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/elf.h>
  30 #include <asm/procinfo.h>
  31 #include <asm/setup.h>
  32 #include <asm/mach-types.h>
  33 #include <asm/cacheflush.h>
  34 #include <asm/tlbflush.h>
  35
  36 #include <asm/mach/arch.h>
  37 #include <asm/mach/irq.h>
  38 #include <asm/mach/time.h>
  39
  40 #include "compat.h"
  41 #include "atags.h"
  42
  43 #ifndef MEM_SIZE
  44 #define MEM_SIZE        (16*1024*1024)
  45 #endif
  46
  47 #if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE)
  48 char fpe_type[8];
  49
  50 static int __init fpe_setup(char *line)
  51 {
  52         memcpy(fpe_type, line, 8);
  53         return 1;
  54 }
  55
  56 __setup("fpe=", fpe_setup);
  57 #endif
  58
  59 extern void paging_init(struct meminfo *, struct machine_desc *desc);
  60 extern void reboot_setup(char *str);
  61 extern int root_mountflags;
  62 extern void _stext, _text, _etext, __data_start, _edata, _end;
  63
  64 unsigned int processor_id;
  65 EXPORT_SYMBOL(processor_id);
  66 unsigned int __machine_arch_type;
  67 EXPORT_SYMBOL(__machine_arch_type);
  68
  69 unsigned int __atags_pointer __initdata;
  70
  71 unsigned int system_rev;
  72 EXPORT_SYMBOL(system_rev);
  73
  74 unsigned int system_serial_low;
  75 EXPORT_SYMBOL(system_serial_low);
  76
  77 unsigned int system_serial_high;
  78 EXPORT_SYMBOL(system_serial_high);
  79
  80 unsigned int elf_hwcap;
  81 EXPORT_SYMBOL(elf_hwcap);
  82
  83
  84 #ifdef MULTI_CPU
  85 struct processor processor;
  86 #endif
  87 #ifdef MULTI_TLB
  88 struct cpu_tlb_fns cpu_tlb;
  89 #endif
  90 #ifdef MULTI_USER
  91 struct cpu_user_fns cpu_user;
  92 #endif
  93 #ifdef MULTI_CACHE
  94 struct cpu_cache_fns cpu_cache;
  95 #endif
  96 #ifdef CONFIG_OUTER_CACHE
  97 struct outer_cache_fns outer_cache;
  98 #endif
  99
 100 struct stack {
 101         u32 irq[3];
 102         u32 abt[3];
 103         u32 und[3];
 104 } ____cacheline_aligned;
 105
 106 static struct stack stacks[NR_CPUS];
 107
 108 char elf_platform[ELF_PLATFORM_SIZE];
 109 EXPORT_SYMBOL(elf_platform);
 110
 111 unsigned long phys_initrd_start __initdata = 0;
 112 unsigned long phys_initrd_size __initdata = 0;
 113
 114 static struct meminfo meminfo __initdata = { 0, };
 115 static const char *cpu_name;
 116 static const char *machine_name;
 117 static char __initdata command_line[COMMAND_LINE_SIZE];
 118
 119 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
 120 static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } };
 121 #define ENDIANNESS ((char)endian_test.l)
 122
 123 DEFINE_PER_CPU(struct cpuinfo_arm, cpu_data);
 124
 125 /*
 126  * Standard memory resources
 127  */
 128 static struct resource mem_res[] = {
 129         {
 130                 .name = "Video RAM",
 131                 .start = 0,
 132                 .end = 0,
 133                 .flags = IORESOURCE_MEM
 134         },
 135         {
 136                 .name = "Kernel text",
 137                 .start = 0,
 138                 .end = 0,
 139                 .flags = IORESOURCE_MEM
 140         },
 141         {
 142                 .name = "Kernel data",
 143                 .start = 0,
 144                 .end = 0,
 145                 .flags = IORESOURCE_MEM
 146         }
 147 };
 148
 149 #define video_ram   mem_res[0]
 150 #define kernel_code mem_res[1]
 151 #define kernel_data mem_res[2]
 152
 153 static struct resource io_res[] = {
 154         {
 155                 .name = "reserved",
 156                 .start = 0x3bc,
 157                 .end = 0x3be,
 158                 .flags = IORESOURCE_IO | IORESOURCE_BUSY
 159         },
 160         {
 161                 .name = "reserved",
 162                 .start = 0x378,
 163                 .end = 0x37f,
 164                 .flags = IORESOURCE_IO | IORESOURCE_BUSY
 165         },
 166         {
 167                 .name = "reserved",
 168                 .start = 0x278,
 169                 .end = 0x27f,
 170                 .flags = IORESOURCE_IO | IORESOURCE_BUSY
 171         }
 172 };
 173
 174 #define lp0 io_res[0]
 175 #define lp1 io_res[1]
 176 #define lp2 io_res[2]
 177
 178 static const char *cache_types[16] = {
 179         "write-through",
 180         "write-back",
 181         "write-back",
 182         "undefined 3",
 183         "undefined 4",
 184         "undefined 5",
 185         "write-back",
 186         "write-back",
 187         "undefined 8",
 188         "undefined 9",
 189         "undefined 10",
 190         "undefined 11",
 191         "undefined 12",
 192         "undefined 13",
 193         "write-back",
 194         "undefined 15",
 195 };
 196
 197 static const char *cache_clean[16] = {
 198         "not required",
 199         "read-block",
 200         "cp15 c7 ops",
 201         "undefined 3",
 202         "undefined 4",
 203         "undefined 5",
 204         "cp15 c7 ops",
 205         "cp15 c7 ops",
 206         "undefined 8",
 207         "undefined 9",
 208         "undefined 10",
 209         "undefined 11",
 210         "undefined 12",
 211         "undefined 13",
 212         "cp15 c7 ops",
 213         "undefined 15",
 214 };
 215
 216 static const char *cache_lockdown[16] = {
 217         "not supported",
 218         "not supported",
 219         "not supported",
 220         "undefined 3",
 221         "undefined 4",
 222         "undefined 5",
 223         "format A",
 224         "format B",
 225         "undefined 8",
 226         "undefined 9",
 227         "undefined 10",
 228         "undefined 11",
 229         "undefined 12",
 230         "undefined 13",
 231         "format C",
 232         "undefined 15",
 233 };
 234
 235 static const char *proc_arch[] = {
 236         "undefined/unknown",
 237         "3",
 238         "4",
 239         "4T",
 240         "5",
 241         "5T",
 242         "5TE",
 243         "5TEJ",
 244         "6TEJ",
 245         "7",
 246         "?(11)",
 247         "?(12)",
 248         "?(13)",
 249         "?(14)",
 250         "?(15)",
 251         "?(16)",
 252         "?(17)",
 253 };
 254
 255 #define CACHE_TYPE(x)   (((x) >> 25) & 15)
 256 #define CACHE_S(x)      ((x) & (1 << 24))
 257 #define CACHE_DSIZE(x)  (((x) >> 12) & 4095)    /* only if S=1 */
 258 #define CACHE_ISIZE(x)  ((x) & 4095)
 259
 260 #define CACHE_SIZE(y)   (((y) >> 6) & 7)
 261 #define CACHE_ASSOC(y)  (((y) >> 3) & 7)
 262 #define CACHE_M(y)      ((y) & (1 << 2))
 263 #define CACHE_LINE(y)   ((y) & 3)
 264
 265 static inline void dump_cache(const char *prefix, int cpu, unsigned int cache)
 266 {
 267         unsigned int mult = 2 + (CACHE_M(cache) ? 1 : 0);
 268
 269         printk("CPU%u: %s: %d bytes, associativity %d, %d byte lines, %d sets\n",
 270                 cpu, prefix,
 271                 mult << (8 + CACHE_SIZE(cache)),
 272                 (mult << CACHE_ASSOC(cache)) >> 1,
 273                 8 << CACHE_LINE(cache),
 274                 1 << (6 + CACHE_SIZE(cache) - CACHE_ASSOC(cache) -
 275                         CACHE_LINE(cache)));
 276 }
 277
 278 static void __init dump_cpu_info(int cpu)
 279 {
 280         unsigned int info = read_cpuid(CPUID_CACHETYPE);
 281
 282         if (info != processor_id) {
 283                 printk("CPU%u: D %s %s cache\n", cpu, cache_is_vivt() ? "VIVT" : "VIPT",
 284                        cache_types[CACHE_TYPE(info)]);
 285                 if (CACHE_S(info)) {
 286                         dump_cache("I cache", cpu, CACHE_ISIZE(info));
 287                         dump_cache("D cache", cpu, CACHE_DSIZE(info));
 288                 } else {
 289                         dump_cache("cache", cpu, CACHE_ISIZE(info));
 290                 }
 291         }
 292
 293         if (arch_is_coherent())
 294                 printk("Cache coherency enabled\n");
 295 }
 296
 297 int cpu_architecture(void)
 298 {
 299         int cpu_arch;
 300
 301         if ((processor_id & 0x0008f000) == 0) {
 302                 cpu_arch = CPU_ARCH_UNKNOWN;
 303         } else if ((processor_id & 0x0008f000) == 0x00007000) {
 304                 cpu_arch = (processor_id & (1 << 23)) ? CPU_ARCH_ARMv4T : CPU_ARCH_ARMv3;
 305         } else if ((processor_id & 0x00080000) == 0x00000000) {
 306                 cpu_arch = (processor_id >> 16) & 7;
 307                 if (cpu_arch)
 308                         cpu_arch += CPU_ARCH_ARMv3;
 309         } else if ((processor_id & 0x000f0000) == 0x000f0000) {
 310                 unsigned int mmfr0;
 311
 312                 /* Revised CPUID format. Read the Memory Model Feature
 313                  * Register 0 and check for VMSAv7 or PMSAv7 */
 314                 asm("mrc        p15, 0, %0, c0, c1, 4"
 315                     : "=r" (mmfr0));
 316                 if ((mmfr0 & 0x0000000f) == 0x00000003 ||
 317                     (mmfr0 & 0x000000f0) == 0x00000030)
 318                         cpu_arch = CPU_ARCH_ARMv7;
 319                 else if ((mmfr0 & 0x0000000f) == 0x00000002 ||
 320                          (mmfr0 & 0x000000f0) == 0x00000020)
 321                         cpu_arch = CPU_ARCH_ARMv6;
 322                 else
 323                         cpu_arch = CPU_ARCH_UNKNOWN;
 324         } else
 325                 cpu_arch = CPU_ARCH_UNKNOWN;
 326
 327         return cpu_arch;
 328 }
 329
 330 /*
 331  * These functions re-use the assembly code in head.S, which
 332  * already provide the required functionality.
 333  */
 334 extern struct proc_info_list *lookup_processor_type(unsigned int);
 335 extern struct machine_desc *lookup_machine_type(unsigned int);
 336
 337 static void __init setup_processor(void)
 338 {
 339         struct proc_info_list *list;
 340
 341         /*
 342          * locate processor in the list of supported processor
 343          * types.  The linker builds this table for us from the
 344          * entries in arch/arm/mm/proc-*.S
 345          */
 346         list = lookup_processor_type(processor_id);
 347         if (!list) {
 348                 printk("CPU configuration botched (ID %08x), unable "
 349                        "to continue.\n", processor_id);
 350                 while (1);
 351         }
 352
 353         cpu_name = list->cpu_name;
 354
 355 #ifdef MULTI_CPU
 356         processor = *list->proc;
 357 #endif
 358 #ifdef MULTI_TLB
 359         cpu_tlb = *list->tlb;
 360 #endif
 361 #ifdef MULTI_USER
 362         cpu_user = *list->user;
 363 #endif
 364 #ifdef MULTI_CACHE
 365         cpu_cache = *list->cache;
 366 #endif
 367
 368         printk("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n",
 369                cpu_name, processor_id, (int)processor_id & 15,
 370                proc_arch[cpu_architecture()], cr_alignment);
 371
 372         sprintf(init_utsname()->machine, "%s%c", list->arch_name, ENDIANNESS);
 373         sprintf(elf_platform, "%s%c", list->elf_name, ENDIANNESS);
 374         elf_hwcap = list->elf_hwcap;
 375 #ifndef CONFIG_ARM_THUMB
 376         elf_hwcap &= ~HWCAP_THUMB;
 377 #endif
 378
 379         cpu_proc_init();
 380 }
 381
 382 /*
 383  * cpu_init - initialise one CPU.
 384  *
 385  * cpu_init dumps the cache information, initialises SMP specific
 386  * information, and sets up the per-CPU stacks.
 387  */
 388 void cpu_init(void)
 389 {
 390         unsigned int cpu = smp_processor_id();
 391         struct stack *stk = &stacks[cpu];
 392
 393         if (cpu >= NR_CPUS) {
 394                 printk(KERN_CRIT "CPU%u: bad primary CPU number\n", cpu);
 395                 BUG();
 396         }
 397
 398         if (system_state == SYSTEM_BOOTING)
 399                 dump_cpu_info(cpu);
 400
 401         /*
 402          * setup stacks for re-entrant exception handlers
 403          */
 404         __asm__ (
 405         "msr    cpsr_c, %1\n\t"
 406         "add    sp, %0, %2\n\t"
 407         "msr    cpsr_c, %3\n\t"
 408         "add    sp, %0, %4\n\t"
 409         "msr    cpsr_c, %5\n\t"
 410         "add    sp, %0, %6\n\t"
 411         "msr    cpsr_c, %7"
 412             :
 413             : "r" (stk),
 414               "I" (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
 415               "I" (offsetof(struct stack, irq[0])),
 416               "I" (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
 417               "I" (offsetof(struct stack, abt[0])),
 418               "I" (PSR_F_BIT | PSR_I_BIT | UND_MODE),
 419               "I" (offsetof(struct stack, und[0])),
 420               "I" (PSR_F_BIT | PSR_I_BIT | SVC_MODE)
 421             : "r14");
 422 }
 423
 424 static struct machine_desc * __init setup_machine(unsigned int nr)
 425 {
 426         struct machine_desc *list;
 427
 428         /*
 429          * locate machine in the list of supported machines.
 430          */
 431         list = lookup_machine_type(nr);
 432         if (!list) {
 433                 printk("Machine configuration botched (nr %d), unable "
 434                        "to continue.\n", nr);
 435                 while (1);
 436         }
 437
 438         printk("Machine: %s\n", list->name);
 439
 440         return list;
 441 }
 442
 443 static void __init early_initrd(char **p)
 444 {
 445         unsigned long start, size;
 446
 447         start = memparse(*p, p);
 448         if (**p == ',') {
 449                 size = memparse((*p) + 1, p);
 450
 451                 phys_initrd_start = start;
 452                 phys_initrd_size = size;
 453         }
 454 }
 455 __early_param("initrd=", early_initrd);
 456
 457 static void __init arm_add_memory(unsigned long start, unsigned long size)
 458 {
 459         struct membank *bank;
 460
 461         /*
 462          * Ensure that start/size are aligned to a page boundary.
 463          * Size is appropriately rounded down, start is rounded up.
 464          */
 465         size -= start & ~PAGE_MASK;
 466
 467         bank = &meminfo.bank[meminfo.nr_banks++];
 468
 469         bank->start = PAGE_ALIGN(start);
 470         bank->size  = size & PAGE_MASK;
 471         bank->node  = PHYS_TO_NID(start);
 472 }
 473
 474 /*
 475  * Pick out the memory size.  We look for mem=size@start,
 476  * where start and size are "size[KkMm]"
 477  */
 478 static void __init early_mem(char **p)
 479 {
 480         static int usermem __initdata = 0;
 481         unsigned long size, start;
 482
 483         /*
 484          * If the user specifies memory size, we
 485          * blow away any automatically generated
 486          * size.
 487          */
 488         if (usermem == 0) {
 489                 usermem = 1;
 490                 meminfo.nr_banks = 0;
 491         }
 492
 493         start = PHYS_OFFSET;
 494         size  = memparse(*p, p);
 495         if (**p == '@')
 496                 start = memparse(*p + 1, p);
 497
 498         arm_add_memory(start, size);
 499 }
 500 __early_param("mem=", early_mem);
 501
 502 /*
 503  * Initial parsing of the command line.
 504  */
 505 static void __init parse_cmdline(char **cmdline_p, char *from)
 506 {
 507         char c = ' ', *to = command_line;
 508         int len = 0;
 509
 510         for (;;) {
 511                 if (c == ' ') {
 512                         extern struct early_params __early_begin, __early_end;
 513                         struct early_params *p;
 514
 515                         for (p = &__early_begin; p < &__early_end; p++) {
 516                                 int len = strlen(p->arg);
 517
 518                                 if (memcmp(from, p->arg, len) == 0) {
 519                                         if (to != command_line)
 520                                                 to -= 1;
 521                                         from += len;
 522                                         p->fn(&from);
 523
 524                                         while (*from != ' ' && *from != '\0')
 525                                                 from++;
 526                                         break;
 527                                 }
 528                         }
 529                 }
 530                 c = *from++;
 531                 if (!c)
 532                         break;
 533                 if (COMMAND_LINE_SIZE <= ++len)
 534                         break;
 535                 *to++ = c;
 536         }
 537         *to = '\0';
 538         *cmdline_p = command_line;
 539 }
 540
 541 static void __init
 542 setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
 543 {
 544 #ifdef CONFIG_BLK_DEV_RAM
 545         extern int rd_size, rd_image_start, rd_prompt, rd_doload;
 546
 547         rd_image_start = image_start;
 548         rd_prompt = prompt;
 549         rd_doload = doload;
 550
 551         if (rd_sz)
 552                 rd_size = rd_sz;
 553 #endif
 554 }
 555
 556 static void __init
 557 request_standard_resources(struct meminfo *mi, struct machine_desc *mdesc)
 558 {
 559         struct resource *res;
 560         int i;
 561
 562         kernel_code.start   = virt_to_phys(&_text);
 563         kernel_code.end     = virt_to_phys(&_etext - 1);
 564         kernel_data.start   = virt_to_phys(&__data_start);
 565         kernel_data.end     = virt_to_phys(&_end - 1);
 566
 567         for (i = 0; i < mi->nr_banks; i++) {
 568                 unsigned long virt_start, virt_end;
 569
 570                 if (mi->bank[i].size == 0)
 571                         continue;
 572
 573                 virt_start = __phys_to_virt(mi->bank[i].start);
 574                 virt_end   = virt_start + mi->bank[i].size - 1;
 575
 576                 res = alloc_bootmem_low(sizeof(*res));
 577                 res->name  = "System RAM";
 578                 res->start = __virt_to_phys(virt_start);
 579                 res->end   = __virt_to_phys(virt_end);
 580                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 581
 582                 request_resource(&iomem_resource, res);
 583
 584                 if (kernel_code.start >= res->start &&
 585                     kernel_code.end <= res->end)
 586                         request_resource(res, &kernel_code);
 587                 if (kernel_data.start >= res->start &&
 588                     kernel_data.end <= res->end)
 589                         request_resource(res, &kernel_data);
 590         }
 591
 592         if (mdesc->video_start) {
 593                 video_ram.start = mdesc->video_start;
 594                 video_ram.end   = mdesc->video_end;
 595                 request_resource(&iomem_resource, &video_ram);
 596         }
 597
 598         /*
 599          * Some machines don't have the possibility of ever
 600          * possessing lp0, lp1 or lp2
 601          */
 602         if (mdesc->reserve_lp0)
 603                 request_resource(&ioport_resource, &lp0);
 604         if (mdesc->reserve_lp1)
 605                 request_resource(&ioport_resource, &lp1);
 606         if (mdesc->reserve_lp2)
 607                 request_resource(&ioport_resource, &lp2);
 608 }
 609
 610 /*
 611  *  Tag parsing.
 612  *
 613  * This is the new way of passing data to the kernel at boot time.  Rather
 614  * than passing a fixed inflexible structure to the kernel, we pass a list
 615  * of variable-sized tags to the kernel.  The first tag must be a ATAG_CORE
 616  * tag for the list to be recognised (to distinguish the tagged list from
 617  * a param_struct).  The list is terminated with a zero-length tag (this tag
 618  * is not parsed in any way).
 619  */
 620 static int __init parse_tag_core(const struct tag *tag)
 621 {
 622         if (tag->hdr.size > 2) {
 623                 if ((tag->u.core.flags & 1) == 0)
 624                         root_mountflags &= ~MS_RDONLY;
 625                 ROOT_DEV = old_decode_dev(tag->u.core.rootdev);
 626         }
 627         return 0;
 628 }
 629
 630 __tagtable(ATAG_CORE, parse_tag_core);
 631
 632 static int __init parse_tag_mem32(const struct tag *tag)
 633 {
 634         if (meminfo.nr_banks >= NR_BANKS) {
 635                 printk(KERN_WARNING
 636                        "Ignoring memory bank 0x%08x size %dKB\n",
 637                         tag->u.mem.start, tag->u.mem.size / 1024);
 638                 return -EINVAL;
 639         }
 640         arm_add_memory(tag->u.mem.start, tag->u.mem.size);
 641         return 0;
 642 }
 643
 644 __tagtable(ATAG_MEM, parse_tag_mem32);
 645
 646 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
 647 struct screen_info screen_info = {
 648  .orig_video_lines      = 30,
 649  .orig_video_cols       = 80,
 650  .orig_video_mode       = 0,
 651  .orig_video_ega_bx     = 0,
 652  .orig_video_isVGA      = 1,
 653  .orig_video_points     = 8
 654 };
 655
 656 static int __init parse_tag_videotext(const struct tag *tag)
 657 {
 658         screen_info.orig_x            = tag->u.videotext.x;
 659         screen_info.orig_y            = tag->u.videotext.y;
 660         screen_info.orig_video_page   = tag->u.videotext.video_page;
 661         screen_info.orig_video_mode   = tag->u.videotext.video_mode;
 662         screen_info.orig_video_cols   = tag->u.videotext.video_cols;
 663         screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
 664         screen_info.orig_video_lines  = tag->u.videotext.video_lines;
 665         screen_info.orig_video_isVGA  = tag->u.videotext.video_isvga;
 666         screen_info.orig_video_points = tag->u.videotext.video_points;
 667         return 0;
 668 }
 669
 670 __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
 671 #endif
 672
 673 static int __init parse_tag_ramdisk(const struct tag *tag)
 674 {
 675         setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
 676                       (tag->u.ramdisk.flags & 2) == 0,
 677                       tag->u.ramdisk.start, tag->u.ramdisk.size);
 678         return 0;
 679 }
 680
 681 __tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
 682
 683 static int __init parse_tag_initrd(const struct tag *tag)
 684 {
 685         printk(KERN_WARNING "ATAG_INITRD is deprecated; "
 686                 "please update your bootloader.\n");
 687         phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
 688         phys_initrd_size = tag->u.initrd.size;
 689         return 0;
 690 }
 691
 692 __tagtable(ATAG_INITRD, parse_tag_initrd);
 693
 694 static int __init parse_tag_initrd2(const struct tag *tag)
 695 {
 696         phys_initrd_start = tag->u.initrd.start;
 697         phys_initrd_size = tag->u.initrd.size;
 698         return 0;
 699 }
 700
 701 __tagtable(ATAG_INITRD2, parse_tag_initrd2);
 702
 703 static int __init parse_tag_serialnr(const struct tag *tag)
 704 {
 705         system_serial_low = tag->u.serialnr.low;
 706         system_serial_high = tag->u.serialnr.high;
 707         return 0;
 708 }
 709
 710 __tagtable(ATAG_SERIAL, parse_tag_serialnr);
 711
 712 static int __init parse_tag_revision(const struct tag *tag)
 713 {
 714         system_rev = tag->u.revision.rev;
 715         return 0;
 716 }
 717
 718 __tagtable(ATAG_REVISION, parse_tag_revision);
 719
 720 static int __init parse_tag_cmdline(const struct tag *tag)
 721 {
 722         strlcpy(default_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE);
 723         return 0;
 724 }
 725
 726 __tagtable(ATAG_CMDLINE, parse_tag_cmdline);
 727
 728 /*
 729  * Scan the tag table for this tag, and call its parse function.
 730  * The tag table is built by the linker from all the __tagtable
 731  * declarations.
 732  */
 733 static int __init parse_tag(const struct tag *tag)
 734 {
 735         extern struct tagtable __tagtable_begin, __tagtable_end;
 736         struct tagtable *t;
 737
 738         for (t = &__tagtable_begin; t < &__tagtable_end; t++)
 739                 if (tag->hdr.tag == t->tag) {
 740                         t->parse(tag);
 741                         break;
 742                 }
 743
 744         return t < &__tagtable_end;
 745 }
 746
 747 /*
 748  * Parse all tags in the list, checking both the global and architecture
 749  * specific tag tables.
 750  */
 751 static void __init parse_tags(const struct tag *t)
 752 {
 753         for (; t->hdr.size; t = tag_next(t))
 754                 if (!parse_tag(t))
 755                         printk(KERN_WARNING
 756                                 "Ignoring unrecognised tag 0x%08x\n",
 757                                 t->hdr.tag);
 758 }
 759
 760 /*
 761  * This holds our defaults.
 762  */
 763 static struct init_tags {
 764         struct tag_header hdr1;
 765         struct tag_core   core;
 766         struct tag_header hdr2;
 767         struct tag_mem32  mem;
 768         struct tag_header hdr3;
 769 } init_tags __initdata = {
 770         { tag_size(tag_core), ATAG_CORE },
 771         { 1, PAGE_SIZE, 0xff },
 772         { tag_size(tag_mem32), ATAG_MEM },
 773         { MEM_SIZE, PHYS_OFFSET },
 774         { 0, ATAG_NONE }
 775 };
 776
 777 static void (*init_machine)(void) __initdata;
 778
 779 static int __init customize_machine(void)
 780 {
 781         /* customizes platform devices, or adds new ones */
 782         if (init_machine)
 783                 init_machine();
 784         return 0;
 785 }
 786 arch_initcall(customize_machine);
 787
 788 void __init setup_arch(char **cmdline_p)
 789 {
 790         struct tag *tags = (struct tag *)&init_tags;
 791         struct machine_desc *mdesc;
 792         char *from = default_command_line;
 793
 794         setup_processor();
 795         mdesc = setup_machine(machine_arch_type);
 796         machine_name = mdesc->name;
 797
 798         if (mdesc->soft_reboot)
 799                 reboot_setup("s");
 800
 801         if (__atags_pointer)
 802                 tags = phys_to_virt(__atags_pointer);
 803         else if (mdesc->boot_params)
 804                 tags = phys_to_virt(mdesc->boot_params);
 805
 806         /*
 807          * If we have the old style parameters, convert them to
 808          * a tag list.
 809          */
 810         if (tags->hdr.tag != ATAG_CORE)
 811                 convert_to_tag_list(tags);
 812         if (tags->hdr.tag != ATAG_CORE)
 813                 tags = (struct tag *)&init_tags;
 814
 815         if (mdesc->fixup)
 816                 mdesc->fixup(mdesc, tags, &from, &meminfo);
 817
 818         if (tags->hdr.tag == ATAG_CORE) {
 819                 if (meminfo.nr_banks != 0)
 820                         squash_mem_tags(tags);
 821                 save_atags(tags);
 822                 parse_tags(tags);
 823         }
 824
 825         init_mm.start_code = (unsigned long) &_text;
 826         init_mm.end_code   = (unsigned long) &_etext;
 827         init_mm.end_data   = (unsigned long) &_edata;
 828         init_mm.brk        = (unsigned long) &_end;
 829
 830         memcpy(boot_command_line, from, COMMAND_LINE_SIZE);
 831         boot_command_line[COMMAND_LINE_SIZE-1] = '\0';
 832         parse_cmdline(cmdline_p, from);
 833         paging_init(&meminfo, mdesc);
 834         request_standard_resources(&meminfo, mdesc);
 835
 836 #ifdef CONFIG_SMP
 837         smp_init_cpus();
 838 #endif
 839
 840         cpu_init();
 841
 842         /*
 843          * Set up various architecture-specific pointers
 844          */
 845         init_arch_irq = mdesc->init_irq;
 846         system_timer = mdesc->timer;
 847         init_machine = mdesc->init_machine;
 848
 849 #ifdef CONFIG_VT
 850 #if defined(CONFIG_VGA_CONSOLE)
 851         conswitchp = &vga_con;
 852 #elif defined(CONFIG_DUMMY_CONSOLE)
 853         conswitchp = &dummy_con;
 854 #endif
 855 #endif
 856 }
 857
 858
 859 static int __init topology_init(void)
 860 {
 861         int cpu;
 862
 863         for_each_possible_cpu(cpu) {
 864                 struct cpuinfo_arm *cpuinfo = &per_cpu(cpu_data, cpu);
 865                 cpuinfo->cpu.hotpluggable = 1;
 866                 register_cpu(&cpuinfo->cpu, cpu);
 867         }
 868
 869         return 0;
 870 }
 871
 872 subsys_initcall(topology_init);
 873
 874 static const char *hwcap_str[] = {
 875         "swp",
 876         "half",
 877         "thumb",
 878         "26bit",
 879         "fastmult",
 880         "fpa",
 881         "vfp",
 882         "edsp",
 883         "java",
 884         "iwmmxt",
 885         "crunch",
 886         NULL
 887 };
 888
 889 static void
 890 c_show_cache(struct seq_file *m, const char *type, unsigned int cache)
 891 {
 892         unsigned int mult = 2 + (CACHE_M(cache) ? 1 : 0);
 893
 894         seq_printf(m, "%s size\t\t: %d\n"
 895                       "%s assoc\t\t: %d\n"
 896                       "%s line length\t: %d\n"
 897                       "%s sets\t\t: %d\n",
 898                 type, mult << (8 + CACHE_SIZE(cache)),
 899                 type, (mult << CACHE_ASSOC(cache)) >> 1,
 900                 type, 8 << CACHE_LINE(cache),
 901                 type, 1 << (6 + CACHE_SIZE(cache) - CACHE_ASSOC(cache) -
 902                             CACHE_LINE(cache)));
 903 }
 904
 905 static int c_show(struct seq_file *m, void *v)
 906 {
 907         int i;
 908
 909         seq_printf(m, "Processor\t: %s rev %d (%s)\n",
 910                    cpu_name, (int)processor_id & 15, elf_platform);
 911
 912 #if defined(CONFIG_SMP)
 913         for_each_online_cpu(i) {
 914                 /*
 915                  * glibc reads /proc/cpuinfo to determine the number of
 916                  * online processors, looking for lines beginning with
 917                  * "processor".  Give glibc what it expects.
 918                  */
 919                 seq_printf(m, "processor\t: %d\n", i);
 920                 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
 921                            per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
 922                            (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
 923         }
 924 #else /* CONFIG_SMP */
 925         seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
 926                    loops_per_jiffy / (500000/HZ),
 927                    (loops_per_jiffy / (5000/HZ)) % 100);
 928 #endif
 929
 930         /* dump out the processor features */
 931         seq_puts(m, "Features\t: ");
 932
 933         for (i = 0; hwcap_str[i]; i++)
 934                 if (elf_hwcap & (1 << i))
 935                         seq_printf(m, "%s ", hwcap_str[i]);
 936
 937         seq_printf(m, "\nCPU implementer\t: 0x%02x\n", processor_id >> 24);
 938         seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);
 939
 940         if ((processor_id & 0x0008f000) == 0x00000000) {
 941                 /* pre-ARM7 */
 942                 seq_printf(m, "CPU part\t: %07x\n", processor_id >> 4);
 943         } else {
 944                 if ((processor_id & 0x0008f000) == 0x00007000) {
 945                         /* ARM7 */
 946                         seq_printf(m, "CPU variant\t: 0x%02x\n",
 947                                    (processor_id >> 16) & 127);
 948                 } else {
 949                         /* post-ARM7 */
 950                         seq_printf(m, "CPU variant\t: 0x%x\n",
 951                                    (processor_id >> 20) & 15);
 952                 }
 953                 seq_printf(m, "CPU part\t: 0x%03x\n",
 954                            (processor_id >> 4) & 0xfff);
 955         }
 956         seq_printf(m, "CPU revision\t: %d\n", processor_id & 15);
 957
 958         {
 959                 unsigned int cache_info = read_cpuid(CPUID_CACHETYPE);
 960                 if (cache_info != processor_id) {
 961                         seq_printf(m, "Cache type\t: %s\n"
 962                                       "Cache clean\t: %s\n"
 963                                       "Cache lockdown\t: %s\n"
 964                                       "Cache format\t: %s\n",
 965                                    cache_types[CACHE_TYPE(cache_info)],
 966                                    cache_clean[CACHE_TYPE(cache_info)],
 967                                    cache_lockdown[CACHE_TYPE(cache_info)],
 968                                    CACHE_S(cache_info) ? "Harvard" : "Unified");
 969
 970                         if (CACHE_S(cache_info)) {
 971                                 c_show_cache(m, "I", CACHE_ISIZE(cache_info));
 972                                 c_show_cache(m, "D", CACHE_DSIZE(cache_info));
 973                         } else {
 974                                 c_show_cache(m, "Cache", CACHE_ISIZE(cache_info));
 975                         }
 976                 }
 977         }
 978
 979         seq_puts(m, "\n");
 980
 981         seq_printf(m, "Hardware\t: %s\n", machine_name);
 982         seq_printf(m, "Revision\t: %04x\n", system_rev);
 983         seq_printf(m, "Serial\t\t: %08x%08x\n",
 984                    system_serial_high, system_serial_low);
 985
 986         return 0;
 987 }
 988
 989 static void *c_start(struct seq_file *m, loff_t *pos)
 990 {
 991         return *pos < 1 ? (void *)1 : NULL;
 992 }
 993
 994 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 995 {
 996         ++*pos;
 997         return NULL;
 998 }
 999
1000 static void c_stop(struct seq_file *m, void *v)
1001 {
1002 }
1003
1004 struct seq_operations cpuinfo_op = {
1005         .start  = c_start,
1006         .next   = c_next,
1007         .stop   = c_stop,
1008         .show   = c_show
1009 };