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/system.h>
  35 #include <asm/prom.h>
  36
  37 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
  38
  39 EXPORT_SYMBOL(cpu_data);
  40
  41 #ifdef CONFIG_VT
  42 struct screen_info screen_info;
  43 #endif
  44
  45 /*
  46  * Despite it's name this variable is even if we don't have PCI
  47  */
  48 unsigned int PCI_DMA_BUS_IS_PHYS;
  49
  50 EXPORT_SYMBOL(PCI_DMA_BUS_IS_PHYS);
  51
  52 /*
  53  * Setup information
  54  *
  55  * These are initialized so they are in the .data section
  56  */
  57 unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
  58
  59 EXPORT_SYMBOL(mips_machtype);
  60
  61 struct boot_mem_map boot_mem_map;
  62
  63 static char __initdata command_line[COMMAND_LINE_SIZE];
  64 char __initdata arcs_cmdline[COMMAND_LINE_SIZE];
  65
  66 #ifdef CONFIG_CMDLINE_BOOL
  67 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
  68 #endif
  69
  70 /*
  71  * mips_io_port_base is the begin of the address space to which x86 style
  72  * I/O ports are mapped.
  73  */
  74 const unsigned long mips_io_port_base = -1;
  75 EXPORT_SYMBOL(mips_io_port_base);
  76
  77 static struct resource code_resource = { .name = "Kernel code", };
  78 static struct resource data_resource = { .name = "Kernel data", };
  79
  80 void __init add_memory_region(phys_t start, phys_t size, long type)
  81 {
  82         int x = boot_mem_map.nr_map;
  83         struct boot_mem_map_entry *prev = boot_mem_map.map + x - 1;
  84
  85         /* Sanity check */
  86         if (start + size < start) {
  87                 pr_warning("Trying to add an invalid memory region, skipped\n");
  88                 return;
  89         }
  90
  91         /*
  92          * Try to merge with previous entry if any.  This is far less than
  93          * perfect but is sufficient for most real world cases.
  94          */
  95         if (x && prev->addr + prev->size == start && prev->type == type) {
  96                 prev->size += size;
  97                 return;
  98         }
  99
 100         if (x == BOOT_MEM_MAP_MAX) {
 101                 pr_err("Ooops! Too many entries in the memory map!\n");
 102                 return;
 103         }
 104
 105         boot_mem_map.map[x].addr = start;
 106         boot_mem_map.map[x].size = size;
 107         boot_mem_map.map[x].type = type;
 108         boot_mem_map.nr_map++;
 109 }
 110
 111 static void __init print_memory_map(void)
 112 {
 113         int i;
 114         const int field = 2 * sizeof(unsigned long);
 115
 116         for (i = 0; i < boot_mem_map.nr_map; i++) {
 117                 printk(KERN_INFO " memory: %0*Lx @ %0*Lx ",
 118                        field, (unsigned long long) boot_mem_map.map[i].size,
 119                        field, (unsigned long long) boot_mem_map.map[i].addr);
 120
 121                 switch (boot_mem_map.map[i].type) {
 122                 case BOOT_MEM_RAM:
 123                         printk(KERN_CONT "(usable)\n");
 124                         break;
 125                 case BOOT_MEM_INIT_RAM:
 126                         printk(KERN_CONT "(usable after init)\n");
 127                         break;
 128                 case BOOT_MEM_ROM_DATA:
 129                         printk(KERN_CONT "(ROM data)\n");
 130                         break;
 131                 case BOOT_MEM_RESERVED:
 132                         printk(KERN_CONT "(reserved)\n");
 133                         break;
 134                 default:
 135                         printk(KERN_CONT "type %lu\n", boot_mem_map.map[i].type);
 136                         break;
 137                 }
 138         }
 139 }
 140
 141 /*
 142  * Manage initrd
 143  */
 144 #ifdef CONFIG_BLK_DEV_INITRD
 145
 146 static int __init rd_start_early(char *p)
 147 {
 148         unsigned long start = memparse(p, &p);
 149
 150 #ifdef CONFIG_64BIT
 151         /* Guess if the sign extension was forgotten by bootloader */
 152         if (start < XKPHYS)
 153                 start = (int)start;
 154 #endif
 155         initrd_start = start;
 156         initrd_end += start;
 157         return 0;
 158 }
 159 early_param("rd_start", rd_start_early);
 160
 161 static int __init rd_size_early(char *p)
 162 {
 163         initrd_end += memparse(p, &p);
 164         return 0;
 165 }
 166 early_param("rd_size", rd_size_early);
 167
 168 /* it returns the next free pfn after initrd */
 169 static unsigned long __init init_initrd(void)
 170 {
 171         unsigned long end;
 172
 173         /*
 174          * Board specific code or command line parser should have
 175          * already set up initrd_start and initrd_end. In these cases
 176          * perfom sanity checks and use them if all looks good.
 177          */
 178         if (!initrd_start || initrd_end <= initrd_start)
 179                 goto disable;
 180
 181         if (initrd_start & ~PAGE_MASK) {
 182                 pr_err("initrd start must be page aligned\n");
 183                 goto disable;
 184         }
 185         if (initrd_start < PAGE_OFFSET) {
 186                 pr_err("initrd start < PAGE_OFFSET\n");
 187                 goto disable;
 188         }
 189
 190         /*
 191          * Sanitize initrd addresses. For example firmware
 192          * can't guess if they need to pass them through
 193          * 64-bits values if the kernel has been built in pure
 194          * 32-bit. We need also to switch from KSEG0 to XKPHYS
 195          * addresses now, so the code can now safely use __pa().
 196          */
 197         end = __pa(initrd_end);
 198         initrd_end = (unsigned long)__va(end);
 199         initrd_start = (unsigned long)__va(__pa(initrd_start));
 200
 201         ROOT_DEV = Root_RAM0;
 202         return PFN_UP(end);
 203 disable:
 204         initrd_start = 0;
 205         initrd_end = 0;
 206         return 0;
 207 }
 208
 209 static void __init finalize_initrd(void)
 210 {
 211         unsigned long size = initrd_end - initrd_start;
 212
 213         if (size == 0) {
 214                 printk(KERN_INFO "Initrd not found or empty");
 215                 goto disable;
 216         }
 217         if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
 218                 printk(KERN_ERR "Initrd extends beyond end of memory");
 219                 goto disable;
 220         }
 221
 222         reserve_bootmem(__pa(initrd_start), size, BOOTMEM_DEFAULT);
 223         initrd_below_start_ok = 1;
 224
 225         pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
 226                 initrd_start, size);
 227         return;
 228 disable:
 229         printk(KERN_CONT " - disabling initrd\n");
 230         initrd_start = 0;
 231         initrd_end = 0;
 232 }
 233
 234 #else  /* !CONFIG_BLK_DEV_INITRD */
 235
 236 static unsigned long __init init_initrd(void)
 237 {
 238         return 0;
 239 }
 240
 241 #define finalize_initrd()       do {} while (0)
 242
 243 #endif
 244
 245 /*
 246  * Initialize the bootmem allocator. It also setup initrd related data
 247  * if needed.
 248  */
 249 #ifdef CONFIG_SGI_IP27
 250
 251 static void __init bootmem_init(void)
 252 {
 253         init_initrd();
 254         finalize_initrd();
 255 }
 256
 257 #else  /* !CONFIG_SGI_IP27 */
 258
 259 static void __init bootmem_init(void)
 260 {
 261         unsigned long reserved_end;
 262         unsigned long mapstart = ~0UL;
 263         unsigned long bootmap_size;
 264         int i;
 265
 266         /*
 267          * Init any data related to initrd. It's a nop if INITRD is
 268          * not selected. Once that done we can determine the low bound
 269          * of usable memory.
 270          */
 271         reserved_end = max(init_initrd(),
 272                            (unsigned long) PFN_UP(__pa_symbol(&_end)));
 273
 274         /*
 275          * max_low_pfn is not a number of pages. The number of pages
 276          * of the system is given by 'max_low_pfn - min_low_pfn'.
 277          */
 278         min_low_pfn = ~0UL;
 279         max_low_pfn = 0;
 280
 281         /*
 282          * Find the highest page frame number we have available.
 283          */
 284         for (i = 0; i < boot_mem_map.nr_map; i++) {
 285                 unsigned long start, end;
 286
 287                 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
 288                         continue;
 289
 290                 start = PFN_UP(boot_mem_map.map[i].addr);
 291                 end = PFN_DOWN(boot_mem_map.map[i].addr
 292                                 + boot_mem_map.map[i].size);
 293
 294                 if (end > max_low_pfn)
 295                         max_low_pfn = end;
 296                 if (start < min_low_pfn)
 297                         min_low_pfn = start;
 298                 if (end <= reserved_end)
 299                         continue;
 300                 if (start >= mapstart)
 301                         continue;
 302                 mapstart = max(reserved_end, start);
 303         }
 304
 305         if (min_low_pfn >= max_low_pfn)
 306                 panic("Incorrect memory mapping !!!");
 307         if (min_low_pfn > ARCH_PFN_OFFSET) {
 308                 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
 309                         (min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page),
 310                         min_low_pfn - ARCH_PFN_OFFSET);
 311         } else if (min_low_pfn < ARCH_PFN_OFFSET) {
 312                 pr_info("%lu free pages won't be used\n",
 313                         ARCH_PFN_OFFSET - min_low_pfn);
 314         }
 315         min_low_pfn = ARCH_PFN_OFFSET;
 316
 317         /*
 318          * Determine low and high memory ranges
 319          */
 320         max_pfn = max_low_pfn;
 321         if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) {
 322 #ifdef CONFIG_HIGHMEM
 323                 highstart_pfn = PFN_DOWN(HIGHMEM_START);
 324                 highend_pfn = max_low_pfn;
 325 #endif
 326                 max_low_pfn = PFN_DOWN(HIGHMEM_START);
 327         }
 328
 329         /*
 330          * Initialize the boot-time allocator with low memory only.
 331          */
 332         bootmap_size = init_bootmem_node(NODE_DATA(0), mapstart,
 333                                          min_low_pfn, max_low_pfn);
 334
 335
 336         for (i = 0; i < boot_mem_map.nr_map; i++) {
 337                 unsigned long start, end;
 338
 339                 start = PFN_UP(boot_mem_map.map[i].addr);
 340                 end = PFN_DOWN(boot_mem_map.map[i].addr
 341                                 + boot_mem_map.map[i].size);
 342
 343                 if (start <= min_low_pfn)
 344                         start = min_low_pfn;
 345                 if (start >= end)
 346                         continue;
 347
 348 #ifndef CONFIG_HIGHMEM
 349                 if (end > max_low_pfn)
 350                         end = max_low_pfn;
 351
 352                 /*
 353                  * ... finally, is the area going away?
 354                  */
 355                 if (end <= start)
 356                         continue;
 357 #endif
 358
 359                 memblock_add_node(PFN_PHYS(start), PFN_PHYS(end - start), 0);
 360         }
 361
 362         /*
 363          * Register fully available low RAM pages with the bootmem allocator.
 364          */
 365         for (i = 0; i < boot_mem_map.nr_map; i++) {
 366                 unsigned long start, end, size;
 367
 368                 start = PFN_UP(boot_mem_map.map[i].addr);
 369                 end   = PFN_DOWN(boot_mem_map.map[i].addr
 370                                     + boot_mem_map.map[i].size);
 371
 372                 /*
 373                  * Reserve usable memory.
 374                  */
 375                 switch (boot_mem_map.map[i].type) {
 376                 case BOOT_MEM_RAM:
 377                         break;
 378                 case BOOT_MEM_INIT_RAM:
 379                         memory_present(0, start, end);
 380                         continue;
 381                 default:
 382                         /* Not usable memory */
 383                         continue;
 384                 }
 385
 386                 /*
 387                  * We are rounding up the start address of usable memory
 388                  * and at the end of the usable range downwards.
 389                  */
 390                 if (start >= max_low_pfn)
 391                         continue;
 392                 if (start < reserved_end)
 393                         start = reserved_end;
 394                 if (end > max_low_pfn)
 395                         end = max_low_pfn;
 396
 397                 /*
 398                  * ... finally, is the area going away?
 399                  */
 400                 if (end <= start)
 401                         continue;
 402                 size = end - start;
 403
 404                 /* Register lowmem ranges */
 405                 free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
 406                 memory_present(0, start, end);
 407         }
 408
 409         /*
 410          * Reserve the bootmap memory.
 411          */
 412         reserve_bootmem(PFN_PHYS(mapstart), bootmap_size, BOOTMEM_DEFAULT);
 413
 414         /*
 415          * Reserve initrd memory if needed.
 416          */
 417         finalize_initrd();
 418 }
 419
 420 #endif  /* CONFIG_SGI_IP27 */
 421
 422 /*
 423  * arch_mem_init - initialize memory management subsystem
 424  *
 425  *  o plat_mem_setup() detects the memory configuration and will record detected
 426  *    memory areas using add_memory_region.
 427  *
 428  * At this stage the memory configuration of the system is known to the
 429  * kernel but generic memory management system is still entirely uninitialized.
 430  *
 431  *  o bootmem_init()
 432  *  o sparse_init()
 433  *  o paging_init()
 434  *
 435  * At this stage the bootmem allocator is ready to use.
 436  *
 437  * NOTE: historically plat_mem_setup did the entire platform initialization.
 438  *       This was rather impractical because it meant plat_mem_setup had to
 439  * get away without any kind of memory allocator.  To keep old code from
 440  * breaking plat_setup was just renamed to plat_setup and a second platform
 441  * initialization hook for anything else was introduced.
 442  */
 443
 444 static int usermem __initdata;
 445
 446 static int __init early_parse_mem(char *p)
 447 {
 448         unsigned long start, size;
 449
 450         /*
 451          * If a user specifies memory size, we
 452          * blow away any automatically generated
 453          * size.
 454          */
 455         if (usermem == 0) {
 456                 boot_mem_map.nr_map = 0;
 457                 usermem = 1;
 458         }
 459         start = 0;
 460         size = memparse(p, &p);
 461         if (*p == '@')
 462                 start = memparse(p + 1, &p);
 463
 464         add_memory_region(start, size, BOOT_MEM_RAM);
 465         return 0;
 466 }
 467 early_param("mem", early_parse_mem);
 468
 469 static void __init arch_mem_init(char **cmdline_p)
 470 {
 471         phys_t init_mem, init_end, init_size;
 472
 473         extern void plat_mem_setup(void);
 474
 475         /* call board setup routine */
 476         plat_mem_setup();
 477
 478         init_mem = PFN_UP(__pa_symbol(&__init_begin)) << PAGE_SHIFT;
 479         init_end = PFN_DOWN(__pa_symbol(&__init_end)) << PAGE_SHIFT;
 480         init_size = init_end - init_mem;
 481         if (init_size) {
 482                 /* Make sure it is in the boot_mem_map */
 483                 int i, found;
 484                 found = 0;
 485                 for (i = 0; i < boot_mem_map.nr_map; i++) {
 486                         if (init_mem >= boot_mem_map.map[i].addr &&
 487                             init_mem < (boot_mem_map.map[i].addr +
 488                                         boot_mem_map.map[i].size)) {
 489                                 found = 1;
 490                                 break;
 491                         }
 492                 }
 493                 if (!found)
 494                         add_memory_region(init_mem, init_size,
 495                                           BOOT_MEM_INIT_RAM);
 496         }
 497
 498         pr_info("Determined physical RAM map:\n");
 499         print_memory_map();
 500
 501 #ifdef CONFIG_CMDLINE_BOOL
 502 #ifdef CONFIG_CMDLINE_OVERRIDE
 503         strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 504 #else
 505         if (builtin_cmdline[0]) {
 506                 strlcat(arcs_cmdline, " ", COMMAND_LINE_SIZE);
 507                 strlcat(arcs_cmdline, builtin_cmdline, COMMAND_LINE_SIZE);
 508         }
 509         strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
 510 #endif
 511 #else
 512         strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
 513 #endif
 514         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 515
 516         *cmdline_p = command_line;
 517
 518         parse_early_param();
 519
 520         if (usermem) {
 521                 pr_info("User-defined physical RAM map:\n");
 522                 print_memory_map();
 523         }
 524
 525         bootmem_init();
 526         device_tree_init();
 527         sparse_init();
 528         plat_swiotlb_setup();
 529         paging_init();
 530 }
 531
 532 static void __init resource_init(void)
 533 {
 534         int i;
 535
 536         if (UNCAC_BASE != IO_BASE)
 537                 return;
 538
 539         code_resource.start = __pa_symbol(&_text);
 540         code_resource.end = __pa_symbol(&_etext) - 1;
 541         data_resource.start = __pa_symbol(&_etext);
 542         data_resource.end = __pa_symbol(&_edata) - 1;
 543
 544         /*
 545          * Request address space for all standard RAM.
 546          */
 547         for (i = 0; i < boot_mem_map.nr_map; i++) {
 548                 struct resource *res;
 549                 unsigned long start, end;
 550
 551                 start = boot_mem_map.map[i].addr;
 552                 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
 553                 if (start >= HIGHMEM_START)
 554                         continue;
 555                 if (end >= HIGHMEM_START)
 556                         end = HIGHMEM_START - 1;
 557
 558                 res = alloc_bootmem(sizeof(struct resource));
 559                 switch (boot_mem_map.map[i].type) {
 560                 case BOOT_MEM_RAM:
 561                 case BOOT_MEM_INIT_RAM:
 562                 case BOOT_MEM_ROM_DATA:
 563                         res->name = "System RAM";
 564                         break;
 565                 case BOOT_MEM_RESERVED:
 566                 default:
 567                         res->name = "reserved";
 568                 }
 569
 570                 res->start = start;
 571                 res->end = end;
 572
 573                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 574                 request_resource(&iomem_resource, res);
 575
 576                 /*
 577                  *  We don't know which RAM region contains kernel data,
 578                  *  so we try it repeatedly and let the resource manager
 579                  *  test it.
 580                  */
 581                 request_resource(res, &code_resource);
 582                 request_resource(res, &data_resource);
 583         }
 584 }
 585
 586 void __init setup_arch(char **cmdline_p)
 587 {
 588         cpu_probe();
 589         prom_init();
 590
 591 #ifdef CONFIG_EARLY_PRINTK
 592         setup_early_printk();
 593 #endif
 594         cpu_report();
 595         check_bugs_early();
 596
 597 #if defined(CONFIG_VT)
 598 #if defined(CONFIG_VGA_CONSOLE)
 599         conswitchp = &vga_con;
 600 #elif defined(CONFIG_DUMMY_CONSOLE)
 601         conswitchp = &dummy_con;
 602 #endif
 603 #endif
 604
 605         arch_mem_init(cmdline_p);
 606
 607         resource_init();
 608         plat_smp_setup();
 609 }
 610
 611 unsigned long kernelsp[NR_CPUS];
 612 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
 613
 614 #ifdef CONFIG_DEBUG_FS
 615 struct dentry *mips_debugfs_dir;
 616 static int __init debugfs_mips(void)
 617 {
 618         struct dentry *d;
 619
 620         d = debugfs_create_dir("mips", NULL);
 621         if (!d)
 622                 return -ENOMEM;
 623         mips_debugfs_dir = d;
 624         return 0;
 625 }
 626 arch_initcall(debugfs_mips);
 627 #endif