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 31 #include <asm/addrspace.h> 32 #include <asm/bootinfo.h> 33 #include <asm/bugs.h> 34 #include <asm/cache.h> 35 #include <asm/cdmm.h> 36 #include <asm/cpu.h> 37 #include <asm/debug.h> 38 #include <asm/dma-coherence.h> 39 #include <asm/sections.h> 40 #include <asm/setup.h> 41 #include <asm/smp-ops.h> 42 #include <asm/prom.h> 43 44 #ifdef CONFIG_MIPS_ELF_APPENDED_DTB 45 const char __section(.appended_dtb) __appended_dtb[0x100000]; 46 #endif /* CONFIG_MIPS_ELF_APPENDED_DTB */ 47 48 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly; 49 50 EXPORT_SYMBOL(cpu_data); 51 52 #ifdef CONFIG_VT 53 struct screen_info screen_info; 54 #endif 55 56 /* 57 * Setup information 58 * 59 * These are initialized so they are in the .data section 60 */ 61 unsigned long mips_machtype __read_mostly = MACH_UNKNOWN; 62 63 EXPORT_SYMBOL(mips_machtype); 64 65 struct boot_mem_map boot_mem_map; 66 67 static char __initdata command_line[COMMAND_LINE_SIZE]; 68 char __initdata arcs_cmdline[COMMAND_LINE_SIZE]; 69 70 #ifdef CONFIG_CMDLINE_BOOL 71 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE; 72 #endif 73 74 /* 75 * mips_io_port_base is the begin of the address space to which x86 style 76 * I/O ports are mapped. 77 */ 78 const unsigned long mips_io_port_base = -1; 79 EXPORT_SYMBOL(mips_io_port_base); 80 81 static struct resource code_resource = { .name = "Kernel code", }; 82 static struct resource data_resource = { .name = "Kernel data", }; 83 static struct resource bss_resource = { .name = "Kernel bss", }; 84 85 static void *detect_magic __initdata = detect_memory_region; 86 87 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET 88 unsigned long ARCH_PFN_OFFSET; 89 EXPORT_SYMBOL(ARCH_PFN_OFFSET); 90 #endif 91 92 void __init add_memory_region(phys_addr_t start, phys_addr_t size, long type) 93 { 94 int x = boot_mem_map.nr_map; 95 int i; 96 97 /* 98 * If the region reaches the top of the physical address space, adjust 99 * the size slightly so that (start + size) doesn't overflow 100 */ 101 if (start + size - 1 == PHYS_ADDR_MAX) 102 --size; 103 104 /* Sanity check */ 105 if (start + size < start) { 106 pr_warn("Trying to add an invalid memory region, skipped\n"); 107 return; 108 } 109 110 /* 111 * Try to merge with existing entry, if any. 112 */ 113 for (i = 0; i < boot_mem_map.nr_map; i++) { 114 struct boot_mem_map_entry *entry = boot_mem_map.map + i; 115 unsigned long top; 116 117 if (entry->type != type) 118 continue; 119 120 if (start + size < entry->addr) 121 continue; /* no overlap */ 122 123 if (entry->addr + entry->size < start) 124 continue; /* no overlap */ 125 126 top = max(entry->addr + entry->size, start + size); 127 entry->addr = min(entry->addr, start); 128 entry->size = top - entry->addr; 129 130 return; 131 } 132 133 if (boot_mem_map.nr_map == BOOT_MEM_MAP_MAX) { 134 pr_err("Ooops! Too many entries in the memory map!\n"); 135 return; 136 } 137 138 boot_mem_map.map[x].addr = start; 139 boot_mem_map.map[x].size = size; 140 boot_mem_map.map[x].type = type; 141 boot_mem_map.nr_map++; 142 } 143 144 void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max) 145 { 146 void *dm = &detect_magic; 147 phys_addr_t size; 148 149 for (size = sz_min; size < sz_max; size <<= 1) { 150 if (!memcmp(dm, dm + size, sizeof(detect_magic))) 151 break; 152 } 153 154 pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n", 155 ((unsigned long long) size) / SZ_1M, 156 (unsigned long long) start, 157 ((unsigned long long) sz_min) / SZ_1M, 158 ((unsigned long long) sz_max) / SZ_1M); 159 160 add_memory_region(start, size, BOOT_MEM_RAM); 161 } 162 163 static bool __init __maybe_unused memory_region_available(phys_addr_t start, 164 phys_addr_t size) 165 { 166 int i; 167 bool in_ram = false, free = true; 168 169 for (i = 0; i < boot_mem_map.nr_map; i++) { 170 phys_addr_t start_, end_; 171 172 start_ = boot_mem_map.map[i].addr; 173 end_ = boot_mem_map.map[i].addr + boot_mem_map.map[i].size; 174 175 switch (boot_mem_map.map[i].type) { 176 case BOOT_MEM_RAM: 177 if (start >= start_ && start + size <= end_) 178 in_ram = true; 179 break; 180 case BOOT_MEM_RESERVED: 181 if ((start >= start_ && start < end_) || 182 (start < start_ && start + size >= start_)) 183 free = false; 184 break; 185 default: 186 continue; 187 } 188 } 189 190 return in_ram && free; 191 } 192 193 static void __init print_memory_map(void) 194 { 195 int i; 196 const int field = 2 * sizeof(unsigned long); 197 198 for (i = 0; i < boot_mem_map.nr_map; i++) { 199 printk(KERN_INFO " memory: %0*Lx @ %0*Lx ", 200 field, (unsigned long long) boot_mem_map.map[i].size, 201 field, (unsigned long long) boot_mem_map.map[i].addr); 202 203 switch (boot_mem_map.map[i].type) { 204 case BOOT_MEM_RAM: 205 printk(KERN_CONT "(usable)\n"); 206 break; 207 case BOOT_MEM_INIT_RAM: 208 printk(KERN_CONT "(usable after init)\n"); 209 break; 210 case BOOT_MEM_ROM_DATA: 211 printk(KERN_CONT "(ROM data)\n"); 212 break; 213 case BOOT_MEM_RESERVED: 214 printk(KERN_CONT "(reserved)\n"); 215 break; 216 default: 217 printk(KERN_CONT "type %lu\n", boot_mem_map.map[i].type); 218 break; 219 } 220 } 221 } 222 223 /* 224 * Manage initrd 225 */ 226 #ifdef CONFIG_BLK_DEV_INITRD 227 228 static int __init rd_start_early(char *p) 229 { 230 unsigned long start = memparse(p, &p); 231 232 #ifdef CONFIG_64BIT 233 /* Guess if the sign extension was forgotten by bootloader */ 234 if (start < XKPHYS) 235 start = (int)start; 236 #endif 237 initrd_start = start; 238 initrd_end += start; 239 return 0; 240 } 241 early_param("rd_start", rd_start_early); 242 243 static int __init rd_size_early(char *p) 244 { 245 initrd_end += memparse(p, &p); 246 return 0; 247 } 248 early_param("rd_size", rd_size_early); 249 250 /* it returns the next free pfn after initrd */ 251 static unsigned long __init init_initrd(void) 252 { 253 unsigned long end; 254 255 /* 256 * Board specific code or command line parser should have 257 * already set up initrd_start and initrd_end. In these cases 258 * perfom sanity checks and use them if all looks good. 259 */ 260 if (!initrd_start || initrd_end <= initrd_start) 261 goto disable; 262 263 if (initrd_start & ~PAGE_MASK) { 264 pr_err("initrd start must be page aligned\n"); 265 goto disable; 266 } 267 if (initrd_start < PAGE_OFFSET) { 268 pr_err("initrd start < PAGE_OFFSET\n"); 269 goto disable; 270 } 271 272 /* 273 * Sanitize initrd addresses. For example firmware 274 * can't guess if they need to pass them through 275 * 64-bits values if the kernel has been built in pure 276 * 32-bit. We need also to switch from KSEG0 to XKPHYS 277 * addresses now, so the code can now safely use __pa(). 278 */ 279 end = __pa(initrd_end); 280 initrd_end = (unsigned long)__va(end); 281 initrd_start = (unsigned long)__va(__pa(initrd_start)); 282 283 ROOT_DEV = Root_RAM0; 284 return PFN_UP(end); 285 disable: 286 initrd_start = 0; 287 initrd_end = 0; 288 return 0; 289 } 290 291 /* In some conditions (e.g. big endian bootloader with a little endian 292 kernel), the initrd might appear byte swapped. Try to detect this and 293 byte swap it if needed. */ 294 static void __init maybe_bswap_initrd(void) 295 { 296 #if defined(CONFIG_CPU_CAVIUM_OCTEON) 297 u64 buf; 298 299 /* Check for CPIO signature */ 300 if (!memcmp((void *)initrd_start, "070701", 6)) 301 return; 302 303 /* Check for compressed initrd */ 304 if (decompress_method((unsigned char *)initrd_start, 8, NULL)) 305 return; 306 307 /* Try again with a byte swapped header */ 308 buf = swab64p((u64 *)initrd_start); 309 if (!memcmp(&buf, "070701", 6) || 310 decompress_method((unsigned char *)(&buf), 8, NULL)) { 311 unsigned long i; 312 313 pr_info("Byteswapped initrd detected\n"); 314 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8) 315 swab64s((u64 *)i); 316 } 317 #endif 318 } 319 320 static void __init finalize_initrd(void) 321 { 322 unsigned long size = initrd_end - initrd_start; 323 324 if (size == 0) { 325 printk(KERN_INFO "Initrd not found or empty"); 326 goto disable; 327 } 328 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) { 329 printk(KERN_ERR "Initrd extends beyond end of memory"); 330 goto disable; 331 } 332 333 maybe_bswap_initrd(); 334 335 memblock_reserve(__pa(initrd_start), size); 336 initrd_below_start_ok = 1; 337 338 pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n", 339 initrd_start, size); 340 return; 341 disable: 342 printk(KERN_CONT " - disabling initrd\n"); 343 initrd_start = 0; 344 initrd_end = 0; 345 } 346 347 #else /* !CONFIG_BLK_DEV_INITRD */ 348 349 static unsigned long __init init_initrd(void) 350 { 351 return 0; 352 } 353 354 #define finalize_initrd() do {} while (0) 355 356 #endif 357 358 /* 359 * Initialize the bootmem allocator. It also setup initrd related data 360 * if needed. 361 */ 362 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON3) && defined(CONFIG_NUMA)) 363 364 static void __init bootmem_init(void) 365 { 366 init_initrd(); 367 finalize_initrd(); 368 } 369 370 #else /* !CONFIG_SGI_IP27 */ 371 372 static void __init bootmem_init(void) 373 { 374 unsigned long reserved_end; 375 phys_addr_t ramstart = PHYS_ADDR_MAX; 376 int i; 377 378 /* 379 * Sanity check any INITRD first. We don't take it into account 380 * for bootmem setup initially, rely on the end-of-kernel-code 381 * as our memory range starting point. Once bootmem is inited we 382 * will reserve the area used for the initrd. 383 */ 384 init_initrd(); 385 reserved_end = (unsigned long) PFN_UP(__pa_symbol(&_end)); 386 387 memblock_reserve(PHYS_OFFSET, reserved_end << PAGE_SHIFT); 388 389 /* 390 * max_low_pfn is not a number of pages. The number of pages 391 * of the system is given by 'max_low_pfn - min_low_pfn'. 392 */ 393 min_low_pfn = ~0UL; 394 max_low_pfn = 0; 395 396 /* 397 * Find the highest page frame number we have available 398 * and the lowest used RAM address 399 */ 400 for (i = 0; i < boot_mem_map.nr_map; i++) { 401 unsigned long start, end; 402 403 if (boot_mem_map.map[i].type != BOOT_MEM_RAM) 404 continue; 405 406 start = PFN_UP(boot_mem_map.map[i].addr); 407 end = PFN_DOWN(boot_mem_map.map[i].addr 408 + boot_mem_map.map[i].size); 409 410 ramstart = min(ramstart, boot_mem_map.map[i].addr); 411 412 #ifndef CONFIG_HIGHMEM 413 /* 414 * Skip highmem here so we get an accurate max_low_pfn if low 415 * memory stops short of high memory. 416 * If the region overlaps HIGHMEM_START, end is clipped so 417 * max_pfn excludes the highmem portion. 418 */ 419 if (start >= PFN_DOWN(HIGHMEM_START)) 420 continue; 421 if (end > PFN_DOWN(HIGHMEM_START)) 422 end = PFN_DOWN(HIGHMEM_START); 423 #endif 424 425 if (end > max_low_pfn) 426 max_low_pfn = end; 427 if (start < min_low_pfn) 428 min_low_pfn = start; 429 if (end <= reserved_end) 430 continue; 431 #ifdef CONFIG_BLK_DEV_INITRD 432 /* Skip zones before initrd and initrd itself */ 433 if (initrd_end && end <= (unsigned long)PFN_UP(__pa(initrd_end))) 434 continue; 435 #endif 436 } 437 438 if (min_low_pfn >= max_low_pfn) 439 panic("Incorrect memory mapping !!!"); 440 441 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET 442 ARCH_PFN_OFFSET = PFN_UP(ramstart); 443 #else 444 /* 445 * Reserve any memory between the start of RAM and PHYS_OFFSET 446 */ 447 if (ramstart > PHYS_OFFSET) { 448 add_memory_region(PHYS_OFFSET, ramstart - PHYS_OFFSET, 449 BOOT_MEM_RESERVED); 450 memblock_reserve(PHYS_OFFSET, ramstart - PHYS_OFFSET); 451 } 452 453 if (min_low_pfn > ARCH_PFN_OFFSET) { 454 pr_info("Wasting %lu bytes for tracking %lu unused pages\n", 455 (min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page), 456 min_low_pfn - ARCH_PFN_OFFSET); 457 } else if (ARCH_PFN_OFFSET - min_low_pfn > 0UL) { 458 pr_info("%lu free pages won't be used\n", 459 ARCH_PFN_OFFSET - min_low_pfn); 460 } 461 min_low_pfn = ARCH_PFN_OFFSET; 462 #endif 463 464 /* 465 * Determine low and high memory ranges 466 */ 467 max_pfn = max_low_pfn; 468 if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) { 469 #ifdef CONFIG_HIGHMEM 470 highstart_pfn = PFN_DOWN(HIGHMEM_START); 471 highend_pfn = max_low_pfn; 472 #endif 473 max_low_pfn = PFN_DOWN(HIGHMEM_START); 474 } 475 476 for (i = 0; i < boot_mem_map.nr_map; i++) { 477 unsigned long start, end; 478 479 start = PFN_UP(boot_mem_map.map[i].addr); 480 end = PFN_DOWN(boot_mem_map.map[i].addr 481 + boot_mem_map.map[i].size); 482 483 if (start <= min_low_pfn) 484 start = min_low_pfn; 485 if (start >= end) 486 continue; 487 488 #ifndef CONFIG_HIGHMEM 489 if (end > max_low_pfn) 490 end = max_low_pfn; 491 492 /* 493 * ... finally, is the area going away? 494 */ 495 if (end <= start) 496 continue; 497 #endif 498 499 memblock_add_node(PFN_PHYS(start), PFN_PHYS(end - start), 0); 500 } 501 502 /* 503 * Register fully available low RAM pages with the bootmem allocator. 504 */ 505 for (i = 0; i < boot_mem_map.nr_map; i++) { 506 unsigned long start, end, size; 507 508 start = PFN_UP(boot_mem_map.map[i].addr); 509 end = PFN_DOWN(boot_mem_map.map[i].addr 510 + boot_mem_map.map[i].size); 511 512 /* 513 * Reserve usable memory. 514 */ 515 switch (boot_mem_map.map[i].type) { 516 case BOOT_MEM_RAM: 517 break; 518 case BOOT_MEM_INIT_RAM: 519 memory_present(0, start, end); 520 continue; 521 default: 522 /* Not usable memory */ 523 if (start > min_low_pfn && end < max_low_pfn) 524 memblock_reserve(boot_mem_map.map[i].addr, 525 boot_mem_map.map[i].size); 526 527 continue; 528 } 529 530 /* 531 * We are rounding up the start address of usable memory 532 * and at the end of the usable range downwards. 533 */ 534 if (start >= max_low_pfn) 535 continue; 536 if (start < reserved_end) 537 start = reserved_end; 538 if (end > max_low_pfn) 539 end = max_low_pfn; 540 541 /* 542 * ... finally, is the area going away? 543 */ 544 if (end <= start) 545 continue; 546 size = end - start; 547 548 /* Register lowmem ranges */ 549 memory_present(0, start, end); 550 } 551 552 #ifdef CONFIG_RELOCATABLE 553 /* 554 * The kernel reserves all memory below its _end symbol as bootmem, 555 * but the kernel may now be at a much higher address. The memory 556 * between the original and new locations may be returned to the system. 557 */ 558 if (__pa_symbol(_text) > __pa_symbol(VMLINUX_LOAD_ADDRESS)) { 559 unsigned long offset; 560 extern void show_kernel_relocation(const char *level); 561 562 offset = __pa_symbol(_text) - __pa_symbol(VMLINUX_LOAD_ADDRESS); 563 memblock_free(__pa_symbol(VMLINUX_LOAD_ADDRESS), offset); 564 565 #if defined(CONFIG_DEBUG_KERNEL) && defined(CONFIG_DEBUG_INFO) 566 /* 567 * This information is necessary when debugging the kernel 568 * But is a security vulnerability otherwise! 569 */ 570 show_kernel_relocation(KERN_INFO); 571 #endif 572 } 573 #endif 574 575 /* 576 * Reserve initrd memory if needed. 577 */ 578 finalize_initrd(); 579 } 580 581 #endif /* CONFIG_SGI_IP27 */ 582 583 static int usermem __initdata; 584 585 static int __init early_parse_mem(char *p) 586 { 587 phys_addr_t start, size; 588 589 /* 590 * If a user specifies memory size, we 591 * blow away any automatically generated 592 * size. 593 */ 594 if (usermem == 0) { 595 boot_mem_map.nr_map = 0; 596 usermem = 1; 597 } 598 start = 0; 599 size = memparse(p, &p); 600 if (*p == '@') 601 start = memparse(p + 1, &p); 602 603 add_memory_region(start, size, BOOT_MEM_RAM); 604 605 return 0; 606 } 607 early_param("mem", early_parse_mem); 608 609 static int __init early_parse_memmap(char *p) 610 { 611 char *oldp; 612 u64 start_at, mem_size; 613 614 if (!p) 615 return -EINVAL; 616 617 if (!strncmp(p, "exactmap", 8)) { 618 pr_err("\"memmap=exactmap\" invalid on MIPS\n"); 619 return 0; 620 } 621 622 oldp = p; 623 mem_size = memparse(p, &p); 624 if (p == oldp) 625 return -EINVAL; 626 627 if (*p == '@') { 628 start_at = memparse(p+1, &p); 629 add_memory_region(start_at, mem_size, BOOT_MEM_RAM); 630 } else if (*p == '#') { 631 pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n"); 632 return -EINVAL; 633 } else if (*p == '$') { 634 start_at = memparse(p+1, &p); 635 add_memory_region(start_at, mem_size, BOOT_MEM_RESERVED); 636 } else { 637 pr_err("\"memmap\" invalid format!\n"); 638 return -EINVAL; 639 } 640 641 if (*p == '\0') { 642 usermem = 1; 643 return 0; 644 } else 645 return -EINVAL; 646 } 647 early_param("memmap", early_parse_memmap); 648 649 #ifdef CONFIG_PROC_VMCORE 650 unsigned long setup_elfcorehdr, setup_elfcorehdr_size; 651 static int __init early_parse_elfcorehdr(char *p) 652 { 653 int i; 654 655 setup_elfcorehdr = memparse(p, &p); 656 657 for (i = 0; i < boot_mem_map.nr_map; i++) { 658 unsigned long start = boot_mem_map.map[i].addr; 659 unsigned long end = (boot_mem_map.map[i].addr + 660 boot_mem_map.map[i].size); 661 if (setup_elfcorehdr >= start && setup_elfcorehdr < end) { 662 /* 663 * Reserve from the elf core header to the end of 664 * the memory segment, that should all be kdump 665 * reserved memory. 666 */ 667 setup_elfcorehdr_size = end - setup_elfcorehdr; 668 break; 669 } 670 } 671 /* 672 * If we don't find it in the memory map, then we shouldn't 673 * have to worry about it, as the new kernel won't use it. 674 */ 675 return 0; 676 } 677 early_param("elfcorehdr", early_parse_elfcorehdr); 678 #endif 679 680 static void __init arch_mem_addpart(phys_addr_t mem, phys_addr_t end, int type) 681 { 682 phys_addr_t size; 683 int i; 684 685 size = end - mem; 686 if (!size) 687 return; 688 689 /* Make sure it is in the boot_mem_map */ 690 for (i = 0; i < boot_mem_map.nr_map; i++) { 691 if (mem >= boot_mem_map.map[i].addr && 692 mem < (boot_mem_map.map[i].addr + 693 boot_mem_map.map[i].size)) 694 return; 695 } 696 add_memory_region(mem, size, type); 697 } 698 699 #ifdef CONFIG_KEXEC 700 static inline unsigned long long get_total_mem(void) 701 { 702 unsigned long long total; 703 704 total = max_pfn - min_low_pfn; 705 return total << PAGE_SHIFT; 706 } 707 708 static void __init mips_parse_crashkernel(void) 709 { 710 unsigned long long total_mem; 711 unsigned long long crash_size, crash_base; 712 int ret; 713 714 total_mem = get_total_mem(); 715 ret = parse_crashkernel(boot_command_line, total_mem, 716 &crash_size, &crash_base); 717 if (ret != 0 || crash_size <= 0) 718 return; 719 720 if (!memory_region_available(crash_base, crash_size)) { 721 pr_warn("Invalid memory region reserved for crash kernel\n"); 722 return; 723 } 724 725 crashk_res.start = crash_base; 726 crashk_res.end = crash_base + crash_size - 1; 727 } 728 729 static void __init request_crashkernel(struct resource *res) 730 { 731 int ret; 732 733 if (crashk_res.start == crashk_res.end) 734 return; 735 736 ret = request_resource(res, &crashk_res); 737 if (!ret) 738 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n", 739 (unsigned long)((crashk_res.end - 740 crashk_res.start + 1) >> 20), 741 (unsigned long)(crashk_res.start >> 20)); 742 } 743 #else /* !defined(CONFIG_KEXEC) */ 744 static void __init mips_parse_crashkernel(void) 745 { 746 } 747 748 static void __init request_crashkernel(struct resource *res) 749 { 750 } 751 #endif /* !defined(CONFIG_KEXEC) */ 752 753 #define USE_PROM_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_BOOTLOADER) 754 #define USE_DTB_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB) 755 #define EXTEND_WITH_PROM IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND) 756 #define BUILTIN_EXTEND_WITH_PROM \ 757 IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND) 758 759 /* 760 * arch_mem_init - initialize memory management subsystem 761 * 762 * o plat_mem_setup() detects the memory configuration and will record detected 763 * memory areas using add_memory_region. 764 * 765 * At this stage the memory configuration of the system is known to the 766 * kernel but generic memory management system is still entirely uninitialized. 767 * 768 * o bootmem_init() 769 * o sparse_init() 770 * o paging_init() 771 * o dma_contiguous_reserve() 772 * 773 * At this stage the bootmem allocator is ready to use. 774 * 775 * NOTE: historically plat_mem_setup did the entire platform initialization. 776 * This was rather impractical because it meant plat_mem_setup had to 777 * get away without any kind of memory allocator. To keep old code from 778 * breaking plat_setup was just renamed to plat_mem_setup and a second platform 779 * initialization hook for anything else was introduced. 780 */ 781 static void __init arch_mem_init(char **cmdline_p) 782 { 783 struct memblock_region *reg; 784 extern void plat_mem_setup(void); 785 786 /* 787 * Initialize boot_command_line to an innocuous but non-empty string in 788 * order to prevent early_init_dt_scan_chosen() from copying 789 * CONFIG_CMDLINE into it without our knowledge. We handle 790 * CONFIG_CMDLINE ourselves below & don't want to duplicate its 791 * content because repeating arguments can be problematic. 792 */ 793 strlcpy(boot_command_line, " ", COMMAND_LINE_SIZE); 794 795 /* call board setup routine */ 796 plat_mem_setup(); 797 798 /* 799 * Make sure all kernel memory is in the maps. The "UP" and 800 * "DOWN" are opposite for initdata since if it crosses over 801 * into another memory section you don't want that to be 802 * freed when the initdata is freed. 803 */ 804 arch_mem_addpart(PFN_DOWN(__pa_symbol(&_text)) << PAGE_SHIFT, 805 PFN_UP(__pa_symbol(&_edata)) << PAGE_SHIFT, 806 BOOT_MEM_RAM); 807 arch_mem_addpart(PFN_UP(__pa_symbol(&__init_begin)) << PAGE_SHIFT, 808 PFN_DOWN(__pa_symbol(&__init_end)) << PAGE_SHIFT, 809 BOOT_MEM_INIT_RAM); 810 811 pr_info("Determined physical RAM map:\n"); 812 print_memory_map(); 813 814 #if defined(CONFIG_CMDLINE_BOOL) && defined(CONFIG_CMDLINE_OVERRIDE) 815 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); 816 #else 817 if ((USE_PROM_CMDLINE && arcs_cmdline[0]) || 818 (USE_DTB_CMDLINE && !boot_command_line[0])) 819 strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE); 820 821 if (EXTEND_WITH_PROM && arcs_cmdline[0]) { 822 if (boot_command_line[0]) 823 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE); 824 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE); 825 } 826 827 #if defined(CONFIG_CMDLINE_BOOL) 828 if (builtin_cmdline[0]) { 829 if (boot_command_line[0]) 830 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE); 831 strlcat(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); 832 } 833 834 if (BUILTIN_EXTEND_WITH_PROM && arcs_cmdline[0]) { 835 if (boot_command_line[0]) 836 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE); 837 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE); 838 } 839 #endif 840 #endif 841 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE); 842 843 *cmdline_p = command_line; 844 845 parse_early_param(); 846 847 if (usermem) { 848 pr_info("User-defined physical RAM map:\n"); 849 print_memory_map(); 850 } 851 852 early_init_fdt_reserve_self(); 853 early_init_fdt_scan_reserved_mem(); 854 855 bootmem_init(); 856 857 /* 858 * Prevent memblock from allocating high memory. 859 * This cannot be done before max_low_pfn is detected, so up 860 * to this point is possible to only reserve physical memory 861 * with memblock_reserve; memblock_alloc* can be used 862 * only after this point 863 */ 864 memblock_set_current_limit(PFN_PHYS(max_low_pfn)); 865 866 #ifdef CONFIG_PROC_VMCORE 867 if (setup_elfcorehdr && setup_elfcorehdr_size) { 868 printk(KERN_INFO "kdump reserved memory at %lx-%lx\n", 869 setup_elfcorehdr, setup_elfcorehdr_size); 870 memblock_reserve(setup_elfcorehdr, setup_elfcorehdr_size); 871 } 872 #endif 873 874 mips_parse_crashkernel(); 875 #ifdef CONFIG_KEXEC 876 if (crashk_res.start != crashk_res.end) 877 memblock_reserve(crashk_res.start, 878 crashk_res.end - crashk_res.start + 1); 879 #endif 880 device_tree_init(); 881 sparse_init(); 882 plat_swiotlb_setup(); 883 884 dma_contiguous_reserve(PFN_PHYS(max_low_pfn)); 885 /* Tell bootmem about cma reserved memblock section */ 886 for_each_memblock(reserved, reg) 887 if (reg->size != 0) 888 memblock_reserve(reg->base, reg->size); 889 890 reserve_bootmem_region(__pa_symbol(&__nosave_begin), 891 __pa_symbol(&__nosave_end)); /* Reserve for hibernation */ 892 } 893 894 static void __init resource_init(void) 895 { 896 int i; 897 898 if (UNCAC_BASE != IO_BASE) 899 return; 900 901 code_resource.start = __pa_symbol(&_text); 902 code_resource.end = __pa_symbol(&_etext) - 1; 903 data_resource.start = __pa_symbol(&_etext); 904 data_resource.end = __pa_symbol(&_edata) - 1; 905 bss_resource.start = __pa_symbol(&__bss_start); 906 bss_resource.end = __pa_symbol(&__bss_stop) - 1; 907 908 for (i = 0; i < boot_mem_map.nr_map; i++) { 909 struct resource *res; 910 unsigned long start, end; 911 912 start = boot_mem_map.map[i].addr; 913 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1; 914 if (start >= HIGHMEM_START) 915 continue; 916 if (end >= HIGHMEM_START) 917 end = HIGHMEM_START - 1; 918 919 res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES); 920 921 res->start = start; 922 res->end = end; 923 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; 924 925 switch (boot_mem_map.map[i].type) { 926 case BOOT_MEM_RAM: 927 case BOOT_MEM_INIT_RAM: 928 case BOOT_MEM_ROM_DATA: 929 res->name = "System RAM"; 930 res->flags |= IORESOURCE_SYSRAM; 931 break; 932 case BOOT_MEM_RESERVED: 933 default: 934 res->name = "reserved"; 935 } 936 937 request_resource(&iomem_resource, res); 938 939 /* 940 * We don't know which RAM region contains kernel data, 941 * so we try it repeatedly and let the resource manager 942 * test it. 943 */ 944 request_resource(res, &code_resource); 945 request_resource(res, &data_resource); 946 request_resource(res, &bss_resource); 947 request_crashkernel(res); 948 } 949 } 950 951 #ifdef CONFIG_SMP 952 static void __init prefill_possible_map(void) 953 { 954 int i, possible = num_possible_cpus(); 955 956 if (possible > nr_cpu_ids) 957 possible = nr_cpu_ids; 958 959 for (i = 0; i < possible; i++) 960 set_cpu_possible(i, true); 961 for (; i < NR_CPUS; i++) 962 set_cpu_possible(i, false); 963 964 nr_cpu_ids = possible; 965 } 966 #else 967 static inline void prefill_possible_map(void) {} 968 #endif 969 970 void __init setup_arch(char **cmdline_p) 971 { 972 cpu_probe(); 973 mips_cm_probe(); 974 prom_init(); 975 976 setup_early_fdc_console(); 977 #ifdef CONFIG_EARLY_PRINTK 978 setup_early_printk(); 979 #endif 980 cpu_report(); 981 check_bugs_early(); 982 983 #if defined(CONFIG_VT) 984 #if defined(CONFIG_VGA_CONSOLE) 985 conswitchp = &vga_con; 986 #elif defined(CONFIG_DUMMY_CONSOLE) 987 conswitchp = &dummy_con; 988 #endif 989 #endif 990 991 arch_mem_init(cmdline_p); 992 993 resource_init(); 994 plat_smp_setup(); 995 prefill_possible_map(); 996 997 cpu_cache_init(); 998 paging_init(); 999 } 1000 1001 unsigned long kernelsp[NR_CPUS]; 1002 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3; 1003 1004 #ifdef CONFIG_USE_OF 1005 unsigned long fw_passed_dtb; 1006 #endif 1007 1008 #ifdef CONFIG_DEBUG_FS 1009 struct dentry *mips_debugfs_dir; 1010 static int __init debugfs_mips(void) 1011 { 1012 struct dentry *d; 1013 1014 d = debugfs_create_dir("mips", NULL); 1015 if (!d) 1016 return -ENOMEM; 1017 mips_debugfs_dir = d; 1018 return 0; 1019 } 1020 arch_initcall(debugfs_mips); 1021 #endif 1022 1023 #ifdef CONFIG_DMA_MAYBE_COHERENT 1024 /* User defined DMA coherency from command line. */ 1025 enum coherent_io_user_state coherentio = IO_COHERENCE_DEFAULT; 1026 EXPORT_SYMBOL_GPL(coherentio); 1027 int hw_coherentio = 0; /* Actual hardware supported DMA coherency setting. */ 1028 1029 static int __init setcoherentio(char *str) 1030 { 1031 coherentio = IO_COHERENCE_ENABLED; 1032 pr_info("Hardware DMA cache coherency (command line)\n"); 1033 return 0; 1034 } 1035 early_param("coherentio", setcoherentio); 1036 1037 static int __init setnocoherentio(char *str) 1038 { 1039 coherentio = IO_COHERENCE_DISABLED; 1040 pr_info("Software DMA cache coherency (command line)\n"); 1041 return 0; 1042 } 1043 early_param("nocoherentio", setnocoherentio); 1044 #endif 1045