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 #include <linux/kexec.h>
  26
  27 #include <asm/addrspace.h>
  28 #include <asm/bootinfo.h>
  29 #include <asm/bugs.h>
  30 #include <asm/cache.h>
  31 #include <asm/cpu.h>
  32 #include <asm/sections.h>
  33 #include <asm/setup.h>
  34 #include <asm/smp-ops.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         int i;
  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 existing entry, if any.
  93          */
  94         for (i = 0; i < boot_mem_map.nr_map; i++) {
  95                 struct boot_mem_map_entry *entry = boot_mem_map.map + i;
  96                 unsigned long top;
  97
  98                 if (entry->type != type)
  99                         continue;
 100
 101                 if (start + size < entry->addr)
 102                         continue;                       /* no overlap */
 103
 104                 if (entry->addr + entry->size < start)
 105                         continue;                       /* no overlap */
 106
 107                 top = max(entry->addr + entry->size, start + size);
 108                 entry->addr = min(entry->addr, start);
 109                 entry->size = top - entry->addr;
 110
 111                 return;
 112         }
 113
 114         if (boot_mem_map.nr_map == BOOT_MEM_MAP_MAX) {
 115                 pr_err("Ooops! Too many entries in the memory map!\n");
 116                 return;
 117         }
 118
 119         boot_mem_map.map[x].addr = start;
 120         boot_mem_map.map[x].size = size;
 121         boot_mem_map.map[x].type = type;
 122         boot_mem_map.nr_map++;
 123 }
 124
 125 static void __init print_memory_map(void)
 126 {
 127         int i;
 128         const int field = 2 * sizeof(unsigned long);
 129
 130         for (i = 0; i < boot_mem_map.nr_map; i++) {
 131                 printk(KERN_INFO " memory: %0*Lx @ %0*Lx ",
 132                        field, (unsigned long long) boot_mem_map.map[i].size,
 133                        field, (unsigned long long) boot_mem_map.map[i].addr);
 134
 135                 switch (boot_mem_map.map[i].type) {
 136                 case BOOT_MEM_RAM:
 137                         printk(KERN_CONT "(usable)\n");
 138                         break;
 139                 case BOOT_MEM_INIT_RAM:
 140                         printk(KERN_CONT "(usable after init)\n");
 141                         break;
 142                 case BOOT_MEM_ROM_DATA:
 143                         printk(KERN_CONT "(ROM data)\n");
 144                         break;
 145                 case BOOT_MEM_RESERVED:
 146                         printk(KERN_CONT "(reserved)\n");
 147                         break;
 148                 default:
 149                         printk(KERN_CONT "type %lu\n", boot_mem_map.map[i].type);
 150                         break;
 151                 }
 152         }
 153 }
 154
 155 /*
 156  * Manage initrd
 157  */
 158 #ifdef CONFIG_BLK_DEV_INITRD
 159
 160 static int __init rd_start_early(char *p)
 161 {
 162         unsigned long start = memparse(p, &p);
 163
 164 #ifdef CONFIG_64BIT
 165         /* Guess if the sign extension was forgotten by bootloader */
 166         if (start < XKPHYS)
 167                 start = (int)start;
 168 #endif
 169         initrd_start = start;
 170         initrd_end += start;
 171         return 0;
 172 }
 173 early_param("rd_start", rd_start_early);
 174
 175 static int __init rd_size_early(char *p)
 176 {
 177         initrd_end += memparse(p, &p);
 178         return 0;
 179 }
 180 early_param("rd_size", rd_size_early);
 181
 182 /* it returns the next free pfn after initrd */
 183 static unsigned long __init init_initrd(void)
 184 {
 185         unsigned long end;
 186
 187         /*
 188          * Board specific code or command line parser should have
 189          * already set up initrd_start and initrd_end. In these cases
 190          * perfom sanity checks and use them if all looks good.
 191          */
 192         if (!initrd_start || initrd_end <= initrd_start)
 193                 goto disable;
 194
 195         if (initrd_start & ~PAGE_MASK) {
 196                 pr_err("initrd start must be page aligned\n");
 197                 goto disable;
 198         }
 199         if (initrd_start < PAGE_OFFSET) {
 200                 pr_err("initrd start < PAGE_OFFSET\n");
 201                 goto disable;
 202         }
 203
 204         /*
 205          * Sanitize initrd addresses. For example firmware
 206          * can't guess if they need to pass them through
 207          * 64-bits values if the kernel has been built in pure
 208          * 32-bit. We need also to switch from KSEG0 to XKPHYS
 209          * addresses now, so the code can now safely use __pa().
 210          */
 211         end = __pa(initrd_end);
 212         initrd_end = (unsigned long)__va(end);
 213         initrd_start = (unsigned long)__va(__pa(initrd_start));
 214
 215         ROOT_DEV = Root_RAM0;
 216         return PFN_UP(end);
 217 disable:
 218         initrd_start = 0;
 219         initrd_end = 0;
 220         return 0;
 221 }
 222
 223 static void __init finalize_initrd(void)
 224 {
 225         unsigned long size = initrd_end - initrd_start;
 226
 227         if (size == 0) {
 228                 printk(KERN_INFO "Initrd not found or empty");
 229                 goto disable;
 230         }
 231         if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
 232                 printk(KERN_ERR "Initrd extends beyond end of memory");
 233                 goto disable;
 234         }
 235
 236         reserve_bootmem(__pa(initrd_start), size, BOOTMEM_DEFAULT);
 237         initrd_below_start_ok = 1;
 238
 239         pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
 240                 initrd_start, size);
 241         return;
 242 disable:
 243         printk(KERN_CONT " - disabling initrd\n");
 244         initrd_start = 0;
 245         initrd_end = 0;
 246 }
 247
 248 #else  /* !CONFIG_BLK_DEV_INITRD */
 249
 250 static unsigned long __init init_initrd(void)
 251 {
 252         return 0;
 253 }
 254
 255 #define finalize_initrd()       do {} while (0)
 256
 257 #endif
 258
 259 /*
 260  * Initialize the bootmem allocator. It also setup initrd related data
 261  * if needed.
 262  */
 263 #ifdef CONFIG_SGI_IP27
 264
 265 static void __init bootmem_init(void)
 266 {
 267         init_initrd();
 268         finalize_initrd();
 269 }
 270
 271 #else  /* !CONFIG_SGI_IP27 */
 272
 273 static void __init bootmem_init(void)
 274 {
 275         unsigned long reserved_end;
 276         unsigned long mapstart = ~0UL;
 277         unsigned long bootmap_size;
 278         int i;
 279
 280         /*
 281          * Init any data related to initrd. It's a nop if INITRD is
 282          * not selected. Once that done we can determine the low bound
 283          * of usable memory.
 284          */
 285         reserved_end = max(init_initrd(),
 286                            (unsigned long) PFN_UP(__pa_symbol(&_end)));
 287
 288         /*
 289          * max_low_pfn is not a number of pages. The number of pages
 290          * of the system is given by 'max_low_pfn - min_low_pfn'.
 291          */
 292         min_low_pfn = ~0UL;
 293         max_low_pfn = 0;
 294
 295         /*
 296          * Find the highest page frame number we have available.
 297          */
 298         for (i = 0; i < boot_mem_map.nr_map; i++) {
 299                 unsigned long start, end;
 300
 301                 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
 302                         continue;
 303
 304                 start = PFN_UP(boot_mem_map.map[i].addr);
 305                 end = PFN_DOWN(boot_mem_map.map[i].addr
 306                                 + boot_mem_map.map[i].size);
 307
 308                 if (end > max_low_pfn)
 309                         max_low_pfn = end;
 310                 if (start < min_low_pfn)
 311                         min_low_pfn = start;
 312                 if (end <= reserved_end)
 313                         continue;
 314                 if (start >= mapstart)
 315                         continue;
 316                 mapstart = max(reserved_end, start);
 317         }
 318
 319         if (min_low_pfn >= max_low_pfn)
 320                 panic("Incorrect memory mapping !!!");
 321         if (min_low_pfn > ARCH_PFN_OFFSET) {
 322                 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
 323                         (min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page),
 324                         min_low_pfn - ARCH_PFN_OFFSET);
 325         } else if (min_low_pfn < ARCH_PFN_OFFSET) {
 326                 pr_info("%lu free pages won't be used\n",
 327                         ARCH_PFN_OFFSET - min_low_pfn);
 328         }
 329         min_low_pfn = ARCH_PFN_OFFSET;
 330
 331         /*
 332          * Determine low and high memory ranges
 333          */
 334         max_pfn = max_low_pfn;
 335         if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) {
 336 #ifdef CONFIG_HIGHMEM
 337                 highstart_pfn = PFN_DOWN(HIGHMEM_START);
 338                 highend_pfn = max_low_pfn;
 339 #endif
 340                 max_low_pfn = PFN_DOWN(HIGHMEM_START);
 341         }
 342
 343         /*
 344          * Initialize the boot-time allocator with low memory only.
 345          */
 346         bootmap_size = init_bootmem_node(NODE_DATA(0), mapstart,
 347                                          min_low_pfn, max_low_pfn);
 348
 349
 350         for (i = 0; i < boot_mem_map.nr_map; i++) {
 351                 unsigned long start, end;
 352
 353                 start = PFN_UP(boot_mem_map.map[i].addr);
 354                 end = PFN_DOWN(boot_mem_map.map[i].addr
 355                                 + boot_mem_map.map[i].size);
 356
 357                 if (start <= min_low_pfn)
 358                         start = min_low_pfn;
 359                 if (start >= end)
 360                         continue;
 361
 362 #ifndef CONFIG_HIGHMEM
 363                 if (end > max_low_pfn)
 364                         end = max_low_pfn;
 365
 366                 /*
 367                  * ... finally, is the area going away?
 368                  */
 369                 if (end <= start)
 370                         continue;
 371 #endif
 372
 373                 memblock_add_node(PFN_PHYS(start), PFN_PHYS(end - start), 0);
 374         }
 375
 376         /*
 377          * Register fully available low RAM pages with the bootmem allocator.
 378          */
 379         for (i = 0; i < boot_mem_map.nr_map; i++) {
 380                 unsigned long start, end, size;
 381
 382                 start = PFN_UP(boot_mem_map.map[i].addr);
 383                 end   = PFN_DOWN(boot_mem_map.map[i].addr
 384                                     + boot_mem_map.map[i].size);
 385
 386                 /*
 387                  * Reserve usable memory.
 388                  */
 389                 switch (boot_mem_map.map[i].type) {
 390                 case BOOT_MEM_RAM:
 391                         break;
 392                 case BOOT_MEM_INIT_RAM:
 393                         memory_present(0, start, end);
 394                         continue;
 395                 default:
 396                         /* Not usable memory */
 397                         continue;
 398                 }
 399
 400                 /*
 401                  * We are rounding up the start address of usable memory
 402                  * and at the end of the usable range downwards.
 403                  */
 404                 if (start >= max_low_pfn)
 405                         continue;
 406                 if (start < reserved_end)
 407                         start = reserved_end;
 408                 if (end > max_low_pfn)
 409                         end = max_low_pfn;
 410
 411                 /*
 412                  * ... finally, is the area going away?
 413                  */
 414                 if (end <= start)
 415                         continue;
 416                 size = end - start;
 417
 418                 /* Register lowmem ranges */
 419                 free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
 420                 memory_present(0, start, end);
 421         }
 422
 423         /*
 424          * Reserve the bootmap memory.
 425          */
 426         reserve_bootmem(PFN_PHYS(mapstart), bootmap_size, BOOTMEM_DEFAULT);
 427
 428         /*
 429          * Reserve initrd memory if needed.
 430          */
 431         finalize_initrd();
 432 }
 433
 434 #endif  /* CONFIG_SGI_IP27 */
 435
 436 /*
 437  * arch_mem_init - initialize memory management subsystem
 438  *
 439  *  o plat_mem_setup() detects the memory configuration and will record detected
 440  *    memory areas using add_memory_region.
 441  *
 442  * At this stage the memory configuration of the system is known to the
 443  * kernel but generic memory management system is still entirely uninitialized.
 444  *
 445  *  o bootmem_init()
 446  *  o sparse_init()
 447  *  o paging_init()
 448  *
 449  * At this stage the bootmem allocator is ready to use.
 450  *
 451  * NOTE: historically plat_mem_setup did the entire platform initialization.
 452  *       This was rather impractical because it meant plat_mem_setup had to
 453  * get away without any kind of memory allocator.  To keep old code from
 454  * breaking plat_setup was just renamed to plat_setup and a second platform
 455  * initialization hook for anything else was introduced.
 456  */
 457
 458 static int usermem __initdata;
 459
 460 static int __init early_parse_mem(char *p)
 461 {
 462         unsigned long start, size;
 463
 464         /*
 465          * If a user specifies memory size, we
 466          * blow away any automatically generated
 467          * size.
 468          */
 469         if (usermem == 0) {
 470                 boot_mem_map.nr_map = 0;
 471                 usermem = 1;
 472         }
 473         start = 0;
 474         size = memparse(p, &p);
 475         if (*p == '@')
 476                 start = memparse(p + 1, &p);
 477
 478         add_memory_region(start, size, BOOT_MEM_RAM);
 479         return 0;
 480 }
 481 early_param("mem", early_parse_mem);
 482
 483 static void __init arch_mem_init(char **cmdline_p)
 484 {
 485         phys_t init_mem, init_end, init_size;
 486
 487         extern void plat_mem_setup(void);
 488
 489         /* call board setup routine */
 490         plat_mem_setup();
 491
 492         init_mem = PFN_UP(__pa_symbol(&__init_begin)) << PAGE_SHIFT;
 493         init_end = PFN_DOWN(__pa_symbol(&__init_end)) << PAGE_SHIFT;
 494         init_size = init_end - init_mem;
 495         if (init_size) {
 496                 /* Make sure it is in the boot_mem_map */
 497                 int i, found;
 498                 found = 0;
 499                 for (i = 0; i < boot_mem_map.nr_map; i++) {
 500                         if (init_mem >= boot_mem_map.map[i].addr &&
 501                             init_mem < (boot_mem_map.map[i].addr +
 502                                         boot_mem_map.map[i].size)) {
 503                                 found = 1;
 504                                 break;
 505                         }
 506                 }
 507                 if (!found)
 508                         add_memory_region(init_mem, init_size,
 509                                           BOOT_MEM_INIT_RAM);
 510         }
 511
 512         pr_info("Determined physical RAM map:\n");
 513         print_memory_map();
 514
 515 #ifdef CONFIG_CMDLINE_BOOL
 516 #ifdef CONFIG_CMDLINE_OVERRIDE
 517         strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 518 #else
 519         if (builtin_cmdline[0]) {
 520                 strlcat(arcs_cmdline, " ", COMMAND_LINE_SIZE);
 521                 strlcat(arcs_cmdline, builtin_cmdline, COMMAND_LINE_SIZE);
 522         }
 523         strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
 524 #endif
 525 #else
 526         strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
 527 #endif
 528         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 529
 530         *cmdline_p = command_line;
 531
 532         parse_early_param();
 533
 534         if (usermem) {
 535                 pr_info("User-defined physical RAM map:\n");
 536                 print_memory_map();
 537         }
 538
 539         bootmem_init();
 540 #ifdef CONFIG_KEXEC
 541         if (crashk_res.start != crashk_res.end)
 542                 reserve_bootmem(crashk_res.start,
 543                                 crashk_res.end - crashk_res.start + 1,
 544                                 BOOTMEM_DEFAULT);
 545 #endif
 546         device_tree_init();
 547         sparse_init();
 548         plat_swiotlb_setup();
 549         paging_init();
 550 }
 551
 552 #ifdef CONFIG_KEXEC
 553 static inline unsigned long long get_total_mem(void)
 554 {
 555         unsigned long long total;
 556
 557         total = max_pfn - min_low_pfn;
 558         return total << PAGE_SHIFT;
 559 }
 560
 561 static void __init mips_parse_crashkernel(void)
 562 {
 563         unsigned long long total_mem;
 564         unsigned long long crash_size, crash_base;
 565         int ret;
 566
 567         total_mem = get_total_mem();
 568         ret = parse_crashkernel(boot_command_line, total_mem,
 569                                 &crash_size, &crash_base);
 570         if (ret != 0 || crash_size <= 0)
 571                 return;
 572
 573         crashk_res.start = crash_base;
 574         crashk_res.end   = crash_base + crash_size - 1;
 575 }
 576
 577 static void __init request_crashkernel(struct resource *res)
 578 {
 579         int ret;
 580
 581         ret = request_resource(res, &crashk_res);
 582         if (!ret)
 583                 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
 584                         (unsigned long)((crashk_res.end -
 585                                 crashk_res.start + 1) >> 20),
 586                         (unsigned long)(crashk_res.start  >> 20));
 587 }
 588 #else /* !defined(CONFIG_KEXEC)  */
 589 static void __init mips_parse_crashkernel(void)
 590 {
 591 }
 592
 593 static void __init request_crashkernel(struct resource *res)
 594 {
 595 }
 596 #endif /* !defined(CONFIG_KEXEC)  */
 597
 598 static void __init resource_init(void)
 599 {
 600         int i;
 601
 602         if (UNCAC_BASE != IO_BASE)
 603                 return;
 604
 605         code_resource.start = __pa_symbol(&_text);
 606         code_resource.end = __pa_symbol(&_etext) - 1;
 607         data_resource.start = __pa_symbol(&_etext);
 608         data_resource.end = __pa_symbol(&_edata) - 1;
 609
 610         /*
 611          * Request address space for all standard RAM.
 612          */
 613         mips_parse_crashkernel();
 614
 615         for (i = 0; i < boot_mem_map.nr_map; i++) {
 616                 struct resource *res;
 617                 unsigned long start, end;
 618
 619                 start = boot_mem_map.map[i].addr;
 620                 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
 621                 if (start >= HIGHMEM_START)
 622                         continue;
 623                 if (end >= HIGHMEM_START)
 624                         end = HIGHMEM_START - 1;
 625
 626                 res = alloc_bootmem(sizeof(struct resource));
 627                 switch (boot_mem_map.map[i].type) {
 628                 case BOOT_MEM_RAM:
 629                 case BOOT_MEM_INIT_RAM:
 630                 case BOOT_MEM_ROM_DATA:
 631                         res->name = "System RAM";
 632                         break;
 633                 case BOOT_MEM_RESERVED:
 634                 default:
 635                         res->name = "reserved";
 636                 }
 637
 638                 res->start = start;
 639                 res->end = end;
 640
 641                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 642                 request_resource(&iomem_resource, res);
 643
 644                 /*
 645                  *  We don't know which RAM region contains kernel data,
 646                  *  so we try it repeatedly and let the resource manager
 647                  *  test it.
 648                  */
 649                 request_resource(res, &code_resource);
 650                 request_resource(res, &data_resource);
 651                 request_crashkernel(res);
 652         }
 653 }
 654
 655 void __init setup_arch(char **cmdline_p)
 656 {
 657         cpu_probe();
 658         prom_init();
 659
 660 #ifdef CONFIG_EARLY_PRINTK
 661         setup_early_printk();
 662 #endif
 663         cpu_report();
 664         check_bugs_early();
 665
 666 #if defined(CONFIG_VT)
 667 #if defined(CONFIG_VGA_CONSOLE)
 668         conswitchp = &vga_con;
 669 #elif defined(CONFIG_DUMMY_CONSOLE)
 670         conswitchp = &dummy_con;
 671 #endif
 672 #endif
 673
 674         arch_mem_init(cmdline_p);
 675
 676         resource_init();
 677         plat_smp_setup();
 678
 679         cpu_cache_init();
 680 }
 681
 682 unsigned long kernelsp[NR_CPUS];
 683 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
 684
 685 #ifdef CONFIG_DEBUG_FS
 686 struct dentry *mips_debugfs_dir;
 687 static int __init debugfs_mips(void)
 688 {
 689         struct dentry *d;
 690
 691         d = debugfs_create_dir("mips", NULL);
 692         if (!d)
 693                 return -ENOMEM;
 694         mips_debugfs_dir = d;
 695         return 0;
 696 }
 697 arch_initcall(debugfs_mips);
 698 #endif