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/system.h>
  42
  43 struct cpuinfo_mips cpu_data[NR_CPUS];
  44
  45 EXPORT_SYMBOL(cpu_data);
  46
  47 #ifdef CONFIG_VT
  48 struct screen_info screen_info;
  49 #endif
  50
  51 /*
  52  * Despite it's name this variable is even if we don't have PCI
  53  */
  54 unsigned int PCI_DMA_BUS_IS_PHYS;
  55
  56 EXPORT_SYMBOL(PCI_DMA_BUS_IS_PHYS);
  57
  58 extern void * __rd_start, * __rd_end;
  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 saved_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 = -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 = { "Kernel code" };
  92 static struct resource data_resource = { "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
 198 #define PFN_UP(x)       (((x) + PAGE_SIZE - 1) >> PAGE_SHIFT)
 199 #define PFN_DOWN(x)     ((x) >> PAGE_SHIFT)
 200 #define PFN_PHYS(x)     ((x) << PAGE_SHIFT)
 201
 202 #define MAXMEM          HIGHMEM_START
 203 #define MAXMEM_PFN      PFN_DOWN(MAXMEM)
 204
 205 static inline void bootmem_init(void)
 206 {
 207         unsigned long start_pfn;
 208 #ifndef CONFIG_SGI_IP27
 209         unsigned long bootmap_size, max_low_pfn, first_usable_pfn;
 210         int i;
 211 #endif
 212 #ifdef CONFIG_BLK_DEV_INITRD
 213         unsigned long tmp;
 214         unsigned long *initrd_header;
 215
 216         tmp = (((unsigned long)&_end + PAGE_SIZE-1) & PAGE_MASK) - 8;
 217         if (tmp < (unsigned long)&_end)
 218                 tmp += PAGE_SIZE;
 219         initrd_header = (unsigned long *)tmp;
 220         if (initrd_header[0] == 0x494E5244) {
 221                 initrd_start = (unsigned long)&initrd_header[2];
 222                 initrd_end = initrd_start + initrd_header[1];
 223         }
 224         start_pfn = PFN_UP(CPHYSADDR((&_end)+(initrd_end - initrd_start) + PAGE_SIZE));
 225 #else
 226         /*
 227          * Partially used pages are not usable - thus
 228          * we are rounding upwards.
 229          */
 230         start_pfn = PFN_UP(CPHYSADDR(&_end));
 231 #endif  /* CONFIG_BLK_DEV_INITRD */
 232
 233 #ifndef CONFIG_SGI_IP27
 234         /* Find the highest page frame number we have available.  */
 235         max_pfn = 0;
 236         first_usable_pfn = -1UL;
 237         for (i = 0; i < boot_mem_map.nr_map; i++) {
 238                 unsigned long start, end;
 239
 240                 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
 241                         continue;
 242
 243                 start = PFN_UP(boot_mem_map.map[i].addr);
 244                 end = PFN_DOWN(boot_mem_map.map[i].addr
 245                       + boot_mem_map.map[i].size);
 246
 247                 if (start >= end)
 248                         continue;
 249                 if (end > max_pfn)
 250                         max_pfn = end;
 251                 if (start < first_usable_pfn) {
 252                         if (start > start_pfn) {
 253                                 first_usable_pfn = start;
 254                         } else if (end > start_pfn) {
 255                                 first_usable_pfn = start_pfn;
 256                         }
 257                 }
 258         }
 259
 260         /*
 261          * Determine low and high memory ranges
 262          */
 263         max_low_pfn = max_pfn;
 264         if (max_low_pfn > MAXMEM_PFN) {
 265                 max_low_pfn = MAXMEM_PFN;
 266 #ifndef CONFIG_HIGHMEM
 267                 /* Maximum memory usable is what is directly addressable */
 268                 printk(KERN_WARNING "Warning only %ldMB will be used.\n",
 269                        MAXMEM >> 20);
 270                 printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
 271 #endif
 272         }
 273
 274 #ifdef CONFIG_HIGHMEM
 275         /*
 276          * Crude, we really should make a better attempt at detecting
 277          * highstart_pfn
 278          */
 279         highstart_pfn = highend_pfn = max_pfn;
 280         if (max_pfn > MAXMEM_PFN) {
 281                 highstart_pfn = MAXMEM_PFN;
 282                 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
 283                        (highend_pfn - highstart_pfn) >> (20 - PAGE_SHIFT));
 284         }
 285 #endif
 286
 287         /* Initialize the boot-time allocator with low memory only.  */
 288         bootmap_size = init_bootmem(first_usable_pfn, max_low_pfn);
 289
 290         /*
 291          * Register fully available low RAM pages with the bootmem allocator.
 292          */
 293         for (i = 0; i < boot_mem_map.nr_map; i++) {
 294                 unsigned long curr_pfn, last_pfn, size;
 295
 296                 /*
 297                  * Reserve usable memory.
 298                  */
 299                 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
 300                         continue;
 301
 302                 /*
 303                  * We are rounding up the start address of usable memory:
 304                  */
 305                 curr_pfn = PFN_UP(boot_mem_map.map[i].addr);
 306                 if (curr_pfn >= max_low_pfn)
 307                         continue;
 308                 if (curr_pfn < start_pfn)
 309                         curr_pfn = start_pfn;
 310
 311                 /*
 312                  * ... and at the end of the usable range downwards:
 313                  */
 314                 last_pfn = PFN_DOWN(boot_mem_map.map[i].addr
 315                                     + boot_mem_map.map[i].size);
 316
 317                 if (last_pfn > max_low_pfn)
 318                         last_pfn = max_low_pfn;
 319
 320                 /*
 321                  * Only register lowmem part of lowmem segment with bootmem.
 322                  */
 323                 size = last_pfn - curr_pfn;
 324                 if (curr_pfn > PFN_DOWN(HIGHMEM_START))
 325                         continue;
 326                 if (curr_pfn + size - 1 > PFN_DOWN(HIGHMEM_START))
 327                         size = PFN_DOWN(HIGHMEM_START) - curr_pfn;
 328                 if (!size)
 329                         continue;
 330
 331                 /*
 332                  * ... finally, did all the rounding and playing
 333                  * around just make the area go away?
 334                  */
 335                 if (last_pfn <= curr_pfn)
 336                         continue;
 337
 338                 /* Register lowmem ranges */
 339                 free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size));
 340         }
 341
 342         /* Reserve the bootmap memory.  */
 343         reserve_bootmem(PFN_PHYS(first_usable_pfn), bootmap_size);
 344 #endif
 345
 346 #ifdef CONFIG_BLK_DEV_INITRD
 347         /* Board specific code should have set up initrd_start and initrd_end */
 348         ROOT_DEV = Root_RAM0;
 349         if (&__rd_start != &__rd_end) {
 350                 initrd_start = (unsigned long)&__rd_start;
 351                 initrd_end = (unsigned long)&__rd_end;
 352         }
 353         initrd_below_start_ok = 1;
 354         if (initrd_start) {
 355                 unsigned long initrd_size = ((unsigned char *)initrd_end) - ((unsigned char *)initrd_start);
 356                 printk("Initial ramdisk at: 0x%p (%lu bytes)\n",
 357                        (void *)initrd_start,
 358                        initrd_size);
 359
 360                 if (CPHYSADDR(initrd_end) > PFN_PHYS(max_low_pfn)) {
 361                         printk("initrd extends beyond end of memory "
 362                                "(0x%0*Lx > 0x%0*Lx)\ndisabling initrd\n",
 363                                sizeof(long) * 2, CPHYSADDR(initrd_end),
 364                                sizeof(long) * 2, PFN_PHYS(max_low_pfn));
 365                         initrd_start = initrd_end = 0;
 366                 }
 367         }
 368 #endif /* CONFIG_BLK_DEV_INITRD  */
 369 }
 370
 371 static inline void resource_init(void)
 372 {
 373         int i;
 374
 375         code_resource.start = virt_to_phys(&_text);
 376         code_resource.end = virt_to_phys(&_etext) - 1;
 377         data_resource.start = virt_to_phys(&_etext);
 378         data_resource.end = virt_to_phys(&_edata) - 1;
 379
 380         /*
 381          * Request address space for all standard RAM.
 382          */
 383         for (i = 0; i < boot_mem_map.nr_map; i++) {
 384                 struct resource *res;
 385                 unsigned long start, end;
 386
 387                 start = boot_mem_map.map[i].addr;
 388                 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
 389                 if (start >= MAXMEM)
 390                         continue;
 391                 if (end >= MAXMEM)
 392                         end = MAXMEM - 1;
 393
 394                 res = alloc_bootmem(sizeof(struct resource));
 395                 switch (boot_mem_map.map[i].type) {
 396                 case BOOT_MEM_RAM:
 397                 case BOOT_MEM_ROM_DATA:
 398                         res->name = "System RAM";
 399                         break;
 400                 case BOOT_MEM_RESERVED:
 401                 default:
 402                         res->name = "reserved";
 403                 }
 404
 405                 res->start = start;
 406                 res->end = end;
 407
 408                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 409                 request_resource(&iomem_resource, res);
 410
 411                 /*
 412                  *  We don't know which RAM region contains kernel data,
 413                  *  so we try it repeatedly and let the resource manager
 414                  *  test it.
 415                  */
 416                 request_resource(res, &code_resource);
 417                 request_resource(res, &data_resource);
 418         }
 419 }
 420
 421 #undef PFN_UP
 422 #undef PFN_DOWN
 423 #undef PFN_PHYS
 424
 425 #undef MAXMEM
 426 #undef MAXMEM_PFN
 427
 428 static int __initdata earlyinit_debug;
 429
 430 static int __init earlyinit_debug_setup(char *str)
 431 {
 432         earlyinit_debug = 1;
 433         return 1;
 434 }
 435 __setup("earlyinit_debug", earlyinit_debug_setup);
 436
 437 extern initcall_t __earlyinitcall_start, __earlyinitcall_end;
 438
 439 static void __init do_earlyinitcalls(void)
 440 {
 441         initcall_t *call, *start, *end;
 442
 443         start = &__earlyinitcall_start;
 444         end = &__earlyinitcall_end;
 445
 446         for (call = start; call < end; call++) {
 447                 if (earlyinit_debug)
 448                         printk("calling earlyinitcall 0x%p\n", *call);
 449
 450                 (*call)();
 451         }
 452 }
 453
 454 void __init setup_arch(char **cmdline_p)
 455 {
 456         cpu_probe();
 457         prom_init();
 458         cpu_report();
 459
 460 #ifdef CONFIG_MIPS32
 461         /* Disable coprocessors and set FPU for 16/32 FPR register model */
 462         clear_c0_status(ST0_CU1|ST0_CU2|ST0_CU3|ST0_KX|ST0_SX|ST0_FR);
 463         set_c0_status(ST0_CU0);
 464 #endif
 465 #ifdef CONFIG_MIPS64
 466         /*
 467          * On IP27, I am seeing the TS bit set when the kernel is loaded.
 468          * Maybe because the kernel is in ckseg0 and not xkphys? Clear it
 469          * anyway ...
 470          */
 471         clear_c0_status(ST0_BEV|ST0_TS|ST0_CU1|ST0_CU2|ST0_CU3);
 472         set_c0_status(ST0_CU0|ST0_KX|ST0_SX|ST0_FR);
 473 #endif
 474
 475 #if defined(CONFIG_VT)
 476 #if defined(CONFIG_VGA_CONSOLE)
 477         conswitchp = &vga_con;
 478 #elif defined(CONFIG_DUMMY_CONSOLE)
 479         conswitchp = &dummy_con;
 480 #endif
 481 #endif
 482
 483         /* call board setup routine */
 484         do_earlyinitcalls();
 485
 486         strlcpy(command_line, arcs_cmdline, sizeof(command_line));
 487         strlcpy(saved_command_line, command_line, sizeof(saved_command_line));
 488
 489         *cmdline_p = command_line;
 490
 491         parse_cmdline_early();
 492         bootmem_init();
 493         paging_init();
 494         resource_init();
 495 }
 496
 497 int __init fpu_disable(char *s)
 498 {
 499         cpu_data[0].options &= ~MIPS_CPU_FPU;
 500
 501         return 1;
 502 }
 503
 504 __setup("nofpu", fpu_disable);