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/bootmem.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-contiguous.h>
30 #include <asm/addrspace.h>
31 #include <asm/bootinfo.h>
33 #include <asm/cache.h>
35 #include <asm/sections.h>
36 #include <asm/setup.h>
37 #include <asm/smp-ops.h>
40 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
42 EXPORT_SYMBOL(cpu_data);
45 struct screen_info screen_info;
49 * Despite it's name this variable is even if we don't have PCI
51 unsigned int PCI_DMA_BUS_IS_PHYS;
53 EXPORT_SYMBOL(PCI_DMA_BUS_IS_PHYS);
58 * These are initialized so they are in the .data section
60 unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
62 EXPORT_SYMBOL(mips_machtype);
64 struct boot_mem_map boot_mem_map;
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 const 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", };
83 static void *detect_magic __initdata = detect_memory_region;
85 void __init add_memory_region(phys_t start, phys_t size, long type)
87 int x = boot_mem_map.nr_map;
91 if (start + size < start) {
92 pr_warning("Trying to add an invalid memory region, skipped\n");
97 * Try to merge with existing entry, if any.
99 for (i = 0; i < boot_mem_map.nr_map; i++) {
100 struct boot_mem_map_entry *entry = boot_mem_map.map + i;
103 if (entry->type != type)
106 if (start + size < entry->addr)
107 continue; /* no overlap */
109 if (entry->addr + entry->size < start)
110 continue; /* no overlap */
112 top = max(entry->addr + entry->size, start + size);
113 entry->addr = min(entry->addr, start);
114 entry->size = top - entry->addr;
119 if (boot_mem_map.nr_map == BOOT_MEM_MAP_MAX) {
120 pr_err("Ooops! Too many entries in the memory map!\n");
124 boot_mem_map.map[x].addr = start;
125 boot_mem_map.map[x].size = size;
126 boot_mem_map.map[x].type = type;
127 boot_mem_map.nr_map++;
130 void __init detect_memory_region(phys_t start, phys_t sz_min, phys_t sz_max)
132 void *dm = &detect_magic;
135 for (size = sz_min; size < sz_max; size <<= 1) {
136 if (!memcmp(dm, dm + size, sizeof(detect_magic)))
140 pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
141 ((unsigned long long) size) / SZ_1M,
142 (unsigned long long) start,
143 ((unsigned long long) sz_min) / SZ_1M,
144 ((unsigned long long) sz_max) / SZ_1M);
146 add_memory_region(start, size, BOOT_MEM_RAM);
149 static void __init print_memory_map(void)
152 const int field = 2 * sizeof(unsigned long);
154 for (i = 0; i < boot_mem_map.nr_map; i++) {
155 printk(KERN_INFO " memory: %0*Lx @ %0*Lx ",
156 field, (unsigned long long) boot_mem_map.map[i].size,
157 field, (unsigned long long) boot_mem_map.map[i].addr);
159 switch (boot_mem_map.map[i].type) {
161 printk(KERN_CONT "(usable)\n");
163 case BOOT_MEM_INIT_RAM:
164 printk(KERN_CONT "(usable after init)\n");
166 case BOOT_MEM_ROM_DATA:
167 printk(KERN_CONT "(ROM data)\n");
169 case BOOT_MEM_RESERVED:
170 printk(KERN_CONT "(reserved)\n");
173 printk(KERN_CONT "type %lu\n", boot_mem_map.map[i].type);
182 #ifdef CONFIG_BLK_DEV_INITRD
184 static int __init rd_start_early(char *p)
186 unsigned long start = memparse(p, &p);
189 /* Guess if the sign extension was forgotten by bootloader */
193 initrd_start = start;
197 early_param("rd_start", rd_start_early);
199 static int __init rd_size_early(char *p)
201 initrd_end += memparse(p, &p);
204 early_param("rd_size", rd_size_early);
206 /* it returns the next free pfn after initrd */
207 static unsigned long __init init_initrd(void)
212 * Board specific code or command line parser should have
213 * already set up initrd_start and initrd_end. In these cases
214 * perfom sanity checks and use them if all looks good.
216 if (!initrd_start || initrd_end <= initrd_start)
219 if (initrd_start & ~PAGE_MASK) {
220 pr_err("initrd start must be page aligned\n");
223 if (initrd_start < PAGE_OFFSET) {
224 pr_err("initrd start < PAGE_OFFSET\n");
229 * Sanitize initrd addresses. For example firmware
230 * can't guess if they need to pass them through
231 * 64-bits values if the kernel has been built in pure
232 * 32-bit. We need also to switch from KSEG0 to XKPHYS
233 * addresses now, so the code can now safely use __pa().
235 end = __pa(initrd_end);
236 initrd_end = (unsigned long)__va(end);
237 initrd_start = (unsigned long)__va(__pa(initrd_start));
239 ROOT_DEV = Root_RAM0;
247 static void __init finalize_initrd(void)
249 unsigned long size = initrd_end - initrd_start;
252 printk(KERN_INFO "Initrd not found or empty");
255 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
256 printk(KERN_ERR "Initrd extends beyond end of memory");
260 reserve_bootmem(__pa(initrd_start), size, BOOTMEM_DEFAULT);
261 initrd_below_start_ok = 1;
263 pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
267 printk(KERN_CONT " - disabling initrd\n");
272 #else /* !CONFIG_BLK_DEV_INITRD */
274 static unsigned long __init init_initrd(void)
279 #define finalize_initrd() do {} while (0)
284 * Initialize the bootmem allocator. It also setup initrd related data
287 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON3) && defined(CONFIG_NUMA))
289 static void __init bootmem_init(void)
295 #else /* !CONFIG_SGI_IP27 */
297 static void __init bootmem_init(void)
299 unsigned long reserved_end;
300 unsigned long mapstart = ~0UL;
301 unsigned long bootmap_size;
305 * Sanity check any INITRD first. We don't take it into account
306 * for bootmem setup initially, rely on the end-of-kernel-code
307 * as our memory range starting point. Once bootmem is inited we
308 * will reserve the area used for the initrd.
311 reserved_end = (unsigned long) PFN_UP(__pa_symbol(&_end));
314 * max_low_pfn is not a number of pages. The number of pages
315 * of the system is given by 'max_low_pfn - min_low_pfn'.
321 * Find the highest page frame number we have available.
323 for (i = 0; i < boot_mem_map.nr_map; i++) {
324 unsigned long start, end;
326 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
329 start = PFN_UP(boot_mem_map.map[i].addr);
330 end = PFN_DOWN(boot_mem_map.map[i].addr
331 + boot_mem_map.map[i].size);
333 if (end > max_low_pfn)
335 if (start < min_low_pfn)
337 if (end <= reserved_end)
339 if (start >= mapstart)
341 mapstart = max(reserved_end, start);
344 if (min_low_pfn >= max_low_pfn)
345 panic("Incorrect memory mapping !!!");
346 if (min_low_pfn > ARCH_PFN_OFFSET) {
347 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
348 (min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page),
349 min_low_pfn - ARCH_PFN_OFFSET);
350 } else if (min_low_pfn < ARCH_PFN_OFFSET) {
351 pr_info("%lu free pages won't be used\n",
352 ARCH_PFN_OFFSET - min_low_pfn);
354 min_low_pfn = ARCH_PFN_OFFSET;
357 * Determine low and high memory ranges
359 max_pfn = max_low_pfn;
360 if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) {
361 #ifdef CONFIG_HIGHMEM
362 highstart_pfn = PFN_DOWN(HIGHMEM_START);
363 highend_pfn = max_low_pfn;
365 max_low_pfn = PFN_DOWN(HIGHMEM_START);
368 #ifdef CONFIG_BLK_DEV_INITRD
370 * mapstart should be after initrd_end
373 mapstart = max(mapstart, (unsigned long)PFN_UP(__pa(initrd_end)));
377 * Initialize the boot-time allocator with low memory only.
379 bootmap_size = init_bootmem_node(NODE_DATA(0), mapstart,
380 min_low_pfn, max_low_pfn);
383 for (i = 0; i < boot_mem_map.nr_map; i++) {
384 unsigned long start, end;
386 start = PFN_UP(boot_mem_map.map[i].addr);
387 end = PFN_DOWN(boot_mem_map.map[i].addr
388 + boot_mem_map.map[i].size);
390 if (start <= min_low_pfn)
395 #ifndef CONFIG_HIGHMEM
396 if (end > max_low_pfn)
400 * ... finally, is the area going away?
406 memblock_add_node(PFN_PHYS(start), PFN_PHYS(end - start), 0);
410 * Register fully available low RAM pages with the bootmem allocator.
412 for (i = 0; i < boot_mem_map.nr_map; i++) {
413 unsigned long start, end, size;
415 start = PFN_UP(boot_mem_map.map[i].addr);
416 end = PFN_DOWN(boot_mem_map.map[i].addr
417 + boot_mem_map.map[i].size);
420 * Reserve usable memory.
422 switch (boot_mem_map.map[i].type) {
425 case BOOT_MEM_INIT_RAM:
426 memory_present(0, start, end);
429 /* Not usable memory */
434 * We are rounding up the start address of usable memory
435 * and at the end of the usable range downwards.
437 if (start >= max_low_pfn)
439 if (start < reserved_end)
440 start = reserved_end;
441 if (end > max_low_pfn)
445 * ... finally, is the area going away?
451 /* Register lowmem ranges */
452 free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
453 memory_present(0, start, end);
457 * Reserve the bootmap memory.
459 reserve_bootmem(PFN_PHYS(mapstart), bootmap_size, BOOTMEM_DEFAULT);
462 * Reserve initrd memory if needed.
467 #endif /* CONFIG_SGI_IP27 */
470 * arch_mem_init - initialize memory management subsystem
472 * o plat_mem_setup() detects the memory configuration and will record detected
473 * memory areas using add_memory_region.
475 * At this stage the memory configuration of the system is known to the
476 * kernel but generic memory management system is still entirely uninitialized.
481 * o dma_continguous_reserve()
483 * At this stage the bootmem allocator is ready to use.
485 * NOTE: historically plat_mem_setup did the entire platform initialization.
486 * This was rather impractical because it meant plat_mem_setup had to
487 * get away without any kind of memory allocator. To keep old code from
488 * breaking plat_setup was just renamed to plat_mem_setup and a second platform
489 * initialization hook for anything else was introduced.
492 static int usermem __initdata;
494 static int __init early_parse_mem(char *p)
499 * If a user specifies memory size, we
500 * blow away any automatically generated
504 boot_mem_map.nr_map = 0;
508 size = memparse(p, &p);
510 start = memparse(p + 1, &p);
512 add_memory_region(start, size, BOOT_MEM_RAM);
515 early_param("mem", early_parse_mem);
517 #ifdef CONFIG_PROC_VMCORE
518 unsigned long setup_elfcorehdr, setup_elfcorehdr_size;
519 static int __init early_parse_elfcorehdr(char *p)
523 setup_elfcorehdr = memparse(p, &p);
525 for (i = 0; i < boot_mem_map.nr_map; i++) {
526 unsigned long start = boot_mem_map.map[i].addr;
527 unsigned long end = (boot_mem_map.map[i].addr +
528 boot_mem_map.map[i].size);
529 if (setup_elfcorehdr >= start && setup_elfcorehdr < end) {
531 * Reserve from the elf core header to the end of
532 * the memory segment, that should all be kdump
535 setup_elfcorehdr_size = end - setup_elfcorehdr;
540 * If we don't find it in the memory map, then we shouldn't
541 * have to worry about it, as the new kernel won't use it.
545 early_param("elfcorehdr", early_parse_elfcorehdr);
548 static void __init arch_mem_addpart(phys_t mem, phys_t end, int type)
557 /* Make sure it is in the boot_mem_map */
558 for (i = 0; i < boot_mem_map.nr_map; i++) {
559 if (mem >= boot_mem_map.map[i].addr &&
560 mem < (boot_mem_map.map[i].addr +
561 boot_mem_map.map[i].size))
564 add_memory_region(mem, size, type);
568 static inline unsigned long long get_total_mem(void)
570 unsigned long long total;
572 total = max_pfn - min_low_pfn;
573 return total << PAGE_SHIFT;
576 static void __init mips_parse_crashkernel(void)
578 unsigned long long total_mem;
579 unsigned long long crash_size, crash_base;
582 total_mem = get_total_mem();
583 ret = parse_crashkernel(boot_command_line, total_mem,
584 &crash_size, &crash_base);
585 if (ret != 0 || crash_size <= 0)
588 crashk_res.start = crash_base;
589 crashk_res.end = crash_base + crash_size - 1;
592 static void __init request_crashkernel(struct resource *res)
596 ret = request_resource(res, &crashk_res);
598 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
599 (unsigned long)((crashk_res.end -
600 crashk_res.start + 1) >> 20),
601 (unsigned long)(crashk_res.start >> 20));
603 #else /* !defined(CONFIG_KEXEC) */
604 static void __init mips_parse_crashkernel(void)
608 static void __init request_crashkernel(struct resource *res)
611 #endif /* !defined(CONFIG_KEXEC) */
613 static void __init arch_mem_init(char **cmdline_p)
615 struct memblock_region *reg;
616 extern void plat_mem_setup(void);
618 /* call board setup routine */
622 * Make sure all kernel memory is in the maps. The "UP" and
623 * "DOWN" are opposite for initdata since if it crosses over
624 * into another memory section you don't want that to be
625 * freed when the initdata is freed.
627 arch_mem_addpart(PFN_DOWN(__pa_symbol(&_text)) << PAGE_SHIFT,
628 PFN_UP(__pa_symbol(&_edata)) << PAGE_SHIFT,
630 arch_mem_addpart(PFN_UP(__pa_symbol(&__init_begin)) << PAGE_SHIFT,
631 PFN_DOWN(__pa_symbol(&__init_end)) << PAGE_SHIFT,
634 pr_info("Determined physical RAM map:\n");
637 #ifdef CONFIG_CMDLINE_BOOL
638 #ifdef CONFIG_CMDLINE_OVERRIDE
639 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
641 if (builtin_cmdline[0]) {
642 strlcat(arcs_cmdline, " ", COMMAND_LINE_SIZE);
643 strlcat(arcs_cmdline, builtin_cmdline, COMMAND_LINE_SIZE);
645 strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
648 strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
650 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
652 *cmdline_p = command_line;
657 pr_info("User-defined physical RAM map:\n");
662 #ifdef CONFIG_PROC_VMCORE
663 if (setup_elfcorehdr && setup_elfcorehdr_size) {
664 printk(KERN_INFO "kdump reserved memory at %lx-%lx\n",
665 setup_elfcorehdr, setup_elfcorehdr_size);
666 reserve_bootmem(setup_elfcorehdr, setup_elfcorehdr_size,
671 mips_parse_crashkernel();
673 if (crashk_res.start != crashk_res.end)
674 reserve_bootmem(crashk_res.start,
675 crashk_res.end - crashk_res.start + 1,
680 plat_swiotlb_setup();
683 dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
684 /* Tell bootmem about cma reserved memblock section */
685 for_each_memblock(reserved, reg)
687 reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
690 static void __init resource_init(void)
694 if (UNCAC_BASE != IO_BASE)
697 code_resource.start = __pa_symbol(&_text);
698 code_resource.end = __pa_symbol(&_etext) - 1;
699 data_resource.start = __pa_symbol(&_etext);
700 data_resource.end = __pa_symbol(&_edata) - 1;
702 for (i = 0; i < boot_mem_map.nr_map; i++) {
703 struct resource *res;
704 unsigned long start, end;
706 start = boot_mem_map.map[i].addr;
707 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
708 if (start >= HIGHMEM_START)
710 if (end >= HIGHMEM_START)
711 end = HIGHMEM_START - 1;
713 res = alloc_bootmem(sizeof(struct resource));
714 switch (boot_mem_map.map[i].type) {
716 case BOOT_MEM_INIT_RAM:
717 case BOOT_MEM_ROM_DATA:
718 res->name = "System RAM";
720 case BOOT_MEM_RESERVED:
722 res->name = "reserved";
728 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
729 request_resource(&iomem_resource, res);
732 * We don't know which RAM region contains kernel data,
733 * so we try it repeatedly and let the resource manager
736 request_resource(res, &code_resource);
737 request_resource(res, &data_resource);
738 request_crashkernel(res);
743 static void __init prefill_possible_map(void)
745 int i, possible = num_possible_cpus();
747 if (possible > nr_cpu_ids)
748 possible = nr_cpu_ids;
750 for (i = 0; i < possible; i++)
751 set_cpu_possible(i, true);
752 for (; i < NR_CPUS; i++)
753 set_cpu_possible(i, false);
755 nr_cpu_ids = possible;
758 static inline void prefill_possible_map(void) {}
761 void __init setup_arch(char **cmdline_p)
766 #ifdef CONFIG_EARLY_PRINTK
767 setup_early_printk();
772 #if defined(CONFIG_VT)
773 #if defined(CONFIG_VGA_CONSOLE)
774 conswitchp = &vga_con;
775 #elif defined(CONFIG_DUMMY_CONSOLE)
776 conswitchp = &dummy_con;
780 arch_mem_init(cmdline_p);
784 prefill_possible_map();
789 unsigned long kernelsp[NR_CPUS];
790 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
792 #ifdef CONFIG_DEBUG_FS
793 struct dentry *mips_debugfs_dir;
794 static int __init debugfs_mips(void)
798 d = debugfs_create_dir("mips", NULL);
801 mips_debugfs_dir = d;
804 arch_initcall(debugfs_mips);