1 /* 2 * linux/arch/arm/kernel/setup.c 3 * 4 * Copyright (C) 1995-2001 Russell King 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 */ 10 #include <linux/module.h> 11 #include <linux/kernel.h> 12 #include <linux/stddef.h> 13 #include <linux/ioport.h> 14 #include <linux/delay.h> 15 #include <linux/utsname.h> 16 #include <linux/initrd.h> 17 #include <linux/console.h> 18 #include <linux/bootmem.h> 19 #include <linux/seq_file.h> 20 #include <linux/screen_info.h> 21 #include <linux/init.h> 22 #include <linux/root_dev.h> 23 #include <linux/cpu.h> 24 #include <linux/interrupt.h> 25 #include <linux/smp.h> 26 27 #include <asm/cpu.h> 28 #include <asm/elf.h> 29 #include <asm/procinfo.h> 30 #include <asm/setup.h> 31 #include <asm/mach-types.h> 32 #include <asm/cacheflush.h> 33 #include <asm/tlbflush.h> 34 35 #include <asm/mach/arch.h> 36 #include <asm/mach/irq.h> 37 #include <asm/mach/time.h> 38 39 #include "compat.h" 40 41 #ifndef MEM_SIZE 42 #define MEM_SIZE (16*1024*1024) 43 #endif 44 45 #if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE) 46 char fpe_type[8]; 47 48 static int __init fpe_setup(char *line) 49 { 50 memcpy(fpe_type, line, 8); 51 return 1; 52 } 53 54 __setup("fpe=", fpe_setup); 55 #endif 56 57 extern void paging_init(struct meminfo *, struct machine_desc *desc); 58 extern void reboot_setup(char *str); 59 extern int root_mountflags; 60 extern void _stext, _text, _etext, __data_start, _edata, _end; 61 62 unsigned int processor_id; 63 unsigned int __machine_arch_type; 64 EXPORT_SYMBOL(__machine_arch_type); 65 66 unsigned int system_rev; 67 EXPORT_SYMBOL(system_rev); 68 69 unsigned int system_serial_low; 70 EXPORT_SYMBOL(system_serial_low); 71 72 unsigned int system_serial_high; 73 EXPORT_SYMBOL(system_serial_high); 74 75 unsigned int elf_hwcap; 76 EXPORT_SYMBOL(elf_hwcap); 77 78 79 #ifdef MULTI_CPU 80 struct processor processor; 81 #endif 82 #ifdef MULTI_TLB 83 struct cpu_tlb_fns cpu_tlb; 84 #endif 85 #ifdef MULTI_USER 86 struct cpu_user_fns cpu_user; 87 #endif 88 #ifdef MULTI_CACHE 89 struct cpu_cache_fns cpu_cache; 90 #endif 91 92 struct stack { 93 u32 irq[3]; 94 u32 abt[3]; 95 u32 und[3]; 96 } ____cacheline_aligned; 97 98 static struct stack stacks[NR_CPUS]; 99 100 char elf_platform[ELF_PLATFORM_SIZE]; 101 EXPORT_SYMBOL(elf_platform); 102 103 unsigned long phys_initrd_start __initdata = 0; 104 unsigned long phys_initrd_size __initdata = 0; 105 106 static struct meminfo meminfo __initdata = { 0, }; 107 static const char *cpu_name; 108 static const char *machine_name; 109 static char command_line[COMMAND_LINE_SIZE]; 110 111 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE; 112 static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } }; 113 #define ENDIANNESS ((char)endian_test.l) 114 115 DEFINE_PER_CPU(struct cpuinfo_arm, cpu_data); 116 117 /* 118 * Standard memory resources 119 */ 120 static struct resource mem_res[] = { 121 { 122 .name = "Video RAM", 123 .start = 0, 124 .end = 0, 125 .flags = IORESOURCE_MEM 126 }, 127 { 128 .name = "Kernel text", 129 .start = 0, 130 .end = 0, 131 .flags = IORESOURCE_MEM 132 }, 133 { 134 .name = "Kernel data", 135 .start = 0, 136 .end = 0, 137 .flags = IORESOURCE_MEM 138 } 139 }; 140 141 #define video_ram mem_res[0] 142 #define kernel_code mem_res[1] 143 #define kernel_data mem_res[2] 144 145 static struct resource io_res[] = { 146 { 147 .name = "reserved", 148 .start = 0x3bc, 149 .end = 0x3be, 150 .flags = IORESOURCE_IO | IORESOURCE_BUSY 151 }, 152 { 153 .name = "reserved", 154 .start = 0x378, 155 .end = 0x37f, 156 .flags = IORESOURCE_IO | IORESOURCE_BUSY 157 }, 158 { 159 .name = "reserved", 160 .start = 0x278, 161 .end = 0x27f, 162 .flags = IORESOURCE_IO | IORESOURCE_BUSY 163 } 164 }; 165 166 #define lp0 io_res[0] 167 #define lp1 io_res[1] 168 #define lp2 io_res[2] 169 170 static const char *cache_types[16] = { 171 "write-through", 172 "write-back", 173 "write-back", 174 "undefined 3", 175 "undefined 4", 176 "undefined 5", 177 "write-back", 178 "write-back", 179 "undefined 8", 180 "undefined 9", 181 "undefined 10", 182 "undefined 11", 183 "undefined 12", 184 "undefined 13", 185 "write-back", 186 "undefined 15", 187 }; 188 189 static const char *cache_clean[16] = { 190 "not required", 191 "read-block", 192 "cp15 c7 ops", 193 "undefined 3", 194 "undefined 4", 195 "undefined 5", 196 "cp15 c7 ops", 197 "cp15 c7 ops", 198 "undefined 8", 199 "undefined 9", 200 "undefined 10", 201 "undefined 11", 202 "undefined 12", 203 "undefined 13", 204 "cp15 c7 ops", 205 "undefined 15", 206 }; 207 208 static const char *cache_lockdown[16] = { 209 "not supported", 210 "not supported", 211 "not supported", 212 "undefined 3", 213 "undefined 4", 214 "undefined 5", 215 "format A", 216 "format B", 217 "undefined 8", 218 "undefined 9", 219 "undefined 10", 220 "undefined 11", 221 "undefined 12", 222 "undefined 13", 223 "format C", 224 "undefined 15", 225 }; 226 227 static const char *proc_arch[] = { 228 "undefined/unknown", 229 "3", 230 "4", 231 "4T", 232 "5", 233 "5T", 234 "5TE", 235 "5TEJ", 236 "6TEJ", 237 "7", 238 "?(11)", 239 "?(12)", 240 "?(13)", 241 "?(14)", 242 "?(15)", 243 "?(16)", 244 "?(17)", 245 }; 246 247 #define CACHE_TYPE(x) (((x) >> 25) & 15) 248 #define CACHE_S(x) ((x) & (1 << 24)) 249 #define CACHE_DSIZE(x) (((x) >> 12) & 4095) /* only if S=1 */ 250 #define CACHE_ISIZE(x) ((x) & 4095) 251 252 #define CACHE_SIZE(y) (((y) >> 6) & 7) 253 #define CACHE_ASSOC(y) (((y) >> 3) & 7) 254 #define CACHE_M(y) ((y) & (1 << 2)) 255 #define CACHE_LINE(y) ((y) & 3) 256 257 static inline void dump_cache(const char *prefix, int cpu, unsigned int cache) 258 { 259 unsigned int mult = 2 + (CACHE_M(cache) ? 1 : 0); 260 261 printk("CPU%u: %s: %d bytes, associativity %d, %d byte lines, %d sets\n", 262 cpu, prefix, 263 mult << (8 + CACHE_SIZE(cache)), 264 (mult << CACHE_ASSOC(cache)) >> 1, 265 8 << CACHE_LINE(cache), 266 1 << (6 + CACHE_SIZE(cache) - CACHE_ASSOC(cache) - 267 CACHE_LINE(cache))); 268 } 269 270 static void __init dump_cpu_info(int cpu) 271 { 272 unsigned int info = read_cpuid(CPUID_CACHETYPE); 273 274 if (info != processor_id) { 275 printk("CPU%u: D %s %s cache\n", cpu, cache_is_vivt() ? "VIVT" : "VIPT", 276 cache_types[CACHE_TYPE(info)]); 277 if (CACHE_S(info)) { 278 dump_cache("I cache", cpu, CACHE_ISIZE(info)); 279 dump_cache("D cache", cpu, CACHE_DSIZE(info)); 280 } else { 281 dump_cache("cache", cpu, CACHE_ISIZE(info)); 282 } 283 } 284 285 if (arch_is_coherent()) 286 printk("Cache coherency enabled\n"); 287 } 288 289 int cpu_architecture(void) 290 { 291 int cpu_arch; 292 293 if ((processor_id & 0x0008f000) == 0) { 294 cpu_arch = CPU_ARCH_UNKNOWN; 295 } else if ((processor_id & 0x0008f000) == 0x00007000) { 296 cpu_arch = (processor_id & (1 << 23)) ? CPU_ARCH_ARMv4T : CPU_ARCH_ARMv3; 297 } else if ((processor_id & 0x00080000) == 0x00000000) { 298 cpu_arch = (processor_id >> 16) & 7; 299 if (cpu_arch) 300 cpu_arch += CPU_ARCH_ARMv3; 301 } else { 302 /* the revised CPUID */ 303 cpu_arch = ((processor_id >> 12) & 0xf) - 0xb + CPU_ARCH_ARMv6; 304 } 305 306 return cpu_arch; 307 } 308 309 /* 310 * These functions re-use the assembly code in head.S, which 311 * already provide the required functionality. 312 */ 313 extern struct proc_info_list *lookup_processor_type(unsigned int); 314 extern struct machine_desc *lookup_machine_type(unsigned int); 315 316 static void __init setup_processor(void) 317 { 318 struct proc_info_list *list; 319 320 /* 321 * locate processor in the list of supported processor 322 * types. The linker builds this table for us from the 323 * entries in arch/arm/mm/proc-*.S 324 */ 325 list = lookup_processor_type(processor_id); 326 if (!list) { 327 printk("CPU configuration botched (ID %08x), unable " 328 "to continue.\n", processor_id); 329 while (1); 330 } 331 332 cpu_name = list->cpu_name; 333 334 #ifdef MULTI_CPU 335 processor = *list->proc; 336 #endif 337 #ifdef MULTI_TLB 338 cpu_tlb = *list->tlb; 339 #endif 340 #ifdef MULTI_USER 341 cpu_user = *list->user; 342 #endif 343 #ifdef MULTI_CACHE 344 cpu_cache = *list->cache; 345 #endif 346 347 printk("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n", 348 cpu_name, processor_id, (int)processor_id & 15, 349 proc_arch[cpu_architecture()], cr_alignment); 350 351 sprintf(system_utsname.machine, "%s%c", list->arch_name, ENDIANNESS); 352 sprintf(elf_platform, "%s%c", list->elf_name, ENDIANNESS); 353 elf_hwcap = list->elf_hwcap; 354 #ifndef CONFIG_ARM_THUMB 355 elf_hwcap &= ~HWCAP_THUMB; 356 #endif 357 #ifndef CONFIG_VFP 358 elf_hwcap &= ~HWCAP_VFP; 359 #endif 360 361 cpu_proc_init(); 362 } 363 364 /* 365 * cpu_init - initialise one CPU. 366 * 367 * cpu_init dumps the cache information, initialises SMP specific 368 * information, and sets up the per-CPU stacks. 369 */ 370 void cpu_init(void) 371 { 372 unsigned int cpu = smp_processor_id(); 373 struct stack *stk = &stacks[cpu]; 374 375 if (cpu >= NR_CPUS) { 376 printk(KERN_CRIT "CPU%u: bad primary CPU number\n", cpu); 377 BUG(); 378 } 379 380 if (system_state == SYSTEM_BOOTING) 381 dump_cpu_info(cpu); 382 383 /* 384 * setup stacks for re-entrant exception handlers 385 */ 386 __asm__ ( 387 "msr cpsr_c, %1\n\t" 388 "add sp, %0, %2\n\t" 389 "msr cpsr_c, %3\n\t" 390 "add sp, %0, %4\n\t" 391 "msr cpsr_c, %5\n\t" 392 "add sp, %0, %6\n\t" 393 "msr cpsr_c, %7" 394 : 395 : "r" (stk), 396 "I" (PSR_F_BIT | PSR_I_BIT | IRQ_MODE), 397 "I" (offsetof(struct stack, irq[0])), 398 "I" (PSR_F_BIT | PSR_I_BIT | ABT_MODE), 399 "I" (offsetof(struct stack, abt[0])), 400 "I" (PSR_F_BIT | PSR_I_BIT | UND_MODE), 401 "I" (offsetof(struct stack, und[0])), 402 "I" (PSR_F_BIT | PSR_I_BIT | SVC_MODE) 403 : "r14"); 404 } 405 406 static struct machine_desc * __init setup_machine(unsigned int nr) 407 { 408 struct machine_desc *list; 409 410 /* 411 * locate machine in the list of supported machines. 412 */ 413 list = lookup_machine_type(nr); 414 if (!list) { 415 printk("Machine configuration botched (nr %d), unable " 416 "to continue.\n", nr); 417 while (1); 418 } 419 420 printk("Machine: %s\n", list->name); 421 422 return list; 423 } 424 425 static void __init early_initrd(char **p) 426 { 427 unsigned long start, size; 428 429 start = memparse(*p, p); 430 if (**p == ',') { 431 size = memparse((*p) + 1, p); 432 433 phys_initrd_start = start; 434 phys_initrd_size = size; 435 } 436 } 437 __early_param("initrd=", early_initrd); 438 439 static void __init arm_add_memory(unsigned long start, unsigned long size) 440 { 441 /* 442 * Ensure that start/size are aligned to a page boundary. 443 * Size is appropriately rounded down, start is rounded up. 444 */ 445 size -= start & ~PAGE_MASK; 446 447 meminfo.bank[meminfo.nr_banks].start = PAGE_ALIGN(start); 448 meminfo.bank[meminfo.nr_banks].size = size & PAGE_MASK; 449 meminfo.bank[meminfo.nr_banks].node = PHYS_TO_NID(start); 450 meminfo.nr_banks += 1; 451 } 452 453 /* 454 * Pick out the memory size. We look for mem=size@start, 455 * where start and size are "size[KkMm]" 456 */ 457 static void __init early_mem(char **p) 458 { 459 static int usermem __initdata = 0; 460 unsigned long size, start; 461 462 /* 463 * If the user specifies memory size, we 464 * blow away any automatically generated 465 * size. 466 */ 467 if (usermem == 0) { 468 usermem = 1; 469 meminfo.nr_banks = 0; 470 } 471 472 start = PHYS_OFFSET; 473 size = memparse(*p, p); 474 if (**p == '@') 475 start = memparse(*p + 1, p); 476 477 arm_add_memory(start, size); 478 } 479 __early_param("mem=", early_mem); 480 481 /* 482 * Initial parsing of the command line. 483 */ 484 static void __init parse_cmdline(char **cmdline_p, char *from) 485 { 486 char c = ' ', *to = command_line; 487 int len = 0; 488 489 for (;;) { 490 if (c == ' ') { 491 extern struct early_params __early_begin, __early_end; 492 struct early_params *p; 493 494 for (p = &__early_begin; p < &__early_end; p++) { 495 int len = strlen(p->arg); 496 497 if (memcmp(from, p->arg, len) == 0) { 498 if (to != command_line) 499 to -= 1; 500 from += len; 501 p->fn(&from); 502 503 while (*from != ' ' && *from != '\0') 504 from++; 505 break; 506 } 507 } 508 } 509 c = *from++; 510 if (!c) 511 break; 512 if (COMMAND_LINE_SIZE <= ++len) 513 break; 514 *to++ = c; 515 } 516 *to = '\0'; 517 *cmdline_p = command_line; 518 } 519 520 static void __init 521 setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz) 522 { 523 #ifdef CONFIG_BLK_DEV_RAM 524 extern int rd_size, rd_image_start, rd_prompt, rd_doload; 525 526 rd_image_start = image_start; 527 rd_prompt = prompt; 528 rd_doload = doload; 529 530 if (rd_sz) 531 rd_size = rd_sz; 532 #endif 533 } 534 535 static void __init 536 request_standard_resources(struct meminfo *mi, struct machine_desc *mdesc) 537 { 538 struct resource *res; 539 int i; 540 541 kernel_code.start = virt_to_phys(&_text); 542 kernel_code.end = virt_to_phys(&_etext - 1); 543 kernel_data.start = virt_to_phys(&__data_start); 544 kernel_data.end = virt_to_phys(&_end - 1); 545 546 for (i = 0; i < mi->nr_banks; i++) { 547 unsigned long virt_start, virt_end; 548 549 if (mi->bank[i].size == 0) 550 continue; 551 552 virt_start = __phys_to_virt(mi->bank[i].start); 553 virt_end = virt_start + mi->bank[i].size - 1; 554 555 res = alloc_bootmem_low(sizeof(*res)); 556 res->name = "System RAM"; 557 res->start = __virt_to_phys(virt_start); 558 res->end = __virt_to_phys(virt_end); 559 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; 560 561 request_resource(&iomem_resource, res); 562 563 if (kernel_code.start >= res->start && 564 kernel_code.end <= res->end) 565 request_resource(res, &kernel_code); 566 if (kernel_data.start >= res->start && 567 kernel_data.end <= res->end) 568 request_resource(res, &kernel_data); 569 } 570 571 if (mdesc->video_start) { 572 video_ram.start = mdesc->video_start; 573 video_ram.end = mdesc->video_end; 574 request_resource(&iomem_resource, &video_ram); 575 } 576 577 /* 578 * Some machines don't have the possibility of ever 579 * possessing lp0, lp1 or lp2 580 */ 581 if (mdesc->reserve_lp0) 582 request_resource(&ioport_resource, &lp0); 583 if (mdesc->reserve_lp1) 584 request_resource(&ioport_resource, &lp1); 585 if (mdesc->reserve_lp2) 586 request_resource(&ioport_resource, &lp2); 587 } 588 589 /* 590 * Tag parsing. 591 * 592 * This is the new way of passing data to the kernel at boot time. Rather 593 * than passing a fixed inflexible structure to the kernel, we pass a list 594 * of variable-sized tags to the kernel. The first tag must be a ATAG_CORE 595 * tag for the list to be recognised (to distinguish the tagged list from 596 * a param_struct). The list is terminated with a zero-length tag (this tag 597 * is not parsed in any way). 598 */ 599 static int __init parse_tag_core(const struct tag *tag) 600 { 601 if (tag->hdr.size > 2) { 602 if ((tag->u.core.flags & 1) == 0) 603 root_mountflags &= ~MS_RDONLY; 604 ROOT_DEV = old_decode_dev(tag->u.core.rootdev); 605 } 606 return 0; 607 } 608 609 __tagtable(ATAG_CORE, parse_tag_core); 610 611 static int __init parse_tag_mem32(const struct tag *tag) 612 { 613 if (meminfo.nr_banks >= NR_BANKS) { 614 printk(KERN_WARNING 615 "Ignoring memory bank 0x%08x size %dKB\n", 616 tag->u.mem.start, tag->u.mem.size / 1024); 617 return -EINVAL; 618 } 619 arm_add_memory(tag->u.mem.start, tag->u.mem.size); 620 return 0; 621 } 622 623 __tagtable(ATAG_MEM, parse_tag_mem32); 624 625 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE) 626 struct screen_info screen_info = { 627 .orig_video_lines = 30, 628 .orig_video_cols = 80, 629 .orig_video_mode = 0, 630 .orig_video_ega_bx = 0, 631 .orig_video_isVGA = 1, 632 .orig_video_points = 8 633 }; 634 635 static int __init parse_tag_videotext(const struct tag *tag) 636 { 637 screen_info.orig_x = tag->u.videotext.x; 638 screen_info.orig_y = tag->u.videotext.y; 639 screen_info.orig_video_page = tag->u.videotext.video_page; 640 screen_info.orig_video_mode = tag->u.videotext.video_mode; 641 screen_info.orig_video_cols = tag->u.videotext.video_cols; 642 screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx; 643 screen_info.orig_video_lines = tag->u.videotext.video_lines; 644 screen_info.orig_video_isVGA = tag->u.videotext.video_isvga; 645 screen_info.orig_video_points = tag->u.videotext.video_points; 646 return 0; 647 } 648 649 __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext); 650 #endif 651 652 static int __init parse_tag_ramdisk(const struct tag *tag) 653 { 654 setup_ramdisk((tag->u.ramdisk.flags & 1) == 0, 655 (tag->u.ramdisk.flags & 2) == 0, 656 tag->u.ramdisk.start, tag->u.ramdisk.size); 657 return 0; 658 } 659 660 __tagtable(ATAG_RAMDISK, parse_tag_ramdisk); 661 662 static int __init parse_tag_initrd(const struct tag *tag) 663 { 664 printk(KERN_WARNING "ATAG_INITRD is deprecated; " 665 "please update your bootloader.\n"); 666 phys_initrd_start = __virt_to_phys(tag->u.initrd.start); 667 phys_initrd_size = tag->u.initrd.size; 668 return 0; 669 } 670 671 __tagtable(ATAG_INITRD, parse_tag_initrd); 672 673 static int __init parse_tag_initrd2(const struct tag *tag) 674 { 675 phys_initrd_start = tag->u.initrd.start; 676 phys_initrd_size = tag->u.initrd.size; 677 return 0; 678 } 679 680 __tagtable(ATAG_INITRD2, parse_tag_initrd2); 681 682 static int __init parse_tag_serialnr(const struct tag *tag) 683 { 684 system_serial_low = tag->u.serialnr.low; 685 system_serial_high = tag->u.serialnr.high; 686 return 0; 687 } 688 689 __tagtable(ATAG_SERIAL, parse_tag_serialnr); 690 691 static int __init parse_tag_revision(const struct tag *tag) 692 { 693 system_rev = tag->u.revision.rev; 694 return 0; 695 } 696 697 __tagtable(ATAG_REVISION, parse_tag_revision); 698 699 static int __init parse_tag_cmdline(const struct tag *tag) 700 { 701 strlcpy(default_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE); 702 return 0; 703 } 704 705 __tagtable(ATAG_CMDLINE, parse_tag_cmdline); 706 707 /* 708 * Scan the tag table for this tag, and call its parse function. 709 * The tag table is built by the linker from all the __tagtable 710 * declarations. 711 */ 712 static int __init parse_tag(const struct tag *tag) 713 { 714 extern struct tagtable __tagtable_begin, __tagtable_end; 715 struct tagtable *t; 716 717 for (t = &__tagtable_begin; t < &__tagtable_end; t++) 718 if (tag->hdr.tag == t->tag) { 719 t->parse(tag); 720 break; 721 } 722 723 return t < &__tagtable_end; 724 } 725 726 /* 727 * Parse all tags in the list, checking both the global and architecture 728 * specific tag tables. 729 */ 730 static void __init parse_tags(const struct tag *t) 731 { 732 for (; t->hdr.size; t = tag_next(t)) 733 if (!parse_tag(t)) 734 printk(KERN_WARNING 735 "Ignoring unrecognised tag 0x%08x\n", 736 t->hdr.tag); 737 } 738 739 /* 740 * This holds our defaults. 741 */ 742 static struct init_tags { 743 struct tag_header hdr1; 744 struct tag_core core; 745 struct tag_header hdr2; 746 struct tag_mem32 mem; 747 struct tag_header hdr3; 748 } init_tags __initdata = { 749 { tag_size(tag_core), ATAG_CORE }, 750 { 1, PAGE_SIZE, 0xff }, 751 { tag_size(tag_mem32), ATAG_MEM }, 752 { MEM_SIZE, PHYS_OFFSET }, 753 { 0, ATAG_NONE } 754 }; 755 756 static void (*init_machine)(void) __initdata; 757 758 static int __init customize_machine(void) 759 { 760 /* customizes platform devices, or adds new ones */ 761 if (init_machine) 762 init_machine(); 763 return 0; 764 } 765 arch_initcall(customize_machine); 766 767 void __init setup_arch(char **cmdline_p) 768 { 769 struct tag *tags = (struct tag *)&init_tags; 770 struct machine_desc *mdesc; 771 char *from = default_command_line; 772 773 setup_processor(); 774 mdesc = setup_machine(machine_arch_type); 775 machine_name = mdesc->name; 776 777 if (mdesc->soft_reboot) 778 reboot_setup("s"); 779 780 if (mdesc->boot_params) 781 tags = phys_to_virt(mdesc->boot_params); 782 783 /* 784 * If we have the old style parameters, convert them to 785 * a tag list. 786 */ 787 if (tags->hdr.tag != ATAG_CORE) 788 convert_to_tag_list(tags); 789 if (tags->hdr.tag != ATAG_CORE) 790 tags = (struct tag *)&init_tags; 791 792 if (mdesc->fixup) 793 mdesc->fixup(mdesc, tags, &from, &meminfo); 794 795 if (tags->hdr.tag == ATAG_CORE) { 796 if (meminfo.nr_banks != 0) 797 squash_mem_tags(tags); 798 parse_tags(tags); 799 } 800 801 init_mm.start_code = (unsigned long) &_text; 802 init_mm.end_code = (unsigned long) &_etext; 803 init_mm.end_data = (unsigned long) &_edata; 804 init_mm.brk = (unsigned long) &_end; 805 806 memcpy(saved_command_line, from, COMMAND_LINE_SIZE); 807 saved_command_line[COMMAND_LINE_SIZE-1] = '\0'; 808 parse_cmdline(cmdline_p, from); 809 paging_init(&meminfo, mdesc); 810 request_standard_resources(&meminfo, mdesc); 811 812 #ifdef CONFIG_SMP 813 smp_init_cpus(); 814 #endif 815 816 cpu_init(); 817 818 /* 819 * Set up various architecture-specific pointers 820 */ 821 init_arch_irq = mdesc->init_irq; 822 system_timer = mdesc->timer; 823 init_machine = mdesc->init_machine; 824 825 #ifdef CONFIG_VT 826 #if defined(CONFIG_VGA_CONSOLE) 827 conswitchp = &vga_con; 828 #elif defined(CONFIG_DUMMY_CONSOLE) 829 conswitchp = &dummy_con; 830 #endif 831 #endif 832 } 833 834 835 static int __init topology_init(void) 836 { 837 int cpu; 838 839 for_each_possible_cpu(cpu) 840 register_cpu(&per_cpu(cpu_data, cpu).cpu, cpu); 841 842 return 0; 843 } 844 845 subsys_initcall(topology_init); 846 847 static const char *hwcap_str[] = { 848 "swp", 849 "half", 850 "thumb", 851 "26bit", 852 "fastmult", 853 "fpa", 854 "vfp", 855 "edsp", 856 "java", 857 NULL 858 }; 859 860 static void 861 c_show_cache(struct seq_file *m, const char *type, unsigned int cache) 862 { 863 unsigned int mult = 2 + (CACHE_M(cache) ? 1 : 0); 864 865 seq_printf(m, "%s size\t\t: %d\n" 866 "%s assoc\t\t: %d\n" 867 "%s line length\t: %d\n" 868 "%s sets\t\t: %d\n", 869 type, mult << (8 + CACHE_SIZE(cache)), 870 type, (mult << CACHE_ASSOC(cache)) >> 1, 871 type, 8 << CACHE_LINE(cache), 872 type, 1 << (6 + CACHE_SIZE(cache) - CACHE_ASSOC(cache) - 873 CACHE_LINE(cache))); 874 } 875 876 static int c_show(struct seq_file *m, void *v) 877 { 878 int i; 879 880 seq_printf(m, "Processor\t: %s rev %d (%s)\n", 881 cpu_name, (int)processor_id & 15, elf_platform); 882 883 #if defined(CONFIG_SMP) 884 for_each_online_cpu(i) { 885 /* 886 * glibc reads /proc/cpuinfo to determine the number of 887 * online processors, looking for lines beginning with 888 * "processor". Give glibc what it expects. 889 */ 890 seq_printf(m, "processor\t: %d\n", i); 891 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n", 892 per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ), 893 (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100); 894 } 895 #else /* CONFIG_SMP */ 896 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n", 897 loops_per_jiffy / (500000/HZ), 898 (loops_per_jiffy / (5000/HZ)) % 100); 899 #endif 900 901 /* dump out the processor features */ 902 seq_puts(m, "Features\t: "); 903 904 for (i = 0; hwcap_str[i]; i++) 905 if (elf_hwcap & (1 << i)) 906 seq_printf(m, "%s ", hwcap_str[i]); 907 908 seq_printf(m, "\nCPU implementer\t: 0x%02x\n", processor_id >> 24); 909 seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]); 910 911 if ((processor_id & 0x0008f000) == 0x00000000) { 912 /* pre-ARM7 */ 913 seq_printf(m, "CPU part\t\t: %07x\n", processor_id >> 4); 914 } else { 915 if ((processor_id & 0x0008f000) == 0x00007000) { 916 /* ARM7 */ 917 seq_printf(m, "CPU variant\t: 0x%02x\n", 918 (processor_id >> 16) & 127); 919 } else { 920 /* post-ARM7 */ 921 seq_printf(m, "CPU variant\t: 0x%x\n", 922 (processor_id >> 20) & 15); 923 } 924 seq_printf(m, "CPU part\t: 0x%03x\n", 925 (processor_id >> 4) & 0xfff); 926 } 927 seq_printf(m, "CPU revision\t: %d\n", processor_id & 15); 928 929 { 930 unsigned int cache_info = read_cpuid(CPUID_CACHETYPE); 931 if (cache_info != processor_id) { 932 seq_printf(m, "Cache type\t: %s\n" 933 "Cache clean\t: %s\n" 934 "Cache lockdown\t: %s\n" 935 "Cache format\t: %s\n", 936 cache_types[CACHE_TYPE(cache_info)], 937 cache_clean[CACHE_TYPE(cache_info)], 938 cache_lockdown[CACHE_TYPE(cache_info)], 939 CACHE_S(cache_info) ? "Harvard" : "Unified"); 940 941 if (CACHE_S(cache_info)) { 942 c_show_cache(m, "I", CACHE_ISIZE(cache_info)); 943 c_show_cache(m, "D", CACHE_DSIZE(cache_info)); 944 } else { 945 c_show_cache(m, "Cache", CACHE_ISIZE(cache_info)); 946 } 947 } 948 } 949 950 seq_puts(m, "\n"); 951 952 seq_printf(m, "Hardware\t: %s\n", machine_name); 953 seq_printf(m, "Revision\t: %04x\n", system_rev); 954 seq_printf(m, "Serial\t\t: %08x%08x\n", 955 system_serial_high, system_serial_low); 956 957 return 0; 958 } 959 960 static void *c_start(struct seq_file *m, loff_t *pos) 961 { 962 return *pos < 1 ? (void *)1 : NULL; 963 } 964 965 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 966 { 967 ++*pos; 968 return NULL; 969 } 970 971 static void c_stop(struct seq_file *m, void *v) 972 { 973 } 974 975 struct seq_operations cpuinfo_op = { 976 .start = c_start, 977 .next = c_next, 978 .stop = c_stop, 979 .show = c_show 980 }; 981