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 | */ |
| 10 | #include <linux/config.h> |
| 11 | #include <linux/kernel.h> |
| 12 | #include <linux/errno.h> |
| 13 | #include <linux/ptrace.h> |
| 14 | #include <linux/swap.h> |
| 15 | #include <linux/init.h> |
| 16 | #include <linux/bootmem.h> |
| 17 | #include <linux/mman.h> |
| 18 | #include <linux/nodemask.h> |
| 19 | #include <linux/initrd.h> |
| 20 | |
| 21 | #include <asm/mach-types.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <asm/setup.h> |
Russell King | 74d02fb | 2006-04-04 21:47:43 +0100 | [diff] [blame] | 23 | #include <asm/sizes.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <asm/tlb.h> |
| 25 | |
| 26 | #include <asm/mach/arch.h> |
| 27 | #include <asm/mach/map.h> |
| 28 | |
| 29 | #define TABLE_SIZE (2 * PTRS_PER_PTE * sizeof(pte_t)) |
| 30 | |
| 31 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); |
| 32 | |
| 33 | extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; |
| 34 | extern void _stext, _text, _etext, __data_start, _end, __init_begin, __init_end; |
| 35 | extern unsigned long phys_initrd_start; |
| 36 | extern unsigned long phys_initrd_size; |
| 37 | |
| 38 | /* |
| 39 | * The sole use of this is to pass memory configuration |
| 40 | * data from paging_init to mem_init. |
| 41 | */ |
| 42 | static struct meminfo meminfo __initdata = { 0, }; |
| 43 | |
| 44 | /* |
| 45 | * empty_zero_page is a special page that is used for |
| 46 | * zero-initialized data and COW. |
| 47 | */ |
| 48 | struct page *empty_zero_page; |
| 49 | |
| 50 | void show_mem(void) |
| 51 | { |
| 52 | int free = 0, total = 0, reserved = 0; |
| 53 | int shared = 0, cached = 0, slab = 0, node; |
| 54 | |
| 55 | printk("Mem-info:\n"); |
| 56 | show_free_areas(); |
| 57 | printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); |
| 58 | |
| 59 | for_each_online_node(node) { |
| 60 | struct page *page, *end; |
| 61 | |
| 62 | page = NODE_MEM_MAP(node); |
| 63 | end = page + NODE_DATA(node)->node_spanned_pages; |
| 64 | |
| 65 | do { |
| 66 | total++; |
| 67 | if (PageReserved(page)) |
| 68 | reserved++; |
| 69 | else if (PageSwapCache(page)) |
| 70 | cached++; |
| 71 | else if (PageSlab(page)) |
| 72 | slab++; |
| 73 | else if (!page_count(page)) |
| 74 | free++; |
| 75 | else |
| 76 | shared += page_count(page) - 1; |
| 77 | page++; |
| 78 | } while (page < end); |
| 79 | } |
| 80 | |
| 81 | printk("%d pages of RAM\n", total); |
| 82 | printk("%d free pages\n", free); |
| 83 | printk("%d reserved pages\n", reserved); |
| 84 | printk("%d slab pages\n", slab); |
| 85 | printk("%d pages shared\n", shared); |
| 86 | printk("%d pages swap cached\n", cached); |
| 87 | } |
| 88 | |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 89 | static inline pmd_t *pmd_off(pgd_t *pgd, unsigned long virt) |
| 90 | { |
| 91 | return pmd_offset(pgd, virt); |
| 92 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 94 | static inline pmd_t *pmd_off_k(unsigned long virt) |
| 95 | { |
| 96 | return pmd_off(pgd_offset_k(virt), virt); |
| 97 | } |
| 98 | |
| 99 | #define for_each_nodebank(iter,mi,no) \ |
| 100 | for (iter = 0; iter < mi->nr_banks; iter++) \ |
| 101 | if (mi->bank[iter].node == no) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | |
| 103 | /* |
| 104 | * FIXME: We really want to avoid allocating the bootmap bitmap |
| 105 | * over the top of the initrd. Hopefully, this is located towards |
| 106 | * the start of a bank, so if we allocate the bootmap bitmap at |
| 107 | * the end, we won't clash. |
| 108 | */ |
| 109 | static unsigned int __init |
| 110 | find_bootmap_pfn(int node, struct meminfo *mi, unsigned int bootmap_pages) |
| 111 | { |
| 112 | unsigned int start_pfn, bank, bootmap_pfn; |
| 113 | |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 114 | start_pfn = PAGE_ALIGN(__pa(&_end)) >> PAGE_SHIFT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | bootmap_pfn = 0; |
| 116 | |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 117 | for_each_nodebank(bank, mi, node) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | unsigned int start, end; |
| 119 | |
Russell King | 92a8cbe | 2005-06-22 21:47:25 +0100 | [diff] [blame] | 120 | start = mi->bank[bank].start >> PAGE_SHIFT; |
| 121 | end = (mi->bank[bank].size + |
| 122 | mi->bank[bank].start) >> PAGE_SHIFT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | |
| 124 | if (end < start_pfn) |
| 125 | continue; |
| 126 | |
| 127 | if (start < start_pfn) |
| 128 | start = start_pfn; |
| 129 | |
| 130 | if (end <= start) |
| 131 | continue; |
| 132 | |
| 133 | if (end - start >= bootmap_pages) { |
| 134 | bootmap_pfn = start; |
| 135 | break; |
| 136 | } |
| 137 | } |
| 138 | |
| 139 | if (bootmap_pfn == 0) |
| 140 | BUG(); |
| 141 | |
| 142 | return bootmap_pfn; |
| 143 | } |
| 144 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | static int __init check_initrd(struct meminfo *mi) |
| 146 | { |
| 147 | int initrd_node = -2; |
| 148 | #ifdef CONFIG_BLK_DEV_INITRD |
| 149 | unsigned long end = phys_initrd_start + phys_initrd_size; |
| 150 | |
| 151 | /* |
| 152 | * Make sure that the initrd is within a valid area of |
| 153 | * memory. |
| 154 | */ |
| 155 | if (phys_initrd_size) { |
| 156 | unsigned int i; |
| 157 | |
| 158 | initrd_node = -1; |
| 159 | |
| 160 | for (i = 0; i < mi->nr_banks; i++) { |
| 161 | unsigned long bank_end; |
| 162 | |
| 163 | bank_end = mi->bank[i].start + mi->bank[i].size; |
| 164 | |
| 165 | if (mi->bank[i].start <= phys_initrd_start && |
| 166 | end <= bank_end) |
| 167 | initrd_node = mi->bank[i].node; |
| 168 | } |
| 169 | } |
| 170 | |
| 171 | if (initrd_node == -1) { |
| 172 | printk(KERN_ERR "initrd (0x%08lx - 0x%08lx) extends beyond " |
| 173 | "physical memory - disabling initrd\n", |
| 174 | phys_initrd_start, end); |
| 175 | phys_initrd_start = phys_initrd_size = 0; |
| 176 | } |
| 177 | #endif |
| 178 | |
| 179 | return initrd_node; |
| 180 | } |
| 181 | |
| 182 | /* |
| 183 | * Reserve the various regions of node 0 |
| 184 | */ |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 185 | static __init void reserve_node_zero(pg_data_t *pgdat) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | unsigned long res_size = 0; |
| 188 | |
| 189 | /* |
| 190 | * Register the kernel text and data with bootmem. |
| 191 | * Note that this can only be in node 0. |
| 192 | */ |
| 193 | #ifdef CONFIG_XIP_KERNEL |
| 194 | reserve_bootmem_node(pgdat, __pa(&__data_start), &_end - &__data_start); |
| 195 | #else |
| 196 | reserve_bootmem_node(pgdat, __pa(&_stext), &_end - &_stext); |
| 197 | #endif |
| 198 | |
| 199 | /* |
| 200 | * Reserve the page tables. These are already in use, |
| 201 | * and can only be in node 0. |
| 202 | */ |
| 203 | reserve_bootmem_node(pgdat, __pa(swapper_pg_dir), |
| 204 | PTRS_PER_PGD * sizeof(pgd_t)); |
| 205 | |
| 206 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | * Hmm... This should go elsewhere, but we really really need to |
| 208 | * stop things allocating the low memory; ideally we need a better |
| 209 | * implementation of GFP_DMA which does not assume that DMA-able |
| 210 | * memory starts at zero. |
| 211 | */ |
| 212 | if (machine_is_integrator() || machine_is_cintegrator()) |
| 213 | res_size = __pa(swapper_pg_dir) - PHYS_OFFSET; |
| 214 | |
| 215 | /* |
| 216 | * These should likewise go elsewhere. They pre-reserve the |
| 217 | * screen memory region at the start of main system memory. |
| 218 | */ |
| 219 | if (machine_is_edb7211()) |
| 220 | res_size = 0x00020000; |
| 221 | if (machine_is_p720t()) |
| 222 | res_size = 0x00014000; |
| 223 | |
| 224 | #ifdef CONFIG_SA1111 |
| 225 | /* |
| 226 | * Because of the SA1111 DMA bug, we want to preserve our |
| 227 | * precious DMA-able memory... |
| 228 | */ |
| 229 | res_size = __pa(swapper_pg_dir) - PHYS_OFFSET; |
| 230 | #endif |
| 231 | if (res_size) |
| 232 | reserve_bootmem_node(pgdat, PHYS_OFFSET, res_size); |
| 233 | } |
| 234 | |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 235 | void __init build_mem_type_table(void); |
| 236 | void __init create_mapping(struct map_desc *md); |
| 237 | |
| 238 | static unsigned long __init |
| 239 | bootmem_init_node(int node, int initrd_node, struct meminfo *mi) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | { |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 241 | unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; |
| 242 | unsigned long start_pfn, end_pfn, boot_pfn; |
| 243 | unsigned int boot_pages; |
| 244 | pg_data_t *pgdat; |
| 245 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 247 | start_pfn = -1UL; |
| 248 | end_pfn = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | |
| 250 | /* |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 251 | * Calculate the pfn range, and map the memory banks for this node. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | */ |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 253 | for_each_nodebank(i, mi, node) { |
| 254 | unsigned long start, end; |
| 255 | struct map_desc map; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 257 | start = mi->bank[i].start >> PAGE_SHIFT; |
| 258 | end = (mi->bank[i].start + mi->bank[i].size) >> PAGE_SHIFT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 260 | if (start_pfn > start) |
| 261 | start_pfn = start; |
| 262 | if (end_pfn < end) |
| 263 | end_pfn = end; |
| 264 | |
Deepak Saxena | 9769c24 | 2005-10-28 15:19:11 +0100 | [diff] [blame] | 265 | map.pfn = __phys_to_pfn(mi->bank[i].start); |
| 266 | map.virtual = __phys_to_virt(mi->bank[i].start); |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 267 | map.length = mi->bank[i].size; |
| 268 | map.type = MT_MEMORY; |
| 269 | |
| 270 | create_mapping(&map); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | } |
| 272 | |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 273 | /* |
| 274 | * If there is no memory in this node, ignore it. |
| 275 | */ |
| 276 | if (end_pfn == 0) |
| 277 | return end_pfn; |
| 278 | |
| 279 | /* |
| 280 | * Allocate the bootmem bitmap page. |
| 281 | */ |
| 282 | boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn); |
| 283 | boot_pfn = find_bootmap_pfn(node, mi, boot_pages); |
| 284 | |
| 285 | /* |
| 286 | * Initialise the bootmem allocator for this node, handing the |
| 287 | * memory banks over to bootmem. |
| 288 | */ |
| 289 | node_set_online(node); |
| 290 | pgdat = NODE_DATA(node); |
| 291 | init_bootmem_node(pgdat, boot_pfn, start_pfn, end_pfn); |
| 292 | |
| 293 | for_each_nodebank(i, mi, node) |
| 294 | free_bootmem_node(pgdat, mi->bank[i].start, mi->bank[i].size); |
| 295 | |
| 296 | /* |
| 297 | * Reserve the bootmem bitmap for this node. |
| 298 | */ |
| 299 | reserve_bootmem_node(pgdat, boot_pfn << PAGE_SHIFT, |
| 300 | boot_pages << PAGE_SHIFT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | |
| 302 | #ifdef CONFIG_BLK_DEV_INITRD |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 303 | /* |
| 304 | * If the initrd is in this node, reserve its memory. |
| 305 | */ |
| 306 | if (node == initrd_node) { |
| 307 | reserve_bootmem_node(pgdat, phys_initrd_start, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | phys_initrd_size); |
| 309 | initrd_start = __phys_to_virt(phys_initrd_start); |
| 310 | initrd_end = initrd_start + phys_initrd_size; |
| 311 | } |
| 312 | #endif |
| 313 | |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 314 | /* |
| 315 | * Finally, reserve any node zero regions. |
| 316 | */ |
| 317 | if (node == 0) |
| 318 | reserve_node_zero(pgdat); |
| 319 | |
| 320 | /* |
| 321 | * initialise the zones within this node. |
| 322 | */ |
| 323 | memset(zone_size, 0, sizeof(zone_size)); |
| 324 | memset(zhole_size, 0, sizeof(zhole_size)); |
| 325 | |
| 326 | /* |
| 327 | * The size of this node has already been determined. If we need |
| 328 | * to do anything fancy with the allocation of this memory to the |
| 329 | * zones, now is the time to do it. |
| 330 | */ |
| 331 | zone_size[0] = end_pfn - start_pfn; |
| 332 | |
| 333 | /* |
| 334 | * For each bank in this node, calculate the size of the holes. |
| 335 | * holes = node_size - sum(bank_sizes_in_node) |
| 336 | */ |
| 337 | zhole_size[0] = zone_size[0]; |
| 338 | for_each_nodebank(i, mi, node) |
| 339 | zhole_size[0] -= mi->bank[i].size >> PAGE_SHIFT; |
| 340 | |
| 341 | /* |
| 342 | * Adjust the sizes according to any special requirements for |
| 343 | * this machine type. |
| 344 | */ |
| 345 | arch_adjust_zones(node, zone_size, zhole_size); |
| 346 | |
| 347 | free_area_init_node(node, pgdat, zone_size, start_pfn, zhole_size); |
| 348 | |
| 349 | return end_pfn; |
| 350 | } |
| 351 | |
| 352 | static void __init bootmem_init(struct meminfo *mi) |
| 353 | { |
| 354 | unsigned long addr, memend_pfn = 0; |
| 355 | int node, initrd_node, i; |
| 356 | |
| 357 | /* |
| 358 | * Invalidate the node number for empty or invalid memory banks |
| 359 | */ |
| 360 | for (i = 0; i < mi->nr_banks; i++) |
| 361 | if (mi->bank[i].size == 0 || mi->bank[i].node >= MAX_NUMNODES) |
| 362 | mi->bank[i].node = -1; |
| 363 | |
| 364 | memcpy(&meminfo, mi, sizeof(meminfo)); |
| 365 | |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 366 | /* |
| 367 | * Clear out all the mappings below the kernel image. |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 368 | */ |
Nicolas Pitre | 1a47ebc | 2005-10-29 16:28:29 +0100 | [diff] [blame] | 369 | for (addr = 0; addr < MODULE_START; addr += PGDIR_SIZE) |
| 370 | pmd_clear(pmd_off_k(addr)); |
| 371 | #ifdef CONFIG_XIP_KERNEL |
| 372 | /* The XIP kernel is mapped in the module area -- skip over it */ |
| 373 | addr = ((unsigned long)&_etext + PGDIR_SIZE - 1) & PGDIR_MASK; |
| 374 | #endif |
| 375 | for ( ; addr < PAGE_OFFSET; addr += PGDIR_SIZE) |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 376 | pmd_clear(pmd_off_k(addr)); |
| 377 | |
| 378 | /* |
| 379 | * Clear out all the kernel space mappings, except for the first |
| 380 | * memory bank, up to the end of the vmalloc region. |
| 381 | */ |
| 382 | for (addr = __phys_to_virt(mi->bank[0].start + mi->bank[0].size); |
| 383 | addr < VMALLOC_END; addr += PGDIR_SIZE) |
| 384 | pmd_clear(pmd_off_k(addr)); |
| 385 | |
| 386 | /* |
| 387 | * Locate which node contains the ramdisk image, if any. |
| 388 | */ |
| 389 | initrd_node = check_initrd(mi); |
| 390 | |
| 391 | /* |
| 392 | * Run through each node initialising the bootmem allocator. |
| 393 | */ |
| 394 | for_each_node(node) { |
| 395 | unsigned long end_pfn; |
| 396 | |
| 397 | end_pfn = bootmem_init_node(node, initrd_node, mi); |
| 398 | |
| 399 | /* |
| 400 | * Remember the highest memory PFN. |
| 401 | */ |
| 402 | if (end_pfn > memend_pfn) |
| 403 | memend_pfn = end_pfn; |
| 404 | } |
| 405 | |
| 406 | high_memory = __va(memend_pfn << PAGE_SHIFT); |
| 407 | |
| 408 | /* |
| 409 | * This doesn't seem to be used by the Linux memory manager any |
| 410 | * more, but is used by ll_rw_block. If we can get rid of it, we |
| 411 | * also get rid of some of the stuff above as well. |
| 412 | * |
| 413 | * Note: max_low_pfn and max_pfn reflect the number of _pages_ in |
| 414 | * the system, not the maximum PFN. |
| 415 | */ |
| 416 | max_pfn = max_low_pfn = memend_pfn - PHYS_PFN_OFFSET; |
| 417 | } |
| 418 | |
| 419 | /* |
| 420 | * Set up device the mappings. Since we clear out the page tables for all |
| 421 | * mappings above VMALLOC_END, we will remove any debug device mappings. |
| 422 | * This means you have to be careful how you debug this function, or any |
Russell King | 02b3083 | 2005-11-17 22:43:30 +0000 | [diff] [blame] | 423 | * called function. This means you can't use any function or debugging |
| 424 | * method which may touch any device, otherwise the kernel _will_ crash. |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 425 | */ |
| 426 | static void __init devicemaps_init(struct machine_desc *mdesc) |
| 427 | { |
| 428 | struct map_desc map; |
| 429 | unsigned long addr; |
| 430 | void *vectors; |
| 431 | |
Russell King | 02b3083 | 2005-11-17 22:43:30 +0000 | [diff] [blame] | 432 | /* |
| 433 | * Allocate the vector page early. |
| 434 | */ |
| 435 | vectors = alloc_bootmem_low_pages(PAGE_SIZE); |
| 436 | BUG_ON(!vectors); |
| 437 | |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 438 | for (addr = VMALLOC_END; addr; addr += PGDIR_SIZE) |
| 439 | pmd_clear(pmd_off_k(addr)); |
| 440 | |
| 441 | /* |
Nicolas Pitre | 1a47ebc | 2005-10-29 16:28:29 +0100 | [diff] [blame] | 442 | * Map the kernel if it is XIP. |
| 443 | * It is always first in the modulearea. |
| 444 | */ |
| 445 | #ifdef CONFIG_XIP_KERNEL |
| 446 | map.pfn = __phys_to_pfn(CONFIG_XIP_PHYS_ADDR & PGDIR_MASK); |
| 447 | map.virtual = MODULE_START; |
| 448 | map.length = ((unsigned long)&_etext - map.virtual + ~PGDIR_MASK) & PGDIR_MASK; |
| 449 | map.type = MT_ROM; |
| 450 | create_mapping(&map); |
| 451 | #endif |
| 452 | |
| 453 | /* |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 454 | * Map the cache flushing regions. |
| 455 | */ |
| 456 | #ifdef FLUSH_BASE |
Deepak Saxena | 9769c24 | 2005-10-28 15:19:11 +0100 | [diff] [blame] | 457 | map.pfn = __phys_to_pfn(FLUSH_BASE_PHYS); |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 458 | map.virtual = FLUSH_BASE; |
Russell King | 74d02fb | 2006-04-04 21:47:43 +0100 | [diff] [blame] | 459 | map.length = SZ_1M; |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 460 | map.type = MT_CACHECLEAN; |
| 461 | create_mapping(&map); |
| 462 | #endif |
| 463 | #ifdef FLUSH_BASE_MINICACHE |
Russell King | 74d02fb | 2006-04-04 21:47:43 +0100 | [diff] [blame] | 464 | map.pfn = __phys_to_pfn(FLUSH_BASE_PHYS + SZ_1M); |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 465 | map.virtual = FLUSH_BASE_MINICACHE; |
Russell King | 74d02fb | 2006-04-04 21:47:43 +0100 | [diff] [blame] | 466 | map.length = SZ_1M; |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 467 | map.type = MT_MINICLEAN; |
| 468 | create_mapping(&map); |
| 469 | #endif |
| 470 | |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 471 | /* |
| 472 | * Create a mapping for the machine vectors at the high-vectors |
| 473 | * location (0xffff0000). If we aren't using high-vectors, also |
| 474 | * create a mapping at the low-vectors virtual address. |
| 475 | */ |
Deepak Saxena | 9769c24 | 2005-10-28 15:19:11 +0100 | [diff] [blame] | 476 | map.pfn = __phys_to_pfn(virt_to_phys(vectors)); |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 477 | map.virtual = 0xffff0000; |
| 478 | map.length = PAGE_SIZE; |
| 479 | map.type = MT_HIGH_VECTORS; |
| 480 | create_mapping(&map); |
| 481 | |
| 482 | if (!vectors_high()) { |
| 483 | map.virtual = 0; |
| 484 | map.type = MT_LOW_VECTORS; |
| 485 | create_mapping(&map); |
| 486 | } |
| 487 | |
| 488 | /* |
| 489 | * Ask the machine support to map in the statically mapped devices. |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 490 | */ |
| 491 | if (mdesc->map_io) |
| 492 | mdesc->map_io(); |
Russell King | 6bf7bd6 | 2005-11-02 14:11:35 +0000 | [diff] [blame] | 493 | |
| 494 | /* |
Russell King | 02b3083 | 2005-11-17 22:43:30 +0000 | [diff] [blame] | 495 | * Finally flush the caches and tlb to ensure that we're in a |
| 496 | * consistent state wrt the writebuffer. This also ensures that |
| 497 | * any write-allocated cache lines in the vector page are written |
| 498 | * back. After this point, we can start to touch devices again. |
Russell King | 6bf7bd6 | 2005-11-02 14:11:35 +0000 | [diff] [blame] | 499 | */ |
| 500 | local_flush_tlb_all(); |
Russell King | 02b3083 | 2005-11-17 22:43:30 +0000 | [diff] [blame] | 501 | flush_cache_all(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | } |
| 503 | |
| 504 | /* |
| 505 | * paging_init() sets up the page tables, initialises the zone memory |
| 506 | * maps, and sets up the zero page, bad page and bad page tables. |
| 507 | */ |
| 508 | void __init paging_init(struct meminfo *mi, struct machine_desc *mdesc) |
| 509 | { |
| 510 | void *zero_page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 512 | build_mem_type_table(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | bootmem_init(mi); |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 514 | devicemaps_init(mdesc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 516 | top_pmd = pmd_off_k(0xffff0000); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | |
| 518 | /* |
| 519 | * allocate the zero page. Note that we count on this going ok. |
| 520 | */ |
| 521 | zero_page = alloc_bootmem_low_pages(PAGE_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | memzero(zero_page, PAGE_SIZE); |
| 523 | empty_zero_page = virt_to_page(zero_page); |
| 524 | flush_dcache_page(empty_zero_page); |
| 525 | } |
| 526 | |
| 527 | static inline void free_area(unsigned long addr, unsigned long end, char *s) |
| 528 | { |
| 529 | unsigned int size = (end - addr) >> 10; |
| 530 | |
| 531 | for (; addr < end; addr += PAGE_SIZE) { |
| 532 | struct page *page = virt_to_page(addr); |
| 533 | ClearPageReserved(page); |
Nick Piggin | 7835e98 | 2006-03-22 00:08:40 -0800 | [diff] [blame] | 534 | init_page_count(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | free_page(addr); |
| 536 | totalram_pages++; |
| 537 | } |
| 538 | |
| 539 | if (size && s) |
| 540 | printk(KERN_INFO "Freeing %s memory: %dK\n", s, size); |
| 541 | } |
| 542 | |
Russell King | a013053 | 2005-06-27 14:16:47 +0100 | [diff] [blame] | 543 | static inline void |
| 544 | free_memmap(int node, unsigned long start_pfn, unsigned long end_pfn) |
| 545 | { |
| 546 | struct page *start_pg, *end_pg; |
| 547 | unsigned long pg, pgend; |
| 548 | |
| 549 | /* |
| 550 | * Convert start_pfn/end_pfn to a struct page pointer. |
| 551 | */ |
| 552 | start_pg = pfn_to_page(start_pfn); |
| 553 | end_pg = pfn_to_page(end_pfn); |
| 554 | |
| 555 | /* |
| 556 | * Convert to physical addresses, and |
| 557 | * round start upwards and end downwards. |
| 558 | */ |
| 559 | pg = PAGE_ALIGN(__pa(start_pg)); |
| 560 | pgend = __pa(end_pg) & PAGE_MASK; |
| 561 | |
| 562 | /* |
| 563 | * If there are free pages between these, |
| 564 | * free the section of the memmap array. |
| 565 | */ |
| 566 | if (pg < pgend) |
| 567 | free_bootmem_node(NODE_DATA(node), pg, pgend - pg); |
| 568 | } |
| 569 | |
| 570 | /* |
| 571 | * The mem_map array can get very big. Free the unused area of the memory map. |
| 572 | */ |
| 573 | static void __init free_unused_memmap_node(int node, struct meminfo *mi) |
| 574 | { |
| 575 | unsigned long bank_start, prev_bank_end = 0; |
| 576 | unsigned int i; |
| 577 | |
| 578 | /* |
| 579 | * [FIXME] This relies on each bank being in address order. This |
| 580 | * may not be the case, especially if the user has provided the |
| 581 | * information on the command line. |
| 582 | */ |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 583 | for_each_nodebank(i, mi, node) { |
Russell King | a013053 | 2005-06-27 14:16:47 +0100 | [diff] [blame] | 584 | bank_start = mi->bank[i].start >> PAGE_SHIFT; |
| 585 | if (bank_start < prev_bank_end) { |
| 586 | printk(KERN_ERR "MEM: unordered memory banks. " |
| 587 | "Not freeing memmap.\n"); |
| 588 | break; |
| 589 | } |
| 590 | |
| 591 | /* |
| 592 | * If we had a previous bank, and there is a space |
| 593 | * between the current bank and the previous, free it. |
| 594 | */ |
| 595 | if (prev_bank_end && prev_bank_end != bank_start) |
| 596 | free_memmap(node, prev_bank_end, bank_start); |
| 597 | |
| 598 | prev_bank_end = (mi->bank[i].start + |
| 599 | mi->bank[i].size) >> PAGE_SHIFT; |
| 600 | } |
| 601 | } |
| 602 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | /* |
| 604 | * mem_init() marks the free areas in the mem_map and tells us how much |
| 605 | * memory is free. This is done after various parts of the system have |
| 606 | * claimed their memory after the kernel image. |
| 607 | */ |
| 608 | void __init mem_init(void) |
| 609 | { |
| 610 | unsigned int codepages, datapages, initpages; |
| 611 | int i, node; |
| 612 | |
| 613 | codepages = &_etext - &_text; |
| 614 | datapages = &_end - &__data_start; |
| 615 | initpages = &__init_end - &__init_begin; |
| 616 | |
| 617 | #ifndef CONFIG_DISCONTIGMEM |
| 618 | max_mapnr = virt_to_page(high_memory) - mem_map; |
| 619 | #endif |
| 620 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | /* this will put all unused low memory onto the freelists */ |
| 622 | for_each_online_node(node) { |
| 623 | pg_data_t *pgdat = NODE_DATA(node); |
| 624 | |
Russell King | a013053 | 2005-06-27 14:16:47 +0100 | [diff] [blame] | 625 | free_unused_memmap_node(node, &meminfo); |
| 626 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | if (pgdat->node_spanned_pages != 0) |
| 628 | totalram_pages += free_all_bootmem_node(pgdat); |
| 629 | } |
| 630 | |
| 631 | #ifdef CONFIG_SA1111 |
| 632 | /* now that our DMA memory is actually so designated, we can free it */ |
| 633 | free_area(PAGE_OFFSET, (unsigned long)swapper_pg_dir, NULL); |
| 634 | #endif |
| 635 | |
| 636 | /* |
| 637 | * Since our memory may not be contiguous, calculate the |
| 638 | * real number of pages we have in this system |
| 639 | */ |
| 640 | printk(KERN_INFO "Memory:"); |
| 641 | |
| 642 | num_physpages = 0; |
| 643 | for (i = 0; i < meminfo.nr_banks; i++) { |
| 644 | num_physpages += meminfo.bank[i].size >> PAGE_SHIFT; |
| 645 | printk(" %ldMB", meminfo.bank[i].size >> 20); |
| 646 | } |
| 647 | |
| 648 | printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); |
| 649 | printk(KERN_NOTICE "Memory: %luKB available (%dK code, " |
| 650 | "%dK data, %dK init)\n", |
| 651 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), |
| 652 | codepages >> 10, datapages >> 10, initpages >> 10); |
| 653 | |
| 654 | if (PAGE_SIZE >= 16384 && num_physpages <= 128) { |
| 655 | extern int sysctl_overcommit_memory; |
| 656 | /* |
| 657 | * On a machine this small we won't get |
| 658 | * anywhere without overcommit, so turn |
| 659 | * it on by default. |
| 660 | */ |
| 661 | sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; |
| 662 | } |
| 663 | } |
| 664 | |
| 665 | void free_initmem(void) |
| 666 | { |
| 667 | if (!machine_is_integrator() && !machine_is_cintegrator()) { |
| 668 | free_area((unsigned long)(&__init_begin), |
| 669 | (unsigned long)(&__init_end), |
| 670 | "init"); |
| 671 | } |
| 672 | } |
| 673 | |
| 674 | #ifdef CONFIG_BLK_DEV_INITRD |
| 675 | |
| 676 | static int keep_initrd; |
| 677 | |
| 678 | void free_initrd_mem(unsigned long start, unsigned long end) |
| 679 | { |
| 680 | if (!keep_initrd) |
| 681 | free_area(start, end, "initrd"); |
| 682 | } |
| 683 | |
| 684 | static int __init keepinitrd_setup(char *__unused) |
| 685 | { |
| 686 | keep_initrd = 1; |
| 687 | return 1; |
| 688 | } |
| 689 | |
| 690 | __setup("keepinitrd", keepinitrd_setup); |
| 691 | #endif |