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
  37 #include <asm/addrspace.h>
  38 #include <asm/bootinfo.h>
  39 #include <asm/cpu.h>
  40 #include <asm/sections.h>
  41 #include <asm/setup.h>
  42 #include <asm/system.h>
  43
  44 struct cpuinfo_mips cpu_data[NR_CPUS];
  45
  46 EXPORT_SYMBOL(cpu_data);
  47
  48 #ifdef CONFIG_VT
  49 struct screen_info screen_info;
  50 #endif
  51
  52 /*
  53  * Despite it's name this variable is even if we don't have PCI
  54  */
  55 unsigned int PCI_DMA_BUS_IS_PHYS;
  56
  57 EXPORT_SYMBOL(PCI_DMA_BUS_IS_PHYS);
  58
  59 /*
  60  * Setup information
  61  *
  62  * These are initialized so they are in the .data section
  63  */
  64 unsigned long mips_machtype = MACH_UNKNOWN;
  65 unsigned long mips_machgroup = MACH_GROUP_UNKNOWN;
  66
  67 EXPORT_SYMBOL(mips_machtype);
  68 EXPORT_SYMBOL(mips_machgroup);
  69
  70 struct boot_mem_map boot_mem_map;
  71
  72 static char command_line[CL_SIZE];
  73        char arcs_cmdline[CL_SIZE]=CONFIG_CMDLINE;
  74
  75 /*
  76  * mips_io_port_base is the begin of the address space to which x86 style
  77  * I/O ports are mapped.
  78  */
  79 const unsigned long mips_io_port_base = -1;
  80 EXPORT_SYMBOL(mips_io_port_base);
  81
  82 /*
  83  * isa_slot_offset is the address where E(ISA) busaddress 0 is mapped
  84  * for the processor.
  85  */
  86 unsigned long isa_slot_offset;
  87 EXPORT_SYMBOL(isa_slot_offset);
  88
  89 static struct resource code_resource = { .name = "Kernel code", };
  90 static struct resource data_resource = { .name = "Kernel data", };
  91
  92 void __init add_memory_region(phys_t start, phys_t size, long type)
  93 {
  94         int x = boot_mem_map.nr_map;
  95         struct boot_mem_map_entry *prev = boot_mem_map.map + x - 1;
  96
  97         /*
  98          * Try to merge with previous entry if any.  This is far less than
  99          * perfect but is sufficient for most real world cases.
 100          */
 101         if (x && prev->addr + prev->size == start && prev->type == type) {
 102                 prev->size += size;
 103                 return;
 104         }
 105
 106         if (x == BOOT_MEM_MAP_MAX) {
 107                 printk("Ooops! Too many entries in the memory map!\n");
 108                 return;
 109         }
 110
 111         boot_mem_map.map[x].addr = start;
 112         boot_mem_map.map[x].size = size;
 113         boot_mem_map.map[x].type = type;
 114         boot_mem_map.nr_map++;
 115 }
 116
 117 static void __init print_memory_map(void)
 118 {
 119         int i;
 120         const int field = 2 * sizeof(unsigned long);
 121
 122         for (i = 0; i < boot_mem_map.nr_map; i++) {
 123                 printk(" memory: %0*Lx @ %0*Lx ",
 124                        field, (unsigned long long) boot_mem_map.map[i].size,
 125                        field, (unsigned long long) boot_mem_map.map[i].addr);
 126
 127                 switch (boot_mem_map.map[i].type) {
 128                 case BOOT_MEM_RAM:
 129                         printk("(usable)\n");
 130                         break;
 131                 case BOOT_MEM_ROM_DATA:
 132                         printk("(ROM data)\n");
 133                         break;
 134                 case BOOT_MEM_RESERVED:
 135                         printk("(reserved)\n");
 136                         break;
 137                 default:
 138                         printk("type %lu\n", boot_mem_map.map[i].type);
 139                         break;
 140                 }
 141         }
 142 }
 143
 144 static inline void parse_cmdline_early(void)
 145 {
 146         char c = ' ', *to = command_line, *from = saved_command_line;
 147         unsigned long start_at, mem_size;
 148         int len = 0;
 149         int usermem = 0;
 150
 151         printk("Determined physical RAM map:\n");
 152         print_memory_map();
 153
 154         for (;;) {
 155                 /*
 156                  * "mem=XXX[kKmM]" defines a memory region from
 157                  * 0 to <XXX>, overriding the determined size.
 158                  * "mem=XXX[KkmM]@YYY[KkmM]" defines a memory region from
 159                  * <YYY> to <YYY>+<XXX>, overriding the determined size.
 160                  */
 161                 if (c == ' ' && !memcmp(from, "mem=", 4)) {
 162                         if (to != command_line)
 163                                 to--;
 164                         /*
 165                          * If a user specifies memory size, we
 166                          * blow away any automatically generated
 167                          * size.
 168                          */
 169                         if (usermem == 0) {
 170                                 boot_mem_map.nr_map = 0;
 171                                 usermem = 1;
 172                         }
 173                         mem_size = memparse(from + 4, &from);
 174                         if (*from == '@')
 175                                 start_at = memparse(from + 1, &from);
 176                         else
 177                                 start_at = 0;
 178                         add_memory_region(start_at, mem_size, BOOT_MEM_RAM);
 179                 }
 180                 c = *(from++);
 181                 if (!c)
 182                         break;
 183                 if (CL_SIZE <= ++len)
 184                         break;
 185                 *(to++) = c;
 186         }
 187         *to = '\0';
 188
 189         if (usermem) {
 190                 printk("User-defined physical RAM map:\n");
 191                 print_memory_map();
 192         }
 193 }
 194
 195 static inline int parse_rd_cmdline(unsigned long* rd_start, unsigned long* rd_end)
 196 {
 197         /*
 198          * "rd_start=0xNNNNNNNN" defines the memory address of an initrd
 199          * "rd_size=0xNN" it's size
 200          */
 201         unsigned long start = 0;
 202         unsigned long size = 0;
 203         unsigned long end;
 204         char cmd_line[CL_SIZE];
 205         char *start_str;
 206         char *size_str;
 207         char *tmp;
 208
 209         strcpy(cmd_line, command_line);
 210         *command_line = 0;
 211         tmp = cmd_line;
 212         /* Ignore "rd_start=" strings in other parameters. */
 213         start_str = strstr(cmd_line, "rd_start=");
 214         if (start_str && start_str != cmd_line && *(start_str - 1) != ' ')
 215                 start_str = strstr(start_str, " rd_start=");
 216         while (start_str) {
 217                 if (start_str != cmd_line)
 218                         strncat(command_line, tmp, start_str - tmp);
 219                 start = memparse(start_str + 9, &start_str);
 220                 tmp = start_str + 1;
 221                 start_str = strstr(start_str, " rd_start=");
 222         }
 223         if (*tmp)
 224                 strcat(command_line, tmp);
 225
 226         strcpy(cmd_line, command_line);
 227         *command_line = 0;
 228         tmp = cmd_line;
 229         /* Ignore "rd_size" strings in other parameters. */
 230         size_str = strstr(cmd_line, "rd_size=");
 231         if (size_str && size_str != cmd_line && *(size_str - 1) != ' ')
 232                 size_str = strstr(size_str, " rd_size=");
 233         while (size_str) {
 234                 if (size_str != cmd_line)
 235                         strncat(command_line, tmp, size_str - tmp);
 236                 size = memparse(size_str + 8, &size_str);
 237                 tmp = size_str + 1;
 238                 size_str = strstr(size_str, " rd_size=");
 239         }
 240         if (*tmp)
 241                 strcat(command_line, tmp);
 242
 243 #ifdef CONFIG_MIPS64
 244         /* HACK: Guess if the sign extension was forgotten */
 245         if (start > 0x0000000080000000 && start < 0x00000000ffffffff)
 246                 start |= 0xffffffff00000000;
 247 #endif
 248
 249         end = start + size;
 250         if (start && end) {
 251                 *rd_start = start;
 252                 *rd_end = end;
 253                 return 1;
 254         }
 255         return 0;
 256 }
 257
 258 #define PFN_UP(x)       (((x) + PAGE_SIZE - 1) >> PAGE_SHIFT)
 259 #define PFN_DOWN(x)     ((x) >> PAGE_SHIFT)
 260 #define PFN_PHYS(x)     ((x) << PAGE_SHIFT)
 261
 262 #define MAXMEM          HIGHMEM_START
 263 #define MAXMEM_PFN      PFN_DOWN(MAXMEM)
 264
 265 static inline void bootmem_init(void)
 266 {
 267         unsigned long start_pfn;
 268         unsigned long reserved_end = (unsigned long)&_end;
 269 #ifndef CONFIG_SGI_IP27
 270         unsigned long first_usable_pfn;
 271         unsigned long bootmap_size;
 272         int i;
 273 #endif
 274 #ifdef CONFIG_BLK_DEV_INITRD
 275         int initrd_reserve_bootmem = 0;
 276
 277         /* Board specific code should have set up initrd_start and initrd_end */
 278         ROOT_DEV = Root_RAM0;
 279         if (parse_rd_cmdline(&initrd_start, &initrd_end)) {
 280                 reserved_end = max(reserved_end, initrd_end);
 281                 initrd_reserve_bootmem = 1;
 282         } else {
 283                 unsigned long tmp;
 284                 u32 *initrd_header;
 285
 286                 tmp = ((reserved_end + PAGE_SIZE-1) & PAGE_MASK) - sizeof(u32) * 2;
 287                 if (tmp < reserved_end)
 288                         tmp += PAGE_SIZE;
 289                 initrd_header = (u32 *)tmp;
 290                 if (initrd_header[0] == 0x494E5244) {
 291                         initrd_start = (unsigned long)&initrd_header[2];
 292                         initrd_end = initrd_start + initrd_header[1];
 293                         reserved_end = max(reserved_end, initrd_end);
 294                         initrd_reserve_bootmem = 1;
 295                 }
 296         }
 297 #endif  /* CONFIG_BLK_DEV_INITRD */
 298
 299         /*
 300          * Partially used pages are not usable - thus
 301          * we are rounding upwards.
 302          */
 303         start_pfn = PFN_UP(CPHYSADDR(reserved_end));
 304
 305 #ifndef CONFIG_SGI_IP27
 306         /* Find the highest page frame number we have available.  */
 307         max_pfn = 0;
 308         first_usable_pfn = -1UL;
 309         for (i = 0; i < boot_mem_map.nr_map; i++) {
 310                 unsigned long start, end;
 311
 312                 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
 313                         continue;
 314
 315                 start = PFN_UP(boot_mem_map.map[i].addr);
 316                 end = PFN_DOWN(boot_mem_map.map[i].addr
 317                       + boot_mem_map.map[i].size);
 318
 319                 if (start >= end)
 320                         continue;
 321                 if (end > max_pfn)
 322                         max_pfn = end;
 323                 if (start < first_usable_pfn) {
 324                         if (start > start_pfn) {
 325                                 first_usable_pfn = start;
 326                         } else if (end > start_pfn) {
 327                                 first_usable_pfn = start_pfn;
 328                         }
 329                 }
 330         }
 331
 332         /*
 333          * Determine low and high memory ranges
 334          */
 335         max_low_pfn = max_pfn;
 336         if (max_low_pfn > MAXMEM_PFN) {
 337                 max_low_pfn = MAXMEM_PFN;
 338 #ifndef CONFIG_HIGHMEM
 339                 /* Maximum memory usable is what is directly addressable */
 340                 printk(KERN_WARNING "Warning only %ldMB will be used.\n",
 341                        MAXMEM >> 20);
 342                 printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
 343 #endif
 344         }
 345
 346 #ifdef CONFIG_HIGHMEM
 347         /*
 348          * Crude, we really should make a better attempt at detecting
 349          * highstart_pfn
 350          */
 351         highstart_pfn = highend_pfn = max_pfn;
 352         if (max_pfn > MAXMEM_PFN) {
 353                 highstart_pfn = MAXMEM_PFN;
 354                 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
 355                        (highend_pfn - highstart_pfn) >> (20 - PAGE_SHIFT));
 356         }
 357 #endif
 358
 359         /* Initialize the boot-time allocator with low memory only.  */
 360         bootmap_size = init_bootmem(first_usable_pfn, max_low_pfn);
 361
 362         /*
 363          * Register fully available low RAM pages with the bootmem allocator.
 364          */
 365         for (i = 0; i < boot_mem_map.nr_map; i++) {
 366                 unsigned long curr_pfn, last_pfn, size;
 367
 368                 /*
 369                  * Reserve usable memory.
 370                  */
 371                 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
 372                         continue;
 373
 374                 /*
 375                  * We are rounding up the start address of usable memory:
 376                  */
 377                 curr_pfn = PFN_UP(boot_mem_map.map[i].addr);
 378                 if (curr_pfn >= max_low_pfn)
 379                         continue;
 380                 if (curr_pfn < start_pfn)
 381                         curr_pfn = start_pfn;
 382
 383                 /*
 384                  * ... and at the end of the usable range downwards:
 385                  */
 386                 last_pfn = PFN_DOWN(boot_mem_map.map[i].addr
 387                                     + boot_mem_map.map[i].size);
 388
 389                 if (last_pfn > max_low_pfn)
 390                         last_pfn = max_low_pfn;
 391
 392                 /*
 393                  * Only register lowmem part of lowmem segment with bootmem.
 394                  */
 395                 size = last_pfn - curr_pfn;
 396                 if (curr_pfn > PFN_DOWN(HIGHMEM_START))
 397                         continue;
 398                 if (curr_pfn + size - 1 > PFN_DOWN(HIGHMEM_START))
 399                         size = PFN_DOWN(HIGHMEM_START) - curr_pfn;
 400                 if (!size)
 401                         continue;
 402
 403                 /*
 404                  * ... finally, did all the rounding and playing
 405                  * around just make the area go away?
 406                  */
 407                 if (last_pfn <= curr_pfn)
 408                         continue;
 409
 410                 /* Register lowmem ranges */
 411                 free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size));
 412         }
 413
 414         /* Reserve the bootmap memory.  */
 415         reserve_bootmem(PFN_PHYS(first_usable_pfn), bootmap_size);
 416 #endif /* CONFIG_SGI_IP27 */
 417
 418 #ifdef CONFIG_BLK_DEV_INITRD
 419         initrd_below_start_ok = 1;
 420         if (initrd_start) {
 421                 unsigned long initrd_size = ((unsigned char *)initrd_end) - ((unsigned char *)initrd_start);
 422                 printk("Initial ramdisk at: 0x%p (%lu bytes)\n",
 423                        (void *)initrd_start, initrd_size);
 424
 425                 if (CPHYSADDR(initrd_end) > PFN_PHYS(max_low_pfn)) {
 426                         printk("initrd extends beyond end of memory "
 427                                "(0x%0*Lx > 0x%0*Lx)\ndisabling initrd\n",
 428                                sizeof(long) * 2,
 429                                (unsigned long long)CPHYSADDR(initrd_end),
 430                                sizeof(long) * 2,
 431                                (unsigned long long)PFN_PHYS(max_low_pfn));
 432                         initrd_start = initrd_end = 0;
 433                         initrd_reserve_bootmem = 0;
 434                 }
 435
 436                 if (initrd_reserve_bootmem)
 437                         reserve_bootmem(CPHYSADDR(initrd_start), initrd_size);
 438         }
 439 #endif /* CONFIG_BLK_DEV_INITRD  */
 440 }
 441
 442 static inline void resource_init(void)
 443 {
 444         int i;
 445
 446 #if defined(CONFIG_MIPS64) && !defined(CONFIG_BUILD_ELF64)
 447         /*
 448          * The 64bit code in 32bit object format trick can't represent
 449          * 64bit wide relocations for linker script symbols.
 450          */
 451         code_resource.start = CPHYSADDR(&_text);
 452         code_resource.end = CPHYSADDR(&_etext) - 1;
 453         data_resource.start = CPHYSADDR(&_etext);
 454         data_resource.end = CPHYSADDR(&_edata) - 1;
 455 #else
 456         code_resource.start = virt_to_phys(&_text);
 457         code_resource.end = virt_to_phys(&_etext) - 1;
 458         data_resource.start = virt_to_phys(&_etext);
 459         data_resource.end = virt_to_phys(&_edata) - 1;
 460 #endif
 461
 462         /*
 463          * Request address space for all standard RAM.
 464          */
 465         for (i = 0; i < boot_mem_map.nr_map; i++) {
 466                 struct resource *res;
 467                 unsigned long start, end;
 468
 469                 start = boot_mem_map.map[i].addr;
 470                 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
 471                 if (start >= MAXMEM)
 472                         continue;
 473                 if (end >= MAXMEM)
 474                         end = MAXMEM - 1;
 475
 476                 res = alloc_bootmem(sizeof(struct resource));
 477                 switch (boot_mem_map.map[i].type) {
 478                 case BOOT_MEM_RAM:
 479                 case BOOT_MEM_ROM_DATA:
 480                         res->name = "System RAM";
 481                         break;
 482                 case BOOT_MEM_RESERVED:
 483                 default:
 484                         res->name = "reserved";
 485                 }
 486
 487                 res->start = start;
 488                 res->end = end;
 489
 490                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 491                 request_resource(&iomem_resource, res);
 492
 493                 /*
 494                  *  We don't know which RAM region contains kernel data,
 495                  *  so we try it repeatedly and let the resource manager
 496                  *  test it.
 497                  */
 498                 request_resource(res, &code_resource);
 499                 request_resource(res, &data_resource);
 500         }
 501 }
 502
 503 #undef PFN_UP
 504 #undef PFN_DOWN
 505 #undef PFN_PHYS
 506
 507 #undef MAXMEM
 508 #undef MAXMEM_PFN
 509
 510 static int __initdata earlyinit_debug;
 511
 512 static int __init earlyinit_debug_setup(char *str)
 513 {
 514         earlyinit_debug = 1;
 515         return 1;
 516 }
 517 __setup("earlyinit_debug", earlyinit_debug_setup);
 518
 519 extern initcall_t __earlyinitcall_start, __earlyinitcall_end;
 520
 521 static void __init do_earlyinitcalls(void)
 522 {
 523         initcall_t *call, *start, *end;
 524
 525         start = &__earlyinitcall_start;
 526         end = &__earlyinitcall_end;
 527
 528         for (call = start; call < end; call++) {
 529                 if (earlyinit_debug)
 530                         printk("calling earlyinitcall 0x%p\n", *call);
 531
 532                 (*call)();
 533         }
 534 }
 535
 536 void __init setup_arch(char **cmdline_p)
 537 {
 538         cpu_probe();
 539         prom_init();
 540         cpu_report();
 541
 542 #if defined(CONFIG_VT)
 543 #if defined(CONFIG_VGA_CONSOLE)
 544         conswitchp = &vga_con;
 545 #elif defined(CONFIG_DUMMY_CONSOLE)
 546         conswitchp = &dummy_con;
 547 #endif
 548 #endif
 549
 550         /* call board setup routine */
 551         do_earlyinitcalls();
 552
 553         strlcpy(command_line, arcs_cmdline, sizeof(command_line));
 554         strlcpy(saved_command_line, command_line, COMMAND_LINE_SIZE);
 555
 556         *cmdline_p = command_line;
 557
 558         parse_cmdline_early();
 559         bootmem_init();
 560         paging_init();
 561         resource_init();
 562 }
 563
 564 int __init fpu_disable(char *s)
 565 {
 566         cpu_data[0].options &= ~MIPS_CPU_FPU;
 567
 568         return 1;
 569 }
 570
 571 __setup("nofpu", fpu_disable);