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                 unsigned long virt_start, virt_end;
 482
 483                 if (mi->bank[i].size == 0)
 484                         continue;
 485
 486                 virt_start = __phys_to_virt(mi->bank[i].start);
 487                 virt_end   = virt_start + mi->bank[i].size - 1;
 488
 489                 res = alloc_bootmem_low(sizeof(*res));
 490                 res->name  = "System RAM";
 491                 res->start = __virt_to_phys(virt_start);
 492                 res->end   = __virt_to_phys(virt_end);
 493                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 494
 495                 request_resource(&iomem_resource, res);
 496
 497                 if (kernel_code.start >= res->start &&
 498                     kernel_code.end <= res->end)
 499                         request_resource(res, &kernel_code);
 500                 if (kernel_data.start >= res->start &&
 501                     kernel_data.end <= res->end)
 502                         request_resource(res, &kernel_data);
 503         }
 504
 505         if (mdesc->video_start) {
 506                 video_ram.start = mdesc->video_start;
 507                 video_ram.end   = mdesc->video_end;
 508                 request_resource(&iomem_resource, &video_ram);
 509         }
 510
 511         /*
 512          * Some machines don't have the possibility of ever
 513          * possessing lp0, lp1 or lp2
 514          */
 515         if (mdesc->reserve_lp0)
 516                 request_resource(&ioport_resource, &lp0);
 517         if (mdesc->reserve_lp1)
 518                 request_resource(&ioport_resource, &lp1);
 519         if (mdesc->reserve_lp2)
 520                 request_resource(&ioport_resource, &lp2);
 521 }
 522
 523 /*
 524  *  Tag parsing.
 525  *
 526  * This is the new way of passing data to the kernel at boot time.  Rather
 527  * than passing a fixed inflexible structure to the kernel, we pass a list
 528  * of variable-sized tags to the kernel.  The first tag must be a ATAG_CORE
 529  * tag for the list to be recognised (to distinguish the tagged list from
 530  * a param_struct).  The list is terminated with a zero-length tag (this tag
 531  * is not parsed in any way).
 532  */
 533 static int __init parse_tag_core(const struct tag *tag)
 534 {
 535         if (tag->hdr.size > 2) {
 536                 if ((tag->u.core.flags & 1) == 0)
 537                         root_mountflags &= ~MS_RDONLY;
 538                 ROOT_DEV = old_decode_dev(tag->u.core.rootdev);
 539         }
 540         return 0;
 541 }
 542
 543 __tagtable(ATAG_CORE, parse_tag_core);
 544
 545 static int __init parse_tag_mem32(const struct tag *tag)
 546 {
 547         if (meminfo.nr_banks >= NR_BANKS) {
 548                 printk(KERN_WARNING
 549                        "Ignoring memory bank 0x%08x size %dKB\n",
 550                         tag->u.mem.start, tag->u.mem.size / 1024);
 551                 return -EINVAL;
 552         }
 553         arm_add_memory(tag->u.mem.start, tag->u.mem.size);
 554         return 0;
 555 }
 556
 557 __tagtable(ATAG_MEM, parse_tag_mem32);
 558
 559 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
 560 struct screen_info screen_info = {
 561  .orig_video_lines      = 30,
 562  .orig_video_cols       = 80,
 563  .orig_video_mode       = 0,
 564  .orig_video_ega_bx     = 0,
 565  .orig_video_isVGA      = 1,
 566  .orig_video_points     = 8
 567 };
 568
 569 static int __init parse_tag_videotext(const struct tag *tag)
 570 {
 571         screen_info.orig_x            = tag->u.videotext.x;
 572         screen_info.orig_y            = tag->u.videotext.y;
 573         screen_info.orig_video_page   = tag->u.videotext.video_page;
 574         screen_info.orig_video_mode   = tag->u.videotext.video_mode;
 575         screen_info.orig_video_cols   = tag->u.videotext.video_cols;
 576         screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
 577         screen_info.orig_video_lines  = tag->u.videotext.video_lines;
 578         screen_info.orig_video_isVGA  = tag->u.videotext.video_isvga;
 579         screen_info.orig_video_points = tag->u.videotext.video_points;
 580         return 0;
 581 }
 582
 583 __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
 584 #endif
 585
 586 static int __init parse_tag_ramdisk(const struct tag *tag)
 587 {
 588         setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
 589                       (tag->u.ramdisk.flags & 2) == 0,
 590                       tag->u.ramdisk.start, tag->u.ramdisk.size);
 591         return 0;
 592 }
 593
 594 __tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
 595
 596 static int __init parse_tag_serialnr(const struct tag *tag)
 597 {
 598         system_serial_low = tag->u.serialnr.low;
 599         system_serial_high = tag->u.serialnr.high;
 600         return 0;
 601 }
 602
 603 __tagtable(ATAG_SERIAL, parse_tag_serialnr);
 604
 605 static int __init parse_tag_revision(const struct tag *tag)
 606 {
 607         system_rev = tag->u.revision.rev;
 608         return 0;
 609 }
 610
 611 __tagtable(ATAG_REVISION, parse_tag_revision);
 612
 613 static int __init parse_tag_cmdline(const struct tag *tag)
 614 {
 615         strlcpy(default_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE);
 616         return 0;
 617 }
 618
 619 __tagtable(ATAG_CMDLINE, parse_tag_cmdline);
 620
 621 /*
 622  * Scan the tag table for this tag, and call its parse function.
 623  * The tag table is built by the linker from all the __tagtable
 624  * declarations.
 625  */
 626 static int __init parse_tag(const struct tag *tag)
 627 {
 628         extern struct tagtable __tagtable_begin, __tagtable_end;
 629         struct tagtable *t;
 630
 631         for (t = &__tagtable_begin; t < &__tagtable_end; t++)
 632                 if (tag->hdr.tag == t->tag) {
 633                         t->parse(tag);
 634                         break;
 635                 }
 636
 637         return t < &__tagtable_end;
 638 }
 639
 640 /*
 641  * Parse all tags in the list, checking both the global and architecture
 642  * specific tag tables.
 643  */
 644 static void __init parse_tags(const struct tag *t)
 645 {
 646         for (; t->hdr.size; t = tag_next(t))
 647                 if (!parse_tag(t))
 648                         printk(KERN_WARNING
 649                                 "Ignoring unrecognised tag 0x%08x\n",
 650                                 t->hdr.tag);
 651 }
 652
 653 /*
 654  * This holds our defaults.
 655  */
 656 static struct init_tags {
 657         struct tag_header hdr1;
 658         struct tag_core   core;
 659         struct tag_header hdr2;
 660         struct tag_mem32  mem;
 661         struct tag_header hdr3;
 662 } init_tags __initdata = {
 663         { tag_size(tag_core), ATAG_CORE },
 664         { 1, PAGE_SIZE, 0xff },
 665         { tag_size(tag_mem32), ATAG_MEM },
 666         { MEM_SIZE, PHYS_OFFSET },
 667         { 0, ATAG_NONE }
 668 };
 669
 670 static void (*init_machine)(void) __initdata;
 671
 672 static int __init customize_machine(void)
 673 {
 674         /* customizes platform devices, or adds new ones */
 675         if (init_machine)
 676                 init_machine();
 677         return 0;
 678 }
 679 arch_initcall(customize_machine);
 680
 681 void __init setup_arch(char **cmdline_p)
 682 {
 683         struct tag *tags = (struct tag *)&init_tags;
 684         struct machine_desc *mdesc;
 685         char *from = default_command_line;
 686
 687         setup_processor();
 688         mdesc = setup_machine(machine_arch_type);
 689         machine_name = mdesc->name;
 690
 691         if (mdesc->soft_reboot)
 692                 reboot_setup("s");
 693
 694         if (__atags_pointer)
 695                 tags = phys_to_virt(__atags_pointer);
 696         else if (mdesc->boot_params)
 697                 tags = phys_to_virt(mdesc->boot_params);
 698
 699         /*
 700          * If we have the old style parameters, convert them to
 701          * a tag list.
 702          */
 703         if (tags->hdr.tag != ATAG_CORE)
 704                 convert_to_tag_list(tags);
 705         if (tags->hdr.tag != ATAG_CORE)
 706                 tags = (struct tag *)&init_tags;
 707
 708         if (mdesc->fixup)
 709                 mdesc->fixup(mdesc, tags, &from, &meminfo);
 710
 711         if (tags->hdr.tag == ATAG_CORE) {
 712                 if (meminfo.nr_banks != 0)
 713                         squash_mem_tags(tags);
 714                 save_atags(tags);
 715                 parse_tags(tags);
 716         }
 717
 718         init_mm.start_code = (unsigned long) &_text;
 719         init_mm.end_code   = (unsigned long) &_etext;
 720         init_mm.end_data   = (unsigned long) &_edata;
 721         init_mm.brk        = (unsigned long) &_end;
 722
 723         memcpy(boot_command_line, from, COMMAND_LINE_SIZE);
 724         boot_command_line[COMMAND_LINE_SIZE-1] = '\0';
 725         parse_cmdline(cmdline_p, from);
 726         paging_init(&meminfo, mdesc);
 727         request_standard_resources(&meminfo, mdesc);
 728
 729 #ifdef CONFIG_SMP
 730         smp_init_cpus();
 731 #endif
 732
 733         cpu_init();
 734
 735         /*
 736          * Set up various architecture-specific pointers
 737          */
 738         init_arch_irq = mdesc->init_irq;
 739         system_timer = mdesc->timer;
 740         init_machine = mdesc->init_machine;
 741
 742 #ifdef CONFIG_VT
 743 #if defined(CONFIG_VGA_CONSOLE)
 744         conswitchp = &vga_con;
 745 #elif defined(CONFIG_DUMMY_CONSOLE)
 746         conswitchp = &dummy_con;
 747 #endif
 748 #endif
 749         early_trap_init();
 750 }
 751
 752
 753 static int __init topology_init(void)
 754 {
 755         int cpu;
 756
 757         for_each_possible_cpu(cpu) {
 758                 struct cpuinfo_arm *cpuinfo = &per_cpu(cpu_data, cpu);
 759                 cpuinfo->cpu.hotpluggable = 1;
 760                 register_cpu(&cpuinfo->cpu, cpu);
 761         }
 762
 763         return 0;
 764 }
 765
 766 subsys_initcall(topology_init);
 767
 768 static const char *hwcap_str[] = {
 769         "swp",
 770         "half",
 771         "thumb",
 772         "26bit",
 773         "fastmult",
 774         "fpa",
 775         "vfp",
 776         "edsp",
 777         "java",
 778         "iwmmxt",
 779         "crunch",
 780         NULL
 781 };
 782
 783 static int c_show(struct seq_file *m, void *v)
 784 {
 785         int i;
 786
 787         seq_printf(m, "Processor\t: %s rev %d (%s)\n",
 788                    cpu_name, read_cpuid_id() & 15, elf_platform);
 789
 790 #if defined(CONFIG_SMP)
 791         for_each_online_cpu(i) {
 792                 /*
 793                  * glibc reads /proc/cpuinfo to determine the number of
 794                  * online processors, looking for lines beginning with
 795                  * "processor".  Give glibc what it expects.
 796                  */
 797                 seq_printf(m, "processor\t: %d\n", i);
 798                 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
 799                            per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
 800                            (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
 801         }
 802 #else /* CONFIG_SMP */
 803         seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
 804                    loops_per_jiffy / (500000/HZ),
 805                    (loops_per_jiffy / (5000/HZ)) % 100);
 806 #endif
 807
 808         /* dump out the processor features */
 809         seq_puts(m, "Features\t: ");
 810
 811         for (i = 0; hwcap_str[i]; i++)
 812                 if (elf_hwcap & (1 << i))
 813                         seq_printf(m, "%s ", hwcap_str[i]);
 814
 815         seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
 816         seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);
 817
 818         if ((read_cpuid_id() & 0x0008f000) == 0x00000000) {
 819                 /* pre-ARM7 */
 820                 seq_printf(m, "CPU part\t: %07x\n", read_cpuid_id() >> 4);
 821         } else {
 822                 if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
 823                         /* ARM7 */
 824                         seq_printf(m, "CPU variant\t: 0x%02x\n",
 825                                    (read_cpuid_id() >> 16) & 127);
 826                 } else {
 827                         /* post-ARM7 */
 828                         seq_printf(m, "CPU variant\t: 0x%x\n",
 829                                    (read_cpuid_id() >> 20) & 15);
 830                 }
 831                 seq_printf(m, "CPU part\t: 0x%03x\n",
 832                            (read_cpuid_id() >> 4) & 0xfff);
 833         }
 834         seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15);
 835
 836         seq_puts(m, "\n");
 837
 838         seq_printf(m, "Hardware\t: %s\n", machine_name);
 839         seq_printf(m, "Revision\t: %04x\n", system_rev);
 840         seq_printf(m, "Serial\t\t: %08x%08x\n",
 841                    system_serial_high, system_serial_low);
 842
 843         return 0;
 844 }
 845
 846 static void *c_start(struct seq_file *m, loff_t *pos)
 847 {
 848         return *pos < 1 ? (void *)1 : NULL;
 849 }
 850
 851 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 852 {
 853         ++*pos;
 854         return NULL;
 855 }
 856
 857 static void c_stop(struct seq_file *m, void *v)
 858 {
 859 }
 860
 861 const struct seq_operations cpuinfo_op = {
 862         .start  = c_start,
 863         .next   = c_next,
 864         .stop   = c_stop,
 865         .show   = c_show
 866 };