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/prom.h>
>> 46 #include <asm/fw/fw.h>
>> 47
>> 48 #ifdef CONFIG_MIPS_ELF_APPENDED_DTB
>> 49 char __section(".appended_dtb") __appended_dtb[0x100000];
>> 50 #endif /* CONFIG_MIPS_ELF_APPENDED_DTB */
>> 51
>> 52 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
>> 53
>> 54 EXPORT_SYMBOL(cpu_data);
>> 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 static char __initdata command_line[COMMAND_LINE_SIZE];
>> 66 char __initdata arcs_cmdline[COMMAND_LINE_SIZE];
>> 67
>> 68 #ifdef CONFIG_CMDLINE_BOOL
>> 69 static const char builtin_cmdline[] __initconst = CONFIG_CMDLINE;
>> 70 #else
>> 71 static const char builtin_cmdline[] __initconst = "";
>> 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 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 unsigned long __kaslr_offset __ro_after_init;
>> 86 EXPORT_SYMBOL(__kaslr_offset);
>> 87
>> 88 static void *detect_magic __initdata = detect_memory_region;
>> 89
>> 90 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
>> 91 unsigned long ARCH_PFN_OFFSET;
>> 92 EXPORT_SYMBOL(ARCH_PFN_OFFSET);
>> 93 #endif
>> 94
>> 95 void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max)
>> 96 {
>> 97 void *dm = &detect_magic;
>> 98 phys_addr_t size;
>> 99
>> 100 for (size = sz_min; size < sz_max; size <<= 1) {
>> 101 if (!memcmp(dm, dm + size, sizeof(detect_magic)))
>> 102 break;
>> 103 }
>> 104
>> 105 pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
>> 106 ((unsigned long long) size) / SZ_1M,
>> 107 (unsigned long long) start,
>> 108 ((unsigned long long) sz_min) / SZ_1M,
>> 109 ((unsigned long long) sz_max) / SZ_1M);
>> 110
>> 111 memblock_add(start, size);
>> 112 }
>> 113
>> 114 /*
>> 115 * Manage initrd
>> 116 */
>> 117 #ifdef CONFIG_BLK_DEV_INITRD
>> 118
>> 119 static int __init rd_start_early(char *p)
>> 120 {
>> 121 unsigned long start = memparse(p, &p);
>> 122
>> 123 #ifdef CONFIG_64BIT
>> 124 /* Guess if the sign extension was forgotten by bootloader */
>> 125 if (start < XKPHYS)
>> 126 start = (int)start;
>> 127 #endif
>> 128 initrd_start = start;
>> 129 initrd_end += start;
>> 130 return 0;
>> 131 }
>> 132 early_param("rd_start", rd_start_early);
>> 133
>> 134 static int __init rd_size_early(char *p)
>> 135 {
>> 136 initrd_end += memparse(p, &p);
>> 137 return 0;
>> 138 }
>> 139 early_param("rd_size", rd_size_early);
>> 140
>> 141 /* it returns the next free pfn after initrd */
>> 142 static unsigned long __init init_initrd(void)
>> 143 {
>> 144 unsigned long end;
>> 145
>> 146 /*
>> 147 * Board specific code or command line parser should have
>> 148 * already set up initrd_start and initrd_end. In these cases
>> 149 * perfom sanity checks and use them if all looks good.
>> 150 */
>> 151 if (!initrd_start || initrd_end <= initrd_start)
>> 152 goto disable;
>> 153
>> 154 if (initrd_start & ~PAGE_MASK) {
>> 155 pr_err("initrd start must be page aligned\n");
>> 156 goto disable;
>> 157 }
>> 158
>> 159 /*
>> 160 * Sanitize initrd addresses. For example firmware
>> 161 * can't guess if they need to pass them through
>> 162 * 64-bits values if the kernel has been built in pure
>> 163 * 32-bit. We need also to switch from KSEG0 to XKPHYS
>> 164 * addresses now, so the code can now safely use __pa().
>> 165 */
>> 166 end = __pa(initrd_end);
>> 167 initrd_end = (unsigned long)__va(end);
>> 168 initrd_start = (unsigned long)__va(__pa(initrd_start));
>> 169
>> 170 if (initrd_start < PAGE_OFFSET) {
>> 171 pr_err("initrd start < PAGE_OFFSET\n");
>> 172 goto disable;
>> 173 }
>> 174
>> 175 ROOT_DEV = Root_RAM0;
>> 176 return PFN_UP(end);
>> 177 disable:
>> 178 initrd_start = 0;
>> 179 initrd_end = 0;
>> 180 return 0;
>> 181 }
>> 182
>> 183 /* In some conditions (e.g. big endian bootloader with a little endian
>> 184 kernel), the initrd might appear byte swapped. Try to detect this and
>> 185 byte swap it if needed. */
>> 186 static void __init maybe_bswap_initrd(void)
>> 187 {
>> 188 #if defined(CONFIG_CPU_CAVIUM_OCTEON)
>> 189 u64 buf;
>> 190
>> 191 /* Check for CPIO signature */
>> 192 if (!memcmp((void *)initrd_start, "070701", 6))
>> 193 return;
>> 194
>> 195 /* Check for compressed initrd */
>> 196 if (decompress_method((unsigned char *)initrd_start, 8, NULL))
>> 197 return;
>> 198
>> 199 /* Try again with a byte swapped header */
>> 200 buf = swab64p((u64 *)initrd_start);
>> 201 if (!memcmp(&buf, "070701", 6) ||
>> 202 decompress_method((unsigned char *)(&buf), 8, NULL)) {
>> 203 unsigned long i;
>> 204
>> 205 pr_info("Byteswapped initrd detected\n");
>> 206 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8)
>> 207 swab64s((u64 *)i);
>> 208 }
>> 209 #endif
>> 210 }
>> 211
>> 212 static void __init finalize_initrd(void)
>> 213 {
>> 214 unsigned long size = initrd_end - initrd_start;
>> 215
>> 216 if (size == 0) {
>> 217 printk(KERN_INFO "Initrd not found or empty");
>> 218 goto disable;
>> 219 }
>> 220 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
>> 221 printk(KERN_ERR "Initrd extends beyond end of memory");
>> 222 goto disable;
>> 223 }
>> 224
>> 225 maybe_bswap_initrd();
>> 226
>> 227 memblock_reserve(__pa(initrd_start), size);
>> 228 initrd_below_start_ok = 1;
>> 229
>> 230 pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
>> 231 initrd_start, size);
>> 232 return;
>> 233 disable:
>> 234 printk(KERN_CONT " - disabling initrd\n");
>> 235 initrd_start = 0;
>> 236 initrd_end = 0;
>> 237 }
>> 238
>> 239 #else /* !CONFIG_BLK_DEV_INITRD */
>> 240
>> 241 static unsigned long __init init_initrd(void)
>> 242 {
>> 243 return 0;
>> 244 }
>> 245
>> 246 #define finalize_initrd() do {} while (0)
>> 247
>> 248 #endif
>> 249
>> 250 /*
>> 251 * Initialize the bootmem allocator. It also setup initrd related data
>> 252 * if needed.
>> 253 */
>> 254 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON64) && defined(CONFIG_NUMA))
>> 255
>> 256 static void __init bootmem_init(void)
>> 257 {
>> 258 init_initrd();
>> 259 finalize_initrd();
>> 260 }
>> 261
>> 262 #else /* !CONFIG_SGI_IP27 */
>> 263
>> 264 static void __init bootmem_init(void)
>> 265 {
>> 266 phys_addr_t ramstart, ramend;
>> 267 unsigned long start, end;
>> 268 int i;
>> 269
>> 270 ramstart = memblock_start_of_DRAM();
>> 271 ramend = memblock_end_of_DRAM();
>> 272
>> 273 /*
>> 274 * Sanity check any INITRD first. We don't take it into account
>> 275 * for bootmem setup initially, rely on the end-of-kernel-code
>> 276 * as our memory range starting point. Once bootmem is inited we
>> 277 * will reserve the area used for the initrd.
>> 278 */
>> 279 init_initrd();
>> 280
>> 281 /* Reserve memory occupied by kernel. */
>> 282 memblock_reserve(__pa_symbol(&_text),
>> 283 __pa_symbol(&_end) - __pa_symbol(&_text));
>> 284
>> 285 /* max_low_pfn is not a number of pages but the end pfn of low mem */
>> 286
>> 287 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
>> 288 ARCH_PFN_OFFSET = PFN_UP(ramstart);
>> 289 #else
>> 290 /*
>> 291 * Reserve any memory between the start of RAM and PHYS_OFFSET
>> 292 */
>> 293 if (ramstart > PHYS_OFFSET)
>> 294 memblock_reserve(PHYS_OFFSET, ramstart - PHYS_OFFSET);
>> 295
>> 296 if (PFN_UP(ramstart) > ARCH_PFN_OFFSET) {
>> 297 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
>> 298 (unsigned long)((PFN_UP(ramstart) - ARCH_PFN_OFFSET) * sizeof(struct page)),
>> 299 (unsigned long)(PFN_UP(ramstart) - ARCH_PFN_OFFSET));
>> 300 }
>> 301 #endif
>> 302
>> 303 min_low_pfn = ARCH_PFN_OFFSET;
>> 304 max_pfn = PFN_DOWN(ramend);
>> 305 for_each_mem_pfn_range(i, MAX_NUMNODES, &start, &end, NULL) {
>> 306 /*
>> 307 * Skip highmem here so we get an accurate max_low_pfn if low
>> 308 * memory stops short of high memory.
>> 309 * If the region overlaps HIGHMEM_START, end is clipped so
>> 310 * max_pfn excludes the highmem portion.
>> 311 */
>> 312 if (start >= PFN_DOWN(HIGHMEM_START))
>> 313 continue;
>> 314 if (end > PFN_DOWN(HIGHMEM_START))
>> 315 end = PFN_DOWN(HIGHMEM_START);
>> 316 if (end > max_low_pfn)
>> 317 max_low_pfn = end;
>> 318 }
>> 319
>> 320 if (min_low_pfn >= max_low_pfn)
>> 321 panic("Incorrect memory mapping !!!");
>> 322
>> 323 if (max_pfn > PFN_DOWN(HIGHMEM_START)) {
>> 324 max_low_pfn = PFN_DOWN(HIGHMEM_START);
>> 325 #ifdef CONFIG_HIGHMEM
>> 326 highstart_pfn = max_low_pfn;
>> 327 highend_pfn = max_pfn;
4 #else 328 #else
5 #include "setup_no.c" !! 329 max_pfn = max_low_pfn;
6 #endif 330 #endif
>> 331 }
>> 332
>> 333 /*
>> 334 * Reserve initrd memory if needed.
>> 335 */
>> 336 finalize_initrd();
>> 337 }
>> 338
>> 339 #endif /* CONFIG_SGI_IP27 */
>> 340
>> 341 static int usermem __initdata;
>> 342
>> 343 static int __init early_parse_mem(char *p)
>> 344 {
>> 345 phys_addr_t start, size;
>> 346
>> 347 if (!p) {
>> 348 pr_err("mem parameter is empty, do nothing\n");
>> 349 return -EINVAL;
>> 350 }
>> 351
>> 352 /*
>> 353 * If a user specifies memory size, we
>> 354 * blow away any automatically generated
>> 355 * size.
>> 356 */
>> 357 if (usermem == 0) {
>> 358 usermem = 1;
>> 359 memblock_remove(memblock_start_of_DRAM(),
>> 360 memblock_end_of_DRAM() - memblock_start_of_DRAM());
>> 361 }
>> 362 start = 0;
>> 363 size = memparse(p, &p);
>> 364 if (*p == '@')
>> 365 start = memparse(p + 1, &p);
>> 366
>> 367 if (IS_ENABLED(CONFIG_NUMA))
>> 368 memblock_add_node(start, size, pa_to_nid(start), MEMBLOCK_NONE);
>> 369 else
>> 370 memblock_add(start, size);
>> 371
>> 372 return 0;
>> 373 }
>> 374 early_param("mem", early_parse_mem);
7 375
8 #if IS_ENABLED(CONFIG_INPUT_M68K_BEEP) !! 376 static int __init early_parse_memmap(char *p)
9 void (*mach_beep)(unsigned int, unsigned int); !! 377 {
10 EXPORT_SYMBOL(mach_beep); !! 378 char *oldp;
>> 379 u64 start_at, mem_size;
>> 380
>> 381 if (!p)
>> 382 return -EINVAL;
>> 383
>> 384 if (!strncmp(p, "exactmap", 8)) {
>> 385 pr_err("\"memmap=exactmap\" invalid on MIPS\n");
>> 386 return 0;
>> 387 }
>> 388
>> 389 oldp = p;
>> 390 mem_size = memparse(p, &p);
>> 391 if (p == oldp)
>> 392 return -EINVAL;
>> 393
>> 394 if (*p == '@') {
>> 395 start_at = memparse(p+1, &p);
>> 396 memblock_add(start_at, mem_size);
>> 397 } else if (*p == '#') {
>> 398 pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n");
>> 399 return -EINVAL;
>> 400 } else if (*p == '$') {
>> 401 start_at = memparse(p+1, &p);
>> 402 memblock_add(start_at, mem_size);
>> 403 memblock_reserve(start_at, mem_size);
>> 404 } else {
>> 405 pr_err("\"memmap\" invalid format!\n");
>> 406 return -EINVAL;
>> 407 }
>> 408
>> 409 if (*p == '\0') {
>> 410 usermem = 1;
>> 411 return 0;
>> 412 } else
>> 413 return -EINVAL;
>> 414 }
>> 415 early_param("memmap", early_parse_memmap);
>> 416
>> 417 static void __init mips_reserve_vmcore(void)
>> 418 {
>> 419 #ifdef CONFIG_PROC_VMCORE
>> 420 phys_addr_t start, end;
>> 421 u64 i;
>> 422
>> 423 if (!elfcorehdr_size) {
>> 424 for_each_mem_range(i, &start, &end) {
>> 425 if (elfcorehdr_addr >= start && elfcorehdr_addr < end) {
>> 426 /*
>> 427 * Reserve from the elf core header to the end of
>> 428 * the memory segment, that should all be kdump
>> 429 * reserved memory.
>> 430 */
>> 431 elfcorehdr_size = end - elfcorehdr_addr;
>> 432 break;
>> 433 }
>> 434 }
>> 435 }
>> 436
>> 437 pr_info("Reserving %ldKB of memory at %ldKB for kdump\n",
>> 438 (unsigned long)elfcorehdr_size >> 10, (unsigned long)elfcorehdr_addr >> 10);
>> 439
>> 440 memblock_reserve(elfcorehdr_addr, elfcorehdr_size);
11 #endif 441 #endif
>> 442 }
>> 443
>> 444 #ifdef CONFIG_KEXEC
>> 445
>> 446 /* 64M alignment for crash kernel regions */
>> 447 #define CRASH_ALIGN SZ_64M
>> 448 #define CRASH_ADDR_MAX SZ_512M
>> 449
>> 450 static void __init mips_parse_crashkernel(void)
>> 451 {
>> 452 unsigned long long total_mem;
>> 453 unsigned long long crash_size, crash_base;
>> 454 int ret;
>> 455
>> 456 total_mem = memblock_phys_mem_size();
>> 457 ret = parse_crashkernel(boot_command_line, total_mem,
>> 458 &crash_size, &crash_base,
>> 459 NULL, NULL);
>> 460 if (ret != 0 || crash_size <= 0)
>> 461 return;
>> 462
>> 463 if (crash_base <= 0) {
>> 464 crash_base = memblock_phys_alloc_range(crash_size, CRASH_ALIGN,
>> 465 CRASH_ALIGN,
>> 466 CRASH_ADDR_MAX);
>> 467 if (!crash_base) {
>> 468 pr_warn("crashkernel reservation failed - No suitable area found.\n");
>> 469 return;
>> 470 }
>> 471 } else {
>> 472 unsigned long long start;
>> 473
>> 474 start = memblock_phys_alloc_range(crash_size, 1,
>> 475 crash_base,
>> 476 crash_base + crash_size);
>> 477 if (start != crash_base) {
>> 478 pr_warn("Invalid memory region reserved for crash kernel\n");
>> 479 return;
>> 480 }
>> 481 }
>> 482
>> 483 crashk_res.start = crash_base;
>> 484 crashk_res.end = crash_base + crash_size - 1;
>> 485 }
>> 486
>> 487 static void __init request_crashkernel(struct resource *res)
>> 488 {
>> 489 int ret;
>> 490
>> 491 if (crashk_res.start == crashk_res.end)
>> 492 return;
>> 493
>> 494 ret = request_resource(res, &crashk_res);
>> 495 if (!ret)
>> 496 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
>> 497 (unsigned long)(resource_size(&crashk_res) >> 20),
>> 498 (unsigned long)(crashk_res.start >> 20));
>> 499 }
>> 500 #else /* !defined(CONFIG_KEXEC) */
>> 501 static void __init mips_parse_crashkernel(void)
>> 502 {
>> 503 }
>> 504
>> 505 static void __init request_crashkernel(struct resource *res)
>> 506 {
>> 507 }
>> 508 #endif /* !defined(CONFIG_KEXEC) */
>> 509
>> 510 static void __init check_kernel_sections_mem(void)
>> 511 {
>> 512 phys_addr_t start = __pa_symbol(&_text);
>> 513 phys_addr_t size = __pa_symbol(&_end) - start;
>> 514
>> 515 if (!memblock_is_region_memory(start, size)) {
>> 516 pr_info("Kernel sections are not in the memory maps\n");
>> 517 memblock_add(start, size);
>> 518 }
>> 519 }
>> 520
>> 521 static void __init bootcmdline_append(const char *s, size_t max)
>> 522 {
>> 523 if (!s[0] || !max)
>> 524 return;
>> 525
>> 526 if (boot_command_line[0])
>> 527 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
>> 528
>> 529 strlcat(boot_command_line, s, max);
>> 530 }
>> 531
>> 532 #ifdef CONFIG_OF_EARLY_FLATTREE
>> 533
>> 534 static int __init bootcmdline_scan_chosen(unsigned long node, const char *uname,
>> 535 int depth, void *data)
>> 536 {
>> 537 bool *dt_bootargs = data;
>> 538 const char *p;
>> 539 int l;
>> 540
>> 541 if (depth != 1 || !data ||
>> 542 (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
>> 543 return 0;
>> 544
>> 545 p = of_get_flat_dt_prop(node, "bootargs", &l);
>> 546 if (p != NULL && l > 0) {
>> 547 bootcmdline_append(p, min(l, COMMAND_LINE_SIZE));
>> 548 *dt_bootargs = true;
>> 549 }
>> 550
>> 551 return 1;
>> 552 }
>> 553
>> 554 #endif /* CONFIG_OF_EARLY_FLATTREE */
>> 555
>> 556 static void __init bootcmdline_init(void)
>> 557 {
>> 558 bool dt_bootargs = false;
>> 559
>> 560 /*
>> 561 * If CMDLINE_OVERRIDE is enabled then initializing the command line is
>> 562 * trivial - we simply use the built-in command line unconditionally &
>> 563 * unmodified.
>> 564 */
>> 565 if (IS_ENABLED(CONFIG_CMDLINE_OVERRIDE)) {
>> 566 strscpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
>> 567 return;
>> 568 }
>> 569
>> 570 /*
>> 571 * If the user specified a built-in command line &
>> 572 * MIPS_CMDLINE_BUILTIN_EXTEND, then the built-in command line is
>> 573 * prepended to arguments from the bootloader or DT so we'll copy them
>> 574 * to the start of boot_command_line here. Otherwise, empty
>> 575 * boot_command_line to undo anything early_init_dt_scan_chosen() did.
>> 576 */
>> 577 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND))
>> 578 strscpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
>> 579 else
>> 580 boot_command_line[0] = 0;
>> 581
>> 582 #ifdef CONFIG_OF_EARLY_FLATTREE
>> 583 /*
>> 584 * If we're configured to take boot arguments from DT, look for those
>> 585 * now.
>> 586 */
>> 587 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB) ||
>> 588 IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND))
>> 589 of_scan_flat_dt(bootcmdline_scan_chosen, &dt_bootargs);
>> 590 #endif
>> 591
>> 592 /*
>> 593 * If we didn't get any arguments from DT (regardless of whether that's
>> 594 * because we weren't configured to look for them, or because we looked
>> 595 * & found none) then we'll take arguments from the bootloader.
>> 596 * plat_mem_setup() should have filled arcs_cmdline with arguments from
>> 597 * the bootloader.
>> 598 */
>> 599 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND) || !dt_bootargs)
>> 600 bootcmdline_append(arcs_cmdline, COMMAND_LINE_SIZE);
>> 601
>> 602 /*
>> 603 * If the user specified a built-in command line & we didn't already
>> 604 * prepend it, we append it to boot_command_line here.
>> 605 */
>> 606 if (IS_ENABLED(CONFIG_CMDLINE_BOOL) &&
>> 607 !IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND))
>> 608 bootcmdline_append(builtin_cmdline, COMMAND_LINE_SIZE);
>> 609 }
>> 610
>> 611 /*
>> 612 * arch_mem_init - initialize memory management subsystem
>> 613 *
>> 614 * o plat_mem_setup() detects the memory configuration and will record detected
>> 615 * memory areas using memblock_add.
>> 616 *
>> 617 * At this stage the memory configuration of the system is known to the
>> 618 * kernel but generic memory management system is still entirely uninitialized.
>> 619 *
>> 620 * o bootmem_init()
>> 621 * o sparse_init()
>> 622 * o paging_init()
>> 623 * o dma_contiguous_reserve()
>> 624 *
>> 625 * At this stage the bootmem allocator is ready to use.
>> 626 *
>> 627 * NOTE: historically plat_mem_setup did the entire platform initialization.
>> 628 * This was rather impractical because it meant plat_mem_setup had to
>> 629 * get away without any kind of memory allocator. To keep old code from
>> 630 * breaking plat_setup was just renamed to plat_mem_setup and a second platform
>> 631 * initialization hook for anything else was introduced.
>> 632 */
>> 633 static void __init arch_mem_init(char **cmdline_p)
>> 634 {
>> 635 /* call board setup routine */
>> 636 plat_mem_setup();
>> 637 memblock_set_bottom_up(true);
>> 638
>> 639 bootcmdline_init();
>> 640 strscpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
>> 641 *cmdline_p = command_line;
>> 642
>> 643 parse_early_param();
>> 644
>> 645 if (usermem)
>> 646 pr_info("User-defined physical RAM map overwrite\n");
>> 647
>> 648 check_kernel_sections_mem();
>> 649
>> 650 early_init_fdt_reserve_self();
>> 651 early_init_fdt_scan_reserved_mem();
>> 652
>> 653 #ifndef CONFIG_NUMA
>> 654 memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0);
>> 655 #endif
>> 656 bootmem_init();
>> 657
>> 658 /*
>> 659 * Prevent memblock from allocating high memory.
>> 660 * This cannot be done before max_low_pfn is detected, so up
>> 661 * to this point is possible to only reserve physical memory
>> 662 * with memblock_reserve; memblock_alloc* can be used
>> 663 * only after this point
>> 664 */
>> 665 memblock_set_current_limit(PFN_PHYS(max_low_pfn));
>> 666
>> 667 mips_reserve_vmcore();
>> 668
>> 669 mips_parse_crashkernel();
>> 670 device_tree_init();
>> 671
>> 672 /*
>> 673 * In order to reduce the possibility of kernel panic when failed to
>> 674 * get IO TLB memory under CONFIG_SWIOTLB, it is better to allocate
>> 675 * low memory as small as possible before plat_swiotlb_setup(), so
>> 676 * make sparse_init() using top-down allocation.
>> 677 */
>> 678 memblock_set_bottom_up(false);
>> 679 sparse_init();
>> 680 memblock_set_bottom_up(true);
>> 681
>> 682 plat_swiotlb_setup();
>> 683
>> 684 dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
>> 685
>> 686 /* Reserve for hibernation. */
>> 687 memblock_reserve(__pa_symbol(&__nosave_begin),
>> 688 __pa_symbol(&__nosave_end) - __pa_symbol(&__nosave_begin));
>> 689
>> 690 early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn));
>> 691 }
>> 692
>> 693 static void __init resource_init(void)
>> 694 {
>> 695 phys_addr_t start, end;
>> 696 u64 i;
>> 697
>> 698 if (UNCAC_BASE != IO_BASE)
>> 699 return;
>> 700
>> 701 code_resource.start = __pa_symbol(&_text);
>> 702 code_resource.end = __pa_symbol(&_etext) - 1;
>> 703 data_resource.start = __pa_symbol(&_etext);
>> 704 data_resource.end = __pa_symbol(&_edata) - 1;
>> 705 bss_resource.start = __pa_symbol(&__bss_start);
>> 706 bss_resource.end = __pa_symbol(&__bss_stop) - 1;
>> 707
>> 708 for_each_mem_range(i, &start, &end) {
>> 709 struct resource *res;
>> 710
>> 711 res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES);
>> 712 if (!res)
>> 713 panic("%s: Failed to allocate %zu bytes\n", __func__,
>> 714 sizeof(struct resource));
>> 715
>> 716 res->start = start;
>> 717 /*
>> 718 * In memblock, end points to the first byte after the
>> 719 * range while in resourses, end points to the last byte in
>> 720 * the range.
>> 721 */
>> 722 res->end = end - 1;
>> 723 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
>> 724 res->name = "System RAM";
>> 725
>> 726 request_resource(&iomem_resource, res);
>> 727
>> 728 /*
>> 729 * We don't know which RAM region contains kernel data,
>> 730 * so we try it repeatedly and let the resource manager
>> 731 * test it.
>> 732 */
>> 733 request_resource(res, &code_resource);
>> 734 request_resource(res, &data_resource);
>> 735 request_resource(res, &bss_resource);
>> 736 request_crashkernel(res);
>> 737 }
>> 738 }
>> 739
>> 740 #ifdef CONFIG_SMP
>> 741 static void __init prefill_possible_map(void)
>> 742 {
>> 743 int i, possible = num_possible_cpus();
>> 744
>> 745 if (possible > nr_cpu_ids)
>> 746 possible = nr_cpu_ids;
>> 747
>> 748 for (i = 0; i < possible; i++)
>> 749 set_cpu_possible(i, true);
>> 750 for (; i < NR_CPUS; i++)
>> 751 set_cpu_possible(i, false);
>> 752
>> 753 set_nr_cpu_ids(possible);
>> 754 }
>> 755 #else
>> 756 static inline void prefill_possible_map(void) {}
>> 757 #endif
>> 758
>> 759 static void __init setup_rng_seed(void)
>> 760 {
>> 761 char *rng_seed_hex = fw_getenv("rngseed");
>> 762 u8 rng_seed[512];
>> 763 size_t len;
>> 764
>> 765 if (!rng_seed_hex)
>> 766 return;
>> 767
>> 768 len = min(sizeof(rng_seed), strlen(rng_seed_hex) / 2);
>> 769 if (hex2bin(rng_seed, rng_seed_hex, len))
>> 770 return;
>> 771
>> 772 add_bootloader_randomness(rng_seed, len);
>> 773 memzero_explicit(rng_seed, len);
>> 774 memzero_explicit(rng_seed_hex, len * 2);
>> 775 }
>> 776
>> 777 void __init setup_arch(char **cmdline_p)
>> 778 {
>> 779 cpu_probe();
>> 780 mips_cm_probe();
>> 781 prom_init();
>> 782
>> 783 setup_early_fdc_console();
>> 784 #ifdef CONFIG_EARLY_PRINTK
>> 785 setup_early_printk();
>> 786 #endif
>> 787 cpu_report();
>> 788 if (IS_ENABLED(CONFIG_CPU_R4X00_BUGS64))
>> 789 check_bugs64_early();
>> 790
>> 791 arch_mem_init(cmdline_p);
>> 792 dmi_setup();
>> 793
>> 794 resource_init();
>> 795 plat_smp_setup();
>> 796 prefill_possible_map();
>> 797
>> 798 cpu_cache_init();
>> 799 paging_init();
>> 800
>> 801 memblock_dump_all();
>> 802
>> 803 setup_rng_seed();
>> 804 }
>> 805
>> 806 unsigned long kernelsp[NR_CPUS];
>> 807 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
>> 808
>> 809 #ifdef CONFIG_DEBUG_FS
>> 810 struct dentry *mips_debugfs_dir;
>> 811 static int __init debugfs_mips(void)
>> 812 {
>> 813 mips_debugfs_dir = debugfs_create_dir("mips", NULL);
>> 814 return 0;
>> 815 }
>> 816 arch_initcall(debugfs_mips);
>> 817 #endif
>> 818
>> 819 #ifdef CONFIG_DMA_NONCOHERENT
>> 820 static int __init setcoherentio(char *str)
>> 821 {
>> 822 dma_default_coherent = true;
>> 823 pr_info("Hardware DMA cache coherency (command line)\n");
>> 824 return 0;
>> 825 }
>> 826 early_param("coherentio", setcoherentio);
>> 827
>> 828 static int __init setnocoherentio(char *str)
>> 829 {
>> 830 dma_default_coherent = false;
>> 831 pr_info("Software DMA cache coherency (command line)\n");
>> 832 return 0;
>> 833 }
>> 834 early_param("nocoherentio", setnocoherentio);
>> 835 #endif
>> 836
>> 837 void __init arch_cpu_finalize_init(void)
>> 838 {
>> 839 unsigned int cpu = smp_processor_id();
>> 840
>> 841 cpu_data[cpu].udelay_val = loops_per_jiffy;
>> 842 check_bugs32();
>> 843
>> 844 if (IS_ENABLED(CONFIG_CPU_R4X00_BUGS64))
>> 845 check_bugs64();
>> 846 }
12 847
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