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