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/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-map-ops.h>
>> 28 #include <linux/decompress/generic.h>
>> 29 #include <linux/of_fdt.h>
>> 30 #include <linux/of_reserved_mem.h>
>> 31 #include <linux/dmi.h>
>> 32
>> 33 #include <asm/addrspace.h>
>> 34 #include <asm/bootinfo.h>
>> 35 #include <asm/bugs.h>
>> 36 #include <asm/cache.h>
>> 37 #include <asm/cdmm.h>
>> 38 #include <asm/cpu.h>
>> 39 #include <asm/debug.h>
>> 40 #include <asm/dma-coherence.h>
>> 41 #include <asm/sections.h>
>> 42 #include <asm/setup.h>
>> 43 #include <asm/smp-ops.h>
>> 44 #include <asm/prom.h>
>> 45
>> 46 #ifdef CONFIG_MIPS_ELF_APPENDED_DTB
>> 47 const char __section(".appended_dtb") __appended_dtb[0x100000];
>> 48 #endif /* CONFIG_MIPS_ELF_APPENDED_DTB */
>> 49
>> 50 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
>> 51
>> 52 EXPORT_SYMBOL(cpu_data);
>> 53
>> 54 #ifdef CONFIG_VT
>> 55 struct screen_info screen_info;
>> 56 #endif
>> 57
>> 58 /*
>> 59 * Setup information
>> 60 *
>> 61 * These are initialized so they are in the .data section
>> 62 */
>> 63 unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
>> 64
>> 65 EXPORT_SYMBOL(mips_machtype);
>> 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 const char builtin_cmdline[] __initconst = CONFIG_CMDLINE;
>> 72 #else
>> 73 static const char builtin_cmdline[] __initconst = "";
>> 74 #endif
>> 75
>> 76 /*
>> 77 * mips_io_port_base is the begin of the address space to which x86 style
>> 78 * I/O ports are mapped.
>> 79 */
>> 80 unsigned long mips_io_port_base = -1;
>> 81 EXPORT_SYMBOL(mips_io_port_base);
>> 82
>> 83 static struct resource code_resource = { .name = "Kernel code", };
>> 84 static struct resource data_resource = { .name = "Kernel data", };
>> 85 static struct resource bss_resource = { .name = "Kernel bss", };
>> 86
>> 87 unsigned long __kaslr_offset __ro_after_init;
>> 88 EXPORT_SYMBOL(__kaslr_offset);
>> 89
>> 90 static void *detect_magic __initdata = detect_memory_region;
>> 91
>> 92 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
>> 93 unsigned long ARCH_PFN_OFFSET;
>> 94 EXPORT_SYMBOL(ARCH_PFN_OFFSET);
>> 95 #endif
>> 96
>> 97 void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max)
>> 98 {
>> 99 void *dm = &detect_magic;
>> 100 phys_addr_t size;
>> 101
>> 102 for (size = sz_min; size < sz_max; size <<= 1) {
>> 103 if (!memcmp(dm, dm + size, sizeof(detect_magic)))
>> 104 break;
>> 105 }
>> 106
>> 107 pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
>> 108 ((unsigned long long) size) / SZ_1M,
>> 109 (unsigned long long) start,
>> 110 ((unsigned long long) sz_min) / SZ_1M,
>> 111 ((unsigned long long) sz_max) / SZ_1M);
>> 112
>> 113 memblock_add(start, size);
>> 114 }
>> 115
>> 116 /*
>> 117 * Manage initrd
>> 118 */
>> 119 #ifdef CONFIG_BLK_DEV_INITRD
>> 120
>> 121 static int __init rd_start_early(char *p)
>> 122 {
>> 123 unsigned long start = memparse(p, &p);
>> 124
>> 125 #ifdef CONFIG_64BIT
>> 126 /* Guess if the sign extension was forgotten by bootloader */
>> 127 if (start < XKPHYS)
>> 128 start = (int)start;
>> 129 #endif
>> 130 initrd_start = start;
>> 131 initrd_end += start;
>> 132 return 0;
>> 133 }
>> 134 early_param("rd_start", rd_start_early);
>> 135
>> 136 static int __init rd_size_early(char *p)
>> 137 {
>> 138 initrd_end += memparse(p, &p);
>> 139 return 0;
>> 140 }
>> 141 early_param("rd_size", rd_size_early);
>> 142
>> 143 /* it returns the next free pfn after initrd */
>> 144 static unsigned long __init init_initrd(void)
>> 145 {
>> 146 unsigned long end;
>> 147
>> 148 /*
>> 149 * Board specific code or command line parser should have
>> 150 * already set up initrd_start and initrd_end. In these cases
>> 151 * perfom sanity checks and use them if all looks good.
>> 152 */
>> 153 if (!initrd_start || initrd_end <= initrd_start)
>> 154 goto disable;
>> 155
>> 156 if (initrd_start & ~PAGE_MASK) {
>> 157 pr_err("initrd start must be page aligned\n");
>> 158 goto disable;
>> 159 }
>> 160 if (initrd_start < PAGE_OFFSET) {
>> 161 pr_err("initrd start < PAGE_OFFSET\n");
>> 162 goto disable;
>> 163 }
>> 164
>> 165 /*
>> 166 * Sanitize initrd addresses. For example firmware
>> 167 * can't guess if they need to pass them through
>> 168 * 64-bits values if the kernel has been built in pure
>> 169 * 32-bit. We need also to switch from KSEG0 to XKPHYS
>> 170 * addresses now, so the code can now safely use __pa().
>> 171 */
>> 172 end = __pa(initrd_end);
>> 173 initrd_end = (unsigned long)__va(end);
>> 174 initrd_start = (unsigned long)__va(__pa(initrd_start));
>> 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 #ifdef CONFIG_HIGHMEM
>> 326 highstart_pfn = PFN_DOWN(HIGHMEM_START);
>> 327 highend_pfn = max_pfn;
4 #else 328 #else
5 #include "setup_no.c" !! 329 max_low_pfn = PFN_DOWN(HIGHMEM_START);
>> 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 /*
>> 349 * If a user specifies memory size, we
>> 350 * blow away any automatically generated
>> 351 * size.
>> 352 */
>> 353 if (usermem == 0) {
>> 354 usermem = 1;
>> 355 memblock_remove(memblock_start_of_DRAM(),
>> 356 memblock_end_of_DRAM() - memblock_start_of_DRAM());
>> 357 }
>> 358 start = 0;
>> 359 size = memparse(p, &p);
>> 360 if (*p == '@')
>> 361 start = memparse(p + 1, &p);
>> 362
>> 363 memblock_add(start, size);
>> 364
>> 365 return 0;
>> 366 }
>> 367 early_param("mem", early_parse_mem);
>> 368
>> 369 static int __init early_parse_memmap(char *p)
>> 370 {
>> 371 char *oldp;
>> 372 u64 start_at, mem_size;
>> 373
>> 374 if (!p)
>> 375 return -EINVAL;
>> 376
>> 377 if (!strncmp(p, "exactmap", 8)) {
>> 378 pr_err("\"memmap=exactmap\" invalid on MIPS\n");
>> 379 return 0;
>> 380 }
>> 381
>> 382 oldp = p;
>> 383 mem_size = memparse(p, &p);
>> 384 if (p == oldp)
>> 385 return -EINVAL;
>> 386
>> 387 if (*p == '@') {
>> 388 start_at = memparse(p+1, &p);
>> 389 memblock_add(start_at, mem_size);
>> 390 } else if (*p == '#') {
>> 391 pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n");
>> 392 return -EINVAL;
>> 393 } else if (*p == '$') {
>> 394 start_at = memparse(p+1, &p);
>> 395 memblock_add(start_at, mem_size);
>> 396 memblock_reserve(start_at, mem_size);
>> 397 } else {
>> 398 pr_err("\"memmap\" invalid format!\n");
>> 399 return -EINVAL;
>> 400 }
>> 401
>> 402 if (*p == '\0') {
>> 403 usermem = 1;
>> 404 return 0;
>> 405 } else
>> 406 return -EINVAL;
>> 407 }
>> 408 early_param("memmap", early_parse_memmap);
>> 409
>> 410 #ifdef CONFIG_PROC_VMCORE
>> 411 static unsigned long setup_elfcorehdr, setup_elfcorehdr_size;
>> 412 static int __init early_parse_elfcorehdr(char *p)
>> 413 {
>> 414 phys_addr_t start, end;
>> 415 u64 i;
>> 416
>> 417 setup_elfcorehdr = memparse(p, &p);
>> 418
>> 419 for_each_mem_range(i, &start, &end) {
>> 420 if (setup_elfcorehdr >= start && setup_elfcorehdr < end) {
>> 421 /*
>> 422 * Reserve from the elf core header to the end of
>> 423 * the memory segment, that should all be kdump
>> 424 * reserved memory.
>> 425 */
>> 426 setup_elfcorehdr_size = end - setup_elfcorehdr;
>> 427 break;
>> 428 }
>> 429 }
>> 430 /*
>> 431 * If we don't find it in the memory map, then we shouldn't
>> 432 * have to worry about it, as the new kernel won't use it.
>> 433 */
>> 434 return 0;
>> 435 }
>> 436 early_param("elfcorehdr", early_parse_elfcorehdr);
6 #endif 437 #endif
7 438
8 #if IS_ENABLED(CONFIG_INPUT_M68K_BEEP) !! 439 #ifdef CONFIG_KEXEC
9 void (*mach_beep)(unsigned int, unsigned int); !! 440
10 EXPORT_SYMBOL(mach_beep); !! 441 /* 64M alignment for crash kernel regions */
>> 442 #define CRASH_ALIGN SZ_64M
>> 443 #define CRASH_ADDR_MAX SZ_512M
>> 444
>> 445 static void __init mips_parse_crashkernel(void)
>> 446 {
>> 447 unsigned long long total_mem;
>> 448 unsigned long long crash_size, crash_base;
>> 449 int ret;
>> 450
>> 451 total_mem = memblock_phys_mem_size();
>> 452 ret = parse_crashkernel(boot_command_line, total_mem,
>> 453 &crash_size, &crash_base);
>> 454 if (ret != 0 || crash_size <= 0)
>> 455 return;
>> 456
>> 457 if (crash_base <= 0) {
>> 458 crash_base = memblock_find_in_range(CRASH_ALIGN, CRASH_ADDR_MAX,
>> 459 crash_size, CRASH_ALIGN);
>> 460 if (!crash_base) {
>> 461 pr_warn("crashkernel reservation failed - No suitable area found.\n");
>> 462 return;
>> 463 }
>> 464 } else {
>> 465 unsigned long long start;
>> 466
>> 467 start = memblock_find_in_range(crash_base, crash_base + crash_size,
>> 468 crash_size, 1);
>> 469 if (start != crash_base) {
>> 470 pr_warn("Invalid memory region reserved for crash kernel\n");
>> 471 return;
>> 472 }
>> 473 }
>> 474
>> 475 crashk_res.start = crash_base;
>> 476 crashk_res.end = crash_base + crash_size - 1;
>> 477 }
>> 478
>> 479 static void __init request_crashkernel(struct resource *res)
>> 480 {
>> 481 int ret;
>> 482
>> 483 if (crashk_res.start == crashk_res.end)
>> 484 return;
>> 485
>> 486 ret = request_resource(res, &crashk_res);
>> 487 if (!ret)
>> 488 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
>> 489 (unsigned long)(resource_size(&crashk_res) >> 20),
>> 490 (unsigned long)(crashk_res.start >> 20));
>> 491 }
>> 492 #else /* !defined(CONFIG_KEXEC) */
>> 493 static void __init mips_parse_crashkernel(void)
>> 494 {
>> 495 }
>> 496
>> 497 static void __init request_crashkernel(struct resource *res)
>> 498 {
>> 499 }
>> 500 #endif /* !defined(CONFIG_KEXEC) */
>> 501
>> 502 static void __init check_kernel_sections_mem(void)
>> 503 {
>> 504 phys_addr_t start = __pa_symbol(&_text);
>> 505 phys_addr_t size = __pa_symbol(&_end) - start;
>> 506
>> 507 if (!memblock_is_region_memory(start, size)) {
>> 508 pr_info("Kernel sections are not in the memory maps\n");
>> 509 memblock_add(start, size);
>> 510 }
>> 511 }
>> 512
>> 513 static void __init bootcmdline_append(const char *s, size_t max)
>> 514 {
>> 515 if (!s[0] || !max)
>> 516 return;
>> 517
>> 518 if (boot_command_line[0])
>> 519 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
>> 520
>> 521 strlcat(boot_command_line, s, max);
>> 522 }
>> 523
>> 524 #ifdef CONFIG_OF_EARLY_FLATTREE
>> 525
>> 526 static int __init bootcmdline_scan_chosen(unsigned long node, const char *uname,
>> 527 int depth, void *data)
>> 528 {
>> 529 bool *dt_bootargs = data;
>> 530 const char *p;
>> 531 int l;
>> 532
>> 533 if (depth != 1 || !data ||
>> 534 (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
>> 535 return 0;
>> 536
>> 537 p = of_get_flat_dt_prop(node, "bootargs", &l);
>> 538 if (p != NULL && l > 0) {
>> 539 bootcmdline_append(p, min(l, COMMAND_LINE_SIZE));
>> 540 *dt_bootargs = true;
>> 541 }
>> 542
>> 543 return 1;
>> 544 }
>> 545
>> 546 #endif /* CONFIG_OF_EARLY_FLATTREE */
>> 547
>> 548 static void __init bootcmdline_init(void)
>> 549 {
>> 550 bool dt_bootargs = false;
>> 551
>> 552 /*
>> 553 * If CMDLINE_OVERRIDE is enabled then initializing the command line is
>> 554 * trivial - we simply use the built-in command line unconditionally &
>> 555 * unmodified.
>> 556 */
>> 557 if (IS_ENABLED(CONFIG_CMDLINE_OVERRIDE)) {
>> 558 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
>> 559 return;
>> 560 }
>> 561
>> 562 /*
>> 563 * If the user specified a built-in command line &
>> 564 * MIPS_CMDLINE_BUILTIN_EXTEND, then the built-in command line is
>> 565 * prepended to arguments from the bootloader or DT so we'll copy them
>> 566 * to the start of boot_command_line here. Otherwise, empty
>> 567 * boot_command_line to undo anything early_init_dt_scan_chosen() did.
>> 568 */
>> 569 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND))
>> 570 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
>> 571 else
>> 572 boot_command_line[0] = 0;
>> 573
>> 574 #ifdef CONFIG_OF_EARLY_FLATTREE
>> 575 /*
>> 576 * If we're configured to take boot arguments from DT, look for those
>> 577 * now.
>> 578 */
>> 579 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB) ||
>> 580 IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND))
>> 581 of_scan_flat_dt(bootcmdline_scan_chosen, &dt_bootargs);
>> 582 #endif
>> 583
>> 584 /*
>> 585 * If we didn't get any arguments from DT (regardless of whether that's
>> 586 * because we weren't configured to look for them, or because we looked
>> 587 * & found none) then we'll take arguments from the bootloader.
>> 588 * plat_mem_setup() should have filled arcs_cmdline with arguments from
>> 589 * the bootloader.
>> 590 */
>> 591 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND) || !dt_bootargs)
>> 592 bootcmdline_append(arcs_cmdline, COMMAND_LINE_SIZE);
>> 593
>> 594 /*
>> 595 * If the user specified a built-in command line & we didn't already
>> 596 * prepend it, we append it to boot_command_line here.
>> 597 */
>> 598 if (IS_ENABLED(CONFIG_CMDLINE_BOOL) &&
>> 599 !IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND))
>> 600 bootcmdline_append(builtin_cmdline, COMMAND_LINE_SIZE);
>> 601 }
>> 602
>> 603 /*
>> 604 * arch_mem_init - initialize memory management subsystem
>> 605 *
>> 606 * o plat_mem_setup() detects the memory configuration and will record detected
>> 607 * memory areas using memblock_add.
>> 608 *
>> 609 * At this stage the memory configuration of the system is known to the
>> 610 * kernel but generic memory management system is still entirely uninitialized.
>> 611 *
>> 612 * o bootmem_init()
>> 613 * o sparse_init()
>> 614 * o paging_init()
>> 615 * o dma_contiguous_reserve()
>> 616 *
>> 617 * At this stage the bootmem allocator is ready to use.
>> 618 *
>> 619 * NOTE: historically plat_mem_setup did the entire platform initialization.
>> 620 * This was rather impractical because it meant plat_mem_setup had to
>> 621 * get away without any kind of memory allocator. To keep old code from
>> 622 * breaking plat_setup was just renamed to plat_mem_setup and a second platform
>> 623 * initialization hook for anything else was introduced.
>> 624 */
>> 625 static void __init arch_mem_init(char **cmdline_p)
>> 626 {
>> 627 /* call board setup routine */
>> 628 plat_mem_setup();
>> 629 memblock_set_bottom_up(true);
>> 630
>> 631 bootcmdline_init();
>> 632 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
>> 633 *cmdline_p = command_line;
>> 634
>> 635 parse_early_param();
>> 636
>> 637 if (usermem)
>> 638 pr_info("User-defined physical RAM map overwrite\n");
>> 639
>> 640 check_kernel_sections_mem();
>> 641
>> 642 early_init_fdt_reserve_self();
>> 643 early_init_fdt_scan_reserved_mem();
>> 644
>> 645 #ifndef CONFIG_NUMA
>> 646 memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0);
>> 647 #endif
>> 648 bootmem_init();
>> 649
>> 650 /*
>> 651 * Prevent memblock from allocating high memory.
>> 652 * This cannot be done before max_low_pfn is detected, so up
>> 653 * to this point is possible to only reserve physical memory
>> 654 * with memblock_reserve; memblock_alloc* can be used
>> 655 * only after this point
>> 656 */
>> 657 memblock_set_current_limit(PFN_PHYS(max_low_pfn));
>> 658
>> 659 #ifdef CONFIG_PROC_VMCORE
>> 660 if (setup_elfcorehdr && setup_elfcorehdr_size) {
>> 661 printk(KERN_INFO "kdump reserved memory at %lx-%lx\n",
>> 662 setup_elfcorehdr, setup_elfcorehdr_size);
>> 663 memblock_reserve(setup_elfcorehdr, setup_elfcorehdr_size);
>> 664 }
>> 665 #endif
>> 666
>> 667 mips_parse_crashkernel();
>> 668 #ifdef CONFIG_KEXEC
>> 669 if (crashk_res.start != crashk_res.end)
>> 670 memblock_reserve(crashk_res.start, resource_size(&crashk_res));
>> 671 #endif
>> 672 device_tree_init();
>> 673
>> 674 /*
>> 675 * In order to reduce the possibility of kernel panic when failed to
>> 676 * get IO TLB memory under CONFIG_SWIOTLB, it is better to allocate
>> 677 * low memory as small as possible before plat_swiotlb_setup(), so
>> 678 * make sparse_init() using top-down allocation.
>> 679 */
>> 680 memblock_set_bottom_up(false);
>> 681 sparse_init();
>> 682 memblock_set_bottom_up(true);
>> 683
>> 684 plat_swiotlb_setup();
>> 685
>> 686 dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
>> 687
>> 688 /* Reserve for hibernation. */
>> 689 memblock_reserve(__pa_symbol(&__nosave_begin),
>> 690 __pa_symbol(&__nosave_end) - __pa_symbol(&__nosave_begin));
>> 691
>> 692 fdt_init_reserved_mem();
>> 693
>> 694 early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn));
>> 695 }
>> 696
>> 697 static void __init resource_init(void)
>> 698 {
>> 699 phys_addr_t start, end;
>> 700 u64 i;
>> 701
>> 702 if (UNCAC_BASE != IO_BASE)
>> 703 return;
>> 704
>> 705 code_resource.start = __pa_symbol(&_text);
>> 706 code_resource.end = __pa_symbol(&_etext) - 1;
>> 707 data_resource.start = __pa_symbol(&_etext);
>> 708 data_resource.end = __pa_symbol(&_edata) - 1;
>> 709 bss_resource.start = __pa_symbol(&__bss_start);
>> 710 bss_resource.end = __pa_symbol(&__bss_stop) - 1;
>> 711
>> 712 for_each_mem_range(i, &start, &end) {
>> 713 struct resource *res;
>> 714
>> 715 res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES);
>> 716 if (!res)
>> 717 panic("%s: Failed to allocate %zu bytes\n", __func__,
>> 718 sizeof(struct resource));
>> 719
>> 720 res->start = start;
>> 721 /*
>> 722 * In memblock, end points to the first byte after the
>> 723 * range while in resourses, end points to the last byte in
>> 724 * the range.
>> 725 */
>> 726 res->end = end - 1;
>> 727 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
>> 728 res->name = "System RAM";
>> 729
>> 730 request_resource(&iomem_resource, res);
>> 731
>> 732 /*
>> 733 * We don't know which RAM region contains kernel data,
>> 734 * so we try it repeatedly and let the resource manager
>> 735 * test it.
>> 736 */
>> 737 request_resource(res, &code_resource);
>> 738 request_resource(res, &data_resource);
>> 739 request_resource(res, &bss_resource);
>> 740 request_crashkernel(res);
>> 741 }
>> 742 }
>> 743
>> 744 #ifdef CONFIG_SMP
>> 745 static void __init prefill_possible_map(void)
>> 746 {
>> 747 int i, possible = num_possible_cpus();
>> 748
>> 749 if (possible > nr_cpu_ids)
>> 750 possible = nr_cpu_ids;
>> 751
>> 752 for (i = 0; i < possible; i++)
>> 753 set_cpu_possible(i, true);
>> 754 for (; i < NR_CPUS; i++)
>> 755 set_cpu_possible(i, false);
>> 756
>> 757 nr_cpu_ids = possible;
>> 758 }
>> 759 #else
>> 760 static inline void prefill_possible_map(void) {}
>> 761 #endif
>> 762
>> 763 void __init setup_arch(char **cmdline_p)
>> 764 {
>> 765 cpu_probe();
>> 766 mips_cm_probe();
>> 767 prom_init();
>> 768
>> 769 setup_early_fdc_console();
>> 770 #ifdef CONFIG_EARLY_PRINTK
>> 771 setup_early_printk();
>> 772 #endif
>> 773 cpu_report();
>> 774 check_bugs_early();
>> 775
>> 776 #if defined(CONFIG_VT)
>> 777 #if defined(CONFIG_VGA_CONSOLE)
>> 778 conswitchp = &vga_con;
>> 779 #endif
>> 780 #endif
>> 781
>> 782 arch_mem_init(cmdline_p);
>> 783 dmi_setup();
>> 784
>> 785 resource_init();
>> 786 plat_smp_setup();
>> 787 prefill_possible_map();
>> 788
>> 789 cpu_cache_init();
>> 790 paging_init();
>> 791
>> 792 memblock_dump_all();
>> 793 }
>> 794
>> 795 unsigned long kernelsp[NR_CPUS];
>> 796 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
>> 797
>> 798 #ifdef CONFIG_USE_OF
>> 799 unsigned long fw_passed_dtb;
>> 800 #endif
>> 801
>> 802 #ifdef CONFIG_DEBUG_FS
>> 803 struct dentry *mips_debugfs_dir;
>> 804 static int __init debugfs_mips(void)
>> 805 {
>> 806 mips_debugfs_dir = debugfs_create_dir("mips", NULL);
>> 807 return 0;
>> 808 }
>> 809 arch_initcall(debugfs_mips);
>> 810 #endif
>> 811
>> 812 #ifdef CONFIG_DMA_MAYBE_COHERENT
>> 813 /* User defined DMA coherency from command line. */
>> 814 enum coherent_io_user_state coherentio = IO_COHERENCE_DEFAULT;
>> 815 EXPORT_SYMBOL_GPL(coherentio);
>> 816 int hw_coherentio; /* Actual hardware supported DMA coherency setting. */
>> 817
>> 818 static int __init setcoherentio(char *str)
>> 819 {
>> 820 coherentio = IO_COHERENCE_ENABLED;
>> 821 pr_info("Hardware DMA cache coherency (command line)\n");
>> 822 return 0;
>> 823 }
>> 824 early_param("coherentio", setcoherentio);
>> 825
>> 826 static int __init setnocoherentio(char *str)
>> 827 {
>> 828 coherentio = IO_COHERENCE_DISABLED;
>> 829 pr_info("Software DMA cache coherency (command line)\n");
>> 830 return 0;
>> 831 }
>> 832 early_param("nocoherentio", setnocoherentio);
11 #endif 833 #endif
12 834
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