 room = DEVTREE_CHUNK_SIZE; 1690 if (room < PAGE_SIZE) 1691 prom_panic("No memory for flatten_device_tree (no room)"); 1692 chunk = alloc_up(room, 0); 1693 if (chunk == 0) 1694 prom_panic("No memory for flatten_device_tree (claim failed)"); 1695 *mem_end = RELOC(alloc_top); 1696 } 1697 1698 ret = (void *)*mem_start; 1699 *mem_start += needed; 1700 1701 return ret; 1702 } 1703 1704 #define dt_push_token(token, mem_start, mem_end) \ 1705 do { *((u32 *)make_room(mem_start, mem_end, 4, 4)) = token; } while(0) 1706 1707 static unsigned long __init dt_find_string(char *str) 1708 { 1709 char *s, *os; 1710 1711 s = os = (char *)RELOC(dt_string_start); 1712 s += 4; 1713 while (s < (char *)RELOC(dt_string_end)) { 1714 if (strcmp(s, str) == 0) 1715 return s - os; 1716 s += strlen(s) + 1; 1717 } 1718 return 0; 1719 } 1720 1721 /* 1722 * The Open Firmware 1275 specification states properties must be 31 bytes or 1723 * less, however not all firmwares obey this. Make it 64 bytes to be safe. 1724 */ 1725 #define MAX_PROPERTY_NAME 64 1726 1727 static void __init scan_dt_build_strings(phandle node, 1728 unsigned long *mem_start, 1729 unsigned long *mem_end) 1730 { 1731 char *prev_name, *namep, *sstart; 1732 unsigned long soff; 1733 phandle child; 1734 1735 sstart = (char *)RELOC(dt_string_start); 1736 1737 /* get and store all property names */ 1738 prev_name = RELOC(""); 1739 for (;;) { 1740 /* 64 is max len of name including nul. */ 1741 namep = make_room(mem_start, mem_end, MAX_PROPERTY_NAME, 1); 1742 if (call_prom("nextprop", 3, 1, node, prev_name, namep) != 1) { 1743 /* No more nodes: unwind alloc */ 1744 *mem_start = (unsigned long)namep; 1745 break; 1746 } 1747 1748 /* skip "name" */ 1749 if (strcmp(namep, RELOC("name")) == 0) { 1750 *mem_start = (unsigned long)namep; 1751 prev_name = RELOC("name"); 1752 continue; 1753 } 1754 /* get/create string entry */ 1755 soff = dt_find_string(namep); 1756 if (soff != 0) { 1757 *mem_start = (unsigned long)namep; 1758 namep = sstart + soff; 1759 } else { 1760 /* Trim off some if we can */ 1761 *mem_start = (unsigned long)namep + strlen(namep) + 1; 1762 RELOC(dt_string_end) = *mem_start; 1763 } 1764 prev_name = namep; 1765 } 1766 1767 /* do all our children */ 1768 child = call_prom("child", 1, 1, node); 1769 while (child != 0) { 1770 scan_dt_build_strings(child, mem_start, mem_end); 1771 child = call_prom("peer", 1, 1, child); 1772 } 1773 } 1774 1775 static void __init scan_dt_build_struct(phandle node, unsigned long *mem_start, 1776 unsigned long *mem_end) 1777 { 1778 phandle child; 1779 char *namep, *prev_name, *sstart, *p, *ep, *lp, *path; 1780 unsigned long soff; 1781 unsigned char *valp; 1782 static char pname[MAX_PROPERTY_NAME]; 1783 int l, room; 1784 1785 dt_push_token(OF_DT_BEGIN_NODE, mem_start, mem_end); 1786 1787 /* get the node's full name */ 1788 namep = (char *)*mem_start; 1789 room = *mem_end - *mem_start; 1790 if (room > 255) 1791 room = 255; 1792 l = call_prom("package-to-path", 3, 1, node, namep, room); 1793 if (l >= 0) { 1794 /* Didn't fit? Get more room. */ 1795 if (l >= room) { 1796 if (l >= *mem_end - *mem_start) 1797 namep = make_room(mem_start, mem_end, l+1, 1); 1798 call_prom("package-to-path", 3, 1, node, namep, l); 1799 } 1800 namep[l] = '\0'; 1801 1802 /* Fixup an Apple bug where they have bogus \0 chars in the 1803 * middle of the path in some properties, and extract 1804 * the unit name (everything after the last '/'). 1805 */ 1806 for (lp = p = namep, ep = namep + l; p < ep; p++) { 1807 if (*p == '/') 1808 lp = namep; 1809 else if (*p != 0) 1810 *lp++ = *p; 1811 } 1812 *lp = 0; 1813 *mem_start = _ALIGN((unsigned long)lp + 1, 4); 1814 } 1815 1816 /* get it again for debugging */ 1817 path = RELOC(prom_scratch); 1818 memset(path, 0, PROM_SCRATCH_SIZE); 1819 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1); 1820 1821 /* get and store all properties */ 1822 prev_name = RELOC(""); 1823 sstart = (char *)RELOC(dt_string_start); 1824 for (;;) { 1825 if (call_prom("nextprop", 3, 1, node, prev_name, 1826 RELOC(pname)) != 1) 1827 break; 1828 1829 /* skip "name" */ 1830 if (strcmp(RELOC(pname), RELOC("name")) == 0) { 1831 prev_name = RELOC("name"); 1832 continue; 1833 } 1834 1835 /* find string offset */ 1836 soff = dt_find_string(RELOC(pname)); 1837 if (soff == 0) { 1838 prom_printf("WARNING: Can't find string index for" 1839 " <%s>, node %s\n", RELOC(pname), path); 1840 break; 1841 } 1842 prev_name = sstart + soff; 1843 1844 /* get length */ 1845 l = call_prom("getproplen", 2, 1, node, RELOC(pname)); 1846 1847 /* sanity checks */ 1848 if (l == PROM_ERROR) 1849 continue; 1850 if (l > MAX_PROPERTY_LENGTH) { 1851 prom_printf("WARNING: ignoring large property "); 1852 /* It seems OF doesn't null-terminate the path :-( */ 1853 prom_printf("[%s] ", path); 1854 prom_printf("%s length 0x%x\n", RELOC(pname), l); 1855 continue; 1856 } 1857 1858 /* push property head */ 1859 dt_push_token(OF_DT_PROP, mem_start, mem_end); 1860 dt_push_token(l, mem_start, mem_end); 1861 dt_push_token(soff, mem_start, mem_end); 1862 1863 /* push property content */ 1864 valp = make_room(mem_start, mem_end, l, 4); 1865 call_prom("getprop", 4, 1, node, RELOC(pname), valp, l); 1866 *mem_start = _ALIGN(*mem_start, 4); 1867 } 1868 1869 /* Add a "linux,phandle" property. */ 1870 soff = dt_find_string(RELOC("linux,phandle")); 1871 if (soff == 0) 1872 prom_printf("WARNING: Can't find string index for" 1873 " <linux-phandle> node %s\n", path); 1874 else { 1875 dt_push_token(OF_DT_PROP, mem_start, mem_end); 1876 dt_push_token(4, mem_start, mem_end); 1877 dt_push_token(soff, mem_start, mem_end); 1878 valp = make_room(mem_start, mem_end, 4, 4); 1879 *(u32 *)valp = node; 1880 } 1881 1882 /* do all our children */ 1883 child = call_prom("child", 1, 1, node); 1884 while (child != 0) { 1885 scan_dt_build_struct(child, mem_start, mem_end); 1886 child = call_prom("peer", 1, 1, child); 1887 } 1888 1889 dt_push_token(OF_DT_END_NODE, mem_start, mem_end); 1890 } 1891 1892 static void __init flatten_device_tree(void) 1893 { 1894 phandle root; 1895 unsigned long mem_start, mem_end, room; 1896 struct boot_param_header *hdr; 1897 struct prom_t *_prom = &RELOC(prom); 1898 char *namep; 1899 u64 *rsvmap; 1900 1901 /* 1902 * Check how much room we have between alloc top & bottom (+/- a 1903 * few pages), crop to 4Mb, as this is our "chuck" size 1904 */ 1905 room = RELOC(alloc_top) - RELOC(alloc_bottom) - 0x4000; 1906 if (room > DEVTREE_CHUNK_SIZE) 1907 room = DEVTREE_CHUNK_SIZE; 1908 prom_debug("starting device tree allocs at %x\n", RELOC(alloc_bottom)); 1909 1910 /* Now try to claim that */ 1911 mem_start = (unsigned long)alloc_up(room, PAGE_SIZE); 1912 if (mem_start == 0) 1913 prom_panic("Can't allocate initial device-tree chunk\n"); 1914 mem_end = RELOC(alloc_top); 1915 1916 /* Get root of tree */ 1917 root = call_prom("peer", 1, 1, (phandle)0); 1918 if (root == (phandle)0) 1919 prom_panic ("couldn't get device tree root\n"); 1920 1921 /* Build header and make room for mem rsv map */ 1922 mem_start = _ALIGN(mem_start, 4); 1923 hdr = make_room(&mem_start, &mem_end, 1924 sizeof(struct boot_param_header), 4); 1925 RELOC(dt_header_start) = (unsigned long)hdr; 1926 rsvmap = make_room(&mem_start, &mem_end, sizeof(mem_reserve_map), 8); 1927 1928 /* Start of strings */ 1929 mem_start = PAGE_ALIGN(mem_start); 1930 RELOC(dt_string_start) = mem_start; 1931 mem_start += 4; /* hole */ 1932 1933 /* Add "linux,phandle" in there, we'll need it */ 1934 namep = make_room(&mem_start, &mem_end, 16, 1); 1935 strcpy(namep, RELOC("linux,phandle")); 1936 mem_start = (unsigned long)namep + strlen(namep) + 1; 1937 1938 /* Build string array */ 1939 prom_printf("Building dt strings...\n"); 1940 scan_dt_build_strings(root, &mem_start, &mem_end); 1941 RELOC(dt_string_end) = mem_start; 1942 1943 /* Build structure */ 1944 mem_start = PAGE_ALIGN(mem_start); 1945 RELOC(dt_struct_start) = mem_start; 1946 prom_printf("Building dt structure...\n"); 1947 scan_dt_build_struct(root, &mem_start, &mem_end); 1948 dt_push_token(OF_DT_END, &mem_start, &mem_end); 1949 RELOC(dt_struct_end) = PAGE_ALIGN(mem_start); 1950 1951 /* Finish header */ 1952 hdr->boot_cpuid_phys = _prom->cpu; 1953 hdr->magic = OF_DT_HEADER; 1954 hdr->totalsize = RELOC(dt_struct_end) - RELOC(dt_header_start); 1955 hdr->off_dt_struct = RELOC(dt_struct_start) - RELOC(dt_header_start); 1956 hdr->off_dt_strings = RELOC(dt_string_start) - RELOC(dt_header_start); 1957 hdr->dt_strings_size = RELOC(dt_string_end) - RELOC(dt_string_start); 1958 hdr->off_mem_rsvmap = ((unsigned long)rsvmap) - RELOC(dt_header_start); 1959 hdr->version = OF_DT_VERSION; 1960 /* Version 16 is not backward compatible */ 1961 hdr->last_comp_version = 0x10; 1962 1963 /* Copy the reserve map in */ 1964 memcpy(rsvmap, RELOC(mem_reserve_map), sizeof(mem_reserve_map)); 1965 1966 #ifdef DEBUG_PROM 1967 { 1968 int i; 1969 prom_printf("reserved memory map:\n"); 1970 for (i = 0; i < RELOC(mem_reserve_cnt); i++) 1971 prom_printf(" %x - %x\n", 1972 RELOC(mem_reserve_map)[i].base, 1973 RELOC(mem_reserve_map)[i].size); 1974 } 1975 #endif 1976 /* Bump mem_reserve_cnt to cause further reservations to fail 1977 * since it's too late. 1978 */ 1979 RELOC(mem_reserve_cnt) = MEM_RESERVE_MAP_SIZE; 1980 1981 prom_printf("Device tree strings 0x%x -> 0x%x\n", 1982 RELOC(dt_string_start), RELOC(dt_string_end)); 1983 prom_printf("Device tree struct 0x%x -> 0x%x\n", 1984 RELOC(dt_struct_start), RELOC(dt_struct_end)); 1985 1986 } 1987 1988 #ifdef CONFIG_PPC_MAPLE 1989 /* PIBS Version 1.05.0000 04/26/2005 has an incorrect /ht/isa/ranges property. 1990 * The values are bad, and it doesn't even have the right number of cells. */ 1991 static void __init fixup_device_tree_maple(void) 1992 { 1993 phandle isa; 1994 u32 isa_ranges[6]; 1995 1996 isa = call_prom("finddevice", 1, 1, ADDR("/ht@0/isa@4")); 1997 if (!PHANDLE_VALID(isa)) 1998 return; 1999 2000 if (prom_getprop(isa, "ranges", isa_ranges, sizeof(isa_ranges)) 2001 == PROM_ERROR) 2002 return; 2003 2004 if (isa_ranges[0] != 0x1 || 2005 isa_ranges[1] != 0xf4000000 || 2006 isa_ranges[2] != 0x00010000) 2007 return; 2008 2009 prom_printf("fixing up bogus ISA range on Maple...\n"); 2010 2011 isa_ranges[0] = 0x1; 2012 isa_ranges[1] = 0x0; 2013 isa_ranges[2] = 0x01002000; /* IO space; PCI device = 4 */ 2014 isa_ranges[3] = 0x0; 2015 isa_ranges[4] = 0x0; 2016 isa_ranges[5] = 0x00010000; 2017 prom_setprop(isa, "/ht@0/isa@4", "ranges", 2018 isa_ranges, sizeof(isa_ranges)); 2019 } 2020 #else 2021 #define fixup_device_tree_maple() 2022 #endif 2023 2024 #if defined(CONFIG_PPC64) && defined(CONFIG_PPC_PMAC) 2025 static void __init fixup_device_tree_pmac(void) 2026 { 2027 phandle u3, i2c, mpic; 2028 u32 u3_rev; 2029 u32 interrupts[2]; 2030 u32 parent; 2031 2032 /* Some G5s have a missing interrupt definition, fix it up here */ 2033 u3 = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000")); 2034 if (!PHANDLE_VALID(u3)) 2035 return; 2036 i2c = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/i2c@f8001000")); 2037 if (!PHANDLE_VALID(i2c)) 2038 return; 2039 mpic = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/mpic@f8040000")); 2040 if (!PHANDLE_VALID(mpic)) 2041 return; 2042 2043 /* check if proper rev of u3 */ 2044 if (prom_getprop(u3, "device-rev", &u3_rev, sizeof(u3_rev)) 2045 == PROM_ERROR) 2046 return; 2047 if (u3_rev < 0x35 || u3_rev > 0x39) 2048 return; 2049 /* does it need fixup ? */ 2050 if (prom_getproplen(i2c, "interrupts") > 0) 2051 return; 2052 2053 prom_printf("fixing up bogus interrupts for u3 i2c...\n"); 2054 2055 /* interrupt on this revision of u3 is number 0 and level */ 2056 interrupts[0] = 0; 2057 interrupts[1] = 1; 2058 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupts", 2059 &interrupts, sizeof(interrupts)); 2060 parent = (u32)mpic; 2061 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupt-parent", 2062 &parent, sizeof(parent)); 2063 } 2064 #else 2065 #define fixup_device_tree_pmac() 2066 #endif 2067 2068 static void __init fixup_device_tree(void) 2069 { 2070 fixup_device_tree_maple(); 2071 fixup_device_tree_pmac(); 2072 } 2073 2074 static void __init prom_find_boot_cpu(void) 2075 { 2076 struct prom_t *_prom = &RELOC(prom); 2077 u32 getprop_rval; 2078 ihandle prom_cpu; 2079 phandle cpu_pkg; 2080 2081 _prom->cpu = 0; 2082 if (prom_getprop(_prom->chosen, "cpu", &prom_cpu, sizeof(prom_cpu)) <= 0) 2083 return; 2084 2085 cpu_pkg = call_prom("instance-to-package", 1, 1, prom_cpu); 2086 2087 prom_getprop(cpu_pkg, "reg", &getprop_rval, sizeof(getprop_rval)); 2088 _prom->cpu = getprop_rval; 2089 2090 prom_debug("Booting CPU hw index = 0x%x\n", _prom->cpu); 2091 } 2092 2093 static void __init prom_check_initrd(unsigned long r3, unsigned long r4) 2094 { 2095 #ifdef CONFIG_BLK_DEV_INITRD 2096 struct prom_t *_prom = &RELOC(prom); 2097 2098 if (r3 && r4 && r4 != 0xdeadbeef) { 2099 unsigned long val; 2100 2101 RELOC(prom_initrd_start) = is_kernel_addr(r3) ? __pa(r3) : r3; 2102 RELOC(prom_initrd_end) = RELOC(prom_initrd_start) + r4; 2103 2104 val = RELOC(prom_initrd_start); 2105 prom_setprop(_prom->chosen, "/chosen", "linux,initrd-start", 2106 &val, sizeof(val)); 2107 val = RELOC(prom_initrd_end); 2108 prom_setprop(_prom->chosen, "/chosen", "linux,initrd-end", 2109 &val, sizeof(val)); 2110 2111 reserve_mem(RELOC(prom_initrd_start), 2112 RELOC(prom_initrd_end) - RELOC(prom_initrd_start)); 2113 2114 prom_debug("initrd_start=0x%x\n", RELOC(prom_initrd_start)); 2115 prom_debug("initrd_end=0x%x\n", RELOC(prom_initrd_end)); 2116 } 2117 #endif /* CONFIG_BLK_DEV_INITRD */ 2118 } 2119 2120 /* 2121 * We enter here early on, when the Open Firmware prom is still 2122 * handling exceptions and the MMU hash table for us. 2123 */ 2124 2125 unsigned long __init prom_init(unsigned long r3, unsigned long r4, 2126 unsigned long pp, 2127 unsigned long r6, unsigned long r7) 2128 { 2129 struct prom_t *_prom; 2130 unsigned long hdr; 2131 unsigned long offset = reloc_offset(); 2132 2133 #ifdef CONFIG_PPC32 2134 reloc_got2(offset); 2135 #endif 2136 2137 _prom = &RELOC(prom); 2138 2139 /* 2140 * First zero the BSS 2141 */ 2142 memset(&RELOC(__bss_start), 0, __bss_stop - __bss_start); 2143 2144 /* 2145 * Init interface to Open Firmware, get some node references, 2146 * like /chosen 2147 */ 2148 prom_init_client_services(pp); 2149 2150 /* 2151 * See if this OF is old enough that we need to do explicit maps 2152 * and other workarounds 2153 */ 2154 prom_find_mmu(); 2155 2156 /* 2157 * Init prom stdout device 2158 */ 2159 prom_init_stdout(); 2160 2161 /* 2162 * Get default machine type. At this point, we do not differentiate 2163 * between pSeries SMP and pSeries LPAR 2164 */ 2165 RELOC(of_platform) = prom_find_machine_type(); 2166 2167 /* Bail if this is a kdump kernel. */ 2168 if (PHYSICAL_START > 0) 2169 prom_panic("Error: You can't boot a kdump kernel from OF!\n"); 2170 2171 /* 2172 * Check for an initrd 2173 */ 2174 prom_check_initrd(r3, r4); 2175 2176 #ifdef CONFIG_PPC_PSERIES 2177 /* 2178 * On pSeries, inform the firmware about our capabilities 2179 */ 2180 if (RELOC(of_platform) == PLATFORM_PSERIES || 2181 RELOC(of_platform) == PLATFORM_PSERIES_LPAR) 2182 prom_send_capabilities(); 2183 #endif 2184 2185 /* 2186 * Copy the CPU hold code 2187 */ 2188 if (RELOC(of_platform) != PLATFORM_POWERMAC) 2189 copy_and_flush(0, KERNELBASE + offset, 0x100, 0); 2190 2191 /* 2192 * Do early parsing of command line 2193 */ 2194 early_cmdline_parse(); 2195 2196 /* 2197 * Initialize memory management within prom_init 2198 */ 2199 prom_init_mem(); 2200 2201 /* 2202 * Determine which cpu is actually running right _now_ 2203 */ 2204 prom_find_boot_cpu(); 2205 2206 /* 2207 * Initialize display devices 2208 */ 2209 prom_check_displays(); 2210 2211 #ifdef CONFIG_PPC64 2212 /* 2213 * Initialize IOMMU (TCE tables) on pSeries. Do that before anything else 2214 * that uses the allocator, we need to make sure we get the top of memory 2215 * available for us here... 2216 */ 2217 if (RELOC(of_platform) == PLATFORM_PSERIES) 2218 prom_initialize_tce_table(); 2219 #endif 2220 2221 /* 2222 * On non-powermacs, try to instantiate RTAS and puts all CPUs 2223 * in spin-loops. PowerMacs don't have a working RTAS and use 2224 * a different way to spin CPUs 2225 */ 2226 if (RELOC(of_platform) != PLATFORM_POWERMAC) { 2227 prom_instantiate_rtas(); 2228 prom_hold_cpus(); 2229 } 2230 2231 /* 2232 * Fill in some infos for use by the kernel later on 2233 */ 2234 #ifdef CONFIG_PPC64 2235 if (RELOC(ppc64_iommu_off)) 2236 prom_setprop(_prom->chosen, "/chosen", "linux,iommu-off", 2237 NULL, 0); 2238 2239 if (RELOC(iommu_force_on)) 2240 prom_setprop(_prom->chosen, "/chosen", "linux,iommu-force-on", 2241 NULL, 0); 2242 2243 if (RELOC(prom_tce_alloc_start)) { 2244 prom_setprop(_prom->chosen, "/chosen", "linux,tce-alloc-start", 2245 &RELOC(prom_tce_alloc_start), 2246 sizeof(prom_tce_alloc_start)); 2247 prom_setprop(_prom->chosen, "/chosen", "linux,tce-alloc-end", 2248 &RELOC(prom_tce_alloc_end), 2249 sizeof(prom_tce_alloc_end)); 2250 } 2251 #endif 2252 2253 /* 2254 * Fixup any known bugs in the device-tree 2255 */ 2256 fixup_device_tree(); 2257 2258 /* 2259 * Now finally create the flattened device-tree 2260 */ 2261 prom_printf("copying OF device tree ...\n"); 2262 flatten_device_tree(); 2263 2264 /* 2265 * in case stdin is USB and still active on IBM machines... 2266 * Unfortunately quiesce crashes on some powermacs if we have 2267 * closed stdin already (in particular the powerbook 101). 2268 */ 2269 if (RELOC(of_platform) != PLATFORM_POWERMAC) 2270 prom_close_stdin(); 2271 2272 /* 2273 * Call OF "quiesce" method to shut down pending DMA's from 2274 * devices etc... 2275 */ 2276 prom_printf("Calling quiesce ...\n"); 2277 call_prom("quiesce", 0, 0); 2278 2279 /* 2280 * And finally, call the kernel passing it the flattened device 2281 * tree and NULL as r5, thus triggering the new entry point which 2282 * is common to us and kexec 2283 */ 2284 hdr = RELOC(dt_header_start); 2285 prom_printf("returning from prom_init\n"); 2286 prom_debug("->dt_header_start=0x%x\n", hdr); 2287 2288 #ifdef CONFIG_PPC32 2289 reloc_got2(-offset); 2290 #endif 2291 2292 __start(hdr, KERNELBASE + offset, 0); 2293 2294 return 0; 2295 } 2296