kernel/linux/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 extern void * __rd_start, * __rd_end;
  60
  61 /*
  62  * Setup information
  63  *
  64  * These are initialized so they are in the .data section
  65  */
  66 unsigned long mips_machtype = MACH_UNKNOWN;
  67 unsigned long mips_machgroup = 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
  82 const unsigned long mips_io_port_base = KSEG1;
  83
  84 EXPORT_SYMBOL(mips_io_port_base);
  85
  86 /*
  87  * isa_slot_offset is the address where E(ISA) busaddress 0 is mapped
  88  * for the processor.
  89  */
  90 unsigned long isa_slot_offset;
  91 EXPORT_SYMBOL(isa_slot_offset);
  92
  93 static struct resource code_resource = { "Kernel code" };
  94 static struct resource data_resource = { "Kernel data" };
  95
  96 void __init add_memory_region(phys_t start, phys_t size, long type)
  97 {
  98         int x = boot_mem_map.nr_map;
  99         struct boot_mem_map_entry *prev = boot_mem_map.map + x - 1;
 100
 101         /*
 102          * Try to merge with previous entry if any.  This is far less than
 103          * perfect but is sufficient for most real world cases.
 104          */
 105         if (x && prev->addr + prev->size == start && prev->type == type) {
 106                 prev->size += size;
 107                 return;
 108         }
 109
 110         if (x == BOOT_MEM_MAP_MAX) {
 111                 printk("Ooops! Too many entries in the memory map!\n");
 112                 return;
 113         }
 114
 115         boot_mem_map.map[x].addr = start;
 116         boot_mem_map.map[x].size = size;
 117         boot_mem_map.map[x].type = type;
 118         boot_mem_map.nr_map++;
 119 }
 120
 121 static void __init print_memory_map(void)
 122 {
 123         int i;
 124         const int field = 2 * sizeof(unsigned long);
 125
 126         for (i = 0; i < boot_mem_map.nr_map; i++) {
 127                 printk(" memory: %0*Lx @ %0*Lx ",
 128                        field, (unsigned long long) boot_mem_map.map[i].size,
 129                        field, (unsigned long long) boot_mem_map.map[i].addr);
 130
 131                 switch (boot_mem_map.map[i].type) {
 132                 case BOOT_MEM_RAM:
 133                         printk("(usable)\n");
 134                         break;
 135                 case BOOT_MEM_ROM_DATA:
 136                         printk("(ROM data)\n");
 137                         break;
 138                 case BOOT_MEM_RESERVED:
 139                         printk("(reserved)\n");
 140                         break;
 141                 default:
 142                         printk("type %lu\n", boot_mem_map.map[i].type);
 143                         break;
 144                 }
 145         }
 146 }
 147
 148 static inline void parse_cmdline_early(void)
 149 {
 150         char c = ' ', *to = command_line, *from = saved_command_line;
 151         unsigned long start_at, mem_size;
 152         int len = 0;
 153         int usermem = 0;
 154
 155         printk("Determined physical RAM map:\n");
 156         print_memory_map();
 157
 158         for (;;) {
 159                 /*
 160                  * "mem=XXX[kKmM]" defines a memory region from
 161                  * 0 to <XXX>, overriding the determined size.
 162                  * "mem=XXX[KkmM]@YYY[KkmM]" defines a memory region from
 163                  * <YYY> to <YYY>+<XXX>, overriding the determined size.
 164                  */
 165                 if (c == ' ' && !memcmp(from, "mem=", 4)) {
 166                         if (to != command_line)
 167                                 to--;
 168                         /*
 169                          * If a user specifies memory size, we
 170                          * blow away any automatically generated
 171                          * size.
 172                          */
 173                         if (usermem == 0) {
 174                                 boot_mem_map.nr_map = 0;
 175                                 usermem = 1;
 176                         }
 177                         mem_size = memparse(from + 4, &from);
 178                         if (*from == '@')
 179                                 start_at = memparse(from + 1, &from);
 180                         else
 181                                 start_at = 0;
 182                         add_memory_region(start_at, mem_size, BOOT_MEM_RAM);
 183                 }
 184                 c = *(from++);
 185                 if (!c)
 186                         break;
 187                 if (CL_SIZE <= ++len)
 188                         break;
 189                 *(to++) = c;
 190         }
 191         *to = '\0';
 192
 193         if (usermem) {
 194                 printk("User-defined physical RAM map:\n");
 195                 print_memory_map();
 196         }
 197 }
 198
 199
 200 #define PFN_UP(x)       (((x) + PAGE_SIZE - 1) >> PAGE_SHIFT)
 201 #define PFN_DOWN(x)     ((x) >> PAGE_SHIFT)
 202 #define PFN_PHYS(x)     ((x) << PAGE_SHIFT)
 203
 204 #define MAXMEM          HIGHMEM_START
 205 #define MAXMEM_PFN      PFN_DOWN(MAXMEM)
 206
 207 static inline void bootmem_init(void)
 208 {
 209         unsigned long start_pfn;
 210 #ifndef CONFIG_SGI_IP27
 211         unsigned long bootmap_size, max_low_pfn, first_usable_pfn;
 212         int i;
 213 #endif
 214 #ifdef CONFIG_BLK_DEV_INITRD
 215         unsigned long tmp;
 216         unsigned long *initrd_header;
 217
 218         tmp = (((unsigned long)&_end + PAGE_SIZE-1) & PAGE_MASK) - 8;
 219         if (tmp < (unsigned long)&_end)
 220                 tmp += PAGE_SIZE;
 221         initrd_header = (unsigned long *)tmp;
 222         if (initrd_header[0] == 0x494E5244) {
 223                 initrd_start = (unsigned long)&initrd_header[2];
 224                 initrd_end = initrd_start + initrd_header[1];
 225         }
 226         start_pfn = PFN_UP(CPHYSADDR((&_end)+(initrd_end - initrd_start) + PAGE_SIZE));
 227 #else
 228         /*
 229          * Partially used pages are not usable - thus
 230          * we are rounding upwards.
 231          */
 232         start_pfn = PFN_UP(CPHYSADDR(&_end));
 233 #endif  /* CONFIG_BLK_DEV_INITRD */
 234
 235 #ifndef CONFIG_SGI_IP27
 236         /* Find the highest page frame number we have available.  */
 237         max_pfn = 0;
 238         first_usable_pfn = -1UL;
 239         for (i = 0; i < boot_mem_map.nr_map; i++) {
 240                 unsigned long start, end;
 241
 242                 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
 243                         continue;
 244
 245                 start = PFN_UP(boot_mem_map.map[i].addr);
 246                 end = PFN_DOWN(boot_mem_map.map[i].addr
 247                       + boot_mem_map.map[i].size);
 248
 249                 if (start >= end)
 250                         continue;
 251                 if (end > max_pfn)
 252                         max_pfn = end;
 253                 if (start < first_usable_pfn) {
 254                         if (start > start_pfn) {
 255                                 first_usable_pfn = start;
 256                         } else if (end > start_pfn) {
 257                                 first_usable_pfn = start_pfn;
 258                         }
 259                 }
 260         }
 261
 262         /*
 263          * Determine low and high memory ranges
 264          */
 265         max_low_pfn = max_pfn;
 266         if (max_low_pfn > MAXMEM_PFN) {
 267                 max_low_pfn = MAXMEM_PFN;
 268 #ifndef CONFIG_HIGHMEM
 269                 /* Maximum memory usable is what is directly addressable */
 270                 printk(KERN_WARNING "Warning only %ldMB will be used.\n",
 271                        MAXMEM >> 20);
 272                 printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
 273 #endif
 274         }
 275
 276 #ifdef CONFIG_HIGHMEM
 277         /*
 278          * Crude, we really should make a better attempt at detecting
 279          * highstart_pfn
 280          */
 281         highstart_pfn = highend_pfn = max_pfn;
 282         if (max_pfn > MAXMEM_PFN) {
 283                 highstart_pfn = MAXMEM_PFN;
 284                 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
 285                        (highend_pfn - highstart_pfn) >> (20 - PAGE_SHIFT));
 286         }
 287 #endif
 288
 289         /* Initialize the boot-time allocator with low memory only.  */
 290         bootmap_size = init_bootmem(first_usable_pfn, max_low_pfn);
 291
 292         /*
 293          * Register fully available low RAM pages with the bootmem allocator.
 294          */
 295         for (i = 0; i < boot_mem_map.nr_map; i++) {
 296                 unsigned long curr_pfn, last_pfn, size;
 297
 298                 /*
 299                  * Reserve usable memory.
 300                  */
 301                 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
 302                         continue;
 303
 304                 /*
 305                  * We are rounding up the start address of usable memory:
 306                  */
 307                 curr_pfn = PFN_UP(boot_mem_map.map[i].addr);
 308                 if (curr_pfn >= max_low_pfn)
 309                         continue;
 310                 if (curr_pfn < start_pfn)
 311                         curr_pfn = start_pfn;
 312
 313                 /*
 314                  * ... and at the end of the usable range downwards:
 315                  */
 316                 last_pfn = PFN_DOWN(boot_mem_map.map[i].addr
 317                                     + boot_mem_map.map[i].size);
 318
 319                 if (last_pfn > max_low_pfn)
 320                         last_pfn = max_low_pfn;
 321
 322                 /*
 323                  * Only register lowmem part of lowmem segment with bootmem.
 324                  */
 325                 size = last_pfn - curr_pfn;
 326                 if (curr_pfn > PFN_DOWN(HIGHMEM_START))
 327                         continue;
 328                 if (curr_pfn + size - 1 > PFN_DOWN(HIGHMEM_START))
 329                         size = PFN_DOWN(HIGHMEM_START) - curr_pfn;
 330                 if (!size)
 331                         continue;
 332
 333                 /*
 334                  * ... finally, did all the rounding and playing
 335                  * around just make the area go away?
 336                  */
 337                 if (last_pfn <= curr_pfn)
 338                         continue;
 339
 340                 /* Register lowmem ranges */
 341                 free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size));
 342         }
 343
 344         /* Reserve the bootmap memory.  */
 345         reserve_bootmem(PFN_PHYS(first_usable_pfn), bootmap_size);
 346 #endif
 347
 348 #ifdef CONFIG_BLK_DEV_INITRD
 349         /* Board specific code should have set up initrd_start and initrd_end */
 350         ROOT_DEV = Root_RAM0;
 351         if (&__rd_start != &__rd_end) {
 352                 initrd_start = (unsigned long)&__rd_start;
 353                 initrd_end = (unsigned long)&__rd_end;
 354         }
 355         initrd_below_start_ok = 1;
 356         if (initrd_start) {
 357                 unsigned long initrd_size = ((unsigned char *)initrd_end) - ((unsigned char *)initrd_start);
 358                 printk("Initial ramdisk at: 0x%p (%lu bytes)\n",
 359                        (void *)initrd_start,
 360                        initrd_size);
 361
 362                 if (CPHYSADDR(initrd_end) > PFN_PHYS(max_low_pfn)) {
 363                         printk("initrd extends beyond end of memory "
 364                                "(0x%0*Lx > 0x%0*Lx)\ndisabling initrd\n",
 365                                sizeof(long) * 2, CPHYSADDR(initrd_end),
 366                                sizeof(long) * 2, PFN_PHYS(max_low_pfn));
 367                         initrd_start = initrd_end = 0;
 368                 }
 369         }
 370 #endif /* CONFIG_BLK_DEV_INITRD  */
 371 }
 372
 373 static inline void resource_init(void)
 374 {
 375         int i;
 376
 377         code_resource.start = virt_to_phys(&_text);
 378         code_resource.end = virt_to_phys(&_etext) - 1;
 379         data_resource.start = virt_to_phys(&_etext);
 380         data_resource.end = virt_to_phys(&_edata) - 1;
 381
 382         /*
 383          * Request address space for all standard RAM.
 384          */
 385         for (i = 0; i < boot_mem_map.nr_map; i++) {
 386                 struct resource *res;
 387                 unsigned long start, end;
 388
 389                 start = boot_mem_map.map[i].addr;
 390                 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
 391                 if (start >= MAXMEM)
 392                         continue;
 393                 if (end >= MAXMEM)
 394                         end = MAXMEM - 1;
 395
 396                 res = alloc_bootmem(sizeof(struct resource));
 397                 switch (boot_mem_map.map[i].type) {
 398                 case BOOT_MEM_RAM:
 399                 case BOOT_MEM_ROM_DATA:
 400                         res->name = "System RAM";
 401                         break;
 402                 case BOOT_MEM_RESERVED:
 403                 default:
 404                         res->name = "reserved";
 405                 }
 406
 407                 res->start = start;
 408                 res->end = end;
 409
 410                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 411                 request_resource(&iomem_resource, res);
 412
 413                 /*
 414                  *  We don't know which RAM region contains kernel data,
 415                  *  so we try it repeatedly and let the resource manager
 416                  *  test it.
 417                  */
 418                 request_resource(res, &code_resource);
 419                 request_resource(res, &data_resource);
 420         }
 421 }
 422
 423 #undef PFN_UP
 424 #undef PFN_DOWN
 425 #undef PFN_PHYS
 426
 427 #undef MAXMEM
 428 #undef MAXMEM_PFN
 429
 430 static int __initdata earlyinit_debug;
 431
 432 static int __init earlyinit_debug_setup(char *str)
 433 {
 434         earlyinit_debug = 1;
 435         return 1;
 436 }
 437 __setup("earlyinit_debug", earlyinit_debug_setup);
 438
 439 extern initcall_t __earlyinitcall_start, __earlyinitcall_end;
 440
 441 static void __init do_earlyinitcalls(void)
 442 {
 443         initcall_t *call, *start, *end;
 444
 445         start = &__earlyinitcall_start;
 446         end = &__earlyinitcall_end;
 447
 448         for (call = start; call < end; call++) {
 449                 if (earlyinit_debug)
 450                         printk("calling earlyinitcall 0x%p\n", *call);
 451
 452                 (*call)();
 453         }
 454 }
 455
 456 void __init setup_arch(char **cmdline_p)
 457 {
 458         unsigned int status;
 459
 460         cpu_probe();
 461         prom_init();
 462         cpu_report();
 463
 464 #ifdef CONFIG_MIPS32
 465         /* Disable coprocessors and set FPU for 16/32 FPR register model */
 466         status = read_c0_status();
 467         status &= ~(ST0_CU1|ST0_CU2|ST0_CU3|ST0_KX|ST0_SX|ST0_FR);
 468         status |= ST0_CU0;
 469         write_c0_status(status);
 470 #endif
 471 #ifdef CONFIG_MIPS64
 472         /*
 473          * On IP27, I am seeing the TS bit set when the kernel is loaded.
 474          * Maybe because the kernel is in ckseg0 and not xkphys? Clear it
 475          * anyway ...
 476          */
 477         status = read_c0_status();
 478         status &= ~(ST0_BEV|ST0_TS|ST0_CU1|ST0_CU2|ST0_CU3);
 479         status |= (ST0_CU0|ST0_KX|ST0_SX|ST0_FR);
 480         write_c0_status(status);
 481 #endif
 482
 483 #if defined(CONFIG_VT)
 484 #if defined(CONFIG_VGA_CONSOLE)
 485         conswitchp = &vga_con;
 486 #elif defined(CONFIG_DUMMY_CONSOLE)
 487         conswitchp = &dummy_con;
 488 #endif
 489 #endif
 490
 491         /* call board setup routine */
 492         do_earlyinitcalls();
 493
 494         strlcpy(command_line, arcs_cmdline, sizeof(command_line));
 495         strlcpy(saved_command_line, command_line, COMMAND_LINE_SIZE);
 496
 497         *cmdline_p = command_line;
 498
 499         parse_cmdline_early();
 500         bootmem_init();
 501         paging_init();
 502         resource_init();
 503 }
 504
 505 int __init fpu_disable(char *s)
 506 {
 507         cpu_data[0].options &= ~MIPS_CPU_FPU;
 508
 509         return 1;
 510 }
 511
 512 __setup("nofpu", fpu_disable);