arch/arm/kernel/setup.c

   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 #include <linux/fs.h>
  27
  28 #include <asm/cpu.h>
  29 #include <asm/cputype.h>
  30 #include <asm/elf.h>
  31 #include <asm/procinfo.h>
  32 #include <asm/setup.h>
  33 #include <asm/mach-types.h>
  34 #include <asm/cacheflush.h>
  35 #include <asm/cachetype.h>
  36 #include <asm/tlbflush.h>
  37
  38 #include <asm/mach/arch.h>
  39 #include <asm/mach/irq.h>
  40 #include <asm/mach/time.h>
  41 #include <asm/traps.h>
  42
  43 #include "compat.h"
  44 #include "atags.h"
  45
  46 #ifndef MEM_SIZE
  47 #define MEM_SIZE        (16*1024*1024)
  48 #endif
  49
  50 #if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE)
  51 char fpe_type[8];
  52
  53 static int __init fpe_setup(char *line)
  54 {
  55         memcpy(fpe_type, line, 8);
  56         return 1;
  57 }
  58
  59 __setup("fpe=", fpe_setup);
  60 #endif
  61
  62 extern void paging_init(struct meminfo *, struct machine_desc *desc);
  63 extern void reboot_setup(char *str);
  64 extern void _text, _etext, __data_start, _edata, _end;
  65
  66 unsigned int processor_id;
  67 EXPORT_SYMBOL(processor_id);
  68 unsigned int __machine_arch_type;
  69 EXPORT_SYMBOL(__machine_arch_type);
  70 unsigned int cacheid;
  71 EXPORT_SYMBOL(cacheid);
  72
  73 unsigned int __atags_pointer __initdata;
  74
  75 unsigned int system_rev;
  76 EXPORT_SYMBOL(system_rev);
  77
  78 unsigned int system_serial_low;
  79 EXPORT_SYMBOL(system_serial_low);
  80
  81 unsigned int system_serial_high;
  82 EXPORT_SYMBOL(system_serial_high);
  83
  84 unsigned int elf_hwcap;
  85 EXPORT_SYMBOL(elf_hwcap);
  86
  87
  88 #ifdef MULTI_CPU
  89 struct processor processor;
  90 #endif
  91 #ifdef MULTI_TLB
  92 struct cpu_tlb_fns cpu_tlb;
  93 #endif
  94 #ifdef MULTI_USER
  95 struct cpu_user_fns cpu_user;
  96 #endif
  97 #ifdef MULTI_CACHE
  98 struct cpu_cache_fns cpu_cache;
  99 #endif
 100 #ifdef CONFIG_OUTER_CACHE
 101 struct outer_cache_fns outer_cache;
 102 #endif
 103
 104 struct stack {
 105         u32 irq[3];
 106         u32 abt[3];
 107         u32 und[3];
 108 } ____cacheline_aligned;
 109
 110 static struct stack stacks[NR_CPUS];
 111
 112 char elf_platform[ELF_PLATFORM_SIZE];
 113 EXPORT_SYMBOL(elf_platform);
 114
 115 static struct meminfo meminfo __initdata = { 0, };
 116 static const char *cpu_name;
 117 static const char *machine_name;
 118 static char __initdata command_line[COMMAND_LINE_SIZE];
 119
 120 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
 121 static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } };
 122 #define ENDIANNESS ((char)endian_test.l)
 123
 124 DEFINE_PER_CPU(struct cpuinfo_arm, cpu_data);
 125
 126 /*
 127  * Standard memory resources
 128  */
 129 static struct resource mem_res[] = {
 130         {
 131                 .name = "Video RAM",
 132                 .start = 0,
 133                 .end = 0,
 134                 .flags = IORESOURCE_MEM
 135         },
 136         {
 137                 .name = "Kernel text",
 138                 .start = 0,
 139                 .end = 0,
 140                 .flags = IORESOURCE_MEM
 141         },
 142         {
 143                 .name = "Kernel data",
 144                 .start = 0,
 145                 .end = 0,
 146                 .flags = IORESOURCE_MEM
 147         }
 148 };
 149
 150 #define video_ram   mem_res[0]
 151 #define kernel_code mem_res[1]
 152 #define kernel_data mem_res[2]
 153
 154 static struct resource io_res[] = {
 155         {
 156                 .name = "reserved",
 157                 .start = 0x3bc,
 158                 .end = 0x3be,
 159                 .flags = IORESOURCE_IO | IORESOURCE_BUSY
 160         },
 161         {
 162                 .name = "reserved",
 163                 .start = 0x378,
 164                 .end = 0x37f,
 165                 .flags = IORESOURCE_IO | IORESOURCE_BUSY
 166         },
 167         {
 168                 .name = "reserved",
 169                 .start = 0x278,
 170                 .end = 0x27f,
 171                 .flags = IORESOURCE_IO | IORESOURCE_BUSY
 172         }
 173 };
 174
 175 #define lp0 io_res[0]
 176 #define lp1 io_res[1]
 177 #define lp2 io_res[2]
 178
 179 static const char *proc_arch[] = {
 180         "undefined/unknown",
 181         "3",
 182         "4",
 183         "4T",
 184         "5",
 185         "5T",
 186         "5TE",
 187         "5TEJ",
 188         "6TEJ",
 189         "7",
 190         "?(11)",
 191         "?(12)",
 192         "?(13)",
 193         "?(14)",
 194         "?(15)",
 195         "?(16)",
 196         "?(17)",
 197 };
 198
 199 int cpu_architecture(void)
 200 {
 201         int cpu_arch;
 202
 203         if ((read_cpuid_id() & 0x0008f000) == 0) {
 204                 cpu_arch = CPU_ARCH_UNKNOWN;
 205         } else if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
 206                 cpu_arch = (read_cpuid_id() & (1 << 23)) ? CPU_ARCH_ARMv4T : CPU_ARCH_ARMv3;
 207         } else if ((read_cpuid_id() & 0x00080000) == 0x00000000) {
 208                 cpu_arch = (read_cpuid_id() >> 16) & 7;
 209                 if (cpu_arch)
 210                         cpu_arch += CPU_ARCH_ARMv3;
 211         } else if ((read_cpuid_id() & 0x000f0000) == 0x000f0000) {
 212                 unsigned int mmfr0;
 213
 214                 /* Revised CPUID format. Read the Memory Model Feature
 215                  * Register 0 and check for VMSAv7 or PMSAv7 */
 216                 asm("mrc        p15, 0, %0, c0, c1, 4"
 217                     : "=r" (mmfr0));
 218                 if ((mmfr0 & 0x0000000f) == 0x00000003 ||
 219                     (mmfr0 & 0x000000f0) == 0x00000030)
 220                         cpu_arch = CPU_ARCH_ARMv7;
 221                 else if ((mmfr0 & 0x0000000f) == 0x00000002 ||
 222                          (mmfr0 & 0x000000f0) == 0x00000020)
 223                         cpu_arch = CPU_ARCH_ARMv6;
 224                 else
 225                         cpu_arch = CPU_ARCH_UNKNOWN;
 226         } else
 227                 cpu_arch = CPU_ARCH_UNKNOWN;
 228
 229         return cpu_arch;
 230 }
 231
 232 static void __init cacheid_init(void)
 233 {
 234         unsigned int cachetype = read_cpuid_cachetype();
 235         unsigned int arch = cpu_architecture();
 236
 237         if (arch >= CPU_ARCH_ARMv7) {
 238                 cacheid = CACHEID_VIPT_NONALIASING;
 239                 if ((cachetype & (3 << 14)) == 1 << 14)
 240                         cacheid |= CACHEID_ASID_TAGGED;
 241         } else if (arch >= CPU_ARCH_ARMv6) {
 242                 if (cachetype & (1 << 23))
 243                         cacheid = CACHEID_VIPT_ALIASING;
 244                 else
 245                         cacheid = CACHEID_VIPT_NONALIASING;
 246         } else {
 247                 cacheid = CACHEID_VIVT;
 248         }
 249
 250         printk("CPU: %s data cache, %s instruction cache\n",
 251                 cache_is_vivt() ? "VIVT" :
 252                 cache_is_vipt_aliasing() ? "VIPT aliasing" :
 253                 cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown",
 254                 cache_is_vivt() ? "VIVT" :
 255                 icache_is_vivt_asid_tagged() ? "VIVT ASID tagged" :
 256                 cache_is_vipt_aliasing() ? "VIPT aliasing" :
 257                 cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown");
 258 }
 259
 260 /*
 261  * These functions re-use the assembly code in head.S, which
 262  * already provide the required functionality.
 263  */
 264 extern struct proc_info_list *lookup_processor_type(unsigned int);
 265 extern struct machine_desc *lookup_machine_type(unsigned int);
 266
 267 static void __init setup_processor(void)
 268 {
 269         struct proc_info_list *list;
 270
 271         /*
 272          * locate processor in the list of supported processor
 273          * types.  The linker builds this table for us from the
 274          * entries in arch/arm/mm/proc-*.S
 275          */
 276         list = lookup_processor_type(read_cpuid_id());
 277         if (!list) {
 278                 printk("CPU configuration botched (ID %08x), unable "
 279                        "to continue.\n", read_cpuid_id());
 280                 while (1);
 281         }
 282
 283         cpu_name = list->cpu_name;
 284
 285 #ifdef MULTI_CPU
 286         processor = *list->proc;
 287 #endif
 288 #ifdef MULTI_TLB
 289         cpu_tlb = *list->tlb;
 290 #endif
 291 #ifdef MULTI_USER
 292         cpu_user = *list->user;
 293 #endif
 294 #ifdef MULTI_CACHE
 295         cpu_cache = *list->cache;
 296 #endif
 297
 298         printk("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n",
 299                cpu_name, read_cpuid_id(), read_cpuid_id() & 15,
 300                proc_arch[cpu_architecture()], cr_alignment);
 301
 302         sprintf(init_utsname()->machine, "%s%c", list->arch_name, ENDIANNESS);
 303         sprintf(elf_platform, "%s%c", list->elf_name, ENDIANNESS);
 304         elf_hwcap = list->elf_hwcap;
 305 #ifndef CONFIG_ARM_THUMB
 306         elf_hwcap &= ~HWCAP_THUMB;
 307 #endif
 308
 309         cacheid_init();
 310         cpu_proc_init();
 311 }
 312
 313 /*
 314  * cpu_init - initialise one CPU.
 315  *
 316  * cpu_init sets up the per-CPU stacks.
 317  */
 318 void cpu_init(void)
 319 {
 320         unsigned int cpu = smp_processor_id();
 321         struct stack *stk = &stacks[cpu];
 322
 323         if (cpu >= NR_CPUS) {
 324                 printk(KERN_CRIT "CPU%u: bad primary CPU number\n", cpu);
 325                 BUG();
 326         }
 327
 328         /*
 329          * setup stacks for re-entrant exception handlers
 330          */
 331         __asm__ (
 332         "msr    cpsr_c, %1\n\t"
 333         "add    sp, %0, %2\n\t"
 334         "msr    cpsr_c, %3\n\t"
 335         "add    sp, %0, %4\n\t"
 336         "msr    cpsr_c, %5\n\t"
 337         "add    sp, %0, %6\n\t"
 338         "msr    cpsr_c, %7"
 339             :
 340             : "r" (stk),
 341               "I" (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
 342               "I" (offsetof(struct stack, irq[0])),
 343               "I" (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
 344               "I" (offsetof(struct stack, abt[0])),
 345               "I" (PSR_F_BIT | PSR_I_BIT | UND_MODE),
 346               "I" (offsetof(struct stack, und[0])),
 347               "I" (PSR_F_BIT | PSR_I_BIT | SVC_MODE)
 348             : "r14");
 349 }
 350
 351 static struct machine_desc * __init setup_machine(unsigned int nr)
 352 {
 353         struct machine_desc *list;
 354
 355         /*
 356          * locate machine in the list of supported machines.
 357          */
 358         list = lookup_machine_type(nr);
 359         if (!list) {
 360                 printk("Machine configuration botched (nr %d), unable "
 361                        "to continue.\n", nr);
 362                 while (1);
 363         }
 364
 365         printk("Machine: %s\n", list->name);
 366
 367         return list;
 368 }
 369
 370 static void __init arm_add_memory(unsigned long start, unsigned long size)
 371 {
 372         struct membank *bank;
 373
 374         /*
 375          * Ensure that start/size are aligned to a page boundary.
 376          * Size is appropriately rounded down, start is rounded up.
 377          */
 378         size -= start & ~PAGE_MASK;
 379
 380         bank = &meminfo.bank[meminfo.nr_banks++];
 381
 382         bank->start = PAGE_ALIGN(start);
 383         bank->size  = size & PAGE_MASK;
 384         bank->node  = PHYS_TO_NID(start);
 385 }
 386
 387 /*
 388  * Pick out the memory size.  We look for mem=size@start,
 389  * where start and size are "size[KkMm]"
 390  */
 391 static void __init early_mem(char **p)
 392 {
 393         static int usermem __initdata = 0;
 394         unsigned long size, start;
 395
 396         /*
 397          * If the user specifies memory size, we
 398          * blow away any automatically generated
 399          * size.
 400          */
 401         if (usermem == 0) {
 402                 usermem = 1;
 403                 meminfo.nr_banks = 0;
 404         }
 405
 406         start = PHYS_OFFSET;
 407         size  = memparse(*p, p);
 408         if (**p == '@')
 409                 start = memparse(*p + 1, p);
 410
 411         arm_add_memory(start, size);
 412 }
 413 __early_param("mem=", early_mem);
 414
 415 /*
 416  * Initial parsing of the command line.
 417  */
 418 static void __init parse_cmdline(char **cmdline_p, char *from)
 419 {
 420         char c = ' ', *to = command_line;
 421         int len = 0;
 422
 423         for (;;) {
 424                 if (c == ' ') {
 425                         extern struct early_params __early_begin, __early_end;
 426                         struct early_params *p;
 427
 428                         for (p = &__early_begin; p < &__early_end; p++) {
 429                                 int arglen = strlen(p->arg);
 430
 431                                 if (memcmp(from, p->arg, arglen) == 0) {
 432                                         if (to != command_line)
 433                                                 to -= 1;
 434                                         from += arglen;
 435                                         p->fn(&from);
 436
 437                                         while (*from != ' ' && *from != '\0')
 438                                                 from++;
 439                                         break;
 440                                 }
 441                         }
 442                 }
 443                 c = *from++;
 444                 if (!c)
 445                         break;
 446                 if (COMMAND_LINE_SIZE <= ++len)
 447                         break;
 448                 *to++ = c;
 449         }
 450         *to = '\0';
 451         *cmdline_p = command_line;
 452 }
 453
 454 static void __init
 455 setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
 456 {
 457 #ifdef CONFIG_BLK_DEV_RAM
 458         extern int rd_size, rd_image_start, rd_prompt, rd_doload;
 459
 460         rd_image_start = image_start;
 461         rd_prompt = prompt;
 462         rd_doload = doload;
 463
 464         if (rd_sz)
 465                 rd_size = rd_sz;
 466 #endif
 467 }
 468
 469 static void __init
 470 request_standard_resources(struct meminfo *mi, struct machine_desc *mdesc)
 471 {
 472         struct resource *res;
 473         int i;
 474
 475         kernel_code.start   = virt_to_phys(&_text);
 476         kernel_code.end     = virt_to_phys(&_etext - 1);
 477         kernel_data.start   = virt_to_phys(&__data_start);
 478         kernel_data.end     = virt_to_phys(&_end - 1);
 479
 480         for (i = 0; i < mi->nr_banks; i++) {
 481                 if (mi->bank[i].size == 0)
 482                         continue;
 483
 484                 res = alloc_bootmem_low(sizeof(*res));
 485                 res->name  = "System RAM";
 486                 res->start = mi->bank[i].start;
 487                 res->end   = mi->bank[i].start + mi->bank[i].size - 1;
 488                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 489
 490                 request_resource(&iomem_resource, res);
 491
 492                 if (kernel_code.start >= res->start &&
 493                     kernel_code.end <= res->end)
 494                         request_resource(res, &kernel_code);
 495                 if (kernel_data.start >= res->start &&
 496                     kernel_data.end <= res->end)
 497                         request_resource(res, &kernel_data);
 498         }
 499
 500         if (mdesc->video_start) {
 501                 video_ram.start = mdesc->video_start;
 502                 video_ram.end   = mdesc->video_end;
 503                 request_resource(&iomem_resource, &video_ram);
 504         }
 505
 506         /*
 507          * Some machines don't have the possibility of ever
 508          * possessing lp0, lp1 or lp2
 509          */
 510         if (mdesc->reserve_lp0)
 511                 request_resource(&ioport_resource, &lp0);
 512         if (mdesc->reserve_lp1)
 513                 request_resource(&ioport_resource, &lp1);
 514         if (mdesc->reserve_lp2)
 515                 request_resource(&ioport_resource, &lp2);
 516 }
 517
 518 /*
 519  *  Tag parsing.
 520  *
 521  * This is the new way of passing data to the kernel at boot time.  Rather
 522  * than passing a fixed inflexible structure to the kernel, we pass a list
 523  * of variable-sized tags to the kernel.  The first tag must be a ATAG_CORE
 524  * tag for the list to be recognised (to distinguish the tagged list from
 525  * a param_struct).  The list is terminated with a zero-length tag (this tag
 526  * is not parsed in any way).
 527  */
 528 static int __init parse_tag_core(const struct tag *tag)
 529 {
 530         if (tag->hdr.size > 2) {
 531                 if ((tag->u.core.flags & 1) == 0)
 532                         root_mountflags &= ~MS_RDONLY;
 533                 ROOT_DEV = old_decode_dev(tag->u.core.rootdev);
 534         }
 535         return 0;
 536 }
 537
 538 __tagtable(ATAG_CORE, parse_tag_core);
 539
 540 static int __init parse_tag_mem32(const struct tag *tag)
 541 {
 542         if (meminfo.nr_banks >= NR_BANKS) {
 543                 printk(KERN_WARNING
 544                        "Ignoring memory bank 0x%08x size %dKB\n",
 545                         tag->u.mem.start, tag->u.mem.size / 1024);
 546                 return -EINVAL;
 547         }
 548         arm_add_memory(tag->u.mem.start, tag->u.mem.size);
 549         return 0;
 550 }
 551
 552 __tagtable(ATAG_MEM, parse_tag_mem32);
 553
 554 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
 555 struct screen_info screen_info = {
 556  .orig_video_lines      = 30,
 557  .orig_video_cols       = 80,
 558  .orig_video_mode       = 0,
 559  .orig_video_ega_bx     = 0,
 560  .orig_video_isVGA      = 1,
 561  .orig_video_points     = 8
 562 };
 563
 564 static int __init parse_tag_videotext(const struct tag *tag)
 565 {
 566         screen_info.orig_x            = tag->u.videotext.x;
 567         screen_info.orig_y            = tag->u.videotext.y;
 568         screen_info.orig_video_page   = tag->u.videotext.video_page;
 569         screen_info.orig_video_mode   = tag->u.videotext.video_mode;
 570         screen_info.orig_video_cols   = tag->u.videotext.video_cols;
 571         screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
 572         screen_info.orig_video_lines  = tag->u.videotext.video_lines;
 573         screen_info.orig_video_isVGA  = tag->u.videotext.video_isvga;
 574         screen_info.orig_video_points = tag->u.videotext.video_points;
 575         return 0;
 576 }
 577
 578 __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
 579 #endif
 580
 581 static int __init parse_tag_ramdisk(const struct tag *tag)
 582 {
 583         setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
 584                       (tag->u.ramdisk.flags & 2) == 0,
 585                       tag->u.ramdisk.start, tag->u.ramdisk.size);
 586         return 0;
 587 }
 588
 589 __tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
 590
 591 static int __init parse_tag_serialnr(const struct tag *tag)
 592 {
 593         system_serial_low = tag->u.serialnr.low;
 594         system_serial_high = tag->u.serialnr.high;
 595         return 0;
 596 }
 597
 598 __tagtable(ATAG_SERIAL, parse_tag_serialnr);
 599
 600 static int __init parse_tag_revision(const struct tag *tag)
 601 {
 602         system_rev = tag->u.revision.rev;
 603         return 0;
 604 }
 605
 606 __tagtable(ATAG_REVISION, parse_tag_revision);
 607
 608 static int __init parse_tag_cmdline(const struct tag *tag)
 609 {
 610         strlcpy(default_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE);
 611         return 0;
 612 }
 613
 614 __tagtable(ATAG_CMDLINE, parse_tag_cmdline);
 615
 616 /*
 617  * Scan the tag table for this tag, and call its parse function.
 618  * The tag table is built by the linker from all the __tagtable
 619  * declarations.
 620  */
 621 static int __init parse_tag(const struct tag *tag)
 622 {
 623         extern struct tagtable __tagtable_begin, __tagtable_end;
 624         struct tagtable *t;
 625
 626         for (t = &__tagtable_begin; t < &__tagtable_end; t++)
 627                 if (tag->hdr.tag == t->tag) {
 628                         t->parse(tag);
 629                         break;
 630                 }
 631
 632         return t < &__tagtable_end;
 633 }
 634
 635 /*
 636  * Parse all tags in the list, checking both the global and architecture
 637  * specific tag tables.
 638  */
 639 static void __init parse_tags(const struct tag *t)
 640 {
 641         for (; t->hdr.size; t = tag_next(t))
 642                 if (!parse_tag(t))
 643                         printk(KERN_WARNING
 644                                 "Ignoring unrecognised tag 0x%08x\n",
 645                                 t->hdr.tag);
 646 }
 647
 648 /*
 649  * This holds our defaults.
 650  */
 651 static struct init_tags {
 652         struct tag_header hdr1;
 653         struct tag_core   core;
 654         struct tag_header hdr2;
 655         struct tag_mem32  mem;
 656         struct tag_header hdr3;
 657 } init_tags __initdata = {
 658         { tag_size(tag_core), ATAG_CORE },
 659         { 1, PAGE_SIZE, 0xff },
 660         { tag_size(tag_mem32), ATAG_MEM },
 661         { MEM_SIZE, PHYS_OFFSET },
 662         { 0, ATAG_NONE }
 663 };
 664
 665 static void (*init_machine)(void) __initdata;
 666
 667 static int __init customize_machine(void)
 668 {
 669         /* customizes platform devices, or adds new ones */
 670         if (init_machine)
 671                 init_machine();
 672         return 0;
 673 }
 674 arch_initcall(customize_machine);
 675
 676 void __init setup_arch(char **cmdline_p)
 677 {
 678         struct tag *tags = (struct tag *)&init_tags;
 679         struct machine_desc *mdesc;
 680         char *from = default_command_line;
 681
 682         setup_processor();
 683         mdesc = setup_machine(machine_arch_type);
 684         machine_name = mdesc->name;
 685
 686         if (mdesc->soft_reboot)
 687                 reboot_setup("s");
 688
 689         if (__atags_pointer)
 690                 tags = phys_to_virt(__atags_pointer);
 691         else if (mdesc->boot_params)
 692                 tags = phys_to_virt(mdesc->boot_params);
 693
 694         /*
 695          * If we have the old style parameters, convert them to
 696          * a tag list.
 697          */
 698         if (tags->hdr.tag != ATAG_CORE)
 699                 convert_to_tag_list(tags);
 700         if (tags->hdr.tag != ATAG_CORE)
 701                 tags = (struct tag *)&init_tags;
 702
 703         if (mdesc->fixup)
 704                 mdesc->fixup(mdesc, tags, &from, &meminfo);
 705
 706         if (tags->hdr.tag == ATAG_CORE) {
 707                 if (meminfo.nr_banks != 0)
 708                         squash_mem_tags(tags);
 709                 save_atags(tags);
 710                 parse_tags(tags);
 711         }
 712
 713         init_mm.start_code = (unsigned long) &_text;
 714         init_mm.end_code   = (unsigned long) &_etext;
 715         init_mm.end_data   = (unsigned long) &_edata;
 716         init_mm.brk        = (unsigned long) &_end;
 717
 718         memcpy(boot_command_line, from, COMMAND_LINE_SIZE);
 719         boot_command_line[COMMAND_LINE_SIZE-1] = '\0';
 720         parse_cmdline(cmdline_p, from);
 721         paging_init(&meminfo, mdesc);
 722         request_standard_resources(&meminfo, mdesc);
 723
 724 #ifdef CONFIG_SMP
 725         smp_init_cpus();
 726 #endif
 727
 728         cpu_init();
 729
 730         /*
 731          * Set up various architecture-specific pointers
 732          */
 733         init_arch_irq = mdesc->init_irq;
 734         system_timer = mdesc->timer;
 735         init_machine = mdesc->init_machine;
 736
 737 #ifdef CONFIG_VT
 738 #if defined(CONFIG_VGA_CONSOLE)
 739         conswitchp = &vga_con;
 740 #elif defined(CONFIG_DUMMY_CONSOLE)
 741         conswitchp = &dummy_con;
 742 #endif
 743 #endif
 744         early_trap_init();
 745 }
 746
 747
 748 static int __init topology_init(void)
 749 {
 750         int cpu;
 751
 752         for_each_possible_cpu(cpu) {
 753                 struct cpuinfo_arm *cpuinfo = &per_cpu(cpu_data, cpu);
 754                 cpuinfo->cpu.hotpluggable = 1;
 755                 register_cpu(&cpuinfo->cpu, cpu);
 756         }
 757
 758         return 0;
 759 }
 760
 761 subsys_initcall(topology_init);
 762
 763 static const char *hwcap_str[] = {
 764         "swp",
 765         "half",
 766         "thumb",
 767         "26bit",
 768         "fastmult",
 769         "fpa",
 770         "vfp",
 771         "edsp",
 772         "java",
 773         "iwmmxt",
 774         "crunch",
 775         NULL
 776 };
 777
 778 static int c_show(struct seq_file *m, void *v)
 779 {
 780         int i;
 781
 782         seq_printf(m, "Processor\t: %s rev %d (%s)\n",
 783                    cpu_name, read_cpuid_id() & 15, elf_platform);
 784
 785 #if defined(CONFIG_SMP)
 786         for_each_online_cpu(i) {
 787                 /*
 788                  * glibc reads /proc/cpuinfo to determine the number of
 789                  * online processors, looking for lines beginning with
 790                  * "processor".  Give glibc what it expects.
 791                  */
 792                 seq_printf(m, "processor\t: %d\n", i);
 793                 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
 794                            per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
 795                            (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
 796         }
 797 #else /* CONFIG_SMP */
 798         seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
 799                    loops_per_jiffy / (500000/HZ),
 800                    (loops_per_jiffy / (5000/HZ)) % 100);
 801 #endif
 802
 803         /* dump out the processor features */
 804         seq_puts(m, "Features\t: ");
 805
 806         for (i = 0; hwcap_str[i]; i++)
 807                 if (elf_hwcap & (1 << i))
 808                         seq_printf(m, "%s ", hwcap_str[i]);
 809
 810         seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
 811         seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);
 812
 813         if ((read_cpuid_id() & 0x0008f000) == 0x00000000) {
 814                 /* pre-ARM7 */
 815                 seq_printf(m, "CPU part\t: %07x\n", read_cpuid_id() >> 4);
 816         } else {
 817                 if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
 818                         /* ARM7 */
 819                         seq_printf(m, "CPU variant\t: 0x%02x\n",
 820                                    (read_cpuid_id() >> 16) & 127);
 821                 } else {
 822                         /* post-ARM7 */
 823                         seq_printf(m, "CPU variant\t: 0x%x\n",
 824                                    (read_cpuid_id() >> 20) & 15);
 825                 }
 826                 seq_printf(m, "CPU part\t: 0x%03x\n",
 827                            (read_cpuid_id() >> 4) & 0xfff);
 828         }
 829         seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15);
 830
 831         seq_puts(m, "\n");
 832
 833         seq_printf(m, "Hardware\t: %s\n", machine_name);
 834         seq_printf(m, "Revision\t: %04x\n", system_rev);
 835         seq_printf(m, "Serial\t\t: %08x%08x\n",
 836                    system_serial_high, system_serial_low);
 837
 838         return 0;
 839 }
 840
 841 static void *c_start(struct seq_file *m, loff_t *pos)
 842 {
 843         return *pos < 1 ? (void *)1 : NULL;
 844 }
 845
 846 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 847 {
 848         ++*pos;
 849         return NULL;
 850 }
 851
 852 static void c_stop(struct seq_file *m, void *v)
 853 {
 854 }
 855
 856 const struct seq_operations cpuinfo_op = {
 857         .start  = c_start,
 858         .next   = c_next,
 859         .stop   = c_stop,
 860         .show   = c_show
 861 };