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/export.h> 16 #include <linux/screen_info.h> 17 #include <linux/memblock.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 #include <linux/kexec.h> 25 #include <linux/sizes.h> 26 #include <linux/device.h> 27 #include <linux/dma-contiguous.h> 28 #include <linux/decompress/generic.h> 29 #include <linux/of_fdt.h> 30 #include <linux/of_reserved_mem.h> 31 32 #include <asm/addrspace.h> 33 #include <asm/bootinfo.h> 34 #include <asm/bugs.h> 35 #include <asm/cache.h> 36 #include <asm/cdmm.h> 37 #include <asm/cpu.h> 38 #include <asm/debug.h> 39 #include <asm/dma-coherence.h> 40 #include <asm/sections.h> 41 #include <asm/setup.h> 42 #include <asm/smp-ops.h> 43 #include <asm/prom.h> 44 45 #ifdef CONFIG_MIPS_ELF_APPENDED_DTB 46 const char __section(.appended_dtb) __appended_dtb[0x100000]; 47 #endif /* CONFIG_MIPS_ELF_APPENDED_DTB */ 48 49 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly; 50 51 EXPORT_SYMBOL(cpu_data); 52 53 #ifdef CONFIG_VT 54 struct screen_info screen_info; 55 #endif 56 57 /* 58 * Setup information 59 * 60 * These are initialized so they are in the .data section 61 */ 62 unsigned long mips_machtype __read_mostly = MACH_UNKNOWN; 63 64 EXPORT_SYMBOL(mips_machtype); 65 66 static char __initdata command_line[COMMAND_LINE_SIZE]; 67 char __initdata arcs_cmdline[COMMAND_LINE_SIZE]; 68 69 #ifdef CONFIG_CMDLINE_BOOL 70 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE; 71 #endif 72 73 /* 74 * mips_io_port_base is the begin of the address space to which x86 style 75 * I/O ports are mapped. 76 */ 77 unsigned long mips_io_port_base = -1; 78 EXPORT_SYMBOL(mips_io_port_base); 79 80 static struct resource code_resource = { .name = "Kernel code", }; 81 static struct resource data_resource = { .name = "Kernel data", }; 82 static struct resource bss_resource = { .name = "Kernel bss", }; 83 84 static void *detect_magic __initdata = detect_memory_region; 85 86 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET 87 unsigned long ARCH_PFN_OFFSET; 88 EXPORT_SYMBOL(ARCH_PFN_OFFSET); 89 #endif 90 91 void __init add_memory_region(phys_addr_t start, phys_addr_t size, long type) 92 { 93 /* 94 * Note: This function only exists for historical reason, 95 * new code should use memblock_add or memblock_add_node instead. 96 */ 97 98 /* 99 * If the region reaches the top of the physical address space, adjust 100 * the size slightly so that (start + size) doesn't overflow 101 */ 102 if (start + size - 1 == PHYS_ADDR_MAX) 103 --size; 104 105 /* Sanity check */ 106 if (start + size < start) { 107 pr_warn("Trying to add an invalid memory region, skipped\n"); 108 return; 109 } 110 111 if (start < PHYS_OFFSET) 112 return; 113 114 memblock_add(start, size); 115 /* Reserve any memory except the ordinary RAM ranges. */ 116 switch (type) { 117 case BOOT_MEM_RAM: 118 break; 119 120 case BOOT_MEM_NOMAP: /* Discard the range from the system. */ 121 memblock_remove(start, size); 122 break; 123 124 default: /* Reserve the rest of the memory types at boot time */ 125 memblock_reserve(start, size); 126 break; 127 } 128 } 129 130 void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max) 131 { 132 void *dm = &detect_magic; 133 phys_addr_t size; 134 135 for (size = sz_min; size < sz_max; size <<= 1) { 136 if (!memcmp(dm, dm + size, sizeof(detect_magic))) 137 break; 138 } 139 140 pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n", 141 ((unsigned long long) size) / SZ_1M, 142 (unsigned long long) start, 143 ((unsigned long long) sz_min) / SZ_1M, 144 ((unsigned long long) sz_max) / SZ_1M); 145 146 add_memory_region(start, size, BOOT_MEM_RAM); 147 } 148 149 /* 150 * Manage initrd 151 */ 152 #ifdef CONFIG_BLK_DEV_INITRD 153 154 static int __init rd_start_early(char *p) 155 { 156 unsigned long start = memparse(p, &p); 157 158 #ifdef CONFIG_64BIT 159 /* Guess if the sign extension was forgotten by bootloader */ 160 if (start < XKPHYS) 161 start = (int)start; 162 #endif 163 initrd_start = start; 164 initrd_end += start; 165 return 0; 166 } 167 early_param("rd_start", rd_start_early); 168 169 static int __init rd_size_early(char *p) 170 { 171 initrd_end += memparse(p, &p); 172 return 0; 173 } 174 early_param("rd_size", rd_size_early); 175 176 /* it returns the next free pfn after initrd */ 177 static unsigned long __init init_initrd(void) 178 { 179 unsigned long end; 180 181 /* 182 * Board specific code or command line parser should have 183 * already set up initrd_start and initrd_end. In these cases 184 * perfom sanity checks and use them if all looks good. 185 */ 186 if (!initrd_start || initrd_end <= initrd_start) 187 goto disable; 188 189 if (initrd_start & ~PAGE_MASK) { 190 pr_err("initrd start must be page aligned\n"); 191 goto disable; 192 } 193 if (initrd_start < PAGE_OFFSET) { 194 pr_err("initrd start < PAGE_OFFSET\n"); 195 goto disable; 196 } 197 198 /* 199 * Sanitize initrd addresses. For example firmware 200 * can't guess if they need to pass them through 201 * 64-bits values if the kernel has been built in pure 202 * 32-bit. We need also to switch from KSEG0 to XKPHYS 203 * addresses now, so the code can now safely use __pa(). 204 */ 205 end = __pa(initrd_end); 206 initrd_end = (unsigned long)__va(end); 207 initrd_start = (unsigned long)__va(__pa(initrd_start)); 208 209 ROOT_DEV = Root_RAM0; 210 return PFN_UP(end); 211 disable: 212 initrd_start = 0; 213 initrd_end = 0; 214 return 0; 215 } 216 217 /* In some conditions (e.g. big endian bootloader with a little endian 218 kernel), the initrd might appear byte swapped. Try to detect this and 219 byte swap it if needed. */ 220 static void __init maybe_bswap_initrd(void) 221 { 222 #if defined(CONFIG_CPU_CAVIUM_OCTEON) 223 u64 buf; 224 225 /* Check for CPIO signature */ 226 if (!memcmp((void *)initrd_start, "070701", 6)) 227 return; 228 229 /* Check for compressed initrd */ 230 if (decompress_method((unsigned char *)initrd_start, 8, NULL)) 231 return; 232 233 /* Try again with a byte swapped header */ 234 buf = swab64p((u64 *)initrd_start); 235 if (!memcmp(&buf, "070701", 6) || 236 decompress_method((unsigned char *)(&buf), 8, NULL)) { 237 unsigned long i; 238 239 pr_info("Byteswapped initrd detected\n"); 240 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8) 241 swab64s((u64 *)i); 242 } 243 #endif 244 } 245 246 static void __init finalize_initrd(void) 247 { 248 unsigned long size = initrd_end - initrd_start; 249 250 if (size == 0) { 251 printk(KERN_INFO "Initrd not found or empty"); 252 goto disable; 253 } 254 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) { 255 printk(KERN_ERR "Initrd extends beyond end of memory"); 256 goto disable; 257 } 258 259 maybe_bswap_initrd(); 260 261 memblock_reserve(__pa(initrd_start), size); 262 initrd_below_start_ok = 1; 263 264 pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n", 265 initrd_start, size); 266 return; 267 disable: 268 printk(KERN_CONT " - disabling initrd\n"); 269 initrd_start = 0; 270 initrd_end = 0; 271 } 272 273 #else /* !CONFIG_BLK_DEV_INITRD */ 274 275 static unsigned long __init init_initrd(void) 276 { 277 return 0; 278 } 279 280 #define finalize_initrd() do {} while (0) 281 282 #endif 283 284 /* 285 * Initialize the bootmem allocator. It also setup initrd related data 286 * if needed. 287 */ 288 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON3) && defined(CONFIG_NUMA)) 289 290 static void __init bootmem_init(void) 291 { 292 init_initrd(); 293 finalize_initrd(); 294 } 295 296 #else /* !CONFIG_SGI_IP27 */ 297 298 static void __init bootmem_init(void) 299 { 300 struct memblock_region *mem; 301 phys_addr_t ramstart, ramend; 302 303 ramstart = memblock_start_of_DRAM(); 304 ramend = memblock_end_of_DRAM(); 305 306 /* 307 * Sanity check any INITRD first. We don't take it into account 308 * for bootmem setup initially, rely on the end-of-kernel-code 309 * as our memory range starting point. Once bootmem is inited we 310 * will reserve the area used for the initrd. 311 */ 312 init_initrd(); 313 314 /* Reserve memory occupied by kernel. */ 315 memblock_reserve(__pa_symbol(&_text), 316 __pa_symbol(&_end) - __pa_symbol(&_text)); 317 318 /* max_low_pfn is not a number of pages but the end pfn of low mem */ 319 320 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET 321 ARCH_PFN_OFFSET = PFN_UP(ramstart); 322 #else 323 /* 324 * Reserve any memory between the start of RAM and PHYS_OFFSET 325 */ 326 if (ramstart > PHYS_OFFSET) 327 memblock_reserve(PHYS_OFFSET, ramstart - PHYS_OFFSET); 328 329 if (PFN_UP(ramstart) > ARCH_PFN_OFFSET) { 330 pr_info("Wasting %lu bytes for tracking %lu unused pages\n", 331 (unsigned long)((PFN_UP(ramstart) - ARCH_PFN_OFFSET) * sizeof(struct page)), 332 (unsigned long)(PFN_UP(ramstart) - ARCH_PFN_OFFSET)); 333 } 334 #endif 335 336 min_low_pfn = ARCH_PFN_OFFSET; 337 max_pfn = PFN_DOWN(ramend); 338 for_each_memblock(memory, mem) { 339 unsigned long start = memblock_region_memory_base_pfn(mem); 340 unsigned long end = memblock_region_memory_end_pfn(mem); 341 342 /* 343 * Skip highmem here so we get an accurate max_low_pfn if low 344 * memory stops short of high memory. 345 * If the region overlaps HIGHMEM_START, end is clipped so 346 * max_pfn excludes the highmem portion. 347 */ 348 if (memblock_is_nomap(mem)) 349 continue; 350 if (start >= PFN_DOWN(HIGHMEM_START)) 351 continue; 352 if (end > PFN_DOWN(HIGHMEM_START)) 353 end = PFN_DOWN(HIGHMEM_START); 354 if (end > max_low_pfn) 355 max_low_pfn = end; 356 } 357 358 if (min_low_pfn >= max_low_pfn) 359 panic("Incorrect memory mapping !!!"); 360 361 if (max_pfn > PFN_DOWN(HIGHMEM_START)) { 362 #ifdef CONFIG_HIGHMEM 363 highstart_pfn = PFN_DOWN(HIGHMEM_START); 364 highend_pfn = max_pfn; 365 #else 366 max_low_pfn = PFN_DOWN(HIGHMEM_START); 367 max_pfn = max_low_pfn; 368 #endif 369 } 370 371 372 /* 373 * In any case the added to the memblock memory regions 374 * (highmem/lowmem, available/reserved, etc) are considered 375 * as present, so inform sparsemem about them. 376 */ 377 memblocks_present(); 378 379 /* 380 * Reserve initrd memory if needed. 381 */ 382 finalize_initrd(); 383 } 384 385 #endif /* CONFIG_SGI_IP27 */ 386 387 static int usermem __initdata; 388 389 static int __init early_parse_mem(char *p) 390 { 391 phys_addr_t start, size; 392 393 /* 394 * If a user specifies memory size, we 395 * blow away any automatically generated 396 * size. 397 */ 398 if (usermem == 0) { 399 usermem = 1; 400 memblock_remove(memblock_start_of_DRAM(), 401 memblock_end_of_DRAM() - memblock_start_of_DRAM()); 402 } 403 start = 0; 404 size = memparse(p, &p); 405 if (*p == '@') 406 start = memparse(p + 1, &p); 407 408 add_memory_region(start, size, BOOT_MEM_RAM); 409 410 return 0; 411 } 412 early_param("mem", early_parse_mem); 413 414 static int __init early_parse_memmap(char *p) 415 { 416 char *oldp; 417 u64 start_at, mem_size; 418 419 if (!p) 420 return -EINVAL; 421 422 if (!strncmp(p, "exactmap", 8)) { 423 pr_err("\"memmap=exactmap\" invalid on MIPS\n"); 424 return 0; 425 } 426 427 oldp = p; 428 mem_size = memparse(p, &p); 429 if (p == oldp) 430 return -EINVAL; 431 432 if (*p == '@') { 433 start_at = memparse(p+1, &p); 434 add_memory_region(start_at, mem_size, BOOT_MEM_RAM); 435 } else if (*p == '#') { 436 pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n"); 437 return -EINVAL; 438 } else if (*p == '$') { 439 start_at = memparse(p+1, &p); 440 add_memory_region(start_at, mem_size, BOOT_MEM_RESERVED); 441 } else { 442 pr_err("\"memmap\" invalid format!\n"); 443 return -EINVAL; 444 } 445 446 if (*p == '\0') { 447 usermem = 1; 448 return 0; 449 } else 450 return -EINVAL; 451 } 452 early_param("memmap", early_parse_memmap); 453 454 #ifdef CONFIG_PROC_VMCORE 455 unsigned long setup_elfcorehdr, setup_elfcorehdr_size; 456 static int __init early_parse_elfcorehdr(char *p) 457 { 458 struct memblock_region *mem; 459 460 setup_elfcorehdr = memparse(p, &p); 461 462 for_each_memblock(memory, mem) { 463 unsigned long start = mem->base; 464 unsigned long end = start + mem->size; 465 if (setup_elfcorehdr >= start && setup_elfcorehdr < end) { 466 /* 467 * Reserve from the elf core header to the end of 468 * the memory segment, that should all be kdump 469 * reserved memory. 470 */ 471 setup_elfcorehdr_size = end - setup_elfcorehdr; 472 break; 473 } 474 } 475 /* 476 * If we don't find it in the memory map, then we shouldn't 477 * have to worry about it, as the new kernel won't use it. 478 */ 479 return 0; 480 } 481 early_param("elfcorehdr", early_parse_elfcorehdr); 482 #endif 483 484 #ifdef CONFIG_KEXEC 485 static void __init mips_parse_crashkernel(void) 486 { 487 unsigned long long total_mem; 488 unsigned long long crash_size, crash_base; 489 int ret; 490 491 total_mem = memblock_phys_mem_size(); 492 ret = parse_crashkernel(boot_command_line, total_mem, 493 &crash_size, &crash_base); 494 if (ret != 0 || crash_size <= 0) 495 return; 496 497 if (!memblock_find_in_range(crash_base, crash_base + crash_size, crash_size, 0)) { 498 pr_warn("Invalid memory region reserved for crash kernel\n"); 499 return; 500 } 501 502 crashk_res.start = crash_base; 503 crashk_res.end = crash_base + crash_size - 1; 504 } 505 506 static void __init request_crashkernel(struct resource *res) 507 { 508 int ret; 509 510 if (crashk_res.start == crashk_res.end) 511 return; 512 513 ret = request_resource(res, &crashk_res); 514 if (!ret) 515 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n", 516 (unsigned long)((crashk_res.end - 517 crashk_res.start + 1) >> 20), 518 (unsigned long)(crashk_res.start >> 20)); 519 } 520 #else /* !defined(CONFIG_KEXEC) */ 521 static void __init mips_parse_crashkernel(void) 522 { 523 } 524 525 static void __init request_crashkernel(struct resource *res) 526 { 527 } 528 #endif /* !defined(CONFIG_KEXEC) */ 529 530 static void __init check_kernel_sections_mem(void) 531 { 532 phys_addr_t start = PFN_PHYS(PFN_DOWN(__pa_symbol(&_text))); 533 phys_addr_t size = PFN_PHYS(PFN_UP(__pa_symbol(&_end))) - start; 534 535 if (!memblock_is_region_memory(start, size)) { 536 pr_info("Kernel sections are not in the memory maps\n"); 537 memblock_add(start, size); 538 } 539 } 540 541 #define USE_PROM_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_BOOTLOADER) 542 #define USE_DTB_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB) 543 #define EXTEND_WITH_PROM IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND) 544 #define BUILTIN_EXTEND_WITH_PROM \ 545 IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND) 546 547 /* 548 * arch_mem_init - initialize memory management subsystem 549 * 550 * o plat_mem_setup() detects the memory configuration and will record detected 551 * memory areas using add_memory_region. 552 * 553 * At this stage the memory configuration of the system is known to the 554 * kernel but generic memory management system is still entirely uninitialized. 555 * 556 * o bootmem_init() 557 * o sparse_init() 558 * o paging_init() 559 * o dma_contiguous_reserve() 560 * 561 * At this stage the bootmem allocator is ready to use. 562 * 563 * NOTE: historically plat_mem_setup did the entire platform initialization. 564 * This was rather impractical because it meant plat_mem_setup had to 565 * get away without any kind of memory allocator. To keep old code from 566 * breaking plat_setup was just renamed to plat_mem_setup and a second platform 567 * initialization hook for anything else was introduced. 568 */ 569 static void __init arch_mem_init(char **cmdline_p) 570 { 571 extern void plat_mem_setup(void); 572 573 /* 574 * Initialize boot_command_line to an innocuous but non-empty string in 575 * order to prevent early_init_dt_scan_chosen() from copying 576 * CONFIG_CMDLINE into it without our knowledge. We handle 577 * CONFIG_CMDLINE ourselves below & don't want to duplicate its 578 * content because repeating arguments can be problematic. 579 */ 580 strlcpy(boot_command_line, " ", COMMAND_LINE_SIZE); 581 582 /* call board setup routine */ 583 plat_mem_setup(); 584 memblock_set_bottom_up(true); 585 586 #if defined(CONFIG_CMDLINE_BOOL) && defined(CONFIG_CMDLINE_OVERRIDE) 587 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); 588 #else 589 if ((USE_PROM_CMDLINE && arcs_cmdline[0]) || 590 (USE_DTB_CMDLINE && !boot_command_line[0])) 591 strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE); 592 593 if (EXTEND_WITH_PROM && arcs_cmdline[0]) { 594 if (boot_command_line[0]) 595 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE); 596 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE); 597 } 598 599 #if defined(CONFIG_CMDLINE_BOOL) 600 if (builtin_cmdline[0]) { 601 if (boot_command_line[0]) 602 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE); 603 strlcat(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); 604 } 605 606 if (BUILTIN_EXTEND_WITH_PROM && arcs_cmdline[0]) { 607 if (boot_command_line[0]) 608 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE); 609 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE); 610 } 611 #endif 612 #endif 613 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE); 614 615 *cmdline_p = command_line; 616 617 parse_early_param(); 618 619 if (usermem) 620 pr_info("User-defined physical RAM map overwrite\n"); 621 622 check_kernel_sections_mem(); 623 624 early_init_fdt_reserve_self(); 625 early_init_fdt_scan_reserved_mem(); 626 627 #ifndef CONFIG_NUMA 628 memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0); 629 #endif 630 bootmem_init(); 631 632 /* 633 * Prevent memblock from allocating high memory. 634 * This cannot be done before max_low_pfn is detected, so up 635 * to this point is possible to only reserve physical memory 636 * with memblock_reserve; memblock_alloc* can be used 637 * only after this point 638 */ 639 memblock_set_current_limit(PFN_PHYS(max_low_pfn)); 640 641 #ifdef CONFIG_PROC_VMCORE 642 if (setup_elfcorehdr && setup_elfcorehdr_size) { 643 printk(KERN_INFO "kdump reserved memory at %lx-%lx\n", 644 setup_elfcorehdr, setup_elfcorehdr_size); 645 memblock_reserve(setup_elfcorehdr, setup_elfcorehdr_size); 646 } 647 #endif 648 649 mips_parse_crashkernel(); 650 #ifdef CONFIG_KEXEC 651 if (crashk_res.start != crashk_res.end) 652 memblock_reserve(crashk_res.start, 653 crashk_res.end - crashk_res.start + 1); 654 #endif 655 device_tree_init(); 656 sparse_init(); 657 plat_swiotlb_setup(); 658 659 dma_contiguous_reserve(PFN_PHYS(max_low_pfn)); 660 661 /* Reserve for hibernation. */ 662 memblock_reserve(__pa_symbol(&__nosave_begin), 663 __pa_symbol(&__nosave_end) - __pa_symbol(&__nosave_begin)); 664 665 fdt_init_reserved_mem(); 666 667 memblock_dump_all(); 668 669 early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn)); 670 } 671 672 static void __init resource_init(void) 673 { 674 struct memblock_region *region; 675 676 if (UNCAC_BASE != IO_BASE) 677 return; 678 679 code_resource.start = __pa_symbol(&_text); 680 code_resource.end = __pa_symbol(&_etext) - 1; 681 data_resource.start = __pa_symbol(&_etext); 682 data_resource.end = __pa_symbol(&_edata) - 1; 683 bss_resource.start = __pa_symbol(&__bss_start); 684 bss_resource.end = __pa_symbol(&__bss_stop) - 1; 685 686 for_each_memblock(memory, region) { 687 phys_addr_t start = PFN_PHYS(memblock_region_memory_base_pfn(region)); 688 phys_addr_t end = PFN_PHYS(memblock_region_memory_end_pfn(region)) - 1; 689 struct resource *res; 690 691 res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES); 692 if (!res) 693 panic("%s: Failed to allocate %zu bytes\n", __func__, 694 sizeof(struct resource)); 695 696 res->start = start; 697 res->end = end; 698 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; 699 res->name = "System RAM"; 700 701 request_resource(&iomem_resource, res); 702 703 /* 704 * We don't know which RAM region contains kernel data, 705 * so we try it repeatedly and let the resource manager 706 * test it. 707 */ 708 request_resource(res, &code_resource); 709 request_resource(res, &data_resource); 710 request_resource(res, &bss_resource); 711 request_crashkernel(res); 712 } 713 } 714 715 #ifdef CONFIG_SMP 716 static void __init prefill_possible_map(void) 717 { 718 int i, possible = num_possible_cpus(); 719 720 if (possible > nr_cpu_ids) 721 possible = nr_cpu_ids; 722 723 for (i = 0; i < possible; i++) 724 set_cpu_possible(i, true); 725 for (; i < NR_CPUS; i++) 726 set_cpu_possible(i, false); 727 728 nr_cpu_ids = possible; 729 } 730 #else 731 static inline void prefill_possible_map(void) {} 732 #endif 733 734 void __init setup_arch(char **cmdline_p) 735 { 736 cpu_probe(); 737 mips_cm_probe(); 738 prom_init(); 739 740 setup_early_fdc_console(); 741 #ifdef CONFIG_EARLY_PRINTK 742 setup_early_printk(); 743 #endif 744 cpu_report(); 745 check_bugs_early(); 746 747 #if defined(CONFIG_VT) 748 #if defined(CONFIG_VGA_CONSOLE) 749 conswitchp = &vga_con; 750 #elif defined(CONFIG_DUMMY_CONSOLE) 751 conswitchp = &dummy_con; 752 #endif 753 #endif 754 755 arch_mem_init(cmdline_p); 756 757 resource_init(); 758 plat_smp_setup(); 759 prefill_possible_map(); 760 761 cpu_cache_init(); 762 paging_init(); 763 } 764 765 unsigned long kernelsp[NR_CPUS]; 766 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3; 767 768 #ifdef CONFIG_USE_OF 769 unsigned long fw_passed_dtb; 770 #endif 771 772 #ifdef CONFIG_DEBUG_FS 773 struct dentry *mips_debugfs_dir; 774 static int __init debugfs_mips(void) 775 { 776 mips_debugfs_dir = debugfs_create_dir("mips", NULL); 777 return 0; 778 } 779 arch_initcall(debugfs_mips); 780 #endif 781 782 #ifdef CONFIG_DMA_MAYBE_COHERENT 783 /* User defined DMA coherency from command line. */ 784 enum coherent_io_user_state coherentio = IO_COHERENCE_DEFAULT; 785 EXPORT_SYMBOL_GPL(coherentio); 786 int hw_coherentio = 0; /* Actual hardware supported DMA coherency setting. */ 787 788 static int __init setcoherentio(char *str) 789 { 790 coherentio = IO_COHERENCE_ENABLED; 791 pr_info("Hardware DMA cache coherency (command line)\n"); 792 return 0; 793 } 794 early_param("coherentio", setcoherentio); 795 796 static int __init setnocoherentio(char *str) 797 { 798 coherentio = IO_COHERENCE_DISABLED; 799 pr_info("Software DMA cache coherency (command line)\n"); 800 return 0; 801 } 802 early_param("nocoherentio", setnocoherentio); 803 #endif 804