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/errno.h>
  14 #include <linux/init.h>
  15 #include <linux/ioport.h>
  16 #include <linux/sched.h>
  17 #include <linux/kernel.h>
  18 #include <linux/mm.h>
  19 #include <linux/module.h>
  20 #include <linux/stddef.h>
  21 #include <linux/string.h>
  22 #include <linux/unistd.h>
  23 #include <linux/slab.h>
  24 #include <linux/user.h>
  25 #include <linux/utsname.h>
  26 #include <linux/a.out.h>
  27 #include <linux/screen_info.h>
  28 #include <linux/bootmem.h>
  29 #include <linux/initrd.h>
  30 #include <linux/major.h>
  31 #include <linux/kdev_t.h>
  32 #include <linux/root_dev.h>
  33 #include <linux/highmem.h>
  34 #include <linux/console.h>
  35 #include <linux/mmzone.h>
  36 #include <linux/pfn.h>
  37
  38 #include <asm/addrspace.h>
  39 #include <asm/bootinfo.h>
  40 #include <asm/cache.h>
  41 #include <asm/cpu.h>
  42 #include <asm/sections.h>
  43 #include <asm/setup.h>
  44 #include <asm/system.h>
  45
  46 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
  47
  48 EXPORT_SYMBOL(cpu_data);
  49
  50 #ifdef CONFIG_VT
  51 struct screen_info screen_info;
  52 #endif
  53
  54 /*
  55  * Despite it's name this variable is even if we don't have PCI
  56  */
  57 unsigned int PCI_DMA_BUS_IS_PHYS;
  58
  59 EXPORT_SYMBOL(PCI_DMA_BUS_IS_PHYS);
  60
  61 /*
  62  * Setup information
  63  *
  64  * These are initialized so they are in the .data section
  65  */
  66 unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
  67 unsigned long mips_machgroup __read_mostly = MACH_GROUP_UNKNOWN;
  68
  69 EXPORT_SYMBOL(mips_machtype);
  70 EXPORT_SYMBOL(mips_machgroup);
  71
  72 struct boot_mem_map boot_mem_map;
  73
  74 static char command_line[CL_SIZE];
  75        char arcs_cmdline[CL_SIZE]=CONFIG_CMDLINE;
  76
  77 /*
  78  * mips_io_port_base is the begin of the address space to which x86 style
  79  * I/O ports are mapped.
  80  */
  81 const unsigned long mips_io_port_base __read_mostly = -1;
  82 EXPORT_SYMBOL(mips_io_port_base);
  83
  84 /*
  85  * isa_slot_offset is the address where E(ISA) busaddress 0 is mapped
  86  * for the processor.
  87  */
  88 unsigned long isa_slot_offset;
  89 EXPORT_SYMBOL(isa_slot_offset);
  90
  91 static struct resource code_resource = { .name = "Kernel code", };
  92 static struct resource data_resource = { .name = "Kernel data", };
  93
  94 void __init add_memory_region(phys_t start, phys_t size, long type)
  95 {
  96         int x = boot_mem_map.nr_map;
  97         struct boot_mem_map_entry *prev = boot_mem_map.map + x - 1;
  98
  99         /*
 100          * Try to merge with previous entry if any.  This is far less than
 101          * perfect but is sufficient for most real world cases.
 102          */
 103         if (x && prev->addr + prev->size == start && prev->type == type) {
 104                 prev->size += size;
 105                 return;
 106         }
 107
 108         if (x == BOOT_MEM_MAP_MAX) {
 109                 printk("Ooops! Too many entries in the memory map!\n");
 110                 return;
 111         }
 112
 113         boot_mem_map.map[x].addr = start;
 114         boot_mem_map.map[x].size = size;
 115         boot_mem_map.map[x].type = type;
 116         boot_mem_map.nr_map++;
 117 }
 118
 119 static void __init print_memory_map(void)
 120 {
 121         int i;
 122         const int field = 2 * sizeof(unsigned long);
 123
 124         for (i = 0; i < boot_mem_map.nr_map; i++) {
 125                 printk(" memory: %0*Lx @ %0*Lx ",
 126                        field, (unsigned long long) boot_mem_map.map[i].size,
 127                        field, (unsigned long long) boot_mem_map.map[i].addr);
 128
 129                 switch (boot_mem_map.map[i].type) {
 130                 case BOOT_MEM_RAM:
 131                         printk("(usable)\n");
 132                         break;
 133                 case BOOT_MEM_ROM_DATA:
 134                         printk("(ROM data)\n");
 135                         break;
 136                 case BOOT_MEM_RESERVED:
 137                         printk("(reserved)\n");
 138                         break;
 139                 default:
 140                         printk("type %lu\n", boot_mem_map.map[i].type);
 141                         break;
 142                 }
 143         }
 144 }
 145
 146 static inline void parse_cmdline_early(void)
 147 {
 148         char c = ' ', *to = command_line, *from = saved_command_line;
 149         unsigned long start_at, mem_size;
 150         int len = 0;
 151         int usermem = 0;
 152
 153         printk("Determined physical RAM map:\n");
 154         print_memory_map();
 155
 156         for (;;) {
 157                 /*
 158                  * "mem=XXX[kKmM]" defines a memory region from
 159                  * 0 to <XXX>, overriding the determined size.
 160                  * "mem=XXX[KkmM]@YYY[KkmM]" defines a memory region from
 161                  * <YYY> to <YYY>+<XXX>, overriding the determined size.
 162                  */
 163                 if (c == ' ' && !memcmp(from, "mem=", 4)) {
 164                         if (to != command_line)
 165                                 to--;
 166                         /*
 167                          * If a user specifies memory size, we
 168                          * blow away any automatically generated
 169                          * size.
 170                          */
 171                         if (usermem == 0) {
 172                                 boot_mem_map.nr_map = 0;
 173                                 usermem = 1;
 174                         }
 175                         mem_size = memparse(from + 4, &from);
 176                         if (*from == '@')
 177                                 start_at = memparse(from + 1, &from);
 178                         else
 179                                 start_at = 0;
 180                         add_memory_region(start_at, mem_size, BOOT_MEM_RAM);
 181                 }
 182                 c = *(from++);
 183                 if (!c)
 184                         break;
 185                 if (CL_SIZE <= ++len)
 186                         break;
 187                 *(to++) = c;
 188         }
 189         *to = '\0';
 190
 191         if (usermem) {
 192                 printk("User-defined physical RAM map:\n");
 193                 print_memory_map();
 194         }
 195 }
 196
 197 static inline int parse_rd_cmdline(unsigned long* rd_start, unsigned long* rd_end)
 198 {
 199         /*
 200          * "rd_start=0xNNNNNNNN" defines the memory address of an initrd
 201          * "rd_size=0xNN" it's size
 202          */
 203         unsigned long start = 0;
 204         unsigned long size = 0;
 205         unsigned long end;
 206         char cmd_line[CL_SIZE];
 207         char *start_str;
 208         char *size_str;
 209         char *tmp;
 210
 211         strcpy(cmd_line, command_line);
 212         *command_line = 0;
 213         tmp = cmd_line;
 214         /* Ignore "rd_start=" strings in other parameters. */
 215         start_str = strstr(cmd_line, "rd_start=");
 216         if (start_str && start_str != cmd_line && *(start_str - 1) != ' ')
 217                 start_str = strstr(start_str, " rd_start=");
 218         while (start_str) {
 219                 if (start_str != cmd_line)
 220                         strncat(command_line, tmp, start_str - tmp);
 221                 start = memparse(start_str + 9, &start_str);
 222                 tmp = start_str + 1;
 223                 start_str = strstr(start_str, " rd_start=");
 224         }
 225         if (*tmp)
 226                 strcat(command_line, tmp);
 227
 228         strcpy(cmd_line, command_line);
 229         *command_line = 0;
 230         tmp = cmd_line;
 231         /* Ignore "rd_size" strings in other parameters. */
 232         size_str = strstr(cmd_line, "rd_size=");
 233         if (size_str && size_str != cmd_line && *(size_str - 1) != ' ')
 234                 size_str = strstr(size_str, " rd_size=");
 235         while (size_str) {
 236                 if (size_str != cmd_line)
 237                         strncat(command_line, tmp, size_str - tmp);
 238                 size = memparse(size_str + 8, &size_str);
 239                 tmp = size_str + 1;
 240                 size_str = strstr(size_str, " rd_size=");
 241         }
 242         if (*tmp)
 243                 strcat(command_line, tmp);
 244
 245 #ifdef CONFIG_64BIT
 246         /* HACK: Guess if the sign extension was forgotten */
 247         if (start > 0x0000000080000000 && start < 0x00000000ffffffff)
 248                 start |= 0xffffffff00000000UL;
 249 #endif
 250
 251         end = start + size;
 252         if (start && end) {
 253                 *rd_start = start;
 254                 *rd_end = end;
 255                 return 1;
 256         }
 257         return 0;
 258 }
 259
 260 #define MAXMEM          HIGHMEM_START
 261 #define MAXMEM_PFN      PFN_DOWN(MAXMEM)
 262
 263 static inline void bootmem_init(void)
 264 {
 265         unsigned long start_pfn;
 266         unsigned long reserved_end = (unsigned long)&_end;
 267 #ifndef CONFIG_SGI_IP27
 268         unsigned long first_usable_pfn;
 269         unsigned long bootmap_size;
 270         int i;
 271 #endif
 272 #ifdef CONFIG_BLK_DEV_INITRD
 273         int initrd_reserve_bootmem = 0;
 274
 275         /* Board specific code should have set up initrd_start and initrd_end */
 276         ROOT_DEV = Root_RAM0;
 277         if (parse_rd_cmdline(&initrd_start, &initrd_end)) {
 278                 reserved_end = max(reserved_end, initrd_end);
 279                 initrd_reserve_bootmem = 1;
 280         } else {
 281                 unsigned long tmp;
 282                 u32 *initrd_header;
 283
 284                 tmp = ((reserved_end + PAGE_SIZE-1) & PAGE_MASK) - sizeof(u32) * 2;
 285                 if (tmp < reserved_end)
 286                         tmp += PAGE_SIZE;
 287                 initrd_header = (u32 *)tmp;
 288                 if (initrd_header[0] == 0x494E5244) {
 289                         initrd_start = (unsigned long)&initrd_header[2];
 290                         initrd_end = initrd_start + initrd_header[1];
 291                         reserved_end = max(reserved_end, initrd_end);
 292                         initrd_reserve_bootmem = 1;
 293                 }
 294         }
 295 #endif  /* CONFIG_BLK_DEV_INITRD */
 296
 297         /*
 298          * Partially used pages are not usable - thus
 299          * we are rounding upwards.
 300          */
 301         start_pfn = PFN_UP(CPHYSADDR(reserved_end));
 302
 303 #ifndef CONFIG_SGI_IP27
 304         /* Find the highest page frame number we have available.  */
 305         max_pfn = 0;
 306         first_usable_pfn = -1UL;
 307         for (i = 0; i < boot_mem_map.nr_map; i++) {
 308                 unsigned long start, end;
 309
 310                 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
 311                         continue;
 312
 313                 start = PFN_UP(boot_mem_map.map[i].addr);
 314                 end = PFN_DOWN(boot_mem_map.map[i].addr
 315                       + boot_mem_map.map[i].size);
 316
 317                 if (start >= end)
 318                         continue;
 319                 if (end > max_pfn)
 320                         max_pfn = end;
 321                 if (start < first_usable_pfn) {
 322                         if (start > start_pfn) {
 323                                 first_usable_pfn = start;
 324                         } else if (end > start_pfn) {
 325                                 first_usable_pfn = start_pfn;
 326                         }
 327                 }
 328         }
 329
 330         /*
 331          * Determine low and high memory ranges
 332          */
 333         max_low_pfn = max_pfn;
 334         if (max_low_pfn > MAXMEM_PFN) {
 335                 max_low_pfn = MAXMEM_PFN;
 336 #ifndef CONFIG_HIGHMEM
 337                 /* Maximum memory usable is what is directly addressable */
 338                 printk(KERN_WARNING "Warning only %ldMB will be used.\n",
 339                        MAXMEM >> 20);
 340                 printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
 341 #endif
 342         }
 343
 344 #ifdef CONFIG_HIGHMEM
 345         /*
 346          * Crude, we really should make a better attempt at detecting
 347          * highstart_pfn
 348          */
 349         highstart_pfn = highend_pfn = max_pfn;
 350         if (max_pfn > MAXMEM_PFN) {
 351                 highstart_pfn = MAXMEM_PFN;
 352                 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
 353                        (highend_pfn - highstart_pfn) >> (20 - PAGE_SHIFT));
 354         }
 355 #endif
 356
 357         /* Initialize the boot-time allocator with low memory only.  */
 358         bootmap_size = init_bootmem(first_usable_pfn, max_low_pfn);
 359
 360         /*
 361          * Register fully available low RAM pages with the bootmem allocator.
 362          */
 363         for (i = 0; i < boot_mem_map.nr_map; i++) {
 364                 unsigned long curr_pfn, last_pfn, size;
 365
 366                 /*
 367                  * Reserve usable memory.
 368                  */
 369                 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
 370                         continue;
 371
 372                 /*
 373                  * We are rounding up the start address of usable memory:
 374                  */
 375                 curr_pfn = PFN_UP(boot_mem_map.map[i].addr);
 376                 if (curr_pfn >= max_low_pfn)
 377                         continue;
 378                 if (curr_pfn < start_pfn)
 379                         curr_pfn = start_pfn;
 380
 381                 /*
 382                  * ... and at the end of the usable range downwards:
 383                  */
 384                 last_pfn = PFN_DOWN(boot_mem_map.map[i].addr
 385                                     + boot_mem_map.map[i].size);
 386
 387                 if (last_pfn > max_low_pfn)
 388                         last_pfn = max_low_pfn;
 389
 390                 /*
 391                  * Only register lowmem part of lowmem segment with bootmem.
 392                  */
 393                 size = last_pfn - curr_pfn;
 394                 if (curr_pfn > PFN_DOWN(HIGHMEM_START))
 395                         continue;
 396                 if (curr_pfn + size - 1 > PFN_DOWN(HIGHMEM_START))
 397                         size = PFN_DOWN(HIGHMEM_START) - curr_pfn;
 398                 if (!size)
 399                         continue;
 400
 401                 /*
 402                  * ... finally, did all the rounding and playing
 403                  * around just make the area go away?
 404                  */
 405                 if (last_pfn <= curr_pfn)
 406                         continue;
 407
 408                 /* Register lowmem ranges */
 409                 free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size));
 410                 memory_present(0, curr_pfn, curr_pfn + size - 1);
 411         }
 412
 413         /* Reserve the bootmap memory.  */
 414         reserve_bootmem(PFN_PHYS(first_usable_pfn), bootmap_size);
 415 #endif /* CONFIG_SGI_IP27 */
 416
 417 #ifdef CONFIG_BLK_DEV_INITRD
 418         initrd_below_start_ok = 1;
 419         if (initrd_start) {
 420                 unsigned long initrd_size = ((unsigned char *)initrd_end) -
 421                         ((unsigned char *)initrd_start);
 422                 const int width = sizeof(long) * 2;
 423
 424                 printk("Initial ramdisk at: 0x%p (%lu bytes)\n",
 425                        (void *)initrd_start, initrd_size);
 426
 427                 if (CPHYSADDR(initrd_end) > PFN_PHYS(max_low_pfn)) {
 428                         printk("initrd extends beyond end of memory "
 429                                "(0x%0*Lx > 0x%0*Lx)\ndisabling initrd\n",
 430                                width,
 431                                (unsigned long long) CPHYSADDR(initrd_end),
 432                                width,
 433                                (unsigned long long) PFN_PHYS(max_low_pfn));
 434                         initrd_start = initrd_end = 0;
 435                         initrd_reserve_bootmem = 0;
 436                 }
 437
 438                 if (initrd_reserve_bootmem)
 439                         reserve_bootmem(CPHYSADDR(initrd_start), initrd_size);
 440         }
 441 #endif /* CONFIG_BLK_DEV_INITRD  */
 442 }
 443
 444 /*
 445  * arch_mem_init - initialize memory managment subsystem
 446  *
 447  *  o plat_mem_setup() detects the memory configuration and will record detected
 448  *    memory areas using add_memory_region.
 449  *  o parse_cmdline_early() parses the command line for mem= options which,
 450  *    iff detected, will override the results of the automatic detection.
 451  *
 452  * At this stage the memory configuration of the system is known to the
 453  * kernel but generic memory managment system is still entirely uninitialized.
 454  *
 455  *  o bootmem_init()
 456  *  o sparse_init()
 457  *  o paging_init()
 458  *
 459  * At this stage the bootmem allocator is ready to use.
 460  *
 461  * NOTE: historically plat_mem_setup did the entire platform initialization.
 462  *       This was rather impractical because it meant plat_mem_setup had to
 463  * get away without any kind of memory allocator.  To keep old code from
 464  * breaking plat_setup was just renamed to plat_setup and a second platform
 465  * initialization hook for anything else was introduced.
 466  */
 467
 468 extern void plat_mem_setup(void);
 469
 470 static void __init arch_mem_init(char **cmdline_p)
 471 {
 472         /* call board setup routine */
 473         plat_mem_setup();
 474
 475         strlcpy(command_line, arcs_cmdline, sizeof(command_line));
 476         strlcpy(saved_command_line, command_line, COMMAND_LINE_SIZE);
 477
 478         *cmdline_p = command_line;
 479
 480         parse_cmdline_early();
 481         bootmem_init();
 482         sparse_init();
 483         paging_init();
 484 }
 485
 486 static inline void resource_init(void)
 487 {
 488         int i;
 489
 490         if (UNCAC_BASE != IO_BASE)
 491                 return;
 492
 493         code_resource.start = virt_to_phys(&_text);
 494         code_resource.end = virt_to_phys(&_etext) - 1;
 495         data_resource.start = virt_to_phys(&_etext);
 496         data_resource.end = virt_to_phys(&_edata) - 1;
 497
 498         /*
 499          * Request address space for all standard RAM.
 500          */
 501         for (i = 0; i < boot_mem_map.nr_map; i++) {
 502                 struct resource *res;
 503                 unsigned long start, end;
 504
 505                 start = boot_mem_map.map[i].addr;
 506                 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
 507                 if (start >= MAXMEM)
 508                         continue;
 509                 if (end >= MAXMEM)
 510                         end = MAXMEM - 1;
 511
 512                 res = alloc_bootmem(sizeof(struct resource));
 513                 switch (boot_mem_map.map[i].type) {
 514                 case BOOT_MEM_RAM:
 515                 case BOOT_MEM_ROM_DATA:
 516                         res->name = "System RAM";
 517                         break;
 518                 case BOOT_MEM_RESERVED:
 519                 default:
 520                         res->name = "reserved";
 521                 }
 522
 523                 res->start = start;
 524                 res->end = end;
 525
 526                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 527                 request_resource(&iomem_resource, res);
 528
 529                 /*
 530                  *  We don't know which RAM region contains kernel data,
 531                  *  so we try it repeatedly and let the resource manager
 532                  *  test it.
 533                  */
 534                 request_resource(res, &code_resource);
 535                 request_resource(res, &data_resource);
 536         }
 537 }
 538
 539 #undef MAXMEM
 540 #undef MAXMEM_PFN
 541
 542 void __init setup_arch(char **cmdline_p)
 543 {
 544         cpu_probe();
 545         prom_init();
 546         cpu_report();
 547
 548 #if defined(CONFIG_VT)
 549 #if defined(CONFIG_VGA_CONSOLE)
 550         conswitchp = &vga_con;
 551 #elif defined(CONFIG_DUMMY_CONSOLE)
 552         conswitchp = &dummy_con;
 553 #endif
 554 #endif
 555
 556         arch_mem_init(cmdline_p);
 557
 558         resource_init();
 559 #ifdef CONFIG_SMP
 560         plat_smp_setup();
 561 #endif
 562 }
 563
 564 int __init fpu_disable(char *s)
 565 {
 566         int i;
 567
 568         for (i = 0; i < NR_CPUS; i++)
 569                 cpu_data[i].options &= ~MIPS_CPU_FPU;
 570
 571         return 1;
 572 }
 573
 574 __setup("nofpu", fpu_disable);
 575
 576 int __init dsp_disable(char *s)
 577 {
 578         cpu_data[0].ases &= ~MIPS_ASE_DSP;
 579
 580         return 1;
 581 }
 582
 583 __setup("nodsp", dsp_disable);