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 boot_cpu_data = { CPU_SH_NONE, 10000000, };
  46
  47 /*
  48  * The machine vector. First entry in .machvec.init, or clobbered by
  49  * sh_mv= on the command line, prior to .machvec.init teardown.
  50  */
  51 struct sh_machine_vector sh_mv = { .mv_name = "generic", };
  52
  53 #ifdef CONFIG_VT
  54 struct screen_info screen_info;
  55 #endif
  56
  57 extern int root_mountflags;
  58
  59 /*
  60  * This is set up by the setup-routine at boot-time
  61  */
  62 #define PARAM   ((unsigned char *)empty_zero_page)
  63
  64 #define MOUNT_ROOT_RDONLY (*(unsigned long *) (PARAM+0x000))
  65 #define RAMDISK_FLAGS (*(unsigned long *) (PARAM+0x004))
  66 #define ORIG_ROOT_DEV (*(unsigned long *) (PARAM+0x008))
  67 #define LOADER_TYPE (*(unsigned long *) (PARAM+0x00c))
  68 #define INITRD_START (*(unsigned long *) (PARAM+0x010))
  69 #define INITRD_SIZE (*(unsigned long *) (PARAM+0x014))
  70 /* ... */
  71 #define COMMAND_LINE ((char *) (PARAM+0x100))
  72
  73 #define RAMDISK_IMAGE_START_MASK        0x07FF
  74 #define RAMDISK_PROMPT_FLAG             0x8000
  75 #define RAMDISK_LOAD_FLAG               0x4000
  76
  77 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, };
  78
  79 static struct resource code_resource = { .name = "Kernel code", };
  80 static struct resource data_resource = { .name = "Kernel data", };
  81
  82 unsigned long memory_start;
  83 EXPORT_SYMBOL(memory_start);
  84
  85 unsigned long memory_end;
  86 EXPORT_SYMBOL(memory_end);
  87
  88 static int __init early_parse_mem(char *p)
  89 {
  90         unsigned long size;
  91
  92         memory_start = (unsigned long)PAGE_OFFSET+__MEMORY_START;
  93         size = memparse(p, &p);
  94         memory_end = memory_start + size;
  95
  96         return 0;
  97 }
  98 early_param("mem", early_parse_mem);
  99
 100 /*
 101  * Register fully available low RAM pages with the bootmem allocator.
 102  */
 103 static void __init register_bootmem_low_pages(void)
 104 {
 105         unsigned long curr_pfn, last_pfn, pages;
 106
 107         /*
 108          * We are rounding up the start address of usable memory:
 109          */
 110         curr_pfn = PFN_UP(__MEMORY_START);
 111
 112         /*
 113          * ... and at the end of the usable range downwards:
 114          */
 115         last_pfn = PFN_DOWN(__pa(memory_end));
 116
 117         if (last_pfn > max_low_pfn)
 118                 last_pfn = max_low_pfn;
 119
 120         pages = last_pfn - curr_pfn;
 121         free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(pages));
 122 }
 123
 124 void __init setup_bootmem_allocator(unsigned long free_pfn)
 125 {
 126         unsigned long bootmap_size;
 127
 128         /*
 129          * Find a proper area for the bootmem bitmap. After this
 130          * bootstrap step all allocations (until the page allocator
 131          * is intact) must be done via bootmem_alloc().
 132          */
 133         bootmap_size = init_bootmem_node(NODE_DATA(0), free_pfn,
 134                                          min_low_pfn, max_low_pfn);
 135
 136         add_active_range(0, min_low_pfn, max_low_pfn);
 137         register_bootmem_low_pages();
 138
 139         node_set_online(0);
 140
 141         /*
 142          * Reserve the kernel text and
 143          * Reserve the bootmem bitmap. We do this in two steps (first step
 144          * was init_bootmem()), because this catches the (definitely buggy)
 145          * case of us accidentally initializing the bootmem allocator with
 146          * an invalid RAM area.
 147          */
 148         reserve_bootmem(__MEMORY_START+PAGE_SIZE,
 149                 (PFN_PHYS(free_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START);
 150
 151         /*
 152          * reserve physical page 0 - it's a special BIOS page on many boxes,
 153          * enabling clean reboots, SMP operation, laptop functions.
 154          */
 155         reserve_bootmem(__MEMORY_START, PAGE_SIZE);
 156
 157         sparse_memory_present_with_active_regions(0);
 158
 159 #ifdef CONFIG_BLK_DEV_INITRD
 160         ROOT_DEV = MKDEV(RAMDISK_MAJOR, 0);
 161         if (&__rd_start != &__rd_end) {
 162                 LOADER_TYPE = 1;
 163                 INITRD_START = PHYSADDR((unsigned long)&__rd_start) -
 164                                         __MEMORY_START;
 165                 INITRD_SIZE = (unsigned long)&__rd_end -
 166                               (unsigned long)&__rd_start;
 167         }
 168
 169         if (LOADER_TYPE && INITRD_START) {
 170                 if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
 171                         reserve_bootmem(INITRD_START + __MEMORY_START,
 172                                         INITRD_SIZE);
 173                         initrd_start = INITRD_START + PAGE_OFFSET +
 174                                         __MEMORY_START;
 175                         initrd_end = initrd_start + INITRD_SIZE;
 176                 } else {
 177                         printk("initrd extends beyond end of memory "
 178                             "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 179                                     INITRD_START + INITRD_SIZE,
 180                                     max_low_pfn << PAGE_SHIFT);
 181                         initrd_start = 0;
 182                 }
 183         }
 184 #endif
 185 #ifdef CONFIG_KEXEC
 186         if (crashk_res.start != crashk_res.end)
 187                 reserve_bootmem(crashk_res.start,
 188                         crashk_res.end - crashk_res.start + 1);
 189 #endif
 190 }
 191
 192 #ifndef CONFIG_NEED_MULTIPLE_NODES
 193 static void __init setup_memory(void)
 194 {
 195         unsigned long start_pfn;
 196
 197         /*
 198          * Partially used pages are not usable - thus
 199          * we are rounding upwards:
 200          */
 201         start_pfn = PFN_UP(__pa(_end));
 202         setup_bootmem_allocator(start_pfn);
 203 }
 204 #else
 205 extern void __init setup_memory(void);
 206 #endif
 207
 208 void __init setup_arch(char **cmdline_p)
 209 {
 210         enable_mmu();
 211
 212         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
 213
 214 #ifdef CONFIG_BLK_DEV_RAM
 215         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
 216         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
 217         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
 218 #endif
 219
 220         if (!MOUNT_ROOT_RDONLY)
 221                 root_mountflags &= ~MS_RDONLY;
 222         init_mm.start_code = (unsigned long) _text;
 223         init_mm.end_code = (unsigned long) _etext;
 224         init_mm.end_data = (unsigned long) _edata;
 225         init_mm.brk = (unsigned long) _end;
 226
 227         code_resource.start = virt_to_phys(_text);
 228         code_resource.end = virt_to_phys(_etext)-1;
 229         data_resource.start = virt_to_phys(_etext);
 230         data_resource.end = virt_to_phys(_edata)-1;
 231
 232         memory_start = (unsigned long)PAGE_OFFSET+__MEMORY_START;
 233         memory_end = memory_start + __MEMORY_SIZE;
 234
 235 #ifdef CONFIG_CMDLINE_BOOL
 236         strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
 237 #else
 238         strlcpy(command_line, COMMAND_LINE, sizeof(command_line));
 239 #endif
 240
 241         /* Save unparsed command line copy for /proc/cmdline */
 242         memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 243         *cmdline_p = command_line;
 244
 245         parse_early_param();
 246
 247         sh_mv_setup();
 248
 249         /*
 250          * Find the highest page frame number we have available
 251          */
 252         max_pfn = PFN_DOWN(__pa(memory_end));
 253
 254         /*
 255          * Determine low and high memory ranges:
 256          */
 257         max_low_pfn = max_pfn;
 258         min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
 259
 260         nodes_clear(node_online_map);
 261
 262         /* Setup bootmem with available RAM */
 263         setup_memory();
 264         sparse_init();
 265
 266 #ifdef CONFIG_DUMMY_CONSOLE
 267         conswitchp = &dummy_con;
 268 #endif
 269
 270         /* Perform the machine specific initialisation */
 271         if (likely(sh_mv.mv_setup))
 272                 sh_mv.mv_setup(cmdline_p);
 273
 274         paging_init();
 275 }
 276
 277 static const char *cpu_name[] = {
 278         [CPU_SH7206]    = "SH7206",     [CPU_SH7619]    = "SH7619",
 279         [CPU_SH7300]    = "SH7300",
 280         [CPU_SH7705]    = "SH7705",     [CPU_SH7706]    = "SH7706",
 281         [CPU_SH7707]    = "SH7707",     [CPU_SH7708]    = "SH7708",
 282         [CPU_SH7709]    = "SH7709",     [CPU_SH7710]    = "SH7710",
 283         [CPU_SH7712]    = "SH7712",
 284         [CPU_SH7729]    = "SH7729",     [CPU_SH7750]    = "SH7750",
 285         [CPU_SH7750S]   = "SH7750S",    [CPU_SH7750R]   = "SH7750R",
 286         [CPU_SH7751]    = "SH7751",     [CPU_SH7751R]   = "SH7751R",
 287         [CPU_SH7760]    = "SH7760",
 288         [CPU_ST40RA]    = "ST40RA",     [CPU_ST40GX1]   = "ST40GX1",
 289         [CPU_SH4_202]   = "SH4-202",    [CPU_SH4_501]   = "SH4-501",
 290         [CPU_SH7770]    = "SH7770",     [CPU_SH7780]    = "SH7780",
 291         [CPU_SH7781]    = "SH7781",     [CPU_SH7343]    = "SH7343",
 292         [CPU_SH7785]    = "SH7785",     [CPU_SH7722]    = "SH7722",
 293         [CPU_SHX3]      = "SH-X3",      [CPU_SH_NONE]   = "Unknown"
 294 };
 295
 296 const char *get_cpu_subtype(struct sh_cpuinfo *c)
 297 {
 298         return cpu_name[c->type];
 299 }
 300
 301 #ifdef CONFIG_PROC_FS
 302 /* Symbolic CPU flags, keep in sync with asm/cpu-features.h */
 303 static const char *cpu_flags[] = {
 304         "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr",
 305         "ptea", "llsc", "l2", "op32", NULL
 306 };
 307
 308 static void show_cpuflags(struct seq_file *m, struct sh_cpuinfo *c)
 309 {
 310         unsigned long i;
 311
 312         seq_printf(m, "cpu flags\t:");
 313
 314         if (!c->flags) {
 315                 seq_printf(m, " %s\n", cpu_flags[0]);
 316                 return;
 317         }
 318
 319         for (i = 0; cpu_flags[i]; i++)
 320                 if ((c->flags & (1 << i)))
 321                         seq_printf(m, " %s", cpu_flags[i+1]);
 322
 323         seq_printf(m, "\n");
 324 }
 325
 326 static void show_cacheinfo(struct seq_file *m, const char *type,
 327                            struct cache_info info)
 328 {
 329         unsigned int cache_size;
 330
 331         cache_size = info.ways * info.sets * info.linesz;
 332
 333         seq_printf(m, "%s size\t: %2dKiB (%d-way)\n",
 334                    type, cache_size >> 10, info.ways);
 335 }
 336
 337 /*
 338  *      Get CPU information for use by the procfs.
 339  */
 340 static int show_cpuinfo(struct seq_file *m, void *v)
 341 {
 342         struct sh_cpuinfo *c = v;
 343         unsigned int cpu = c - cpu_data;
 344
 345         if (!cpu_online(cpu))
 346                 return 0;
 347
 348         if (cpu == 0)
 349                 seq_printf(m, "machine\t\t: %s\n", get_system_type());
 350
 351         seq_printf(m, "processor\t: %d\n", cpu);
 352         seq_printf(m, "cpu family\t: %s\n", init_utsname()->machine);
 353         seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype(c));
 354
 355         show_cpuflags(m, c);
 356
 357         seq_printf(m, "cache type\t: ");
 358
 359         /*
 360          * Check for what type of cache we have, we support both the
 361          * unified cache on the SH-2 and SH-3, as well as the harvard
 362          * style cache on the SH-4.
 363          */
 364         if (c->icache.flags & SH_CACHE_COMBINED) {
 365                 seq_printf(m, "unified\n");
 366                 show_cacheinfo(m, "cache", c->icache);
 367         } else {
 368                 seq_printf(m, "split (harvard)\n");
 369                 show_cacheinfo(m, "icache", c->icache);
 370                 show_cacheinfo(m, "dcache", c->dcache);
 371         }
 372
 373         /* Optional secondary cache */
 374         if (c->flags & CPU_HAS_L2_CACHE)
 375                 show_cacheinfo(m, "scache", c->scache);
 376
 377         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 378                      c->loops_per_jiffy/(500000/HZ),
 379                      (c->loops_per_jiffy/(5000/HZ)) % 100);
 380
 381         return 0;
 382 }
 383
 384 static void *c_start(struct seq_file *m, loff_t *pos)
 385 {
 386         return *pos < NR_CPUS ? cpu_data + *pos : NULL;
 387 }
 388 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 389 {
 390         ++*pos;
 391         return c_start(m, pos);
 392 }
 393 static void c_stop(struct seq_file *m, void *v)
 394 {
 395 }
 396 struct seq_operations cpuinfo_op = {
 397         .start  = c_start,
 398         .next   = c_next,
 399         .stop   = c_stop,
 400         .show   = show_cpuinfo,
 401 };
 402 #endif /* CONFIG_PROC_FS */