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/kexec.h>
  23 #include <linux/of_fdt.h>
  24 #include <linux/crash_dump.h>
  25 #include <linux/root_dev.h>
  26 #include <linux/cpu.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/smp.h>
  29 #include <linux/fs.h>
  30 #include <linux/proc_fs.h>
  31 #include <linux/memblock.h>
  32 #include <linux/bug.h>
  33 #include <linux/compiler.h>
  34
  35 #include <asm/unified.h>
  36 #include <asm/cpu.h>
  37 #include <asm/cputype.h>
  38 #include <asm/elf.h>
  39 #include <asm/procinfo.h>
  40 #include <asm/sections.h>
  41 #include <asm/setup.h>
  42 #include <asm/smp_plat.h>
  43 #include <asm/mach-types.h>
  44 #include <asm/cacheflush.h>
  45 #include <asm/cachetype.h>
  46 #include <asm/tlbflush.h>
  47 #include <asm/system.h>
  48
  49 #include <asm/prom.h>
  50 #include <asm/mach/arch.h>
  51 #include <asm/mach/irq.h>
  52 #include <asm/mach/time.h>
  53 #include <asm/traps.h>
  54 #include <asm/unwind.h>
  55
  56 #if defined(CONFIG_DEPRECATED_PARAM_STRUCT)
  57 #include "compat.h"
  58 #endif
  59 #include "atags.h"
  60 #include "tcm.h"
  61
  62 #ifndef MEM_SIZE
  63 #define MEM_SIZE        (16*1024*1024)
  64 #endif
  65
  66 #if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE)
  67 char fpe_type[8];
  68
  69 static int __init fpe_setup(char *line)
  70 {
  71         memcpy(fpe_type, line, 8);
  72         return 1;
  73 }
  74
  75 __setup("fpe=", fpe_setup);
  76 #endif
  77
  78 extern void paging_init(struct machine_desc *desc);
  79 extern void sanity_check_meminfo(void);
  80 extern void reboot_setup(char *str);
  81
  82 unsigned int processor_id;
  83 EXPORT_SYMBOL(processor_id);
  84 unsigned int __machine_arch_type __read_mostly;
  85 EXPORT_SYMBOL(__machine_arch_type);
  86 unsigned int cacheid __read_mostly;
  87 EXPORT_SYMBOL(cacheid);
  88
  89 unsigned int __atags_pointer __initdata;
  90
  91 unsigned int system_rev;
  92 EXPORT_SYMBOL(system_rev);
  93
  94 unsigned int system_serial_low;
  95 EXPORT_SYMBOL(system_serial_low);
  96
  97 unsigned int system_serial_high;
  98 EXPORT_SYMBOL(system_serial_high);
  99
 100 unsigned int elf_hwcap __read_mostly;
 101 EXPORT_SYMBOL(elf_hwcap);
 102
 103
 104 #ifdef MULTI_CPU
 105 struct processor processor __read_mostly;
 106 #endif
 107 #ifdef MULTI_TLB
 108 struct cpu_tlb_fns cpu_tlb __read_mostly;
 109 #endif
 110 #ifdef MULTI_USER
 111 struct cpu_user_fns cpu_user __read_mostly;
 112 #endif
 113 #ifdef MULTI_CACHE
 114 struct cpu_cache_fns cpu_cache __read_mostly;
 115 #endif
 116 #ifdef CONFIG_OUTER_CACHE
 117 struct outer_cache_fns outer_cache __read_mostly;
 118 EXPORT_SYMBOL(outer_cache);
 119 #endif
 120
 121 /*
 122  * Cached cpu_architecture() result for use by assembler code.
 123  * C code should use the cpu_architecture() function instead of accessing this
 124  * variable directly.
 125  */
 126 int __cpu_architecture __read_mostly = CPU_ARCH_UNKNOWN;
 127
 128 struct stack {
 129         u32 irq[3];
 130         u32 abt[3];
 131         u32 und[3];
 132 } ____cacheline_aligned;
 133
 134 static struct stack stacks[NR_CPUS];
 135
 136 char elf_platform[ELF_PLATFORM_SIZE];
 137 EXPORT_SYMBOL(elf_platform);
 138
 139 static const char *cpu_name;
 140 static const char *machine_name;
 141 static char __initdata cmd_line[COMMAND_LINE_SIZE];
 142 struct machine_desc *machine_desc __initdata;
 143
 144 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
 145 static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } };
 146 #define ENDIANNESS ((char)endian_test.l)
 147
 148 DEFINE_PER_CPU(struct cpuinfo_arm, cpu_data);
 149
 150 /*
 151  * Standard memory resources
 152  */
 153 static struct resource mem_res[] = {
 154         {
 155                 .name = "Video RAM",
 156                 .start = 0,
 157                 .end = 0,
 158                 .flags = IORESOURCE_MEM
 159         },
 160         {
 161                 .name = "Kernel text",
 162                 .start = 0,
 163                 .end = 0,
 164                 .flags = IORESOURCE_MEM
 165         },
 166         {
 167                 .name = "Kernel data",
 168                 .start = 0,
 169                 .end = 0,
 170                 .flags = IORESOURCE_MEM
 171         }
 172 };
 173
 174 #define video_ram   mem_res[0]
 175 #define kernel_code mem_res[1]
 176 #define kernel_data mem_res[2]
 177
 178 static struct resource io_res[] = {
 179         {
 180                 .name = "reserved",
 181                 .start = 0x3bc,
 182                 .end = 0x3be,
 183                 .flags = IORESOURCE_IO | IORESOURCE_BUSY
 184         },
 185         {
 186                 .name = "reserved",
 187                 .start = 0x378,
 188                 .end = 0x37f,
 189                 .flags = IORESOURCE_IO | IORESOURCE_BUSY
 190         },
 191         {
 192                 .name = "reserved",
 193                 .start = 0x278,
 194                 .end = 0x27f,
 195                 .flags = IORESOURCE_IO | IORESOURCE_BUSY
 196         }
 197 };
 198
 199 #define lp0 io_res[0]
 200 #define lp1 io_res[1]
 201 #define lp2 io_res[2]
 202
 203 static const char *proc_arch[] = {
 204         "undefined/unknown",
 205         "3",
 206         "4",
 207         "4T",
 208         "5",
 209         "5T",
 210         "5TE",
 211         "5TEJ",
 212         "6TEJ",
 213         "7",
 214         "?(11)",
 215         "?(12)",
 216         "?(13)",
 217         "?(14)",
 218         "?(15)",
 219         "?(16)",
 220         "?(17)",
 221 };
 222
 223 static int __get_cpu_architecture(void)
 224 {
 225         int cpu_arch;
 226
 227         if ((read_cpuid_id() & 0x0008f000) == 0) {
 228                 cpu_arch = CPU_ARCH_UNKNOWN;
 229         } else if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
 230                 cpu_arch = (read_cpuid_id() & (1 << 23)) ? CPU_ARCH_ARMv4T : CPU_ARCH_ARMv3;
 231         } else if ((read_cpuid_id() & 0x00080000) == 0x00000000) {
 232                 cpu_arch = (read_cpuid_id() >> 16) & 7;
 233                 if (cpu_arch)
 234                         cpu_arch += CPU_ARCH_ARMv3;
 235         } else if ((read_cpuid_id() & 0x000f0000) == 0x000f0000) {
 236                 unsigned int mmfr0;
 237
 238                 /* Revised CPUID format. Read the Memory Model Feature
 239                  * Register 0 and check for VMSAv7 or PMSAv7 */
 240                 asm("mrc        p15, 0, %0, c0, c1, 4"
 241                     : "=r" (mmfr0));
 242                 if ((mmfr0 & 0x0000000f) >= 0x00000003 ||
 243                     (mmfr0 & 0x000000f0) >= 0x00000030)
 244                         cpu_arch = CPU_ARCH_ARMv7;
 245                 else if ((mmfr0 & 0x0000000f) == 0x00000002 ||
 246                          (mmfr0 & 0x000000f0) == 0x00000020)
 247                         cpu_arch = CPU_ARCH_ARMv6;
 248                 else
 249                         cpu_arch = CPU_ARCH_UNKNOWN;
 250         } else
 251                 cpu_arch = CPU_ARCH_UNKNOWN;
 252
 253         return cpu_arch;
 254 }
 255
 256 int __pure cpu_architecture(void)
 257 {
 258         BUG_ON(__cpu_architecture == CPU_ARCH_UNKNOWN);
 259
 260         return __cpu_architecture;
 261 }
 262
 263 static int cpu_has_aliasing_icache(unsigned int arch)
 264 {
 265         int aliasing_icache;
 266         unsigned int id_reg, num_sets, line_size;
 267
 268         /* PIPT caches never alias. */
 269         if (icache_is_pipt())
 270                 return 0;
 271
 272         /* arch specifies the register format */
 273         switch (arch) {
 274         case CPU_ARCH_ARMv7:
 275                 asm("mcr        p15, 2, %0, c0, c0, 0 @ set CSSELR"
 276                     : /* No output operands */
 277                     : "r" (1));
 278                 isb();
 279                 asm("mrc        p15, 1, %0, c0, c0, 0 @ read CCSIDR"
 280                     : "=r" (id_reg));
 281                 line_size = 4 << ((id_reg & 0x7) + 2);
 282                 num_sets = ((id_reg >> 13) & 0x7fff) + 1;
 283                 aliasing_icache = (line_size * num_sets) > PAGE_SIZE;
 284                 break;
 285         case CPU_ARCH_ARMv6:
 286                 aliasing_icache = read_cpuid_cachetype() & (1 << 11);
 287                 break;
 288         default:
 289                 /* I-cache aliases will be handled by D-cache aliasing code */
 290                 aliasing_icache = 0;
 291         }
 292
 293         return aliasing_icache;
 294 }
 295
 296 static void __init cacheid_init(void)
 297 {
 298         unsigned int cachetype = read_cpuid_cachetype();
 299         unsigned int arch = cpu_architecture();
 300
 301         if (arch >= CPU_ARCH_ARMv6) {
 302                 if ((cachetype & (7 << 29)) == 4 << 29) {
 303                         /* ARMv7 register format */
 304                         arch = CPU_ARCH_ARMv7;
 305                         cacheid = CACHEID_VIPT_NONALIASING;
 306                         switch (cachetype & (3 << 14)) {
 307                         case (1 << 14):
 308                                 cacheid |= CACHEID_ASID_TAGGED;
 309                                 break;
 310                         case (3 << 14):
 311                                 cacheid |= CACHEID_PIPT;
 312                                 break;
 313                         }
 314                 } else {
 315                         arch = CPU_ARCH_ARMv6;
 316                         if (cachetype & (1 << 23))
 317                                 cacheid = CACHEID_VIPT_ALIASING;
 318                         else
 319                                 cacheid = CACHEID_VIPT_NONALIASING;
 320                 }
 321                 if (cpu_has_aliasing_icache(arch))
 322                         cacheid |= CACHEID_VIPT_I_ALIASING;
 323         } else {
 324                 cacheid = CACHEID_VIVT;
 325         }
 326
 327         printk("CPU: %s data cache, %s instruction cache\n",
 328                 cache_is_vivt() ? "VIVT" :
 329                 cache_is_vipt_aliasing() ? "VIPT aliasing" :
 330                 cache_is_vipt_nonaliasing() ? "PIPT / VIPT nonaliasing" : "unknown",
 331                 cache_is_vivt() ? "VIVT" :
 332                 icache_is_vivt_asid_tagged() ? "VIVT ASID tagged" :
 333                 icache_is_vipt_aliasing() ? "VIPT aliasing" :
 334                 icache_is_pipt() ? "PIPT" :
 335                 cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown");
 336 }
 337
 338 /*
 339  * These functions re-use the assembly code in head.S, which
 340  * already provide the required functionality.
 341  */
 342 extern struct proc_info_list *lookup_processor_type(unsigned int);
 343
 344 void __init early_print(const char *str, ...)
 345 {
 346         extern void printascii(const char *);
 347         char buf[256];
 348         va_list ap;
 349
 350         va_start(ap, str);
 351         vsnprintf(buf, sizeof(buf), str, ap);
 352         va_end(ap);
 353
 354 #ifdef CONFIG_DEBUG_LL
 355         printascii(buf);
 356 #endif
 357         printk("%s", buf);
 358 }
 359
 360 static void __init feat_v6_fixup(void)
 361 {
 362         int id = read_cpuid_id();
 363
 364         if ((id & 0xff0f0000) != 0x41070000)
 365                 return;
 366
 367         /*
 368          * HWCAP_TLS is available only on 1136 r1p0 and later,
 369          * see also kuser_get_tls_init.
 370          */
 371         if ((((id >> 4) & 0xfff) == 0xb36) && (((id >> 20) & 3) == 0))
 372                 elf_hwcap &= ~HWCAP_TLS;
 373 }
 374
 375 /*
 376  * cpu_init - initialise one CPU.
 377  *
 378  * cpu_init sets up the per-CPU stacks.
 379  */
 380 void cpu_init(void)
 381 {
 382         unsigned int cpu = smp_processor_id();
 383         struct stack *stk = &stacks[cpu];
 384
 385         if (cpu >= NR_CPUS) {
 386                 printk(KERN_CRIT "CPU%u: bad primary CPU number\n", cpu);
 387                 BUG();
 388         }
 389
 390         cpu_proc_init();
 391
 392         /*
 393          * Define the placement constraint for the inline asm directive below.
 394          * In Thumb-2, msr with an immediate value is not allowed.
 395          */
 396 #ifdef CONFIG_THUMB2_KERNEL
 397 #define PLC     "r"
 398 #else
 399 #define PLC     "I"
 400 #endif
 401
 402         /*
 403          * setup stacks for re-entrant exception handlers
 404          */
 405         __asm__ (
 406         "msr    cpsr_c, %1\n\t"
 407         "add    r14, %0, %2\n\t"
 408         "mov    sp, r14\n\t"
 409         "msr    cpsr_c, %3\n\t"
 410         "add    r14, %0, %4\n\t"
 411         "mov    sp, r14\n\t"
 412         "msr    cpsr_c, %5\n\t"
 413         "add    r14, %0, %6\n\t"
 414         "mov    sp, r14\n\t"
 415         "msr    cpsr_c, %7"
 416             :
 417             : "r" (stk),
 418               PLC (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
 419               "I" (offsetof(struct stack, irq[0])),
 420               PLC (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
 421               "I" (offsetof(struct stack, abt[0])),
 422               PLC (PSR_F_BIT | PSR_I_BIT | UND_MODE),
 423               "I" (offsetof(struct stack, und[0])),
 424               PLC (PSR_F_BIT | PSR_I_BIT | SVC_MODE)
 425             : "r14");
 426 }
 427
 428 static void __init setup_processor(void)
 429 {
 430         struct proc_info_list *list;
 431
 432         /*
 433          * locate processor in the list of supported processor
 434          * types.  The linker builds this table for us from the
 435          * entries in arch/arm/mm/proc-*.S
 436          */
 437         list = lookup_processor_type(read_cpuid_id());
 438         if (!list) {
 439                 printk("CPU configuration botched (ID %08x), unable "
 440                        "to continue.\n", read_cpuid_id());
 441                 while (1);
 442         }
 443
 444         cpu_name = list->cpu_name;
 445         __cpu_architecture = __get_cpu_architecture();
 446
 447 #ifdef MULTI_CPU
 448         processor = *list->proc;
 449 #endif
 450 #ifdef MULTI_TLB
 451         cpu_tlb = *list->tlb;
 452 #endif
 453 #ifdef MULTI_USER
 454         cpu_user = *list->user;
 455 #endif
 456 #ifdef MULTI_CACHE
 457         cpu_cache = *list->cache;
 458 #endif
 459
 460         printk("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n",
 461                cpu_name, read_cpuid_id(), read_cpuid_id() & 15,
 462                proc_arch[cpu_architecture()], cr_alignment);
 463
 464         sprintf(init_utsname()->machine, "%s%c", list->arch_name, ENDIANNESS);
 465         sprintf(elf_platform, "%s%c", list->elf_name, ENDIANNESS);
 466         elf_hwcap = list->elf_hwcap;
 467 #ifndef CONFIG_ARM_THUMB
 468         elf_hwcap &= ~HWCAP_THUMB;
 469 #endif
 470
 471         feat_v6_fixup();
 472
 473         cacheid_init();
 474         cpu_init();
 475 }
 476
 477 void __init dump_machine_table(void)
 478 {
 479         struct machine_desc *p;
 480
 481         early_print("Available machine support:\n\nID (hex)\tNAME\n");
 482         for_each_machine_desc(p)
 483                 early_print("%08x\t%s\n", p->nr, p->name);
 484
 485         early_print("\nPlease check your kernel config and/or bootloader.\n");
 486
 487         while (true)
 488                 /* can't use cpu_relax() here as it may require MMU setup */;
 489 }
 490
 491 int __init arm_add_memory(phys_addr_t start, unsigned long size)
 492 {
 493         struct membank *bank = &meminfo.bank[meminfo.nr_banks];
 494
 495         if (meminfo.nr_banks >= NR_BANKS) {
 496                 printk(KERN_CRIT "NR_BANKS too low, "
 497                         "ignoring memory at 0x%08llx\n", (long long)start);
 498                 return -EINVAL;
 499         }
 500
 501         /*
 502          * Ensure that start/size are aligned to a page boundary.
 503          * Size is appropriately rounded down, start is rounded up.
 504          */
 505         size -= start & ~PAGE_MASK;
 506         bank->start = PAGE_ALIGN(start);
 507         bank->size  = size & PAGE_MASK;
 508
 509         /*
 510          * Check whether this memory region has non-zero size or
 511          * invalid node number.
 512          */
 513         if (bank->size == 0)
 514                 return -EINVAL;
 515
 516         meminfo.nr_banks++;
 517         return 0;
 518 }
 519
 520 /*
 521  * Pick out the memory size.  We look for mem=size@start,
 522  * where start and size are "size[KkMm]"
 523  */
 524 static int __init early_mem(char *p)
 525 {
 526         static int usermem __initdata = 0;
 527         unsigned long size;
 528         phys_addr_t start;
 529         char *endp;
 530
 531         /*
 532          * If the user specifies memory size, we
 533          * blow away any automatically generated
 534          * size.
 535          */
 536         if (usermem == 0) {
 537                 usermem = 1;
 538                 meminfo.nr_banks = 0;
 539         }
 540
 541         start = PHYS_OFFSET;
 542         size  = memparse(p, &endp);
 543         if (*endp == '@')
 544                 start = memparse(endp + 1, NULL);
 545
 546         arm_add_memory(start, size);
 547
 548         return 0;
 549 }
 550 early_param("mem", early_mem);
 551
 552 static void __init
 553 setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
 554 {
 555 #ifdef CONFIG_BLK_DEV_RAM
 556         extern int rd_size, rd_image_start, rd_prompt, rd_doload;
 557
 558         rd_image_start = image_start;
 559         rd_prompt = prompt;
 560         rd_doload = doload;
 561
 562         if (rd_sz)
 563                 rd_size = rd_sz;
 564 #endif
 565 }
 566
 567 static void __init request_standard_resources(struct machine_desc *mdesc)
 568 {
 569         struct memblock_region *region;
 570         struct resource *res;
 571
 572         kernel_code.start   = virt_to_phys(_text);
 573         kernel_code.end     = virt_to_phys(_etext - 1);
 574         kernel_data.start   = virt_to_phys(_sdata);
 575         kernel_data.end     = virt_to_phys(_end - 1);
 576
 577         for_each_memblock(memory, region) {
 578                 res = alloc_bootmem_low(sizeof(*res));
 579                 res->name  = "System RAM";
 580                 res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
 581                 res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
 582                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 583
 584                 request_resource(&iomem_resource, res);
 585
 586                 if (kernel_code.start >= res->start &&
 587                     kernel_code.end <= res->end)
 588                         request_resource(res, &kernel_code);
 589                 if (kernel_data.start >= res->start &&
 590                     kernel_data.end <= res->end)
 591                         request_resource(res, &kernel_data);
 592         }
 593
 594         if (mdesc->video_start) {
 595                 video_ram.start = mdesc->video_start;
 596                 video_ram.end   = mdesc->video_end;
 597                 request_resource(&iomem_resource, &video_ram);
 598         }
 599
 600         /*
 601          * Some machines don't have the possibility of ever
 602          * possessing lp0, lp1 or lp2
 603          */
 604         if (mdesc->reserve_lp0)
 605                 request_resource(&ioport_resource, &lp0);
 606         if (mdesc->reserve_lp1)
 607                 request_resource(&ioport_resource, &lp1);
 608         if (mdesc->reserve_lp2)
 609                 request_resource(&ioport_resource, &lp2);
 610 }
 611
 612 /*
 613  *  Tag parsing.
 614  *
 615  * This is the new way of passing data to the kernel at boot time.  Rather
 616  * than passing a fixed inflexible structure to the kernel, we pass a list
 617  * of variable-sized tags to the kernel.  The first tag must be a ATAG_CORE
 618  * tag for the list to be recognised (to distinguish the tagged list from
 619  * a param_struct).  The list is terminated with a zero-length tag (this tag
 620  * is not parsed in any way).
 621  */
 622 static int __init parse_tag_core(const struct tag *tag)
 623 {
 624         if (tag->hdr.size > 2) {
 625                 if ((tag->u.core.flags & 1) == 0)
 626                         root_mountflags &= ~MS_RDONLY;
 627                 ROOT_DEV = old_decode_dev(tag->u.core.rootdev);
 628         }
 629         return 0;
 630 }
 631
 632 __tagtable(ATAG_CORE, parse_tag_core);
 633
 634 static int __init parse_tag_mem32(const struct tag *tag)
 635 {
 636         return arm_add_memory(tag->u.mem.start, tag->u.mem.size);
 637 }
 638
 639 __tagtable(ATAG_MEM, parse_tag_mem32);
 640
 641 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
 642 struct screen_info screen_info = {
 643  .orig_video_lines      = 30,
 644  .orig_video_cols       = 80,
 645  .orig_video_mode       = 0,
 646  .orig_video_ega_bx     = 0,
 647  .orig_video_isVGA      = 1,
 648  .orig_video_points     = 8
 649 };
 650
 651 static int __init parse_tag_videotext(const struct tag *tag)
 652 {
 653         screen_info.orig_x            = tag->u.videotext.x;
 654         screen_info.orig_y            = tag->u.videotext.y;
 655         screen_info.orig_video_page   = tag->u.videotext.video_page;
 656         screen_info.orig_video_mode   = tag->u.videotext.video_mode;
 657         screen_info.orig_video_cols   = tag->u.videotext.video_cols;
 658         screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
 659         screen_info.orig_video_lines  = tag->u.videotext.video_lines;
 660         screen_info.orig_video_isVGA  = tag->u.videotext.video_isvga;
 661         screen_info.orig_video_points = tag->u.videotext.video_points;
 662         return 0;
 663 }
 664
 665 __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
 666 #endif
 667
 668 static int __init parse_tag_ramdisk(const struct tag *tag)
 669 {
 670         setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
 671                       (tag->u.ramdisk.flags & 2) == 0,
 672                       tag->u.ramdisk.start, tag->u.ramdisk.size);
 673         return 0;
 674 }
 675
 676 __tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
 677
 678 static int __init parse_tag_serialnr(const struct tag *tag)
 679 {
 680         system_serial_low = tag->u.serialnr.low;
 681         system_serial_high = tag->u.serialnr.high;
 682         return 0;
 683 }
 684
 685 __tagtable(ATAG_SERIAL, parse_tag_serialnr);
 686
 687 static int __init parse_tag_revision(const struct tag *tag)
 688 {
 689         system_rev = tag->u.revision.rev;
 690         return 0;
 691 }
 692
 693 __tagtable(ATAG_REVISION, parse_tag_revision);
 694
 695 static int __init parse_tag_cmdline(const struct tag *tag)
 696 {
 697 #if defined(CONFIG_CMDLINE_EXTEND)
 698         strlcat(default_command_line, " ", COMMAND_LINE_SIZE);
 699         strlcat(default_command_line, tag->u.cmdline.cmdline,
 700                 COMMAND_LINE_SIZE);
 701 #elif defined(CONFIG_CMDLINE_FORCE)
 702         pr_warning("Ignoring tag cmdline (using the default kernel command line)\n");
 703 #else
 704         strlcpy(default_command_line, tag->u.cmdline.cmdline,
 705                 COMMAND_LINE_SIZE);
 706 #endif
 707         return 0;
 708 }
 709
 710 __tagtable(ATAG_CMDLINE, parse_tag_cmdline);
 711
 712 /*
 713  * Scan the tag table for this tag, and call its parse function.
 714  * The tag table is built by the linker from all the __tagtable
 715  * declarations.
 716  */
 717 static int __init parse_tag(const struct tag *tag)
 718 {
 719         extern struct tagtable __tagtable_begin, __tagtable_end;
 720         struct tagtable *t;
 721
 722         for (t = &__tagtable_begin; t < &__tagtable_end; t++)
 723                 if (tag->hdr.tag == t->tag) {
 724                         t->parse(tag);
 725                         break;
 726                 }
 727
 728         return t < &__tagtable_end;
 729 }
 730
 731 /*
 732  * Parse all tags in the list, checking both the global and architecture
 733  * specific tag tables.
 734  */
 735 static void __init parse_tags(const struct tag *t)
 736 {
 737         for (; t->hdr.size; t = tag_next(t))
 738                 if (!parse_tag(t))
 739                         printk(KERN_WARNING
 740                                 "Ignoring unrecognised tag 0x%08x\n",
 741                                 t->hdr.tag);
 742 }
 743
 744 /*
 745  * This holds our defaults.
 746  */
 747 static struct init_tags {
 748         struct tag_header hdr1;
 749         struct tag_core   core;
 750         struct tag_header hdr2;
 751         struct tag_mem32  mem;
 752         struct tag_header hdr3;
 753 } init_tags __initdata = {
 754         { tag_size(tag_core), ATAG_CORE },
 755         { 1, PAGE_SIZE, 0xff },
 756         { tag_size(tag_mem32), ATAG_MEM },
 757         { MEM_SIZE },
 758         { 0, ATAG_NONE }
 759 };
 760
 761 static int __init customize_machine(void)
 762 {
 763         /* customizes platform devices, or adds new ones */
 764         if (machine_desc->init_machine)
 765                 machine_desc->init_machine();
 766         return 0;
 767 }
 768 arch_initcall(customize_machine);
 769
 770 #ifdef CONFIG_KEXEC
 771 static inline unsigned long long get_total_mem(void)
 772 {
 773         unsigned long total;
 774
 775         total = max_low_pfn - min_low_pfn;
 776         return total << PAGE_SHIFT;
 777 }
 778
 779 /**
 780  * reserve_crashkernel() - reserves memory are for crash kernel
 781  *
 782  * This function reserves memory area given in "crashkernel=" kernel command
 783  * line parameter. The memory reserved is used by a dump capture kernel when
 784  * primary kernel is crashing.
 785  */
 786 static void __init reserve_crashkernel(void)
 787 {
 788         unsigned long long crash_size, crash_base;
 789         unsigned long long total_mem;
 790         int ret;
 791
 792         total_mem = get_total_mem();
 793         ret = parse_crashkernel(boot_command_line, total_mem,
 794                                 &crash_size, &crash_base);
 795         if (ret)
 796                 return;
 797
 798         ret = reserve_bootmem(crash_base, crash_size, BOOTMEM_EXCLUSIVE);
 799         if (ret < 0) {
 800                 printk(KERN_WARNING "crashkernel reservation failed - "
 801                        "memory is in use (0x%lx)\n", (unsigned long)crash_base);
 802                 return;
 803         }
 804
 805         printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
 806                "for crashkernel (System RAM: %ldMB)\n",
 807                (unsigned long)(crash_size >> 20),
 808                (unsigned long)(crash_base >> 20),
 809                (unsigned long)(total_mem >> 20));
 810
 811         crashk_res.start = crash_base;
 812         crashk_res.end = crash_base + crash_size - 1;
 813         insert_resource(&iomem_resource, &crashk_res);
 814 }
 815 #else
 816 static inline void reserve_crashkernel(void) {}
 817 #endif /* CONFIG_KEXEC */
 818
 819 static void __init squash_mem_tags(struct tag *tag)
 820 {
 821         for (; tag->hdr.size; tag = tag_next(tag))
 822                 if (tag->hdr.tag == ATAG_MEM)
 823                         tag->hdr.tag = ATAG_NONE;
 824 }
 825
 826 static struct machine_desc * __init setup_machine_tags(unsigned int nr)
 827 {
 828         struct tag *tags = (struct tag *)&init_tags;
 829         struct machine_desc *mdesc = NULL, *p;
 830         char *from = default_command_line;
 831
 832         init_tags.mem.start = PHYS_OFFSET;
 833
 834         /*
 835          * locate machine in the list of supported machines.
 836          */
 837         for_each_machine_desc(p)
 838                 if (nr == p->nr) {
 839                         printk("Machine: %s\n", p->name);
 840                         mdesc = p;
 841                         break;
 842                 }
 843
 844         if (!mdesc) {
 845                 early_print("\nError: unrecognized/unsupported machine ID"
 846                         " (r1 = 0x%08x).\n\n", nr);
 847                 dump_machine_table(); /* does not return */
 848         }
 849
 850         if (__atags_pointer)
 851                 tags = phys_to_virt(__atags_pointer);
 852         else if (mdesc->atag_offset)
 853                 tags = (void *)(PAGE_OFFSET + mdesc->atag_offset);
 854
 855 #if defined(CONFIG_DEPRECATED_PARAM_STRUCT)
 856         /*
 857          * If we have the old style parameters, convert them to
 858          * a tag list.
 859          */
 860         if (tags->hdr.tag != ATAG_CORE)
 861                 convert_to_tag_list(tags);
 862 #endif
 863
 864         if (tags->hdr.tag != ATAG_CORE) {
 865 #if defined(CONFIG_OF)
 866                 /*
 867                  * If CONFIG_OF is set, then assume this is a reasonably
 868                  * modern system that should pass boot parameters
 869                  */
 870                 early_print("Warning: Neither atags nor dtb found\n");
 871 #endif
 872                 tags = (struct tag *)&init_tags;
 873         }
 874
 875         if (mdesc->fixup)
 876                 mdesc->fixup(tags, &from, &meminfo);
 877
 878         if (tags->hdr.tag == ATAG_CORE) {
 879                 if (meminfo.nr_banks != 0)
 880                         squash_mem_tags(tags);
 881                 save_atags(tags);
 882                 parse_tags(tags);
 883         }
 884
 885         /* parse_early_param needs a boot_command_line */
 886         strlcpy(boot_command_line, from, COMMAND_LINE_SIZE);
 887
 888         return mdesc;
 889 }
 890
 891
 892 void __init setup_arch(char **cmdline_p)
 893 {
 894         struct machine_desc *mdesc;
 895
 896         unwind_init();
 897
 898         setup_processor();
 899         mdesc = setup_machine_fdt(__atags_pointer);
 900         if (!mdesc)
 901                 mdesc = setup_machine_tags(machine_arch_type);
 902         machine_desc = mdesc;
 903         machine_name = mdesc->name;
 904
 905         if (mdesc->soft_reboot)
 906                 reboot_setup("s");
 907
 908         init_mm.start_code = (unsigned long) _text;
 909         init_mm.end_code   = (unsigned long) _etext;
 910         init_mm.end_data   = (unsigned long) _edata;
 911         init_mm.brk        = (unsigned long) _end;
 912
 913         /* populate cmd_line too for later use, preserving boot_command_line */
 914         strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
 915         *cmdline_p = cmd_line;
 916
 917         parse_early_param();
 918
 919         sanity_check_meminfo();
 920         arm_memblock_init(&meminfo, mdesc);
 921
 922         paging_init(mdesc);
 923         request_standard_resources(mdesc);
 924
 925         unflatten_device_tree();
 926
 927 #ifdef CONFIG_SMP
 928         if (is_smp())
 929                 smp_init_cpus();
 930 #endif
 931         reserve_crashkernel();
 932
 933         tcm_init();
 934
 935 #ifdef CONFIG_ZONE_DMA
 936         if (mdesc->dma_zone_size) {
 937                 extern unsigned long arm_dma_zone_size;
 938                 arm_dma_zone_size = mdesc->dma_zone_size;
 939         }
 940 #endif
 941 #ifdef CONFIG_MULTI_IRQ_HANDLER
 942         handle_arch_irq = mdesc->handle_irq;
 943 #endif
 944
 945 #ifdef CONFIG_VT
 946 #if defined(CONFIG_VGA_CONSOLE)
 947         conswitchp = &vga_con;
 948 #elif defined(CONFIG_DUMMY_CONSOLE)
 949         conswitchp = &dummy_con;
 950 #endif
 951 #endif
 952         early_trap_init();
 953
 954         if (mdesc->init_early)
 955                 mdesc->init_early();
 956 }
 957
 958
 959 static int __init topology_init(void)
 960 {
 961         int cpu;
 962
 963         for_each_possible_cpu(cpu) {
 964                 struct cpuinfo_arm *cpuinfo = &per_cpu(cpu_data, cpu);
 965                 cpuinfo->cpu.hotpluggable = 1;
 966                 register_cpu(&cpuinfo->cpu, cpu);
 967         }
 968
 969         return 0;
 970 }
 971 subsys_initcall(topology_init);
 972
 973 #ifdef CONFIG_HAVE_PROC_CPU
 974 static int __init proc_cpu_init(void)
 975 {
 976         struct proc_dir_entry *res;
 977
 978         res = proc_mkdir("cpu", NULL);
 979         if (!res)
 980                 return -ENOMEM;
 981         return 0;
 982 }
 983 fs_initcall(proc_cpu_init);
 984 #endif
 985
 986 static const char *hwcap_str[] = {
 987         "swp",
 988         "half",
 989         "thumb",
 990         "26bit",
 991         "fastmult",
 992         "fpa",
 993         "vfp",
 994         "edsp",
 995         "java",
 996         "iwmmxt",
 997         "crunch",
 998         "thumbee",
 999         "neon",
1000         "vfpv3",
1001         "vfpv3d16",
1002         "tls",
1003         "vfpv4",
1004         "idiva",
1005         "idivt",
1006         NULL
1007 };
1008
1009 static int c_show(struct seq_file *m, void *v)
1010 {
1011         int i;
1012
1013         seq_printf(m, "Processor\t: %s rev %d (%s)\n",
1014                    cpu_name, read_cpuid_id() & 15, elf_platform);
1015
1016 #if defined(CONFIG_SMP)
1017         for_each_online_cpu(i) {
1018                 /*
1019                  * glibc reads /proc/cpuinfo to determine the number of
1020                  * online processors, looking for lines beginning with
1021                  * "processor".  Give glibc what it expects.
1022                  */
1023                 seq_printf(m, "processor\t: %d\n", i);
1024                 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
1025                            per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
1026                            (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
1027         }
1028 #else /* CONFIG_SMP */
1029         seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
1030                    loops_per_jiffy / (500000/HZ),
1031                    (loops_per_jiffy / (5000/HZ)) % 100);
1032 #endif
1033
1034         /* dump out the processor features */
1035         seq_puts(m, "Features\t: ");
1036
1037         for (i = 0; hwcap_str[i]; i++)
1038                 if (elf_hwcap & (1 << i))
1039                         seq_printf(m, "%s ", hwcap_str[i]);
1040
1041         seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
1042         seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);
1043
1044         if ((read_cpuid_id() & 0x0008f000) == 0x00000000) {
1045                 /* pre-ARM7 */
1046                 seq_printf(m, "CPU part\t: %07x\n", read_cpuid_id() >> 4);
1047         } else {
1048                 if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
1049                         /* ARM7 */
1050                         seq_printf(m, "CPU variant\t: 0x%02x\n",
1051                                    (read_cpuid_id() >> 16) & 127);
1052                 } else {
1053                         /* post-ARM7 */
1054                         seq_printf(m, "CPU variant\t: 0x%x\n",
1055                                    (read_cpuid_id() >> 20) & 15);
1056                 }
1057                 seq_printf(m, "CPU part\t: 0x%03x\n",
1058                            (read_cpuid_id() >> 4) & 0xfff);
1059         }
1060         seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15);
1061
1062         seq_puts(m, "\n");
1063
1064         seq_printf(m, "Hardware\t: %s\n", machine_name);
1065         seq_printf(m, "Revision\t: %04x\n", system_rev);
1066         seq_printf(m, "Serial\t\t: %08x%08x\n",
1067                    system_serial_high, system_serial_low);
1068
1069         return 0;
1070 }
1071
1072 static void *c_start(struct seq_file *m, loff_t *pos)
1073 {
1074         return *pos < 1 ? (void *)1 : NULL;
1075 }
1076
1077 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
1078 {
1079         ++*pos;
1080         return NULL;
1081 }
1082
1083 static void c_stop(struct seq_file *m, void *v)
1084 {
1085 }
1086
1087 const struct seq_operations cpuinfo_op = {
1088         .start  = c_start,
1089         .next   = c_next,
1090         .stop   = c_stop,
1091         .show   = c_show
1092 };