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