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 <asm/uaccess.h>
  27 #include <asm/io.h>
  28 #include <asm/page.h>
  29 #include <asm/elf.h>
  30 #include <asm/sections.h>
  31 #include <asm/irq.h>
  32 #include <asm/setup.h>
  33 #include <asm/clock.h>
  34 #include <asm/mmu_context.h>
  35
  36 /*
  37  * Initialize loops_per_jiffy as 10000000 (1000MIPS).
  38  * This value will be used at the very early stage of serial setup.
  39  * The bigger value means no problem.
  40  */
  41 struct sh_cpuinfo cpu_data[NR_CPUS] __read_mostly = {
  42         [0] = {
  43                 .type                   = CPU_SH_NONE,
  44                 .loops_per_jiffy        = 10000000,
  45         },
  46 };
  47 EXPORT_SYMBOL(cpu_data);
  48
  49 /*
  50  * The machine vector. First entry in .machvec.init, or clobbered by
  51  * sh_mv= on the command line, prior to .machvec.init teardown.
  52  */
  53 struct sh_machine_vector sh_mv = { .mv_name = "generic", };
  54
  55 #ifdef CONFIG_VT
  56 struct screen_info screen_info;
  57 #endif
  58
  59 extern int root_mountflags;
  60
  61 #define RAMDISK_IMAGE_START_MASK        0x07FF
  62 #define RAMDISK_PROMPT_FLAG             0x8000
  63 #define RAMDISK_LOAD_FLAG               0x4000
  64
  65 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, };
  66
  67 static struct resource code_resource = {
  68         .name = "Kernel code",
  69         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  70 };
  71
  72 static struct resource data_resource = {
  73         .name = "Kernel data",
  74         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  75 };
  76
  77 unsigned long memory_start;
  78 EXPORT_SYMBOL(memory_start);
  79 unsigned long memory_end = 0;
  80 EXPORT_SYMBOL(memory_end);
  81
  82 int l1i_cache_shape, l1d_cache_shape, l2_cache_shape;
  83
  84 static int __init early_parse_mem(char *p)
  85 {
  86         unsigned long size;
  87
  88         memory_start = (unsigned long)__va(__MEMORY_START);
  89         size = memparse(p, &p);
  90
  91         if (size > __MEMORY_SIZE) {
  92                 static char msg[] __initdata = KERN_ERR
  93                         "Using mem= to increase the size of kernel memory "
  94                         "is not allowed.\n"
  95                         "  Recompile the kernel with the correct value for "
  96                         "CONFIG_MEMORY_SIZE.\n";
  97                 printk(msg);
  98                 return 0;
  99         }
 100
 101         memory_end = memory_start + size;
 102
 103         return 0;
 104 }
 105 early_param("mem", early_parse_mem);
 106
 107 /*
 108  * Register fully available low RAM pages with the bootmem allocator.
 109  */
 110 static void __init register_bootmem_low_pages(void)
 111 {
 112         unsigned long curr_pfn, last_pfn, pages;
 113
 114         /*
 115          * We are rounding up the start address of usable memory:
 116          */
 117         curr_pfn = PFN_UP(__MEMORY_START);
 118
 119         /*
 120          * ... and at the end of the usable range downwards:
 121          */
 122         last_pfn = PFN_DOWN(__pa(memory_end));
 123
 124         if (last_pfn > max_low_pfn)
 125                 last_pfn = max_low_pfn;
 126
 127         pages = last_pfn - curr_pfn;
 128         free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(pages));
 129 }
 130
 131 #ifdef CONFIG_KEXEC
 132 static void __init reserve_crashkernel(void)
 133 {
 134         unsigned long long free_mem;
 135         unsigned long long crash_size, crash_base;
 136         int ret;
 137
 138         free_mem = ((unsigned long long)max_low_pfn - min_low_pfn) << PAGE_SHIFT;
 139
 140         ret = parse_crashkernel(boot_command_line, free_mem,
 141                         &crash_size, &crash_base);
 142         if (ret == 0 && crash_size) {
 143                 if (crash_base > 0) {
 144                         printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
 145                                         "for crashkernel (System RAM: %ldMB)\n",
 146                                         (unsigned long)(crash_size >> 20),
 147                                         (unsigned long)(crash_base >> 20),
 148                                         (unsigned long)(free_mem >> 20));
 149                         crashk_res.start = crash_base;
 150                         crashk_res.end   = crash_base + crash_size - 1;
 151                         reserve_bootmem(crash_base, crash_size,
 152                                         BOOTMEM_DEFAULT);
 153                 } else
 154                         printk(KERN_INFO "crashkernel reservation failed - "
 155                                         "you have to specify a base address\n");
 156         }
 157 }
 158 #else
 159 static inline void __init reserve_crashkernel(void)
 160 {}
 161 #endif
 162
 163 void __init setup_bootmem_allocator(unsigned long free_pfn)
 164 {
 165         unsigned long bootmap_size;
 166
 167         /*
 168          * Find a proper area for the bootmem bitmap. After this
 169          * bootstrap step all allocations (until the page allocator
 170          * is intact) must be done via bootmem_alloc().
 171          */
 172         bootmap_size = init_bootmem_node(NODE_DATA(0), free_pfn,
 173                                          min_low_pfn, max_low_pfn);
 174
 175         add_active_range(0, min_low_pfn, max_low_pfn);
 176         register_bootmem_low_pages();
 177
 178         node_set_online(0);
 179
 180         /*
 181          * Reserve the kernel text and
 182          * Reserve the bootmem bitmap. We do this in two steps (first step
 183          * was init_bootmem()), because this catches the (definitely buggy)
 184          * case of us accidentally initializing the bootmem allocator with
 185          * an invalid RAM area.
 186          */
 187         reserve_bootmem(__MEMORY_START+PAGE_SIZE,
 188                 (PFN_PHYS(free_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START,
 189                 BOOTMEM_DEFAULT);
 190
 191         /*
 192          * reserve physical page 0 - it's a special BIOS page on many boxes,
 193          * enabling clean reboots, SMP operation, laptop functions.
 194          */
 195         reserve_bootmem(__MEMORY_START, PAGE_SIZE, BOOTMEM_DEFAULT);
 196
 197         sparse_memory_present_with_active_regions(0);
 198
 199 #ifdef CONFIG_BLK_DEV_INITRD
 200         ROOT_DEV = Root_RAM0;
 201
 202         if (LOADER_TYPE && INITRD_START) {
 203                 if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
 204                         reserve_bootmem(INITRD_START + __MEMORY_START,
 205                                         INITRD_SIZE, BOOTMEM_DEFAULT);
 206                         initrd_start = INITRD_START + PAGE_OFFSET +
 207                                         __MEMORY_START;
 208                         initrd_end = initrd_start + INITRD_SIZE;
 209                 } else {
 210                         printk("initrd extends beyond end of memory "
 211                             "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 212                                     INITRD_START + INITRD_SIZE,
 213                                     max_low_pfn << PAGE_SHIFT);
 214                         initrd_start = 0;
 215                 }
 216         }
 217 #endif
 218
 219         reserve_crashkernel();
 220 }
 221
 222 #ifndef CONFIG_NEED_MULTIPLE_NODES
 223 static void __init setup_memory(void)
 224 {
 225         unsigned long start_pfn;
 226
 227         /*
 228          * Partially used pages are not usable - thus
 229          * we are rounding upwards:
 230          */
 231         start_pfn = PFN_UP(__pa(_end));
 232         setup_bootmem_allocator(start_pfn);
 233 }
 234 #else
 235 extern void __init setup_memory(void);
 236 #endif
 237
 238 void __init setup_arch(char **cmdline_p)
 239 {
 240         enable_mmu();
 241
 242         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
 243
 244 #ifdef CONFIG_BLK_DEV_RAM
 245         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
 246         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
 247         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
 248 #endif
 249
 250         if (!MOUNT_ROOT_RDONLY)
 251                 root_mountflags &= ~MS_RDONLY;
 252         init_mm.start_code = (unsigned long) _text;
 253         init_mm.end_code = (unsigned long) _etext;
 254         init_mm.end_data = (unsigned long) _edata;
 255         init_mm.brk = (unsigned long) _end;
 256
 257         code_resource.start = virt_to_phys(_text);
 258         code_resource.end = virt_to_phys(_etext)-1;
 259         data_resource.start = virt_to_phys(_etext);
 260         data_resource.end = virt_to_phys(_edata)-1;
 261
 262         memory_start = (unsigned long)__va(__MEMORY_START);
 263         if (!memory_end)
 264                 memory_end = memory_start + __MEMORY_SIZE;
 265
 266 #ifdef CONFIG_CMDLINE_BOOL
 267         strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
 268 #else
 269         strlcpy(command_line, COMMAND_LINE, sizeof(command_line));
 270 #endif
 271
 272         /* Save unparsed command line copy for /proc/cmdline */
 273         memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 274         *cmdline_p = command_line;
 275
 276         parse_early_param();
 277
 278         sh_mv_setup();
 279
 280         /*
 281          * Find the highest page frame number we have available
 282          */
 283         max_pfn = PFN_DOWN(__pa(memory_end));
 284
 285         /*
 286          * Determine low and high memory ranges:
 287          */
 288         max_low_pfn = max_pfn;
 289         min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
 290
 291         nodes_clear(node_online_map);
 292
 293         /* Setup bootmem with available RAM */
 294         setup_memory();
 295         sparse_init();
 296
 297 #ifdef CONFIG_DUMMY_CONSOLE
 298         conswitchp = &dummy_con;
 299 #endif
 300
 301         /* Perform the machine specific initialisation */
 302         if (likely(sh_mv.mv_setup))
 303                 sh_mv.mv_setup(cmdline_p);
 304
 305         paging_init();
 306
 307 #ifdef CONFIG_SMP
 308         plat_smp_setup();
 309 #endif
 310 }
 311
 312 static const char *cpu_name[] = {
 313         [CPU_SH7203]    = "SH7203",     [CPU_SH7263]    = "SH7263",
 314         [CPU_SH7206]    = "SH7206",     [CPU_SH7619]    = "SH7619",
 315         [CPU_SH7705]    = "SH7705",     [CPU_SH7706]    = "SH7706",
 316         [CPU_SH7707]    = "SH7707",     [CPU_SH7708]    = "SH7708",
 317         [CPU_SH7709]    = "SH7709",     [CPU_SH7710]    = "SH7710",
 318         [CPU_SH7712]    = "SH7712",     [CPU_SH7720]    = "SH7720",
 319         [CPU_SH7721]    = "SH7721",     [CPU_SH7729]    = "SH7729",
 320         [CPU_SH7750]    = "SH7750",     [CPU_SH7750S]   = "SH7750S",
 321         [CPU_SH7750R]   = "SH7750R",    [CPU_SH7751]    = "SH7751",
 322         [CPU_SH7751R]   = "SH7751R",    [CPU_SH7760]    = "SH7760",
 323         [CPU_SH4_202]   = "SH4-202",    [CPU_SH4_501]   = "SH4-501",
 324         [CPU_SH7763]    = "SH7763",     [CPU_SH7770]    = "SH7770",
 325         [CPU_SH7780]    = "SH7780",     [CPU_SH7781]    = "SH7781",
 326         [CPU_SH7343]    = "SH7343",     [CPU_SH7785]    = "SH7785",
 327         [CPU_SH7722]    = "SH7722",     [CPU_SHX3]      = "SH-X3",
 328         [CPU_SH5_101]   = "SH5-101",    [CPU_SH5_103]   = "SH5-103",
 329         [CPU_SH_NONE]   = "Unknown"
 330 };
 331
 332 const char *get_cpu_subtype(struct sh_cpuinfo *c)
 333 {
 334         return cpu_name[c->type];
 335 }
 336
 337 #ifdef CONFIG_PROC_FS
 338 /* Symbolic CPU flags, keep in sync with asm/cpu-features.h */
 339 static const char *cpu_flags[] = {
 340         "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr",
 341         "ptea", "llsc", "l2", "op32", NULL
 342 };
 343
 344 static void show_cpuflags(struct seq_file *m, struct sh_cpuinfo *c)
 345 {
 346         unsigned long i;
 347
 348         seq_printf(m, "cpu flags\t:");
 349
 350         if (!c->flags) {
 351                 seq_printf(m, " %s\n", cpu_flags[0]);
 352                 return;
 353         }
 354
 355         for (i = 0; cpu_flags[i]; i++)
 356                 if ((c->flags & (1 << i)))
 357                         seq_printf(m, " %s", cpu_flags[i+1]);
 358
 359         seq_printf(m, "\n");
 360 }
 361
 362 static void show_cacheinfo(struct seq_file *m, const char *type,
 363                            struct cache_info info)
 364 {
 365         unsigned int cache_size;
 366
 367         cache_size = info.ways * info.sets * info.linesz;
 368
 369         seq_printf(m, "%s size\t: %2dKiB (%d-way)\n",
 370                    type, cache_size >> 10, info.ways);
 371 }
 372
 373 /*
 374  *      Get CPU information for use by the procfs.
 375  */
 376 static int show_cpuinfo(struct seq_file *m, void *v)
 377 {
 378         struct sh_cpuinfo *c = v;
 379         unsigned int cpu = c - cpu_data;
 380
 381         if (!cpu_online(cpu))
 382                 return 0;
 383
 384         if (cpu == 0)
 385                 seq_printf(m, "machine\t\t: %s\n", get_system_type());
 386
 387         seq_printf(m, "processor\t: %d\n", cpu);
 388         seq_printf(m, "cpu family\t: %s\n", init_utsname()->machine);
 389         seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype(c));
 390
 391         show_cpuflags(m, c);
 392
 393         seq_printf(m, "cache type\t: ");
 394
 395         /*
 396          * Check for what type of cache we have, we support both the
 397          * unified cache on the SH-2 and SH-3, as well as the harvard
 398          * style cache on the SH-4.
 399          */
 400         if (c->icache.flags & SH_CACHE_COMBINED) {
 401                 seq_printf(m, "unified\n");
 402                 show_cacheinfo(m, "cache", c->icache);
 403         } else {
 404                 seq_printf(m, "split (harvard)\n");
 405                 show_cacheinfo(m, "icache", c->icache);
 406                 show_cacheinfo(m, "dcache", c->dcache);
 407         }
 408
 409         /* Optional secondary cache */
 410         if (c->flags & CPU_HAS_L2_CACHE)
 411                 show_cacheinfo(m, "scache", c->scache);
 412
 413         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 414                      c->loops_per_jiffy/(500000/HZ),
 415                      (c->loops_per_jiffy/(5000/HZ)) % 100);
 416
 417         return 0;
 418 }
 419
 420 static void *c_start(struct seq_file *m, loff_t *pos)
 421 {
 422         return *pos < NR_CPUS ? cpu_data + *pos : NULL;
 423 }
 424 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 425 {
 426         ++*pos;
 427         return c_start(m, pos);
 428 }
 429 static void c_stop(struct seq_file *m, void *v)
 430 {
 431 }
 432 const struct seq_operations cpuinfo_op = {
 433         .start  = c_start,
 434         .next   = c_next,
 435         .stop   = c_stop,
 436         .show   = show_cpuinfo,
 437 };
 438 #endif /* CONFIG_PROC_FS */