arch/sh/kernel/setup.c

   1 /*
   2  * arch/sh/kernel/setup.c
   3  *
   4  * This file handles the architecture-dependent parts of initialization
   5  *
   6  *  Copyright (C) 1999  Niibe Yutaka
   7  *  Copyright (C) 2002 - 2007 Paul Mundt
   8  */
   9 #include <linux/screen_info.h>
  10 #include <linux/ioport.h>
  11 #include <linux/init.h>
  12 #include <linux/initrd.h>
  13 #include <linux/bootmem.h>
  14 #include <linux/console.h>
  15 #include <linux/seq_file.h>
  16 #include <linux/root_dev.h>
  17 #include <linux/utsname.h>
  18 #include <linux/nodemask.h>
  19 #include <linux/cpu.h>
  20 #include <linux/pfn.h>
  21 #include <linux/fs.h>
  22 #include <linux/mm.h>
  23 #include <linux/kexec.h>
  24 #include <linux/module.h>
  25 #include <linux/smp.h>
  26 #include <linux/err.h>
  27 #include <linux/debugfs.h>
  28 #include <linux/crash_dump.h>
  29 #include <linux/mmzone.h>
  30 #include <linux/clk.h>
  31 #include <linux/delay.h>
  32 #include <linux/platform_device.h>
  33 #include <linux/lmb.h>
  34 #include <asm/uaccess.h>
  35 #include <asm/io.h>
  36 #include <asm/page.h>
  37 #include <asm/elf.h>
  38 #include <asm/sections.h>
  39 #include <asm/irq.h>
  40 #include <asm/setup.h>
  41 #include <asm/clock.h>
  42 #include <asm/smp.h>
  43 #include <asm/mmu_context.h>
  44
  45 /*
  46  * Initialize loops_per_jiffy as 10000000 (1000MIPS).
  47  * This value will be used at the very early stage of serial setup.
  48  * The bigger value means no problem.
  49  */
  50 struct sh_cpuinfo cpu_data[NR_CPUS] __read_mostly = {
  51         [0] = {
  52                 .type                   = CPU_SH_NONE,
  53                 .family                 = CPU_FAMILY_UNKNOWN,
  54                 .loops_per_jiffy        = 10000000,
  55         },
  56 };
  57 EXPORT_SYMBOL(cpu_data);
  58
  59 /*
  60  * The machine vector. First entry in .machvec.init, or clobbered by
  61  * sh_mv= on the command line, prior to .machvec.init teardown.
  62  */
  63 struct sh_machine_vector sh_mv = { .mv_name = "generic", };
  64 EXPORT_SYMBOL(sh_mv);
  65
  66 #ifdef CONFIG_VT
  67 struct screen_info screen_info;
  68 #endif
  69
  70 extern int root_mountflags;
  71
  72 #define RAMDISK_IMAGE_START_MASK        0x07FF
  73 #define RAMDISK_PROMPT_FLAG             0x8000
  74 #define RAMDISK_LOAD_FLAG               0x4000
  75
  76 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, };
  77
  78 static struct resource code_resource = {
  79         .name = "Kernel code",
  80         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  81 };
  82
  83 static struct resource data_resource = {
  84         .name = "Kernel data",
  85         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  86 };
  87
  88 static struct resource bss_resource = {
  89         .name   = "Kernel bss",
  90         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM,
  91 };
  92
  93 unsigned long memory_start;
  94 EXPORT_SYMBOL(memory_start);
  95 unsigned long memory_end = 0;
  96 EXPORT_SYMBOL(memory_end);
  97
  98 static struct resource mem_resources[MAX_NUMNODES];
  99
 100 int l1i_cache_shape, l1d_cache_shape, l2_cache_shape;
 101
 102 static int __init early_parse_mem(char *p)
 103 {
 104         unsigned long size;
 105
 106         memory_start = (unsigned long)__va(__MEMORY_START);
 107         size = memparse(p, &p);
 108
 109         if (size > __MEMORY_SIZE) {
 110                 printk(KERN_ERR
 111                         "Using mem= to increase the size of kernel memory "
 112                         "is not allowed.\n"
 113                         "  Recompile the kernel with the correct value for "
 114                         "CONFIG_MEMORY_SIZE.\n");
 115                 return 0;
 116         }
 117
 118         memory_end = memory_start + size;
 119
 120         return 0;
 121 }
 122 early_param("mem", early_parse_mem);
 123
 124 /*
 125  * Register fully available low RAM pages with the bootmem allocator.
 126  */
 127 static void __init register_bootmem_low_pages(void)
 128 {
 129         unsigned long curr_pfn, last_pfn, pages;
 130
 131         /*
 132          * We are rounding up the start address of usable memory:
 133          */
 134         curr_pfn = PFN_UP(__MEMORY_START);
 135
 136         /*
 137          * ... and at the end of the usable range downwards:
 138          */
 139         last_pfn = PFN_DOWN(__pa(memory_end));
 140
 141         if (last_pfn > max_low_pfn)
 142                 last_pfn = max_low_pfn;
 143
 144         pages = last_pfn - curr_pfn;
 145         free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(pages));
 146 }
 147
 148 #ifdef CONFIG_KEXEC
 149 static void __init reserve_crashkernel(void)
 150 {
 151         unsigned long long free_mem;
 152         unsigned long long crash_size, crash_base;
 153         void *vp;
 154         int ret;
 155
 156         free_mem = ((unsigned long long)max_low_pfn - min_low_pfn) << PAGE_SHIFT;
 157
 158         ret = parse_crashkernel(boot_command_line, free_mem,
 159                         &crash_size, &crash_base);
 160         if (ret == 0 && crash_size) {
 161                 if (crash_base <= 0) {
 162                         vp = alloc_bootmem_nopanic(crash_size);
 163                         if (!vp) {
 164                                 printk(KERN_INFO "crashkernel allocation "
 165                                        "failed\n");
 166                                 return;
 167                         }
 168                         crash_base = __pa(vp);
 169                 } else if (reserve_bootmem(crash_base, crash_size,
 170                                         BOOTMEM_EXCLUSIVE) < 0) {
 171                         printk(KERN_INFO "crashkernel reservation failed - "
 172                                         "memory is in use\n");
 173                         return;
 174                 }
 175
 176                 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
 177                                 "for crashkernel (System RAM: %ldMB)\n",
 178                                 (unsigned long)(crash_size >> 20),
 179                                 (unsigned long)(crash_base >> 20),
 180                                 (unsigned long)(free_mem >> 20));
 181                 crashk_res.start = crash_base;
 182                 crashk_res.end   = crash_base + crash_size - 1;
 183                 insert_resource(&iomem_resource, &crashk_res);
 184         }
 185 }
 186 #else
 187 static inline void __init reserve_crashkernel(void)
 188 {}
 189 #endif
 190
 191 static void __init check_for_initrd(void)
 192 {
 193 #ifdef CONFIG_BLK_DEV_INITRD
 194         unsigned long start, end;
 195
 196         /*
 197          * Check for the rare cases where boot loaders adhere to the boot
 198          * ABI.
 199          */
 200         if (!LOADER_TYPE || !INITRD_START || !INITRD_SIZE)
 201                 goto disable;
 202
 203         start = INITRD_START + __MEMORY_START;
 204         end = start + INITRD_SIZE;
 205
 206         if (unlikely(end <= start))
 207                 goto disable;
 208         if (unlikely(start & ~PAGE_MASK)) {
 209                 pr_err("initrd must be page aligned\n");
 210                 goto disable;
 211         }
 212
 213         if (unlikely(start < PAGE_OFFSET)) {
 214                 pr_err("initrd start < PAGE_OFFSET\n");
 215                 goto disable;
 216         }
 217
 218         if (unlikely(end > lmb_end_of_DRAM())) {
 219                 pr_err("initrd extends beyond end of memory "
 220                        "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 221                        end, (unsigned long)lmb_end_of_DRAM());
 222                 goto disable;
 223         }
 224
 225         /*
 226          * If we got this far inspite of the boot loader's best efforts
 227          * to the contrary, assume we actually have a valid initrd and
 228          * fix up the root dev.
 229          */
 230         ROOT_DEV = Root_RAM0;
 231
 232         /*
 233          * Address sanitization
 234          */
 235         initrd_start = (unsigned long)__va(__pa(start));
 236         initrd_end = initrd_start + INITRD_SIZE;
 237
 238         reserve_bootmem(__pa(initrd_start), INITRD_SIZE, BOOTMEM_DEFAULT);
 239
 240         return;
 241
 242 disable:
 243         pr_info("initrd disabled\n");
 244         initrd_start = initrd_end = 0;
 245 #endif
 246 }
 247
 248 void __cpuinit calibrate_delay(void)
 249 {
 250         struct clk *clk = clk_get(NULL, "cpu_clk");
 251
 252         if (IS_ERR(clk))
 253                 panic("Need a sane CPU clock definition!");
 254
 255         loops_per_jiffy = (clk_get_rate(clk) >> 1) / HZ;
 256
 257         printk(KERN_INFO "Calibrating delay loop (skipped)... "
 258                          "%lu.%02lu BogoMIPS PRESET (lpj=%lu)\n",
 259                          loops_per_jiffy/(500000/HZ),
 260                          (loops_per_jiffy/(5000/HZ)) % 100,
 261                          loops_per_jiffy);
 262 }
 263
 264 void __init __add_active_range(unsigned int nid, unsigned long start_pfn,
 265                                                 unsigned long end_pfn)
 266 {
 267         struct resource *res = &mem_resources[nid];
 268
 269         WARN_ON(res->name); /* max one active range per node for now */
 270
 271         res->name = "System RAM";
 272         res->start = start_pfn << PAGE_SHIFT;
 273         res->end = (end_pfn << PAGE_SHIFT) - 1;
 274         res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 275         if (request_resource(&iomem_resource, res)) {
 276                 pr_err("unable to request memory_resource 0x%lx 0x%lx\n",
 277                        start_pfn, end_pfn);
 278                 return;
 279         }
 280
 281         /*
 282          *  We don't know which RAM region contains kernel data,
 283          *  so we try it repeatedly and let the resource manager
 284          *  test it.
 285          */
 286         request_resource(res, &code_resource);
 287         request_resource(res, &data_resource);
 288         request_resource(res, &bss_resource);
 289
 290         add_active_range(nid, start_pfn, end_pfn);
 291 }
 292
 293 void __init setup_bootmem_allocator(unsigned long free_pfn)
 294 {
 295         unsigned long bootmap_size;
 296         unsigned long bootmap_pages, bootmem_paddr;
 297         u64 total_pages = (lmb_end_of_DRAM() - __MEMORY_START) >> PAGE_SHIFT;
 298         int i;
 299
 300         bootmap_pages = bootmem_bootmap_pages(total_pages);
 301
 302         bootmem_paddr = lmb_alloc(bootmap_pages << PAGE_SHIFT, PAGE_SIZE);
 303
 304         /*
 305          * Find a proper area for the bootmem bitmap. After this
 306          * bootstrap step all allocations (until the page allocator
 307          * is intact) must be done via bootmem_alloc().
 308          */
 309         bootmap_size = init_bootmem_node(NODE_DATA(0),
 310                                          bootmem_paddr >> PAGE_SHIFT,
 311                                          min_low_pfn, max_low_pfn);
 312
 313         /* Add active regions with valid PFNs. */
 314         for (i = 0; i < lmb.memory.cnt; i++) {
 315                 unsigned long start_pfn, end_pfn;
 316                 start_pfn = lmb.memory.region[i].base >> PAGE_SHIFT;
 317                 end_pfn = start_pfn + lmb_size_pages(&lmb.memory, i);
 318                 __add_active_range(0, start_pfn, end_pfn);
 319         }
 320
 321         /*
 322          * Add all physical memory to the bootmem map and mark each
 323          * area as present.
 324          */
 325         register_bootmem_low_pages();
 326
 327         /* Reserve the sections we're already using. */
 328         for (i = 0; i < lmb.reserved.cnt; i++)
 329                 reserve_bootmem(lmb.reserved.region[i].base,
 330                                 lmb_size_bytes(&lmb.reserved, i),
 331                                 BOOTMEM_DEFAULT);
 332
 333         node_set_online(0);
 334
 335         sparse_memory_present_with_active_regions(0);
 336
 337         check_for_initrd();
 338
 339         reserve_crashkernel();
 340 }
 341
 342 #ifndef CONFIG_NEED_MULTIPLE_NODES
 343 static void __init setup_memory(void)
 344 {
 345         unsigned long start_pfn;
 346         u64 base = min_low_pfn << PAGE_SHIFT;
 347         u64 size = (max_low_pfn << PAGE_SHIFT) - base;
 348
 349         /*
 350          * Partially used pages are not usable - thus
 351          * we are rounding upwards:
 352          */
 353         start_pfn = PFN_UP(__pa(_end));
 354
 355         lmb_add(base, size);
 356
 357         /*
 358          * Reserve the kernel text and
 359          * Reserve the bootmem bitmap. We do this in two steps (first step
 360          * was init_bootmem()), because this catches the (definitely buggy)
 361          * case of us accidentally initializing the bootmem allocator with
 362          * an invalid RAM area.
 363          */
 364         lmb_reserve(__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET,
 365                     (PFN_PHYS(start_pfn) + PAGE_SIZE - 1) -
 366                     (__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET));
 367
 368         /*
 369          * Reserve physical pages below CONFIG_ZERO_PAGE_OFFSET.
 370          */
 371         if (CONFIG_ZERO_PAGE_OFFSET != 0)
 372                 lmb_reserve(__MEMORY_START, CONFIG_ZERO_PAGE_OFFSET);
 373
 374         lmb_analyze();
 375         lmb_dump_all();
 376
 377         setup_bootmem_allocator(start_pfn);
 378 }
 379 #else
 380 extern void __init setup_memory(void);
 381 #endif
 382
 383 /*
 384  * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
 385  * is_kdump_kernel() to determine if we are booting after a panic. Hence
 386  * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
 387  */
 388 #ifdef CONFIG_CRASH_DUMP
 389 /* elfcorehdr= specifies the location of elf core header
 390  * stored by the crashed kernel.
 391  */
 392 static int __init parse_elfcorehdr(char *arg)
 393 {
 394         if (!arg)
 395                 return -EINVAL;
 396         elfcorehdr_addr = memparse(arg, &arg);
 397         return 0;
 398 }
 399 early_param("elfcorehdr", parse_elfcorehdr);
 400 #endif
 401
 402 void __init __attribute__ ((weak)) plat_early_device_setup(void)
 403 {
 404 }
 405
 406 void __init setup_arch(char **cmdline_p)
 407 {
 408         enable_mmu();
 409
 410         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
 411
 412         printk(KERN_NOTICE "Boot params:\n"
 413                            "... MOUNT_ROOT_RDONLY - %08lx\n"
 414                            "... RAMDISK_FLAGS     - %08lx\n"
 415                            "... ORIG_ROOT_DEV     - %08lx\n"
 416                            "... LOADER_TYPE       - %08lx\n"
 417                            "... INITRD_START      - %08lx\n"
 418                            "... INITRD_SIZE       - %08lx\n",
 419                            MOUNT_ROOT_RDONLY, RAMDISK_FLAGS,
 420                            ORIG_ROOT_DEV, LOADER_TYPE,
 421                            INITRD_START, INITRD_SIZE);
 422
 423 #ifdef CONFIG_BLK_DEV_RAM
 424         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
 425         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
 426         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
 427 #endif
 428
 429         if (!MOUNT_ROOT_RDONLY)
 430                 root_mountflags &= ~MS_RDONLY;
 431         init_mm.start_code = (unsigned long) _text;
 432         init_mm.end_code = (unsigned long) _etext;
 433         init_mm.end_data = (unsigned long) _edata;
 434         init_mm.brk = (unsigned long) _end;
 435
 436         code_resource.start = virt_to_phys(_text);
 437         code_resource.end = virt_to_phys(_etext)-1;
 438         data_resource.start = virt_to_phys(_etext);
 439         data_resource.end = virt_to_phys(_edata)-1;
 440         bss_resource.start = virt_to_phys(__bss_start);
 441         bss_resource.end = virt_to_phys(_ebss)-1;
 442
 443         memory_start = (unsigned long)__va(__MEMORY_START);
 444         if (!memory_end)
 445                 memory_end = memory_start + __MEMORY_SIZE;
 446
 447 #ifdef CONFIG_CMDLINE_OVERWRITE
 448         strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
 449 #else
 450         strlcpy(command_line, COMMAND_LINE, sizeof(command_line));
 451 #ifdef CONFIG_CMDLINE_EXTEND
 452         strlcat(command_line, " ", sizeof(command_line));
 453         strlcat(command_line, CONFIG_CMDLINE, sizeof(command_line));
 454 #endif
 455 #endif
 456
 457         /* Save unparsed command line copy for /proc/cmdline */
 458         memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 459         *cmdline_p = command_line;
 460
 461         parse_early_param();
 462
 463         uncached_init();
 464
 465         plat_early_device_setup();
 466
 467         /* Let earlyprintk output early console messages */
 468         early_platform_driver_probe("earlyprintk", 1, 1);
 469
 470         sh_mv_setup();
 471
 472         /*
 473          * Find the highest page frame number we have available
 474          */
 475         max_pfn = PFN_DOWN(__pa(memory_end));
 476
 477         /*
 478          * Determine low and high memory ranges:
 479          */
 480         max_low_pfn = max_pfn;
 481         min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
 482
 483         nodes_clear(node_online_map);
 484
 485         pmb_init();
 486         lmb_init();
 487         setup_memory();
 488         sparse_init();
 489
 490 #ifdef CONFIG_DUMMY_CONSOLE
 491         conswitchp = &dummy_con;
 492 #endif
 493         paging_init();
 494
 495         ioremap_fixed_init();
 496
 497         /* Perform the machine specific initialisation */
 498         if (likely(sh_mv.mv_setup))
 499                 sh_mv.mv_setup(cmdline_p);
 500
 501         plat_smp_setup();
 502 }
 503
 504 /* processor boot mode configuration */
 505 int generic_mode_pins(void)
 506 {
 507         pr_warning("generic_mode_pins(): missing mode pin configuration\n");
 508         return 0;
 509 }
 510
 511 int test_mode_pin(int pin)
 512 {
 513         return sh_mv.mv_mode_pins() & pin;
 514 }
 515
 516 static const char *cpu_name[] = {
 517         [CPU_SH7201]    = "SH7201",
 518         [CPU_SH7203]    = "SH7203",     [CPU_SH7263]    = "SH7263",
 519         [CPU_SH7206]    = "SH7206",     [CPU_SH7619]    = "SH7619",
 520         [CPU_SH7705]    = "SH7705",     [CPU_SH7706]    = "SH7706",
 521         [CPU_SH7707]    = "SH7707",     [CPU_SH7708]    = "SH7708",
 522         [CPU_SH7709]    = "SH7709",     [CPU_SH7710]    = "SH7710",
 523         [CPU_SH7712]    = "SH7712",     [CPU_SH7720]    = "SH7720",
 524         [CPU_SH7721]    = "SH7721",     [CPU_SH7729]    = "SH7729",
 525         [CPU_SH7750]    = "SH7750",     [CPU_SH7750S]   = "SH7750S",
 526         [CPU_SH7750R]   = "SH7750R",    [CPU_SH7751]    = "SH7751",
 527         [CPU_SH7751R]   = "SH7751R",    [CPU_SH7760]    = "SH7760",
 528         [CPU_SH4_202]   = "SH4-202",    [CPU_SH4_501]   = "SH4-501",
 529         [CPU_SH7763]    = "SH7763",     [CPU_SH7770]    = "SH7770",
 530         [CPU_SH7780]    = "SH7780",     [CPU_SH7781]    = "SH7781",
 531         [CPU_SH7343]    = "SH7343",     [CPU_SH7785]    = "SH7785",
 532         [CPU_SH7786]    = "SH7786",     [CPU_SH7757]    = "SH7757",
 533         [CPU_SH7722]    = "SH7722",     [CPU_SHX3]      = "SH-X3",
 534         [CPU_SH5_101]   = "SH5-101",    [CPU_SH5_103]   = "SH5-103",
 535         [CPU_MXG]       = "MX-G",       [CPU_SH7723]    = "SH7723",
 536         [CPU_SH7366]    = "SH7366",     [CPU_SH7724]    = "SH7724",
 537         [CPU_SH_NONE]   = "Unknown"
 538 };
 539
 540 const char *get_cpu_subtype(struct sh_cpuinfo *c)
 541 {
 542         return cpu_name[c->type];
 543 }
 544 EXPORT_SYMBOL(get_cpu_subtype);
 545
 546 #ifdef CONFIG_PROC_FS
 547 /* Symbolic CPU flags, keep in sync with asm/cpu-features.h */
 548 static const char *cpu_flags[] = {
 549         "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr",
 550         "ptea", "llsc", "l2", "op32", "pteaex", NULL
 551 };
 552
 553 static void show_cpuflags(struct seq_file *m, struct sh_cpuinfo *c)
 554 {
 555         unsigned long i;
 556
 557         seq_printf(m, "cpu flags\t:");
 558
 559         if (!c->flags) {
 560                 seq_printf(m, " %s\n", cpu_flags[0]);
 561                 return;
 562         }
 563
 564         for (i = 0; cpu_flags[i]; i++)
 565                 if ((c->flags & (1 << i)))
 566                         seq_printf(m, " %s", cpu_flags[i+1]);
 567
 568         seq_printf(m, "\n");
 569 }
 570
 571 static void show_cacheinfo(struct seq_file *m, const char *type,
 572                            struct cache_info info)
 573 {
 574         unsigned int cache_size;
 575
 576         cache_size = info.ways * info.sets * info.linesz;
 577
 578         seq_printf(m, "%s size\t: %2dKiB (%d-way)\n",
 579                    type, cache_size >> 10, info.ways);
 580 }
 581
 582 /*
 583  *      Get CPU information for use by the procfs.
 584  */
 585 static int show_cpuinfo(struct seq_file *m, void *v)
 586 {
 587         struct sh_cpuinfo *c = v;
 588         unsigned int cpu = c - cpu_data;
 589
 590         if (!cpu_online(cpu))
 591                 return 0;
 592
 593         if (cpu == 0)
 594                 seq_printf(m, "machine\t\t: %s\n", get_system_type());
 595         else
 596                 seq_printf(m, "\n");
 597
 598         seq_printf(m, "processor\t: %d\n", cpu);
 599         seq_printf(m, "cpu family\t: %s\n", init_utsname()->machine);
 600         seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype(c));
 601         if (c->cut_major == -1)
 602                 seq_printf(m, "cut\t\t: unknown\n");
 603         else if (c->cut_minor == -1)
 604                 seq_printf(m, "cut\t\t: %d.x\n", c->cut_major);
 605         else
 606                 seq_printf(m, "cut\t\t: %d.%d\n", c->cut_major, c->cut_minor);
 607
 608         show_cpuflags(m, c);
 609
 610         seq_printf(m, "cache type\t: ");
 611
 612         /*
 613          * Check for what type of cache we have, we support both the
 614          * unified cache on the SH-2 and SH-3, as well as the harvard
 615          * style cache on the SH-4.
 616          */
 617         if (c->icache.flags & SH_CACHE_COMBINED) {
 618                 seq_printf(m, "unified\n");
 619                 show_cacheinfo(m, "cache", c->icache);
 620         } else {
 621                 seq_printf(m, "split (harvard)\n");
 622                 show_cacheinfo(m, "icache", c->icache);
 623                 show_cacheinfo(m, "dcache", c->dcache);
 624         }
 625
 626         /* Optional secondary cache */
 627         if (c->flags & CPU_HAS_L2_CACHE)
 628                 show_cacheinfo(m, "scache", c->scache);
 629
 630         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 631                      c->loops_per_jiffy/(500000/HZ),
 632                      (c->loops_per_jiffy/(5000/HZ)) % 100);
 633
 634         return 0;
 635 }
 636
 637 static void *c_start(struct seq_file *m, loff_t *pos)
 638 {
 639         return *pos < NR_CPUS ? cpu_data + *pos : NULL;
 640 }
 641 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 642 {
 643         ++*pos;
 644         return c_start(m, pos);
 645 }
 646 static void c_stop(struct seq_file *m, void *v)
 647 {
 648 }
 649 const struct seq_operations cpuinfo_op = {
 650         .start  = c_start,
 651         .next   = c_next,
 652         .stop   = c_stop,
 653         .show   = show_cpuinfo,
 654 };
 655 #endif /* CONFIG_PROC_FS */
 656
 657 struct dentry *sh_debugfs_root;
 658
 659 static int __init sh_debugfs_init(void)
 660 {
 661         sh_debugfs_root = debugfs_create_dir("sh", NULL);
 662         if (!sh_debugfs_root)
 663                 return -ENOMEM;
 664         if (IS_ERR(sh_debugfs_root))
 665                 return PTR_ERR(sh_debugfs_root);
 666
 667         return 0;
 668 }
 669 arch_initcall(sh_debugfs_init);