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(),
 281                            (unsigned long) PFN_UP(__pa_symbol(&_end)));
 282
 283         /*
 284          * max_low_pfn is not a number of pages. The number of pages
 285          * of the system is given by 'max_low_pfn - min_low_pfn'.
 286          */
 287         min_low_pfn = ~0UL;
 288         max_low_pfn = 0;
 289
 290         /*
 291          * Find the highest page frame number we have available.
 292          */
 293         for (i = 0; i < boot_mem_map.nr_map; i++) {
 294                 unsigned long start, end;
 295
 296                 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
 297                         continue;
 298
 299                 start = PFN_UP(boot_mem_map.map[i].addr);
 300                 end = PFN_DOWN(boot_mem_map.map[i].addr
 301                                 + boot_mem_map.map[i].size);
 302
 303                 if (end > max_low_pfn)
 304                         max_low_pfn = end;
 305                 if (start < min_low_pfn)
 306                         min_low_pfn = start;
 307                 if (end <= reserved_end)
 308                         continue;
 309                 if (start >= mapstart)
 310                         continue;
 311                 mapstart = max(reserved_end, start);
 312         }
 313
 314         if (min_low_pfn >= max_low_pfn)
 315                 panic("Incorrect memory mapping !!!");
 316         if (min_low_pfn > ARCH_PFN_OFFSET) {
 317                 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
 318                         (min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page),
 319                         min_low_pfn - ARCH_PFN_OFFSET);
 320         } else if (min_low_pfn < ARCH_PFN_OFFSET) {
 321                 pr_info("%lu free pages won't be used\n",
 322                         ARCH_PFN_OFFSET - min_low_pfn);
 323         }
 324         min_low_pfn = ARCH_PFN_OFFSET;
 325
 326         /*
 327          * Determine low and high memory ranges
 328          */
 329         max_pfn = max_low_pfn;
 330         if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) {
 331 #ifdef CONFIG_HIGHMEM
 332                 highstart_pfn = PFN_DOWN(HIGHMEM_START);
 333                 highend_pfn = max_low_pfn;
 334 #endif
 335                 max_low_pfn = PFN_DOWN(HIGHMEM_START);
 336         }
 337
 338         /*
 339          * Initialize the boot-time allocator with low memory only.
 340          */
 341         bootmap_size = init_bootmem_node(NODE_DATA(0), mapstart,
 342                                          min_low_pfn, max_low_pfn);
 343
 344
 345         for (i = 0; i < boot_mem_map.nr_map; i++) {
 346                 unsigned long start, end;
 347
 348                 start = PFN_UP(boot_mem_map.map[i].addr);
 349                 end = PFN_DOWN(boot_mem_map.map[i].addr
 350                                 + boot_mem_map.map[i].size);
 351
 352                 if (start <= min_low_pfn)
 353                         start = min_low_pfn;
 354                 if (start >= end)
 355                         continue;
 356
 357 #ifndef CONFIG_HIGHMEM
 358                 if (end > max_low_pfn)
 359                         end = max_low_pfn;
 360
 361                 /*
 362                  * ... finally, is the area going away?
 363                  */
 364                 if (end <= start)
 365                         continue;
 366 #endif
 367
 368                 add_active_range(0, start, end);
 369         }
 370
 371         /*
 372          * Register fully available low RAM pages with the bootmem allocator.
 373          */
 374         for (i = 0; i < boot_mem_map.nr_map; i++) {
 375                 unsigned long start, end, size;
 376
 377                 /*
 378                  * Reserve usable memory.
 379                  */
 380                 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
 381                         continue;
 382
 383                 start = PFN_UP(boot_mem_map.map[i].addr);
 384                 end   = PFN_DOWN(boot_mem_map.map[i].addr
 385                                     + boot_mem_map.map[i].size);
 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         extern void plat_mem_setup(void);
 472
 473         /* call board setup routine */
 474         plat_mem_setup();
 475
 476         pr_info("Determined physical RAM map:\n");
 477         print_memory_map();
 478
 479         strlcpy(command_line, arcs_cmdline, sizeof(command_line));
 480         strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 481
 482         *cmdline_p = command_line;
 483
 484         parse_early_param();
 485
 486         if (usermem) {
 487                 pr_info("User-defined physical RAM map:\n");
 488                 print_memory_map();
 489         }
 490
 491         bootmem_init();
 492         sparse_init();
 493         paging_init();
 494 }
 495
 496 static void __init resource_init(void)
 497 {
 498         int i;
 499
 500         if (UNCAC_BASE != IO_BASE)
 501                 return;
 502
 503         code_resource.start = __pa_symbol(&_text);
 504         code_resource.end = __pa_symbol(&_etext) - 1;
 505         data_resource.start = __pa_symbol(&_etext);
 506         data_resource.end = __pa_symbol(&_edata) - 1;
 507
 508         /*
 509          * Request address space for all standard RAM.
 510          */
 511         for (i = 0; i < boot_mem_map.nr_map; i++) {
 512                 struct resource *res;
 513                 unsigned long start, end;
 514
 515                 start = boot_mem_map.map[i].addr;
 516                 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
 517                 if (start >= HIGHMEM_START)
 518                         continue;
 519                 if (end >= HIGHMEM_START)
 520                         end = HIGHMEM_START - 1;
 521
 522                 res = alloc_bootmem(sizeof(struct resource));
 523                 switch (boot_mem_map.map[i].type) {
 524                 case BOOT_MEM_RAM:
 525                 case BOOT_MEM_ROM_DATA:
 526                         res->name = "System RAM";
 527                         break;
 528                 case BOOT_MEM_RESERVED:
 529                 default:
 530                         res->name = "reserved";
 531                 }
 532
 533                 res->start = start;
 534                 res->end = end;
 535
 536                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 537                 request_resource(&iomem_resource, res);
 538
 539                 /*
 540                  *  We don't know which RAM region contains kernel data,
 541                  *  so we try it repeatedly and let the resource manager
 542                  *  test it.
 543                  */
 544                 request_resource(res, &code_resource);
 545                 request_resource(res, &data_resource);
 546         }
 547 }
 548
 549 void __init setup_arch(char **cmdline_p)
 550 {
 551         cpu_probe();
 552         prom_init();
 553
 554 #ifdef CONFIG_EARLY_PRINTK
 555         setup_early_printk();
 556 #endif
 557         cpu_report();
 558         check_bugs_early();
 559
 560 #if defined(CONFIG_VT)
 561 #if defined(CONFIG_VGA_CONSOLE)
 562         conswitchp = &vga_con;
 563 #elif defined(CONFIG_DUMMY_CONSOLE)
 564         conswitchp = &dummy_con;
 565 #endif
 566 #endif
 567
 568         arch_mem_init(cmdline_p);
 569
 570         resource_init();
 571         plat_smp_setup();
 572 }
 573
 574 static int __init fpu_disable(char *s)
 575 {
 576         int i;
 577
 578         for (i = 0; i < NR_CPUS; i++)
 579                 cpu_data[i].options &= ~MIPS_CPU_FPU;
 580
 581         return 1;
 582 }
 583
 584 __setup("nofpu", fpu_disable);
 585
 586 static int __init dsp_disable(char *s)
 587 {
 588         cpu_data[0].ases &= ~MIPS_ASE_DSP;
 589
 590         return 1;
 591 }
 592
 593 __setup("nodsp", dsp_disable);
 594
 595 unsigned long kernelsp[NR_CPUS];
 596 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
 597
 598 #ifdef CONFIG_DEBUG_FS
 599 struct dentry *mips_debugfs_dir;
 600 static int __init debugfs_mips(void)
 601 {
 602         struct dentry *d;
 603
 604         d = debugfs_create_dir("mips", NULL);
 605         if (!d)
 606                 return -ENOMEM;
 607         mips_debugfs_dir = d;
 608         return 0;
 609 }
 610 arch_initcall(debugfs_mips);
 611 #endif