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/cpu.h> 15 #include <linux/delay.h> 16 #include <linux/ioport.h> 17 #include <linux/export.h> 18 #include <linux/memblock.h> 19 #include <linux/initrd.h> 20 #include <linux/root_dev.h> 21 #include <linux/highmem.h> 22 #include <linux/console.h> 23 #include <linux/pfn.h> 24 #include <linux/debugfs.h> 25 #include <linux/kexec.h> 26 #include <linux/sizes.h> 27 #include <linux/device.h> 28 #include <linux/dma-map-ops.h> 29 #include <linux/decompress/generic.h> 30 #include <linux/of_fdt.h> 31 #include <linux/dmi.h> 32 #include <linux/crash_dump.h> 33 34 #include <asm/addrspace.h> 35 #include <asm/bootinfo.h> 36 #include <asm/bugs.h> 37 #include <asm/cache.h> 38 #include <asm/cdmm.h> 39 #include <asm/cpu.h> 40 #include <asm/debug.h> 41 #include <asm/mmzone.h> 42 #include <asm/sections.h> 43 #include <asm/setup.h> 44 #include <asm/smp-ops.h> 45 #include <asm/mips-cps.h> 46 #include <asm/prom.h> 47 #include <asm/fw/fw.h> 48 49 #ifdef CONFIG_MIPS_ELF_APPENDED_DTB 50 char __section(".appended_dtb") __appended_dtb[0x100000]; 51 #endif /* CONFIG_MIPS_ELF_APPENDED_DTB */ 52 53 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly; 54 55 EXPORT_SYMBOL(cpu_data); 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 const char builtin_cmdline[] __initconst = CONFIG_CMDLINE; 71 #else 72 static const char builtin_cmdline[] __initconst = ""; 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 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 unsigned long __kaslr_offset __ro_after_init; 87 EXPORT_SYMBOL(__kaslr_offset); 88 89 static void *detect_magic __initdata = detect_memory_region; 90 91 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET 92 unsigned long ARCH_PFN_OFFSET; 93 EXPORT_SYMBOL(ARCH_PFN_OFFSET); 94 #endif 95 96 void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max) 97 { 98 void *dm = &detect_magic; 99 phys_addr_t size; 100 101 for (size = sz_min; size < sz_max; size <<= 1) { 102 if (!memcmp(dm, dm + size, sizeof(detect_magic))) 103 break; 104 } 105 106 pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n", 107 ((unsigned long long) size) / SZ_1M, 108 (unsigned long long) start, 109 ((unsigned long long) sz_min) / SZ_1M, 110 ((unsigned long long) sz_max) / SZ_1M); 111 112 memblock_add(start, size); 113 } 114 115 /* 116 * Manage initrd 117 */ 118 #ifdef CONFIG_BLK_DEV_INITRD 119 120 static int __init rd_start_early(char *p) 121 { 122 unsigned long start = memparse(p, &p); 123 124 #ifdef CONFIG_64BIT 125 /* Guess if the sign extension was forgotten by bootloader */ 126 if (start < XKPHYS) 127 start = (int)start; 128 #endif 129 initrd_start = start; 130 initrd_end += start; 131 return 0; 132 } 133 early_param("rd_start", rd_start_early); 134 135 static int __init rd_size_early(char *p) 136 { 137 initrd_end += memparse(p, &p); 138 return 0; 139 } 140 early_param("rd_size", rd_size_early); 141 142 /* it returns the next free pfn after initrd */ 143 static unsigned long __init init_initrd(void) 144 { 145 unsigned long end; 146 147 /* 148 * Board specific code or command line parser should have 149 * already set up initrd_start and initrd_end. In these cases 150 * perform sanity checks and use them if all looks good. 151 */ 152 if (!initrd_start || initrd_end <= initrd_start) 153 goto disable; 154 155 if (initrd_start & ~PAGE_MASK) { 156 pr_err("initrd start must be page aligned\n"); 157 goto disable; 158 } 159 160 /* 161 * Sanitize initrd addresses. For example firmware 162 * can't guess if they need to pass them through 163 * 64-bits values if the kernel has been built in pure 164 * 32-bit. We need also to switch from KSEG0 to XKPHYS 165 * addresses now, so the code can now safely use __pa(). 166 */ 167 end = __pa(initrd_end); 168 initrd_end = (unsigned long)__va(end); 169 initrd_start = (unsigned long)__va(__pa(initrd_start)); 170 171 if (initrd_start < PAGE_OFFSET) { 172 pr_err("initrd start < PAGE_OFFSET\n"); 173 goto disable; 174 } 175 176 ROOT_DEV = Root_RAM0; 177 return PFN_UP(end); 178 disable: 179 initrd_start = 0; 180 initrd_end = 0; 181 return 0; 182 } 183 184 /* In some conditions (e.g. big endian bootloader with a little endian 185 kernel), the initrd might appear byte swapped. Try to detect this and 186 byte swap it if needed. */ 187 static void __init maybe_bswap_initrd(void) 188 { 189 #if defined(CONFIG_CPU_CAVIUM_OCTEON) 190 u64 buf; 191 192 /* Check for CPIO signature */ 193 if (!memcmp((void *)initrd_start, "070701", 6)) 194 return; 195 196 /* Check for compressed initrd */ 197 if (decompress_method((unsigned char *)initrd_start, 8, NULL)) 198 return; 199 200 /* Try again with a byte swapped header */ 201 buf = swab64p((u64 *)initrd_start); 202 if (!memcmp(&buf, "070701", 6) || 203 decompress_method((unsigned char *)(&buf), 8, NULL)) { 204 unsigned long i; 205 206 pr_info("Byteswapped initrd detected\n"); 207 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8) 208 swab64s((u64 *)i); 209 } 210 #endif 211 } 212 213 static void __init finalize_initrd(void) 214 { 215 unsigned long size = initrd_end - initrd_start; 216 217 if (size == 0) { 218 printk(KERN_INFO "Initrd not found or empty"); 219 goto disable; 220 } 221 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) { 222 printk(KERN_ERR "Initrd extends beyond end of memory"); 223 goto disable; 224 } 225 226 maybe_bswap_initrd(); 227 228 memblock_reserve(__pa(initrd_start), size); 229 initrd_below_start_ok = 1; 230 231 pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n", 232 initrd_start, size); 233 return; 234 disable: 235 printk(KERN_CONT " - disabling initrd\n"); 236 initrd_start = 0; 237 initrd_end = 0; 238 } 239 240 #else /* !CONFIG_BLK_DEV_INITRD */ 241 242 static unsigned long __init init_initrd(void) 243 { 244 return 0; 245 } 246 247 #define finalize_initrd() do {} while (0) 248 249 #endif 250 251 /* 252 * Initialize the bootmem allocator. It also setup initrd related data 253 * if needed. 254 */ 255 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON64) && defined(CONFIG_NUMA)) 256 257 static void __init bootmem_init(void) 258 { 259 init_initrd(); 260 finalize_initrd(); 261 } 262 263 #else /* !CONFIG_SGI_IP27 */ 264 265 static void __init bootmem_init(void) 266 { 267 phys_addr_t ramstart, ramend; 268 unsigned long start, end; 269 int i; 270 271 ramstart = memblock_start_of_DRAM(); 272 ramend = memblock_end_of_DRAM(); 273 274 /* 275 * Sanity check any INITRD first. We don't take it into account 276 * for bootmem setup initially, rely on the end-of-kernel-code 277 * as our memory range starting point. Once bootmem is inited we 278 * will reserve the area used for the initrd. 279 */ 280 init_initrd(); 281 282 /* Reserve memory occupied by kernel. */ 283 memblock_reserve(__pa_symbol(&_text), 284 __pa_symbol(&_end) - __pa_symbol(&_text)); 285 286 /* max_low_pfn is not a number of pages but the end pfn of low mem */ 287 288 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET 289 ARCH_PFN_OFFSET = PFN_UP(ramstart); 290 #else 291 /* 292 * Reserve any memory between the start of RAM and PHYS_OFFSET 293 */ 294 if (ramstart > PHYS_OFFSET) 295 memblock_reserve(PHYS_OFFSET, ramstart - PHYS_OFFSET); 296 297 if (PFN_UP(ramstart) > ARCH_PFN_OFFSET) { 298 pr_info("Wasting %lu bytes for tracking %lu unused pages\n", 299 (unsigned long)((PFN_UP(ramstart) - ARCH_PFN_OFFSET) * sizeof(struct page)), 300 (unsigned long)(PFN_UP(ramstart) - ARCH_PFN_OFFSET)); 301 } 302 #endif 303 304 min_low_pfn = ARCH_PFN_OFFSET; 305 max_pfn = PFN_DOWN(ramend); 306 for_each_mem_pfn_range(i, MAX_NUMNODES, &start, &end, NULL) { 307 /* 308 * Skip highmem here so we get an accurate max_low_pfn if low 309 * memory stops short of high memory. 310 * If the region overlaps HIGHMEM_START, end is clipped so 311 * max_pfn excludes the highmem portion. 312 */ 313 if (start >= PFN_DOWN(HIGHMEM_START)) 314 continue; 315 if (end > PFN_DOWN(HIGHMEM_START)) 316 end = PFN_DOWN(HIGHMEM_START); 317 if (end > max_low_pfn) 318 max_low_pfn = end; 319 } 320 321 if (min_low_pfn >= max_low_pfn) 322 panic("Incorrect memory mapping !!!"); 323 324 if (max_pfn > PFN_DOWN(HIGHMEM_START)) { 325 max_low_pfn = PFN_DOWN(HIGHMEM_START); 326 #ifdef CONFIG_HIGHMEM 327 highstart_pfn = max_low_pfn; 328 highend_pfn = max_pfn; 329 #else 330 max_pfn = max_low_pfn; 331 #endif 332 } 333 334 /* 335 * Reserve initrd memory if needed. 336 */ 337 finalize_initrd(); 338 } 339 340 #endif /* CONFIG_SGI_IP27 */ 341 342 static int usermem __initdata; 343 344 static int __init early_parse_mem(char *p) 345 { 346 phys_addr_t start, size; 347 348 if (!p) { 349 pr_err("mem parameter is empty, do nothing\n"); 350 return -EINVAL; 351 } 352 353 /* 354 * If a user specifies memory size, we 355 * blow away any automatically generated 356 * size. 357 */ 358 if (usermem == 0) { 359 usermem = 1; 360 memblock_remove(memblock_start_of_DRAM(), 361 memblock_end_of_DRAM() - memblock_start_of_DRAM()); 362 } 363 start = 0; 364 size = memparse(p, &p); 365 if (*p == '@') 366 start = memparse(p + 1, &p); 367 368 if (IS_ENABLED(CONFIG_NUMA)) 369 memblock_add_node(start, size, pa_to_nid(start), MEMBLOCK_NONE); 370 else 371 memblock_add(start, size); 372 373 return 0; 374 } 375 early_param("mem", early_parse_mem); 376 377 static int __init early_parse_memmap(char *p) 378 { 379 char *oldp; 380 u64 start_at, mem_size; 381 382 if (!p) 383 return -EINVAL; 384 385 if (!strncmp(p, "exactmap", 8)) { 386 pr_err("\"memmap=exactmap\" invalid on MIPS\n"); 387 return 0; 388 } 389 390 oldp = p; 391 mem_size = memparse(p, &p); 392 if (p == oldp) 393 return -EINVAL; 394 395 if (*p == '@') { 396 start_at = memparse(p+1, &p); 397 memblock_add(start_at, mem_size); 398 } else if (*p == '#') { 399 pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n"); 400 return -EINVAL; 401 } else if (*p == '$') { 402 start_at = memparse(p+1, &p); 403 memblock_add(start_at, mem_size); 404 memblock_reserve(start_at, mem_size); 405 } else { 406 pr_err("\"memmap\" invalid format!\n"); 407 return -EINVAL; 408 } 409 410 if (*p == '\0') { 411 usermem = 1; 412 return 0; 413 } else 414 return -EINVAL; 415 } 416 early_param("memmap", early_parse_memmap); 417 418 static void __init mips_reserve_vmcore(void) 419 { 420 #ifdef CONFIG_PROC_VMCORE 421 phys_addr_t start, end; 422 u64 i; 423 424 if (!elfcorehdr_size) { 425 for_each_mem_range(i, &start, &end) { 426 if (elfcorehdr_addr >= start && elfcorehdr_addr < end) { 427 /* 428 * Reserve from the elf core header to the end of 429 * the memory segment, that should all be kdump 430 * reserved memory. 431 */ 432 elfcorehdr_size = end - elfcorehdr_addr; 433 break; 434 } 435 } 436 } 437 438 pr_info("Reserving %ldKB of memory at %ldKB for kdump\n", 439 (unsigned long)elfcorehdr_size >> 10, (unsigned long)elfcorehdr_addr >> 10); 440 441 memblock_reserve(elfcorehdr_addr, elfcorehdr_size); 442 #endif 443 } 444 445 #ifdef CONFIG_KEXEC 446 447 /* 64M alignment for crash kernel regions */ 448 #define CRASH_ALIGN SZ_64M 449 #define CRASH_ADDR_MAX SZ_512M 450 451 static void __init mips_parse_crashkernel(void) 452 { 453 unsigned long long total_mem; 454 unsigned long long crash_size, crash_base; 455 int ret; 456 457 total_mem = memblock_phys_mem_size(); 458 ret = parse_crashkernel(boot_command_line, total_mem, 459 &crash_size, &crash_base, 460 NULL, NULL); 461 if (ret != 0 || crash_size <= 0) 462 return; 463 464 if (crash_base <= 0) { 465 crash_base = memblock_phys_alloc_range(crash_size, CRASH_ALIGN, 466 CRASH_ALIGN, 467 CRASH_ADDR_MAX); 468 if (!crash_base) { 469 pr_warn("crashkernel reservation failed - No suitable area found.\n"); 470 return; 471 } 472 } else { 473 unsigned long long start; 474 475 start = memblock_phys_alloc_range(crash_size, 1, 476 crash_base, 477 crash_base + crash_size); 478 if (start != crash_base) { 479 pr_warn("Invalid memory region reserved for crash kernel\n"); 480 return; 481 } 482 } 483 484 crashk_res.start = crash_base; 485 crashk_res.end = crash_base + crash_size - 1; 486 } 487 488 static void __init request_crashkernel(struct resource *res) 489 { 490 int ret; 491 492 if (crashk_res.start == crashk_res.end) 493 return; 494 495 ret = request_resource(res, &crashk_res); 496 if (!ret) 497 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n", 498 (unsigned long)(resource_size(&crashk_res) >> 20), 499 (unsigned long)(crashk_res.start >> 20)); 500 } 501 #else /* !defined(CONFIG_KEXEC) */ 502 static void __init mips_parse_crashkernel(void) 503 { 504 } 505 506 static void __init request_crashkernel(struct resource *res) 507 { 508 } 509 #endif /* !defined(CONFIG_KEXEC) */ 510 511 static void __init check_kernel_sections_mem(void) 512 { 513 phys_addr_t start = __pa_symbol(&_text); 514 phys_addr_t size = __pa_symbol(&_end) - start; 515 516 if (!memblock_is_region_memory(start, size)) { 517 pr_info("Kernel sections are not in the memory maps\n"); 518 memblock_add(start, size); 519 } 520 } 521 522 static void __init bootcmdline_append(const char *s, size_t max) 523 { 524 if (!s[0] || !max) 525 return; 526 527 if (boot_command_line[0]) 528 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE); 529 530 strlcat(boot_command_line, s, max); 531 } 532 533 #ifdef CONFIG_OF_EARLY_FLATTREE 534 535 static int __init bootcmdline_scan_chosen(unsigned long node, const char *uname, 536 int depth, void *data) 537 { 538 bool *dt_bootargs = data; 539 const char *p; 540 int l; 541 542 if (depth != 1 || !data || 543 (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0)) 544 return 0; 545 546 p = of_get_flat_dt_prop(node, "bootargs", &l); 547 if (p != NULL && l > 0) { 548 bootcmdline_append(p, min(l, COMMAND_LINE_SIZE)); 549 *dt_bootargs = true; 550 } 551 552 return 1; 553 } 554 555 #endif /* CONFIG_OF_EARLY_FLATTREE */ 556 557 static void __init bootcmdline_init(void) 558 { 559 bool dt_bootargs = false; 560 561 /* 562 * If CMDLINE_OVERRIDE is enabled then initializing the command line is 563 * trivial - we simply use the built-in command line unconditionally & 564 * unmodified. 565 */ 566 if (IS_ENABLED(CONFIG_CMDLINE_OVERRIDE)) { 567 strscpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); 568 return; 569 } 570 571 /* 572 * If the user specified a built-in command line & 573 * MIPS_CMDLINE_BUILTIN_EXTEND, then the built-in command line is 574 * prepended to arguments from the bootloader or DT so we'll copy them 575 * to the start of boot_command_line here. Otherwise, empty 576 * boot_command_line to undo anything early_init_dt_scan_chosen() did. 577 */ 578 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND)) 579 strscpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); 580 else 581 boot_command_line[0] = 0; 582 583 #ifdef CONFIG_OF_EARLY_FLATTREE 584 /* 585 * If we're configured to take boot arguments from DT, look for those 586 * now. 587 */ 588 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB) || 589 IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND)) 590 of_scan_flat_dt(bootcmdline_scan_chosen, &dt_bootargs); 591 #endif 592 593 /* 594 * If we didn't get any arguments from DT (regardless of whether that's 595 * because we weren't configured to look for them, or because we looked 596 * & found none) then we'll take arguments from the bootloader. 597 * plat_mem_setup() should have filled arcs_cmdline with arguments from 598 * the bootloader. 599 */ 600 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND) || !dt_bootargs) 601 bootcmdline_append(arcs_cmdline, COMMAND_LINE_SIZE); 602 603 /* 604 * If the user specified a built-in command line & we didn't already 605 * prepend it, we append it to boot_command_line here. 606 */ 607 if (IS_ENABLED(CONFIG_CMDLINE_BOOL) && 608 !IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND)) 609 bootcmdline_append(builtin_cmdline, COMMAND_LINE_SIZE); 610 } 611 612 /* 613 * arch_mem_init - initialize memory management subsystem 614 * 615 * o plat_mem_setup() detects the memory configuration and will record detected 616 * memory areas using memblock_add. 617 * 618 * At this stage the memory configuration of the system is known to the 619 * kernel but generic memory management system is still entirely uninitialized. 620 * 621 * o bootmem_init() 622 * o sparse_init() 623 * o paging_init() 624 * o dma_contiguous_reserve() 625 * 626 * At this stage the bootmem allocator is ready to use. 627 * 628 * NOTE: historically plat_mem_setup did the entire platform initialization. 629 * This was rather impractical because it meant plat_mem_setup had to 630 * get away without any kind of memory allocator. To keep old code from 631 * breaking plat_setup was just renamed to plat_mem_setup and a second platform 632 * initialization hook for anything else was introduced. 633 */ 634 static void __init arch_mem_init(char **cmdline_p) 635 { 636 /* call board setup routine */ 637 plat_mem_setup(); 638 memblock_set_bottom_up(true); 639 640 bootcmdline_init(); 641 strscpy(command_line, boot_command_line, COMMAND_LINE_SIZE); 642 *cmdline_p = command_line; 643 644 parse_early_param(); 645 646 if (usermem) 647 pr_info("User-defined physical RAM map overwrite\n"); 648 649 check_kernel_sections_mem(); 650 651 early_init_fdt_reserve_self(); 652 early_init_fdt_scan_reserved_mem(); 653 654 #ifndef CONFIG_NUMA 655 memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0); 656 #endif 657 bootmem_init(); 658 659 /* 660 * Prevent memblock from allocating high memory. 661 * This cannot be done before max_low_pfn is detected, so up 662 * to this point is possible to only reserve physical memory 663 * with memblock_reserve; memblock_alloc* can be used 664 * only after this point 665 */ 666 memblock_set_current_limit(PFN_PHYS(max_low_pfn)); 667 668 mips_reserve_vmcore(); 669 670 mips_parse_crashkernel(); 671 device_tree_init(); 672 673 /* 674 * In order to reduce the possibility of kernel panic when failed to 675 * get IO TLB memory under CONFIG_SWIOTLB, it is better to allocate 676 * low memory as small as possible before plat_swiotlb_setup(), so 677 * make sparse_init() using top-down allocation. 678 */ 679 memblock_set_bottom_up(false); 680 sparse_init(); 681 memblock_set_bottom_up(true); 682 683 plat_swiotlb_setup(); 684 685 dma_contiguous_reserve(PFN_PHYS(max_low_pfn)); 686 687 /* Reserve for hibernation. */ 688 memblock_reserve(__pa_symbol(&__nosave_begin), 689 __pa_symbol(&__nosave_end) - __pa_symbol(&__nosave_begin)); 690 691 early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn)); 692 } 693 694 static void __init resource_init(void) 695 { 696 phys_addr_t start, end; 697 u64 i; 698 699 if (UNCAC_BASE != IO_BASE) 700 return; 701 702 code_resource.start = __pa_symbol(&_text); 703 code_resource.end = __pa_symbol(&_etext) - 1; 704 data_resource.start = __pa_symbol(&_etext); 705 data_resource.end = __pa_symbol(&_edata) - 1; 706 bss_resource.start = __pa_symbol(&__bss_start); 707 bss_resource.end = __pa_symbol(&__bss_stop) - 1; 708 709 for_each_mem_range(i, &start, &end) { 710 struct resource *res; 711 712 res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES); 713 if (!res) 714 panic("%s: Failed to allocate %zu bytes\n", __func__, 715 sizeof(struct resource)); 716 717 res->start = start; 718 /* 719 * In memblock, end points to the first byte after the 720 * range while in resourses, end points to the last byte in 721 * the range. 722 */ 723 res->end = end - 1; 724 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; 725 res->name = "System RAM"; 726 727 request_resource(&iomem_resource, res); 728 729 /* 730 * We don't know which RAM region contains kernel data, 731 * so we try it repeatedly and let the resource manager 732 * test it. 733 */ 734 request_resource(res, &code_resource); 735 request_resource(res, &data_resource); 736 request_resource(res, &bss_resource); 737 request_crashkernel(res); 738 } 739 } 740 741 #ifdef CONFIG_SMP 742 static void __init prefill_possible_map(void) 743 { 744 int i, possible = num_possible_cpus(); 745 746 if (possible > nr_cpu_ids) 747 possible = nr_cpu_ids; 748 749 for (i = 0; i < possible; i++) 750 set_cpu_possible(i, true); 751 for (; i < NR_CPUS; i++) 752 set_cpu_possible(i, false); 753 754 set_nr_cpu_ids(possible); 755 } 756 #else 757 static inline void prefill_possible_map(void) {} 758 #endif 759 760 static void __init setup_rng_seed(void) 761 { 762 char *rng_seed_hex = fw_getenv("rngseed"); 763 u8 rng_seed[512]; 764 size_t len; 765 766 if (!rng_seed_hex) 767 return; 768 769 len = min(sizeof(rng_seed), strlen(rng_seed_hex) / 2); 770 if (hex2bin(rng_seed, rng_seed_hex, len)) 771 return; 772 773 add_bootloader_randomness(rng_seed, len); 774 memzero_explicit(rng_seed, len); 775 memzero_explicit(rng_seed_hex, len * 2); 776 } 777 778 void __init setup_arch(char **cmdline_p) 779 { 780 cpu_probe(); 781 mips_cm_probe(); 782 prom_init(); 783 784 setup_early_fdc_console(); 785 #ifdef CONFIG_EARLY_PRINTK 786 setup_early_printk(); 787 #endif 788 cpu_report(); 789 if (IS_ENABLED(CONFIG_CPU_R4X00_BUGS64)) 790 check_bugs64_early(); 791 792 arch_mem_init(cmdline_p); 793 dmi_setup(); 794 795 resource_init(); 796 plat_smp_setup(); 797 prefill_possible_map(); 798 799 cpu_cache_init(); 800 paging_init(); 801 802 memblock_dump_all(); 803 804 setup_rng_seed(); 805 } 806 807 unsigned long kernelsp[NR_CPUS]; 808 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3; 809 810 #ifdef CONFIG_DEBUG_FS 811 struct dentry *mips_debugfs_dir; 812 static int __init debugfs_mips(void) 813 { 814 mips_debugfs_dir = debugfs_create_dir("mips", NULL); 815 return 0; 816 } 817 arch_initcall(debugfs_mips); 818 #endif 819 820 #ifdef CONFIG_DMA_NONCOHERENT 821 static int __init setcoherentio(char *str) 822 { 823 dma_default_coherent = true; 824 pr_info("Hardware DMA cache coherency (command line)\n"); 825 return 0; 826 } 827 early_param("coherentio", setcoherentio); 828 829 static int __init setnocoherentio(char *str) 830 { 831 dma_default_coherent = false; 832 pr_info("Software DMA cache coherency (command line)\n"); 833 return 0; 834 } 835 early_param("nocoherentio", setnocoherentio); 836 #endif 837 838 void __init arch_cpu_finalize_init(void) 839 { 840 unsigned int cpu = smp_processor_id(); 841 842 cpu_data[cpu].udelay_val = loops_per_jiffy; 843 check_bugs32(); 844 845 if (IS_ENABLED(CONFIG_CPU_R4X00_BUGS64)) 846 check_bugs64(); 847 } 848