2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
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
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>
32 #include <asm/addrspace.h>
33 #include <asm/bootinfo.h>
35 #include <asm/cache.h>
38 #include <asm/debug.h>
39 #include <asm/dma-coherence.h>
40 #include <asm/sections.h>
41 #include <asm/setup.h>
42 #include <asm/smp-ops.h>
45 #ifdef CONFIG_MIPS_ELF_APPENDED_DTB
46 const char __section(.appended_dtb) __appended_dtb[0x100000];
47 #endif /* CONFIG_MIPS_ELF_APPENDED_DTB */
49 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
51 EXPORT_SYMBOL(cpu_data);
54 struct screen_info screen_info;
60 * These are initialized so they are in the .data section
62 unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
64 EXPORT_SYMBOL(mips_machtype);
66 static char __initdata command_line[COMMAND_LINE_SIZE];
67 char __initdata arcs_cmdline[COMMAND_LINE_SIZE];
69 #ifdef CONFIG_CMDLINE_BOOL
70 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
74 * mips_io_port_base is the begin of the address space to which x86 style
75 * I/O ports are mapped.
77 unsigned long mips_io_port_base = -1;
78 EXPORT_SYMBOL(mips_io_port_base);
80 static struct resource code_resource = { .name = "Kernel code", };
81 static struct resource data_resource = { .name = "Kernel data", };
82 static struct resource bss_resource = { .name = "Kernel bss", };
84 static void *detect_magic __initdata = detect_memory_region;
86 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
87 unsigned long ARCH_PFN_OFFSET;
88 EXPORT_SYMBOL(ARCH_PFN_OFFSET);
91 void __init add_memory_region(phys_addr_t start, phys_addr_t size, long type)
94 * Note: This function only exists for historical reason,
95 * new code should use memblock_add or memblock_add_node instead.
99 * If the region reaches the top of the physical address space, adjust
100 * the size slightly so that (start + size) doesn't overflow
102 if (start + size - 1 == PHYS_ADDR_MAX)
106 if (start + size < start) {
107 pr_warn("Trying to add an invalid memory region, skipped\n");
111 memblock_add(start, size);
112 /* Reserve any memory except the ordinary RAM ranges. */
117 case BOOT_MEM_NOMAP: /* Discard the range from the system. */
118 memblock_remove(start, size);
121 default: /* Reserve the rest of the memory types at boot time */
122 memblock_reserve(start, size);
127 void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max)
129 void *dm = &detect_magic;
132 for (size = sz_min; size < sz_max; size <<= 1) {
133 if (!memcmp(dm, dm + size, sizeof(detect_magic)))
137 pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
138 ((unsigned long long) size) / SZ_1M,
139 (unsigned long long) start,
140 ((unsigned long long) sz_min) / SZ_1M,
141 ((unsigned long long) sz_max) / SZ_1M);
143 add_memory_region(start, size, BOOT_MEM_RAM);
149 #ifdef CONFIG_BLK_DEV_INITRD
151 static int __init rd_start_early(char *p)
153 unsigned long start = memparse(p, &p);
156 /* Guess if the sign extension was forgotten by bootloader */
160 initrd_start = start;
164 early_param("rd_start", rd_start_early);
166 static int __init rd_size_early(char *p)
168 initrd_end += memparse(p, &p);
171 early_param("rd_size", rd_size_early);
173 /* it returns the next free pfn after initrd */
174 static unsigned long __init init_initrd(void)
179 * Board specific code or command line parser should have
180 * already set up initrd_start and initrd_end. In these cases
181 * perfom sanity checks and use them if all looks good.
183 if (!initrd_start || initrd_end <= initrd_start)
186 if (initrd_start & ~PAGE_MASK) {
187 pr_err("initrd start must be page aligned\n");
190 if (initrd_start < PAGE_OFFSET) {
191 pr_err("initrd start < PAGE_OFFSET\n");
196 * Sanitize initrd addresses. For example firmware
197 * can't guess if they need to pass them through
198 * 64-bits values if the kernel has been built in pure
199 * 32-bit. We need also to switch from KSEG0 to XKPHYS
200 * addresses now, so the code can now safely use __pa().
202 end = __pa(initrd_end);
203 initrd_end = (unsigned long)__va(end);
204 initrd_start = (unsigned long)__va(__pa(initrd_start));
206 ROOT_DEV = Root_RAM0;
214 /* In some conditions (e.g. big endian bootloader with a little endian
215 kernel), the initrd might appear byte swapped. Try to detect this and
216 byte swap it if needed. */
217 static void __init maybe_bswap_initrd(void)
219 #if defined(CONFIG_CPU_CAVIUM_OCTEON)
222 /* Check for CPIO signature */
223 if (!memcmp((void *)initrd_start, "070701", 6))
226 /* Check for compressed initrd */
227 if (decompress_method((unsigned char *)initrd_start, 8, NULL))
230 /* Try again with a byte swapped header */
231 buf = swab64p((u64 *)initrd_start);
232 if (!memcmp(&buf, "070701", 6) ||
233 decompress_method((unsigned char *)(&buf), 8, NULL)) {
236 pr_info("Byteswapped initrd detected\n");
237 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8)
243 static void __init finalize_initrd(void)
245 unsigned long size = initrd_end - initrd_start;
248 printk(KERN_INFO "Initrd not found or empty");
251 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
252 printk(KERN_ERR "Initrd extends beyond end of memory");
256 maybe_bswap_initrd();
258 memblock_reserve(__pa(initrd_start), size);
259 initrd_below_start_ok = 1;
261 pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
265 printk(KERN_CONT " - disabling initrd\n");
270 #else /* !CONFIG_BLK_DEV_INITRD */
272 static unsigned long __init init_initrd(void)
277 #define finalize_initrd() do {} while (0)
282 * Initialize the bootmem allocator. It also setup initrd related data
285 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON3) && defined(CONFIG_NUMA))
287 static void __init bootmem_init(void)
293 #else /* !CONFIG_SGI_IP27 */
295 static void __init bootmem_init(void)
297 struct memblock_region *mem;
298 phys_addr_t ramstart, ramend;
300 ramstart = memblock_start_of_DRAM();
301 ramend = memblock_end_of_DRAM();
304 * Sanity check any INITRD first. We don't take it into account
305 * for bootmem setup initially, rely on the end-of-kernel-code
306 * as our memory range starting point. Once bootmem is inited we
307 * will reserve the area used for the initrd.
311 /* Reserve memory occupied by kernel. */
312 memblock_reserve(__pa_symbol(&_text),
313 __pa_symbol(&_end) - __pa_symbol(&_text));
315 /* max_low_pfn is not a number of pages but the end pfn of low mem */
317 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
318 ARCH_PFN_OFFSET = PFN_UP(ramstart);
321 * Reserve any memory between the start of RAM and PHYS_OFFSET
323 if (ramstart > PHYS_OFFSET)
324 memblock_reserve(PHYS_OFFSET, PFN_UP(ramstart) - PHYS_OFFSET);
326 if (PFN_UP(ramstart) > ARCH_PFN_OFFSET) {
327 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
328 (unsigned long)((PFN_UP(ramstart) - ARCH_PFN_OFFSET) * sizeof(struct page)),
329 (unsigned long)(PFN_UP(ramstart) - ARCH_PFN_OFFSET));
333 min_low_pfn = ARCH_PFN_OFFSET;
334 max_pfn = PFN_DOWN(ramend);
335 for_each_memblock(memory, mem) {
336 unsigned long start = memblock_region_memory_base_pfn(mem);
337 unsigned long end = memblock_region_memory_end_pfn(mem);
340 * Skip highmem here so we get an accurate max_low_pfn if low
341 * memory stops short of high memory.
342 * If the region overlaps HIGHMEM_START, end is clipped so
343 * max_pfn excludes the highmem portion.
345 if (memblock_is_nomap(mem))
347 if (start >= PFN_DOWN(HIGHMEM_START))
349 if (end > PFN_DOWN(HIGHMEM_START))
350 end = PFN_DOWN(HIGHMEM_START);
351 if (end > max_low_pfn)
355 if (min_low_pfn >= max_low_pfn)
356 panic("Incorrect memory mapping !!!");
358 if (max_pfn > PFN_DOWN(HIGHMEM_START)) {
359 #ifdef CONFIG_HIGHMEM
360 highstart_pfn = PFN_DOWN(HIGHMEM_START);
361 highend_pfn = max_pfn;
363 max_low_pfn = PFN_DOWN(HIGHMEM_START);
364 max_pfn = max_low_pfn;
370 * In any case the added to the memblock memory regions
371 * (highmem/lowmem, available/reserved, etc) are considered
372 * as present, so inform sparsemem about them.
377 * Reserve initrd memory if needed.
382 #endif /* CONFIG_SGI_IP27 */
384 static int usermem __initdata;
386 static int __init early_parse_mem(char *p)
388 phys_addr_t start, size;
391 * If a user specifies memory size, we
392 * blow away any automatically generated
397 memblock_remove(memblock_start_of_DRAM(),
398 memblock_end_of_DRAM() - memblock_start_of_DRAM());
401 size = memparse(p, &p);
403 start = memparse(p + 1, &p);
405 add_memory_region(start, size, BOOT_MEM_RAM);
409 early_param("mem", early_parse_mem);
411 static int __init early_parse_memmap(char *p)
414 u64 start_at, mem_size;
419 if (!strncmp(p, "exactmap", 8)) {
420 pr_err("\"memmap=exactmap\" invalid on MIPS\n");
425 mem_size = memparse(p, &p);
430 start_at = memparse(p+1, &p);
431 add_memory_region(start_at, mem_size, BOOT_MEM_RAM);
432 } else if (*p == '#') {
433 pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n");
435 } else if (*p == '$') {
436 start_at = memparse(p+1, &p);
437 add_memory_region(start_at, mem_size, BOOT_MEM_RESERVED);
439 pr_err("\"memmap\" invalid format!\n");
449 early_param("memmap", early_parse_memmap);
451 #ifdef CONFIG_PROC_VMCORE
452 unsigned long setup_elfcorehdr, setup_elfcorehdr_size;
453 static int __init early_parse_elfcorehdr(char *p)
455 struct memblock_region *mem;
457 setup_elfcorehdr = memparse(p, &p);
459 for_each_memblock(memory, mem) {
460 unsigned long start = mem->base;
461 unsigned long end = start + mem->size;
462 if (setup_elfcorehdr >= start && setup_elfcorehdr < end) {
464 * Reserve from the elf core header to the end of
465 * the memory segment, that should all be kdump
468 setup_elfcorehdr_size = end - setup_elfcorehdr;
473 * If we don't find it in the memory map, then we shouldn't
474 * have to worry about it, as the new kernel won't use it.
478 early_param("elfcorehdr", early_parse_elfcorehdr);
482 static void __init mips_parse_crashkernel(void)
484 unsigned long long total_mem;
485 unsigned long long crash_size, crash_base;
488 total_mem = memblock_phys_mem_size();
489 ret = parse_crashkernel(boot_command_line, total_mem,
490 &crash_size, &crash_base);
491 if (ret != 0 || crash_size <= 0)
494 if (!memblock_find_in_range(crash_base, crash_base + crash_size, crash_size, 0)) {
495 pr_warn("Invalid memory region reserved for crash kernel\n");
499 crashk_res.start = crash_base;
500 crashk_res.end = crash_base + crash_size - 1;
503 static void __init request_crashkernel(struct resource *res)
507 if (crashk_res.start == crashk_res.end)
510 ret = request_resource(res, &crashk_res);
512 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
513 (unsigned long)((crashk_res.end -
514 crashk_res.start + 1) >> 20),
515 (unsigned long)(crashk_res.start >> 20));
517 #else /* !defined(CONFIG_KEXEC) */
518 static void __init mips_parse_crashkernel(void)
522 static void __init request_crashkernel(struct resource *res)
525 #endif /* !defined(CONFIG_KEXEC) */
527 static void __init check_kernel_sections_mem(void)
529 phys_addr_t start = PFN_PHYS(PFN_DOWN(__pa_symbol(&_text)));
530 phys_addr_t size = PFN_PHYS(PFN_UP(__pa_symbol(&_end))) - start;
532 if (!memblock_is_region_memory(start, size)) {
533 pr_info("Kernel sections are not in the memory maps\n");
534 memblock_add(start, size);
538 #define USE_PROM_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_BOOTLOADER)
539 #define USE_DTB_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB)
540 #define EXTEND_WITH_PROM IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND)
541 #define BUILTIN_EXTEND_WITH_PROM \
542 IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND)
545 * arch_mem_init - initialize memory management subsystem
547 * o plat_mem_setup() detects the memory configuration and will record detected
548 * memory areas using add_memory_region.
550 * At this stage the memory configuration of the system is known to the
551 * kernel but generic memory management system is still entirely uninitialized.
556 * o dma_contiguous_reserve()
558 * At this stage the bootmem allocator is ready to use.
560 * NOTE: historically plat_mem_setup did the entire platform initialization.
561 * This was rather impractical because it meant plat_mem_setup had to
562 * get away without any kind of memory allocator. To keep old code from
563 * breaking plat_setup was just renamed to plat_mem_setup and a second platform
564 * initialization hook for anything else was introduced.
566 static void __init arch_mem_init(char **cmdline_p)
568 extern void plat_mem_setup(void);
571 * Initialize boot_command_line to an innocuous but non-empty string in
572 * order to prevent early_init_dt_scan_chosen() from copying
573 * CONFIG_CMDLINE into it without our knowledge. We handle
574 * CONFIG_CMDLINE ourselves below & don't want to duplicate its
575 * content because repeating arguments can be problematic.
577 strlcpy(boot_command_line, " ", COMMAND_LINE_SIZE);
579 /* call board setup routine */
581 memblock_set_bottom_up(true);
583 #if defined(CONFIG_CMDLINE_BOOL) && defined(CONFIG_CMDLINE_OVERRIDE)
584 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
586 if ((USE_PROM_CMDLINE && arcs_cmdline[0]) ||
587 (USE_DTB_CMDLINE && !boot_command_line[0]))
588 strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
590 if (EXTEND_WITH_PROM && arcs_cmdline[0]) {
591 if (boot_command_line[0])
592 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
593 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
596 #if defined(CONFIG_CMDLINE_BOOL)
597 if (builtin_cmdline[0]) {
598 if (boot_command_line[0])
599 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
600 strlcat(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
603 if (BUILTIN_EXTEND_WITH_PROM && arcs_cmdline[0]) {
604 if (boot_command_line[0])
605 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
606 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
610 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
612 *cmdline_p = command_line;
617 pr_info("User-defined physical RAM map overwrite\n");
619 check_kernel_sections_mem();
621 early_init_fdt_reserve_self();
622 early_init_fdt_scan_reserved_mem();
625 memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0);
630 * Prevent memblock from allocating high memory.
631 * This cannot be done before max_low_pfn is detected, so up
632 * to this point is possible to only reserve physical memory
633 * with memblock_reserve; memblock_alloc* can be used
634 * only after this point
636 memblock_set_current_limit(PFN_PHYS(max_low_pfn));
638 #ifdef CONFIG_PROC_VMCORE
639 if (setup_elfcorehdr && setup_elfcorehdr_size) {
640 printk(KERN_INFO "kdump reserved memory at %lx-%lx\n",
641 setup_elfcorehdr, setup_elfcorehdr_size);
642 memblock_reserve(setup_elfcorehdr, setup_elfcorehdr_size);
646 mips_parse_crashkernel();
648 if (crashk_res.start != crashk_res.end)
649 memblock_reserve(crashk_res.start,
650 crashk_res.end - crashk_res.start + 1);
654 plat_swiotlb_setup();
656 dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
658 /* Reserve for hibernation. */
659 memblock_reserve(__pa_symbol(&__nosave_begin),
660 __pa_symbol(&__nosave_end) - __pa_symbol(&__nosave_begin));
662 fdt_init_reserved_mem();
666 early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn));
669 static void __init resource_init(void)
671 struct memblock_region *region;
673 if (UNCAC_BASE != IO_BASE)
676 code_resource.start = __pa_symbol(&_text);
677 code_resource.end = __pa_symbol(&_etext) - 1;
678 data_resource.start = __pa_symbol(&_etext);
679 data_resource.end = __pa_symbol(&_edata) - 1;
680 bss_resource.start = __pa_symbol(&__bss_start);
681 bss_resource.end = __pa_symbol(&__bss_stop) - 1;
683 for_each_memblock(memory, region) {
684 phys_addr_t start = PFN_PHYS(memblock_region_memory_base_pfn(region));
685 phys_addr_t end = PFN_PHYS(memblock_region_memory_end_pfn(region)) - 1;
686 struct resource *res;
688 res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES);
690 panic("%s: Failed to allocate %zu bytes\n", __func__,
691 sizeof(struct resource));
695 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
696 res->name = "System RAM";
698 request_resource(&iomem_resource, res);
701 * We don't know which RAM region contains kernel data,
702 * so we try it repeatedly and let the resource manager
705 request_resource(res, &code_resource);
706 request_resource(res, &data_resource);
707 request_resource(res, &bss_resource);
708 request_crashkernel(res);
713 static void __init prefill_possible_map(void)
715 int i, possible = num_possible_cpus();
717 if (possible > nr_cpu_ids)
718 possible = nr_cpu_ids;
720 for (i = 0; i < possible; i++)
721 set_cpu_possible(i, true);
722 for (; i < NR_CPUS; i++)
723 set_cpu_possible(i, false);
725 nr_cpu_ids = possible;
728 static inline void prefill_possible_map(void) {}
731 void __init setup_arch(char **cmdline_p)
737 setup_early_fdc_console();
738 #ifdef CONFIG_EARLY_PRINTK
739 setup_early_printk();
744 #if defined(CONFIG_VT)
745 #if defined(CONFIG_VGA_CONSOLE)
746 conswitchp = &vga_con;
747 #elif defined(CONFIG_DUMMY_CONSOLE)
748 conswitchp = &dummy_con;
752 arch_mem_init(cmdline_p);
756 prefill_possible_map();
762 unsigned long kernelsp[NR_CPUS];
763 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
766 unsigned long fw_passed_dtb;
769 #ifdef CONFIG_DEBUG_FS
770 struct dentry *mips_debugfs_dir;
771 static int __init debugfs_mips(void)
773 mips_debugfs_dir = debugfs_create_dir("mips", NULL);
776 arch_initcall(debugfs_mips);
779 #ifdef CONFIG_DMA_MAYBE_COHERENT
780 /* User defined DMA coherency from command line. */
781 enum coherent_io_user_state coherentio = IO_COHERENCE_DEFAULT;
782 EXPORT_SYMBOL_GPL(coherentio);
783 int hw_coherentio = 0; /* Actual hardware supported DMA coherency setting. */
785 static int __init setcoherentio(char *str)
787 coherentio = IO_COHERENCE_ENABLED;
788 pr_info("Hardware DMA cache coherency (command line)\n");
791 early_param("coherentio", setcoherentio);
793 static int __init setnocoherentio(char *str)
795 coherentio = IO_COHERENCE_DISABLED;
796 pr_info("Software DMA cache coherency (command line)\n");
799 early_param("nocoherentio", setnocoherentio);