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/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;
4 #else 329 #else
5 #include "setup_no.c" !! 330 max_pfn = max_low_pfn;
6 #endif 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);
7 376
8 #if IS_ENABLED(CONFIG_INPUT_M68K_BEEP) !! 377 static int __init early_parse_memmap(char *p)
9 void (*mach_beep)(unsigned int, unsigned int); !! 378 {
10 EXPORT_SYMBOL(mach_beep); !! 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);
11 #endif 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 }
12 848
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