1 // SPDX-License-Identifier: GPL-2.0 !! 1 /*
2 #ifdef CONFIG_MMU !! 2 * This file is subject to the terms and conditions of the GNU General Public
3 #include "setup_mm.c" !! 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/bootmem.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-contiguous.h>
>> 29 #include <linux/decompress/generic.h>
>> 30 #include <linux/of_fdt.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/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 void __init add_memory_region(phys_addr_t start, phys_addr_t size, long type)
>> 88 {
>> 89 int x = boot_mem_map.nr_map;
>> 90 int i;
>> 91
>> 92 /*
>> 93 * If the region reaches the top of the physical address space, adjust
>> 94 * the size slightly so that (start + size) doesn't overflow
>> 95 */
>> 96 if (start + size - 1 == PHYS_ADDR_MAX)
>> 97 --size;
>> 98
>> 99 /* Sanity check */
>> 100 if (start + size < start) {
>> 101 pr_warn("Trying to add an invalid memory region, skipped\n");
>> 102 return;
>> 103 }
>> 104
>> 105 /*
>> 106 * Try to merge with existing entry, if any.
>> 107 */
>> 108 for (i = 0; i < boot_mem_map.nr_map; i++) {
>> 109 struct boot_mem_map_entry *entry = boot_mem_map.map + i;
>> 110 unsigned long top;
>> 111
>> 112 if (entry->type != type)
>> 113 continue;
>> 114
>> 115 if (start + size < entry->addr)
>> 116 continue; /* no overlap */
>> 117
>> 118 if (entry->addr + entry->size < start)
>> 119 continue; /* no overlap */
>> 120
>> 121 top = max(entry->addr + entry->size, start + size);
>> 122 entry->addr = min(entry->addr, start);
>> 123 entry->size = top - entry->addr;
>> 124
>> 125 return;
>> 126 }
>> 127
>> 128 if (boot_mem_map.nr_map == BOOT_MEM_MAP_MAX) {
>> 129 pr_err("Ooops! Too many entries in the memory map!\n");
>> 130 return;
>> 131 }
>> 132
>> 133 boot_mem_map.map[x].addr = start;
>> 134 boot_mem_map.map[x].size = size;
>> 135 boot_mem_map.map[x].type = type;
>> 136 boot_mem_map.nr_map++;
>> 137 }
>> 138
>> 139 void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max)
>> 140 {
>> 141 void *dm = &detect_magic;
>> 142 phys_addr_t size;
>> 143
>> 144 for (size = sz_min; size < sz_max; size <<= 1) {
>> 145 if (!memcmp(dm, dm + size, sizeof(detect_magic)))
>> 146 break;
>> 147 }
>> 148
>> 149 pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
>> 150 ((unsigned long long) size) / SZ_1M,
>> 151 (unsigned long long) start,
>> 152 ((unsigned long long) sz_min) / SZ_1M,
>> 153 ((unsigned long long) sz_max) / SZ_1M);
>> 154
>> 155 add_memory_region(start, size, BOOT_MEM_RAM);
>> 156 }
>> 157
>> 158 static bool __init __maybe_unused memory_region_available(phys_addr_t start,
>> 159 phys_addr_t size)
>> 160 {
>> 161 int i;
>> 162 bool in_ram = false, free = true;
>> 163
>> 164 for (i = 0; i < boot_mem_map.nr_map; i++) {
>> 165 phys_addr_t start_, end_;
>> 166
>> 167 start_ = boot_mem_map.map[i].addr;
>> 168 end_ = boot_mem_map.map[i].addr + boot_mem_map.map[i].size;
>> 169
>> 170 switch (boot_mem_map.map[i].type) {
>> 171 case BOOT_MEM_RAM:
>> 172 if (start >= start_ && start + size <= end_)
>> 173 in_ram = true;
>> 174 break;
>> 175 case BOOT_MEM_RESERVED:
>> 176 if ((start >= start_ && start < end_) ||
>> 177 (start < start_ && start + size >= start_))
>> 178 free = false;
>> 179 break;
>> 180 default:
>> 181 continue;
>> 182 }
>> 183 }
>> 184
>> 185 return in_ram && free;
>> 186 }
>> 187
>> 188 static void __init print_memory_map(void)
>> 189 {
>> 190 int i;
>> 191 const int field = 2 * sizeof(unsigned long);
>> 192
>> 193 for (i = 0; i < boot_mem_map.nr_map; i++) {
>> 194 printk(KERN_INFO " memory: %0*Lx @ %0*Lx ",
>> 195 field, (unsigned long long) boot_mem_map.map[i].size,
>> 196 field, (unsigned long long) boot_mem_map.map[i].addr);
>> 197
>> 198 switch (boot_mem_map.map[i].type) {
>> 199 case BOOT_MEM_RAM:
>> 200 printk(KERN_CONT "(usable)\n");
>> 201 break;
>> 202 case BOOT_MEM_INIT_RAM:
>> 203 printk(KERN_CONT "(usable after init)\n");
>> 204 break;
>> 205 case BOOT_MEM_ROM_DATA:
>> 206 printk(KERN_CONT "(ROM data)\n");
>> 207 break;
>> 208 case BOOT_MEM_RESERVED:
>> 209 printk(KERN_CONT "(reserved)\n");
>> 210 break;
>> 211 default:
>> 212 printk(KERN_CONT "type %lu\n", boot_mem_map.map[i].type);
>> 213 break;
>> 214 }
>> 215 }
>> 216 }
>> 217
>> 218 /*
>> 219 * Manage initrd
>> 220 */
>> 221 #ifdef CONFIG_BLK_DEV_INITRD
>> 222
>> 223 static int __init rd_start_early(char *p)
>> 224 {
>> 225 unsigned long start = memparse(p, &p);
>> 226
>> 227 #ifdef CONFIG_64BIT
>> 228 /* Guess if the sign extension was forgotten by bootloader */
>> 229 if (start < XKPHYS)
>> 230 start = (int)start;
>> 231 #endif
>> 232 initrd_start = start;
>> 233 initrd_end += start;
>> 234 return 0;
>> 235 }
>> 236 early_param("rd_start", rd_start_early);
>> 237
>> 238 static int __init rd_size_early(char *p)
>> 239 {
>> 240 initrd_end += memparse(p, &p);
>> 241 return 0;
>> 242 }
>> 243 early_param("rd_size", rd_size_early);
>> 244
>> 245 /* it returns the next free pfn after initrd */
>> 246 static unsigned long __init init_initrd(void)
>> 247 {
>> 248 unsigned long end;
>> 249
>> 250 /*
>> 251 * Board specific code or command line parser should have
>> 252 * already set up initrd_start and initrd_end. In these cases
>> 253 * perfom sanity checks and use them if all looks good.
>> 254 */
>> 255 if (!initrd_start || initrd_end <= initrd_start)
>> 256 goto disable;
>> 257
>> 258 if (initrd_start & ~PAGE_MASK) {
>> 259 pr_err("initrd start must be page aligned\n");
>> 260 goto disable;
>> 261 }
>> 262 if (initrd_start < PAGE_OFFSET) {
>> 263 pr_err("initrd start < PAGE_OFFSET\n");
>> 264 goto disable;
>> 265 }
>> 266
>> 267 /*
>> 268 * Sanitize initrd addresses. For example firmware
>> 269 * can't guess if they need to pass them through
>> 270 * 64-bits values if the kernel has been built in pure
>> 271 * 32-bit. We need also to switch from KSEG0 to XKPHYS
>> 272 * addresses now, so the code can now safely use __pa().
>> 273 */
>> 274 end = __pa(initrd_end);
>> 275 initrd_end = (unsigned long)__va(end);
>> 276 initrd_start = (unsigned long)__va(__pa(initrd_start));
>> 277
>> 278 ROOT_DEV = Root_RAM0;
>> 279 return PFN_UP(end);
>> 280 disable:
>> 281 initrd_start = 0;
>> 282 initrd_end = 0;
>> 283 return 0;
>> 284 }
>> 285
>> 286 /* In some conditions (e.g. big endian bootloader with a little endian
>> 287 kernel), the initrd might appear byte swapped. Try to detect this and
>> 288 byte swap it if needed. */
>> 289 static void __init maybe_bswap_initrd(void)
>> 290 {
>> 291 #if defined(CONFIG_CPU_CAVIUM_OCTEON)
>> 292 u64 buf;
>> 293
>> 294 /* Check for CPIO signature */
>> 295 if (!memcmp((void *)initrd_start, "070701", 6))
>> 296 return;
>> 297
>> 298 /* Check for compressed initrd */
>> 299 if (decompress_method((unsigned char *)initrd_start, 8, NULL))
>> 300 return;
>> 301
>> 302 /* Try again with a byte swapped header */
>> 303 buf = swab64p((u64 *)initrd_start);
>> 304 if (!memcmp(&buf, "070701", 6) ||
>> 305 decompress_method((unsigned char *)(&buf), 8, NULL)) {
>> 306 unsigned long i;
>> 307
>> 308 pr_info("Byteswapped initrd detected\n");
>> 309 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8)
>> 310 swab64s((u64 *)i);
>> 311 }
>> 312 #endif
>> 313 }
>> 314
>> 315 static void __init finalize_initrd(void)
>> 316 {
>> 317 unsigned long size = initrd_end - initrd_start;
>> 318
>> 319 if (size == 0) {
>> 320 printk(KERN_INFO "Initrd not found or empty");
>> 321 goto disable;
>> 322 }
>> 323 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
>> 324 printk(KERN_ERR "Initrd extends beyond end of memory");
>> 325 goto disable;
>> 326 }
>> 327
>> 328 maybe_bswap_initrd();
>> 329
>> 330 reserve_bootmem(__pa(initrd_start), size, BOOTMEM_DEFAULT);
>> 331 initrd_below_start_ok = 1;
>> 332
>> 333 pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
>> 334 initrd_start, size);
>> 335 return;
>> 336 disable:
>> 337 printk(KERN_CONT " - disabling initrd\n");
>> 338 initrd_start = 0;
>> 339 initrd_end = 0;
>> 340 }
>> 341
>> 342 #else /* !CONFIG_BLK_DEV_INITRD */
>> 343
>> 344 static unsigned long __init init_initrd(void)
>> 345 {
>> 346 return 0;
>> 347 }
>> 348
>> 349 #define finalize_initrd() do {} while (0)
>> 350
>> 351 #endif
>> 352
>> 353 /*
>> 354 * Initialize the bootmem allocator. It also setup initrd related data
>> 355 * if needed.
>> 356 */
>> 357 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON3) && defined(CONFIG_NUMA))
>> 358
>> 359 static void __init bootmem_init(void)
>> 360 {
>> 361 init_initrd();
>> 362 finalize_initrd();
>> 363 }
>> 364
>> 365 #else /* !CONFIG_SGI_IP27 */
>> 366
>> 367 static unsigned long __init bootmap_bytes(unsigned long pages)
>> 368 {
>> 369 unsigned long bytes = DIV_ROUND_UP(pages, 8);
>> 370
>> 371 return ALIGN(bytes, sizeof(long));
>> 372 }
>> 373
>> 374 static void __init bootmem_init(void)
>> 375 {
>> 376 unsigned long reserved_end;
>> 377 unsigned long mapstart = ~0UL;
>> 378 unsigned long bootmap_size;
>> 379 phys_addr_t ramstart = PHYS_ADDR_MAX;
>> 380 bool bootmap_valid = false;
>> 381 int i;
>> 382
>> 383 /*
>> 384 * Sanity check any INITRD first. We don't take it into account
>> 385 * for bootmem setup initially, rely on the end-of-kernel-code
>> 386 * as our memory range starting point. Once bootmem is inited we
>> 387 * will reserve the area used for the initrd.
>> 388 */
>> 389 init_initrd();
>> 390 reserved_end = (unsigned long) PFN_UP(__pa_symbol(&_end));
>> 391
>> 392 /*
>> 393 * max_low_pfn is not a number of pages. The number of pages
>> 394 * of the system is given by 'max_low_pfn - min_low_pfn'.
>> 395 */
>> 396 min_low_pfn = ~0UL;
>> 397 max_low_pfn = 0;
>> 398
>> 399 /*
>> 400 * Find the highest page frame number we have available
>> 401 * and the lowest used RAM address
>> 402 */
>> 403 for (i = 0; i < boot_mem_map.nr_map; i++) {
>> 404 unsigned long start, end;
>> 405
>> 406 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
>> 407 continue;
>> 408
>> 409 start = PFN_UP(boot_mem_map.map[i].addr);
>> 410 end = PFN_DOWN(boot_mem_map.map[i].addr
>> 411 + boot_mem_map.map[i].size);
>> 412
>> 413 ramstart = min(ramstart, boot_mem_map.map[i].addr);
>> 414
>> 415 #ifndef CONFIG_HIGHMEM
>> 416 /*
>> 417 * Skip highmem here so we get an accurate max_low_pfn if low
>> 418 * memory stops short of high memory.
>> 419 * If the region overlaps HIGHMEM_START, end is clipped so
>> 420 * max_pfn excludes the highmem portion.
>> 421 */
>> 422 if (start >= PFN_DOWN(HIGHMEM_START))
>> 423 continue;
>> 424 if (end > PFN_DOWN(HIGHMEM_START))
>> 425 end = PFN_DOWN(HIGHMEM_START);
>> 426 #endif
>> 427
>> 428 if (end > max_low_pfn)
>> 429 max_low_pfn = end;
>> 430 if (start < min_low_pfn)
>> 431 min_low_pfn = start;
>> 432 if (end <= reserved_end)
>> 433 continue;
>> 434 #ifdef CONFIG_BLK_DEV_INITRD
>> 435 /* Skip zones before initrd and initrd itself */
>> 436 if (initrd_end && end <= (unsigned long)PFN_UP(__pa(initrd_end)))
>> 437 continue;
>> 438 #endif
>> 439 if (start >= mapstart)
>> 440 continue;
>> 441 mapstart = max(reserved_end, start);
>> 442 }
>> 443
>> 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
>> 451 if (min_low_pfn >= max_low_pfn)
>> 452 panic("Incorrect memory mapping !!!");
>> 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
>> 463 /*
>> 464 * Determine low and high memory ranges
>> 465 */
>> 466 max_pfn = max_low_pfn;
>> 467 if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) {
>> 468 #ifdef CONFIG_HIGHMEM
>> 469 highstart_pfn = PFN_DOWN(HIGHMEM_START);
>> 470 highend_pfn = max_low_pfn;
>> 471 #endif
>> 472 max_low_pfn = PFN_DOWN(HIGHMEM_START);
>> 473 }
>> 474
>> 475 #ifdef CONFIG_BLK_DEV_INITRD
>> 476 /*
>> 477 * mapstart should be after initrd_end
>> 478 */
>> 479 if (initrd_end)
>> 480 mapstart = max(mapstart, (unsigned long)PFN_UP(__pa(initrd_end)));
>> 481 #endif
>> 482
>> 483 /*
>> 484 * check that mapstart doesn't overlap with any of
>> 485 * memory regions that have been reserved through eg. DTB
>> 486 */
>> 487 bootmap_size = bootmap_bytes(max_low_pfn - min_low_pfn);
>> 488
>> 489 bootmap_valid = memory_region_available(PFN_PHYS(mapstart),
>> 490 bootmap_size);
>> 491 for (i = 0; i < boot_mem_map.nr_map && !bootmap_valid; i++) {
>> 492 unsigned long mapstart_addr;
>> 493
>> 494 switch (boot_mem_map.map[i].type) {
>> 495 case BOOT_MEM_RESERVED:
>> 496 mapstart_addr = PFN_ALIGN(boot_mem_map.map[i].addr +
>> 497 boot_mem_map.map[i].size);
>> 498 if (PHYS_PFN(mapstart_addr) < mapstart)
>> 499 break;
>> 500
>> 501 bootmap_valid = memory_region_available(mapstart_addr,
>> 502 bootmap_size);
>> 503 if (bootmap_valid)
>> 504 mapstart = PHYS_PFN(mapstart_addr);
>> 505 break;
>> 506 default:
>> 507 break;
>> 508 }
>> 509 }
>> 510
>> 511 if (!bootmap_valid)
>> 512 panic("No memory area to place a bootmap bitmap");
>> 513
>> 514 /*
>> 515 * Initialize the boot-time allocator with low memory only.
>> 516 */
>> 517 if (bootmap_size != init_bootmem_node(NODE_DATA(0), mapstart,
>> 518 min_low_pfn, max_low_pfn))
>> 519 panic("Unexpected memory size required for bootmap");
>> 520
>> 521 for (i = 0; i < boot_mem_map.nr_map; i++) {
>> 522 unsigned long start, end;
>> 523
>> 524 start = PFN_UP(boot_mem_map.map[i].addr);
>> 525 end = PFN_DOWN(boot_mem_map.map[i].addr
>> 526 + boot_mem_map.map[i].size);
>> 527
>> 528 if (start <= min_low_pfn)
>> 529 start = min_low_pfn;
>> 530 if (start >= end)
>> 531 continue;
>> 532
>> 533 #ifndef CONFIG_HIGHMEM
>> 534 if (end > max_low_pfn)
>> 535 end = max_low_pfn;
>> 536
>> 537 /*
>> 538 * ... finally, is the area going away?
>> 539 */
>> 540 if (end <= start)
>> 541 continue;
>> 542 #endif
>> 543
>> 544 memblock_add_node(PFN_PHYS(start), PFN_PHYS(end - start), 0);
>> 545 }
>> 546
>> 547 /*
>> 548 * Register fully available low RAM pages with the bootmem allocator.
>> 549 */
>> 550 for (i = 0; i < boot_mem_map.nr_map; i++) {
>> 551 unsigned long start, end, size;
>> 552
>> 553 start = PFN_UP(boot_mem_map.map[i].addr);
>> 554 end = PFN_DOWN(boot_mem_map.map[i].addr
>> 555 + boot_mem_map.map[i].size);
>> 556
>> 557 /*
>> 558 * Reserve usable memory.
>> 559 */
>> 560 switch (boot_mem_map.map[i].type) {
>> 561 case BOOT_MEM_RAM:
>> 562 break;
>> 563 case BOOT_MEM_INIT_RAM:
>> 564 memory_present(0, start, end);
>> 565 continue;
>> 566 default:
>> 567 /* Not usable memory */
>> 568 if (start > min_low_pfn && end < max_low_pfn)
>> 569 reserve_bootmem(boot_mem_map.map[i].addr,
>> 570 boot_mem_map.map[i].size,
>> 571 BOOTMEM_DEFAULT);
>> 572 continue;
>> 573 }
>> 574
>> 575 /*
>> 576 * We are rounding up the start address of usable memory
>> 577 * and at the end of the usable range downwards.
>> 578 */
>> 579 if (start >= max_low_pfn)
>> 580 continue;
>> 581 if (start < reserved_end)
>> 582 start = reserved_end;
>> 583 if (end > max_low_pfn)
>> 584 end = max_low_pfn;
>> 585
>> 586 /*
>> 587 * ... finally, is the area going away?
>> 588 */
>> 589 if (end <= start)
>> 590 continue;
>> 591 size = end - start;
>> 592
>> 593 /* Register lowmem ranges */
>> 594 free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
>> 595 memory_present(0, start, end);
>> 596 }
>> 597
>> 598 /*
>> 599 * Reserve the bootmap memory.
>> 600 */
>> 601 reserve_bootmem(PFN_PHYS(mapstart), bootmap_size, BOOTMEM_DEFAULT);
>> 602
>> 603 #ifdef CONFIG_RELOCATABLE
>> 604 /*
>> 605 * The kernel reserves all memory below its _end symbol as bootmem,
>> 606 * but the kernel may now be at a much higher address. The memory
>> 607 * between the original and new locations may be returned to the system.
>> 608 */
>> 609 if (__pa_symbol(_text) > __pa_symbol(VMLINUX_LOAD_ADDRESS)) {
>> 610 unsigned long offset;
>> 611 extern void show_kernel_relocation(const char *level);
>> 612
>> 613 offset = __pa_symbol(_text) - __pa_symbol(VMLINUX_LOAD_ADDRESS);
>> 614 free_bootmem(__pa_symbol(VMLINUX_LOAD_ADDRESS), offset);
>> 615
>> 616 #if defined(CONFIG_DEBUG_KERNEL) && defined(CONFIG_DEBUG_INFO)
>> 617 /*
>> 618 * This information is necessary when debugging the kernel
>> 619 * But is a security vulnerability otherwise!
>> 620 */
>> 621 show_kernel_relocation(KERN_INFO);
>> 622 #endif
>> 623 }
>> 624 #endif
>> 625
>> 626 /*
>> 627 * Reserve initrd memory if needed.
>> 628 */
>> 629 finalize_initrd();
>> 630 }
>> 631
>> 632 #endif /* CONFIG_SGI_IP27 */
>> 633
>> 634 /*
>> 635 * arch_mem_init - initialize memory management subsystem
>> 636 *
>> 637 * o plat_mem_setup() detects the memory configuration and will record detected
>> 638 * memory areas using add_memory_region.
>> 639 *
>> 640 * At this stage the memory configuration of the system is known to the
>> 641 * kernel but generic memory management system is still entirely uninitialized.
>> 642 *
>> 643 * o bootmem_init()
>> 644 * o sparse_init()
>> 645 * o paging_init()
>> 646 * o dma_contiguous_reserve()
>> 647 *
>> 648 * At this stage the bootmem allocator is ready to use.
>> 649 *
>> 650 * NOTE: historically plat_mem_setup did the entire platform initialization.
>> 651 * This was rather impractical because it meant plat_mem_setup had to
>> 652 * get away without any kind of memory allocator. To keep old code from
>> 653 * breaking plat_setup was just renamed to plat_mem_setup and a second platform
>> 654 * initialization hook for anything else was introduced.
>> 655 */
>> 656
>> 657 static int usermem __initdata;
>> 658
>> 659 static int __init early_parse_mem(char *p)
>> 660 {
>> 661 phys_addr_t start, size;
>> 662
>> 663 /*
>> 664 * If a user specifies memory size, we
>> 665 * blow away any automatically generated
>> 666 * size.
>> 667 */
>> 668 if (usermem == 0) {
>> 669 boot_mem_map.nr_map = 0;
>> 670 usermem = 1;
>> 671 }
>> 672 start = 0;
>> 673 size = memparse(p, &p);
>> 674 if (*p == '@')
>> 675 start = memparse(p + 1, &p);
>> 676
>> 677 add_memory_region(start, size, BOOT_MEM_RAM);
>> 678
>> 679 return 0;
>> 680 }
>> 681 early_param("mem", early_parse_mem);
>> 682
>> 683 static int __init early_parse_memmap(char *p)
>> 684 {
>> 685 char *oldp;
>> 686 u64 start_at, mem_size;
>> 687
>> 688 if (!p)
>> 689 return -EINVAL;
>> 690
>> 691 if (!strncmp(p, "exactmap", 8)) {
>> 692 pr_err("\"memmap=exactmap\" invalid on MIPS\n");
>> 693 return 0;
>> 694 }
>> 695
>> 696 oldp = p;
>> 697 mem_size = memparse(p, &p);
>> 698 if (p == oldp)
>> 699 return -EINVAL;
>> 700
>> 701 if (*p == '@') {
>> 702 start_at = memparse(p+1, &p);
>> 703 add_memory_region(start_at, mem_size, BOOT_MEM_RAM);
>> 704 } else if (*p == '#') {
>> 705 pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n");
>> 706 return -EINVAL;
>> 707 } else if (*p == '$') {
>> 708 start_at = memparse(p+1, &p);
>> 709 add_memory_region(start_at, mem_size, BOOT_MEM_RESERVED);
>> 710 } else {
>> 711 pr_err("\"memmap\" invalid format!\n");
>> 712 return -EINVAL;
>> 713 }
>> 714
>> 715 if (*p == '\0') {
>> 716 usermem = 1;
>> 717 return 0;
>> 718 } else
>> 719 return -EINVAL;
>> 720 }
>> 721 early_param("memmap", early_parse_memmap);
>> 722
>> 723 #ifdef CONFIG_PROC_VMCORE
>> 724 unsigned long setup_elfcorehdr, setup_elfcorehdr_size;
>> 725 static int __init early_parse_elfcorehdr(char *p)
>> 726 {
>> 727 int i;
>> 728
>> 729 setup_elfcorehdr = memparse(p, &p);
>> 730
>> 731 for (i = 0; i < boot_mem_map.nr_map; i++) {
>> 732 unsigned long start = boot_mem_map.map[i].addr;
>> 733 unsigned long end = (boot_mem_map.map[i].addr +
>> 734 boot_mem_map.map[i].size);
>> 735 if (setup_elfcorehdr >= start && setup_elfcorehdr < end) {
>> 736 /*
>> 737 * Reserve from the elf core header to the end of
>> 738 * the memory segment, that should all be kdump
>> 739 * reserved memory.
>> 740 */
>> 741 setup_elfcorehdr_size = end - setup_elfcorehdr;
>> 742 break;
>> 743 }
>> 744 }
>> 745 /*
>> 746 * If we don't find it in the memory map, then we shouldn't
>> 747 * have to worry about it, as the new kernel won't use it.
>> 748 */
>> 749 return 0;
>> 750 }
>> 751 early_param("elfcorehdr", early_parse_elfcorehdr);
>> 752 #endif
>> 753
>> 754 static void __init arch_mem_addpart(phys_addr_t mem, phys_addr_t end, int type)
>> 755 {
>> 756 phys_addr_t size;
>> 757 int i;
>> 758
>> 759 size = end - mem;
>> 760 if (!size)
>> 761 return;
>> 762
>> 763 /* Make sure it is in the boot_mem_map */
>> 764 for (i = 0; i < boot_mem_map.nr_map; i++) {
>> 765 if (mem >= boot_mem_map.map[i].addr &&
>> 766 mem < (boot_mem_map.map[i].addr +
>> 767 boot_mem_map.map[i].size))
>> 768 return;
>> 769 }
>> 770 add_memory_region(mem, size, type);
>> 771 }
>> 772
>> 773 #ifdef CONFIG_KEXEC
>> 774 static inline unsigned long long get_total_mem(void)
>> 775 {
>> 776 unsigned long long total;
>> 777
>> 778 total = max_pfn - min_low_pfn;
>> 779 return total << PAGE_SHIFT;
>> 780 }
>> 781
>> 782 static void __init mips_parse_crashkernel(void)
>> 783 {
>> 784 unsigned long long total_mem;
>> 785 unsigned long long crash_size, crash_base;
>> 786 int ret;
>> 787
>> 788 total_mem = get_total_mem();
>> 789 ret = parse_crashkernel(boot_command_line, total_mem,
>> 790 &crash_size, &crash_base);
>> 791 if (ret != 0 || crash_size <= 0)
>> 792 return;
>> 793
>> 794 if (!memory_region_available(crash_base, crash_size)) {
>> 795 pr_warn("Invalid memory region reserved for crash kernel\n");
>> 796 return;
>> 797 }
>> 798
>> 799 crashk_res.start = crash_base;
>> 800 crashk_res.end = crash_base + crash_size - 1;
>> 801 }
>> 802
>> 803 static void __init request_crashkernel(struct resource *res)
>> 804 {
>> 805 int ret;
>> 806
>> 807 if (crashk_res.start == crashk_res.end)
>> 808 return;
>> 809
>> 810 ret = request_resource(res, &crashk_res);
>> 811 if (!ret)
>> 812 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
>> 813 (unsigned long)((crashk_res.end -
>> 814 crashk_res.start + 1) >> 20),
>> 815 (unsigned long)(crashk_res.start >> 20));
>> 816 }
>> 817 #else /* !defined(CONFIG_KEXEC) */
>> 818 static void __init mips_parse_crashkernel(void)
>> 819 {
>> 820 }
>> 821
>> 822 static void __init request_crashkernel(struct resource *res)
>> 823 {
>> 824 }
>> 825 #endif /* !defined(CONFIG_KEXEC) */
>> 826
>> 827 #define USE_PROM_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_BOOTLOADER)
>> 828 #define USE_DTB_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB)
>> 829 #define EXTEND_WITH_PROM IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND)
>> 830 #define BUILTIN_EXTEND_WITH_PROM \
>> 831 IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND)
>> 832
>> 833 static void __init arch_mem_init(char **cmdline_p)
>> 834 {
>> 835 struct memblock_region *reg;
>> 836 extern void plat_mem_setup(void);
>> 837
>> 838 /*
>> 839 * Initialize boot_command_line to an innocuous but non-empty string in
>> 840 * order to prevent early_init_dt_scan_chosen() from copying
>> 841 * CONFIG_CMDLINE into it without our knowledge. We handle
>> 842 * CONFIG_CMDLINE ourselves below & don't want to duplicate its
>> 843 * content because repeating arguments can be problematic.
>> 844 */
>> 845 strlcpy(boot_command_line, " ", COMMAND_LINE_SIZE);
>> 846
>> 847 /* call board setup routine */
>> 848 plat_mem_setup();
>> 849
>> 850 /*
>> 851 * Make sure all kernel memory is in the maps. The "UP" and
>> 852 * "DOWN" are opposite for initdata since if it crosses over
>> 853 * into another memory section you don't want that to be
>> 854 * freed when the initdata is freed.
>> 855 */
>> 856 arch_mem_addpart(PFN_DOWN(__pa_symbol(&_text)) << PAGE_SHIFT,
>> 857 PFN_UP(__pa_symbol(&_edata)) << PAGE_SHIFT,
>> 858 BOOT_MEM_RAM);
>> 859 arch_mem_addpart(PFN_UP(__pa_symbol(&__init_begin)) << PAGE_SHIFT,
>> 860 PFN_DOWN(__pa_symbol(&__init_end)) << PAGE_SHIFT,
>> 861 BOOT_MEM_INIT_RAM);
>> 862
>> 863 pr_info("Determined physical RAM map:\n");
>> 864 print_memory_map();
>> 865
>> 866 #if defined(CONFIG_CMDLINE_BOOL) && defined(CONFIG_CMDLINE_OVERRIDE)
>> 867 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
>> 868 #else
>> 869 if ((USE_PROM_CMDLINE && arcs_cmdline[0]) ||
>> 870 (USE_DTB_CMDLINE && !boot_command_line[0]))
>> 871 strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
>> 872
>> 873 if (EXTEND_WITH_PROM && arcs_cmdline[0]) {
>> 874 if (boot_command_line[0])
>> 875 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
>> 876 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
>> 877 }
>> 878
>> 879 #if defined(CONFIG_CMDLINE_BOOL)
>> 880 if (builtin_cmdline[0]) {
>> 881 if (boot_command_line[0])
>> 882 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
>> 883 strlcat(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
>> 884 }
>> 885
>> 886 if (BUILTIN_EXTEND_WITH_PROM && arcs_cmdline[0]) {
>> 887 if (boot_command_line[0])
>> 888 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
>> 889 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
>> 890 }
>> 891 #endif
>> 892 #endif
>> 893 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
>> 894
>> 895 *cmdline_p = command_line;
>> 896
>> 897 parse_early_param();
>> 898
>> 899 if (usermem) {
>> 900 pr_info("User-defined physical RAM map:\n");
>> 901 print_memory_map();
>> 902 }
>> 903
>> 904 early_init_fdt_reserve_self();
>> 905 early_init_fdt_scan_reserved_mem();
>> 906
>> 907 bootmem_init();
>> 908 #ifdef CONFIG_PROC_VMCORE
>> 909 if (setup_elfcorehdr && setup_elfcorehdr_size) {
>> 910 printk(KERN_INFO "kdump reserved memory at %lx-%lx\n",
>> 911 setup_elfcorehdr, setup_elfcorehdr_size);
>> 912 reserve_bootmem(setup_elfcorehdr, setup_elfcorehdr_size,
>> 913 BOOTMEM_DEFAULT);
>> 914 }
>> 915 #endif
>> 916
>> 917 mips_parse_crashkernel();
>> 918 #ifdef CONFIG_KEXEC
>> 919 if (crashk_res.start != crashk_res.end)
>> 920 reserve_bootmem(crashk_res.start,
>> 921 crashk_res.end - crashk_res.start + 1,
>> 922 BOOTMEM_DEFAULT);
>> 923 #endif
>> 924 device_tree_init();
>> 925 sparse_init();
>> 926 plat_swiotlb_setup();
>> 927
>> 928 dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
>> 929 /* Tell bootmem about cma reserved memblock section */
>> 930 for_each_memblock(reserved, reg)
>> 931 if (reg->size != 0)
>> 932 reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
>> 933
>> 934 reserve_bootmem_region(__pa_symbol(&__nosave_begin),
>> 935 __pa_symbol(&__nosave_end)); /* Reserve for hibernation */
>> 936 }
>> 937
>> 938 static void __init resource_init(void)
>> 939 {
>> 940 int i;
>> 941
>> 942 if (UNCAC_BASE != IO_BASE)
>> 943 return;
>> 944
>> 945 code_resource.start = __pa_symbol(&_text);
>> 946 code_resource.end = __pa_symbol(&_etext) - 1;
>> 947 data_resource.start = __pa_symbol(&_etext);
>> 948 data_resource.end = __pa_symbol(&_edata) - 1;
>> 949 bss_resource.start = __pa_symbol(&__bss_start);
>> 950 bss_resource.end = __pa_symbol(&__bss_stop) - 1;
>> 951
>> 952 for (i = 0; i < boot_mem_map.nr_map; i++) {
>> 953 struct resource *res;
>> 954 unsigned long start, end;
>> 955
>> 956 start = boot_mem_map.map[i].addr;
>> 957 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
>> 958 if (start >= HIGHMEM_START)
>> 959 continue;
>> 960 if (end >= HIGHMEM_START)
>> 961 end = HIGHMEM_START - 1;
>> 962
>> 963 res = alloc_bootmem(sizeof(struct resource));
>> 964
>> 965 res->start = start;
>> 966 res->end = end;
>> 967 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
>> 968
>> 969 switch (boot_mem_map.map[i].type) {
>> 970 case BOOT_MEM_RAM:
>> 971 case BOOT_MEM_INIT_RAM:
>> 972 case BOOT_MEM_ROM_DATA:
>> 973 res->name = "System RAM";
>> 974 res->flags |= IORESOURCE_SYSRAM;
>> 975 break;
>> 976 case BOOT_MEM_RESERVED:
>> 977 default:
>> 978 res->name = "reserved";
>> 979 }
>> 980
>> 981 request_resource(&iomem_resource, res);
>> 982
>> 983 /*
>> 984 * We don't know which RAM region contains kernel data,
>> 985 * so we try it repeatedly and let the resource manager
>> 986 * test it.
>> 987 */
>> 988 request_resource(res, &code_resource);
>> 989 request_resource(res, &data_resource);
>> 990 request_resource(res, &bss_resource);
>> 991 request_crashkernel(res);
>> 992 }
>> 993 }
>> 994
>> 995 #ifdef CONFIG_SMP
>> 996 static void __init prefill_possible_map(void)
>> 997 {
>> 998 int i, possible = num_possible_cpus();
>> 999
>> 1000 if (possible > nr_cpu_ids)
>> 1001 possible = nr_cpu_ids;
>> 1002
>> 1003 for (i = 0; i < possible; i++)
>> 1004 set_cpu_possible(i, true);
>> 1005 for (; i < NR_CPUS; i++)
>> 1006 set_cpu_possible(i, false);
>> 1007
>> 1008 nr_cpu_ids = possible;
>> 1009 }
4 #else 1010 #else
5 #include "setup_no.c" !! 1011 static inline void prefill_possible_map(void) {}
>> 1012 #endif
>> 1013
>> 1014 void __init setup_arch(char **cmdline_p)
>> 1015 {
>> 1016 cpu_probe();
>> 1017 mips_cm_probe();
>> 1018 prom_init();
>> 1019
>> 1020 setup_early_fdc_console();
>> 1021 #ifdef CONFIG_EARLY_PRINTK
>> 1022 setup_early_printk();
>> 1023 #endif
>> 1024 cpu_report();
>> 1025 check_bugs_early();
>> 1026
>> 1027 #if defined(CONFIG_VT)
>> 1028 #if defined(CONFIG_VGA_CONSOLE)
>> 1029 conswitchp = &vga_con;
>> 1030 #elif defined(CONFIG_DUMMY_CONSOLE)
>> 1031 conswitchp = &dummy_con;
>> 1032 #endif
>> 1033 #endif
>> 1034
>> 1035 arch_mem_init(cmdline_p);
>> 1036
>> 1037 resource_init();
>> 1038 plat_smp_setup();
>> 1039 prefill_possible_map();
>> 1040
>> 1041 cpu_cache_init();
>> 1042 paging_init();
>> 1043 }
>> 1044
>> 1045 unsigned long kernelsp[NR_CPUS];
>> 1046 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
>> 1047
>> 1048 #ifdef CONFIG_USE_OF
>> 1049 unsigned long fw_passed_dtb;
6 #endif 1050 #endif
7 1051
8 #if IS_ENABLED(CONFIG_INPUT_M68K_BEEP) !! 1052 #ifdef CONFIG_DEBUG_FS
9 void (*mach_beep)(unsigned int, unsigned int); !! 1053 struct dentry *mips_debugfs_dir;
10 EXPORT_SYMBOL(mach_beep); !! 1054 static int __init debugfs_mips(void)
>> 1055 {
>> 1056 struct dentry *d;
>> 1057
>> 1058 d = debugfs_create_dir("mips", NULL);
>> 1059 if (!d)
>> 1060 return -ENOMEM;
>> 1061 mips_debugfs_dir = d;
>> 1062 return 0;
>> 1063 }
>> 1064 arch_initcall(debugfs_mips);
11 #endif 1065 #endif
12 1066
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