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 #include <linux/pfn.h>
  38
  39 #include <asm/addrspace.h>
  40 #include <asm/bootinfo.h>
  41 #include <asm/cache.h>
  42 #include <asm/cpu.h>
  43 #include <asm/sections.h>
  44 #include <asm/setup.h>
  45 #include <asm/system.h>
  46
  47 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
  48
  49 EXPORT_SYMBOL(cpu_data);
  50
  51 #ifdef CONFIG_VT
  52 struct screen_info screen_info;
  53 #endif
  54
  55 /*
  56  * Despite it's name this variable is even if we don't have PCI
  57  */
  58 unsigned int PCI_DMA_BUS_IS_PHYS;
  59
  60 EXPORT_SYMBOL(PCI_DMA_BUS_IS_PHYS);
  61
  62 /*
  63  * Setup information
  64  *
  65  * These are initialized so they are in the .data section
  66  */
  67 unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
  68 unsigned long mips_machgroup __read_mostly = MACH_GROUP_UNKNOWN;
  69
  70 EXPORT_SYMBOL(mips_machtype);
  71 EXPORT_SYMBOL(mips_machgroup);
  72
  73 struct boot_mem_map boot_mem_map;
  74
  75 static char command_line[CL_SIZE];
  76        char arcs_cmdline[CL_SIZE]=CONFIG_CMDLINE;
  77
  78 /*
  79  * mips_io_port_base is the begin of the address space to which x86 style
  80  * I/O ports are mapped.
  81  */
  82 const unsigned long mips_io_port_base __read_mostly = -1;
  83 EXPORT_SYMBOL(mips_io_port_base);
  84
  85 /*
  86  * isa_slot_offset is the address where E(ISA) busaddress 0 is mapped
  87  * for the processor.
  88  */
  89 unsigned long isa_slot_offset;
  90 EXPORT_SYMBOL(isa_slot_offset);
  91
  92 static struct resource code_resource = { .name = "Kernel code", };
  93 static struct resource data_resource = { .name = "Kernel data", };
  94
  95 void __init add_memory_region(phys_t start, phys_t size, long type)
  96 {
  97         int x = boot_mem_map.nr_map;
  98         struct boot_mem_map_entry *prev = boot_mem_map.map + x - 1;
  99
 100         /*
 101          * Try to merge with previous entry if any.  This is far less than
 102          * perfect but is sufficient for most real world cases.
 103          */
 104         if (x && prev->addr + prev->size == start && prev->type == type) {
 105                 prev->size += size;
 106                 return;
 107         }
 108
 109         if (x == BOOT_MEM_MAP_MAX) {
 110                 printk("Ooops! Too many entries in the memory map!\n");
 111                 return;
 112         }
 113
 114         boot_mem_map.map[x].addr = start;
 115         boot_mem_map.map[x].size = size;
 116         boot_mem_map.map[x].type = type;
 117         boot_mem_map.nr_map++;
 118 }
 119
 120 static void __init print_memory_map(void)
 121 {
 122         int i;
 123         const int field = 2 * sizeof(unsigned long);
 124
 125         for (i = 0; i < boot_mem_map.nr_map; i++) {
 126                 printk(" memory: %0*Lx @ %0*Lx ",
 127                        field, (unsigned long long) boot_mem_map.map[i].size,
 128                        field, (unsigned long long) boot_mem_map.map[i].addr);
 129
 130                 switch (boot_mem_map.map[i].type) {
 131                 case BOOT_MEM_RAM:
 132                         printk("(usable)\n");
 133                         break;
 134                 case BOOT_MEM_ROM_DATA:
 135                         printk("(ROM data)\n");
 136                         break;
 137                 case BOOT_MEM_RESERVED:
 138                         printk("(reserved)\n");
 139                         break;
 140                 default:
 141                         printk("type %lu\n", boot_mem_map.map[i].type);
 142                         break;
 143                 }
 144         }
 145 }
 146
 147 static inline void parse_cmdline_early(void)
 148 {
 149         char c = ' ', *to = command_line, *from = saved_command_line;
 150         unsigned long start_at, mem_size;
 151         int len = 0;
 152         int usermem = 0;
 153
 154         printk("Determined physical RAM map:\n");
 155         print_memory_map();
 156
 157         for (;;) {
 158                 /*
 159                  * "mem=XXX[kKmM]" defines a memory region from
 160                  * 0 to <XXX>, overriding the determined size.
 161                  * "mem=XXX[KkmM]@YYY[KkmM]" defines a memory region from
 162                  * <YYY> to <YYY>+<XXX>, overriding the determined size.
 163                  */
 164                 if (c == ' ' && !memcmp(from, "mem=", 4)) {
 165                         if (to != command_line)
 166                                 to--;
 167                         /*
 168                          * If a user specifies memory size, we
 169                          * blow away any automatically generated
 170                          * size.
 171                          */
 172                         if (usermem == 0) {
 173                                 boot_mem_map.nr_map = 0;
 174                                 usermem = 1;
 175                         }
 176                         mem_size = memparse(from + 4, &from);
 177                         if (*from == '@')
 178                                 start_at = memparse(from + 1, &from);
 179                         else
 180                                 start_at = 0;
 181                         add_memory_region(start_at, mem_size, BOOT_MEM_RAM);
 182                 }
 183                 c = *(from++);
 184                 if (!c)
 185                         break;
 186                 if (CL_SIZE <= ++len)
 187                         break;
 188                 *(to++) = c;
 189         }
 190         *to = '\0';
 191
 192         if (usermem) {
 193                 printk("User-defined physical RAM map:\n");
 194                 print_memory_map();
 195         }
 196 }
 197
 198 static inline int parse_rd_cmdline(unsigned long* rd_start, unsigned long* rd_end)
 199 {
 200         /*
 201          * "rd_start=0xNNNNNNNN" defines the memory address of an initrd
 202          * "rd_size=0xNN" it's size
 203          */
 204         unsigned long start = 0;
 205         unsigned long size = 0;
 206         unsigned long end;
 207         char cmd_line[CL_SIZE];
 208         char *start_str;
 209         char *size_str;
 210         char *tmp;
 211
 212         strcpy(cmd_line, command_line);
 213         *command_line = 0;
 214         tmp = cmd_line;
 215         /* Ignore "rd_start=" strings in other parameters. */
 216         start_str = strstr(cmd_line, "rd_start=");
 217         if (start_str && start_str != cmd_line && *(start_str - 1) != ' ')
 218                 start_str = strstr(start_str, " rd_start=");
 219         while (start_str) {
 220                 if (start_str != cmd_line)
 221                         strncat(command_line, tmp, start_str - tmp);
 222                 start = memparse(start_str + 9, &start_str);
 223                 tmp = start_str + 1;
 224                 start_str = strstr(start_str, " rd_start=");
 225         }
 226         if (*tmp)
 227                 strcat(command_line, tmp);
 228
 229         strcpy(cmd_line, command_line);
 230         *command_line = 0;
 231         tmp = cmd_line;
 232         /* Ignore "rd_size" strings in other parameters. */
 233         size_str = strstr(cmd_line, "rd_size=");
 234         if (size_str && size_str != cmd_line && *(size_str - 1) != ' ')
 235                 size_str = strstr(size_str, " rd_size=");
 236         while (size_str) {
 237                 if (size_str != cmd_line)
 238                         strncat(command_line, tmp, size_str - tmp);
 239                 size = memparse(size_str + 8, &size_str);
 240                 tmp = size_str + 1;
 241                 size_str = strstr(size_str, " rd_size=");
 242         }
 243         if (*tmp)
 244                 strcat(command_line, tmp);
 245
 246 #ifdef CONFIG_64BIT
 247         /* HACK: Guess if the sign extension was forgotten */
 248         if (start > 0x0000000080000000 && start < 0x00000000ffffffff)
 249                 start |= 0xffffffff00000000UL;
 250 #endif
 251
 252         end = start + size;
 253         if (start && end) {
 254                 *rd_start = start;
 255                 *rd_end = end;
 256                 return 1;
 257         }
 258         return 0;
 259 }
 260
 261 #define MAXMEM          HIGHMEM_START
 262 #define MAXMEM_PFN      PFN_DOWN(MAXMEM)
 263
 264 static inline void bootmem_init(void)
 265 {
 266         unsigned long start_pfn;
 267         unsigned long reserved_end = (unsigned long)&_end;
 268 #ifndef CONFIG_SGI_IP27
 269         unsigned long first_usable_pfn;
 270         unsigned long bootmap_size;
 271         int i;
 272 #endif
 273 #ifdef CONFIG_BLK_DEV_INITRD
 274         int initrd_reserve_bootmem = 0;
 275
 276         /* Board specific code should have set up initrd_start and initrd_end */
 277         ROOT_DEV = Root_RAM0;
 278         if (parse_rd_cmdline(&initrd_start, &initrd_end)) {
 279                 reserved_end = max(reserved_end, initrd_end);
 280                 initrd_reserve_bootmem = 1;
 281         } else {
 282                 unsigned long tmp;
 283                 u32 *initrd_header;
 284
 285                 tmp = ((reserved_end + PAGE_SIZE-1) & PAGE_MASK) - sizeof(u32) * 2;
 286                 if (tmp < reserved_end)
 287                         tmp += PAGE_SIZE;
 288                 initrd_header = (u32 *)tmp;
 289                 if (initrd_header[0] == 0x494E5244) {
 290                         initrd_start = (unsigned long)&initrd_header[2];
 291                         initrd_end = initrd_start + initrd_header[1];
 292                         reserved_end = max(reserved_end, initrd_end);
 293                         initrd_reserve_bootmem = 1;
 294                 }
 295         }
 296 #endif  /* CONFIG_BLK_DEV_INITRD */
 297
 298         /*
 299          * Partially used pages are not usable - thus
 300          * we are rounding upwards.
 301          */
 302         start_pfn = PFN_UP(CPHYSADDR(reserved_end));
 303
 304 #ifndef CONFIG_SGI_IP27
 305         /* Find the highest page frame number we have available.  */
 306         max_pfn = 0;
 307         first_usable_pfn = -1UL;
 308         for (i = 0; i < boot_mem_map.nr_map; i++) {
 309                 unsigned long start, end;
 310
 311                 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
 312                         continue;
 313
 314                 start = PFN_UP(boot_mem_map.map[i].addr);
 315                 end = PFN_DOWN(boot_mem_map.map[i].addr
 316                       + boot_mem_map.map[i].size);
 317
 318                 if (start >= end)
 319                         continue;
 320                 if (end > max_pfn)
 321                         max_pfn = end;
 322                 if (start < first_usable_pfn) {
 323                         if (start > start_pfn) {
 324                                 first_usable_pfn = start;
 325                         } else if (end > start_pfn) {
 326                                 first_usable_pfn = start_pfn;
 327                         }
 328                 }
 329         }
 330
 331         /*
 332          * Determine low and high memory ranges
 333          */
 334         max_low_pfn = max_pfn;
 335         if (max_low_pfn > MAXMEM_PFN) {
 336                 max_low_pfn = MAXMEM_PFN;
 337 #ifndef CONFIG_HIGHMEM
 338                 /* Maximum memory usable is what is directly addressable */
 339                 printk(KERN_WARNING "Warning only %ldMB will be used.\n",
 340                        MAXMEM >> 20);
 341                 printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
 342 #endif
 343         }
 344
 345 #ifdef CONFIG_HIGHMEM
 346         /*
 347          * Crude, we really should make a better attempt at detecting
 348          * highstart_pfn
 349          */
 350         highstart_pfn = highend_pfn = max_pfn;
 351         if (max_pfn > MAXMEM_PFN) {
 352                 highstart_pfn = MAXMEM_PFN;
 353                 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
 354                        (highend_pfn - highstart_pfn) >> (20 - PAGE_SHIFT));
 355         }
 356 #endif
 357
 358         /* Initialize the boot-time allocator with low memory only.  */
 359         bootmap_size = init_bootmem(first_usable_pfn, max_low_pfn);
 360
 361         /*
 362          * Register fully available low RAM pages with the bootmem allocator.
 363          */
 364         for (i = 0; i < boot_mem_map.nr_map; i++) {
 365                 unsigned long curr_pfn, last_pfn, size;
 366
 367                 /*
 368                  * Reserve usable memory.
 369                  */
 370                 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
 371                         continue;
 372
 373                 /*
 374                  * We are rounding up the start address of usable memory:
 375                  */
 376                 curr_pfn = PFN_UP(boot_mem_map.map[i].addr);
 377                 if (curr_pfn >= max_low_pfn)
 378                         continue;
 379                 if (curr_pfn < start_pfn)
 380                         curr_pfn = start_pfn;
 381
 382                 /*
 383                  * ... and at the end of the usable range downwards:
 384                  */
 385                 last_pfn = PFN_DOWN(boot_mem_map.map[i].addr
 386                                     + boot_mem_map.map[i].size);
 387
 388                 if (last_pfn > max_low_pfn)
 389                         last_pfn = max_low_pfn;
 390
 391                 /*
 392                  * Only register lowmem part of lowmem segment with bootmem.
 393                  */
 394                 size = last_pfn - curr_pfn;
 395                 if (curr_pfn > PFN_DOWN(HIGHMEM_START))
 396                         continue;
 397                 if (curr_pfn + size - 1 > PFN_DOWN(HIGHMEM_START))
 398                         size = PFN_DOWN(HIGHMEM_START) - curr_pfn;
 399                 if (!size)
 400                         continue;
 401
 402                 /*
 403                  * ... finally, did all the rounding and playing
 404                  * around just make the area go away?
 405                  */
 406                 if (last_pfn <= curr_pfn)
 407                         continue;
 408
 409                 /* Register lowmem ranges */
 410                 free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size));
 411                 memory_present(0, curr_pfn, curr_pfn + size - 1);
 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) -
 422                         ((unsigned char *)initrd_start);
 423                 const int width = sizeof(long) * 2;
 424
 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                                width,
 432                                (unsigned long long) CPHYSADDR(initrd_end),
 433                                width,
 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 /*
 446  * arch_mem_init - initialize memory managment subsystem
 447  *
 448  *  o plat_mem_setup() detects the memory configuration and will record detected
 449  *    memory areas using add_memory_region.
 450  *  o parse_cmdline_early() parses the command line for mem= options which,
 451  *    iff detected, will override the results of the automatic detection.
 452  *
 453  * At this stage the memory configuration of the system is known to the
 454  * kernel but generic memory managment system is still entirely uninitialized.
 455  *
 456  *  o bootmem_init()
 457  *  o sparse_init()
 458  *  o paging_init()
 459  *
 460  * At this stage the bootmem allocator is ready to use.
 461  *
 462  * NOTE: historically plat_mem_setup did the entire platform initialization.
 463  *       This was rather impractical because it meant plat_mem_setup had to
 464  * get away without any kind of memory allocator.  To keep old code from
 465  * breaking plat_setup was just renamed to plat_setup and a second platform
 466  * initialization hook for anything else was introduced.
 467  */
 468
 469 extern void plat_mem_setup(void);
 470
 471 static void __init arch_mem_init(char **cmdline_p)
 472 {
 473         /* call board setup routine */
 474         plat_mem_setup();
 475
 476         strlcpy(command_line, arcs_cmdline, sizeof(command_line));
 477         strlcpy(saved_command_line, command_line, COMMAND_LINE_SIZE);
 478
 479         *cmdline_p = command_line;
 480
 481         parse_cmdline_early();
 482         bootmem_init();
 483         sparse_init();
 484         paging_init();
 485 }
 486
 487 static inline void resource_init(void)
 488 {
 489         int i;
 490
 491         if (UNCAC_BASE != IO_BASE)
 492                 return;
 493
 494         code_resource.start = virt_to_phys(&_text);
 495         code_resource.end = virt_to_phys(&_etext) - 1;
 496         data_resource.start = virt_to_phys(&_etext);
 497         data_resource.end = virt_to_phys(&_edata) - 1;
 498
 499         /*
 500          * Request address space for all standard RAM.
 501          */
 502         for (i = 0; i < boot_mem_map.nr_map; i++) {
 503                 struct resource *res;
 504                 unsigned long start, end;
 505
 506                 start = boot_mem_map.map[i].addr;
 507                 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
 508                 if (start >= MAXMEM)
 509                         continue;
 510                 if (end >= MAXMEM)
 511                         end = MAXMEM - 1;
 512
 513                 res = alloc_bootmem(sizeof(struct resource));
 514                 switch (boot_mem_map.map[i].type) {
 515                 case BOOT_MEM_RAM:
 516                 case BOOT_MEM_ROM_DATA:
 517                         res->name = "System RAM";
 518                         break;
 519                 case BOOT_MEM_RESERVED:
 520                 default:
 521                         res->name = "reserved";
 522                 }
 523
 524                 res->start = start;
 525                 res->end = end;
 526
 527                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 528                 request_resource(&iomem_resource, res);
 529
 530                 /*
 531                  *  We don't know which RAM region contains kernel data,
 532                  *  so we try it repeatedly and let the resource manager
 533                  *  test it.
 534                  */
 535                 request_resource(res, &code_resource);
 536                 request_resource(res, &data_resource);
 537         }
 538 }
 539
 540 #undef MAXMEM
 541 #undef MAXMEM_PFN
 542
 543 void __init setup_arch(char **cmdline_p)
 544 {
 545         cpu_probe();
 546         prom_init();
 547         cpu_report();
 548
 549 #if defined(CONFIG_VT)
 550 #if defined(CONFIG_VGA_CONSOLE)
 551         conswitchp = &vga_con;
 552 #elif defined(CONFIG_DUMMY_CONSOLE)
 553         conswitchp = &dummy_con;
 554 #endif
 555 #endif
 556
 557         arch_mem_init(cmdline_p);
 558
 559         resource_init();
 560 #ifdef CONFIG_SMP
 561         plat_smp_setup();
 562 #endif
 563 }
 564
 565 int __init fpu_disable(char *s)
 566 {
 567         int i;
 568
 569         for (i = 0; i < NR_CPUS; i++)
 570                 cpu_data[i].options &= ~MIPS_CPU_FPU;
 571
 572         return 1;
 573 }
 574
 575 __setup("nofpu", fpu_disable);
 576
 577 int __init dsp_disable(char *s)
 578 {
 579         cpu_data[0].ases &= ~MIPS_ASE_DSP;
 580
 581         return 1;
 582 }
 583
 584 __setup("nodsp", dsp_disable);