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/export.h>
  16 #include <linux/screen_info.h>
  17 #include <linux/memblock.h>
  18 #include <linux/bootmem.h>
  19 #include <linux/initrd.h>
  20 #include <linux/root_dev.h>
  21 #include <linux/highmem.h>
  22 #include <linux/console.h>
  23 #include <linux/pfn.h>
  24 #include <linux/debugfs.h>
  25
  26 #include <asm/addrspace.h>
  27 #include <asm/bootinfo.h>
  28 #include <asm/bugs.h>
  29 #include <asm/cache.h>
  30 #include <asm/cpu.h>
  31 #include <asm/sections.h>
  32 #include <asm/setup.h>
  33 #include <asm/smp-ops.h>
  34 #include <asm/prom.h>
  35
  36 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
  37
  38 EXPORT_SYMBOL(cpu_data);
  39
  40 #ifdef CONFIG_VT
  41 struct screen_info screen_info;
  42 #endif
  43
  44 /*
  45  * Despite it's name this variable is even if we don't have PCI
  46  */
  47 unsigned int PCI_DMA_BUS_IS_PHYS;
  48
  49 EXPORT_SYMBOL(PCI_DMA_BUS_IS_PHYS);
  50
  51 /*
  52  * Setup information
  53  *
  54  * These are initialized so they are in the .data section
  55  */
  56 unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
  57
  58 EXPORT_SYMBOL(mips_machtype);
  59
  60 struct boot_mem_map boot_mem_map;
  61
  62 static char __initdata command_line[COMMAND_LINE_SIZE];
  63 char __initdata arcs_cmdline[COMMAND_LINE_SIZE];
  64
  65 #ifdef CONFIG_CMDLINE_BOOL
  66 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
  67 #endif
  68
  69 /*
  70  * mips_io_port_base is the begin of the address space to which x86 style
  71  * I/O ports are mapped.
  72  */
  73 const unsigned long mips_io_port_base = -1;
  74 EXPORT_SYMBOL(mips_io_port_base);
  75
  76 static struct resource code_resource = { .name = "Kernel code", };
  77 static struct resource data_resource = { .name = "Kernel data", };
  78
  79 void __init add_memory_region(phys_t start, phys_t size, long type)
  80 {
  81         int x = boot_mem_map.nr_map;
  82         struct boot_mem_map_entry *prev = boot_mem_map.map + x - 1;
  83
  84         /* Sanity check */
  85         if (start + size < start) {
  86                 pr_warning("Trying to add an invalid memory region, skipped\n");
  87                 return;
  88         }
  89
  90         /*
  91          * Try to merge with previous entry if any.  This is far less than
  92          * perfect but is sufficient for most real world cases.
  93          */
  94         if (x && prev->addr + prev->size == start && prev->type == type) {
  95                 prev->size += size;
  96                 return;
  97         }
  98
  99         if (x == BOOT_MEM_MAP_MAX) {
 100                 pr_err("Ooops! Too many entries in the memory map!\n");
 101                 return;
 102         }
 103
 104         boot_mem_map.map[x].addr = start;
 105         boot_mem_map.map[x].size = size;
 106         boot_mem_map.map[x].type = type;
 107         boot_mem_map.nr_map++;
 108 }
 109
 110 static void __init print_memory_map(void)
 111 {
 112         int i;
 113         const int field = 2 * sizeof(unsigned long);
 114
 115         for (i = 0; i < boot_mem_map.nr_map; i++) {
 116                 printk(KERN_INFO " memory: %0*Lx @ %0*Lx ",
 117                        field, (unsigned long long) boot_mem_map.map[i].size,
 118                        field, (unsigned long long) boot_mem_map.map[i].addr);
 119
 120                 switch (boot_mem_map.map[i].type) {
 121                 case BOOT_MEM_RAM:
 122                         printk(KERN_CONT "(usable)\n");
 123                         break;
 124                 case BOOT_MEM_INIT_RAM:
 125                         printk(KERN_CONT "(usable after init)\n");
 126                         break;
 127                 case BOOT_MEM_ROM_DATA:
 128                         printk(KERN_CONT "(ROM data)\n");
 129                         break;
 130                 case BOOT_MEM_RESERVED:
 131                         printk(KERN_CONT "(reserved)\n");
 132                         break;
 133                 default:
 134                         printk(KERN_CONT "type %lu\n", boot_mem_map.map[i].type);
 135                         break;
 136                 }
 137         }
 138 }
 139
 140 /*
 141  * Manage initrd
 142  */
 143 #ifdef CONFIG_BLK_DEV_INITRD
 144
 145 static int __init rd_start_early(char *p)
 146 {
 147         unsigned long start = memparse(p, &p);
 148
 149 #ifdef CONFIG_64BIT
 150         /* Guess if the sign extension was forgotten by bootloader */
 151         if (start < XKPHYS)
 152                 start = (int)start;
 153 #endif
 154         initrd_start = start;
 155         initrd_end += start;
 156         return 0;
 157 }
 158 early_param("rd_start", rd_start_early);
 159
 160 static int __init rd_size_early(char *p)
 161 {
 162         initrd_end += memparse(p, &p);
 163         return 0;
 164 }
 165 early_param("rd_size", rd_size_early);
 166
 167 /* it returns the next free pfn after initrd */
 168 static unsigned long __init init_initrd(void)
 169 {
 170         unsigned long end;
 171
 172         /*
 173          * Board specific code or command line parser should have
 174          * already set up initrd_start and initrd_end. In these cases
 175          * perfom sanity checks and use them if all looks good.
 176          */
 177         if (!initrd_start || initrd_end <= initrd_start)
 178                 goto disable;
 179
 180         if (initrd_start & ~PAGE_MASK) {
 181                 pr_err("initrd start must be page aligned\n");
 182                 goto disable;
 183         }
 184         if (initrd_start < PAGE_OFFSET) {
 185                 pr_err("initrd start < PAGE_OFFSET\n");
 186                 goto disable;
 187         }
 188
 189         /*
 190          * Sanitize initrd addresses. For example firmware
 191          * can't guess if they need to pass them through
 192          * 64-bits values if the kernel has been built in pure
 193          * 32-bit. We need also to switch from KSEG0 to XKPHYS
 194          * addresses now, so the code can now safely use __pa().
 195          */
 196         end = __pa(initrd_end);
 197         initrd_end = (unsigned long)__va(end);
 198         initrd_start = (unsigned long)__va(__pa(initrd_start));
 199
 200         ROOT_DEV = Root_RAM0;
 201         return PFN_UP(end);
 202 disable:
 203         initrd_start = 0;
 204         initrd_end = 0;
 205         return 0;
 206 }
 207
 208 static void __init finalize_initrd(void)
 209 {
 210         unsigned long size = initrd_end - initrd_start;
 211
 212         if (size == 0) {
 213                 printk(KERN_INFO "Initrd not found or empty");
 214                 goto disable;
 215         }
 216         if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
 217                 printk(KERN_ERR "Initrd extends beyond end of memory");
 218                 goto disable;
 219         }
 220
 221         reserve_bootmem(__pa(initrd_start), size, BOOTMEM_DEFAULT);
 222         initrd_below_start_ok = 1;
 223
 224         pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
 225                 initrd_start, size);
 226         return;
 227 disable:
 228         printk(KERN_CONT " - disabling initrd\n");
 229         initrd_start = 0;
 230         initrd_end = 0;
 231 }
 232
 233 #else  /* !CONFIG_BLK_DEV_INITRD */
 234
 235 static unsigned long __init init_initrd(void)
 236 {
 237         return 0;
 238 }
 239
 240 #define finalize_initrd()       do {} while (0)
 241
 242 #endif
 243
 244 /*
 245  * Initialize the bootmem allocator. It also setup initrd related data
 246  * if needed.
 247  */
 248 #ifdef CONFIG_SGI_IP27
 249
 250 static void __init bootmem_init(void)
 251 {
 252         init_initrd();
 253         finalize_initrd();
 254 }
 255
 256 #else  /* !CONFIG_SGI_IP27 */
 257
 258 static void __init bootmem_init(void)
 259 {
 260         unsigned long reserved_end;
 261         unsigned long mapstart = ~0UL;
 262         unsigned long bootmap_size;
 263         int i;
 264
 265         /*
 266          * Init any data related to initrd. It's a nop if INITRD is
 267          * not selected. Once that done we can determine the low bound
 268          * of usable memory.
 269          */
 270         reserved_end = max(init_initrd(),
 271                            (unsigned long) PFN_UP(__pa_symbol(&_end)));
 272
 273         /*
 274          * max_low_pfn is not a number of pages. The number of pages
 275          * of the system is given by 'max_low_pfn - min_low_pfn'.
 276          */
 277         min_low_pfn = ~0UL;
 278         max_low_pfn = 0;
 279
 280         /*
 281          * Find the highest page frame number we have available.
 282          */
 283         for (i = 0; i < boot_mem_map.nr_map; i++) {
 284                 unsigned long start, end;
 285
 286                 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
 287                         continue;
 288
 289                 start = PFN_UP(boot_mem_map.map[i].addr);
 290                 end = PFN_DOWN(boot_mem_map.map[i].addr
 291                                 + boot_mem_map.map[i].size);
 292
 293                 if (end > max_low_pfn)
 294                         max_low_pfn = end;
 295                 if (start < min_low_pfn)
 296                         min_low_pfn = start;
 297                 if (end <= reserved_end)
 298                         continue;
 299                 if (start >= mapstart)
 300                         continue;
 301                 mapstart = max(reserved_end, start);
 302         }
 303
 304         if (min_low_pfn >= max_low_pfn)
 305                 panic("Incorrect memory mapping !!!");
 306         if (min_low_pfn > ARCH_PFN_OFFSET) {
 307                 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
 308                         (min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page),
 309                         min_low_pfn - ARCH_PFN_OFFSET);
 310         } else if (min_low_pfn < ARCH_PFN_OFFSET) {
 311                 pr_info("%lu free pages won't be used\n",
 312                         ARCH_PFN_OFFSET - min_low_pfn);
 313         }
 314         min_low_pfn = ARCH_PFN_OFFSET;
 315
 316         /*
 317          * Determine low and high memory ranges
 318          */
 319         max_pfn = max_low_pfn;
 320         if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) {
 321 #ifdef CONFIG_HIGHMEM
 322                 highstart_pfn = PFN_DOWN(HIGHMEM_START);
 323                 highend_pfn = max_low_pfn;
 324 #endif
 325                 max_low_pfn = PFN_DOWN(HIGHMEM_START);
 326         }
 327
 328         /*
 329          * Initialize the boot-time allocator with low memory only.
 330          */
 331         bootmap_size = init_bootmem_node(NODE_DATA(0), mapstart,
 332                                          min_low_pfn, max_low_pfn);
 333
 334
 335         for (i = 0; i < boot_mem_map.nr_map; i++) {
 336                 unsigned long start, end;
 337
 338                 start = PFN_UP(boot_mem_map.map[i].addr);
 339                 end = PFN_DOWN(boot_mem_map.map[i].addr
 340                                 + boot_mem_map.map[i].size);
 341
 342                 if (start <= min_low_pfn)
 343                         start = min_low_pfn;
 344                 if (start >= end)
 345                         continue;
 346
 347 #ifndef CONFIG_HIGHMEM
 348                 if (end > max_low_pfn)
 349                         end = max_low_pfn;
 350
 351                 /*
 352                  * ... finally, is the area going away?
 353                  */
 354                 if (end <= start)
 355                         continue;
 356 #endif
 357
 358                 memblock_add_node(PFN_PHYS(start), PFN_PHYS(end - start), 0);
 359         }
 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 start, end, size;
 366
 367                 start = PFN_UP(boot_mem_map.map[i].addr);
 368                 end   = PFN_DOWN(boot_mem_map.map[i].addr
 369                                     + boot_mem_map.map[i].size);
 370
 371                 /*
 372                  * Reserve usable memory.
 373                  */
 374                 switch (boot_mem_map.map[i].type) {
 375                 case BOOT_MEM_RAM:
 376                         break;
 377                 case BOOT_MEM_INIT_RAM:
 378                         memory_present(0, start, end);
 379                         continue;
 380                 default:
 381                         /* Not usable memory */
 382                         continue;
 383                 }
 384
 385                 /*
 386                  * We are rounding up the start address of usable memory
 387                  * and at the end of the usable range downwards.
 388                  */
 389                 if (start >= max_low_pfn)
 390                         continue;
 391                 if (start < reserved_end)
 392                         start = reserved_end;
 393                 if (end > max_low_pfn)
 394                         end = max_low_pfn;
 395
 396                 /*
 397                  * ... finally, is the area going away?
 398                  */
 399                 if (end <= start)
 400                         continue;
 401                 size = end - start;
 402
 403                 /* Register lowmem ranges */
 404                 free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
 405                 memory_present(0, start, end);
 406         }
 407
 408         /*
 409          * Reserve the bootmap memory.
 410          */
 411         reserve_bootmem(PFN_PHYS(mapstart), bootmap_size, BOOTMEM_DEFAULT);
 412
 413         /*
 414          * Reserve initrd memory if needed.
 415          */
 416         finalize_initrd();
 417 }
 418
 419 #endif  /* CONFIG_SGI_IP27 */
 420
 421 /*
 422  * arch_mem_init - initialize memory management subsystem
 423  *
 424  *  o plat_mem_setup() detects the memory configuration and will record detected
 425  *    memory areas using add_memory_region.
 426  *
 427  * At this stage the memory configuration of the system is known to the
 428  * kernel but generic memory management system is still entirely uninitialized.
 429  *
 430  *  o bootmem_init()
 431  *  o sparse_init()
 432  *  o paging_init()
 433  *
 434  * At this stage the bootmem allocator is ready to use.
 435  *
 436  * NOTE: historically plat_mem_setup did the entire platform initialization.
 437  *       This was rather impractical because it meant plat_mem_setup had to
 438  * get away without any kind of memory allocator.  To keep old code from
 439  * breaking plat_setup was just renamed to plat_setup and a second platform
 440  * initialization hook for anything else was introduced.
 441  */
 442
 443 static int usermem __initdata;
 444
 445 static int __init early_parse_mem(char *p)
 446 {
 447         unsigned long start, size;
 448
 449         /*
 450          * If a user specifies memory size, we
 451          * blow away any automatically generated
 452          * size.
 453          */
 454         if (usermem == 0) {
 455                 boot_mem_map.nr_map = 0;
 456                 usermem = 1;
 457         }
 458         start = 0;
 459         size = memparse(p, &p);
 460         if (*p == '@')
 461                 start = memparse(p + 1, &p);
 462
 463         add_memory_region(start, size, BOOT_MEM_RAM);
 464         return 0;
 465 }
 466 early_param("mem", early_parse_mem);
 467
 468 static void __init arch_mem_init(char **cmdline_p)
 469 {
 470         phys_t init_mem, init_end, init_size;
 471
 472         extern void plat_mem_setup(void);
 473
 474         /* call board setup routine */
 475         plat_mem_setup();
 476
 477         init_mem = PFN_UP(__pa_symbol(&__init_begin)) << PAGE_SHIFT;
 478         init_end = PFN_DOWN(__pa_symbol(&__init_end)) << PAGE_SHIFT;
 479         init_size = init_end - init_mem;
 480         if (init_size) {
 481                 /* Make sure it is in the boot_mem_map */
 482                 int i, found;
 483                 found = 0;
 484                 for (i = 0; i < boot_mem_map.nr_map; i++) {
 485                         if (init_mem >= boot_mem_map.map[i].addr &&
 486                             init_mem < (boot_mem_map.map[i].addr +
 487                                         boot_mem_map.map[i].size)) {
 488                                 found = 1;
 489                                 break;
 490                         }
 491                 }
 492                 if (!found)
 493                         add_memory_region(init_mem, init_size,
 494                                           BOOT_MEM_INIT_RAM);
 495         }
 496
 497         pr_info("Determined physical RAM map:\n");
 498         print_memory_map();
 499
 500 #ifdef CONFIG_CMDLINE_BOOL
 501 #ifdef CONFIG_CMDLINE_OVERRIDE
 502         strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 503 #else
 504         if (builtin_cmdline[0]) {
 505                 strlcat(arcs_cmdline, " ", COMMAND_LINE_SIZE);
 506                 strlcat(arcs_cmdline, builtin_cmdline, COMMAND_LINE_SIZE);
 507         }
 508         strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
 509 #endif
 510 #else
 511         strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
 512 #endif
 513         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 514
 515         *cmdline_p = command_line;
 516
 517         parse_early_param();
 518
 519         if (usermem) {
 520                 pr_info("User-defined physical RAM map:\n");
 521                 print_memory_map();
 522         }
 523
 524         bootmem_init();
 525         device_tree_init();
 526         sparse_init();
 527         plat_swiotlb_setup();
 528         paging_init();
 529 }
 530
 531 static void __init resource_init(void)
 532 {
 533         int i;
 534
 535         if (UNCAC_BASE != IO_BASE)
 536                 return;
 537
 538         code_resource.start = __pa_symbol(&_text);
 539         code_resource.end = __pa_symbol(&_etext) - 1;
 540         data_resource.start = __pa_symbol(&_etext);
 541         data_resource.end = __pa_symbol(&_edata) - 1;
 542
 543         /*
 544          * Request address space for all standard RAM.
 545          */
 546         for (i = 0; i < boot_mem_map.nr_map; i++) {
 547                 struct resource *res;
 548                 unsigned long start, end;
 549
 550                 start = boot_mem_map.map[i].addr;
 551                 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
 552                 if (start >= HIGHMEM_START)
 553                         continue;
 554                 if (end >= HIGHMEM_START)
 555                         end = HIGHMEM_START - 1;
 556
 557                 res = alloc_bootmem(sizeof(struct resource));
 558                 switch (boot_mem_map.map[i].type) {
 559                 case BOOT_MEM_RAM:
 560                 case BOOT_MEM_INIT_RAM:
 561                 case BOOT_MEM_ROM_DATA:
 562                         res->name = "System RAM";
 563                         break;
 564                 case BOOT_MEM_RESERVED:
 565                 default:
 566                         res->name = "reserved";
 567                 }
 568
 569                 res->start = start;
 570                 res->end = end;
 571
 572                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 573                 request_resource(&iomem_resource, res);
 574
 575                 /*
 576                  *  We don't know which RAM region contains kernel data,
 577                  *  so we try it repeatedly and let the resource manager
 578                  *  test it.
 579                  */
 580                 request_resource(res, &code_resource);
 581                 request_resource(res, &data_resource);
 582         }
 583 }
 584
 585 void __init setup_arch(char **cmdline_p)
 586 {
 587         cpu_probe();
 588         prom_init();
 589
 590 #ifdef CONFIG_EARLY_PRINTK
 591         setup_early_printk();
 592 #endif
 593         cpu_report();
 594         check_bugs_early();
 595
 596 #if defined(CONFIG_VT)
 597 #if defined(CONFIG_VGA_CONSOLE)
 598         conswitchp = &vga_con;
 599 #elif defined(CONFIG_DUMMY_CONSOLE)
 600         conswitchp = &dummy_con;
 601 #endif
 602 #endif
 603
 604         arch_mem_init(cmdline_p);
 605
 606         resource_init();
 607         plat_smp_setup();
 608
 609         cpu_cache_init();
 610 }
 611
 612 unsigned long kernelsp[NR_CPUS];
 613 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
 614
 615 #ifdef CONFIG_DEBUG_FS
 616 struct dentry *mips_debugfs_dir;
 617 static int __init debugfs_mips(void)
 618 {
 619         struct dentry *d;
 620
 621         d = debugfs_create_dir("mips", NULL);
 622         if (!d)
 623                 return -ENOMEM;
 624         mips_debugfs_dir = d;
 625         return 0;
 626 }
 627 arch_initcall(debugfs_mips);
 628 #endif