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 <asm/uaccess.h>
  30 #include <asm/io.h>
  31 #include <asm/page.h>
  32 #include <asm/elf.h>
  33 #include <asm/sections.h>
  34 #include <asm/irq.h>
  35 #include <asm/setup.h>
  36 #include <asm/clock.h>
  37 #include <asm/mmu_context.h>
  38
  39 /*
  40  * Initialize loops_per_jiffy as 10000000 (1000MIPS).
  41  * This value will be used at the very early stage of serial setup.
  42  * The bigger value means no problem.
  43  */
  44 struct sh_cpuinfo cpu_data[NR_CPUS] __read_mostly = {
  45         [0] = {
  46                 .type                   = CPU_SH_NONE,
  47                 .loops_per_jiffy        = 10000000,
  48         },
  49 };
  50 EXPORT_SYMBOL(cpu_data);
  51
  52 /*
  53  * The machine vector. First entry in .machvec.init, or clobbered by
  54  * sh_mv= on the command line, prior to .machvec.init teardown.
  55  */
  56 struct sh_machine_vector sh_mv = { .mv_name = "generic", };
  57 EXPORT_SYMBOL(sh_mv);
  58
  59 #ifdef CONFIG_VT
  60 struct screen_info screen_info;
  61 #endif
  62
  63 extern int root_mountflags;
  64
  65 #define RAMDISK_IMAGE_START_MASK        0x07FF
  66 #define RAMDISK_PROMPT_FLAG             0x8000
  67 #define RAMDISK_LOAD_FLAG               0x4000
  68
  69 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, };
  70
  71 static struct resource code_resource = {
  72         .name = "Kernel code",
  73         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  74 };
  75
  76 static struct resource data_resource = {
  77         .name = "Kernel data",
  78         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  79 };
  80
  81 static struct resource bss_resource = {
  82         .name   = "Kernel bss",
  83         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM,
  84 };
  85
  86 unsigned long memory_start;
  87 EXPORT_SYMBOL(memory_start);
  88 unsigned long memory_end = 0;
  89 EXPORT_SYMBOL(memory_end);
  90
  91 static struct resource mem_resources[MAX_NUMNODES];
  92
  93 int l1i_cache_shape, l1d_cache_shape, l2_cache_shape;
  94
  95 static int __init early_parse_mem(char *p)
  96 {
  97         unsigned long size;
  98
  99         memory_start = (unsigned long)__va(__MEMORY_START);
 100         size = memparse(p, &p);
 101
 102         if (size > __MEMORY_SIZE) {
 103                 static char msg[] __initdata = KERN_ERR
 104                         "Using mem= to increase the size of kernel memory "
 105                         "is not allowed.\n"
 106                         "  Recompile the kernel with the correct value for "
 107                         "CONFIG_MEMORY_SIZE.\n";
 108                 printk(msg);
 109                 return 0;
 110         }
 111
 112         memory_end = memory_start + size;
 113
 114         return 0;
 115 }
 116 early_param("mem", early_parse_mem);
 117
 118 /*
 119  * Register fully available low RAM pages with the bootmem allocator.
 120  */
 121 static void __init register_bootmem_low_pages(void)
 122 {
 123         unsigned long curr_pfn, last_pfn, pages;
 124
 125         /*
 126          * We are rounding up the start address of usable memory:
 127          */
 128         curr_pfn = PFN_UP(__MEMORY_START);
 129
 130         /*
 131          * ... and at the end of the usable range downwards:
 132          */
 133         last_pfn = PFN_DOWN(__pa(memory_end));
 134
 135         if (last_pfn > max_low_pfn)
 136                 last_pfn = max_low_pfn;
 137
 138         pages = last_pfn - curr_pfn;
 139         free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(pages));
 140 }
 141
 142 #ifdef CONFIG_KEXEC
 143 static void __init reserve_crashkernel(void)
 144 {
 145         unsigned long long free_mem;
 146         unsigned long long crash_size, crash_base;
 147         int ret;
 148
 149         free_mem = ((unsigned long long)max_low_pfn - min_low_pfn) << PAGE_SHIFT;
 150
 151         ret = parse_crashkernel(boot_command_line, free_mem,
 152                         &crash_size, &crash_base);
 153         if (ret == 0 && crash_size) {
 154                 if (crash_base <= 0) {
 155                         printk(KERN_INFO "crashkernel reservation failed - "
 156                                         "you have to specify a base address\n");
 157                         return;
 158                 }
 159
 160                 if (reserve_bootmem(crash_base, crash_size,
 161                                         BOOTMEM_EXCLUSIVE) < 0) {
 162                         printk(KERN_INFO "crashkernel reservation failed - "
 163                                         "memory is in use\n");
 164                         return;
 165                 }
 166
 167                 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
 168                                 "for crashkernel (System RAM: %ldMB)\n",
 169                                 (unsigned long)(crash_size >> 20),
 170                                 (unsigned long)(crash_base >> 20),
 171                                 (unsigned long)(free_mem >> 20));
 172                 crashk_res.start = crash_base;
 173                 crashk_res.end   = crash_base + crash_size - 1;
 174                 insert_resource(&iomem_resource, &crashk_res);
 175         }
 176 }
 177 #else
 178 static inline void __init reserve_crashkernel(void)
 179 {}
 180 #endif
 181
 182 void __init __add_active_range(unsigned int nid, unsigned long start_pfn,
 183                                                 unsigned long end_pfn)
 184 {
 185         struct resource *res = &mem_resources[nid];
 186
 187         WARN_ON(res->name); /* max one active range per node for now */
 188
 189         res->name = "System RAM";
 190         res->start = start_pfn << PAGE_SHIFT;
 191         res->end = (end_pfn << PAGE_SHIFT) - 1;
 192         res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 193         if (request_resource(&iomem_resource, res)) {
 194                 pr_err("unable to request memory_resource 0x%lx 0x%lx\n",
 195                        start_pfn, end_pfn);
 196                 return;
 197         }
 198
 199         /*
 200          *  We don't know which RAM region contains kernel data,
 201          *  so we try it repeatedly and let the resource manager
 202          *  test it.
 203          */
 204         request_resource(res, &code_resource);
 205         request_resource(res, &data_resource);
 206         request_resource(res, &bss_resource);
 207
 208         add_active_range(nid, start_pfn, end_pfn);
 209 }
 210
 211 void __init setup_bootmem_allocator(unsigned long free_pfn)
 212 {
 213         unsigned long bootmap_size;
 214
 215         /*
 216          * Find a proper area for the bootmem bitmap. After this
 217          * bootstrap step all allocations (until the page allocator
 218          * is intact) must be done via bootmem_alloc().
 219          */
 220         bootmap_size = init_bootmem_node(NODE_DATA(0), free_pfn,
 221                                          min_low_pfn, max_low_pfn);
 222
 223         __add_active_range(0, min_low_pfn, max_low_pfn);
 224         register_bootmem_low_pages();
 225
 226         node_set_online(0);
 227
 228         /*
 229          * Reserve the kernel text and
 230          * Reserve the bootmem bitmap. We do this in two steps (first step
 231          * was init_bootmem()), because this catches the (definitely buggy)
 232          * case of us accidentally initializing the bootmem allocator with
 233          * an invalid RAM area.
 234          */
 235         reserve_bootmem(__MEMORY_START+PAGE_SIZE,
 236                 (PFN_PHYS(free_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START,
 237                 BOOTMEM_DEFAULT);
 238
 239         /*
 240          * reserve physical page 0 - it's a special BIOS page on many boxes,
 241          * enabling clean reboots, SMP operation, laptop functions.
 242          */
 243         reserve_bootmem(__MEMORY_START, PAGE_SIZE, BOOTMEM_DEFAULT);
 244
 245         sparse_memory_present_with_active_regions(0);
 246
 247 #ifdef CONFIG_BLK_DEV_INITRD
 248         ROOT_DEV = Root_RAM0;
 249
 250         if (LOADER_TYPE && INITRD_START) {
 251                 if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
 252                         reserve_bootmem(INITRD_START + __MEMORY_START,
 253                                         INITRD_SIZE, BOOTMEM_DEFAULT);
 254                         initrd_start = INITRD_START + PAGE_OFFSET +
 255                                         __MEMORY_START;
 256                         initrd_end = initrd_start + INITRD_SIZE;
 257                 } else {
 258                         printk("initrd extends beyond end of memory "
 259                             "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 260                                     INITRD_START + INITRD_SIZE,
 261                                     max_low_pfn << PAGE_SHIFT);
 262                         initrd_start = 0;
 263                 }
 264         }
 265 #endif
 266
 267         reserve_crashkernel();
 268 }
 269
 270 #ifndef CONFIG_NEED_MULTIPLE_NODES
 271 static void __init setup_memory(void)
 272 {
 273         unsigned long start_pfn;
 274
 275         /*
 276          * Partially used pages are not usable - thus
 277          * we are rounding upwards:
 278          */
 279         start_pfn = PFN_UP(__pa(_end));
 280         setup_bootmem_allocator(start_pfn);
 281 }
 282 #else
 283 extern void __init setup_memory(void);
 284 #endif
 285
 286 /*
 287  * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
 288  * is_kdump_kernel() to determine if we are booting after a panic. Hence
 289  * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
 290  */
 291 #ifdef CONFIG_CRASH_DUMP
 292 /* elfcorehdr= specifies the location of elf core header
 293  * stored by the crashed kernel.
 294  */
 295 static int __init parse_elfcorehdr(char *arg)
 296 {
 297         if (!arg)
 298                 return -EINVAL;
 299         elfcorehdr_addr = memparse(arg, &arg);
 300         return 0;
 301 }
 302 early_param("elfcorehdr", parse_elfcorehdr);
 303 #endif
 304
 305 void __init setup_arch(char **cmdline_p)
 306 {
 307         enable_mmu();
 308
 309         ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
 310
 311         printk(KERN_NOTICE "Boot params:\n"
 312                            "... MOUNT_ROOT_RDONLY - %08lx\n"
 313                            "... RAMDISK_FLAGS     - %08lx\n"
 314                            "... ORIG_ROOT_DEV     - %08lx\n"
 315                            "... LOADER_TYPE       - %08lx\n"
 316                            "... INITRD_START      - %08lx\n"
 317                            "... INITRD_SIZE       - %08lx\n",
 318                            MOUNT_ROOT_RDONLY, RAMDISK_FLAGS,
 319                            ORIG_ROOT_DEV, LOADER_TYPE,
 320                            INITRD_START, INITRD_SIZE);
 321
 322 #ifdef CONFIG_BLK_DEV_RAM
 323         rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
 324         rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
 325         rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
 326 #endif
 327
 328         if (!MOUNT_ROOT_RDONLY)
 329                 root_mountflags &= ~MS_RDONLY;
 330         init_mm.start_code = (unsigned long) _text;
 331         init_mm.end_code = (unsigned long) _etext;
 332         init_mm.end_data = (unsigned long) _edata;
 333         init_mm.brk = (unsigned long) _end;
 334
 335         code_resource.start = virt_to_phys(_text);
 336         code_resource.end = virt_to_phys(_etext)-1;
 337         data_resource.start = virt_to_phys(_etext);
 338         data_resource.end = virt_to_phys(_edata)-1;
 339         bss_resource.start = virt_to_phys(__bss_start);
 340         bss_resource.end = virt_to_phys(_ebss)-1;
 341
 342         memory_start = (unsigned long)__va(__MEMORY_START);
 343         if (!memory_end)
 344                 memory_end = memory_start + __MEMORY_SIZE;
 345
 346 #ifdef CONFIG_CMDLINE_BOOL
 347         strlcpy(command_line, CONFIG_CMDLINE, sizeof(command_line));
 348 #else
 349         strlcpy(command_line, COMMAND_LINE, sizeof(command_line));
 350 #endif
 351
 352         /* Save unparsed command line copy for /proc/cmdline */
 353         memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 354         *cmdline_p = command_line;
 355
 356         parse_early_param();
 357
 358         sh_mv_setup();
 359
 360         /*
 361          * Find the highest page frame number we have available
 362          */
 363         max_pfn = PFN_DOWN(__pa(memory_end));
 364
 365         /*
 366          * Determine low and high memory ranges:
 367          */
 368         max_low_pfn = max_pfn;
 369         min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
 370
 371         nodes_clear(node_online_map);
 372
 373         /* Setup bootmem with available RAM */
 374         setup_memory();
 375         sparse_init();
 376
 377 #ifdef CONFIG_DUMMY_CONSOLE
 378         conswitchp = &dummy_con;
 379 #endif
 380
 381         /* Perform the machine specific initialisation */
 382         if (likely(sh_mv.mv_setup))
 383                 sh_mv.mv_setup(cmdline_p);
 384
 385         paging_init();
 386
 387 #ifdef CONFIG_SMP
 388         plat_smp_setup();
 389 #endif
 390 }
 391
 392 static const char *cpu_name[] = {
 393         [CPU_SH7203]    = "SH7203",     [CPU_SH7263]    = "SH7263",
 394         [CPU_SH7206]    = "SH7206",     [CPU_SH7619]    = "SH7619",
 395         [CPU_SH7705]    = "SH7705",     [CPU_SH7706]    = "SH7706",
 396         [CPU_SH7707]    = "SH7707",     [CPU_SH7708]    = "SH7708",
 397         [CPU_SH7709]    = "SH7709",     [CPU_SH7710]    = "SH7710",
 398         [CPU_SH7712]    = "SH7712",     [CPU_SH7720]    = "SH7720",
 399         [CPU_SH7721]    = "SH7721",     [CPU_SH7729]    = "SH7729",
 400         [CPU_SH7750]    = "SH7750",     [CPU_SH7750S]   = "SH7750S",
 401         [CPU_SH7750R]   = "SH7750R",    [CPU_SH7751]    = "SH7751",
 402         [CPU_SH7751R]   = "SH7751R",    [CPU_SH7760]    = "SH7760",
 403         [CPU_SH4_202]   = "SH4-202",    [CPU_SH4_501]   = "SH4-501",
 404         [CPU_SH7763]    = "SH7763",     [CPU_SH7770]    = "SH7770",
 405         [CPU_SH7780]    = "SH7780",     [CPU_SH7781]    = "SH7781",
 406         [CPU_SH7343]    = "SH7343",     [CPU_SH7785]    = "SH7785",
 407         [CPU_SH7722]    = "SH7722",     [CPU_SHX3]      = "SH-X3",
 408         [CPU_SH5_101]   = "SH5-101",    [CPU_SH5_103]   = "SH5-103",
 409         [CPU_MXG]       = "MX-G",       [CPU_SH7723]    = "SH7723",
 410         [CPU_SH7366]    = "SH7366",     [CPU_SH_NONE]   = "Unknown"
 411 };
 412
 413 const char *get_cpu_subtype(struct sh_cpuinfo *c)
 414 {
 415         return cpu_name[c->type];
 416 }
 417 EXPORT_SYMBOL(get_cpu_subtype);
 418
 419 #ifdef CONFIG_PROC_FS
 420 /* Symbolic CPU flags, keep in sync with asm/cpu-features.h */
 421 static const char *cpu_flags[] = {
 422         "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr",
 423         "ptea", "llsc", "l2", "op32", NULL
 424 };
 425
 426 static void show_cpuflags(struct seq_file *m, struct sh_cpuinfo *c)
 427 {
 428         unsigned long i;
 429
 430         seq_printf(m, "cpu flags\t:");
 431
 432         if (!c->flags) {
 433                 seq_printf(m, " %s\n", cpu_flags[0]);
 434                 return;
 435         }
 436
 437         for (i = 0; cpu_flags[i]; i++)
 438                 if ((c->flags & (1 << i)))
 439                         seq_printf(m, " %s", cpu_flags[i+1]);
 440
 441         seq_printf(m, "\n");
 442 }
 443
 444 static void show_cacheinfo(struct seq_file *m, const char *type,
 445                            struct cache_info info)
 446 {
 447         unsigned int cache_size;
 448
 449         cache_size = info.ways * info.sets * info.linesz;
 450
 451         seq_printf(m, "%s size\t: %2dKiB (%d-way)\n",
 452                    type, cache_size >> 10, info.ways);
 453 }
 454
 455 /*
 456  *      Get CPU information for use by the procfs.
 457  */
 458 static int show_cpuinfo(struct seq_file *m, void *v)
 459 {
 460         struct sh_cpuinfo *c = v;
 461         unsigned int cpu = c - cpu_data;
 462
 463         if (!cpu_online(cpu))
 464                 return 0;
 465
 466         if (cpu == 0)
 467                 seq_printf(m, "machine\t\t: %s\n", get_system_type());
 468
 469         seq_printf(m, "processor\t: %d\n", cpu);
 470         seq_printf(m, "cpu family\t: %s\n", init_utsname()->machine);
 471         seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype(c));
 472         if (c->cut_major == -1)
 473                 seq_printf(m, "cut\t\t: unknown\n");
 474         else if (c->cut_minor == -1)
 475                 seq_printf(m, "cut\t\t: %d.x\n", c->cut_major);
 476         else
 477                 seq_printf(m, "cut\t\t: %d.%d\n", c->cut_major, c->cut_minor);
 478
 479         show_cpuflags(m, c);
 480
 481         seq_printf(m, "cache type\t: ");
 482
 483         /*
 484          * Check for what type of cache we have, we support both the
 485          * unified cache on the SH-2 and SH-3, as well as the harvard
 486          * style cache on the SH-4.
 487          */
 488         if (c->icache.flags & SH_CACHE_COMBINED) {
 489                 seq_printf(m, "unified\n");
 490                 show_cacheinfo(m, "cache", c->icache);
 491         } else {
 492                 seq_printf(m, "split (harvard)\n");
 493                 show_cacheinfo(m, "icache", c->icache);
 494                 show_cacheinfo(m, "dcache", c->dcache);
 495         }
 496
 497         /* Optional secondary cache */
 498         if (c->flags & CPU_HAS_L2_CACHE)
 499                 show_cacheinfo(m, "scache", c->scache);
 500
 501         seq_printf(m, "bogomips\t: %lu.%02lu\n",
 502                      c->loops_per_jiffy/(500000/HZ),
 503                      (c->loops_per_jiffy/(5000/HZ)) % 100);
 504
 505         return 0;
 506 }
 507
 508 static void *c_start(struct seq_file *m, loff_t *pos)
 509 {
 510         return *pos < NR_CPUS ? cpu_data + *pos : NULL;
 511 }
 512 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 513 {
 514         ++*pos;
 515         return c_start(m, pos);
 516 }
 517 static void c_stop(struct seq_file *m, void *v)
 518 {
 519 }
 520 const struct seq_operations cpuinfo_op = {
 521         .start  = c_start,
 522         .next   = c_next,
 523         .stop   = c_stop,
 524         .show   = show_cpuinfo,
 525 };
 526 #endif /* CONFIG_PROC_FS */
 527
 528 struct dentry *sh_debugfs_root;
 529
 530 static int __init sh_debugfs_init(void)
 531 {
 532         sh_debugfs_root = debugfs_create_dir("sh", NULL);
 533         if (IS_ERR(sh_debugfs_root))
 534                 return PTR_ERR(sh_debugfs_root);
 535
 536         return 0;
 537 }
 538 arch_initcall(sh_debugfs_init);