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 <asm/uaccess.h>
  26 #include <asm/io.h>
  27 #include <asm/page.h>
  28 #include <asm/sections.h>
  29 #include <asm/irq.h>
  30 #include <asm/setup.h>
  31 #include <asm/clock.h>
  32 #include <asm/mmu_context.h>
  33
  34 extern void * __rd_start, * __rd_end;
  35
  36 /*
  37  * Machine setup..
  38  */
  39
  40 /*
  41  * Initialize loops_per_jiffy as 10000000 (1000MIPS).
  42  * This value will be used at the very early stage of serial setup.
  43  * The bigger value means no problem.
  44  */
  45 struct sh_cpuinfo cpu_data[NR_CPUS] __read_mostly = {
  46         [0] = {
  47                 .type                   = CPU_SH_NONE,
  48                 .loops_per_jiffy        = 10000000,
  49         },
  50 };
  51 EXPORT_SYMBOL(cpu_data);
  52
  53 /*
  54  * The machine vector. First entry in .machvec.init, or clobbered by
  55  * sh_mv= on the command line, prior to .machvec.init teardown.
  56  */
  57 struct sh_machine_vector sh_mv = { .mv_name = "generic", };
  58
  59 #ifdef CONFIG_VT
  60 struct screen_info screen_info;
  61 #endif
  62
  63 extern int root_mountflags;
  64
  65 /*
  66  * This is set up by the setup-routine at boot-time
  67  */
  68 #define PARAM   ((unsigned char *)empty_zero_page)
  69
  70 #define MOUNT_ROOT_RDONLY (*(unsigned long *) (PARAM+0x000))
  71 #define RAMDISK_FLAGS (*(unsigned long *) (PARAM+0x004))
  72 #define ORIG_ROOT_DEV (*(unsigned long *) (PARAM+0x008))
  73 #define LOADER_TYPE (*(unsigned long *) (PARAM+0x00c))
  74 #define INITRD_START (*(unsigned long *) (PARAM+0x010))
  75 #define INITRD_SIZE (*(unsigned long *) (PARAM+0x014))
  76 /* ... */
  77 #define COMMAND_LINE ((char *) (PARAM+0x100))
  78
  79 #define RAMDISK_IMAGE_START_MASK        0x07FF
  80 #define RAMDISK_PROMPT_FLAG             0x8000
  81 #define RAMDISK_LOAD_FLAG               0x4000
  82
  83 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, };
  84
  85 static struct resource code_resource = { .name = "Kernel code", };
  86 static struct resource data_resource = { .name = "Kernel data", };
  87
  88 unsigned long memory_start;
  89 EXPORT_SYMBOL(memory_start);
  90
  91 unsigned long memory_end;
  92 EXPORT_SYMBOL(memory_end);
  93
  94 static int __init early_parse_mem(char *p)
  95 {
  96         unsigned long size;
  97
  98         memory_start = (unsigned long)PAGE_OFFSET+__MEMORY_START;
  99         size = memparse(p, &p);
 100         memory_end = memory_start + size;
 101
 102         return 0;
 103 }
 104 early_param("mem", early_parse_mem);
 105
 106 /*
 107  * Register fully available low RAM pages with the bootmem allocator.
 108  */
 109 static void __init register_bootmem_low_pages(void)
 110 {
 111         unsigned long curr_pfn, last_pfn, pages;
 112
 113         /*
 114          * We are rounding up the start address of usable memory:
 115          */
 116         curr_pfn = PFN_UP(__MEMORY_START);
 117
 118         /*
 119          * ... and at the end of the usable range downwards:
 120          */
 121         last_pfn = PFN_DOWN(__pa(memory_end));
 122
 123         if (last_pfn > max_low_pfn)
 124                 last_pfn = max_low_pfn;
 125
 126         pages = last_pfn - curr_pfn;
 127         free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(pages));
 128 }
 129
 130 void __init setup_bootmem_allocator(unsigned long free_pfn)
 131 {
 132         unsigned long bootmap_size;
 133
 134         /*
 135          * Find a proper area for the bootmem bitmap. After this
 136          * bootstrap step all allocations (until the page allocator
 137          * is intact) must be done via bootmem_alloc().
 138          */
 139         bootmap_size = init_bootmem_node(NODE_DATA(0), free_pfn,
 140                                          min_low_pfn, max_low_pfn);
 141
 142         add_active_range(0, min_low_pfn, max_low_pfn);
 143         register_bootmem_low_pages();
 144
 145         node_set_online(0);
 146
 147         /*
 148          * Reserve the kernel text and
 149          * Reserve the bootmem bitmap. We do this in two steps (first step
 150          * was init_bootmem()), because this catches the (definitely buggy)
 151          * case of us accidentally initializing the bootmem allocator with
 152          * an invalid RAM area.
 153          */
 154         reserve_bootmem(__MEMORY_START+PAGE_SIZE,
 155                 (PFN_PHYS(free_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START);
 156
 157         /*
 158          * reserve physical page 0 - it's a special BIOS page on many boxes,
 159          * enabling clean reboots, SMP operation, laptop functions.
 160          */
 161         reserve_bootmem(__MEMORY_START, PAGE_SIZE);
 162
 163         sparse_memory_present_with_active_regions(0);
 164
 165 #ifdef CONFIG_BLK_DEV_INITRD
 166         ROOT_DEV = MKDEV(RAMDISK_MAJOR, 0);
 167         if (&__rd_start != &__rd_end) {
 168                 LOADER_TYPE = 1;
 169                 INITRD_START = PHYSADDR((unsigned long)&__rd_start) -
 170                                         __MEMORY_START;
 171                 INITRD_SIZE = (unsigned long)&__rd_end -
 172                               (unsigned long)&__rd_start;
 173         }
 174
 175         if (LOADER_TYPE && INITRD_START) {
 176                 if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
 177                         reserve_bootmem(INITRD_START + __MEMORY_START,
 178                                         INITRD_SIZE);
 179                         initrd_start = INITRD_START + PAGE_OFFSET +
 180                                         __MEMORY_START;
 181                         initrd_end = initrd_start + INITRD_SIZE;
 182                 } else {
 183                         printk("initrd extends beyond end of memory "
 184                             "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 185                                     INITRD_START + INITRD_SIZE,
 186                                     max_low_pfn << PAGE_SHIFT);
 187                         initrd_start = 0;
 188                 }
 189         }
 190 #endif
 191 #ifdef CONFIG_KEXEC
 192         if (crashk_res.start != crashk_res.end)
 193                 reserve_bootmem(crashk_res.start,
 194                         crashk_res.end - crashk_res.start + 1);
 195 #endif
 196 }
 197
 198 #ifndef CONFIG_NEED_MULTIPLE_NODES
 199 static void __init setup_memory(void)
 200 {
 201         unsigned long start_pfn;
 202
 203         /*
 204          * Partially used pages are not usable - thus
 205          * we are rounding upwards:
 206          */
 207         start_pfn = PFN_UP(__pa(_end));
 208         setup_bootmem_allocator(start_pfn);
 209 }
 210 #else
 211 extern void __init setup_memory(void);
 212 #endif
 213
 214 void __init setup_arch(char **cmdline_p)
 215 {
 216         enable_mmu();
 217
 218         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
 219
 220 #ifdef CONFIG_BLK_DEV_RAM
 221         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
 222         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
 223         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
 224 #endif
 225
 226         if (!MOUNT_ROOT_RDONLY)
 227                 root_mountflags &= ~MS_RDONLY;
 228         init_mm.start_code = (unsigned long) _text;
 229         init_mm.end_code = (unsigned long) _etext;
 230         init_mm.end_data = (unsigned long) _edata;
 231         init_mm.brk = (unsigned long) _end;
 232
 233         code_resource.start = virt_to_phys(_text);
 234         code_resource.end = virt_to_phys(_etext)-1;
 235         data_resource.start = virt_to_phys(_etext);
 236         data_resource.end = virt_to_phys(_edata)-1;
 237
 238         memory_start = (unsigned long)PAGE_OFFSET+__MEMORY_START;
 239         memory_end = memory_start + __MEMORY_SIZE;
 240
 241 #ifdef CONFIG_CMDLINE_BOOL
 242         strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
 243 #else
 244         strlcpy(command_line, COMMAND_LINE, sizeof(command_line));
 245 #endif
 246
 247         /* Save unparsed command line copy for /proc/cmdline */
 248         memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 249         *cmdline_p = command_line;
 250
 251         parse_early_param();
 252
 253         sh_mv_setup();
 254
 255         /*
 256          * Find the highest page frame number we have available
 257          */
 258         max_pfn = PFN_DOWN(__pa(memory_end));
 259
 260         /*
 261          * Determine low and high memory ranges:
 262          */
 263         max_low_pfn = max_pfn;
 264         min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
 265
 266         nodes_clear(node_online_map);
 267
 268         /* Setup bootmem with available RAM */
 269         setup_memory();
 270         sparse_init();
 271
 272 #ifdef CONFIG_DUMMY_CONSOLE
 273         conswitchp = &dummy_con;
 274 #endif
 275
 276         /* Perform the machine specific initialisation */
 277         if (likely(sh_mv.mv_setup))
 278                 sh_mv.mv_setup(cmdline_p);
 279
 280         paging_init();
 281 }
 282
 283 static const char *cpu_name[] = {
 284         [CPU_SH7206]    = "SH7206",     [CPU_SH7619]    = "SH7619",
 285         [CPU_SH7705]    = "SH7705",     [CPU_SH7706]    = "SH7706",
 286         [CPU_SH7707]    = "SH7707",     [CPU_SH7708]    = "SH7708",
 287         [CPU_SH7709]    = "SH7709",     [CPU_SH7710]    = "SH7710",
 288         [CPU_SH7712]    = "SH7712",     [CPU_SH7720]    = "SH7720",
 289         [CPU_SH7729]    = "SH7729",     [CPU_SH7750]    = "SH7750",
 290         [CPU_SH7750S]   = "SH7750S",    [CPU_SH7750R]   = "SH7750R",
 291         [CPU_SH7751]    = "SH7751",     [CPU_SH7751R]   = "SH7751R",
 292         [CPU_SH7760]    = "SH7760",
 293         [CPU_ST40RA]    = "ST40RA",     [CPU_ST40GX1]   = "ST40GX1",
 294         [CPU_SH4_202]   = "SH4-202",    [CPU_SH4_501]   = "SH4-501",
 295         [CPU_SH7770]    = "SH7770",     [CPU_SH7780]    = "SH7780",
 296         [CPU_SH7781]    = "SH7781",     [CPU_SH7343]    = "SH7343",
 297         [CPU_SH7785]    = "SH7785",     [CPU_SH7722]    = "SH7722",
 298         [CPU_SHX3]      = "SH-X3",      [CPU_SH_NONE]   = "Unknown"
 299 };
 300
 301 const char *get_cpu_subtype(struct sh_cpuinfo *c)
 302 {
 303         return cpu_name[c->type];
 304 }
 305
 306 #ifdef CONFIG_PROC_FS
 307 /* Symbolic CPU flags, keep in sync with asm/cpu-features.h */
 308 static const char *cpu_flags[] = {
 309         "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr",
 310         "ptea", "llsc", "l2", "op32", NULL
 311 };
 312
 313 static void show_cpuflags(struct seq_file *m, struct sh_cpuinfo *c)
 314 {
 315         unsigned long i;
 316
 317         seq_printf(m, "cpu flags\t:");
 318
 319         if (!c->flags) {
 320                 seq_printf(m, " %s\n", cpu_flags[0]);
 321                 return;
 322         }
 323
 324         for (i = 0; cpu_flags[i]; i++)
 325                 if ((c->flags & (1 << i)))
 326                         seq_printf(m, " %s", cpu_flags[i+1]);
 327
 328         seq_printf(m, "\n");
 329 }
 330
 331 static void show_cacheinfo(struct seq_file *m, const char *type,
 332                            struct cache_info info)
 333 {
 334         unsigned int cache_size;
 335
 336         cache_size = info.ways * info.sets * info.linesz;
 337
 338         seq_printf(m, "%s size\t: %2dKiB (%d-way)\n",
 339                    type, cache_size >> 10, info.ways);
 340 }
 341
 342 /*
 343  *      Get CPU information for use by the procfs.
 344  */
 345 static int show_cpuinfo(struct seq_file *m, void *v)
 346 {
 347         struct sh_cpuinfo *c = v;
 348         unsigned int cpu = c - cpu_data;
 349
 350         if (!cpu_online(cpu))
 351                 return 0;
 352
 353         if (cpu == 0)
 354                 seq_printf(m, "machine\t\t: %s\n", get_system_type());
 355
 356         seq_printf(m, "processor\t: %d\n", cpu);
 357         seq_printf(m, "cpu family\t: %s\n", init_utsname()->machine);
 358         seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype(c));
 359
 360         show_cpuflags(m, c);
 361
 362         seq_printf(m, "cache type\t: ");
 363
 364         /*
 365          * Check for what type of cache we have, we support both the
 366          * unified cache on the SH-2 and SH-3, as well as the harvard
 367          * style cache on the SH-4.
 368          */
 369         if (c->icache.flags & SH_CACHE_COMBINED) {
 370                 seq_printf(m, "unified\n");
 371                 show_cacheinfo(m, "cache", c->icache);
 372         } else {
 373                 seq_printf(m, "split (harvard)\n");
 374                 show_cacheinfo(m, "icache", c->icache);
 375                 show_cacheinfo(m, "dcache", c->dcache);
 376         }
 377
 378         /* Optional secondary cache */
 379         if (c->flags & CPU_HAS_L2_CACHE)
 380                 show_cacheinfo(m, "scache", c->scache);
 381
 382         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 383                      c->loops_per_jiffy/(500000/HZ),
 384                      (c->loops_per_jiffy/(5000/HZ)) % 100);
 385
 386         return 0;
 387 }
 388
 389 static void *c_start(struct seq_file *m, loff_t *pos)
 390 {
 391         return *pos < NR_CPUS ? cpu_data + *pos : NULL;
 392 }
 393 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 394 {
 395         ++*pos;
 396         return c_start(m, pos);
 397 }
 398 static void c_stop(struct seq_file *m, void *v)
 399 {
 400 }
 401 struct seq_operations cpuinfo_op = {
 402         .start  = c_start,
 403         .next   = c_next,
 404         .stop   = c_stop,
 405         .show   = show_cpuinfo,
 406 };
 407 #endif /* CONFIG_PROC_FS */