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  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/cache.h>
  28 #include <asm/cpu.h>
  29 #include <asm/sections.h>
  30 #include <asm/setup.h>
  31 #include <asm/system.h>
  32
  33 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
  34
  35 EXPORT_SYMBOL(cpu_data);
  36
  37 #ifdef CONFIG_VT
  38 struct screen_info screen_info;
  39 #endif
  40
  41 /*
  42  * Despite it's name this variable is even if we don't have PCI
  43  */
  44 unsigned int PCI_DMA_BUS_IS_PHYS;
  45
  46 EXPORT_SYMBOL(PCI_DMA_BUS_IS_PHYS);
  47
  48 /*
  49  * Setup information
  50  *
  51  * These are initialized so they are in the .data section
  52  */
  53 unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
  54
  55 EXPORT_SYMBOL(mips_machtype);
  56
  57 struct boot_mem_map boot_mem_map;
  58
  59 static char command_line[CL_SIZE];
  60        char arcs_cmdline[CL_SIZE]=CONFIG_CMDLINE;
  61
  62 /*
  63  * mips_io_port_base is the begin of the address space to which x86 style
  64  * I/O ports are mapped.
  65  */
  66 const unsigned long mips_io_port_base __read_mostly = -1;
  67 EXPORT_SYMBOL(mips_io_port_base);
  68
  69 /*
  70  * isa_slot_offset is the address where E(ISA) busaddress 0 is mapped
  71  * for the processor.
  72  */
  73 unsigned long isa_slot_offset;
  74 EXPORT_SYMBOL(isa_slot_offset);
  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                 printk("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                 printk("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(" 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("(usable)\n");
 123                         break;
 124                 case BOOT_MEM_ROM_DATA:
 125                         printk("(ROM data)\n");
 126                         break;
 127                 case BOOT_MEM_RESERVED:
 128                         printk("(reserved)\n");
 129                         break;
 130                 default:
 131                         printk("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         u32 *initrd_header;
 169
 170         /*
 171          * Board specific code or command line parser should have
 172          * already set up initrd_start and initrd_end. In these cases
 173          * perfom sanity checks and use them if all looks good.
 174          */
 175         if (initrd_start && initrd_end > initrd_start)
 176                 goto sanitize;
 177
 178         /*
 179          * See if initrd has been added to the kernel image by
 180          * arch/mips/boot/addinitrd.c. In that case a header is
 181          * prepended to initrd and is made up by 8 bytes. The fisrt
 182          * word is a magic number and the second one is the size of
 183          * initrd.  Initrd start must be page aligned in any cases.
 184          */
 185         initrd_header = __va(PAGE_ALIGN(__pa_symbol(&_end) + 8)) - 8;
 186         if (initrd_header[0] != 0x494E5244)
 187                 goto disable;
 188         initrd_start = (unsigned long)(initrd_header + 2);
 189         initrd_end = initrd_start + initrd_header[1];
 190
 191 sanitize:
 192         if (initrd_start & ~PAGE_MASK) {
 193                 printk(KERN_ERR "initrd start must be page aligned\n");
 194                 goto disable;
 195         }
 196         if (initrd_start < PAGE_OFFSET) {
 197                 printk(KERN_ERR "initrd start < PAGE_OFFSET\n");
 198                 goto disable;
 199         }
 200
 201         /*
 202          * Sanitize initrd addresses. For example firmware
 203          * can't guess if they need to pass them through
 204          * 64-bits values if the kernel has been built in pure
 205          * 32-bit. We need also to switch from KSEG0 to XKPHYS
 206          * addresses now, so the code can now safely use __pa().
 207          */
 208         end = __pa(initrd_end);
 209         initrd_end = (unsigned long)__va(end);
 210         initrd_start = (unsigned long)__va(__pa(initrd_start));
 211
 212         ROOT_DEV = Root_RAM0;
 213         return PFN_UP(end);
 214 disable:
 215         initrd_start = 0;
 216         initrd_end = 0;
 217         return 0;
 218 }
 219
 220 static void __init finalize_initrd(void)
 221 {
 222         unsigned long size = initrd_end - initrd_start;
 223
 224         if (size == 0) {
 225                 printk(KERN_INFO "Initrd not found or empty");
 226                 goto disable;
 227         }
 228         if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
 229                 printk("Initrd extends beyond end of memory");
 230                 goto disable;
 231         }
 232
 233         reserve_bootmem(__pa(initrd_start), size);
 234         initrd_below_start_ok = 1;
 235
 236         printk(KERN_INFO "Initial ramdisk at: 0x%lx (%lu bytes)\n",
 237                initrd_start, size);
 238         return;
 239 disable:
 240         printk(" - disabling initrd\n");
 241         initrd_start = 0;
 242         initrd_end = 0;
 243 }
 244
 245 #else  /* !CONFIG_BLK_DEV_INITRD */
 246
 247 static unsigned long __init init_initrd(void)
 248 {
 249         return 0;
 250 }
 251
 252 #define finalize_initrd()       do {} while (0)
 253
 254 #endif
 255
 256 /*
 257  * Initialize the bootmem allocator. It also setup initrd related data
 258  * if needed.
 259  */
 260 #ifdef CONFIG_SGI_IP27
 261
 262 static void __init bootmem_init(void)
 263 {
 264         init_initrd();
 265         finalize_initrd();
 266 }
 267
 268 #else  /* !CONFIG_SGI_IP27 */
 269
 270 static void __init bootmem_init(void)
 271 {
 272         unsigned long reserved_end;
 273         unsigned long mapstart = ~0UL;
 274         unsigned long bootmap_size;
 275         int i;
 276
 277         /*
 278          * Init any data related to initrd. It's a nop if INITRD is
 279          * not selected. Once that done we can determine the low bound
 280          * of usable memory.
 281          */
 282         reserved_end = max(init_initrd(), PFN_UP(__pa_symbol(&_end)));
 283
 284         /*
 285          * max_low_pfn is not a number of pages. The number of pages
 286          * of the system is given by 'max_low_pfn - min_low_pfn'.
 287          */
 288         min_low_pfn = ~0UL;
 289         max_low_pfn = 0;
 290
 291         /*
 292          * Find the highest page frame number we have available.
 293          */
 294         for (i = 0; i < boot_mem_map.nr_map; i++) {
 295                 unsigned long start, end;
 296
 297                 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
 298                         continue;
 299
 300                 start = PFN_UP(boot_mem_map.map[i].addr);
 301                 end = PFN_DOWN(boot_mem_map.map[i].addr
 302                                 + boot_mem_map.map[i].size);
 303
 304                 if (end > max_low_pfn)
 305                         max_low_pfn = end;
 306                 if (start < min_low_pfn)
 307                         min_low_pfn = start;
 308                 if (end <= reserved_end)
 309                         continue;
 310                 if (start >= mapstart)
 311                         continue;
 312                 mapstart = max(reserved_end, start);
 313         }
 314
 315         if (min_low_pfn >= max_low_pfn)
 316                 panic("Incorrect memory mapping !!!");
 317         if (min_low_pfn > ARCH_PFN_OFFSET) {
 318                 printk(KERN_INFO
 319                        "Wasting %lu bytes for tracking %lu unused pages\n",
 320                        (min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page),
 321                        min_low_pfn - ARCH_PFN_OFFSET);
 322         } else if (min_low_pfn < ARCH_PFN_OFFSET) {
 323                 printk(KERN_INFO
 324                        "%lu free pages won't be used\n",
 325                        ARCH_PFN_OFFSET - min_low_pfn);
 326         }
 327         min_low_pfn = ARCH_PFN_OFFSET;
 328
 329         /*
 330          * Determine low and high memory ranges
 331          */
 332         if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) {
 333 #ifdef CONFIG_HIGHMEM
 334                 highstart_pfn = PFN_DOWN(HIGHMEM_START);
 335                 highend_pfn = max_low_pfn;
 336 #endif
 337                 max_low_pfn = PFN_DOWN(HIGHMEM_START);
 338         }
 339
 340         /*
 341          * Initialize the boot-time allocator with low memory only.
 342          */
 343         bootmap_size = init_bootmem_node(NODE_DATA(0), mapstart,
 344                                          min_low_pfn, max_low_pfn);
 345         /*
 346          * Register fully available low RAM pages with the bootmem allocator.
 347          */
 348         for (i = 0; i < boot_mem_map.nr_map; i++) {
 349                 unsigned long start, end, size;
 350
 351                 /*
 352                  * Reserve usable memory.
 353                  */
 354                 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
 355                         continue;
 356
 357                 start = PFN_UP(boot_mem_map.map[i].addr);
 358                 end   = PFN_DOWN(boot_mem_map.map[i].addr
 359                                     + boot_mem_map.map[i].size);
 360                 /*
 361                  * We are rounding up the start address of usable memory
 362                  * and at the end of the usable range downwards.
 363                  */
 364                 if (start >= max_low_pfn)
 365                         continue;
 366                 if (start < reserved_end)
 367                         start = reserved_end;
 368                 if (end > max_low_pfn)
 369                         end = max_low_pfn;
 370
 371                 /*
 372                  * ... finally, is the area going away?
 373                  */
 374                 if (end <= start)
 375                         continue;
 376                 size = end - start;
 377
 378                 /* Register lowmem ranges */
 379                 free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
 380                 memory_present(0, start, end);
 381         }
 382
 383         /*
 384          * Reserve the bootmap memory.
 385          */
 386         reserve_bootmem(PFN_PHYS(mapstart), bootmap_size);
 387
 388         /*
 389          * Reserve initrd memory if needed.
 390          */
 391         finalize_initrd();
 392 }
 393
 394 #endif  /* CONFIG_SGI_IP27 */
 395
 396 /*
 397  * arch_mem_init - initialize memory managment subsystem
 398  *
 399  *  o plat_mem_setup() detects the memory configuration and will record detected
 400  *    memory areas using add_memory_region.
 401  *
 402  * At this stage the memory configuration of the system is known to the
 403  * kernel but generic memory managment system is still entirely uninitialized.
 404  *
 405  *  o bootmem_init()
 406  *  o sparse_init()
 407  *  o paging_init()
 408  *
 409  * At this stage the bootmem allocator is ready to use.
 410  *
 411  * NOTE: historically plat_mem_setup did the entire platform initialization.
 412  *       This was rather impractical because it meant plat_mem_setup had to
 413  * get away without any kind of memory allocator.  To keep old code from
 414  * breaking plat_setup was just renamed to plat_setup and a second platform
 415  * initialization hook for anything else was introduced.
 416  */
 417
 418 static int usermem __initdata = 0;
 419
 420 static int __init early_parse_mem(char *p)
 421 {
 422         unsigned long start, size;
 423
 424         /*
 425          * If a user specifies memory size, we
 426          * blow away any automatically generated
 427          * size.
 428          */
 429         if (usermem == 0) {
 430                 boot_mem_map.nr_map = 0;
 431                 usermem = 1;
 432         }
 433         start = 0;
 434         size = memparse(p, &p);
 435         if (*p == '@')
 436                 start = memparse(p + 1, &p);
 437
 438         add_memory_region(start, size, BOOT_MEM_RAM);
 439         return 0;
 440 }
 441 early_param("mem", early_parse_mem);
 442
 443 static void __init arch_mem_init(char **cmdline_p)
 444 {
 445         extern void plat_mem_setup(void);
 446
 447         /* call board setup routine */
 448         plat_mem_setup();
 449
 450         printk("Determined physical RAM map:\n");
 451         print_memory_map();
 452
 453         strlcpy(command_line, arcs_cmdline, sizeof(command_line));
 454         strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 455
 456         *cmdline_p = command_line;
 457
 458         parse_early_param();
 459
 460         if (usermem) {
 461                 printk("User-defined physical RAM map:\n");
 462                 print_memory_map();
 463         }
 464
 465         bootmem_init();
 466         sparse_init();
 467         paging_init();
 468 }
 469
 470 static void __init resource_init(void)
 471 {
 472         int i;
 473
 474         if (UNCAC_BASE != IO_BASE)
 475                 return;
 476
 477         code_resource.start = __pa_symbol(&_text);
 478         code_resource.end = __pa_symbol(&_etext) - 1;
 479         data_resource.start = __pa_symbol(&_etext);
 480         data_resource.end = __pa_symbol(&_edata) - 1;
 481
 482         /*
 483          * Request address space for all standard RAM.
 484          */
 485         for (i = 0; i < boot_mem_map.nr_map; i++) {
 486                 struct resource *res;
 487                 unsigned long start, end;
 488
 489                 start = boot_mem_map.map[i].addr;
 490                 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
 491                 if (start >= HIGHMEM_START)
 492                         continue;
 493                 if (end >= HIGHMEM_START)
 494                         end = HIGHMEM_START - 1;
 495
 496                 res = alloc_bootmem(sizeof(struct resource));
 497                 switch (boot_mem_map.map[i].type) {
 498                 case BOOT_MEM_RAM:
 499                 case BOOT_MEM_ROM_DATA:
 500                         res->name = "System RAM";
 501                         break;
 502                 case BOOT_MEM_RESERVED:
 503                 default:
 504                         res->name = "reserved";
 505                 }
 506
 507                 res->start = start;
 508                 res->end = end;
 509
 510                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 511                 request_resource(&iomem_resource, res);
 512
 513                 /*
 514                  *  We don't know which RAM region contains kernel data,
 515                  *  so we try it repeatedly and let the resource manager
 516                  *  test it.
 517                  */
 518                 request_resource(res, &code_resource);
 519                 request_resource(res, &data_resource);
 520         }
 521 }
 522
 523 void __init setup_arch(char **cmdline_p)
 524 {
 525         cpu_probe();
 526         prom_init();
 527
 528 #ifdef CONFIG_EARLY_PRINTK
 529         {
 530                 extern void setup_early_printk(void);
 531
 532                 setup_early_printk();
 533         }
 534 #endif
 535         cpu_report();
 536
 537 #if defined(CONFIG_VT)
 538 #if defined(CONFIG_VGA_CONSOLE)
 539         conswitchp = &vga_con;
 540 #elif defined(CONFIG_DUMMY_CONSOLE)
 541         conswitchp = &dummy_con;
 542 #endif
 543 #endif
 544
 545         arch_mem_init(cmdline_p);
 546
 547         resource_init();
 548 #ifdef CONFIG_SMP
 549         plat_smp_setup();
 550 #endif
 551 }
 552
 553 static int __init fpu_disable(char *s)
 554 {
 555         int i;
 556
 557         for (i = 0; i < NR_CPUS; i++)
 558                 cpu_data[i].options &= ~MIPS_CPU_FPU;
 559
 560         return 1;
 561 }
 562
 563 __setup("nofpu", fpu_disable);
 564
 565 static int __init dsp_disable(char *s)
 566 {
 567         cpu_data[0].ases &= ~MIPS_ASE_DSP;
 568
 569         return 1;
 570 }
 571
 572 __setup("nodsp", dsp_disable);
 573
 574 unsigned long kernelsp[NR_CPUS];
 575 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
 576
 577 #ifdef CONFIG_DEBUG_FS
 578 struct dentry *mips_debugfs_dir;
 579 static int __init debugfs_mips(void)
 580 {
 581         struct dentry *d;
 582
 583         d = debugfs_create_dir("mips", NULL);
 584         if (IS_ERR(d))
 585                 return PTR_ERR(d);
 586         mips_debugfs_dir = d;
 587         return 0;
 588 }
 589 arch_initcall(debugfs_mips);
 590 #endif