arch/mips/kernel/setup.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 1995 Linus Torvalds
   7  * Copyright (C) 1995 Waldorf Electronics
   8  * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 01, 02, 03  Ralf Baechle
   9  * Copyright (C) 1996 Stoned Elipot
  10  * Copyright (C) 1999 Silicon Graphics, Inc.
  11  * Copyright (C) 2000 2001, 2002  Maciej W. Rozycki
  12  */
  13 #include <linux/config.h>
  14 #include <linux/errno.h>
  15 #include <linux/init.h>
  16 #include <linux/ioport.h>
  17 #include <linux/sched.h>
  18 #include <linux/kernel.h>
  19 #include <linux/mm.h>
  20 #include <linux/module.h>
  21 #include <linux/stddef.h>
  22 #include <linux/string.h>
  23 #include <linux/unistd.h>
  24 #include <linux/slab.h>
  25 #include <linux/user.h>
  26 #include <linux/utsname.h>
  27 #include <linux/a.out.h>
  28 #include <linux/tty.h>
  29 #include <linux/bootmem.h>
  30 #include <linux/initrd.h>
  31 #include <linux/major.h>
  32 #include <linux/kdev_t.h>
  33 #include <linux/root_dev.h>
  34 #include <linux/highmem.h>
  35 #include <linux/console.h>
  36 #include <linux/mmzone.h>
  37
  38 #include <asm/addrspace.h>
  39 #include <asm/bootinfo.h>
  40 #include <asm/cpu.h>
  41 #include <asm/sections.h>
  42 #include <asm/setup.h>
  43 #include <asm/system.h>
  44
  45 struct cpuinfo_mips cpu_data[NR_CPUS];
  46
  47 EXPORT_SYMBOL(cpu_data);
  48
  49 #ifdef CONFIG_VT
  50 struct screen_info screen_info;
  51 #endif
  52
  53 /*
  54  * Despite it's name this variable is even if we don't have PCI
  55  */
  56 unsigned int PCI_DMA_BUS_IS_PHYS;
  57
  58 EXPORT_SYMBOL(PCI_DMA_BUS_IS_PHYS);
  59
  60 /*
  61  * Setup information
  62  *
  63  * These are initialized so they are in the .data section
  64  */
  65 unsigned long mips_machtype = MACH_UNKNOWN;
  66 unsigned long mips_machgroup = MACH_GROUP_UNKNOWN;
  67
  68 EXPORT_SYMBOL(mips_machtype);
  69 EXPORT_SYMBOL(mips_machgroup);
  70
  71 struct boot_mem_map boot_mem_map;
  72
  73 static char command_line[CL_SIZE];
  74        char arcs_cmdline[CL_SIZE]=CONFIG_CMDLINE;
  75
  76 /*
  77  * mips_io_port_base is the begin of the address space to which x86 style
  78  * I/O ports are mapped.
  79  */
  80 const unsigned long mips_io_port_base = -1;
  81 EXPORT_SYMBOL(mips_io_port_base);
  82
  83 /*
  84  * isa_slot_offset is the address where E(ISA) busaddress 0 is mapped
  85  * for the processor.
  86  */
  87 unsigned long isa_slot_offset;
  88 EXPORT_SYMBOL(isa_slot_offset);
  89
  90 static struct resource code_resource = { .name = "Kernel code", };
  91 static struct resource data_resource = { .name = "Kernel data", };
  92
  93 void __init add_memory_region(phys_t start, phys_t size, long type)
  94 {
  95         int x = boot_mem_map.nr_map;
  96         struct boot_mem_map_entry *prev = boot_mem_map.map + x - 1;
  97
  98         /*
  99          * Try to merge with previous entry if any.  This is far less than
 100          * perfect but is sufficient for most real world cases.
 101          */
 102         if (x && prev->addr + prev->size == start && prev->type == type) {
 103                 prev->size += size;
 104                 return;
 105         }
 106
 107         if (x == BOOT_MEM_MAP_MAX) {
 108                 printk("Ooops! Too many entries in the memory map!\n");
 109                 return;
 110         }
 111
 112         boot_mem_map.map[x].addr = start;
 113         boot_mem_map.map[x].size = size;
 114         boot_mem_map.map[x].type = type;
 115         boot_mem_map.nr_map++;
 116 }
 117
 118 static void __init print_memory_map(void)
 119 {
 120         int i;
 121         const int field = 2 * sizeof(unsigned long);
 122
 123         for (i = 0; i < boot_mem_map.nr_map; i++) {
 124                 printk(" memory: %0*Lx @ %0*Lx ",
 125                        field, (unsigned long long) boot_mem_map.map[i].size,
 126                        field, (unsigned long long) boot_mem_map.map[i].addr);
 127
 128                 switch (boot_mem_map.map[i].type) {
 129                 case BOOT_MEM_RAM:
 130                         printk("(usable)\n");
 131                         break;
 132                 case BOOT_MEM_ROM_DATA:
 133                         printk("(ROM data)\n");
 134                         break;
 135                 case BOOT_MEM_RESERVED:
 136                         printk("(reserved)\n");
 137                         break;
 138                 default:
 139                         printk("type %lu\n", boot_mem_map.map[i].type);
 140                         break;
 141                 }
 142         }
 143 }
 144
 145 static inline void parse_cmdline_early(void)
 146 {
 147         char c = ' ', *to = command_line, *from = saved_command_line;
 148         unsigned long start_at, mem_size;
 149         int len = 0;
 150         int usermem = 0;
 151
 152         printk("Determined physical RAM map:\n");
 153         print_memory_map();
 154
 155         for (;;) {
 156                 /*
 157                  * "mem=XXX[kKmM]" defines a memory region from
 158                  * 0 to <XXX>, overriding the determined size.
 159                  * "mem=XXX[KkmM]@YYY[KkmM]" defines a memory region from
 160                  * <YYY> to <YYY>+<XXX>, overriding the determined size.
 161                  */
 162                 if (c == ' ' && !memcmp(from, "mem=", 4)) {
 163                         if (to != command_line)
 164                                 to--;
 165                         /*
 166                          * If a user specifies memory size, we
 167                          * blow away any automatically generated
 168                          * size.
 169                          */
 170                         if (usermem == 0) {
 171                                 boot_mem_map.nr_map = 0;
 172                                 usermem = 1;
 173                         }
 174                         mem_size = memparse(from + 4, &from);
 175                         if (*from == '@')
 176                                 start_at = memparse(from + 1, &from);
 177                         else
 178                                 start_at = 0;
 179                         add_memory_region(start_at, mem_size, BOOT_MEM_RAM);
 180                 }
 181                 c = *(from++);
 182                 if (!c)
 183                         break;
 184                 if (CL_SIZE <= ++len)
 185                         break;
 186                 *(to++) = c;
 187         }
 188         *to = '\0';
 189
 190         if (usermem) {
 191                 printk("User-defined physical RAM map:\n");
 192                 print_memory_map();
 193         }
 194 }
 195
 196 static inline int parse_rd_cmdline(unsigned long* rd_start, unsigned long* rd_end)
 197 {
 198         /*
 199          * "rd_start=0xNNNNNNNN" defines the memory address of an initrd
 200          * "rd_size=0xNN" it's size
 201          */
 202         unsigned long start = 0;
 203         unsigned long size = 0;
 204         unsigned long end;
 205         char cmd_line[CL_SIZE];
 206         char *start_str;
 207         char *size_str;
 208         char *tmp;
 209
 210         strcpy(cmd_line, command_line);
 211         *command_line = 0;
 212         tmp = cmd_line;
 213         /* Ignore "rd_start=" strings in other parameters. */
 214         start_str = strstr(cmd_line, "rd_start=");
 215         if (start_str && start_str != cmd_line && *(start_str - 1) != ' ')
 216                 start_str = strstr(start_str, " rd_start=");
 217         while (start_str) {
 218                 if (start_str != cmd_line)
 219                         strncat(command_line, tmp, start_str - tmp);
 220                 start = memparse(start_str + 9, &start_str);
 221                 tmp = start_str + 1;
 222                 start_str = strstr(start_str, " rd_start=");
 223         }
 224         if (*tmp)
 225                 strcat(command_line, tmp);
 226
 227         strcpy(cmd_line, command_line);
 228         *command_line = 0;
 229         tmp = cmd_line;
 230         /* Ignore "rd_size" strings in other parameters. */
 231         size_str = strstr(cmd_line, "rd_size=");
 232         if (size_str && size_str != cmd_line && *(size_str - 1) != ' ')
 233                 size_str = strstr(size_str, " rd_size=");
 234         while (size_str) {
 235                 if (size_str != cmd_line)
 236                         strncat(command_line, tmp, size_str - tmp);
 237                 size = memparse(size_str + 8, &size_str);
 238                 tmp = size_str + 1;
 239                 size_str = strstr(size_str, " rd_size=");
 240         }
 241         if (*tmp)
 242                 strcat(command_line, tmp);
 243
 244 #ifdef CONFIG_64BIT
 245         /* HACK: Guess if the sign extension was forgotten */
 246         if (start > 0x0000000080000000 && start < 0x00000000ffffffff)
 247                 start |= 0xffffffff00000000;
 248 #endif
 249
 250         end = start + size;
 251         if (start && end) {
 252                 *rd_start = start;
 253                 *rd_end = end;
 254                 return 1;
 255         }
 256         return 0;
 257 }
 258
 259 #define PFN_UP(x)       (((x) + PAGE_SIZE - 1) >> PAGE_SHIFT)
 260 #define PFN_DOWN(x)     ((x) >> PAGE_SHIFT)
 261 #define PFN_PHYS(x)     ((x) << PAGE_SHIFT)
 262
 263 #define MAXMEM          HIGHMEM_START
 264 #define MAXMEM_PFN      PFN_DOWN(MAXMEM)
 265
 266 static inline void bootmem_init(void)
 267 {
 268         unsigned long start_pfn;
 269         unsigned long reserved_end = (unsigned long)&_end;
 270 #ifndef CONFIG_SGI_IP27
 271         unsigned long first_usable_pfn;
 272         unsigned long bootmap_size;
 273         int i;
 274 #endif
 275 #ifdef CONFIG_BLK_DEV_INITRD
 276         int initrd_reserve_bootmem = 0;
 277
 278         /* Board specific code should have set up initrd_start and initrd_end */
 279         ROOT_DEV = Root_RAM0;
 280         if (parse_rd_cmdline(&initrd_start, &initrd_end)) {
 281                 reserved_end = max(reserved_end, initrd_end);
 282                 initrd_reserve_bootmem = 1;
 283         } else {
 284                 unsigned long tmp;
 285                 u32 *initrd_header;
 286
 287                 tmp = ((reserved_end + PAGE_SIZE-1) & PAGE_MASK) - sizeof(u32) * 2;
 288                 if (tmp < reserved_end)
 289                         tmp += PAGE_SIZE;
 290                 initrd_header = (u32 *)tmp;
 291                 if (initrd_header[0] == 0x494E5244) {
 292                         initrd_start = (unsigned long)&initrd_header[2];
 293                         initrd_end = initrd_start + initrd_header[1];
 294                         reserved_end = max(reserved_end, initrd_end);
 295                         initrd_reserve_bootmem = 1;
 296                 }
 297         }
 298 #endif  /* CONFIG_BLK_DEV_INITRD */
 299
 300         /*
 301          * Partially used pages are not usable - thus
 302          * we are rounding upwards.
 303          */
 304         start_pfn = PFN_UP(CPHYSADDR(reserved_end));
 305
 306 #ifndef CONFIG_SGI_IP27
 307         /* Find the highest page frame number we have available.  */
 308         max_pfn = 0;
 309         first_usable_pfn = -1UL;
 310         for (i = 0; i < boot_mem_map.nr_map; i++) {
 311                 unsigned long start, end;
 312
 313                 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
 314                         continue;
 315
 316                 start = PFN_UP(boot_mem_map.map[i].addr);
 317                 end = PFN_DOWN(boot_mem_map.map[i].addr
 318                       + boot_mem_map.map[i].size);
 319
 320                 if (start >= end)
 321                         continue;
 322                 if (end > max_pfn)
 323                         max_pfn = end;
 324                 if (start < first_usable_pfn) {
 325                         if (start > start_pfn) {
 326                                 first_usable_pfn = start;
 327                         } else if (end > start_pfn) {
 328                                 first_usable_pfn = start_pfn;
 329                         }
 330                 }
 331         }
 332
 333         /*
 334          * Determine low and high memory ranges
 335          */
 336         max_low_pfn = max_pfn;
 337         if (max_low_pfn > MAXMEM_PFN) {
 338                 max_low_pfn = MAXMEM_PFN;
 339 #ifndef CONFIG_HIGHMEM
 340                 /* Maximum memory usable is what is directly addressable */
 341                 printk(KERN_WARNING "Warning only %ldMB will be used.\n",
 342                        MAXMEM >> 20);
 343                 printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
 344 #endif
 345         }
 346
 347 #ifdef CONFIG_HIGHMEM
 348         /*
 349          * Crude, we really should make a better attempt at detecting
 350          * highstart_pfn
 351          */
 352         highstart_pfn = highend_pfn = max_pfn;
 353         if (max_pfn > MAXMEM_PFN) {
 354                 highstart_pfn = MAXMEM_PFN;
 355                 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
 356                        (highend_pfn - highstart_pfn) >> (20 - PAGE_SHIFT));
 357         }
 358 #endif
 359
 360         memory_present(0, first_usable_pfn, max_low_pfn);
 361
 362         /* Initialize the boot-time allocator with low memory only.  */
 363         bootmap_size = init_bootmem(first_usable_pfn, max_low_pfn);
 364
 365         /*
 366          * Register fully available low RAM pages with the bootmem allocator.
 367          */
 368         for (i = 0; i < boot_mem_map.nr_map; i++) {
 369                 unsigned long curr_pfn, last_pfn, size;
 370
 371                 /*
 372                  * Reserve usable memory.
 373                  */
 374                 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
 375                         continue;
 376
 377                 /*
 378                  * We are rounding up the start address of usable memory:
 379                  */
 380                 curr_pfn = PFN_UP(boot_mem_map.map[i].addr);
 381                 if (curr_pfn >= max_low_pfn)
 382                         continue;
 383                 if (curr_pfn < start_pfn)
 384                         curr_pfn = start_pfn;
 385
 386                 /*
 387                  * ... and at the end of the usable range downwards:
 388                  */
 389                 last_pfn = PFN_DOWN(boot_mem_map.map[i].addr
 390                                     + boot_mem_map.map[i].size);
 391
 392                 if (last_pfn > max_low_pfn)
 393                         last_pfn = max_low_pfn;
 394
 395                 /*
 396                  * Only register lowmem part of lowmem segment with bootmem.
 397                  */
 398                 size = last_pfn - curr_pfn;
 399                 if (curr_pfn > PFN_DOWN(HIGHMEM_START))
 400                         continue;
 401                 if (curr_pfn + size - 1 > PFN_DOWN(HIGHMEM_START))
 402                         size = PFN_DOWN(HIGHMEM_START) - curr_pfn;
 403                 if (!size)
 404                         continue;
 405
 406                 /*
 407                  * ... finally, did all the rounding and playing
 408                  * around just make the area go away?
 409                  */
 410                 if (last_pfn <= curr_pfn)
 411                         continue;
 412
 413                 /* Register lowmem ranges */
 414                 free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size));
 415         }
 416
 417         /* Reserve the bootmap memory.  */
 418         reserve_bootmem(PFN_PHYS(first_usable_pfn), bootmap_size);
 419 #endif /* CONFIG_SGI_IP27 */
 420
 421 #ifdef CONFIG_BLK_DEV_INITRD
 422         initrd_below_start_ok = 1;
 423         if (initrd_start) {
 424                 unsigned long initrd_size = ((unsigned char *)initrd_end) - ((unsigned char *)initrd_start);
 425                 printk("Initial ramdisk at: 0x%p (%lu bytes)\n",
 426                        (void *)initrd_start, initrd_size);
 427
 428                 if (CPHYSADDR(initrd_end) > PFN_PHYS(max_low_pfn)) {
 429                         printk("initrd extends beyond end of memory "
 430                                "(0x%0*Lx > 0x%0*Lx)\ndisabling initrd\n",
 431                                sizeof(long) * 2,
 432                                (unsigned long long)CPHYSADDR(initrd_end),
 433                                sizeof(long) * 2,
 434                                (unsigned long long)PFN_PHYS(max_low_pfn));
 435                         initrd_start = initrd_end = 0;
 436                         initrd_reserve_bootmem = 0;
 437                 }
 438
 439                 if (initrd_reserve_bootmem)
 440                         reserve_bootmem(CPHYSADDR(initrd_start), initrd_size);
 441         }
 442 #endif /* CONFIG_BLK_DEV_INITRD  */
 443 }
 444
 445 static inline void resource_init(void)
 446 {
 447         int i;
 448
 449 #if defined(CONFIG_64BIT) && !defined(CONFIG_BUILD_ELF64)
 450         /*
 451          * The 64bit code in 32bit object format trick can't represent
 452          * 64bit wide relocations for linker script symbols.
 453          */
 454         code_resource.start = CPHYSADDR(&_text);
 455         code_resource.end = CPHYSADDR(&_etext) - 1;
 456         data_resource.start = CPHYSADDR(&_etext);
 457         data_resource.end = CPHYSADDR(&_edata) - 1;
 458 #else
 459         code_resource.start = virt_to_phys(&_text);
 460         code_resource.end = virt_to_phys(&_etext) - 1;
 461         data_resource.start = virt_to_phys(&_etext);
 462         data_resource.end = virt_to_phys(&_edata) - 1;
 463 #endif
 464
 465         /*
 466          * Request address space for all standard RAM.
 467          */
 468         for (i = 0; i < boot_mem_map.nr_map; i++) {
 469                 struct resource *res;
 470                 unsigned long start, end;
 471
 472                 start = boot_mem_map.map[i].addr;
 473                 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
 474                 if (start >= MAXMEM)
 475                         continue;
 476                 if (end >= MAXMEM)
 477                         end = MAXMEM - 1;
 478
 479                 res = alloc_bootmem(sizeof(struct resource));
 480                 switch (boot_mem_map.map[i].type) {
 481                 case BOOT_MEM_RAM:
 482                 case BOOT_MEM_ROM_DATA:
 483                         res->name = "System RAM";
 484                         break;
 485                 case BOOT_MEM_RESERVED:
 486                 default:
 487                         res->name = "reserved";
 488                 }
 489
 490                 res->start = start;
 491                 res->end = end;
 492
 493                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 494                 request_resource(&iomem_resource, res);
 495
 496                 /*
 497                  *  We don't know which RAM region contains kernel data,
 498                  *  so we try it repeatedly and let the resource manager
 499                  *  test it.
 500                  */
 501                 request_resource(res, &code_resource);
 502                 request_resource(res, &data_resource);
 503         }
 504 }
 505
 506 #undef PFN_UP
 507 #undef PFN_DOWN
 508 #undef PFN_PHYS
 509
 510 #undef MAXMEM
 511 #undef MAXMEM_PFN
 512
 513 extern void plat_setup(void);
 514
 515 void __init setup_arch(char **cmdline_p)
 516 {
 517         cpu_probe();
 518         prom_init();
 519         cpu_report();
 520
 521 #if defined(CONFIG_VT)
 522 #if defined(CONFIG_VGA_CONSOLE)
 523         conswitchp = &vga_con;
 524 #elif defined(CONFIG_DUMMY_CONSOLE)
 525         conswitchp = &dummy_con;
 526 #endif
 527 #endif
 528
 529         /* call board setup routine */
 530         plat_setup();
 531
 532         strlcpy(command_line, arcs_cmdline, sizeof(command_line));
 533         strlcpy(saved_command_line, command_line, COMMAND_LINE_SIZE);
 534
 535         *cmdline_p = command_line;
 536
 537         parse_cmdline_early();
 538         bootmem_init();
 539         sparse_init();
 540         paging_init();
 541         resource_init();
 542 }
 543
 544 int __init fpu_disable(char *s)
 545 {
 546         cpu_data[0].options &= ~MIPS_CPU_FPU;
 547
 548         return 1;
 549 }
 550
 551 __setup("nofpu", fpu_disable);