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 struct boot_mem_map boot_mem_map; 67 68 static char __initdata command_line[COMMAND_LINE_SIZE]; 69 char __initdata arcs_cmdline[COMMAND_LINE_SIZE]; 70 71 #ifdef CONFIG_CMDLINE_BOOL 72 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE; 73 #endif 74 75 /* 76 * mips_io_port_base is the begin of the address space to which x86 style 77 * I/O ports are mapped. 78 */ 79 const unsigned long mips_io_port_base = -1; 80 EXPORT_SYMBOL(mips_io_port_base); 81 82 static struct resource code_resource = { .name = "Kernel code", }; 83 static struct resource data_resource = { .name = "Kernel data", }; 84 static struct resource bss_resource = { .name = "Kernel bss", }; 85 86 static void *detect_magic __initdata = detect_memory_region; 87 88 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET 89 unsigned long ARCH_PFN_OFFSET; 90 EXPORT_SYMBOL(ARCH_PFN_OFFSET); 91 #endif 92 93 void __init add_memory_region(phys_addr_t start, phys_addr_t size, long type) 94 { 95 int x = boot_mem_map.nr_map; 96 int i; 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 /* 112 * Try to merge with existing entry, if any. 113 */ 114 for (i = 0; i < boot_mem_map.nr_map; i++) { 115 struct boot_mem_map_entry *entry = boot_mem_map.map + i; 116 unsigned long top; 117 118 if (entry->type != type) 119 continue; 120 121 if (start + size < entry->addr) 122 continue; /* no overlap */ 123 124 if (entry->addr + entry->size < start) 125 continue; /* no overlap */ 126 127 top = max(entry->addr + entry->size, start + size); 128 entry->addr = min(entry->addr, start); 129 entry->size = top - entry->addr; 130 131 return; 132 } 133 134 if (boot_mem_map.nr_map == BOOT_MEM_MAP_MAX) { 135 pr_err("Ooops! Too many entries in the memory map!\n"); 136 return; 137 } 138 139 boot_mem_map.map[x].addr = start; 140 boot_mem_map.map[x].size = size; 141 boot_mem_map.map[x].type = type; 142 boot_mem_map.nr_map++; 143 } 144 145 void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max) 146 { 147 void *dm = &detect_magic; 148 phys_addr_t size; 149 150 for (size = sz_min; size < sz_max; size <<= 1) { 151 if (!memcmp(dm, dm + size, sizeof(detect_magic))) 152 break; 153 } 154 155 pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n", 156 ((unsigned long long) size) / SZ_1M, 157 (unsigned long long) start, 158 ((unsigned long long) sz_min) / SZ_1M, 159 ((unsigned long long) sz_max) / SZ_1M); 160 161 add_memory_region(start, size, BOOT_MEM_RAM); 162 } 163 164 static bool __init __maybe_unused memory_region_available(phys_addr_t start, 165 phys_addr_t size) 166 { 167 int i; 168 bool in_ram = false, free = true; 169 170 for (i = 0; i < boot_mem_map.nr_map; i++) { 171 phys_addr_t start_, end_; 172 173 start_ = boot_mem_map.map[i].addr; 174 end_ = boot_mem_map.map[i].addr + boot_mem_map.map[i].size; 175 176 switch (boot_mem_map.map[i].type) { 177 case BOOT_MEM_RAM: 178 if (start >= start_ && start + size <= end_) 179 in_ram = true; 180 break; 181 case BOOT_MEM_RESERVED: 182 case BOOT_MEM_NOMAP: 183 if ((start >= start_ && start < end_) || 184 (start < start_ && start + size >= start_)) 185 free = false; 186 break; 187 default: 188 continue; 189 } 190 } 191 192 return in_ram && free; 193 } 194 195 static void __init print_memory_map(void) 196 { 197 int i; 198 const int field = 2 * sizeof(unsigned long); 199 200 for (i = 0; i < boot_mem_map.nr_map; i++) { 201 printk(KERN_INFO " memory: %0*Lx @ %0*Lx ", 202 field, (unsigned long long) boot_mem_map.map[i].size, 203 field, (unsigned long long) boot_mem_map.map[i].addr); 204 205 switch (boot_mem_map.map[i].type) { 206 case BOOT_MEM_RAM: 207 printk(KERN_CONT "(usable)\n"); 208 break; 209 case BOOT_MEM_INIT_RAM: 210 printk(KERN_CONT "(usable after init)\n"); 211 break; 212 case BOOT_MEM_ROM_DATA: 213 printk(KERN_CONT "(ROM data)\n"); 214 break; 215 case BOOT_MEM_RESERVED: 216 printk(KERN_CONT "(reserved)\n"); 217 break; 218 case BOOT_MEM_NOMAP: 219 printk(KERN_CONT "(nomap)\n"); 220 break; 221 default: 222 printk(KERN_CONT "type %lu\n", boot_mem_map.map[i].type); 223 break; 224 } 225 } 226 } 227 228 /* 229 * Manage initrd 230 */ 231 #ifdef CONFIG_BLK_DEV_INITRD 232 233 static int __init rd_start_early(char *p) 234 { 235 unsigned long start = memparse(p, &p); 236 237 #ifdef CONFIG_64BIT 238 /* Guess if the sign extension was forgotten by bootloader */ 239 if (start < XKPHYS) 240 start = (int)start; 241 #endif 242 initrd_start = start; 243 initrd_end += start; 244 return 0; 245 } 246 early_param("rd_start", rd_start_early); 247 248 static int __init rd_size_early(char *p) 249 { 250 initrd_end += memparse(p, &p); 251 return 0; 252 } 253 early_param("rd_size", rd_size_early); 254 255 /* it returns the next free pfn after initrd */ 256 static unsigned long __init init_initrd(void) 257 { 258 unsigned long end; 259 260 /* 261 * Board specific code or command line parser should have 262 * already set up initrd_start and initrd_end. In these cases 263 * perfom sanity checks and use them if all looks good. 264 */ 265 if (!initrd_start || initrd_end <= initrd_start) 266 goto disable; 267 268 if (initrd_start & ~PAGE_MASK) { 269 pr_err("initrd start must be page aligned\n"); 270 goto disable; 271 } 272 if (initrd_start < PAGE_OFFSET) { 273 pr_err("initrd start < PAGE_OFFSET\n"); 274 goto disable; 275 } 276 277 /* 278 * Sanitize initrd addresses. For example firmware 279 * can't guess if they need to pass them through 280 * 64-bits values if the kernel has been built in pure 281 * 32-bit. We need also to switch from KSEG0 to XKPHYS 282 * addresses now, so the code can now safely use __pa(). 283 */ 284 end = __pa(initrd_end); 285 initrd_end = (unsigned long)__va(end); 286 initrd_start = (unsigned long)__va(__pa(initrd_start)); 287 288 ROOT_DEV = Root_RAM0; 289 return PFN_UP(end); 290 disable: 291 initrd_start = 0; 292 initrd_end = 0; 293 return 0; 294 } 295 296 /* In some conditions (e.g. big endian bootloader with a little endian 297 kernel), the initrd might appear byte swapped. Try to detect this and 298 byte swap it if needed. */ 299 static void __init maybe_bswap_initrd(void) 300 { 301 #if defined(CONFIG_CPU_CAVIUM_OCTEON) 302 u64 buf; 303 304 /* Check for CPIO signature */ 305 if (!memcmp((void *)initrd_start, "070701", 6)) 306 return; 307 308 /* Check for compressed initrd */ 309 if (decompress_method((unsigned char *)initrd_start, 8, NULL)) 310 return; 311 312 /* Try again with a byte swapped header */ 313 buf = swab64p((u64 *)initrd_start); 314 if (!memcmp(&buf, "070701", 6) || 315 decompress_method((unsigned char *)(&buf), 8, NULL)) { 316 unsigned long i; 317 318 pr_info("Byteswapped initrd detected\n"); 319 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8) 320 swab64s((u64 *)i); 321 } 322 #endif 323 } 324 325 static void __init finalize_initrd(void) 326 { 327 unsigned long size = initrd_end - initrd_start; 328 329 if (size == 0) { 330 printk(KERN_INFO "Initrd not found or empty"); 331 goto disable; 332 } 333 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) { 334 printk(KERN_ERR "Initrd extends beyond end of memory"); 335 goto disable; 336 } 337 338 maybe_bswap_initrd(); 339 340 memblock_reserve(__pa(initrd_start), size); 341 initrd_below_start_ok = 1; 342 343 pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n", 344 initrd_start, size); 345 return; 346 disable: 347 printk(KERN_CONT " - disabling initrd\n"); 348 initrd_start = 0; 349 initrd_end = 0; 350 } 351 352 #else /* !CONFIG_BLK_DEV_INITRD */ 353 354 static unsigned long __init init_initrd(void) 355 { 356 return 0; 357 } 358 359 #define finalize_initrd() do {} while (0) 360 361 #endif 362 363 /* 364 * Initialize the bootmem allocator. It also setup initrd related data 365 * if needed. 366 */ 367 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON3) && defined(CONFIG_NUMA)) 368 369 static void __init bootmem_init(void) 370 { 371 init_initrd(); 372 finalize_initrd(); 373 } 374 375 #else /* !CONFIG_SGI_IP27 */ 376 377 static void __init bootmem_init(void) 378 { 379 phys_addr_t ramstart = PHYS_ADDR_MAX; 380 int i; 381 382 /* 383 * Sanity check any INITRD first. We don't take it into account 384 * for bootmem setup initially, rely on the end-of-kernel-code 385 * as our memory range starting point. Once bootmem is inited we 386 * will reserve the area used for the initrd. 387 */ 388 init_initrd(); 389 390 /* Reserve memory occupied by kernel. */ 391 memblock_reserve(__pa_symbol(&_text), 392 __pa_symbol(&_end) - __pa_symbol(&_text)); 393 394 /* 395 * max_low_pfn is not a number of pages. The number of pages 396 * of the system is given by 'max_low_pfn - min_low_pfn'. 397 */ 398 min_low_pfn = ~0UL; 399 max_low_pfn = 0; 400 401 /* Find the highest and lowest page frame numbers we have available. */ 402 for (i = 0; i < boot_mem_map.nr_map; i++) { 403 unsigned long start, end; 404 405 if (boot_mem_map.map[i].type != BOOT_MEM_RAM) 406 continue; 407 408 start = PFN_UP(boot_mem_map.map[i].addr); 409 end = PFN_DOWN(boot_mem_map.map[i].addr 410 + boot_mem_map.map[i].size); 411 412 ramstart = min(ramstart, boot_mem_map.map[i].addr); 413 414 #ifndef CONFIG_HIGHMEM 415 /* 416 * Skip highmem here so we get an accurate max_low_pfn if low 417 * memory stops short of high memory. 418 * If the region overlaps HIGHMEM_START, end is clipped so 419 * max_pfn excludes the highmem portion. 420 */ 421 if (start >= PFN_DOWN(HIGHMEM_START)) 422 continue; 423 if (end > PFN_DOWN(HIGHMEM_START)) 424 end = PFN_DOWN(HIGHMEM_START); 425 #endif 426 427 if (end > max_low_pfn) 428 max_low_pfn = end; 429 if (start < min_low_pfn) 430 min_low_pfn = start; 431 } 432 433 if (min_low_pfn >= max_low_pfn) 434 panic("Incorrect memory mapping !!!"); 435 436 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET 437 ARCH_PFN_OFFSET = PFN_UP(ramstart); 438 #else 439 /* 440 * Reserve any memory between the start of RAM and PHYS_OFFSET 441 */ 442 if (ramstart > PHYS_OFFSET) { 443 add_memory_region(PHYS_OFFSET, ramstart - PHYS_OFFSET, 444 BOOT_MEM_RESERVED); 445 memblock_reserve(PHYS_OFFSET, ramstart - PHYS_OFFSET); 446 } 447 448 if (min_low_pfn > ARCH_PFN_OFFSET) { 449 pr_info("Wasting %lu bytes for tracking %lu unused pages\n", 450 (min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page), 451 min_low_pfn - ARCH_PFN_OFFSET); 452 } else if (ARCH_PFN_OFFSET - min_low_pfn > 0UL) { 453 pr_info("%lu free pages won't be used\n", 454 ARCH_PFN_OFFSET - min_low_pfn); 455 } 456 min_low_pfn = ARCH_PFN_OFFSET; 457 #endif 458 459 /* 460 * Determine low and high memory ranges 461 */ 462 max_pfn = max_low_pfn; 463 if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) { 464 #ifdef CONFIG_HIGHMEM 465 highstart_pfn = PFN_DOWN(HIGHMEM_START); 466 highend_pfn = max_low_pfn; 467 #endif 468 max_low_pfn = PFN_DOWN(HIGHMEM_START); 469 } 470 471 /* Install all valid RAM ranges to the memblock memory region */ 472 for (i = 0; i < boot_mem_map.nr_map; i++) { 473 unsigned long start, end; 474 475 start = PFN_UP(boot_mem_map.map[i].addr); 476 end = PFN_DOWN(boot_mem_map.map[i].addr 477 + boot_mem_map.map[i].size); 478 479 if (start < min_low_pfn) 480 start = min_low_pfn; 481 #ifndef CONFIG_HIGHMEM 482 /* Ignore highmem regions if highmem is unsupported */ 483 if (end > max_low_pfn) 484 end = max_low_pfn; 485 #endif 486 if (end <= start) 487 continue; 488 489 memblock_add_node(PFN_PHYS(start), PFN_PHYS(end - start), 0); 490 491 /* Reserve any memory except the ordinary RAM ranges. */ 492 switch (boot_mem_map.map[i].type) { 493 case BOOT_MEM_RAM: 494 break; 495 case BOOT_MEM_NOMAP: /* Discard the range from the system. */ 496 memblock_remove(PFN_PHYS(start), PFN_PHYS(end - start)); 497 continue; 498 default: /* Reserve the rest of the memory types at boot time */ 499 memblock_reserve(PFN_PHYS(start), PFN_PHYS(end - start)); 500 break; 501 } 502 503 /* 504 * In any case the added to the memblock memory regions 505 * (highmem/lowmem, available/reserved, etc) are considered 506 * as present, so inform sparsemem about them. 507 */ 508 memory_present(0, start, end); 509 } 510 511 /* 512 * Reserve initrd memory if needed. 513 */ 514 finalize_initrd(); 515 } 516 517 #endif /* CONFIG_SGI_IP27 */ 518 519 static int usermem __initdata; 520 521 static int __init early_parse_mem(char *p) 522 { 523 phys_addr_t start, size; 524 525 /* 526 * If a user specifies memory size, we 527 * blow away any automatically generated 528 * size. 529 */ 530 if (usermem == 0) { 531 boot_mem_map.nr_map = 0; 532 usermem = 1; 533 } 534 start = 0; 535 size = memparse(p, &p); 536 if (*p == '@') 537 start = memparse(p + 1, &p); 538 539 add_memory_region(start, size, BOOT_MEM_RAM); 540 541 return 0; 542 } 543 early_param("mem", early_parse_mem); 544 545 static int __init early_parse_memmap(char *p) 546 { 547 char *oldp; 548 u64 start_at, mem_size; 549 550 if (!p) 551 return -EINVAL; 552 553 if (!strncmp(p, "exactmap", 8)) { 554 pr_err("\"memmap=exactmap\" invalid on MIPS\n"); 555 return 0; 556 } 557 558 oldp = p; 559 mem_size = memparse(p, &p); 560 if (p == oldp) 561 return -EINVAL; 562 563 if (*p == '@') { 564 start_at = memparse(p+1, &p); 565 add_memory_region(start_at, mem_size, BOOT_MEM_RAM); 566 } else if (*p == '#') { 567 pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n"); 568 return -EINVAL; 569 } else if (*p == '$') { 570 start_at = memparse(p+1, &p); 571 add_memory_region(start_at, mem_size, BOOT_MEM_RESERVED); 572 } else { 573 pr_err("\"memmap\" invalid format!\n"); 574 return -EINVAL; 575 } 576 577 if (*p == '\0') { 578 usermem = 1; 579 return 0; 580 } else 581 return -EINVAL; 582 } 583 early_param("memmap", early_parse_memmap); 584 585 #ifdef CONFIG_PROC_VMCORE 586 unsigned long setup_elfcorehdr, setup_elfcorehdr_size; 587 static int __init early_parse_elfcorehdr(char *p) 588 { 589 int i; 590 591 setup_elfcorehdr = memparse(p, &p); 592 593 for (i = 0; i < boot_mem_map.nr_map; i++) { 594 unsigned long start = boot_mem_map.map[i].addr; 595 unsigned long end = (boot_mem_map.map[i].addr + 596 boot_mem_map.map[i].size); 597 if (setup_elfcorehdr >= start && setup_elfcorehdr < end) { 598 /* 599 * Reserve from the elf core header to the end of 600 * the memory segment, that should all be kdump 601 * reserved memory. 602 */ 603 setup_elfcorehdr_size = end - setup_elfcorehdr; 604 break; 605 } 606 } 607 /* 608 * If we don't find it in the memory map, then we shouldn't 609 * have to worry about it, as the new kernel won't use it. 610 */ 611 return 0; 612 } 613 early_param("elfcorehdr", early_parse_elfcorehdr); 614 #endif 615 616 static void __init arch_mem_addpart(phys_addr_t mem, phys_addr_t end, int type) 617 { 618 phys_addr_t size; 619 int i; 620 621 size = end - mem; 622 if (!size) 623 return; 624 625 /* Make sure it is in the boot_mem_map */ 626 for (i = 0; i < boot_mem_map.nr_map; i++) { 627 if (mem >= boot_mem_map.map[i].addr && 628 mem < (boot_mem_map.map[i].addr + 629 boot_mem_map.map[i].size)) 630 return; 631 } 632 add_memory_region(mem, size, type); 633 } 634 635 #ifdef CONFIG_KEXEC 636 static inline unsigned long long get_total_mem(void) 637 { 638 unsigned long long total; 639 640 total = max_pfn - min_low_pfn; 641 return total << PAGE_SHIFT; 642 } 643 644 static void __init mips_parse_crashkernel(void) 645 { 646 unsigned long long total_mem; 647 unsigned long long crash_size, crash_base; 648 int ret; 649 650 total_mem = get_total_mem(); 651 ret = parse_crashkernel(boot_command_line, total_mem, 652 &crash_size, &crash_base); 653 if (ret != 0 || crash_size <= 0) 654 return; 655 656 if (!memory_region_available(crash_base, crash_size)) { 657 pr_warn("Invalid memory region reserved for crash kernel\n"); 658 return; 659 } 660 661 crashk_res.start = crash_base; 662 crashk_res.end = crash_base + crash_size - 1; 663 } 664 665 static void __init request_crashkernel(struct resource *res) 666 { 667 int ret; 668 669 if (crashk_res.start == crashk_res.end) 670 return; 671 672 ret = request_resource(res, &crashk_res); 673 if (!ret) 674 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n", 675 (unsigned long)((crashk_res.end - 676 crashk_res.start + 1) >> 20), 677 (unsigned long)(crashk_res.start >> 20)); 678 } 679 #else /* !defined(CONFIG_KEXEC) */ 680 static void __init mips_parse_crashkernel(void) 681 { 682 } 683 684 static void __init request_crashkernel(struct resource *res) 685 { 686 } 687 #endif /* !defined(CONFIG_KEXEC) */ 688 689 #define USE_PROM_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_BOOTLOADER) 690 #define USE_DTB_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB) 691 #define EXTEND_WITH_PROM IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND) 692 #define BUILTIN_EXTEND_WITH_PROM \ 693 IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND) 694 695 /* 696 * arch_mem_init - initialize memory management subsystem 697 * 698 * o plat_mem_setup() detects the memory configuration and will record detected 699 * memory areas using add_memory_region. 700 * 701 * At this stage the memory configuration of the system is known to the 702 * kernel but generic memory management system is still entirely uninitialized. 703 * 704 * o bootmem_init() 705 * o sparse_init() 706 * o paging_init() 707 * o dma_contiguous_reserve() 708 * 709 * At this stage the bootmem allocator is ready to use. 710 * 711 * NOTE: historically plat_mem_setup did the entire platform initialization. 712 * This was rather impractical because it meant plat_mem_setup had to 713 * get away without any kind of memory allocator. To keep old code from 714 * breaking plat_setup was just renamed to plat_mem_setup and a second platform 715 * initialization hook for anything else was introduced. 716 */ 717 static void __init arch_mem_init(char **cmdline_p) 718 { 719 extern void plat_mem_setup(void); 720 721 /* 722 * Initialize boot_command_line to an innocuous but non-empty string in 723 * order to prevent early_init_dt_scan_chosen() from copying 724 * CONFIG_CMDLINE into it without our knowledge. We handle 725 * CONFIG_CMDLINE ourselves below & don't want to duplicate its 726 * content because repeating arguments can be problematic. 727 */ 728 strlcpy(boot_command_line, " ", COMMAND_LINE_SIZE); 729 730 /* call board setup routine */ 731 plat_mem_setup(); 732 memblock_set_bottom_up(true); 733 734 /* 735 * Make sure all kernel memory is in the maps. The "UP" and 736 * "DOWN" are opposite for initdata since if it crosses over 737 * into another memory section you don't want that to be 738 * freed when the initdata is freed. 739 */ 740 arch_mem_addpart(PFN_DOWN(__pa_symbol(&_text)) << PAGE_SHIFT, 741 PFN_UP(__pa_symbol(&_edata)) << PAGE_SHIFT, 742 BOOT_MEM_RAM); 743 arch_mem_addpart(PFN_UP(__pa_symbol(&__init_begin)) << PAGE_SHIFT, 744 PFN_DOWN(__pa_symbol(&__init_end)) << PAGE_SHIFT, 745 BOOT_MEM_INIT_RAM); 746 arch_mem_addpart(PFN_DOWN(__pa_symbol(&__bss_start)) << PAGE_SHIFT, 747 PFN_UP(__pa_symbol(&__bss_stop)) << PAGE_SHIFT, 748 BOOT_MEM_RAM); 749 750 pr_info("Determined physical RAM map:\n"); 751 print_memory_map(); 752 753 #if defined(CONFIG_CMDLINE_BOOL) && defined(CONFIG_CMDLINE_OVERRIDE) 754 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); 755 #else 756 if ((USE_PROM_CMDLINE && arcs_cmdline[0]) || 757 (USE_DTB_CMDLINE && !boot_command_line[0])) 758 strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE); 759 760 if (EXTEND_WITH_PROM && arcs_cmdline[0]) { 761 if (boot_command_line[0]) 762 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE); 763 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE); 764 } 765 766 #if defined(CONFIG_CMDLINE_BOOL) 767 if (builtin_cmdline[0]) { 768 if (boot_command_line[0]) 769 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE); 770 strlcat(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); 771 } 772 773 if (BUILTIN_EXTEND_WITH_PROM && arcs_cmdline[0]) { 774 if (boot_command_line[0]) 775 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE); 776 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE); 777 } 778 #endif 779 #endif 780 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE); 781 782 *cmdline_p = command_line; 783 784 parse_early_param(); 785 786 if (usermem) { 787 pr_info("User-defined physical RAM map:\n"); 788 print_memory_map(); 789 } 790 791 early_init_fdt_reserve_self(); 792 early_init_fdt_scan_reserved_mem(); 793 794 bootmem_init(); 795 796 /* 797 * Prevent memblock from allocating high memory. 798 * This cannot be done before max_low_pfn is detected, so up 799 * to this point is possible to only reserve physical memory 800 * with memblock_reserve; memblock_alloc* can be used 801 * only after this point 802 */ 803 memblock_set_current_limit(PFN_PHYS(max_low_pfn)); 804 805 #ifdef CONFIG_PROC_VMCORE 806 if (setup_elfcorehdr && setup_elfcorehdr_size) { 807 printk(KERN_INFO "kdump reserved memory at %lx-%lx\n", 808 setup_elfcorehdr, setup_elfcorehdr_size); 809 memblock_reserve(setup_elfcorehdr, setup_elfcorehdr_size); 810 } 811 #endif 812 813 mips_parse_crashkernel(); 814 #ifdef CONFIG_KEXEC 815 if (crashk_res.start != crashk_res.end) 816 memblock_reserve(crashk_res.start, 817 crashk_res.end - crashk_res.start + 1); 818 #endif 819 device_tree_init(); 820 sparse_init(); 821 plat_swiotlb_setup(); 822 823 dma_contiguous_reserve(PFN_PHYS(max_low_pfn)); 824 825 /* Reserve for hibernation. */ 826 memblock_reserve(__pa_symbol(&__nosave_begin), 827 __pa_symbol(&__nosave_end) - __pa_symbol(&__nosave_begin)); 828 829 fdt_init_reserved_mem(); 830 831 memblock_dump_all(); 832 833 early_memtest(PFN_PHYS(min_low_pfn), PFN_PHYS(max_low_pfn)); 834 } 835 836 static void __init resource_init(void) 837 { 838 int i; 839 840 if (UNCAC_BASE != IO_BASE) 841 return; 842 843 code_resource.start = __pa_symbol(&_text); 844 code_resource.end = __pa_symbol(&_etext) - 1; 845 data_resource.start = __pa_symbol(&_etext); 846 data_resource.end = __pa_symbol(&_edata) - 1; 847 bss_resource.start = __pa_symbol(&__bss_start); 848 bss_resource.end = __pa_symbol(&__bss_stop) - 1; 849 850 for (i = 0; i < boot_mem_map.nr_map; i++) { 851 struct resource *res; 852 unsigned long start, end; 853 854 start = boot_mem_map.map[i].addr; 855 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1; 856 if (start >= HIGHMEM_START) 857 continue; 858 if (end >= HIGHMEM_START) 859 end = HIGHMEM_START - 1; 860 861 res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES); 862 if (!res) 863 panic("%s: Failed to allocate %zu bytes\n", __func__, 864 sizeof(struct resource)); 865 866 res->start = start; 867 res->end = end; 868 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; 869 870 switch (boot_mem_map.map[i].type) { 871 case BOOT_MEM_RAM: 872 case BOOT_MEM_INIT_RAM: 873 case BOOT_MEM_ROM_DATA: 874 res->name = "System RAM"; 875 res->flags |= IORESOURCE_SYSRAM; 876 break; 877 case BOOT_MEM_RESERVED: 878 case BOOT_MEM_NOMAP: 879 default: 880 res->name = "reserved"; 881 } 882 883 request_resource(&iomem_resource, res); 884 885 /* 886 * We don't know which RAM region contains kernel data, 887 * so we try it repeatedly and let the resource manager 888 * test it. 889 */ 890 request_resource(res, &code_resource); 891 request_resource(res, &data_resource); 892 request_resource(res, &bss_resource); 893 request_crashkernel(res); 894 } 895 } 896 897 #ifdef CONFIG_SMP 898 static void __init prefill_possible_map(void) 899 { 900 int i, possible = num_possible_cpus(); 901 902 if (possible > nr_cpu_ids) 903 possible = nr_cpu_ids; 904 905 for (i = 0; i < possible; i++) 906 set_cpu_possible(i, true); 907 for (; i < NR_CPUS; i++) 908 set_cpu_possible(i, false); 909 910 nr_cpu_ids = possible; 911 } 912 #else 913 static inline void prefill_possible_map(void) {} 914 #endif 915 916 void __init setup_arch(char **cmdline_p) 917 { 918 cpu_probe(); 919 mips_cm_probe(); 920 prom_init(); 921 922 setup_early_fdc_console(); 923 #ifdef CONFIG_EARLY_PRINTK 924 setup_early_printk(); 925 #endif 926 cpu_report(); 927 check_bugs_early(); 928 929 #if defined(CONFIG_VT) 930 #if defined(CONFIG_VGA_CONSOLE) 931 conswitchp = &vga_con; 932 #elif defined(CONFIG_DUMMY_CONSOLE) 933 conswitchp = &dummy_con; 934 #endif 935 #endif 936 937 arch_mem_init(cmdline_p); 938 939 resource_init(); 940 plat_smp_setup(); 941 prefill_possible_map(); 942 943 cpu_cache_init(); 944 paging_init(); 945 } 946 947 unsigned long kernelsp[NR_CPUS]; 948 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3; 949 950 #ifdef CONFIG_USE_OF 951 unsigned long fw_passed_dtb; 952 #endif 953 954 #ifdef CONFIG_DEBUG_FS 955 struct dentry *mips_debugfs_dir; 956 static int __init debugfs_mips(void) 957 { 958 mips_debugfs_dir = debugfs_create_dir("mips", NULL); 959 return 0; 960 } 961 arch_initcall(debugfs_mips); 962 #endif 963 964 #ifdef CONFIG_DMA_MAYBE_COHERENT 965 /* User defined DMA coherency from command line. */ 966 enum coherent_io_user_state coherentio = IO_COHERENCE_DEFAULT; 967 EXPORT_SYMBOL_GPL(coherentio); 968 int hw_coherentio = 0; /* Actual hardware supported DMA coherency setting. */ 969 970 static int __init setcoherentio(char *str) 971 { 972 coherentio = IO_COHERENCE_ENABLED; 973 pr_info("Hardware DMA cache coherency (command line)\n"); 974 return 0; 975 } 976 early_param("coherentio", setcoherentio); 977 978 static int __init setnocoherentio(char *str) 979 { 980 coherentio = IO_COHERENCE_DISABLED; 981 pr_info("Software DMA cache coherency (command line)\n"); 982 return 0; 983 } 984 early_param("nocoherentio", setnocoherentio); 985 #endif 986