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 command_line[CL_SIZE];
  62        char arcs_cmdline[CL_SIZE]=CONFIG_CMDLINE;
  63
  64 /*
  65  * mips_io_port_base is the begin of the address space to which x86 style
  66  * I/O ports are mapped.
  67  */
  68 const unsigned long mips_io_port_base __read_mostly = -1;
  69 EXPORT_SYMBOL(mips_io_port_base);
  70
  71 static struct resource code_resource = { .name = "Kernel code", };
  72 static struct resource data_resource = { .name = "Kernel data", };
  73
  74 void __init add_memory_region(phys_t start, phys_t size, long type)
  75 {
  76         int x = boot_mem_map.nr_map;
  77         struct boot_mem_map_entry *prev = boot_mem_map.map + x - 1;
  78
  79         /* Sanity check */
  80         if (start + size < start) {
  81                 pr_warning("Trying to add an invalid memory region, skipped\n");
  82                 return;
  83         }
  84
  85         /*
  86          * Try to merge with previous entry if any.  This is far less than
  87          * perfect but is sufficient for most real world cases.
  88          */
  89         if (x && prev->addr + prev->size == start && prev->type == type) {
  90                 prev->size += size;
  91                 return;
  92         }
  93
  94         if (x == BOOT_MEM_MAP_MAX) {
  95                 pr_err("Ooops! Too many entries in the memory map!\n");
  96                 return;
  97         }
  98
  99         boot_mem_map.map[x].addr = start;
 100         boot_mem_map.map[x].size = size;
 101         boot_mem_map.map[x].type = type;
 102         boot_mem_map.nr_map++;
 103 }
 104
 105 static void __init print_memory_map(void)
 106 {
 107         int i;
 108         const int field = 2 * sizeof(unsigned long);
 109
 110         for (i = 0; i < boot_mem_map.nr_map; i++) {
 111                 printk(KERN_INFO " memory: %0*Lx @ %0*Lx ",
 112                        field, (unsigned long long) boot_mem_map.map[i].size,
 113                        field, (unsigned long long) boot_mem_map.map[i].addr);
 114
 115                 switch (boot_mem_map.map[i].type) {
 116                 case BOOT_MEM_RAM:
 117                         printk(KERN_CONT "(usable)\n");
 118                         break;
 119                 case BOOT_MEM_ROM_DATA:
 120                         printk(KERN_CONT "(ROM data)\n");
 121                         break;
 122                 case BOOT_MEM_RESERVED:
 123                         printk(KERN_CONT "(reserved)\n");
 124                         break;
 125                 default:
 126                         printk(KERN_CONT "type %lu\n", boot_mem_map.map[i].type);
 127                         break;
 128                 }
 129         }
 130 }
 131
 132 /*
 133  * Manage initrd
 134  */
 135 #ifdef CONFIG_BLK_DEV_INITRD
 136
 137 static int __init rd_start_early(char *p)
 138 {
 139         unsigned long start = memparse(p, &p);
 140
 141 #ifdef CONFIG_64BIT
 142         /* Guess if the sign extension was forgotten by bootloader */
 143         if (start < XKPHYS)
 144                 start = (int)start;
 145 #endif
 146         initrd_start = start;
 147         initrd_end += start;
 148         return 0;
 149 }
 150 early_param("rd_start", rd_start_early);
 151
 152 static int __init rd_size_early(char *p)
 153 {
 154         initrd_end += memparse(p, &p);
 155         return 0;
 156 }
 157 early_param("rd_size", rd_size_early);
 158
 159 /* it returns the next free pfn after initrd */
 160 static unsigned long __init init_initrd(void)
 161 {
 162         unsigned long end;
 163
 164         /*
 165          * Board specific code or command line parser should have
 166          * already set up initrd_start and initrd_end. In these cases
 167          * perfom sanity checks and use them if all looks good.
 168          */
 169         if (!initrd_start || initrd_end <= initrd_start) {
 170 #ifdef CONFIG_PROBE_INITRD_HEADER
 171                 u32 *initrd_header;
 172
 173                 /*
 174                  * See if initrd has been added to the kernel image by
 175                  * arch/mips/boot/addinitrd.c. In that case a header is
 176                  * prepended to initrd and is made up by 8 bytes. The first
 177                  * word is a magic number and the second one is the size of
 178                  * initrd.  Initrd start must be page aligned in any cases.
 179                  */
 180                 initrd_header = __va(PAGE_ALIGN(__pa_symbol(&_end) + 8)) - 8;
 181                 if (initrd_header[0] != 0x494E5244)
 182                         goto disable;
 183                 initrd_start = (unsigned long)(initrd_header + 2);
 184                 initrd_end = initrd_start + initrd_header[1];
 185 #else
 186                 goto disable;
 187 #endif
 188         }
 189
 190         if (initrd_start & ~PAGE_MASK) {
 191                 pr_err("initrd start must be page aligned\n");
 192                 goto disable;
 193         }
 194         if (initrd_start < PAGE_OFFSET) {
 195                 pr_err("initrd start < PAGE_OFFSET\n");
 196                 goto disable;
 197         }
 198
 199         /*
 200          * Sanitize initrd addresses. For example firmware
 201          * can't guess if they need to pass them through
 202          * 64-bits values if the kernel has been built in pure
 203          * 32-bit. We need also to switch from KSEG0 to XKPHYS
 204          * addresses now, so the code can now safely use __pa().
 205          */
 206         end = __pa(initrd_end);
 207         initrd_end = (unsigned long)__va(end);
 208         initrd_start = (unsigned long)__va(__pa(initrd_start));
 209
 210         ROOT_DEV = Root_RAM0;
 211         return PFN_UP(end);
 212 disable:
 213         initrd_start = 0;
 214         initrd_end = 0;
 215         return 0;
 216 }
 217
 218 static void __init finalize_initrd(void)
 219 {
 220         unsigned long size = initrd_end - initrd_start;
 221
 222         if (size == 0) {
 223                 printk(KERN_INFO "Initrd not found or empty");
 224                 goto disable;
 225         }
 226         if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
 227                 printk(KERN_ERR "Initrd extends beyond end of memory");
 228                 goto disable;
 229         }
 230
 231         reserve_bootmem(__pa(initrd_start), size, BOOTMEM_DEFAULT);
 232         initrd_below_start_ok = 1;
 233
 234         pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
 235                 initrd_start, size);
 236         return;
 237 disable:
 238         printk(KERN_CONT " - disabling initrd\n");
 239         initrd_start = 0;
 240         initrd_end = 0;
 241 }
 242
 243 #else  /* !CONFIG_BLK_DEV_INITRD */
 244
 245 static unsigned long __init init_initrd(void)
 246 {
 247         return 0;
 248 }
 249
 250 #define finalize_initrd()       do {} while (0)
 251
 252 #endif
 253
 254 /*
 255  * Initialize the bootmem allocator. It also setup initrd related data
 256  * if needed.
 257  */
 258 #ifdef CONFIG_SGI_IP27
 259
 260 static void __init bootmem_init(void)
 261 {
 262         init_initrd();
 263         finalize_initrd();
 264 }
 265
 266 #else  /* !CONFIG_SGI_IP27 */
 267
 268 static void __init bootmem_init(void)
 269 {
 270         unsigned long reserved_end;
 271         unsigned long mapstart = ~0UL;
 272         unsigned long bootmap_size;
 273         int i;
 274
 275         /*
 276          * Init any data related to initrd. It's a nop if INITRD is
 277          * not selected. Once that done we can determine the low bound
 278          * of usable memory.
 279          */
 280         reserved_end = max(init_initrd(), PFN_UP(__pa_symbol(&_end)));
 281
 282         /*
 283          * max_low_pfn is not a number of pages. The number of pages
 284          * of the system is given by 'max_low_pfn - min_low_pfn'.
 285          */
 286         min_low_pfn = ~0UL;
 287         max_low_pfn = 0;
 288
 289         /*
 290          * Find the highest page frame number we have available.
 291          */
 292         for (i = 0; i < boot_mem_map.nr_map; i++) {
 293                 unsigned long start, end;
 294
 295                 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
 296                         continue;
 297
 298                 start = PFN_UP(boot_mem_map.map[i].addr);
 299                 end = PFN_DOWN(boot_mem_map.map[i].addr
 300                                 + boot_mem_map.map[i].size);
 301
 302                 if (end > max_low_pfn)
 303                         max_low_pfn = end;
 304                 if (start < min_low_pfn)
 305                         min_low_pfn = start;
 306                 if (end <= reserved_end)
 307                         continue;
 308                 if (start >= mapstart)
 309                         continue;
 310                 mapstart = max(reserved_end, start);
 311         }
 312
 313         if (min_low_pfn >= max_low_pfn)
 314                 panic("Incorrect memory mapping !!!");
 315         if (min_low_pfn > ARCH_PFN_OFFSET) {
 316                 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
 317                         (min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page),
 318                         min_low_pfn - ARCH_PFN_OFFSET);
 319         } else if (min_low_pfn < ARCH_PFN_OFFSET) {
 320                 pr_info("%lu free pages won't be used\n",
 321                         ARCH_PFN_OFFSET - min_low_pfn);
 322         }
 323         min_low_pfn = ARCH_PFN_OFFSET;
 324
 325         /*
 326          * Determine low and high memory ranges
 327          */
 328         max_pfn = max_low_pfn;
 329         if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) {
 330 #ifdef CONFIG_HIGHMEM
 331                 highstart_pfn = PFN_DOWN(HIGHMEM_START);
 332                 highend_pfn = max_low_pfn;
 333 #endif
 334                 max_low_pfn = PFN_DOWN(HIGHMEM_START);
 335         }
 336
 337         /*
 338          * Initialize the boot-time allocator with low memory only.
 339          */
 340         bootmap_size = init_bootmem_node(NODE_DATA(0), mapstart,
 341                                          min_low_pfn, max_low_pfn);
 342
 343
 344         for (i = 0; i < boot_mem_map.nr_map; i++) {
 345                 unsigned long start, end;
 346
 347                 start = PFN_UP(boot_mem_map.map[i].addr);
 348                 end = PFN_DOWN(boot_mem_map.map[i].addr
 349                                 + boot_mem_map.map[i].size);
 350
 351                 if (start <= min_low_pfn)
 352                         start = min_low_pfn;
 353                 if (start >= end)
 354                         continue;
 355
 356 #ifndef CONFIG_HIGHMEM
 357                 if (end > max_low_pfn)
 358                         end = max_low_pfn;
 359
 360                 /*
 361                  * ... finally, is the area going away?
 362                  */
 363                 if (end <= start)
 364                         continue;
 365 #endif
 366
 367                 add_active_range(0, start, end);
 368         }
 369
 370         /*
 371          * Register fully available low RAM pages with the bootmem allocator.
 372          */
 373         for (i = 0; i < boot_mem_map.nr_map; i++) {
 374                 unsigned long start, end, size;
 375
 376                 /*
 377                  * Reserve usable memory.
 378                  */
 379                 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
 380                         continue;
 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                  * 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 = 0;
 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         extern void plat_mem_setup(void);
 471
 472         /* call board setup routine */
 473         plat_mem_setup();
 474
 475         pr_info("Determined physical RAM map:\n");
 476         print_memory_map();
 477
 478         strlcpy(command_line, arcs_cmdline, sizeof(command_line));
 479         strlcpy(boot_command_line, 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         sparse_init();
 492         paging_init();
 493 }
 494
 495 static void __init resource_init(void)
 496 {
 497         int i;
 498
 499         if (UNCAC_BASE != IO_BASE)
 500                 return;
 501
 502         code_resource.start = __pa_symbol(&_text);
 503         code_resource.end = __pa_symbol(&_etext) - 1;
 504         data_resource.start = __pa_symbol(&_etext);
 505         data_resource.end = __pa_symbol(&_edata) - 1;
 506
 507         /*
 508          * Request address space for all standard RAM.
 509          */
 510         for (i = 0; i < boot_mem_map.nr_map; i++) {
 511                 struct resource *res;
 512                 unsigned long start, end;
 513
 514                 start = boot_mem_map.map[i].addr;
 515                 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
 516                 if (start >= HIGHMEM_START)
 517                         continue;
 518                 if (end >= HIGHMEM_START)
 519                         end = HIGHMEM_START - 1;
 520
 521                 res = alloc_bootmem(sizeof(struct resource));
 522                 switch (boot_mem_map.map[i].type) {
 523                 case BOOT_MEM_RAM:
 524                 case BOOT_MEM_ROM_DATA:
 525                         res->name = "System RAM";
 526                         break;
 527                 case BOOT_MEM_RESERVED:
 528                 default:
 529                         res->name = "reserved";
 530                 }
 531
 532                 res->start = start;
 533                 res->end = end;
 534
 535                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 536                 request_resource(&iomem_resource, res);
 537
 538                 /*
 539                  *  We don't know which RAM region contains kernel data,
 540                  *  so we try it repeatedly and let the resource manager
 541                  *  test it.
 542                  */
 543                 request_resource(res, &code_resource);
 544                 request_resource(res, &data_resource);
 545         }
 546 }
 547
 548 void __init setup_arch(char **cmdline_p)
 549 {
 550         cpu_probe();
 551         prom_init();
 552
 553 #ifdef CONFIG_EARLY_PRINTK
 554         setup_early_printk();
 555 #endif
 556         cpu_report();
 557         check_bugs_early();
 558
 559 #if defined(CONFIG_VT)
 560 #if defined(CONFIG_VGA_CONSOLE)
 561         conswitchp = &vga_con;
 562 #elif defined(CONFIG_DUMMY_CONSOLE)
 563         conswitchp = &dummy_con;
 564 #endif
 565 #endif
 566
 567         arch_mem_init(cmdline_p);
 568
 569         resource_init();
 570         plat_smp_setup();
 571 }
 572
 573 static int __init fpu_disable(char *s)
 574 {
 575         int i;
 576
 577         for (i = 0; i < NR_CPUS; i++)
 578                 cpu_data[i].options &= ~MIPS_CPU_FPU;
 579
 580         return 1;
 581 }
 582
 583 __setup("nofpu", fpu_disable);
 584
 585 static int __init dsp_disable(char *s)
 586 {
 587         cpu_data[0].ases &= ~MIPS_ASE_DSP;
 588
 589         return 1;
 590 }
 591
 592 __setup("nodsp", dsp_disable);
 593
 594 unsigned long kernelsp[NR_CPUS];
 595 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
 596
 597 #ifdef CONFIG_DEBUG_FS
 598 struct dentry *mips_debugfs_dir;
 599 static int __init debugfs_mips(void)
 600 {
 601         struct dentry *d;
 602
 603         d = debugfs_create_dir("mips", NULL);
 604         if (!d)
 605                 return -ENOMEM;
 606         mips_debugfs_dir = d;
 607         return 0;
 608 }
 609 arch_initcall(debugfs_mips);
 610 #endif