release/src-rt-6.x.4708/linux/linux-2.6.36/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, 2007  Maciej W. Rozycki
  12  */
  13 #include <linux/init.h>
  14 #include <linux/ioport.h>
  15 #include <linux/module.h>
  16 #include <linux/screen_info.h>
  17 #include <linux/bootmem.h>
  18 #include <linux/initrd.h>
  19 #include <linux/root_dev.h>
  20 #include <linux/highmem.h>
  21 #include <linux/console.h>
  22 #include <linux/pfn.h>
  23 #include <linux/debugfs.h>
  24
  25 #include <asm/addrspace.h>
  26 #include <asm/bootinfo.h>
  27 #include <asm/bugs.h>
  28 #include <asm/cache.h>
  29 #include <asm/cpu.h>
  30 #include <asm/sections.h>
  31 #include <asm/setup.h>
  32 #include <asm/smp-ops.h>
  33 #include <asm/system.h>
  34
  35 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
  36
  37 EXPORT_SYMBOL(cpu_data);
  38
  39 #ifdef CONFIG_VT
  40 struct screen_info screen_info;
  41 #endif
  42
  43 /*
  44  * Despite it's name this variable is even if we don't have PCI
  45  */
  46 unsigned int PCI_DMA_BUS_IS_PHYS;
  47
  48 EXPORT_SYMBOL(PCI_DMA_BUS_IS_PHYS);
  49
  50 /*
  51  * Setup information
  52  *
  53  * These are initialized so they are in the .data section
  54  */
  55 unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
  56
  57 EXPORT_SYMBOL(mips_machtype);
  58
  59 struct boot_mem_map boot_mem_map;
  60
  61 static char __initdata command_line[COMMAND_LINE_SIZE];
  62 char __initdata arcs_cmdline[COMMAND_LINE_SIZE];
  63
  64 #ifdef CONFIG_CMDLINE_BOOL
  65 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
  66 #endif
  67
  68 /*
  69  * mips_io_port_base is the begin of the address space to which x86 style
  70  * I/O ports are mapped.
  71  */
  72 const unsigned long mips_io_port_base __read_mostly = -1;
  73 EXPORT_SYMBOL(mips_io_port_base);
  74
  75 static struct resource code_resource = { .name = "Kernel code", };
  76 static struct resource data_resource = { .name = "Kernel data", };
  77
  78 void __init add_memory_region(phys_t start, phys_t size, long type)
  79 {
  80         int x = boot_mem_map.nr_map;
  81         struct boot_mem_map_entry *prev = boot_mem_map.map + x - 1;
  82
  83         /* Sanity check */
  84         if (start + size < start) {
  85                 pr_warning("Trying to add an invalid memory region, skipped\n");
  86                 return;
  87         }
  88
  89         /*
  90          * Try to merge with previous entry if any.  This is far less than
  91          * perfect but is sufficient for most real world cases.
  92          */
  93         if (x && prev->addr + prev->size == start && prev->type == type) {
  94                 prev->size += size;
  95                 return;
  96         }
  97
  98         if (x == BOOT_MEM_MAP_MAX) {
  99                 pr_err("Ooops! Too many entries in the memory map!\n");
 100                 return;
 101         }
 102
 103         boot_mem_map.map[x].addr = start;
 104         boot_mem_map.map[x].size = size;
 105         boot_mem_map.map[x].type = type;
 106         boot_mem_map.nr_map++;
 107 }
 108
 109 static void __init print_memory_map(void)
 110 {
 111         int i;
 112         const int field = 2 * sizeof(unsigned long);
 113
 114         for (i = 0; i < boot_mem_map.nr_map; i++) {
 115                 printk(KERN_INFO " memory: %0*Lx @ %0*Lx ",
 116                        field, (unsigned long long) boot_mem_map.map[i].size,
 117                        field, (unsigned long long) boot_mem_map.map[i].addr);
 118
 119                 switch (boot_mem_map.map[i].type) {
 120                 case BOOT_MEM_RAM:
 121                         printk(KERN_CONT "(usable)\n");
 122                         break;
 123                 case BOOT_MEM_ROM_DATA:
 124                         printk(KERN_CONT "(ROM data)\n");
 125                         break;
 126                 case BOOT_MEM_RESERVED:
 127                         printk(KERN_CONT "(reserved)\n");
 128                         break;
 129                 default:
 130                         printk(KERN_CONT "type %lu\n", boot_mem_map.map[i].type);
 131                         break;
 132                 }
 133         }
 134 }
 135
 136 /*
 137  * Manage initrd
 138  */
 139 #ifdef CONFIG_BLK_DEV_INITRD
 140
 141 static int __init rd_start_early(char *p)
 142 {
 143         unsigned long start = memparse(p, &p);
 144
 145 #ifdef CONFIG_64BIT
 146         /* Guess if the sign extension was forgotten by bootloader */
 147         if (start < XKPHYS)
 148                 start = (int)start;
 149 #endif
 150         initrd_start = start;
 151         initrd_end += start;
 152         return 0;
 153 }
 154 early_param("rd_start", rd_start_early);
 155
 156 static int __init rd_size_early(char *p)
 157 {
 158         initrd_end += memparse(p, &p);
 159         return 0;
 160 }
 161 early_param("rd_size", rd_size_early);
 162
 163 /* it returns the next free pfn after initrd */
 164 static unsigned long __init init_initrd(void)
 165 {
 166         unsigned long end;
 167
 168         /*
 169          * Board specific code or command line parser should have
 170          * already set up initrd_start and initrd_end. In these cases
 171          * perfom sanity checks and use them if all looks good.
 172          */
 173         if (!initrd_start || initrd_end <= initrd_start)
 174                 goto disable;
 175
 176         if (initrd_start & ~PAGE_MASK) {
 177                 pr_err("initrd start must be page aligned\n");
 178                 goto disable;
 179         }
 180         if (initrd_start < PAGE_OFFSET) {
 181                 pr_err("initrd start < PAGE_OFFSET\n");
 182                 goto disable;
 183         }
 184
 185         /*
 186          * Sanitize initrd addresses. For example firmware
 187          * can't guess if they need to pass them through
 188          * 64-bits values if the kernel has been built in pure
 189          * 32-bit. We need also to switch from KSEG0 to XKPHYS
 190          * addresses now, so the code can now safely use __pa().
 191          */
 192         end = __pa(initrd_end);
 193         initrd_end = (unsigned long)__va(end);
 194         initrd_start = (unsigned long)__va(__pa(initrd_start));
 195
 196         ROOT_DEV = Root_RAM0;
 197         return PFN_UP(end);
 198 disable:
 199         initrd_start = 0;
 200         initrd_end = 0;
 201         return 0;
 202 }
 203
 204 static void __init finalize_initrd(void)
 205 {
 206         unsigned long size = initrd_end - initrd_start;
 207
 208         if (size == 0) {
 209                 printk(KERN_INFO "Initrd not found or empty");
 210                 goto disable;
 211         }
 212         if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
 213                 printk(KERN_ERR "Initrd extends beyond end of memory");
 214                 goto disable;
 215         }
 216
 217         reserve_bootmem(__pa(initrd_start), size, BOOTMEM_DEFAULT);
 218         initrd_below_start_ok = 1;
 219
 220         pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
 221                 initrd_start, size);
 222         return;
 223 disable:
 224         printk(KERN_CONT " - disabling initrd\n");
 225         initrd_start = 0;
 226         initrd_end = 0;
 227 }
 228
 229 #else  /* !CONFIG_BLK_DEV_INITRD */
 230
 231 static unsigned long __init init_initrd(void)
 232 {
 233         return 0;
 234 }
 235
 236 #define finalize_initrd()       do {} while (0)
 237
 238 #endif
 239
 240 /*
 241  * Initialize the bootmem allocator. It also setup initrd related data
 242  * if needed.
 243  */
 244 #ifdef CONFIG_SGI_IP27
 245
 246 static void __init bootmem_init(void)
 247 {
 248         init_initrd();
 249         finalize_initrd();
 250 }
 251
 252 #else  /* !CONFIG_SGI_IP27 */
 253
 254 static void __init bootmem_init(void)
 255 {
 256         unsigned long reserved_end;
 257         unsigned long mapstart = ~0UL;
 258         unsigned long bootmap_size;
 259         int i;
 260
 261         /*
 262          * Init any data related to initrd. It's a nop if INITRD is
 263          * not selected. Once that done we can determine the low bound
 264          * of usable memory.
 265          */
 266         reserved_end = max(init_initrd(),
 267                            (unsigned long) PFN_UP(__pa_symbol(&_end)));
 268
 269         /*
 270          * max_low_pfn is not a number of pages. The number of pages
 271          * of the system is given by 'max_low_pfn - min_low_pfn'.
 272          */
 273         min_low_pfn = ~0UL;
 274         max_low_pfn = 0;
 275
 276         /*
 277          * Find the highest page frame number we have available.
 278          */
 279         for (i = 0; i < boot_mem_map.nr_map; i++) {
 280                 unsigned long start, end;
 281
 282                 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
 283                         continue;
 284
 285                 start = PFN_UP(boot_mem_map.map[i].addr);
 286                 end = PFN_DOWN(boot_mem_map.map[i].addr
 287                                 + boot_mem_map.map[i].size);
 288
 289                 if (end > max_low_pfn)
 290                         max_low_pfn = end;
 291                 if (start < min_low_pfn)
 292                         min_low_pfn = start;
 293                 if (end <= reserved_end)
 294                         continue;
 295                 if (start >= mapstart)
 296                         continue;
 297                 mapstart = max(reserved_end, start);
 298         }
 299
 300         if (min_low_pfn >= max_low_pfn)
 301                 panic("Incorrect memory mapping !!!");
 302         if (min_low_pfn > ARCH_PFN_OFFSET) {
 303                 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
 304                         (min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page),
 305                         min_low_pfn - ARCH_PFN_OFFSET);
 306         } else if (min_low_pfn < ARCH_PFN_OFFSET) {
 307                 pr_info("%lu free pages won't be used\n",
 308                         ARCH_PFN_OFFSET - min_low_pfn);
 309         }
 310         min_low_pfn = ARCH_PFN_OFFSET;
 311
 312         /*
 313          * Determine low and high memory ranges
 314          */
 315         max_pfn = max_low_pfn;
 316         if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) {
 317 #ifdef CONFIG_HIGHMEM
 318                 highstart_pfn = PFN_DOWN(HIGHMEM_START);
 319                 highend_pfn = max_low_pfn;
 320 #endif
 321                 max_low_pfn = PFN_DOWN(HIGHMEM_START);
 322         }
 323
 324         /*
 325          * Initialize the boot-time allocator with low memory only.
 326          */
 327         bootmap_size = init_bootmem_node(NODE_DATA(0), mapstart,
 328                                          min_low_pfn, max_low_pfn);
 329
 330
 331         for (i = 0; i < boot_mem_map.nr_map; i++) {
 332                 unsigned long start, end;
 333
 334                 start = PFN_UP(boot_mem_map.map[i].addr);
 335                 end = PFN_DOWN(boot_mem_map.map[i].addr
 336                                 + boot_mem_map.map[i].size);
 337
 338                 if (start <= min_low_pfn)
 339                         start = min_low_pfn;
 340                 if (start >= end)
 341                         continue;
 342
 343 #ifndef CONFIG_HIGHMEM
 344                 if (end > max_low_pfn)
 345                         end = max_low_pfn;
 346
 347                 /*
 348                  * ... finally, is the area going away?
 349                  */
 350                 if (end <= start)
 351                         continue;
 352 #endif
 353
 354                 add_active_range(0, start, end);
 355         }
 356
 357         /*
 358          * Register fully available low RAM pages with the bootmem allocator.
 359          */
 360         for (i = 0; i < boot_mem_map.nr_map; i++) {
 361                 unsigned long start, end, size;
 362
 363                 /*
 364                  * Reserve usable memory.
 365                  */
 366                 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
 367                         continue;
 368
 369                 start = PFN_UP(boot_mem_map.map[i].addr);
 370                 end   = PFN_DOWN(boot_mem_map.map[i].addr
 371                                     + boot_mem_map.map[i].size);
 372                 /*
 373                  * We are rounding up the start address of usable memory
 374                  * and at the end of the usable range downwards.
 375                  */
 376                 if (start >= max_low_pfn)
 377                         continue;
 378                 if (start < reserved_end)
 379                         start = reserved_end;
 380                 if (end > max_low_pfn)
 381                         end = max_low_pfn;
 382
 383                 /*
 384                  * ... finally, is the area going away?
 385                  */
 386                 if (end <= start)
 387                         continue;
 388                 size = end - start;
 389
 390                 /* Register lowmem ranges */
 391                 free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
 392                 memory_present(0, start, end);
 393         }
 394
 395         /*
 396          * Reserve the bootmap memory.
 397          */
 398         reserve_bootmem(PFN_PHYS(mapstart), bootmap_size, BOOTMEM_DEFAULT);
 399
 400         /*
 401          * Reserve initrd memory if needed.
 402          */
 403         finalize_initrd();
 404 }
 405
 406 #endif  /* CONFIG_SGI_IP27 */
 407
 408 /*
 409  * arch_mem_init - initialize memory management subsystem
 410  *
 411  *  o plat_mem_setup() detects the memory configuration and will record detected
 412  *    memory areas using add_memory_region.
 413  *
 414  * At this stage the memory configuration of the system is known to the
 415  * kernel but generic memory management system is still entirely uninitialized.
 416  *
 417  *  o bootmem_init()
 418  *  o sparse_init()
 419  *  o paging_init()
 420  *
 421  * At this stage the bootmem allocator is ready to use.
 422  *
 423  * NOTE: historically plat_mem_setup did the entire platform initialization.
 424  *       This was rather impractical because it meant plat_mem_setup had to
 425  * get away without any kind of memory allocator.  To keep old code from
 426  * breaking plat_setup was just renamed to plat_setup and a second platform
 427  * initialization hook for anything else was introduced.
 428  */
 429
 430 static int usermem __initdata;
 431
 432 static int __init early_parse_mem(char *p)
 433 {
 434         unsigned long start, size;
 435
 436         /*
 437          * If a user specifies memory size, we
 438          * blow away any automatically generated
 439          * size.
 440          */
 441         if (usermem == 0) {
 442                 boot_mem_map.nr_map = 0;
 443                 usermem = 1;
 444         }
 445         start = 0;
 446         size = memparse(p, &p);
 447         if (*p == '@')
 448                 start = memparse(p + 1, &p);
 449
 450         add_memory_region(start, size, BOOT_MEM_RAM);
 451         return 0;
 452 }
 453 early_param("mem", early_parse_mem);
 454
 455 static void __init arch_mem_init(char **cmdline_p)
 456 {
 457         extern void plat_mem_setup(void);
 458
 459         /* call board setup routine */
 460         plat_mem_setup();
 461
 462         pr_info("Determined physical RAM map:\n");
 463         print_memory_map();
 464
 465 #ifdef CONFIG_CMDLINE_BOOL
 466 #ifdef CONFIG_CMDLINE_OVERRIDE
 467         strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 468 #else
 469         if (builtin_cmdline[0]) {
 470                 strlcat(arcs_cmdline, " ", COMMAND_LINE_SIZE);
 471                 strlcat(arcs_cmdline, builtin_cmdline, COMMAND_LINE_SIZE);
 472         }
 473         strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
 474 #endif
 475 #else
 476         strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
 477 #endif
 478         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 479
 480         *cmdline_p = command_line;
 481
 482         parse_early_param();
 483
 484         if (usermem) {
 485                 pr_info("User-defined physical RAM map:\n");
 486                 print_memory_map();
 487         }
 488
 489         bootmem_init();
 490         sparse_init();
 491         paging_init();
 492 }
 493
 494 static void __init resource_init(void)
 495 {
 496         int i;
 497
 498         if (UNCAC_BASE != IO_BASE)
 499                 return;
 500
 501         code_resource.start = __pa_symbol(&_text);
 502         code_resource.end = __pa_symbol(&_etext) - 1;
 503         data_resource.start = __pa_symbol(&_etext);
 504         data_resource.end = __pa_symbol(&_edata) - 1;
 505
 506         /*
 507          * Request address space for all standard RAM.
 508          */
 509         for (i = 0; i < boot_mem_map.nr_map; i++) {
 510                 struct resource *res;
 511                 unsigned long start, end;
 512
 513                 start = boot_mem_map.map[i].addr;
 514                 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
 515                 if (start >= HIGHMEM_START)
 516                         continue;
 517                 if (end >= HIGHMEM_START)
 518                         end = HIGHMEM_START - 1;
 519
 520                 res = alloc_bootmem(sizeof(struct resource));
 521                 switch (boot_mem_map.map[i].type) {
 522                 case BOOT_MEM_RAM:
 523                 case BOOT_MEM_ROM_DATA:
 524                         res->name = "System RAM";
 525                         break;
 526                 case BOOT_MEM_RESERVED:
 527                 default:
 528                         res->name = "reserved";
 529                 }
 530
 531                 res->start = start;
 532                 res->end = end;
 533
 534                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 535                 request_resource(&iomem_resource, res);
 536
 537                 /*
 538                  *  We don't know which RAM region contains kernel data,
 539                  *  so we try it repeatedly and let the resource manager
 540                  *  test it.
 541                  */
 542                 request_resource(res, &code_resource);
 543                 request_resource(res, &data_resource);
 544         }
 545 }
 546
 547 void __init setup_arch(char **cmdline_p)
 548 {
 549         cpu_probe();
 550         prom_init();
 551
 552 #ifdef CONFIG_EARLY_PRINTK
 553         setup_early_printk();
 554 #endif
 555         cpu_report();
 556         check_bugs_early();
 557
 558 #if defined(CONFIG_VT)
 559 #if defined(CONFIG_VGA_CONSOLE)
 560         conswitchp = &vga_con;
 561 #elif defined(CONFIG_DUMMY_CONSOLE)
 562         conswitchp = &dummy_con;
 563 #endif
 564 #endif
 565
 566         arch_mem_init(cmdline_p);
 567
 568         resource_init();
 569         plat_smp_setup();
 570 }
 571
 572 unsigned long kernelsp[NR_CPUS];
 573 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
 574
 575 #ifdef CONFIG_DEBUG_FS
 576 struct dentry *mips_debugfs_dir;
 577 static int __init debugfs_mips(void)
 578 {
 579         struct dentry *d;
 580
 581         d = debugfs_create_dir("mips", NULL);
 582         if (!d)
 583                 return -ENOMEM;
 584         mips_debugfs_dir = d;
 585         return 0;
 586 }
 587 arch_initcall(debugfs_mips);
 588 #endif