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>
27 #include <asm/addrspace.h>
28 #include <asm/bootinfo.h>
30 #include <asm/cache.h>
32 #include <asm/sections.h>
33 #include <asm/setup.h>
34 #include <asm/smp-ops.h>
37 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
39 EXPORT_SYMBOL(cpu_data);
42 struct screen_info screen_info;
46 * Despite it's name this variable is even if we don't have PCI
48 unsigned int PCI_DMA_BUS_IS_PHYS;
50 EXPORT_SYMBOL(PCI_DMA_BUS_IS_PHYS);
55 * These are initialized so they are in the .data section
57 unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
59 EXPORT_SYMBOL(mips_machtype);
61 struct boot_mem_map boot_mem_map;
63 static char __initdata command_line[COMMAND_LINE_SIZE];
64 char __initdata arcs_cmdline[COMMAND_LINE_SIZE];
66 #ifdef CONFIG_CMDLINE_BOOL
67 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
71 * mips_io_port_base is the begin of the address space to which x86 style
72 * I/O ports are mapped.
74 const unsigned long mips_io_port_base = -1;
75 EXPORT_SYMBOL(mips_io_port_base);
77 static struct resource code_resource = { .name = "Kernel code", };
78 static struct resource data_resource = { .name = "Kernel data", };
80 void __init add_memory_region(phys_t start, phys_t size, long type)
82 int x = boot_mem_map.nr_map;
86 if (start + size < start) {
87 pr_warning("Trying to add an invalid memory region, skipped\n");
92 * Try to merge with existing entry, if any.
94 for (i = 0; i < boot_mem_map.nr_map; i++) {
95 struct boot_mem_map_entry *entry = boot_mem_map.map + i;
98 if (entry->type != type)
101 if (start + size < entry->addr)
102 continue; /* no overlap */
104 if (entry->addr + entry->size < start)
105 continue; /* no overlap */
107 top = max(entry->addr + entry->size, start + size);
108 entry->addr = min(entry->addr, start);
109 entry->size = top - entry->addr;
114 if (boot_mem_map.nr_map == BOOT_MEM_MAP_MAX) {
115 pr_err("Ooops! Too many entries in the memory map!\n");
119 boot_mem_map.map[x].addr = start;
120 boot_mem_map.map[x].size = size;
121 boot_mem_map.map[x].type = type;
122 boot_mem_map.nr_map++;
125 static void __init print_memory_map(void)
128 const int field = 2 * sizeof(unsigned long);
130 for (i = 0; i < boot_mem_map.nr_map; i++) {
131 printk(KERN_INFO " memory: %0*Lx @ %0*Lx ",
132 field, (unsigned long long) boot_mem_map.map[i].size,
133 field, (unsigned long long) boot_mem_map.map[i].addr);
135 switch (boot_mem_map.map[i].type) {
137 printk(KERN_CONT "(usable)\n");
139 case BOOT_MEM_INIT_RAM:
140 printk(KERN_CONT "(usable after init)\n");
142 case BOOT_MEM_ROM_DATA:
143 printk(KERN_CONT "(ROM data)\n");
145 case BOOT_MEM_RESERVED:
146 printk(KERN_CONT "(reserved)\n");
149 printk(KERN_CONT "type %lu\n", boot_mem_map.map[i].type);
158 #ifdef CONFIG_BLK_DEV_INITRD
160 static int __init rd_start_early(char *p)
162 unsigned long start = memparse(p, &p);
165 /* Guess if the sign extension was forgotten by bootloader */
169 initrd_start = start;
173 early_param("rd_start", rd_start_early);
175 static int __init rd_size_early(char *p)
177 initrd_end += memparse(p, &p);
180 early_param("rd_size", rd_size_early);
182 /* it returns the next free pfn after initrd */
183 static unsigned long __init init_initrd(void)
188 * Board specific code or command line parser should have
189 * already set up initrd_start and initrd_end. In these cases
190 * perfom sanity checks and use them if all looks good.
192 if (!initrd_start || initrd_end <= initrd_start)
195 if (initrd_start & ~PAGE_MASK) {
196 pr_err("initrd start must be page aligned\n");
199 if (initrd_start < PAGE_OFFSET) {
200 pr_err("initrd start < PAGE_OFFSET\n");
205 * Sanitize initrd addresses. For example firmware
206 * can't guess if they need to pass them through
207 * 64-bits values if the kernel has been built in pure
208 * 32-bit. We need also to switch from KSEG0 to XKPHYS
209 * addresses now, so the code can now safely use __pa().
211 end = __pa(initrd_end);
212 initrd_end = (unsigned long)__va(end);
213 initrd_start = (unsigned long)__va(__pa(initrd_start));
215 ROOT_DEV = Root_RAM0;
223 static void __init finalize_initrd(void)
225 unsigned long size = initrd_end - initrd_start;
228 printk(KERN_INFO "Initrd not found or empty");
231 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
232 printk(KERN_ERR "Initrd extends beyond end of memory");
236 reserve_bootmem(__pa(initrd_start), size, BOOTMEM_DEFAULT);
237 initrd_below_start_ok = 1;
239 pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
243 printk(KERN_CONT " - disabling initrd\n");
248 #else /* !CONFIG_BLK_DEV_INITRD */
250 static unsigned long __init init_initrd(void)
255 #define finalize_initrd() do {} while (0)
260 * Initialize the bootmem allocator. It also setup initrd related data
263 #ifdef CONFIG_SGI_IP27
265 static void __init bootmem_init(void)
271 #else /* !CONFIG_SGI_IP27 */
273 static void __init bootmem_init(void)
275 unsigned long reserved_end;
276 unsigned long mapstart = ~0UL;
277 unsigned long bootmap_size;
281 * Init any data related to initrd. It's a nop if INITRD is
282 * not selected. Once that done we can determine the low bound
285 reserved_end = max(init_initrd(),
286 (unsigned long) PFN_UP(__pa_symbol(&_end)));
289 * max_low_pfn is not a number of pages. The number of pages
290 * of the system is given by 'max_low_pfn - min_low_pfn'.
296 * Find the highest page frame number we have available.
298 for (i = 0; i < boot_mem_map.nr_map; i++) {
299 unsigned long start, end;
301 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
304 start = PFN_UP(boot_mem_map.map[i].addr);
305 end = PFN_DOWN(boot_mem_map.map[i].addr
306 + boot_mem_map.map[i].size);
308 if (end > max_low_pfn)
310 if (start < min_low_pfn)
312 if (end <= reserved_end)
314 if (start >= mapstart)
316 mapstart = max(reserved_end, start);
319 if (min_low_pfn >= max_low_pfn)
320 panic("Incorrect memory mapping !!!");
321 if (min_low_pfn > ARCH_PFN_OFFSET) {
322 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
323 (min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page),
324 min_low_pfn - ARCH_PFN_OFFSET);
325 } else if (min_low_pfn < ARCH_PFN_OFFSET) {
326 pr_info("%lu free pages won't be used\n",
327 ARCH_PFN_OFFSET - min_low_pfn);
329 min_low_pfn = ARCH_PFN_OFFSET;
332 * Determine low and high memory ranges
334 max_pfn = max_low_pfn;
335 if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) {
336 #ifdef CONFIG_HIGHMEM
337 highstart_pfn = PFN_DOWN(HIGHMEM_START);
338 highend_pfn = max_low_pfn;
340 max_low_pfn = PFN_DOWN(HIGHMEM_START);
344 * Initialize the boot-time allocator with low memory only.
346 bootmap_size = init_bootmem_node(NODE_DATA(0), mapstart,
347 min_low_pfn, max_low_pfn);
350 for (i = 0; i < boot_mem_map.nr_map; i++) {
351 unsigned long start, end;
353 start = PFN_UP(boot_mem_map.map[i].addr);
354 end = PFN_DOWN(boot_mem_map.map[i].addr
355 + boot_mem_map.map[i].size);
357 if (start <= min_low_pfn)
362 #ifndef CONFIG_HIGHMEM
363 if (end > max_low_pfn)
367 * ... finally, is the area going away?
373 memblock_add_node(PFN_PHYS(start), PFN_PHYS(end - start), 0);
377 * Register fully available low RAM pages with the bootmem allocator.
379 for (i = 0; i < boot_mem_map.nr_map; i++) {
380 unsigned long start, end, size;
382 start = PFN_UP(boot_mem_map.map[i].addr);
383 end = PFN_DOWN(boot_mem_map.map[i].addr
384 + boot_mem_map.map[i].size);
387 * Reserve usable memory.
389 switch (boot_mem_map.map[i].type) {
392 case BOOT_MEM_INIT_RAM:
393 memory_present(0, start, end);
396 /* Not usable memory */
401 * We are rounding up the start address of usable memory
402 * and at the end of the usable range downwards.
404 if (start >= max_low_pfn)
406 if (start < reserved_end)
407 start = reserved_end;
408 if (end > max_low_pfn)
412 * ... finally, is the area going away?
418 /* Register lowmem ranges */
419 free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
420 memory_present(0, start, end);
424 * Reserve the bootmap memory.
426 reserve_bootmem(PFN_PHYS(mapstart), bootmap_size, BOOTMEM_DEFAULT);
429 * Reserve initrd memory if needed.
434 #endif /* CONFIG_SGI_IP27 */
437 * arch_mem_init - initialize memory management subsystem
439 * o plat_mem_setup() detects the memory configuration and will record detected
440 * memory areas using add_memory_region.
442 * At this stage the memory configuration of the system is known to the
443 * kernel but generic memory management system is still entirely uninitialized.
449 * At this stage the bootmem allocator is ready to use.
451 * NOTE: historically plat_mem_setup did the entire platform initialization.
452 * This was rather impractical because it meant plat_mem_setup had to
453 * get away without any kind of memory allocator. To keep old code from
454 * breaking plat_setup was just renamed to plat_setup and a second platform
455 * initialization hook for anything else was introduced.
458 static int usermem __initdata;
460 static int __init early_parse_mem(char *p)
462 unsigned long start, size;
465 * If a user specifies memory size, we
466 * blow away any automatically generated
470 boot_mem_map.nr_map = 0;
474 size = memparse(p, &p);
476 start = memparse(p + 1, &p);
478 add_memory_region(start, size, BOOT_MEM_RAM);
481 early_param("mem", early_parse_mem);
483 #ifdef CONFIG_PROC_VMCORE
484 unsigned long setup_elfcorehdr, setup_elfcorehdr_size;
485 static int __init early_parse_elfcorehdr(char *p)
489 setup_elfcorehdr = memparse(p, &p);
491 for (i = 0; i < boot_mem_map.nr_map; i++) {
492 unsigned long start = boot_mem_map.map[i].addr;
493 unsigned long end = (boot_mem_map.map[i].addr +
494 boot_mem_map.map[i].size);
495 if (setup_elfcorehdr >= start && setup_elfcorehdr < end) {
497 * Reserve from the elf core header to the end of
498 * the memory segment, that should all be kdump
501 setup_elfcorehdr_size = end - setup_elfcorehdr;
506 * If we don't find it in the memory map, then we shouldn't
507 * have to worry about it, as the new kernel won't use it.
511 early_param("elfcorehdr", early_parse_elfcorehdr);
514 static void __init arch_mem_addpart(phys_t mem, phys_t end, int type)
523 /* Make sure it is in the boot_mem_map */
524 for (i = 0; i < boot_mem_map.nr_map; i++) {
525 if (mem >= boot_mem_map.map[i].addr &&
526 mem < (boot_mem_map.map[i].addr +
527 boot_mem_map.map[i].size))
530 add_memory_region(mem, size, type);
533 static void __init arch_mem_init(char **cmdline_p)
535 extern void plat_mem_setup(void);
537 /* call board setup routine */
541 * Make sure all kernel memory is in the maps. The "UP" and
542 * "DOWN" are opposite for initdata since if it crosses over
543 * into another memory section you don't want that to be
544 * freed when the initdata is freed.
546 arch_mem_addpart(PFN_DOWN(__pa_symbol(&_text)) << PAGE_SHIFT,
547 PFN_UP(__pa_symbol(&_edata)) << PAGE_SHIFT,
549 arch_mem_addpart(PFN_UP(__pa_symbol(&__init_begin)) << PAGE_SHIFT,
550 PFN_DOWN(__pa_symbol(&__init_end)) << PAGE_SHIFT,
553 pr_info("Determined physical RAM map:\n");
556 #ifdef CONFIG_CMDLINE_BOOL
557 #ifdef CONFIG_CMDLINE_OVERRIDE
558 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
560 if (builtin_cmdline[0]) {
561 strlcat(arcs_cmdline, " ", COMMAND_LINE_SIZE);
562 strlcat(arcs_cmdline, builtin_cmdline, COMMAND_LINE_SIZE);
564 strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
567 strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
569 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
571 *cmdline_p = command_line;
576 pr_info("User-defined physical RAM map:\n");
581 #ifdef CONFIG_PROC_VMCORE
582 if (setup_elfcorehdr && setup_elfcorehdr_size) {
583 printk(KERN_INFO "kdump reserved memory at %lx-%lx\n",
584 setup_elfcorehdr, setup_elfcorehdr_size);
585 reserve_bootmem(setup_elfcorehdr, setup_elfcorehdr_size,
590 if (crashk_res.start != crashk_res.end)
591 reserve_bootmem(crashk_res.start,
592 crashk_res.end - crashk_res.start + 1,
597 plat_swiotlb_setup();
602 static inline unsigned long long get_total_mem(void)
604 unsigned long long total;
606 total = max_pfn - min_low_pfn;
607 return total << PAGE_SHIFT;
610 static void __init mips_parse_crashkernel(void)
612 unsigned long long total_mem;
613 unsigned long long crash_size, crash_base;
616 total_mem = get_total_mem();
617 ret = parse_crashkernel(boot_command_line, total_mem,
618 &crash_size, &crash_base);
619 if (ret != 0 || crash_size <= 0)
622 crashk_res.start = crash_base;
623 crashk_res.end = crash_base + crash_size - 1;
626 static void __init request_crashkernel(struct resource *res)
630 ret = request_resource(res, &crashk_res);
632 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
633 (unsigned long)((crashk_res.end -
634 crashk_res.start + 1) >> 20),
635 (unsigned long)(crashk_res.start >> 20));
637 #else /* !defined(CONFIG_KEXEC) */
638 static void __init mips_parse_crashkernel(void)
642 static void __init request_crashkernel(struct resource *res)
645 #endif /* !defined(CONFIG_KEXEC) */
647 static void __init resource_init(void)
651 if (UNCAC_BASE != IO_BASE)
654 code_resource.start = __pa_symbol(&_text);
655 code_resource.end = __pa_symbol(&_etext) - 1;
656 data_resource.start = __pa_symbol(&_etext);
657 data_resource.end = __pa_symbol(&_edata) - 1;
660 * Request address space for all standard RAM.
662 mips_parse_crashkernel();
664 for (i = 0; i < boot_mem_map.nr_map; i++) {
665 struct resource *res;
666 unsigned long start, end;
668 start = boot_mem_map.map[i].addr;
669 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
670 if (start >= HIGHMEM_START)
672 if (end >= HIGHMEM_START)
673 end = HIGHMEM_START - 1;
675 res = alloc_bootmem(sizeof(struct resource));
676 switch (boot_mem_map.map[i].type) {
678 case BOOT_MEM_INIT_RAM:
679 case BOOT_MEM_ROM_DATA:
680 res->name = "System RAM";
682 case BOOT_MEM_RESERVED:
684 res->name = "reserved";
690 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
691 request_resource(&iomem_resource, res);
694 * We don't know which RAM region contains kernel data,
695 * so we try it repeatedly and let the resource manager
698 request_resource(res, &code_resource);
699 request_resource(res, &data_resource);
700 request_crashkernel(res);
704 void __init setup_arch(char **cmdline_p)
709 #ifdef CONFIG_EARLY_PRINTK
710 setup_early_printk();
715 #if defined(CONFIG_VT)
716 #if defined(CONFIG_VGA_CONSOLE)
717 conswitchp = &vga_con;
718 #elif defined(CONFIG_DUMMY_CONSOLE)
719 conswitchp = &dummy_con;
723 arch_mem_init(cmdline_p);
731 unsigned long kernelsp[NR_CPUS];
732 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
734 #ifdef CONFIG_DEBUG_FS
735 struct dentry *mips_debugfs_dir;
736 static int __init debugfs_mips(void)
740 d = debugfs_create_dir("mips", NULL);
743 mips_debugfs_dir = d;
746 arch_initcall(debugfs_mips);