Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/x86_64/mm/init.c |
| 3 | * |
| 4 | * Copyright (C) 1995 Linus Torvalds |
| 5 | * Copyright (C) 2000 Pavel Machek <pavel@suse.cz> |
| 6 | * Copyright (C) 2002,2003 Andi Kleen <ak@suse.de> |
| 7 | */ |
| 8 | |
| 9 | #include <linux/config.h> |
| 10 | #include <linux/signal.h> |
| 11 | #include <linux/sched.h> |
| 12 | #include <linux/kernel.h> |
| 13 | #include <linux/errno.h> |
| 14 | #include <linux/string.h> |
| 15 | #include <linux/types.h> |
| 16 | #include <linux/ptrace.h> |
| 17 | #include <linux/mman.h> |
| 18 | #include <linux/mm.h> |
| 19 | #include <linux/swap.h> |
| 20 | #include <linux/smp.h> |
| 21 | #include <linux/init.h> |
| 22 | #include <linux/pagemap.h> |
| 23 | #include <linux/bootmem.h> |
| 24 | #include <linux/proc_fs.h> |
Andi Kleen | 5917089 | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 25 | #include <linux/pci.h> |
Muli Ben-Yehuda | 17a941d | 2006-01-11 22:44:42 +0100 | [diff] [blame] | 26 | #include <linux/dma-mapping.h> |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 27 | #include <linux/module.h> |
| 28 | #include <linux/memory_hotplug.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | |
| 30 | #include <asm/processor.h> |
| 31 | #include <asm/system.h> |
| 32 | #include <asm/uaccess.h> |
| 33 | #include <asm/pgtable.h> |
| 34 | #include <asm/pgalloc.h> |
| 35 | #include <asm/dma.h> |
| 36 | #include <asm/fixmap.h> |
| 37 | #include <asm/e820.h> |
| 38 | #include <asm/apic.h> |
| 39 | #include <asm/tlb.h> |
| 40 | #include <asm/mmu_context.h> |
| 41 | #include <asm/proto.h> |
| 42 | #include <asm/smp.h> |
Andi Kleen | 2bc0414 | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 43 | #include <asm/sections.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | |
| 45 | #ifndef Dprintk |
| 46 | #define Dprintk(x...) |
| 47 | #endif |
| 48 | |
Muli Ben-Yehuda | 17a941d | 2006-01-11 22:44:42 +0100 | [diff] [blame] | 49 | struct dma_mapping_ops* dma_ops; |
| 50 | EXPORT_SYMBOL(dma_ops); |
| 51 | |
Andi Kleen | e18c687 | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 52 | static unsigned long dma_reserve __initdata; |
| 53 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); |
| 55 | |
| 56 | /* |
| 57 | * NOTE: pagetable_init alloc all the fixmap pagetables contiguous on the |
| 58 | * physical space so we can cache the place of the first one and move |
| 59 | * around without checking the pgd every time. |
| 60 | */ |
| 61 | |
| 62 | void show_mem(void) |
| 63 | { |
Andi Kleen | e92343c | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 64 | long i, total = 0, reserved = 0; |
| 65 | long shared = 0, cached = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | pg_data_t *pgdat; |
| 67 | struct page *page; |
| 68 | |
Andi Kleen | e92343c | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 69 | printk(KERN_INFO "Mem-info:\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | show_free_areas(); |
Andi Kleen | e92343c | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 71 | printk(KERN_INFO "Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | |
KAMEZAWA Hiroyuki | ec936fc | 2006-03-27 01:15:59 -0800 | [diff] [blame] | 73 | for_each_online_pgdat(pgdat) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | for (i = 0; i < pgdat->node_spanned_pages; ++i) { |
| 75 | page = pfn_to_page(pgdat->node_start_pfn + i); |
| 76 | total++; |
Andi Kleen | e92343c | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 77 | if (PageReserved(page)) |
| 78 | reserved++; |
| 79 | else if (PageSwapCache(page)) |
| 80 | cached++; |
| 81 | else if (page_count(page)) |
| 82 | shared += page_count(page) - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | } |
| 84 | } |
Andi Kleen | e92343c | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 85 | printk(KERN_INFO "%lu pages of RAM\n", total); |
| 86 | printk(KERN_INFO "%lu reserved pages\n",reserved); |
| 87 | printk(KERN_INFO "%lu pages shared\n",shared); |
| 88 | printk(KERN_INFO "%lu pages swap cached\n",cached); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | } |
| 90 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | int after_bootmem; |
| 92 | |
Andi Kleen | 5f44a66 | 2006-03-25 16:30:25 +0100 | [diff] [blame] | 93 | static __init void *spp_getpage(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | { |
| 95 | void *ptr; |
| 96 | if (after_bootmem) |
| 97 | ptr = (void *) get_zeroed_page(GFP_ATOMIC); |
| 98 | else |
| 99 | ptr = alloc_bootmem_pages(PAGE_SIZE); |
| 100 | if (!ptr || ((unsigned long)ptr & ~PAGE_MASK)) |
| 101 | panic("set_pte_phys: cannot allocate page data %s\n", after_bootmem?"after bootmem":""); |
| 102 | |
| 103 | Dprintk("spp_getpage %p\n", ptr); |
| 104 | return ptr; |
| 105 | } |
| 106 | |
Andi Kleen | 5f44a66 | 2006-03-25 16:30:25 +0100 | [diff] [blame] | 107 | static __init void set_pte_phys(unsigned long vaddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | unsigned long phys, pgprot_t prot) |
| 109 | { |
| 110 | pgd_t *pgd; |
| 111 | pud_t *pud; |
| 112 | pmd_t *pmd; |
| 113 | pte_t *pte, new_pte; |
| 114 | |
| 115 | Dprintk("set_pte_phys %lx to %lx\n", vaddr, phys); |
| 116 | |
| 117 | pgd = pgd_offset_k(vaddr); |
| 118 | if (pgd_none(*pgd)) { |
| 119 | printk("PGD FIXMAP MISSING, it should be setup in head.S!\n"); |
| 120 | return; |
| 121 | } |
| 122 | pud = pud_offset(pgd, vaddr); |
| 123 | if (pud_none(*pud)) { |
| 124 | pmd = (pmd_t *) spp_getpage(); |
| 125 | set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE | _PAGE_USER)); |
| 126 | if (pmd != pmd_offset(pud, 0)) { |
| 127 | printk("PAGETABLE BUG #01! %p <-> %p\n", pmd, pmd_offset(pud,0)); |
| 128 | return; |
| 129 | } |
| 130 | } |
| 131 | pmd = pmd_offset(pud, vaddr); |
| 132 | if (pmd_none(*pmd)) { |
| 133 | pte = (pte_t *) spp_getpage(); |
| 134 | set_pmd(pmd, __pmd(__pa(pte) | _KERNPG_TABLE | _PAGE_USER)); |
| 135 | if (pte != pte_offset_kernel(pmd, 0)) { |
| 136 | printk("PAGETABLE BUG #02!\n"); |
| 137 | return; |
| 138 | } |
| 139 | } |
| 140 | new_pte = pfn_pte(phys >> PAGE_SHIFT, prot); |
| 141 | |
| 142 | pte = pte_offset_kernel(pmd, vaddr); |
| 143 | if (!pte_none(*pte) && |
| 144 | pte_val(*pte) != (pte_val(new_pte) & __supported_pte_mask)) |
| 145 | pte_ERROR(*pte); |
| 146 | set_pte(pte, new_pte); |
| 147 | |
| 148 | /* |
| 149 | * It's enough to flush this one mapping. |
| 150 | * (PGE mappings get flushed as well) |
| 151 | */ |
| 152 | __flush_tlb_one(vaddr); |
| 153 | } |
| 154 | |
| 155 | /* NOTE: this is meant to be run only at boot */ |
Andi Kleen | 5f44a66 | 2006-03-25 16:30:25 +0100 | [diff] [blame] | 156 | void __init |
| 157 | __set_fixmap (enum fixed_addresses idx, unsigned long phys, pgprot_t prot) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | { |
| 159 | unsigned long address = __fix_to_virt(idx); |
| 160 | |
| 161 | if (idx >= __end_of_fixed_addresses) { |
| 162 | printk("Invalid __set_fixmap\n"); |
| 163 | return; |
| 164 | } |
| 165 | set_pte_phys(address, phys, prot); |
| 166 | } |
| 167 | |
| 168 | unsigned long __initdata table_start, table_end; |
| 169 | |
| 170 | extern pmd_t temp_boot_pmds[]; |
| 171 | |
| 172 | static struct temp_map { |
| 173 | pmd_t *pmd; |
| 174 | void *address; |
| 175 | int allocated; |
| 176 | } temp_mappings[] __initdata = { |
| 177 | { &temp_boot_pmds[0], (void *)(40UL * 1024 * 1024) }, |
| 178 | { &temp_boot_pmds[1], (void *)(42UL * 1024 * 1024) }, |
| 179 | {} |
| 180 | }; |
| 181 | |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 182 | static __meminit void *alloc_low_page(int *index, unsigned long *phys) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | { |
| 184 | struct temp_map *ti; |
| 185 | int i; |
| 186 | unsigned long pfn = table_end++, paddr; |
| 187 | void *adr; |
| 188 | |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 189 | if (after_bootmem) { |
| 190 | adr = (void *)get_zeroed_page(GFP_ATOMIC); |
| 191 | *phys = __pa(adr); |
| 192 | return adr; |
| 193 | } |
| 194 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | if (pfn >= end_pfn) |
| 196 | panic("alloc_low_page: ran out of memory"); |
| 197 | for (i = 0; temp_mappings[i].allocated; i++) { |
| 198 | if (!temp_mappings[i].pmd) |
| 199 | panic("alloc_low_page: ran out of temp mappings"); |
| 200 | } |
| 201 | ti = &temp_mappings[i]; |
| 202 | paddr = (pfn << PAGE_SHIFT) & PMD_MASK; |
| 203 | set_pmd(ti->pmd, __pmd(paddr | _KERNPG_TABLE | _PAGE_PSE)); |
| 204 | ti->allocated = 1; |
| 205 | __flush_tlb(); |
| 206 | adr = ti->address + ((pfn << PAGE_SHIFT) & ~PMD_MASK); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 207 | memset(adr, 0, PAGE_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | *index = i; |
| 209 | *phys = pfn * PAGE_SIZE; |
| 210 | return adr; |
| 211 | } |
| 212 | |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 213 | static __meminit void unmap_low_page(int i) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | { |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 215 | struct temp_map *ti; |
| 216 | |
| 217 | if (after_bootmem) |
| 218 | return; |
| 219 | |
| 220 | ti = &temp_mappings[i]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | set_pmd(ti->pmd, __pmd(0)); |
| 222 | ti->allocated = 0; |
| 223 | } |
| 224 | |
Andi Kleen | f2d3efe | 2006-03-25 16:30:22 +0100 | [diff] [blame] | 225 | /* Must run before zap_low_mappings */ |
| 226 | __init void *early_ioremap(unsigned long addr, unsigned long size) |
| 227 | { |
| 228 | unsigned long map = round_down(addr, LARGE_PAGE_SIZE); |
| 229 | |
| 230 | /* actually usually some more */ |
| 231 | if (size >= LARGE_PAGE_SIZE) { |
| 232 | printk("SMBIOS area too long %lu\n", size); |
| 233 | return NULL; |
| 234 | } |
| 235 | set_pmd(temp_mappings[0].pmd, __pmd(map | _KERNPG_TABLE | _PAGE_PSE)); |
| 236 | map += LARGE_PAGE_SIZE; |
| 237 | set_pmd(temp_mappings[1].pmd, __pmd(map | _KERNPG_TABLE | _PAGE_PSE)); |
| 238 | __flush_tlb(); |
| 239 | return temp_mappings[0].address + (addr & (LARGE_PAGE_SIZE-1)); |
| 240 | } |
| 241 | |
| 242 | /* To avoid virtual aliases later */ |
| 243 | __init void early_iounmap(void *addr, unsigned long size) |
| 244 | { |
| 245 | if ((void *)round_down((unsigned long)addr, LARGE_PAGE_SIZE) != temp_mappings[0].address) |
| 246 | printk("early_iounmap: bad address %p\n", addr); |
| 247 | set_pmd(temp_mappings[0].pmd, __pmd(0)); |
| 248 | set_pmd(temp_mappings[1].pmd, __pmd(0)); |
| 249 | __flush_tlb(); |
| 250 | } |
| 251 | |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 252 | static void __meminit |
| 253 | phys_pmd_init(pmd_t *pmd, unsigned long address, unsigned long end) |
| 254 | { |
| 255 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 257 | for (i = 0; i < PTRS_PER_PMD; pmd++, i++, address += PMD_SIZE) { |
| 258 | unsigned long entry; |
| 259 | |
Jan Beulich | 5f51e13 | 2006-06-26 13:59:02 +0200 | [diff] [blame] | 260 | if (address >= end) { |
| 261 | if (!after_bootmem) |
| 262 | for (; i < PTRS_PER_PMD; i++, pmd++) |
| 263 | set_pmd(pmd, __pmd(0)); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 264 | break; |
| 265 | } |
| 266 | entry = _PAGE_NX|_PAGE_PSE|_KERNPG_TABLE|_PAGE_GLOBAL|address; |
| 267 | entry &= __supported_pte_mask; |
| 268 | set_pmd(pmd, __pmd(entry)); |
| 269 | } |
| 270 | } |
| 271 | |
| 272 | static void __meminit |
| 273 | phys_pmd_update(pud_t *pud, unsigned long address, unsigned long end) |
| 274 | { |
| 275 | pmd_t *pmd = pmd_offset(pud, (unsigned long)__va(address)); |
| 276 | |
| 277 | if (pmd_none(*pmd)) { |
| 278 | spin_lock(&init_mm.page_table_lock); |
| 279 | phys_pmd_init(pmd, address, end); |
| 280 | spin_unlock(&init_mm.page_table_lock); |
| 281 | __flush_tlb_all(); |
| 282 | } |
| 283 | } |
| 284 | |
| 285 | static void __meminit phys_pud_init(pud_t *pud, unsigned long address, unsigned long end) |
| 286 | { |
| 287 | long i = pud_index(address); |
| 288 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | pud = pud + i; |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 290 | |
| 291 | if (after_bootmem && pud_val(*pud)) { |
| 292 | phys_pmd_update(pud, address, end); |
| 293 | return; |
| 294 | } |
| 295 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | for (; i < PTRS_PER_PUD; pud++, i++) { |
| 297 | int map; |
| 298 | unsigned long paddr, pmd_phys; |
| 299 | pmd_t *pmd; |
| 300 | |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 301 | paddr = (address & PGDIR_MASK) + i*PUD_SIZE; |
| 302 | if (paddr >= end) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | |
Arjan van de Ven | eee5a9f | 2006-04-07 19:49:24 +0200 | [diff] [blame] | 305 | if (!after_bootmem && !e820_any_mapped(paddr, paddr+PUD_SIZE, 0)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | set_pud(pud, __pud(0)); |
| 307 | continue; |
| 308 | } |
| 309 | |
| 310 | pmd = alloc_low_page(&map, &pmd_phys); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 311 | spin_lock(&init_mm.page_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | set_pud(pud, __pud(pmd_phys | _KERNPG_TABLE)); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 313 | phys_pmd_init(pmd, paddr, end); |
| 314 | spin_unlock(&init_mm.page_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | unmap_low_page(map); |
| 316 | } |
| 317 | __flush_tlb(); |
| 318 | } |
| 319 | |
| 320 | static void __init find_early_table_space(unsigned long end) |
| 321 | { |
Andi Kleen | 6c5acd1 | 2006-01-11 22:46:57 +0100 | [diff] [blame] | 322 | unsigned long puds, pmds, tables, start; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | |
| 324 | puds = (end + PUD_SIZE - 1) >> PUD_SHIFT; |
| 325 | pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT; |
| 326 | tables = round_up(puds * sizeof(pud_t), PAGE_SIZE) + |
| 327 | round_up(pmds * sizeof(pmd_t), PAGE_SIZE); |
| 328 | |
Andi Kleen | ee408c7 | 2006-01-16 01:56:51 +0100 | [diff] [blame] | 329 | /* RED-PEN putting page tables only on node 0 could |
| 330 | cause a hotspot and fill up ZONE_DMA. The page tables |
| 331 | need roughly 0.5KB per GB. */ |
| 332 | start = 0x8000; |
| 333 | table_start = find_e820_area(start, end, tables); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | if (table_start == -1UL) |
| 335 | panic("Cannot find space for the kernel page tables"); |
| 336 | |
| 337 | table_start >>= PAGE_SHIFT; |
| 338 | table_end = table_start; |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 339 | |
| 340 | early_printk("kernel direct mapping tables up to %lx @ %lx-%lx\n", |
Jan Beulich | 5f51e13 | 2006-06-26 13:59:02 +0200 | [diff] [blame] | 341 | end, table_start << PAGE_SHIFT, |
| 342 | (table_start << PAGE_SHIFT) + tables); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | } |
| 344 | |
| 345 | /* Setup the direct mapping of the physical memory at PAGE_OFFSET. |
| 346 | This runs before bootmem is initialized and gets pages directly from the |
| 347 | physical memory. To access them they are temporarily mapped. */ |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 348 | void __meminit init_memory_mapping(unsigned long start, unsigned long end) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | { |
| 350 | unsigned long next; |
| 351 | |
| 352 | Dprintk("init_memory_mapping\n"); |
| 353 | |
| 354 | /* |
| 355 | * Find space for the kernel direct mapping tables. |
| 356 | * Later we should allocate these tables in the local node of the memory |
| 357 | * mapped. Unfortunately this is done currently before the nodes are |
| 358 | * discovered. |
| 359 | */ |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 360 | if (!after_bootmem) |
| 361 | find_early_table_space(end); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | |
| 363 | start = (unsigned long)__va(start); |
| 364 | end = (unsigned long)__va(end); |
| 365 | |
| 366 | for (; start < end; start = next) { |
| 367 | int map; |
| 368 | unsigned long pud_phys; |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 369 | pgd_t *pgd = pgd_offset_k(start); |
| 370 | pud_t *pud; |
| 371 | |
| 372 | if (after_bootmem) |
Andi Kleen | d2ae5b5 | 2006-06-26 13:57:56 +0200 | [diff] [blame] | 373 | pud = pud_offset(pgd, start & PGDIR_MASK); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 374 | else |
| 375 | pud = alloc_low_page(&map, &pud_phys); |
| 376 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | next = start + PGDIR_SIZE; |
| 378 | if (next > end) |
| 379 | next = end; |
| 380 | phys_pud_init(pud, __pa(start), __pa(next)); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 381 | if (!after_bootmem) |
| 382 | set_pgd(pgd_offset_k(start), mk_kernel_pgd(pud_phys)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | unmap_low_page(map); |
| 384 | } |
| 385 | |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 386 | if (!after_bootmem) |
| 387 | asm volatile("movq %%cr4,%0" : "=r" (mmu_cr4_features)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | __flush_tlb_all(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | } |
| 390 | |
Siddha, Suresh B | f6c2e33 | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 391 | void __cpuinit zap_low_mappings(int cpu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | { |
Siddha, Suresh B | f6c2e33 | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 393 | if (cpu == 0) { |
| 394 | pgd_t *pgd = pgd_offset_k(0UL); |
| 395 | pgd_clear(pgd); |
| 396 | } else { |
| 397 | /* |
| 398 | * For AP's, zap the low identity mappings by changing the cr3 |
| 399 | * to init_level4_pgt and doing local flush tlb all |
| 400 | */ |
| 401 | asm volatile("movq %0,%%cr3" :: "r" (__pa_symbol(&init_level4_pgt))); |
| 402 | } |
| 403 | __flush_tlb_all(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | } |
| 405 | |
Andi Kleen | a2f1b42 | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 406 | /* Compute zone sizes for the DMA and DMA32 zones in a node. */ |
| 407 | __init void |
| 408 | size_zones(unsigned long *z, unsigned long *h, |
| 409 | unsigned long start_pfn, unsigned long end_pfn) |
| 410 | { |
| 411 | int i; |
| 412 | unsigned long w; |
| 413 | |
| 414 | for (i = 0; i < MAX_NR_ZONES; i++) |
| 415 | z[i] = 0; |
| 416 | |
| 417 | if (start_pfn < MAX_DMA_PFN) |
| 418 | z[ZONE_DMA] = MAX_DMA_PFN - start_pfn; |
| 419 | if (start_pfn < MAX_DMA32_PFN) { |
| 420 | unsigned long dma32_pfn = MAX_DMA32_PFN; |
| 421 | if (dma32_pfn > end_pfn) |
| 422 | dma32_pfn = end_pfn; |
| 423 | z[ZONE_DMA32] = dma32_pfn - start_pfn; |
| 424 | } |
| 425 | z[ZONE_NORMAL] = end_pfn - start_pfn; |
| 426 | |
| 427 | /* Remove lower zones from higher ones. */ |
| 428 | w = 0; |
| 429 | for (i = 0; i < MAX_NR_ZONES; i++) { |
| 430 | if (z[i]) |
| 431 | z[i] -= w; |
| 432 | w += z[i]; |
| 433 | } |
| 434 | |
| 435 | /* Compute holes */ |
Ravikiran G Thirumalai | 576fc09 | 2005-12-29 13:06:11 +0100 | [diff] [blame] | 436 | w = start_pfn; |
Andi Kleen | a2f1b42 | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 437 | for (i = 0; i < MAX_NR_ZONES; i++) { |
| 438 | unsigned long s = w; |
| 439 | w += z[i]; |
| 440 | h[i] = e820_hole_size(s, w); |
| 441 | } |
Andi Kleen | e18c687 | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 442 | |
| 443 | /* Add the space pace needed for mem_map to the holes too. */ |
| 444 | for (i = 0; i < MAX_NR_ZONES; i++) |
| 445 | h[i] += (z[i] * sizeof(struct page)) / PAGE_SIZE; |
| 446 | |
| 447 | /* The 16MB DMA zone has the kernel and other misc mappings. |
| 448 | Account them too */ |
| 449 | if (h[ZONE_DMA]) { |
| 450 | h[ZONE_DMA] += dma_reserve; |
| 451 | if (h[ZONE_DMA] >= z[ZONE_DMA]) { |
| 452 | printk(KERN_WARNING |
| 453 | "Kernel too large and filling up ZONE_DMA?\n"); |
| 454 | h[ZONE_DMA] = z[ZONE_DMA]; |
| 455 | } |
| 456 | } |
Andi Kleen | a2f1b42 | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 457 | } |
| 458 | |
Matt Tolentino | 2b97690 | 2005-06-23 00:08:06 -0700 | [diff] [blame] | 459 | #ifndef CONFIG_NUMA |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | void __init paging_init(void) |
| 461 | { |
Andi Kleen | a2f1b42 | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 462 | unsigned long zones[MAX_NR_ZONES], holes[MAX_NR_ZONES]; |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 463 | |
| 464 | memory_present(0, 0, end_pfn); |
| 465 | sparse_init(); |
Andi Kleen | a2f1b42 | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 466 | size_zones(zones, holes, 0, end_pfn); |
| 467 | free_area_init_node(0, NODE_DATA(0), zones, |
| 468 | __pa(PAGE_OFFSET) >> PAGE_SHIFT, holes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | } |
| 470 | #endif |
| 471 | |
| 472 | /* Unmap a kernel mapping if it exists. This is useful to avoid prefetches |
| 473 | from the CPU leading to inconsistent cache lines. address and size |
| 474 | must be aligned to 2MB boundaries. |
| 475 | Does nothing when the mapping doesn't exist. */ |
| 476 | void __init clear_kernel_mapping(unsigned long address, unsigned long size) |
| 477 | { |
| 478 | unsigned long end = address + size; |
| 479 | |
| 480 | BUG_ON(address & ~LARGE_PAGE_MASK); |
| 481 | BUG_ON(size & ~LARGE_PAGE_MASK); |
| 482 | |
| 483 | for (; address < end; address += LARGE_PAGE_SIZE) { |
| 484 | pgd_t *pgd = pgd_offset_k(address); |
| 485 | pud_t *pud; |
| 486 | pmd_t *pmd; |
| 487 | if (pgd_none(*pgd)) |
| 488 | continue; |
| 489 | pud = pud_offset(pgd, address); |
| 490 | if (pud_none(*pud)) |
| 491 | continue; |
| 492 | pmd = pmd_offset(pud, address); |
| 493 | if (!pmd || pmd_none(*pmd)) |
| 494 | continue; |
| 495 | if (0 == (pmd_val(*pmd) & _PAGE_PSE)) { |
| 496 | /* Could handle this, but it should not happen currently. */ |
| 497 | printk(KERN_ERR |
| 498 | "clear_kernel_mapping: mapping has been split. will leak memory\n"); |
| 499 | pmd_ERROR(*pmd); |
| 500 | } |
| 501 | set_pmd(pmd, __pmd(0)); |
| 502 | } |
| 503 | __flush_tlb_all(); |
| 504 | } |
| 505 | |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 506 | /* |
| 507 | * Memory hotplug specific functions |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 508 | */ |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 509 | void online_page(struct page *page) |
| 510 | { |
| 511 | ClearPageReserved(page); |
Nick Piggin | 7835e98 | 2006-03-22 00:08:40 -0800 | [diff] [blame] | 512 | init_page_count(page); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 513 | __free_page(page); |
| 514 | totalram_pages++; |
| 515 | num_physpages++; |
| 516 | } |
| 517 | |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 518 | #ifdef CONFIG_MEMORY_HOTPLUG |
| 519 | /* |
| 520 | * XXX: memory_add_physaddr_to_nid() is to find node id from physical address |
| 521 | * via probe interface of sysfs. If acpi notifies hot-add event, then it |
| 522 | * can tell node id by searching dsdt. But, probe interface doesn't have |
| 523 | * node id. So, return 0 as node id at this time. |
| 524 | */ |
| 525 | #ifdef CONFIG_NUMA |
| 526 | int memory_add_physaddr_to_nid(u64 start) |
| 527 | { |
| 528 | return 0; |
| 529 | } |
| 530 | #endif |
| 531 | |
| 532 | /* |
| 533 | * Memory is added always to NORMAL zone. This means you will never get |
| 534 | * additional DMA/DMA32 memory. |
| 535 | */ |
| 536 | int arch_add_memory(int nid, u64 start, u64 size) |
| 537 | { |
| 538 | struct pglist_data *pgdat = NODE_DATA(nid); |
| 539 | struct zone *zone = pgdat->node_zones + MAX_NR_ZONES-2; |
| 540 | unsigned long start_pfn = start >> PAGE_SHIFT; |
| 541 | unsigned long nr_pages = size >> PAGE_SHIFT; |
| 542 | int ret; |
| 543 | |
| 544 | ret = __add_pages(zone, start_pfn, nr_pages); |
| 545 | if (ret) |
| 546 | goto error; |
| 547 | |
| 548 | init_memory_mapping(start, (start + size -1)); |
| 549 | |
| 550 | return ret; |
| 551 | error: |
| 552 | printk("%s: Problem encountered in __add_pages!\n", __func__); |
| 553 | return ret; |
| 554 | } |
| 555 | EXPORT_SYMBOL_GPL(arch_add_memory); |
| 556 | |
| 557 | int remove_memory(u64 start, u64 size) |
| 558 | { |
| 559 | return -EINVAL; |
| 560 | } |
| 561 | EXPORT_SYMBOL_GPL(remove_memory); |
| 562 | |
| 563 | #else /* CONFIG_MEMORY_HOTPLUG */ |
Andi Kleen | 9d99aaa | 2006-04-07 19:49:15 +0200 | [diff] [blame] | 564 | /* |
| 565 | * Memory Hotadd without sparsemem. The mem_maps have been allocated in advance, |
| 566 | * just online the pages. |
| 567 | */ |
| 568 | int __add_pages(struct zone *z, unsigned long start_pfn, unsigned long nr_pages) |
| 569 | { |
| 570 | int err = -EIO; |
| 571 | unsigned long pfn; |
| 572 | unsigned long total = 0, mem = 0; |
| 573 | for (pfn = start_pfn; pfn < start_pfn + nr_pages; pfn++) { |
Andi Kleen | 68a3a7f | 2006-04-07 19:49:18 +0200 | [diff] [blame] | 574 | if (pfn_valid(pfn)) { |
Andi Kleen | 9d99aaa | 2006-04-07 19:49:15 +0200 | [diff] [blame] | 575 | online_page(pfn_to_page(pfn)); |
| 576 | err = 0; |
| 577 | mem++; |
| 578 | } |
| 579 | total++; |
| 580 | } |
| 581 | if (!err) { |
| 582 | z->spanned_pages += total; |
| 583 | z->present_pages += mem; |
| 584 | z->zone_pgdat->node_spanned_pages += total; |
| 585 | z->zone_pgdat->node_present_pages += mem; |
| 586 | } |
| 587 | return err; |
| 588 | } |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 589 | #endif /* CONFIG_MEMORY_HOTPLUG */ |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 590 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | static struct kcore_list kcore_mem, kcore_vmalloc, kcore_kernel, kcore_modules, |
| 592 | kcore_vsyscall; |
| 593 | |
| 594 | void __init mem_init(void) |
| 595 | { |
Andi Kleen | 0a43e4b | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 596 | long codesize, reservedpages, datasize, initsize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | |
Jon Mason | 0dc243a | 2006-06-26 13:58:11 +0200 | [diff] [blame] | 598 | pci_iommu_alloc(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | |
| 600 | /* How many end-of-memory variables you have, grandma! */ |
| 601 | max_low_pfn = end_pfn; |
| 602 | max_pfn = end_pfn; |
| 603 | num_physpages = end_pfn; |
| 604 | high_memory = (void *) __va(end_pfn * PAGE_SIZE); |
| 605 | |
| 606 | /* clear the zero-page */ |
| 607 | memset(empty_zero_page, 0, PAGE_SIZE); |
| 608 | |
| 609 | reservedpages = 0; |
| 610 | |
| 611 | /* this will put all low memory onto the freelists */ |
Matt Tolentino | 2b97690 | 2005-06-23 00:08:06 -0700 | [diff] [blame] | 612 | #ifdef CONFIG_NUMA |
Andi Kleen | 0a43e4b | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 613 | totalram_pages = numa_free_all_bootmem(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | #else |
Andi Kleen | 0a43e4b | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 615 | totalram_pages = free_all_bootmem(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | #endif |
Andi Kleen | 0a43e4b | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 617 | reservedpages = end_pfn - totalram_pages - e820_hole_size(0, end_pfn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | |
| 619 | after_bootmem = 1; |
| 620 | |
| 621 | codesize = (unsigned long) &_etext - (unsigned long) &_text; |
| 622 | datasize = (unsigned long) &_edata - (unsigned long) &_etext; |
| 623 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; |
| 624 | |
| 625 | /* Register memory areas for /proc/kcore */ |
| 626 | kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT); |
| 627 | kclist_add(&kcore_vmalloc, (void *)VMALLOC_START, |
| 628 | VMALLOC_END-VMALLOC_START); |
| 629 | kclist_add(&kcore_kernel, &_stext, _end - _stext); |
| 630 | kclist_add(&kcore_modules, (void *)MODULES_VADDR, MODULES_LEN); |
| 631 | kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START, |
| 632 | VSYSCALL_END - VSYSCALL_START); |
| 633 | |
Andi Kleen | 0a43e4b | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 634 | printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 635 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), |
| 636 | end_pfn << (PAGE_SHIFT-10), |
| 637 | codesize >> 10, |
| 638 | reservedpages << (PAGE_SHIFT-10), |
| 639 | datasize >> 10, |
| 640 | initsize >> 10); |
| 641 | |
Siddha, Suresh B | f6c2e33 | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 642 | #ifdef CONFIG_SMP |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | /* |
Siddha, Suresh B | f6c2e33 | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 644 | * Sync boot_level4_pgt mappings with the init_level4_pgt |
| 645 | * except for the low identity mappings which are already zapped |
| 646 | * in init_level4_pgt. This sync-up is essential for AP's bringup |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | */ |
Siddha, Suresh B | f6c2e33 | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 648 | memcpy(boot_level4_pgt+1, init_level4_pgt+1, (PTRS_PER_PGD-1)*sizeof(pgd_t)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | #endif |
| 650 | } |
| 651 | |
Gerd Hoffmann | d167a51 | 2006-06-26 13:56:16 +0200 | [diff] [blame] | 652 | void free_init_pages(char *what, unsigned long begin, unsigned long end) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | { |
| 654 | unsigned long addr; |
| 655 | |
Gerd Hoffmann | d167a51 | 2006-06-26 13:56:16 +0200 | [diff] [blame] | 656 | if (begin >= end) |
| 657 | return; |
| 658 | |
| 659 | printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10); |
| 660 | for (addr = begin; addr < end; addr += PAGE_SIZE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | ClearPageReserved(virt_to_page(addr)); |
Nick Piggin | 7835e98 | 2006-03-22 00:08:40 -0800 | [diff] [blame] | 662 | init_page_count(virt_to_page(addr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | memset((void *)(addr & ~(PAGE_SIZE-1)), 0xcc, PAGE_SIZE); |
| 664 | free_page(addr); |
| 665 | totalram_pages++; |
| 666 | } |
Gerd Hoffmann | d167a51 | 2006-06-26 13:56:16 +0200 | [diff] [blame] | 667 | } |
| 668 | |
| 669 | void free_initmem(void) |
| 670 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | memset(__initdata_begin, 0xba, __initdata_end - __initdata_begin); |
Gerd Hoffmann | d167a51 | 2006-06-26 13:56:16 +0200 | [diff] [blame] | 672 | free_init_pages("unused kernel memory", |
| 673 | (unsigned long)(&__init_begin), |
| 674 | (unsigned long)(&__init_end)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | } |
| 676 | |
Arjan van de Ven | 67df197 | 2006-01-06 00:12:04 -0800 | [diff] [blame] | 677 | #ifdef CONFIG_DEBUG_RODATA |
| 678 | |
| 679 | extern char __start_rodata, __end_rodata; |
| 680 | void mark_rodata_ro(void) |
| 681 | { |
| 682 | unsigned long addr = (unsigned long)&__start_rodata; |
| 683 | |
| 684 | for (; addr < (unsigned long)&__end_rodata; addr += PAGE_SIZE) |
| 685 | change_page_attr_addr(addr, 1, PAGE_KERNEL_RO); |
| 686 | |
| 687 | printk ("Write protecting the kernel read-only data: %luk\n", |
| 688 | (&__end_rodata - &__start_rodata) >> 10); |
| 689 | |
| 690 | /* |
| 691 | * change_page_attr_addr() requires a global_flush_tlb() call after it. |
| 692 | * We do this after the printk so that if something went wrong in the |
| 693 | * change, the printk gets out at least to give a better debug hint |
| 694 | * of who is the culprit. |
| 695 | */ |
| 696 | global_flush_tlb(); |
| 697 | } |
| 698 | #endif |
| 699 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | #ifdef CONFIG_BLK_DEV_INITRD |
| 701 | void free_initrd_mem(unsigned long start, unsigned long end) |
| 702 | { |
Gerd Hoffmann | d167a51 | 2006-06-26 13:56:16 +0200 | [diff] [blame] | 703 | free_init_pages("initrd memory", start, end); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | } |
| 705 | #endif |
| 706 | |
| 707 | void __init reserve_bootmem_generic(unsigned long phys, unsigned len) |
| 708 | { |
| 709 | /* Should check here against the e820 map to avoid double free */ |
Matt Tolentino | 2b97690 | 2005-06-23 00:08:06 -0700 | [diff] [blame] | 710 | #ifdef CONFIG_NUMA |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | int nid = phys_to_nid(phys); |
| 712 | reserve_bootmem_node(NODE_DATA(nid), phys, len); |
| 713 | #else |
| 714 | reserve_bootmem(phys, len); |
| 715 | #endif |
Andi Kleen | e18c687 | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 716 | if (phys+len <= MAX_DMA_PFN*PAGE_SIZE) |
| 717 | dma_reserve += len / PAGE_SIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | } |
| 719 | |
| 720 | int kern_addr_valid(unsigned long addr) |
| 721 | { |
| 722 | unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT; |
| 723 | pgd_t *pgd; |
| 724 | pud_t *pud; |
| 725 | pmd_t *pmd; |
| 726 | pte_t *pte; |
| 727 | |
| 728 | if (above != 0 && above != -1UL) |
| 729 | return 0; |
| 730 | |
| 731 | pgd = pgd_offset_k(addr); |
| 732 | if (pgd_none(*pgd)) |
| 733 | return 0; |
| 734 | |
| 735 | pud = pud_offset(pgd, addr); |
| 736 | if (pud_none(*pud)) |
| 737 | return 0; |
| 738 | |
| 739 | pmd = pmd_offset(pud, addr); |
| 740 | if (pmd_none(*pmd)) |
| 741 | return 0; |
| 742 | if (pmd_large(*pmd)) |
| 743 | return pfn_valid(pmd_pfn(*pmd)); |
| 744 | |
| 745 | pte = pte_offset_kernel(pmd, addr); |
| 746 | if (pte_none(*pte)) |
| 747 | return 0; |
| 748 | return pfn_valid(pte_pfn(*pte)); |
| 749 | } |
| 750 | |
| 751 | #ifdef CONFIG_SYSCTL |
| 752 | #include <linux/sysctl.h> |
| 753 | |
| 754 | extern int exception_trace, page_fault_trace; |
| 755 | |
| 756 | static ctl_table debug_table2[] = { |
| 757 | { 99, "exception-trace", &exception_trace, sizeof(int), 0644, NULL, |
| 758 | proc_dointvec }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | { 0, } |
| 760 | }; |
| 761 | |
| 762 | static ctl_table debug_root_table2[] = { |
| 763 | { .ctl_name = CTL_DEBUG, .procname = "debug", .mode = 0555, |
| 764 | .child = debug_table2 }, |
| 765 | { 0 }, |
| 766 | }; |
| 767 | |
| 768 | static __init int x8664_sysctl_init(void) |
| 769 | { |
| 770 | register_sysctl_table(debug_root_table2, 1); |
| 771 | return 0; |
| 772 | } |
| 773 | __initcall(x8664_sysctl_init); |
| 774 | #endif |
| 775 | |
Andi Kleen | 1e01441 | 2005-04-16 15:24:55 -0700 | [diff] [blame] | 776 | /* A pseudo VMAs to allow ptrace access for the vsyscall page. This only |
| 777 | covers the 64bit vsyscall page now. 32bit has a real VMA now and does |
| 778 | not need special handling anymore. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | |
| 780 | static struct vm_area_struct gate_vma = { |
| 781 | .vm_start = VSYSCALL_START, |
| 782 | .vm_end = VSYSCALL_END, |
| 783 | .vm_page_prot = PAGE_READONLY |
| 784 | }; |
| 785 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | struct vm_area_struct *get_gate_vma(struct task_struct *tsk) |
| 787 | { |
| 788 | #ifdef CONFIG_IA32_EMULATION |
Andi Kleen | 1e01441 | 2005-04-16 15:24:55 -0700 | [diff] [blame] | 789 | if (test_tsk_thread_flag(tsk, TIF_IA32)) |
| 790 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 791 | #endif |
| 792 | return &gate_vma; |
| 793 | } |
| 794 | |
| 795 | int in_gate_area(struct task_struct *task, unsigned long addr) |
| 796 | { |
| 797 | struct vm_area_struct *vma = get_gate_vma(task); |
Andi Kleen | 1e01441 | 2005-04-16 15:24:55 -0700 | [diff] [blame] | 798 | if (!vma) |
| 799 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 800 | return (addr >= vma->vm_start) && (addr < vma->vm_end); |
| 801 | } |
| 802 | |
| 803 | /* Use this when you have no reliable task/vma, typically from interrupt |
| 804 | * context. It is less reliable than using the task's vma and may give |
| 805 | * false positives. |
| 806 | */ |
| 807 | int in_gate_area_no_task(unsigned long addr) |
| 808 | { |
Andi Kleen | 1e01441 | 2005-04-16 15:24:55 -0700 | [diff] [blame] | 809 | return (addr >= VSYSCALL_START) && (addr < VSYSCALL_END); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | } |