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 /*
  72  * isa_slot_offset is the address where E(ISA) busaddress 0 is mapped
  73  * for the processor.
  74  */
  75 unsigned long isa_slot_offset;
  76 EXPORT_SYMBOL(isa_slot_offset);
  77
  78 static struct resource code_resource = { .name = "Kernel code", };
  79 static struct resource data_resource = { .name = "Kernel data", };
  80
  81 void __init add_memory_region(phys_t start, phys_t size, long type)
  82 {
  83         int x = boot_mem_map.nr_map;
  84         struct boot_mem_map_entry *prev = boot_mem_map.map + x - 1;
  85
  86         /* Sanity check */
  87         if (start + size < start) {
  88                 printk("Trying to add an invalid memory region, skipped\n");
  89                 return;
  90         }
  91
  92         /*
  93          * Try to merge with previous entry if any.  This is far less than
  94          * perfect but is sufficient for most real world cases.
  95          */
  96         if (x && prev->addr + prev->size == start && prev->type == type) {
  97                 prev->size += size;
  98                 return;
  99         }
 100
 101         if (x == BOOT_MEM_MAP_MAX) {
 102                 printk("Ooops! Too many entries in the memory map!\n");
 103                 return;
 104         }
 105
 106         boot_mem_map.map[x].addr = start;
 107         boot_mem_map.map[x].size = size;
 108         boot_mem_map.map[x].type = type;
 109         boot_mem_map.nr_map++;
 110 }
 111
 112 static void __init print_memory_map(void)
 113 {
 114         int i;
 115         const int field = 2 * sizeof(unsigned long);
 116
 117         for (i = 0; i < boot_mem_map.nr_map; i++) {
 118                 printk(" memory: %0*Lx @ %0*Lx ",
 119                        field, (unsigned long long) boot_mem_map.map[i].size,
 120                        field, (unsigned long long) boot_mem_map.map[i].addr);
 121
 122                 switch (boot_mem_map.map[i].type) {
 123                 case BOOT_MEM_RAM:
 124                         printk("(usable)\n");
 125                         break;
 126                 case BOOT_MEM_ROM_DATA:
 127                         printk("(ROM data)\n");
 128                         break;
 129                 case BOOT_MEM_RESERVED:
 130                         printk("(reserved)\n");
 131                         break;
 132                 default:
 133                         printk("type %lu\n", boot_mem_map.map[i].type);
 134                         break;
 135                 }
 136         }
 137 }
 138
 139 /*
 140  * Manage initrd
 141  */
 142 #ifdef CONFIG_BLK_DEV_INITRD
 143
 144 static int __init rd_start_early(char *p)
 145 {
 146         unsigned long start = memparse(p, &p);
 147
 148 #ifdef CONFIG_64BIT
 149         /* Guess if the sign extension was forgotten by bootloader */
 150         if (start < XKPHYS)
 151                 start = (int)start;
 152 #endif
 153         initrd_start = start;
 154         initrd_end += start;
 155         return 0;
 156 }
 157 early_param("rd_start", rd_start_early);
 158
 159 static int __init rd_size_early(char *p)
 160 {
 161         initrd_end += memparse(p, &p);
 162         return 0;
 163 }
 164 early_param("rd_size", rd_size_early);
 165
 166 /* it returns the next free pfn after initrd */
 167 static unsigned long __init init_initrd(void)
 168 {
 169         unsigned long end;
 170         u32 *initrd_header;
 171
 172         /*
 173          * Board specific code or command line parser should have
 174          * already set up initrd_start and initrd_end. In these cases
 175          * perfom sanity checks and use them if all looks good.
 176          */
 177         if (initrd_start && initrd_end > initrd_start)
 178                 goto sanitize;
 179
 180         /*
 181          * See if initrd has been added to the kernel image by
 182          * arch/mips/boot/addinitrd.c. In that case a header is
 183          * prepended to initrd and is made up by 8 bytes. The fisrt
 184          * word is a magic number and the second one is the size of
 185          * initrd.  Initrd start must be page aligned in any cases.
 186          */
 187         initrd_header = __va(PAGE_ALIGN(__pa_symbol(&_end) + 8)) - 8;
 188         if (initrd_header[0] != 0x494E5244)
 189                 goto disable;
 190         initrd_start = (unsigned long)(initrd_header + 2);
 191         initrd_end = initrd_start + initrd_header[1];
 192
 193 sanitize:
 194         if (initrd_start & ~PAGE_MASK) {
 195                 printk(KERN_ERR "initrd start must be page aligned\n");
 196                 goto disable;
 197         }
 198         if (initrd_start < PAGE_OFFSET) {
 199                 printk(KERN_ERR "initrd start < PAGE_OFFSET\n");
 200                 goto disable;
 201         }
 202
 203         /*
 204          * Sanitize initrd addresses. For example firmware
 205          * can't guess if they need to pass them through
 206          * 64-bits values if the kernel has been built in pure
 207          * 32-bit. We need also to switch from KSEG0 to XKPHYS
 208          * addresses now, so the code can now safely use __pa().
 209          */
 210         end = __pa(initrd_end);
 211         initrd_end = (unsigned long)__va(end);
 212         initrd_start = (unsigned long)__va(__pa(initrd_start));
 213
 214         ROOT_DEV = Root_RAM0;
 215         return PFN_UP(end);
 216 disable:
 217         initrd_start = 0;
 218         initrd_end = 0;
 219         return 0;
 220 }
 221
 222 static void __init finalize_initrd(void)
 223 {
 224         unsigned long size = initrd_end - initrd_start;
 225
 226         if (size == 0) {
 227                 printk(KERN_INFO "Initrd not found or empty");
 228                 goto disable;
 229         }
 230         if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
 231                 printk("Initrd extends beyond end of memory");
 232                 goto disable;
 233         }
 234
 235         reserve_bootmem(__pa(initrd_start), size, BOOTMEM_DEFAULT);
 236         initrd_below_start_ok = 1;
 237
 238         printk(KERN_INFO "Initial ramdisk at: 0x%lx (%lu bytes)\n",
 239                initrd_start, size);
 240         return;
 241 disable:
 242         printk(" - disabling initrd\n");
 243         initrd_start = 0;
 244         initrd_end = 0;
 245 }
 246
 247 #else  /* !CONFIG_BLK_DEV_INITRD */
 248
 249 static unsigned long __init init_initrd(void)
 250 {
 251         return 0;
 252 }
 253
 254 #define finalize_initrd()       do {} while (0)
 255
 256 #endif
 257
 258 /*
 259  * Initialize the bootmem allocator. It also setup initrd related data
 260  * if needed.
 261  */
 262 #ifdef CONFIG_SGI_IP27
 263
 264 static void __init bootmem_init(void)
 265 {
 266         init_initrd();
 267         finalize_initrd();
 268 }
 269
 270 #else  /* !CONFIG_SGI_IP27 */
 271
 272 static void __init bootmem_init(void)
 273 {
 274         unsigned long reserved_end;
 275         unsigned long mapstart = ~0UL;
 276         unsigned long bootmap_size;
 277         int i;
 278
 279         /*
 280          * Init any data related to initrd. It's a nop if INITRD is
 281          * not selected. Once that done we can determine the low bound
 282          * of usable memory.
 283          */
 284         reserved_end = max(init_initrd(), PFN_UP(__pa_symbol(&_end)));
 285
 286         /*
 287          * max_low_pfn is not a number of pages. The number of pages
 288          * of the system is given by 'max_low_pfn - min_low_pfn'.
 289          */
 290         min_low_pfn = ~0UL;
 291         max_low_pfn = 0;
 292
 293         /*
 294          * Find the highest page frame number we have available.
 295          */
 296         for (i = 0; i < boot_mem_map.nr_map; i++) {
 297                 unsigned long start, end;
 298
 299                 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
 300                         continue;
 301
 302                 start = PFN_UP(boot_mem_map.map[i].addr);
 303                 end = PFN_DOWN(boot_mem_map.map[i].addr
 304                                 + boot_mem_map.map[i].size);
 305
 306                 if (end > max_low_pfn)
 307                         max_low_pfn = end;
 308                 if (start < min_low_pfn)
 309                         min_low_pfn = start;
 310                 if (end <= reserved_end)
 311                         continue;
 312                 if (start >= mapstart)
 313                         continue;
 314                 mapstart = max(reserved_end, start);
 315         }
 316
 317         if (min_low_pfn >= max_low_pfn)
 318                 panic("Incorrect memory mapping !!!");
 319         if (min_low_pfn > ARCH_PFN_OFFSET) {
 320                 printk(KERN_INFO
 321                        "Wasting %lu bytes for tracking %lu unused pages\n",
 322                        (min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page),
 323                        min_low_pfn - ARCH_PFN_OFFSET);
 324         } else if (min_low_pfn < ARCH_PFN_OFFSET) {
 325                 printk(KERN_INFO
 326                        "%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                 add_active_range(0, start, end);
 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                 /*
 383                  * Reserve usable memory.
 384                  */
 385                 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
 386                         continue;
 387
 388                 start = PFN_UP(boot_mem_map.map[i].addr);
 389                 end   = PFN_DOWN(boot_mem_map.map[i].addr
 390                                     + boot_mem_map.map[i].size);
 391                 /*
 392                  * We are rounding up the start address of usable memory
 393                  * and at the end of the usable range downwards.
 394                  */
 395                 if (start >= max_low_pfn)
 396                         continue;
 397                 if (start < reserved_end)
 398                         start = reserved_end;
 399                 if (end > max_low_pfn)
 400                         end = max_low_pfn;
 401
 402                 /*
 403                  * ... finally, is the area going away?
 404                  */
 405                 if (end <= start)
 406                         continue;
 407                 size = end - start;
 408
 409                 /* Register lowmem ranges */
 410                 free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
 411                 memory_present(0, start, end);
 412         }
 413
 414         /*
 415          * Reserve the bootmap memory.
 416          */
 417         reserve_bootmem(PFN_PHYS(mapstart), bootmap_size, BOOTMEM_DEFAULT);
 418
 419         /*
 420          * Reserve initrd memory if needed.
 421          */
 422         finalize_initrd();
 423 }
 424
 425 #endif  /* CONFIG_SGI_IP27 */
 426
 427 /*
 428  * arch_mem_init - initialize memory management subsystem
 429  *
 430  *  o plat_mem_setup() detects the memory configuration and will record detected
 431  *    memory areas using add_memory_region.
 432  *
 433  * At this stage the memory configuration of the system is known to the
 434  * kernel but generic memory management system is still entirely uninitialized.
 435  *
 436  *  o bootmem_init()
 437  *  o sparse_init()
 438  *  o paging_init()
 439  *
 440  * At this stage the bootmem allocator is ready to use.
 441  *
 442  * NOTE: historically plat_mem_setup did the entire platform initialization.
 443  *       This was rather impractical because it meant plat_mem_setup had to
 444  * get away without any kind of memory allocator.  To keep old code from
 445  * breaking plat_setup was just renamed to plat_setup and a second platform
 446  * initialization hook for anything else was introduced.
 447  */
 448
 449 static int usermem __initdata = 0;
 450
 451 static int __init early_parse_mem(char *p)
 452 {
 453         unsigned long start, size;
 454
 455         /*
 456          * If a user specifies memory size, we
 457          * blow away any automatically generated
 458          * size.
 459          */
 460         if (usermem == 0) {
 461                 boot_mem_map.nr_map = 0;
 462                 usermem = 1;
 463         }
 464         start = 0;
 465         size = memparse(p, &p);
 466         if (*p == '@')
 467                 start = memparse(p + 1, &p);
 468
 469         add_memory_region(start, size, BOOT_MEM_RAM);
 470         return 0;
 471 }
 472 early_param("mem", early_parse_mem);
 473
 474 static void __init arch_mem_init(char **cmdline_p)
 475 {
 476         extern void plat_mem_setup(void);
 477
 478         /* call board setup routine */
 479         plat_mem_setup();
 480
 481         printk("Determined physical RAM map:\n");
 482         print_memory_map();
 483
 484         strlcpy(command_line, arcs_cmdline, sizeof(command_line));
 485         strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 486
 487         *cmdline_p = command_line;
 488
 489         parse_early_param();
 490
 491         if (usermem) {
 492                 printk("User-defined physical RAM map:\n");
 493                 print_memory_map();
 494         }
 495
 496         bootmem_init();
 497         sparse_init();
 498         paging_init();
 499 }
 500
 501 static void __init resource_init(void)
 502 {
 503         int i;
 504
 505         if (UNCAC_BASE != IO_BASE)
 506                 return;
 507
 508         code_resource.start = __pa_symbol(&_text);
 509         code_resource.end = __pa_symbol(&_etext) - 1;
 510         data_resource.start = __pa_symbol(&_etext);
 511         data_resource.end = __pa_symbol(&_edata) - 1;
 512
 513         /*
 514          * Request address space for all standard RAM.
 515          */
 516         for (i = 0; i < boot_mem_map.nr_map; i++) {
 517                 struct resource *res;
 518                 unsigned long start, end;
 519
 520                 start = boot_mem_map.map[i].addr;
 521                 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
 522                 if (start >= HIGHMEM_START)
 523                         continue;
 524                 if (end >= HIGHMEM_START)
 525                         end = HIGHMEM_START - 1;
 526
 527                 res = alloc_bootmem(sizeof(struct resource));
 528                 switch (boot_mem_map.map[i].type) {
 529                 case BOOT_MEM_RAM:
 530                 case BOOT_MEM_ROM_DATA:
 531                         res->name = "System RAM";
 532                         break;
 533                 case BOOT_MEM_RESERVED:
 534                 default:
 535                         res->name = "reserved";
 536                 }
 537
 538                 res->start = start;
 539                 res->end = end;
 540
 541                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 542                 request_resource(&iomem_resource, res);
 543
 544                 /*
 545                  *  We don't know which RAM region contains kernel data,
 546                  *  so we try it repeatedly and let the resource manager
 547                  *  test it.
 548                  */
 549                 request_resource(res, &code_resource);
 550                 request_resource(res, &data_resource);
 551         }
 552 }
 553
 554 void __init setup_arch(char **cmdline_p)
 555 {
 556         cpu_probe();
 557         prom_init();
 558
 559 #ifdef CONFIG_EARLY_PRINTK
 560         {
 561                 extern void setup_early_printk(void);
 562
 563                 setup_early_printk();
 564         }
 565 #endif
 566         cpu_report();
 567         check_bugs_early();
 568
 569 #if defined(CONFIG_VT)
 570 #if defined(CONFIG_VGA_CONSOLE)
 571         conswitchp = &vga_con;
 572 #elif defined(CONFIG_DUMMY_CONSOLE)
 573         conswitchp = &dummy_con;
 574 #endif
 575 #endif
 576
 577         arch_mem_init(cmdline_p);
 578
 579         resource_init();
 580         plat_smp_setup();
 581 }
 582
 583 static int __init fpu_disable(char *s)
 584 {
 585         int i;
 586
 587         for (i = 0; i < NR_CPUS; i++)
 588                 cpu_data[i].options &= ~MIPS_CPU_FPU;
 589
 590         return 1;
 591 }
 592
 593 __setup("nofpu", fpu_disable);
 594
 595 static int __init dsp_disable(char *s)
 596 {
 597         cpu_data[0].ases &= ~MIPS_ASE_DSP;
 598
 599         return 1;
 600 }
 601
 602 __setup("nodsp", dsp_disable);
 603
 604 unsigned long kernelsp[NR_CPUS];
 605 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
 606
 607 #ifdef CONFIG_DEBUG_FS
 608 struct dentry *mips_debugfs_dir;
 609 static int __init debugfs_mips(void)
 610 {
 611         struct dentry *d;
 612
 613         d = debugfs_create_dir("mips", NULL);
 614         if (IS_ERR(d))
 615                 return PTR_ERR(d);
 616         mips_debugfs_dir = d;
 617         return 0;
 618 }
 619 arch_initcall(debugfs_mips);
 620 #endif