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