Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/arm/mm/init.c |
| 3 | * |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 4 | * Copyright (C) 1995-2005 Russell King |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 as |
| 8 | * published by the Free Software Foundation. |
| 9 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | #include <linux/kernel.h> |
| 11 | #include <linux/errno.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include <linux/swap.h> |
| 13 | #include <linux/init.h> |
| 14 | #include <linux/bootmem.h> |
| 15 | #include <linux/mman.h> |
| 16 | #include <linux/nodemask.h> |
| 17 | #include <linux/initrd.h> |
Nicolas Pitre | 3835f6c | 2008-09-17 15:21:55 -0400 | [diff] [blame] | 18 | #include <linux/highmem.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 19 | #include <linux/gfp.h> |
Russell King | 2778f62 | 2010-07-09 16:27:52 +0100 | [diff] [blame] | 20 | #include <linux/memblock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | |
| 22 | #include <asm/mach-types.h> |
Russell King | 37efe64 | 2008-12-01 11:53:07 +0000 | [diff] [blame] | 23 | #include <asm/sections.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <asm/setup.h> |
Russell King | 74d02fb | 2006-04-04 21:47:43 +0100 | [diff] [blame] | 25 | #include <asm/sizes.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <asm/tlb.h> |
Fenkart/Bostandzhyan | db9ef1a | 2010-02-07 21:45:47 +0100 | [diff] [blame] | 27 | #include <asm/fixmap.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | |
| 29 | #include <asm/mach/arch.h> |
| 30 | #include <asm/mach/map.h> |
| 31 | |
Russell King | 1b2e2b7 | 2006-08-21 17:06:38 +0100 | [diff] [blame] | 32 | #include "mm.h" |
| 33 | |
Russell King | 012d1f4 | 2008-09-06 10:57:03 +0100 | [diff] [blame] | 34 | static unsigned long phys_initrd_start __initdata = 0; |
| 35 | static unsigned long phys_initrd_size __initdata = 0; |
| 36 | |
Jeremy Kerr | 2b0d8c2 | 2010-01-11 23:17:34 +0100 | [diff] [blame] | 37 | static int __init early_initrd(char *p) |
Russell King | 012d1f4 | 2008-09-06 10:57:03 +0100 | [diff] [blame] | 38 | { |
| 39 | unsigned long start, size; |
Jeremy Kerr | 2b0d8c2 | 2010-01-11 23:17:34 +0100 | [diff] [blame] | 40 | char *endp; |
Russell King | 012d1f4 | 2008-09-06 10:57:03 +0100 | [diff] [blame] | 41 | |
Jeremy Kerr | 2b0d8c2 | 2010-01-11 23:17:34 +0100 | [diff] [blame] | 42 | start = memparse(p, &endp); |
| 43 | if (*endp == ',') { |
| 44 | size = memparse(endp + 1, NULL); |
Russell King | 012d1f4 | 2008-09-06 10:57:03 +0100 | [diff] [blame] | 45 | |
| 46 | phys_initrd_start = start; |
| 47 | phys_initrd_size = size; |
| 48 | } |
Jeremy Kerr | 2b0d8c2 | 2010-01-11 23:17:34 +0100 | [diff] [blame] | 49 | return 0; |
Russell King | 012d1f4 | 2008-09-06 10:57:03 +0100 | [diff] [blame] | 50 | } |
Jeremy Kerr | 2b0d8c2 | 2010-01-11 23:17:34 +0100 | [diff] [blame] | 51 | early_param("initrd", early_initrd); |
Russell King | 012d1f4 | 2008-09-06 10:57:03 +0100 | [diff] [blame] | 52 | |
| 53 | static int __init parse_tag_initrd(const struct tag *tag) |
| 54 | { |
| 55 | printk(KERN_WARNING "ATAG_INITRD is deprecated; " |
| 56 | "please update your bootloader.\n"); |
| 57 | phys_initrd_start = __virt_to_phys(tag->u.initrd.start); |
| 58 | phys_initrd_size = tag->u.initrd.size; |
| 59 | return 0; |
| 60 | } |
| 61 | |
| 62 | __tagtable(ATAG_INITRD, parse_tag_initrd); |
| 63 | |
| 64 | static int __init parse_tag_initrd2(const struct tag *tag) |
| 65 | { |
| 66 | phys_initrd_start = tag->u.initrd.start; |
| 67 | phys_initrd_size = tag->u.initrd.size; |
| 68 | return 0; |
| 69 | } |
| 70 | |
| 71 | __tagtable(ATAG_INITRD2, parse_tag_initrd2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | |
| 73 | /* |
Nicolas Pitre | 4b5f32c | 2008-10-06 13:24:40 -0400 | [diff] [blame] | 74 | * This keeps memory configuration data used by a couple memory |
| 75 | * initialization functions, as well as show_mem() for the skipping |
| 76 | * of holes in the memory map. It is populated by arm_add_memory(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | */ |
Nicolas Pitre | 4b5f32c | 2008-10-06 13:24:40 -0400 | [diff] [blame] | 78 | struct meminfo meminfo; |
Ray Lehtiniemi | 5e70982 | 2006-11-07 03:19:15 +0100 | [diff] [blame] | 79 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | void show_mem(void) |
| 81 | { |
| 82 | int free = 0, total = 0, reserved = 0; |
Russell King | be37030 | 2010-05-07 17:40:33 +0100 | [diff] [blame] | 83 | int shared = 0, cached = 0, slab = 0, i; |
Ray Lehtiniemi | 5e70982 | 2006-11-07 03:19:15 +0100 | [diff] [blame] | 84 | struct meminfo * mi = &meminfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | |
| 86 | printk("Mem-info:\n"); |
| 87 | show_free_areas(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | |
Russell King | be37030 | 2010-05-07 17:40:33 +0100 | [diff] [blame] | 89 | for_each_bank (i, mi) { |
| 90 | struct membank *bank = &mi->bank[i]; |
| 91 | unsigned int pfn1, pfn2; |
| 92 | struct page *page, *end; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | |
Russell King | be37030 | 2010-05-07 17:40:33 +0100 | [diff] [blame] | 94 | pfn1 = bank_pfn_start(bank); |
| 95 | pfn2 = bank_pfn_end(bank); |
Ray Lehtiniemi | 5e70982 | 2006-11-07 03:19:15 +0100 | [diff] [blame] | 96 | |
Russell King | be37030 | 2010-05-07 17:40:33 +0100 | [diff] [blame] | 97 | page = pfn_to_page(pfn1); |
| 98 | end = pfn_to_page(pfn2 - 1) + 1; |
| 99 | |
| 100 | do { |
| 101 | total++; |
| 102 | if (PageReserved(page)) |
| 103 | reserved++; |
| 104 | else if (PageSwapCache(page)) |
| 105 | cached++; |
| 106 | else if (PageSlab(page)) |
| 107 | slab++; |
| 108 | else if (!page_count(page)) |
| 109 | free++; |
| 110 | else |
| 111 | shared += page_count(page) - 1; |
| 112 | page++; |
| 113 | } while (page < end); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | } |
| 115 | |
| 116 | printk("%d pages of RAM\n", total); |
| 117 | printk("%d free pages\n", free); |
| 118 | printk("%d reserved pages\n", reserved); |
| 119 | printk("%d slab pages\n", slab); |
| 120 | printk("%d pages shared\n", shared); |
| 121 | printk("%d pages swap cached\n", cached); |
| 122 | } |
| 123 | |
Russell King | be37030 | 2010-05-07 17:40:33 +0100 | [diff] [blame] | 124 | static void __init find_limits(struct meminfo *mi, |
Russell King | dde5828 | 2009-08-15 12:36:00 +0100 | [diff] [blame] | 125 | unsigned long *min, unsigned long *max_low, unsigned long *max_high) |
| 126 | { |
| 127 | int i; |
| 128 | |
| 129 | *min = -1UL; |
| 130 | *max_low = *max_high = 0; |
| 131 | |
Russell King | be37030 | 2010-05-07 17:40:33 +0100 | [diff] [blame] | 132 | for_each_bank (i, mi) { |
Russell King | dde5828 | 2009-08-15 12:36:00 +0100 | [diff] [blame] | 133 | struct membank *bank = &mi->bank[i]; |
| 134 | unsigned long start, end; |
| 135 | |
| 136 | start = bank_pfn_start(bank); |
| 137 | end = bank_pfn_end(bank); |
| 138 | |
| 139 | if (*min > start) |
| 140 | *min = start; |
| 141 | if (*max_high < end) |
| 142 | *max_high = end; |
| 143 | if (bank->highmem) |
| 144 | continue; |
| 145 | if (*max_low < end) |
| 146 | *max_low = end; |
| 147 | } |
| 148 | } |
| 149 | |
Russell King | be37030 | 2010-05-07 17:40:33 +0100 | [diff] [blame] | 150 | static void __init arm_bootmem_init(struct meminfo *mi, |
Russell King | dde5828 | 2009-08-15 12:36:00 +0100 | [diff] [blame] | 151 | unsigned long start_pfn, unsigned long end_pfn) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | { |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 153 | unsigned int boot_pages; |
Russell King | 2778f62 | 2010-07-09 16:27:52 +0100 | [diff] [blame] | 154 | phys_addr_t bitmap; |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 155 | pg_data_t *pgdat; |
| 156 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | /* |
Russell King | 2778f62 | 2010-07-09 16:27:52 +0100 | [diff] [blame] | 159 | * Allocate the bootmem bitmap page. This must be in a region |
| 160 | * of memory which has already been mapped. |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 161 | */ |
| 162 | boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn); |
Russell King | 2778f62 | 2010-07-09 16:27:52 +0100 | [diff] [blame] | 163 | bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES, |
| 164 | __pfn_to_phys(end_pfn)); |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 165 | |
| 166 | /* |
Russell King | be37030 | 2010-05-07 17:40:33 +0100 | [diff] [blame] | 167 | * Initialise the bootmem allocator, handing the |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 168 | * memory banks over to bootmem. |
| 169 | */ |
Russell King | be37030 | 2010-05-07 17:40:33 +0100 | [diff] [blame] | 170 | node_set_online(0); |
| 171 | pgdat = NODE_DATA(0); |
Russell King | 2778f62 | 2010-07-09 16:27:52 +0100 | [diff] [blame] | 172 | init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn); |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 173 | |
Russell King | be37030 | 2010-05-07 17:40:33 +0100 | [diff] [blame] | 174 | for_each_bank(i, mi) { |
Russell King | d2a38ef | 2008-10-01 16:56:15 +0100 | [diff] [blame] | 175 | struct membank *bank = &mi->bank[i]; |
Russell King | dde5828 | 2009-08-15 12:36:00 +0100 | [diff] [blame] | 176 | if (!bank->highmem) |
Russell King | be37030 | 2010-05-07 17:40:33 +0100 | [diff] [blame] | 177 | free_bootmem(bank_phys_start(bank), bank_phys_size(bank)); |
Russell King | d2a38ef | 2008-10-01 16:56:15 +0100 | [diff] [blame] | 178 | } |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 179 | |
| 180 | /* |
Russell King | 2778f62 | 2010-07-09 16:27:52 +0100 | [diff] [blame] | 181 | * Reserve the memblock reserved regions in bootmem. |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 182 | */ |
Russell King | 2778f62 | 2010-07-09 16:27:52 +0100 | [diff] [blame] | 183 | for (i = 0; i < memblock.reserved.cnt; i++) { |
| 184 | phys_addr_t start = memblock_start_pfn(&memblock.reserved, i); |
| 185 | if (start >= start_pfn && |
| 186 | memblock_end_pfn(&memblock.reserved, i) <= end_pfn) |
| 187 | reserve_bootmem_node(pgdat, __pfn_to_phys(start), |
| 188 | memblock_size_bytes(&memblock.reserved, i), |
| 189 | BOOTMEM_DEFAULT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | } |
Russell King | b7a69ac | 2008-10-01 16:58:32 +0100 | [diff] [blame] | 191 | } |
| 192 | |
Russell King | a9deb13 | 2010-07-01 18:35:07 +0100 | [diff] [blame] | 193 | static void __init arm_bootmem_free(struct meminfo *mi, unsigned long min, |
| 194 | unsigned long max_low, unsigned long max_high) |
Russell King | b7a69ac | 2008-10-01 16:58:32 +0100 | [diff] [blame] | 195 | { |
| 196 | unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; |
Russell King | b7a69ac | 2008-10-01 16:58:32 +0100 | [diff] [blame] | 197 | int i; |
| 198 | |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 199 | /* |
Russell King | be37030 | 2010-05-07 17:40:33 +0100 | [diff] [blame] | 200 | * initialise the zones. |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 201 | */ |
| 202 | memset(zone_size, 0, sizeof(zone_size)); |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 203 | |
| 204 | /* |
Russell King | be37030 | 2010-05-07 17:40:33 +0100 | [diff] [blame] | 205 | * The memory size has already been determined. If we need |
| 206 | * to do anything fancy with the allocation of this memory |
| 207 | * to the zones, now is the time to do it. |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 208 | */ |
Russell King | dde5828 | 2009-08-15 12:36:00 +0100 | [diff] [blame] | 209 | zone_size[0] = max_low - min; |
| 210 | #ifdef CONFIG_HIGHMEM |
| 211 | zone_size[ZONE_HIGHMEM] = max_high - max_low; |
| 212 | #endif |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 213 | |
| 214 | /* |
Russell King | be37030 | 2010-05-07 17:40:33 +0100 | [diff] [blame] | 215 | * Calculate the size of the holes. |
| 216 | * holes = node_size - sum(bank_sizes) |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 217 | */ |
Russell King | dde5828 | 2009-08-15 12:36:00 +0100 | [diff] [blame] | 218 | memcpy(zhole_size, zone_size, sizeof(zhole_size)); |
Russell King | be37030 | 2010-05-07 17:40:33 +0100 | [diff] [blame] | 219 | for_each_bank(i, mi) { |
Russell King | dde5828 | 2009-08-15 12:36:00 +0100 | [diff] [blame] | 220 | int idx = 0; |
| 221 | #ifdef CONFIG_HIGHMEM |
| 222 | if (mi->bank[i].highmem) |
| 223 | idx = ZONE_HIGHMEM; |
| 224 | #endif |
| 225 | zhole_size[idx] -= bank_pfn_size(&mi->bank[i]); |
| 226 | } |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 227 | |
| 228 | /* |
| 229 | * Adjust the sizes according to any special requirements for |
| 230 | * this machine type. |
| 231 | */ |
Russell King | b65b478 | 2010-05-22 20:58:51 +0100 | [diff] [blame] | 232 | arch_adjust_zones(zone_size, zhole_size); |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 233 | |
Russell King | be37030 | 2010-05-07 17:40:33 +0100 | [diff] [blame] | 234 | free_area_init_node(0, zone_size, min, zhole_size); |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 235 | } |
| 236 | |
Russell King | b7cfda9 | 2009-09-07 15:06:42 +0100 | [diff] [blame] | 237 | #ifndef CONFIG_SPARSEMEM |
| 238 | int pfn_valid(unsigned long pfn) |
| 239 | { |
Russell King | e07b9e08 | 2010-07-01 12:03:29 +0100 | [diff] [blame] | 240 | struct memblock_region *mem = &memblock.memory; |
| 241 | unsigned int left = 0, right = mem->cnt; |
Russell King | b7cfda9 | 2009-09-07 15:06:42 +0100 | [diff] [blame] | 242 | |
| 243 | do { |
| 244 | unsigned int mid = (right + left) / 2; |
Russell King | b7cfda9 | 2009-09-07 15:06:42 +0100 | [diff] [blame] | 245 | |
Russell King | e07b9e08 | 2010-07-01 12:03:29 +0100 | [diff] [blame] | 246 | if (pfn < memblock_start_pfn(mem, mid)) |
Russell King | b7cfda9 | 2009-09-07 15:06:42 +0100 | [diff] [blame] | 247 | right = mid; |
Russell King | e07b9e08 | 2010-07-01 12:03:29 +0100 | [diff] [blame] | 248 | else if (pfn >= memblock_end_pfn(mem, mid)) |
Russell King | b7cfda9 | 2009-09-07 15:06:42 +0100 | [diff] [blame] | 249 | left = mid + 1; |
| 250 | else |
| 251 | return 1; |
| 252 | } while (left < right); |
| 253 | return 0; |
| 254 | } |
| 255 | EXPORT_SYMBOL(pfn_valid); |
Russell King | 657e12f | 2009-10-29 17:06:17 +0000 | [diff] [blame] | 256 | |
Russell King | eda2e5d | 2010-07-01 12:00:57 +0100 | [diff] [blame] | 257 | static void arm_memory_present(void) |
Russell King | 657e12f | 2009-10-29 17:06:17 +0000 | [diff] [blame] | 258 | { |
| 259 | } |
| 260 | #else |
Russell King | eda2e5d | 2010-07-01 12:00:57 +0100 | [diff] [blame] | 261 | static void arm_memory_present(void) |
Russell King | 657e12f | 2009-10-29 17:06:17 +0000 | [diff] [blame] | 262 | { |
| 263 | int i; |
Russell King | eda2e5d | 2010-07-01 12:00:57 +0100 | [diff] [blame] | 264 | for (i = 0; i < memblock.memory.cnt; i++) |
| 265 | memory_present(0, memblock_start_pfn(&memblock.memory, i), |
| 266 | memblock_end_pfn(&memblock.memory, i)); |
Russell King | 657e12f | 2009-10-29 17:06:17 +0000 | [diff] [blame] | 267 | } |
Russell King | b7cfda9 | 2009-09-07 15:06:42 +0100 | [diff] [blame] | 268 | #endif |
| 269 | |
Russell King | 8d717a5 | 2010-05-22 19:47:18 +0100 | [diff] [blame] | 270 | void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc) |
Russell King | 2778f62 | 2010-07-09 16:27:52 +0100 | [diff] [blame] | 271 | { |
| 272 | int i; |
| 273 | |
| 274 | memblock_init(); |
| 275 | for (i = 0; i < mi->nr_banks; i++) |
| 276 | memblock_add(mi->bank[i].start, mi->bank[i].size); |
| 277 | |
| 278 | /* Register the kernel text, kernel data and initrd with memblock. */ |
| 279 | #ifdef CONFIG_XIP_KERNEL |
Russell King | 842eab4 | 2010-10-01 14:12:22 +0100 | [diff] [blame^] | 280 | memblock_reserve(__pa(_sdata), _end - _sdata); |
Russell King | 2778f62 | 2010-07-09 16:27:52 +0100 | [diff] [blame] | 281 | #else |
| 282 | memblock_reserve(__pa(_stext), _end - _stext); |
| 283 | #endif |
| 284 | #ifdef CONFIG_BLK_DEV_INITRD |
| 285 | if (phys_initrd_size) { |
| 286 | memblock_reserve(phys_initrd_start, phys_initrd_size); |
| 287 | |
| 288 | /* Now convert initrd to virtual addresses */ |
| 289 | initrd_start = __phys_to_virt(phys_initrd_start); |
| 290 | initrd_end = initrd_start + phys_initrd_size; |
| 291 | } |
| 292 | #endif |
| 293 | |
| 294 | arm_mm_memblock_reserve(); |
| 295 | |
Russell King | 8d717a5 | 2010-05-22 19:47:18 +0100 | [diff] [blame] | 296 | /* reserve any platform specific memblock areas */ |
| 297 | if (mdesc->reserve) |
| 298 | mdesc->reserve(); |
| 299 | |
Russell King | 2778f62 | 2010-07-09 16:27:52 +0100 | [diff] [blame] | 300 | memblock_analyze(); |
| 301 | memblock_dump_all(); |
| 302 | } |
| 303 | |
Russell King | 8d717a5 | 2010-05-22 19:47:18 +0100 | [diff] [blame] | 304 | void __init bootmem_init(void) |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 305 | { |
Nicolas Pitre | 4b5f32c | 2008-10-06 13:24:40 -0400 | [diff] [blame] | 306 | struct meminfo *mi = &meminfo; |
Russell King | dde5828 | 2009-08-15 12:36:00 +0100 | [diff] [blame] | 307 | unsigned long min, max_low, max_high; |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 308 | |
Russell King | dde5828 | 2009-08-15 12:36:00 +0100 | [diff] [blame] | 309 | max_low = max_high = 0; |
| 310 | |
Russell King | be37030 | 2010-05-07 17:40:33 +0100 | [diff] [blame] | 311 | find_limits(mi, &min, &max_low, &max_high); |
| 312 | |
| 313 | arm_bootmem_init(mi, min, max_low); |
| 314 | |
Russell King | be37030 | 2010-05-07 17:40:33 +0100 | [diff] [blame] | 315 | /* |
Russell King | be37030 | 2010-05-07 17:40:33 +0100 | [diff] [blame] | 316 | * Sparsemem tries to allocate bootmem in memory_present(), |
| 317 | * so must be done after the fixed reservations |
| 318 | */ |
Russell King | eda2e5d | 2010-07-01 12:00:57 +0100 | [diff] [blame] | 319 | arm_memory_present(); |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 320 | |
Russell King | b7a69ac | 2008-10-01 16:58:32 +0100 | [diff] [blame] | 321 | /* |
| 322 | * sparse_init() needs the bootmem allocator up and running. |
| 323 | */ |
| 324 | sparse_init(); |
| 325 | |
| 326 | /* |
Russell King | be37030 | 2010-05-07 17:40:33 +0100 | [diff] [blame] | 327 | * Now free the memory - free_area_init_node needs |
Russell King | b7a69ac | 2008-10-01 16:58:32 +0100 | [diff] [blame] | 328 | * the sparse mem_map arrays initialized by sparse_init() |
| 329 | * for memmap_init_zone(), otherwise all PFNs are invalid. |
| 330 | */ |
Russell King | a9deb13 | 2010-07-01 18:35:07 +0100 | [diff] [blame] | 331 | arm_bootmem_free(mi, min, max_low, max_high); |
Russell King | b7a69ac | 2008-10-01 16:58:32 +0100 | [diff] [blame] | 332 | |
Russell King | dde5828 | 2009-08-15 12:36:00 +0100 | [diff] [blame] | 333 | high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1; |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 334 | |
| 335 | /* |
| 336 | * This doesn't seem to be used by the Linux memory manager any |
| 337 | * more, but is used by ll_rw_block. If we can get rid of it, we |
| 338 | * also get rid of some of the stuff above as well. |
| 339 | * |
| 340 | * Note: max_low_pfn and max_pfn reflect the number of _pages_ in |
| 341 | * the system, not the maximum PFN. |
| 342 | */ |
Russell King | dde5828 | 2009-08-15 12:36:00 +0100 | [diff] [blame] | 343 | max_low_pfn = max_low - PHYS_PFN_OFFSET; |
| 344 | max_pfn = max_high - PHYS_PFN_OFFSET; |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 345 | } |
| 346 | |
Nicolas Pitre | 6db015e | 2008-09-17 14:50:42 -0400 | [diff] [blame] | 347 | static inline int free_area(unsigned long pfn, unsigned long end, char *s) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | { |
Nicolas Pitre | 6db015e | 2008-09-17 14:50:42 -0400 | [diff] [blame] | 349 | unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | |
Nicolas Pitre | 6db015e | 2008-09-17 14:50:42 -0400 | [diff] [blame] | 351 | for (; pfn < end; pfn++) { |
| 352 | struct page *page = pfn_to_page(pfn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | ClearPageReserved(page); |
Nick Piggin | 7835e98 | 2006-03-22 00:08:40 -0800 | [diff] [blame] | 354 | init_page_count(page); |
Nicolas Pitre | 6db015e | 2008-09-17 14:50:42 -0400 | [diff] [blame] | 355 | __free_page(page); |
| 356 | pages++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | } |
| 358 | |
| 359 | if (size && s) |
| 360 | printk(KERN_INFO "Freeing %s memory: %dK\n", s, size); |
Nicolas Pitre | 6db015e | 2008-09-17 14:50:42 -0400 | [diff] [blame] | 361 | |
| 362 | return pages; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | } |
| 364 | |
Russell King | a013053 | 2005-06-27 14:16:47 +0100 | [diff] [blame] | 365 | static inline void |
Russell King | be37030 | 2010-05-07 17:40:33 +0100 | [diff] [blame] | 366 | free_memmap(unsigned long start_pfn, unsigned long end_pfn) |
Russell King | a013053 | 2005-06-27 14:16:47 +0100 | [diff] [blame] | 367 | { |
| 368 | struct page *start_pg, *end_pg; |
| 369 | unsigned long pg, pgend; |
| 370 | |
| 371 | /* |
| 372 | * Convert start_pfn/end_pfn to a struct page pointer. |
| 373 | */ |
Catalin Marinas | 3257f43 | 2009-10-06 17:57:22 +0100 | [diff] [blame] | 374 | start_pg = pfn_to_page(start_pfn - 1) + 1; |
Russell King | a013053 | 2005-06-27 14:16:47 +0100 | [diff] [blame] | 375 | end_pg = pfn_to_page(end_pfn); |
| 376 | |
| 377 | /* |
| 378 | * Convert to physical addresses, and |
| 379 | * round start upwards and end downwards. |
| 380 | */ |
| 381 | pg = PAGE_ALIGN(__pa(start_pg)); |
| 382 | pgend = __pa(end_pg) & PAGE_MASK; |
| 383 | |
| 384 | /* |
| 385 | * If there are free pages between these, |
| 386 | * free the section of the memmap array. |
| 387 | */ |
| 388 | if (pg < pgend) |
Russell King | be37030 | 2010-05-07 17:40:33 +0100 | [diff] [blame] | 389 | free_bootmem(pg, pgend - pg); |
Russell King | a013053 | 2005-06-27 14:16:47 +0100 | [diff] [blame] | 390 | } |
| 391 | |
| 392 | /* |
| 393 | * The mem_map array can get very big. Free the unused area of the memory map. |
| 394 | */ |
Russell King | be37030 | 2010-05-07 17:40:33 +0100 | [diff] [blame] | 395 | static void __init free_unused_memmap(struct meminfo *mi) |
Russell King | a013053 | 2005-06-27 14:16:47 +0100 | [diff] [blame] | 396 | { |
| 397 | unsigned long bank_start, prev_bank_end = 0; |
| 398 | unsigned int i; |
| 399 | |
| 400 | /* |
Michael Bohan | 3260e52 | 2010-06-14 13:06:56 -0700 | [diff] [blame] | 401 | * This relies on each bank being in address order. |
| 402 | * The banks are sorted previously in bootmem_init(). |
Russell King | a013053 | 2005-06-27 14:16:47 +0100 | [diff] [blame] | 403 | */ |
Russell King | be37030 | 2010-05-07 17:40:33 +0100 | [diff] [blame] | 404 | for_each_bank(i, mi) { |
Russell King | d2a38ef | 2008-10-01 16:56:15 +0100 | [diff] [blame] | 405 | struct membank *bank = &mi->bank[i]; |
| 406 | |
| 407 | bank_start = bank_pfn_start(bank); |
Russell King | a013053 | 2005-06-27 14:16:47 +0100 | [diff] [blame] | 408 | |
| 409 | /* |
| 410 | * If we had a previous bank, and there is a space |
| 411 | * between the current bank and the previous, free it. |
| 412 | */ |
Michael Bohan | 3260e52 | 2010-06-14 13:06:56 -0700 | [diff] [blame] | 413 | if (prev_bank_end && prev_bank_end < bank_start) |
Russell King | be37030 | 2010-05-07 17:40:33 +0100 | [diff] [blame] | 414 | free_memmap(prev_bank_end, bank_start); |
Russell King | a013053 | 2005-06-27 14:16:47 +0100 | [diff] [blame] | 415 | |
Michael Bohan | 3260e52 | 2010-06-14 13:06:56 -0700 | [diff] [blame] | 416 | /* |
| 417 | * Align up here since the VM subsystem insists that the |
| 418 | * memmap entries are valid from the bank end aligned to |
| 419 | * MAX_ORDER_NR_PAGES. |
| 420 | */ |
| 421 | prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES); |
Russell King | a013053 | 2005-06-27 14:16:47 +0100 | [diff] [blame] | 422 | } |
| 423 | } |
| 424 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | /* |
| 426 | * mem_init() marks the free areas in the mem_map and tells us how much |
| 427 | * memory is free. This is done after various parts of the system have |
| 428 | * claimed their memory after the kernel image. |
| 429 | */ |
| 430 | void __init mem_init(void) |
| 431 | { |
Fenkart/Bostandzhyan | db9ef1a | 2010-02-07 21:45:47 +0100 | [diff] [blame] | 432 | unsigned long reserved_pages, free_pages; |
Russell King | be37030 | 2010-05-07 17:40:33 +0100 | [diff] [blame] | 433 | int i; |
Linus Walleij | 1dbd30e | 2010-07-12 21:53:28 +0100 | [diff] [blame] | 434 | #ifdef CONFIG_HAVE_TCM |
| 435 | /* These pointers are filled in on TCM detection */ |
| 436 | extern u32 dtcm_end; |
| 437 | extern u32 itcm_end; |
| 438 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | |
Nicolas Pitre | 3835f6c | 2008-09-17 15:21:55 -0400 | [diff] [blame] | 440 | max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | /* this will put all unused low memory onto the freelists */ |
Russell King | be37030 | 2010-05-07 17:40:33 +0100 | [diff] [blame] | 443 | free_unused_memmap(&meminfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | |
Russell King | be37030 | 2010-05-07 17:40:33 +0100 | [diff] [blame] | 445 | totalram_pages += free_all_bootmem(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | |
| 447 | #ifdef CONFIG_SA1111 |
| 448 | /* now that our DMA memory is actually so designated, we can free it */ |
Nicolas Pitre | 6db015e | 2008-09-17 14:50:42 -0400 | [diff] [blame] | 449 | totalram_pages += free_area(PHYS_PFN_OFFSET, |
| 450 | __phys_to_pfn(__pa(swapper_pg_dir)), NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | #endif |
| 452 | |
Nicolas Pitre | 3835f6c | 2008-09-17 15:21:55 -0400 | [diff] [blame] | 453 | #ifdef CONFIG_HIGHMEM |
| 454 | /* set highmem page free */ |
Russell King | be37030 | 2010-05-07 17:40:33 +0100 | [diff] [blame] | 455 | for_each_bank (i, &meminfo) { |
| 456 | unsigned long start = bank_pfn_start(&meminfo.bank[i]); |
| 457 | unsigned long end = bank_pfn_end(&meminfo.bank[i]); |
| 458 | if (start >= max_low_pfn + PHYS_PFN_OFFSET) |
| 459 | totalhigh_pages += free_area(start, end, NULL); |
Nicolas Pitre | 3835f6c | 2008-09-17 15:21:55 -0400 | [diff] [blame] | 460 | } |
| 461 | totalram_pages += totalhigh_pages; |
| 462 | #endif |
| 463 | |
Fenkart/Bostandzhyan | db9ef1a | 2010-02-07 21:45:47 +0100 | [diff] [blame] | 464 | reserved_pages = free_pages = 0; |
| 465 | |
Russell King | be37030 | 2010-05-07 17:40:33 +0100 | [diff] [blame] | 466 | for_each_bank(i, &meminfo) { |
| 467 | struct membank *bank = &meminfo.bank[i]; |
| 468 | unsigned int pfn1, pfn2; |
| 469 | struct page *page, *end; |
Fenkart/Bostandzhyan | db9ef1a | 2010-02-07 21:45:47 +0100 | [diff] [blame] | 470 | |
Russell King | be37030 | 2010-05-07 17:40:33 +0100 | [diff] [blame] | 471 | pfn1 = bank_pfn_start(bank); |
| 472 | pfn2 = bank_pfn_end(bank); |
Fenkart/Bostandzhyan | db9ef1a | 2010-02-07 21:45:47 +0100 | [diff] [blame] | 473 | |
Russell King | be37030 | 2010-05-07 17:40:33 +0100 | [diff] [blame] | 474 | page = pfn_to_page(pfn1); |
| 475 | end = pfn_to_page(pfn2 - 1) + 1; |
Fenkart/Bostandzhyan | db9ef1a | 2010-02-07 21:45:47 +0100 | [diff] [blame] | 476 | |
Russell King | be37030 | 2010-05-07 17:40:33 +0100 | [diff] [blame] | 477 | do { |
| 478 | if (PageReserved(page)) |
| 479 | reserved_pages++; |
| 480 | else if (!page_count(page)) |
| 481 | free_pages++; |
| 482 | page++; |
| 483 | } while (page < end); |
Fenkart/Bostandzhyan | db9ef1a | 2010-02-07 21:45:47 +0100 | [diff] [blame] | 484 | } |
| 485 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | /* |
| 487 | * Since our memory may not be contiguous, calculate the |
| 488 | * real number of pages we have in this system |
| 489 | */ |
| 490 | printk(KERN_INFO "Memory:"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | num_physpages = 0; |
| 492 | for (i = 0; i < meminfo.nr_banks; i++) { |
Russell King | d2a38ef | 2008-10-01 16:56:15 +0100 | [diff] [blame] | 493 | num_physpages += bank_pfn_size(&meminfo.bank[i]); |
| 494 | printk(" %ldMB", bank_phys_size(&meminfo.bank[i]) >> 20); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); |
Nicolas Pitre | 6db015e | 2008-09-17 14:50:42 -0400 | [diff] [blame] | 497 | |
Fenkart/Bostandzhyan | db9ef1a | 2010-02-07 21:45:47 +0100 | [diff] [blame] | 498 | printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n", |
| 499 | nr_free_pages() << (PAGE_SHIFT-10), |
| 500 | free_pages << (PAGE_SHIFT-10), |
| 501 | reserved_pages << (PAGE_SHIFT-10), |
Andreas Fenkart | 4b52940 | 2010-01-08 14:42:31 -0800 | [diff] [blame] | 502 | totalhigh_pages << (PAGE_SHIFT-10)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | |
Fenkart/Bostandzhyan | db9ef1a | 2010-02-07 21:45:47 +0100 | [diff] [blame] | 504 | #define MLK(b, t) b, t, ((t) - (b)) >> 10 |
| 505 | #define MLM(b, t) b, t, ((t) - (b)) >> 20 |
| 506 | #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) |
| 507 | |
| 508 | printk(KERN_NOTICE "Virtual kernel memory layout:\n" |
| 509 | " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" |
Linus Walleij | 07d2a5c | 2010-07-12 21:52:34 +0100 | [diff] [blame] | 510 | #ifdef CONFIG_HAVE_TCM |
Linus Walleij | 07d2a5c | 2010-07-12 21:52:34 +0100 | [diff] [blame] | 511 | " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n" |
Linus Walleij | 07d2a5c | 2010-07-12 21:52:34 +0100 | [diff] [blame] | 512 | " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n" |
| 513 | #endif |
Fenkart/Bostandzhyan | db9ef1a | 2010-02-07 21:45:47 +0100 | [diff] [blame] | 514 | " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" |
Fenkart/Bostandzhyan | a7bd08c | 2010-02-07 21:46:33 +0100 | [diff] [blame] | 515 | #ifdef CONFIG_MMU |
| 516 | " DMA : 0x%08lx - 0x%08lx (%4ld MB)\n" |
| 517 | #endif |
Fenkart/Bostandzhyan | db9ef1a | 2010-02-07 21:45:47 +0100 | [diff] [blame] | 518 | " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" |
| 519 | " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" |
| 520 | #ifdef CONFIG_HIGHMEM |
| 521 | " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" |
| 522 | #endif |
| 523 | " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" |
| 524 | " .init : 0x%p" " - 0x%p" " (%4d kB)\n" |
| 525 | " .text : 0x%p" " - 0x%p" " (%4d kB)\n" |
| 526 | " .data : 0x%p" " - 0x%p" " (%4d kB)\n", |
| 527 | |
| 528 | MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) + |
| 529 | (PAGE_SIZE)), |
Linus Walleij | 07d2a5c | 2010-07-12 21:52:34 +0100 | [diff] [blame] | 530 | #ifdef CONFIG_HAVE_TCM |
Linus Walleij | 1dbd30e | 2010-07-12 21:53:28 +0100 | [diff] [blame] | 531 | MLK(DTCM_OFFSET, (unsigned long) dtcm_end), |
| 532 | MLK(ITCM_OFFSET, (unsigned long) itcm_end), |
Linus Walleij | 07d2a5c | 2010-07-12 21:52:34 +0100 | [diff] [blame] | 533 | #endif |
Fenkart/Bostandzhyan | db9ef1a | 2010-02-07 21:45:47 +0100 | [diff] [blame] | 534 | MLK(FIXADDR_START, FIXADDR_TOP), |
Fenkart/Bostandzhyan | a7bd08c | 2010-02-07 21:46:33 +0100 | [diff] [blame] | 535 | #ifdef CONFIG_MMU |
| 536 | MLM(CONSISTENT_BASE, CONSISTENT_END), |
| 537 | #endif |
Fenkart/Bostandzhyan | c931b4f | 2010-02-07 21:47:17 +0100 | [diff] [blame] | 538 | MLM(VMALLOC_START, VMALLOC_END), |
Fenkart/Bostandzhyan | db9ef1a | 2010-02-07 21:45:47 +0100 | [diff] [blame] | 539 | MLM(PAGE_OFFSET, (unsigned long)high_memory), |
| 540 | #ifdef CONFIG_HIGHMEM |
| 541 | MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) * |
| 542 | (PAGE_SIZE)), |
| 543 | #endif |
| 544 | MLM(MODULES_VADDR, MODULES_END), |
| 545 | |
| 546 | MLK_ROUNDUP(__init_begin, __init_end), |
| 547 | MLK_ROUNDUP(_text, _etext), |
Russell King | 842eab4 | 2010-10-01 14:12:22 +0100 | [diff] [blame^] | 548 | MLK_ROUNDUP(_sdata, _edata)); |
Fenkart/Bostandzhyan | db9ef1a | 2010-02-07 21:45:47 +0100 | [diff] [blame] | 549 | |
| 550 | #undef MLK |
| 551 | #undef MLM |
| 552 | #undef MLK_ROUNDUP |
| 553 | |
Fenkart/Bostandzhyan | a183927 | 2010-02-07 21:47:58 +0100 | [diff] [blame] | 554 | /* |
| 555 | * Check boundaries twice: Some fundamental inconsistencies can |
| 556 | * be detected at build time already. |
| 557 | */ |
| 558 | #ifdef CONFIG_MMU |
| 559 | BUILD_BUG_ON(VMALLOC_END > CONSISTENT_BASE); |
| 560 | BUG_ON(VMALLOC_END > CONSISTENT_BASE); |
| 561 | |
| 562 | BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); |
| 563 | BUG_ON(TASK_SIZE > MODULES_VADDR); |
| 564 | #endif |
| 565 | |
| 566 | #ifdef CONFIG_HIGHMEM |
| 567 | BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); |
| 568 | BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); |
| 569 | #endif |
| 570 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | if (PAGE_SIZE >= 16384 && num_physpages <= 128) { |
| 572 | extern int sysctl_overcommit_memory; |
| 573 | /* |
| 574 | * On a machine this small we won't get |
| 575 | * anywhere without overcommit, so turn |
| 576 | * it on by default. |
| 577 | */ |
| 578 | sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; |
| 579 | } |
| 580 | } |
| 581 | |
| 582 | void free_initmem(void) |
| 583 | { |
Linus Walleij | bc58177 | 2009-09-15 17:30:37 +0100 | [diff] [blame] | 584 | #ifdef CONFIG_HAVE_TCM |
Linus Walleij | ea208f6 | 2010-05-26 07:37:57 +0100 | [diff] [blame] | 585 | extern char __tcm_start, __tcm_end; |
Linus Walleij | bc58177 | 2009-09-15 17:30:37 +0100 | [diff] [blame] | 586 | |
Linus Walleij | ea208f6 | 2010-05-26 07:37:57 +0100 | [diff] [blame] | 587 | totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)), |
| 588 | __phys_to_pfn(__pa(&__tcm_end)), |
Linus Walleij | bc58177 | 2009-09-15 17:30:37 +0100 | [diff] [blame] | 589 | "TCM link"); |
| 590 | #endif |
| 591 | |
Nicolas Pitre | 6db015e | 2008-09-17 14:50:42 -0400 | [diff] [blame] | 592 | if (!machine_is_integrator() && !machine_is_cintegrator()) |
Russell King | 37efe64 | 2008-12-01 11:53:07 +0000 | [diff] [blame] | 593 | totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)), |
| 594 | __phys_to_pfn(__pa(__init_end)), |
Nicolas Pitre | 6db015e | 2008-09-17 14:50:42 -0400 | [diff] [blame] | 595 | "init"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | } |
| 597 | |
| 598 | #ifdef CONFIG_BLK_DEV_INITRD |
| 599 | |
| 600 | static int keep_initrd; |
| 601 | |
| 602 | void free_initrd_mem(unsigned long start, unsigned long end) |
| 603 | { |
| 604 | if (!keep_initrd) |
Nicolas Pitre | 6db015e | 2008-09-17 14:50:42 -0400 | [diff] [blame] | 605 | totalram_pages += free_area(__phys_to_pfn(__pa(start)), |
| 606 | __phys_to_pfn(__pa(end)), |
| 607 | "initrd"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | } |
| 609 | |
| 610 | static int __init keepinitrd_setup(char *__unused) |
| 611 | { |
| 612 | keep_initrd = 1; |
| 613 | return 1; |
| 614 | } |
| 615 | |
| 616 | __setup("keepinitrd", keepinitrd_setup); |
| 617 | #endif |