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-contiguous.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 static void *detect_magic __initdata = detect_memory_region;
>> 88
>> 89 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
>> 90 unsigned long ARCH_PFN_OFFSET;
>> 91 EXPORT_SYMBOL(ARCH_PFN_OFFSET);
>> 92 #endif
>> 93
>> 94 void __init add_memory_region(phys_addr_t start, phys_addr_t size, long type)
>> 95 {
>> 96 /*
>> 97 * Note: This function only exists for historical reason,
>> 98 * new code should use memblock_add or memblock_add_node instead.
>> 99 */
>> 100
>> 101 /*
>> 102 * If the region reaches the top of the physical address space, adjust
>> 103 * the size slightly so that (start + size) doesn't overflow
>> 104 */
>> 105 if (start + size - 1 == PHYS_ADDR_MAX)
>> 106 --size;
>> 107
>> 108 /* Sanity check */
>> 109 if (start + size < start) {
>> 110 pr_warn("Trying to add an invalid memory region, skipped\n");
>> 111 return;
>> 112 }
>> 113
>> 114 if (start < PHYS_OFFSET)
>> 115 return;
>> 116
>> 117 memblock_add(start, size);
>> 118 /* Reserve any memory except the ordinary RAM ranges. */
>> 119 switch (type) {
>> 120 case BOOT_MEM_RAM:
>> 121 break;
>> 122
>> 123 case BOOT_MEM_NOMAP: /* Discard the range from the system. */
>> 124 memblock_remove(start, size);
>> 125 break;
>> 126
>> 127 default: /* Reserve the rest of the memory types at boot time */
>> 128 memblock_reserve(start, size);
>> 129 break;
>> 130 }
>> 131 }
>> 132
>> 133 void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max)
>> 134 {
>> 135 void *dm = &detect_magic;
>> 136 phys_addr_t size;
>> 137
>> 138 for (size = sz_min; size < sz_max; size <<= 1) {
>> 139 if (!memcmp(dm, dm + size, sizeof(detect_magic)))
>> 140 break;
>> 141 }
>> 142
>> 143 pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
>> 144 ((unsigned long long) size) / SZ_1M,
>> 145 (unsigned long long) start,
>> 146 ((unsigned long long) sz_min) / SZ_1M,
>> 147 ((unsigned long long) sz_max) / SZ_1M);
>> 148
>> 149 add_memory_region(start, size, BOOT_MEM_RAM);
>> 150 }
>> 151
>> 152 /*
>> 153 * Manage initrd
>> 154 */
>> 155 #ifdef CONFIG_BLK_DEV_INITRD
>> 156
>> 157 static int __init rd_start_early(char *p)
>> 158 {
>> 159 unsigned long start = memparse(p, &p);
>> 160
>> 161 #ifdef CONFIG_64BIT
>> 162 /* Guess if the sign extension was forgotten by bootloader */
>> 163 if (start < XKPHYS)
>> 164 start = (int)start;
>> 165 #endif
>> 166 initrd_start = start;
>> 167 initrd_end += start;
>> 168 return 0;
>> 169 }
>> 170 early_param("rd_start", rd_start_early);
>> 171
>> 172 static int __init rd_size_early(char *p)
>> 173 {
>> 174 initrd_end += memparse(p, &p);
>> 175 return 0;
>> 176 }
>> 177 early_param("rd_size", rd_size_early);
>> 178
>> 179 /* it returns the next free pfn after initrd */
>> 180 static unsigned long __init init_initrd(void)
>> 181 {
>> 182 unsigned long end;
>> 183
>> 184 /*
>> 185 * Board specific code or command line parser should have
>> 186 * already set up initrd_start and initrd_end. In these cases
>> 187 * perfom sanity checks and use them if all looks good.
>> 188 */
>> 189 if (!initrd_start || initrd_end <= initrd_start)
>> 190 goto disable;
>> 191
>> 192 if (initrd_start & ~PAGE_MASK) {
>> 193 pr_err("initrd start must be page aligned\n");
>> 194 goto disable;
>> 195 }
>> 196 if (initrd_start < PAGE_OFFSET) {
>> 197 pr_err("initrd start < PAGE_OFFSET\n");
>> 198 goto disable;
>> 199 }
>> 200
>> 201 /*
>> 202 * Sanitize initrd addresses. For example firmware
>> 203 * can't guess if they need to pass them through
>> 204 * 64-bits values if the kernel has been built in pure
>> 205 * 32-bit. We need also to switch from KSEG0 to XKPHYS
>> 206 * addresses now, so the code can now safely use __pa().
>> 207 */
>> 208 end = __pa(initrd_end);
>> 209 initrd_end = (unsigned long)__va(end);
>> 210 initrd_start = (unsigned long)__va(__pa(initrd_start));
>> 211
>> 212 ROOT_DEV = Root_RAM0;
>> 213 return PFN_UP(end);
>> 214 disable:
>> 215 initrd_start = 0;
>> 216 initrd_end = 0;
>> 217 return 0;
>> 218 }
>> 219
>> 220 /* In some conditions (e.g. big endian bootloader with a little endian
>> 221 kernel), the initrd might appear byte swapped. Try to detect this and
>> 222 byte swap it if needed. */
>> 223 static void __init maybe_bswap_initrd(void)
>> 224 {
>> 225 #if defined(CONFIG_CPU_CAVIUM_OCTEON)
>> 226 u64 buf;
>> 227
>> 228 /* Check for CPIO signature */
>> 229 if (!memcmp((void *)initrd_start, "070701", 6))
>> 230 return;
>> 231
>> 232 /* Check for compressed initrd */
>> 233 if (decompress_method((unsigned char *)initrd_start, 8, NULL))
>> 234 return;
>> 235
>> 236 /* Try again with a byte swapped header */
>> 237 buf = swab64p((u64 *)initrd_start);
>> 238 if (!memcmp(&buf, "070701", 6) ||
>> 239 decompress_method((unsigned char *)(&buf), 8, NULL)) {
>> 240 unsigned long i;
>> 241
>> 242 pr_info("Byteswapped initrd detected\n");
>> 243 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8)
>> 244 swab64s((u64 *)i);
>> 245 }
>> 246 #endif
>> 247 }
>> 248
>> 249 static void __init finalize_initrd(void)
>> 250 {
>> 251 unsigned long size = initrd_end - initrd_start;
>> 252
>> 253 if (size == 0) {
>> 254 printk(KERN_INFO "Initrd not found or empty");
>> 255 goto disable;
>> 256 }
>> 257 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
>> 258 printk(KERN_ERR "Initrd extends beyond end of memory");
>> 259 goto disable;
>> 260 }
>> 261
>> 262 maybe_bswap_initrd();
>> 263
>> 264 memblock_reserve(__pa(initrd_start), size);
>> 265 initrd_below_start_ok = 1;
>> 266
>> 267 pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
>> 268 initrd_start, size);
>> 269 return;
>> 270 disable:
>> 271 printk(KERN_CONT " - disabling initrd\n");
>> 272 initrd_start = 0;
>> 273 initrd_end = 0;
>> 274 }
>> 275
>> 276 #else /* !CONFIG_BLK_DEV_INITRD */
>> 277
>> 278 static unsigned long __init init_initrd(void)
>> 279 {
>> 280 return 0;
>> 281 }
>> 282
>> 283 #define finalize_initrd() do {} while (0)
>> 284
>> 285 #endif
>> 286
>> 287 /*
>> 288 * Initialize the bootmem allocator. It also setup initrd related data
>> 289 * if needed.
>> 290 */
>> 291 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON64) && defined(CONFIG_NUMA))
>> 292
>> 293 static void __init bootmem_init(void)
>> 294 {
>> 295 init_initrd();
>> 296 finalize_initrd();
>> 297 }
>> 298
>> 299 #else /* !CONFIG_SGI_IP27 */
>> 300
>> 301 static void __init bootmem_init(void)
>> 302 {
>> 303 struct memblock_region *mem;
>> 304 phys_addr_t ramstart, ramend;
>> 305
>> 306 ramstart = memblock_start_of_DRAM();
>> 307 ramend = memblock_end_of_DRAM();
>> 308
>> 309 /*
>> 310 * Sanity check any INITRD first. We don't take it into account
>> 311 * for bootmem setup initially, rely on the end-of-kernel-code
>> 312 * as our memory range starting point. Once bootmem is inited we
>> 313 * will reserve the area used for the initrd.
>> 314 */
>> 315 init_initrd();
>> 316
>> 317 /* Reserve memory occupied by kernel. */
>> 318 memblock_reserve(__pa_symbol(&_text),
>> 319 __pa_symbol(&_end) - __pa_symbol(&_text));
>> 320
>> 321 /* max_low_pfn is not a number of pages but the end pfn of low mem */
>> 322
>> 323 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
>> 324 ARCH_PFN_OFFSET = PFN_UP(ramstart);
>> 325 #else
>> 326 /*
>> 327 * Reserve any memory between the start of RAM and PHYS_OFFSET
>> 328 */
>> 329 if (ramstart > PHYS_OFFSET)
>> 330 memblock_reserve(PHYS_OFFSET, ramstart - PHYS_OFFSET);
>> 331
>> 332 if (PFN_UP(ramstart) > ARCH_PFN_OFFSET) {
>> 333 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
>> 334 (unsigned long)((PFN_UP(ramstart) - ARCH_PFN_OFFSET) * sizeof(struct page)),
>> 335 (unsigned long)(PFN_UP(ramstart) - ARCH_PFN_OFFSET));
>> 336 }
>> 337 #endif
>> 338
>> 339 min_low_pfn = ARCH_PFN_OFFSET;
>> 340 max_pfn = PFN_DOWN(ramend);
>> 341 for_each_memblock(memory, mem) {
>> 342 unsigned long start = memblock_region_memory_base_pfn(mem);
>> 343 unsigned long end = memblock_region_memory_end_pfn(mem);
>> 344
>> 345 /*
>> 346 * Skip highmem here so we get an accurate max_low_pfn if low
>> 347 * memory stops short of high memory.
>> 348 * If the region overlaps HIGHMEM_START, end is clipped so
>> 349 * max_pfn excludes the highmem portion.
>> 350 */
>> 351 if (memblock_is_nomap(mem))
>> 352 continue;
>> 353 if (start >= PFN_DOWN(HIGHMEM_START))
>> 354 continue;
>> 355 if (end > PFN_DOWN(HIGHMEM_START))
>> 356 end = PFN_DOWN(HIGHMEM_START);
>> 357 if (end > max_low_pfn)
>> 358 max_low_pfn = end;
>> 359 }
>> 360
>> 361 if (min_low_pfn >= max_low_pfn)
>> 362 panic("Incorrect memory mapping !!!");
>> 363
>> 364 if (max_pfn > PFN_DOWN(HIGHMEM_START)) {
>> 365 #ifdef CONFIG_HIGHMEM
>> 366 highstart_pfn = PFN_DOWN(HIGHMEM_START);
>> 367 highend_pfn = max_pfn;
>> 368 #else
>> 369 max_low_pfn = PFN_DOWN(HIGHMEM_START);
>> 370 max_pfn = max_low_pfn;
>> 371 #endif
>> 372 }
>> 373
>> 374
>> 375 /*
>> 376 * In any case the added to the memblock memory regions
>> 377 * (highmem/lowmem, available/reserved, etc) are considered
>> 378 * as present, so inform sparsemem about them.
>> 379 */
>> 380 memblocks_present();
>> 381
>> 382 /*
>> 383 * Reserve initrd memory if needed.
>> 384 */
>> 385 finalize_initrd();
>> 386 }
>> 387
>> 388 #endif /* CONFIG_SGI_IP27 */
>> 389
>> 390 static int usermem __initdata;
>> 391
>> 392 static int __init early_parse_mem(char *p)
>> 393 {
>> 394 phys_addr_t start, size;
>> 395
>> 396 /*
>> 397 * If a user specifies memory size, we
>> 398 * blow away any automatically generated
>> 399 * size.
>> 400 */
>> 401 if (usermem == 0) {
>> 402 usermem = 1;
>> 403 memblock_remove(memblock_start_of_DRAM(),
>> 404 memblock_end_of_DRAM() - memblock_start_of_DRAM());
>> 405 }
>> 406 start = 0;
>> 407 size = memparse(p, &p);
>> 408 if (*p == '@')
>> 409 start = memparse(p + 1, &p);
>> 410
>> 411 add_memory_region(start, size, BOOT_MEM_RAM);
>> 412
>> 413 return 0;
>> 414 }
>> 415 early_param("mem", early_parse_mem);
>> 416
>> 417 static int __init early_parse_memmap(char *p)
>> 418 {
>> 419 char *oldp;
>> 420 u64 start_at, mem_size;
>> 421
>> 422 if (!p)
>> 423 return -EINVAL;
>> 424
>> 425 if (!strncmp(p, "exactmap", 8)) {
>> 426 pr_err("\"memmap=exactmap\" invalid on MIPS\n");
>> 427 return 0;
>> 428 }
>> 429
>> 430 oldp = p;
>> 431 mem_size = memparse(p, &p);
>> 432 if (p == oldp)
>> 433 return -EINVAL;
>> 434
>> 435 if (*p == '@') {
>> 436 start_at = memparse(p+1, &p);
>> 437 add_memory_region(start_at, mem_size, BOOT_MEM_RAM);
>> 438 } else if (*p == '#') {
>> 439 pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n");
>> 440 return -EINVAL;
>> 441 } else if (*p == '$') {
>> 442 start_at = memparse(p+1, &p);
>> 443 add_memory_region(start_at, mem_size, BOOT_MEM_RESERVED);
>> 444 } else {
>> 445 pr_err("\"memmap\" invalid format!\n");
>> 446 return -EINVAL;
>> 447 }
>> 448
>> 449 if (*p == '\0') {
>> 450 usermem = 1;
>> 451 return 0;
>> 452 } else
>> 453 return -EINVAL;
>> 454 }
>> 455 early_param("memmap", early_parse_memmap);
>> 456
>> 457 #ifdef CONFIG_PROC_VMCORE
>> 458 unsigned long setup_elfcorehdr, setup_elfcorehdr_size;
>> 459 static int __init early_parse_elfcorehdr(char *p)
>> 460 {
>> 461 struct memblock_region *mem;
>> 462
>> 463 setup_elfcorehdr = memparse(p, &p);
>> 464
>> 465 for_each_memblock(memory, mem) {
>> 466 unsigned long start = mem->base;
>> 467 unsigned long end = start + mem->size;
>> 468 if (setup_elfcorehdr >= start && setup_elfcorehdr < end) {
>> 469 /*
>> 470 * Reserve from the elf core header to the end of
>> 471 * the memory segment, that should all be kdump
>> 472 * reserved memory.
>> 473 */
>> 474 setup_elfcorehdr_size = end - setup_elfcorehdr;
>> 475 break;
>> 476 }
>> 477 }
>> 478 /*
>> 479 * If we don't find it in the memory map, then we shouldn't
>> 480 * have to worry about it, as the new kernel won't use it.
>> 481 */
>> 482 return 0;
>> 483 }
>> 484 early_param("elfcorehdr", early_parse_elfcorehdr);
>> 485 #endif
>> 486
>> 487 #ifdef CONFIG_KEXEC
>> 488 static void __init mips_parse_crashkernel(void)
>> 489 {
>> 490 unsigned long long total_mem;
>> 491 unsigned long long crash_size, crash_base;
>> 492 int ret;
>> 493
>> 494 total_mem = memblock_phys_mem_size();
>> 495 ret = parse_crashkernel(boot_command_line, total_mem,
>> 496 &crash_size, &crash_base);
>> 497 if (ret != 0 || crash_size <= 0)
>> 498 return;
>> 499
>> 500 if (!memblock_find_in_range(crash_base, crash_base + crash_size, crash_size, 1)) {
>> 501 pr_warn("Invalid memory region reserved for crash kernel\n");
>> 502 return;
>> 503 }
>> 504
>> 505 crashk_res.start = crash_base;
>> 506 crashk_res.end = crash_base + crash_size - 1;
>> 507 }
>> 508
>> 509 static void __init request_crashkernel(struct resource *res)
>> 510 {
>> 511 int ret;
>> 512
>> 513 if (crashk_res.start == crashk_res.end)
>> 514 return;
>> 515
>> 516 ret = request_resource(res, &crashk_res);
>> 517 if (!ret)
>> 518 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
>> 519 (unsigned long)(resource_size(&crashk_res) >> 20),
>> 520 (unsigned long)(crashk_res.start >> 20));
>> 521 }
>> 522 #else /* !defined(CONFIG_KEXEC) */
>> 523 static void __init mips_parse_crashkernel(void)
>> 524 {
>> 525 }
>> 526
>> 527 static void __init request_crashkernel(struct resource *res)
>> 528 {
>> 529 }
>> 530 #endif /* !defined(CONFIG_KEXEC) */
>> 531
>> 532 static void __init check_kernel_sections_mem(void)
>> 533 {
>> 534 phys_addr_t start = PFN_PHYS(PFN_DOWN(__pa_symbol(&_text)));
>> 535 phys_addr_t size = PFN_PHYS(PFN_UP(__pa_symbol(&_end))) - start;
>> 536
>> 537 if (!memblock_is_region_memory(start, size)) {
>> 538 pr_info("Kernel sections are not in the memory maps\n");
>> 539 memblock_add(start, size);
>> 540 }
>> 541 }
>> 542
>> 543 static void __init bootcmdline_append(const char *s, size_t max)
>> 544 {
>> 545 if (!s[0] || !max)
>> 546 return;
>> 547
>> 548 if (boot_command_line[0])
>> 549 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
>> 550
>> 551 strlcat(boot_command_line, s, max);
>> 552 }
>> 553
>> 554 #ifdef CONFIG_OF_EARLY_FLATTREE
>> 555
>> 556 static int __init bootcmdline_scan_chosen(unsigned long node, const char *uname,
>> 557 int depth, void *data)
>> 558 {
>> 559 bool *dt_bootargs = data;
>> 560 const char *p;
>> 561 int l;
>> 562
>> 563 if (depth != 1 || !data ||
>> 564 (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
>> 565 return 0;
>> 566
>> 567 p = of_get_flat_dt_prop(node, "bootargs", &l);
>> 568 if (p != NULL && l > 0) {
>> 569 bootcmdline_append(p, min(l, COMMAND_LINE_SIZE));
>> 570 *dt_bootargs = true;
>> 571 }
>> 572
>> 573 return 1;
>> 574 }
>> 575
>> 576 #endif /* CONFIG_OF_EARLY_FLATTREE */
>> 577
>> 578 static void __init bootcmdline_init(char **cmdline_p)
>> 579 {
>> 580 bool dt_bootargs = false;
>> 581
>> 582 /*
>> 583 * If CMDLINE_OVERRIDE is enabled then initializing the command line is
>> 584 * trivial - we simply use the built-in command line unconditionally &
>> 585 * unmodified.
>> 586 */
>> 587 if (IS_ENABLED(CONFIG_CMDLINE_OVERRIDE)) {
>> 588 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
>> 589 return;
>> 590 }
>> 591
>> 592 /*
>> 593 * If the user specified a built-in command line &
>> 594 * MIPS_CMDLINE_BUILTIN_EXTEND, then the built-in command line is
>> 595 * prepended to arguments from the bootloader or DT so we'll copy them
>> 596 * to the start of boot_command_line here. Otherwise, empty
>> 597 * boot_command_line to undo anything early_init_dt_scan_chosen() did.
>> 598 */
>> 599 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND))
>> 600 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
>> 601 else
>> 602 boot_command_line[0] = 0;
>> 603
>> 604 #ifdef CONFIG_OF_EARLY_FLATTREE
>> 605 /*
>> 606 * If we're configured to take boot arguments from DT, look for those
>> 607 * now.
>> 608 */
>> 609 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB) ||
>> 610 IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND))
>> 611 of_scan_flat_dt(bootcmdline_scan_chosen, &dt_bootargs);
>> 612 #endif
>> 613
>> 614 /*
>> 615 * If we didn't get any arguments from DT (regardless of whether that's
>> 616 * because we weren't configured to look for them, or because we looked
>> 617 * & found none) then we'll take arguments from the bootloader.
>> 618 * plat_mem_setup() should have filled arcs_cmdline with arguments from
>> 619 * the bootloader.
>> 620 */
>> 621 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND) || !dt_bootargs)
>> 622 bootcmdline_append(arcs_cmdline, COMMAND_LINE_SIZE);
>> 623
>> 624 /*
>> 625 * If the user specified a built-in command line & we didn't already
>> 626 * prepend it, we append it to boot_command_line here.
>> 627 */
>> 628 if (IS_ENABLED(CONFIG_CMDLINE_BOOL) &&
>> 629 !IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND))
>> 630 bootcmdline_append(builtin_cmdline, COMMAND_LINE_SIZE);
>> 631 }
>> 632
>> 633 /*
>> 634 * arch_mem_init - initialize memory management subsystem
>> 635 *
>> 636 * o plat_mem_setup() detects the memory configuration and will record detected
>> 637 * memory areas using add_memory_region.
>> 638 *
>> 639 * At this stage the memory configuration of the system is known to the
>> 640 * kernel but generic memory management system is still entirely uninitialized.
>> 641 *
>> 642 * o bootmem_init()
>> 643 * o sparse_init()
>> 644 * o paging_init()
>> 645 * o dma_contiguous_reserve()
>> 646 *
>> 647 * At this stage the bootmem allocator is ready to use.
>> 648 *
>> 649 * NOTE: historically plat_mem_setup did the entire platform initialization.
>> 650 * This was rather impractical because it meant plat_mem_setup had to
>> 651 * get away without any kind of memory allocator. To keep old code from
>> 652 * breaking plat_setup was just renamed to plat_mem_setup and a second platform
>> 653 * initialization hook for anything else was introduced.
>> 654 */
>> 655 static void __init arch_mem_init(char **cmdline_p)
>> 656 {
>> 657 extern void plat_mem_setup(void);
>> 658
>> 659 /* call board setup routine */
>> 660 plat_mem_setup();
>> 661 memblock_set_bottom_up(true);
>> 662
>> 663 bootcmdline_init(cmdline_p);
>> 664 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
>> 665 *cmdline_p = command_line;
>> 666
>> 667 parse_early_param();
>> 668
>> 669 if (usermem)
>> 670 pr_info("User-defined physical RAM map overwrite\n");
>> 671
>> 672 check_kernel_sections_mem();
>> 673
>> 674 early_init_fdt_reserve_self();
>> 675 early_init_fdt_scan_reserved_mem();
>> 676
>> 677 #ifndef CONFIG_NUMA
>> 678 memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0);
>> 679 #endif
>> 680 bootmem_init();
>> 681
>> 682 /*
>> 683 * Prevent memblock from allocating high memory.
>> 684 * This cannot be done before max_low_pfn is detected, so up
>> 685 * to this point is possible to only reserve physical memory
>> 686 * with memblock_reserve; memblock_alloc* can be used
>> 687 * only after this point
>> 688 */
>> 689 memblock_set_current_limit(PFN_PHYS(max_low_pfn));
>> 690
>> 691 #ifdef CONFIG_PROC_VMCORE
>> 692 if (setup_elfcorehdr && setup_elfcorehdr_size) {
>> 693 printk(KERN_INFO "kdump reserved memory at %lx-%lx\n",
>> 694 setup_elfcorehdr, setup_elfcorehdr_size);
>> 695 memblock_reserve(setup_elfcorehdr, setup_elfcorehdr_size);
>> 696 }
>> 697 #endif
>> 698
>> 699 mips_parse_crashkernel();
>> 700 #ifdef CONFIG_KEXEC
>> 701 if (crashk_res.start != crashk_res.end)
>> 702 memblock_reserve(crashk_res.start, resource_size(&crashk_res));
>> 703 #endif
>> 704 device_tree_init();
>> 705
>> 706 /*
>> 707 * In order to reduce the possibility of kernel panic when failed to
>> 708 * get IO TLB memory under CONFIG_SWIOTLB, it is better to allocate
>> 709 * low memory as small as possible before plat_swiotlb_setup(), so
>> 710 * make sparse_init() using top-down allocation.
>> 711 */
>> 712 memblock_set_bottom_up(false);
>> 713 sparse_init();
>> 714 memblock_set_bottom_up(true);
>> 715
>> 716 plat_swiotlb_setup();
>> 717
>> 718 dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
>> 719
>> 720 /* Reserve for hibernation. */
>> 721 memblock_reserve(__pa_symbol(&__nosave_begin),
>> 722 __pa_symbol(&__nosave_end) - __pa_symbol(&__nosave_begin));
>> 723
>> 724 fdt_init_reserved_mem();
>> 725
>> 726 memblock_dump_all();
>> 727
>> 728 early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn));
>> 729 }
>> 730
>> 731 static void __init resource_init(void)
>> 732 {
>> 733 struct memblock_region *region;
>> 734
>> 735 if (UNCAC_BASE != IO_BASE)
>> 736 return;
>> 737
>> 738 code_resource.start = __pa_symbol(&_text);
>> 739 code_resource.end = __pa_symbol(&_etext) - 1;
>> 740 data_resource.start = __pa_symbol(&_etext);
>> 741 data_resource.end = __pa_symbol(&_edata) - 1;
>> 742 bss_resource.start = __pa_symbol(&__bss_start);
>> 743 bss_resource.end = __pa_symbol(&__bss_stop) - 1;
>> 744
>> 745 for_each_memblock(memory, region) {
>> 746 phys_addr_t start = PFN_PHYS(memblock_region_memory_base_pfn(region));
>> 747 phys_addr_t end = PFN_PHYS(memblock_region_memory_end_pfn(region)) - 1;
>> 748 struct resource *res;
>> 749
>> 750 res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES);
>> 751 if (!res)
>> 752 panic("%s: Failed to allocate %zu bytes\n", __func__,
>> 753 sizeof(struct resource));
>> 754
>> 755 res->start = start;
>> 756 res->end = end;
>> 757 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
>> 758 res->name = "System RAM";
>> 759
>> 760 request_resource(&iomem_resource, res);
>> 761
>> 762 /*
>> 763 * We don't know which RAM region contains kernel data,
>> 764 * so we try it repeatedly and let the resource manager
>> 765 * test it.
>> 766 */
>> 767 request_resource(res, &code_resource);
>> 768 request_resource(res, &data_resource);
>> 769 request_resource(res, &bss_resource);
>> 770 request_crashkernel(res);
>> 771 }
>> 772 }
>> 773
>> 774 #ifdef CONFIG_SMP
>> 775 static void __init prefill_possible_map(void)
>> 776 {
>> 777 int i, possible = num_possible_cpus();
>> 778
>> 779 if (possible > nr_cpu_ids)
>> 780 possible = nr_cpu_ids;
>> 781
>> 782 for (i = 0; i < possible; i++)
>> 783 set_cpu_possible(i, true);
>> 784 for (; i < NR_CPUS; i++)
>> 785 set_cpu_possible(i, false);
>> 786
>> 787 nr_cpu_ids = possible;
>> 788 }
4 #else 789 #else
5 #include "setup_no.c" !! 790 static inline void prefill_possible_map(void) {}
>> 791 #endif
>> 792
>> 793 void __init setup_arch(char **cmdline_p)
>> 794 {
>> 795 cpu_probe();
>> 796 mips_cm_probe();
>> 797 prom_init();
>> 798
>> 799 setup_early_fdc_console();
>> 800 #ifdef CONFIG_EARLY_PRINTK
>> 801 setup_early_printk();
>> 802 #endif
>> 803 cpu_report();
>> 804 check_bugs_early();
>> 805
>> 806 #if defined(CONFIG_VT)
>> 807 #if defined(CONFIG_VGA_CONSOLE)
>> 808 conswitchp = &vga_con;
>> 809 #endif
6 #endif 810 #endif
7 811
8 #if IS_ENABLED(CONFIG_INPUT_M68K_BEEP) !! 812 arch_mem_init(cmdline_p);
9 void (*mach_beep)(unsigned int, unsigned int); !! 813 dmi_setup();
10 EXPORT_SYMBOL(mach_beep); !! 814
>> 815 resource_init();
>> 816 plat_smp_setup();
>> 817 prefill_possible_map();
>> 818
>> 819 cpu_cache_init();
>> 820 paging_init();
>> 821 }
>> 822
>> 823 unsigned long kernelsp[NR_CPUS];
>> 824 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
>> 825
>> 826 #ifdef CONFIG_USE_OF
>> 827 unsigned long fw_passed_dtb;
>> 828 #endif
>> 829
>> 830 #ifdef CONFIG_DEBUG_FS
>> 831 struct dentry *mips_debugfs_dir;
>> 832 static int __init debugfs_mips(void)
>> 833 {
>> 834 mips_debugfs_dir = debugfs_create_dir("mips", NULL);
>> 835 return 0;
>> 836 }
>> 837 arch_initcall(debugfs_mips);
>> 838 #endif
>> 839
>> 840 #ifdef CONFIG_DMA_MAYBE_COHERENT
>> 841 /* User defined DMA coherency from command line. */
>> 842 enum coherent_io_user_state coherentio = IO_COHERENCE_DEFAULT;
>> 843 EXPORT_SYMBOL_GPL(coherentio);
>> 844 int hw_coherentio = 0; /* Actual hardware supported DMA coherency setting. */
>> 845
>> 846 static int __init setcoherentio(char *str)
>> 847 {
>> 848 coherentio = IO_COHERENCE_ENABLED;
>> 849 pr_info("Hardware DMA cache coherency (command line)\n");
>> 850 return 0;
>> 851 }
>> 852 early_param("coherentio", setcoherentio);
>> 853
>> 854 static int __init setnocoherentio(char *str)
>> 855 {
>> 856 coherentio = IO_COHERENCE_DISABLED;
>> 857 pr_info("Software DMA cache coherency (command line)\n");
>> 858 return 0;
>> 859 }
>> 860 early_param("nocoherentio", setnocoherentio);
11 #endif 861 #endif
12 862
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