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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | #include <linux/signal.h> |
| 10 | #include <linux/sched.h> |
| 11 | #include <linux/kernel.h> |
| 12 | #include <linux/errno.h> |
| 13 | #include <linux/string.h> |
| 14 | #include <linux/types.h> |
| 15 | #include <linux/ptrace.h> |
| 16 | #include <linux/mman.h> |
| 17 | #include <linux/mm.h> |
| 18 | #include <linux/swap.h> |
| 19 | #include <linux/smp.h> |
| 20 | #include <linux/init.h> |
| 21 | #include <linux/pagemap.h> |
| 22 | #include <linux/bootmem.h> |
| 23 | #include <linux/proc_fs.h> |
Andi Kleen | 5917089 | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 24 | #include <linux/pci.h> |
Randy Dunlap | c9cf552 | 2006-06-27 02:53:52 -0700 | [diff] [blame] | 25 | #include <linux/poison.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 | |
Stephen Hemminger | e658450 | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 49 | const struct dma_mapping_ops* dma_ops; |
Muli Ben-Yehuda | 17a941d | 2006-01-11 22:44:42 +0100 | [diff] [blame] | 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 | |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 170 | static __meminit void *alloc_low_page(unsigned long *phys) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | { |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 172 | unsigned long pfn = table_end++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | void *adr; |
| 174 | |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 175 | if (after_bootmem) { |
| 176 | adr = (void *)get_zeroed_page(GFP_ATOMIC); |
| 177 | *phys = __pa(adr); |
| 178 | return adr; |
| 179 | } |
| 180 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | if (pfn >= end_pfn) |
| 182 | panic("alloc_low_page: ran out of memory"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 184 | adr = early_ioremap(pfn * PAGE_SIZE, PAGE_SIZE); |
| 185 | memset(adr, 0, PAGE_SIZE); |
| 186 | *phys = pfn * PAGE_SIZE; |
| 187 | return adr; |
| 188 | } |
| 189 | |
| 190 | static __meminit void unmap_low_page(void *adr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | { |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 192 | |
| 193 | if (after_bootmem) |
| 194 | return; |
| 195 | |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 196 | early_iounmap(adr, PAGE_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | } |
| 198 | |
Andi Kleen | f2d3efe | 2006-03-25 16:30:22 +0100 | [diff] [blame] | 199 | /* Must run before zap_low_mappings */ |
| 200 | __init void *early_ioremap(unsigned long addr, unsigned long size) |
| 201 | { |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 202 | unsigned long vaddr; |
| 203 | pmd_t *pmd, *last_pmd; |
| 204 | int i, pmds; |
Andi Kleen | f2d3efe | 2006-03-25 16:30:22 +0100 | [diff] [blame] | 205 | |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 206 | pmds = ((addr & ~PMD_MASK) + size + ~PMD_MASK) / PMD_SIZE; |
| 207 | vaddr = __START_KERNEL_map; |
| 208 | pmd = level2_kernel_pgt; |
| 209 | last_pmd = level2_kernel_pgt + PTRS_PER_PMD - 1; |
| 210 | for (; pmd <= last_pmd; pmd++, vaddr += PMD_SIZE) { |
| 211 | for (i = 0; i < pmds; i++) { |
| 212 | if (pmd_present(pmd[i])) |
| 213 | goto next; |
| 214 | } |
| 215 | vaddr += addr & ~PMD_MASK; |
| 216 | addr &= PMD_MASK; |
| 217 | for (i = 0; i < pmds; i++, addr += PMD_SIZE) |
| 218 | set_pmd(pmd + i,__pmd(addr | _KERNPG_TABLE | _PAGE_PSE)); |
| 219 | __flush_tlb(); |
| 220 | return (void *)vaddr; |
| 221 | next: |
| 222 | ; |
Andi Kleen | f2d3efe | 2006-03-25 16:30:22 +0100 | [diff] [blame] | 223 | } |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 224 | printk("early_ioremap(0x%lx, %lu) failed\n", addr, size); |
| 225 | return NULL; |
Andi Kleen | f2d3efe | 2006-03-25 16:30:22 +0100 | [diff] [blame] | 226 | } |
| 227 | |
| 228 | /* To avoid virtual aliases later */ |
| 229 | __init void early_iounmap(void *addr, unsigned long size) |
| 230 | { |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 231 | unsigned long vaddr; |
| 232 | pmd_t *pmd; |
| 233 | int i, pmds; |
| 234 | |
| 235 | vaddr = (unsigned long)addr; |
| 236 | pmds = ((vaddr & ~PMD_MASK) + size + ~PMD_MASK) / PMD_SIZE; |
| 237 | pmd = level2_kernel_pgt + pmd_index(vaddr); |
| 238 | for (i = 0; i < pmds; i++) |
| 239 | pmd_clear(pmd + i); |
Andi Kleen | f2d3efe | 2006-03-25 16:30:22 +0100 | [diff] [blame] | 240 | __flush_tlb(); |
| 241 | } |
| 242 | |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 243 | static void __meminit |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 244 | phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end) |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 245 | { |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 246 | int i = pmd_index(address); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 248 | for (; i < PTRS_PER_PMD; i++, address += PMD_SIZE) { |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 249 | unsigned long entry; |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 250 | pmd_t *pmd = pmd_page + pmd_index(address); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 251 | |
Jan Beulich | 5f51e13 | 2006-06-26 13:59:02 +0200 | [diff] [blame] | 252 | if (address >= end) { |
| 253 | if (!after_bootmem) |
| 254 | for (; i < PTRS_PER_PMD; i++, pmd++) |
| 255 | set_pmd(pmd, __pmd(0)); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 256 | break; |
| 257 | } |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 258 | |
| 259 | if (pmd_val(*pmd)) |
| 260 | continue; |
| 261 | |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 262 | entry = _PAGE_NX|_PAGE_PSE|_KERNPG_TABLE|_PAGE_GLOBAL|address; |
| 263 | entry &= __supported_pte_mask; |
| 264 | set_pmd(pmd, __pmd(entry)); |
| 265 | } |
| 266 | } |
| 267 | |
| 268 | static void __meminit |
| 269 | phys_pmd_update(pud_t *pud, unsigned long address, unsigned long end) |
| 270 | { |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 271 | pmd_t *pmd = pmd_offset(pud,0); |
| 272 | spin_lock(&init_mm.page_table_lock); |
| 273 | phys_pmd_init(pmd, address, end); |
| 274 | spin_unlock(&init_mm.page_table_lock); |
| 275 | __flush_tlb_all(); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 276 | } |
| 277 | |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 278 | static void __meminit phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end) |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 279 | { |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 280 | int i = pud_index(addr); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 281 | |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 282 | |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 283 | for (; i < PTRS_PER_PUD; i++, addr = (addr & PUD_MASK) + PUD_SIZE ) { |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 284 | unsigned long pmd_phys; |
| 285 | pud_t *pud = pud_page + pud_index(addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | pmd_t *pmd; |
| 287 | |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 288 | if (addr >= end) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 291 | if (!after_bootmem && !e820_any_mapped(addr,addr+PUD_SIZE,0)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | set_pud(pud, __pud(0)); |
| 293 | continue; |
| 294 | } |
| 295 | |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 296 | if (pud_val(*pud)) { |
| 297 | phys_pmd_update(pud, addr, end); |
| 298 | continue; |
| 299 | } |
| 300 | |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 301 | pmd = alloc_low_page(&pmd_phys); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 302 | spin_lock(&init_mm.page_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | set_pud(pud, __pud(pmd_phys | _KERNPG_TABLE)); |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 304 | phys_pmd_init(pmd, addr, end); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 305 | spin_unlock(&init_mm.page_table_lock); |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 306 | unmap_low_page(pmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | } |
| 308 | __flush_tlb(); |
| 309 | } |
| 310 | |
| 311 | static void __init find_early_table_space(unsigned long end) |
| 312 | { |
Andi Kleen | 6c5acd1 | 2006-01-11 22:46:57 +0100 | [diff] [blame] | 313 | unsigned long puds, pmds, tables, start; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | |
| 315 | puds = (end + PUD_SIZE - 1) >> PUD_SHIFT; |
| 316 | pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT; |
| 317 | tables = round_up(puds * sizeof(pud_t), PAGE_SIZE) + |
| 318 | round_up(pmds * sizeof(pmd_t), PAGE_SIZE); |
| 319 | |
Andi Kleen | ee408c7 | 2006-01-16 01:56:51 +0100 | [diff] [blame] | 320 | /* RED-PEN putting page tables only on node 0 could |
| 321 | cause a hotspot and fill up ZONE_DMA. The page tables |
| 322 | need roughly 0.5KB per GB. */ |
| 323 | start = 0x8000; |
| 324 | table_start = find_e820_area(start, end, tables); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | if (table_start == -1UL) |
| 326 | panic("Cannot find space for the kernel page tables"); |
| 327 | |
| 328 | table_start >>= PAGE_SHIFT; |
| 329 | table_end = table_start; |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 330 | |
| 331 | early_printk("kernel direct mapping tables up to %lx @ %lx-%lx\n", |
Jan Beulich | 5f51e13 | 2006-06-26 13:59:02 +0200 | [diff] [blame] | 332 | end, table_start << PAGE_SHIFT, |
| 333 | (table_start << PAGE_SHIFT) + tables); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | } |
| 335 | |
| 336 | /* Setup the direct mapping of the physical memory at PAGE_OFFSET. |
| 337 | This runs before bootmem is initialized and gets pages directly from the |
| 338 | physical memory. To access them they are temporarily mapped. */ |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 339 | void __meminit init_memory_mapping(unsigned long start, unsigned long end) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | { |
| 341 | unsigned long next; |
| 342 | |
| 343 | Dprintk("init_memory_mapping\n"); |
| 344 | |
| 345 | /* |
| 346 | * Find space for the kernel direct mapping tables. |
| 347 | * Later we should allocate these tables in the local node of the memory |
| 348 | * mapped. Unfortunately this is done currently before the nodes are |
| 349 | * discovered. |
| 350 | */ |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 351 | if (!after_bootmem) |
| 352 | find_early_table_space(end); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | |
| 354 | start = (unsigned long)__va(start); |
| 355 | end = (unsigned long)__va(end); |
| 356 | |
| 357 | for (; start < end; start = next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | unsigned long pud_phys; |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 359 | pgd_t *pgd = pgd_offset_k(start); |
| 360 | pud_t *pud; |
| 361 | |
| 362 | if (after_bootmem) |
Andi Kleen | d2ae5b5 | 2006-06-26 13:57:56 +0200 | [diff] [blame] | 363 | pud = pud_offset(pgd, start & PGDIR_MASK); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 364 | else |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 365 | pud = alloc_low_page(&pud_phys); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 366 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | next = start + PGDIR_SIZE; |
| 368 | if (next > end) |
| 369 | next = end; |
| 370 | phys_pud_init(pud, __pa(start), __pa(next)); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 371 | if (!after_bootmem) |
| 372 | set_pgd(pgd_offset_k(start), mk_kernel_pgd(pud_phys)); |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 373 | unmap_low_page(pud); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | } |
| 375 | |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 376 | if (!after_bootmem) |
| 377 | asm volatile("movq %%cr4,%0" : "=r" (mmu_cr4_features)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | __flush_tlb_all(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | } |
| 380 | |
Matt Tolentino | 2b97690 | 2005-06-23 00:08:06 -0700 | [diff] [blame] | 381 | #ifndef CONFIG_NUMA |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | void __init paging_init(void) |
| 383 | { |
Mel Gorman | 6391af1 | 2006-10-11 01:20:39 -0700 | [diff] [blame] | 384 | unsigned long max_zone_pfns[MAX_NR_ZONES]; |
| 385 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); |
| 386 | max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN; |
| 387 | max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN; |
| 388 | max_zone_pfns[ZONE_NORMAL] = end_pfn; |
| 389 | |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 390 | memory_present(0, 0, end_pfn); |
| 391 | sparse_init(); |
Mel Gorman | 5cb248a | 2006-09-27 01:49:52 -0700 | [diff] [blame] | 392 | free_area_init_nodes(max_zone_pfns); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | } |
| 394 | #endif |
| 395 | |
| 396 | /* Unmap a kernel mapping if it exists. This is useful to avoid prefetches |
| 397 | from the CPU leading to inconsistent cache lines. address and size |
| 398 | must be aligned to 2MB boundaries. |
| 399 | Does nothing when the mapping doesn't exist. */ |
| 400 | void __init clear_kernel_mapping(unsigned long address, unsigned long size) |
| 401 | { |
| 402 | unsigned long end = address + size; |
| 403 | |
| 404 | BUG_ON(address & ~LARGE_PAGE_MASK); |
| 405 | BUG_ON(size & ~LARGE_PAGE_MASK); |
| 406 | |
| 407 | for (; address < end; address += LARGE_PAGE_SIZE) { |
| 408 | pgd_t *pgd = pgd_offset_k(address); |
| 409 | pud_t *pud; |
| 410 | pmd_t *pmd; |
| 411 | if (pgd_none(*pgd)) |
| 412 | continue; |
| 413 | pud = pud_offset(pgd, address); |
| 414 | if (pud_none(*pud)) |
| 415 | continue; |
| 416 | pmd = pmd_offset(pud, address); |
| 417 | if (!pmd || pmd_none(*pmd)) |
| 418 | continue; |
| 419 | if (0 == (pmd_val(*pmd) & _PAGE_PSE)) { |
| 420 | /* Could handle this, but it should not happen currently. */ |
| 421 | printk(KERN_ERR |
| 422 | "clear_kernel_mapping: mapping has been split. will leak memory\n"); |
| 423 | pmd_ERROR(*pmd); |
| 424 | } |
| 425 | set_pmd(pmd, __pmd(0)); |
| 426 | } |
| 427 | __flush_tlb_all(); |
| 428 | } |
| 429 | |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 430 | /* |
| 431 | * Memory hotplug specific functions |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 432 | */ |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 433 | void online_page(struct page *page) |
| 434 | { |
| 435 | ClearPageReserved(page); |
Nick Piggin | 7835e98 | 2006-03-22 00:08:40 -0800 | [diff] [blame] | 436 | init_page_count(page); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 437 | __free_page(page); |
| 438 | totalram_pages++; |
| 439 | num_physpages++; |
| 440 | } |
| 441 | |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 442 | #ifdef CONFIG_MEMORY_HOTPLUG |
| 443 | /* |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 444 | * Memory is added always to NORMAL zone. This means you will never get |
| 445 | * additional DMA/DMA32 memory. |
| 446 | */ |
| 447 | int arch_add_memory(int nid, u64 start, u64 size) |
| 448 | { |
| 449 | struct pglist_data *pgdat = NODE_DATA(nid); |
Christoph Lameter | 776ed98 | 2006-09-25 23:31:09 -0700 | [diff] [blame] | 450 | struct zone *zone = pgdat->node_zones + ZONE_NORMAL; |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 451 | unsigned long start_pfn = start >> PAGE_SHIFT; |
| 452 | unsigned long nr_pages = size >> PAGE_SHIFT; |
| 453 | int ret; |
| 454 | |
Keith Mannthey | 45e0b78 | 2006-09-30 23:27:09 -0700 | [diff] [blame] | 455 | init_memory_mapping(start, (start + size -1)); |
| 456 | |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 457 | ret = __add_pages(zone, start_pfn, nr_pages); |
| 458 | if (ret) |
| 459 | goto error; |
| 460 | |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 461 | return ret; |
| 462 | error: |
| 463 | printk("%s: Problem encountered in __add_pages!\n", __func__); |
| 464 | return ret; |
| 465 | } |
| 466 | EXPORT_SYMBOL_GPL(arch_add_memory); |
| 467 | |
| 468 | int remove_memory(u64 start, u64 size) |
| 469 | { |
| 470 | return -EINVAL; |
| 471 | } |
| 472 | EXPORT_SYMBOL_GPL(remove_memory); |
| 473 | |
Yasunori Goto | 8243229 | 2006-11-18 22:19:40 -0800 | [diff] [blame] | 474 | #if !defined(CONFIG_ACPI_NUMA) && defined(CONFIG_NUMA) |
Keith Mannthey | 4942e99 | 2006-09-30 23:27:06 -0700 | [diff] [blame] | 475 | int memory_add_physaddr_to_nid(u64 start) |
| 476 | { |
| 477 | return 0; |
| 478 | } |
Keith Mannthey | 8c2676a | 2006-09-30 23:27:07 -0700 | [diff] [blame] | 479 | EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid); |
Keith Mannthey | 4942e99 | 2006-09-30 23:27:06 -0700 | [diff] [blame] | 480 | #endif |
| 481 | |
Keith Mannthey | 45e0b78 | 2006-09-30 23:27:09 -0700 | [diff] [blame] | 482 | #endif /* CONFIG_MEMORY_HOTPLUG */ |
| 483 | |
| 484 | #ifdef CONFIG_MEMORY_HOTPLUG_RESERVE |
Andi Kleen | 9d99aaa | 2006-04-07 19:49:15 +0200 | [diff] [blame] | 485 | /* |
| 486 | * Memory Hotadd without sparsemem. The mem_maps have been allocated in advance, |
| 487 | * just online the pages. |
| 488 | */ |
| 489 | int __add_pages(struct zone *z, unsigned long start_pfn, unsigned long nr_pages) |
| 490 | { |
| 491 | int err = -EIO; |
| 492 | unsigned long pfn; |
| 493 | unsigned long total = 0, mem = 0; |
| 494 | for (pfn = start_pfn; pfn < start_pfn + nr_pages; pfn++) { |
Andi Kleen | 68a3a7f | 2006-04-07 19:49:18 +0200 | [diff] [blame] | 495 | if (pfn_valid(pfn)) { |
Andi Kleen | 9d99aaa | 2006-04-07 19:49:15 +0200 | [diff] [blame] | 496 | online_page(pfn_to_page(pfn)); |
| 497 | err = 0; |
| 498 | mem++; |
| 499 | } |
| 500 | total++; |
| 501 | } |
| 502 | if (!err) { |
| 503 | z->spanned_pages += total; |
| 504 | z->present_pages += mem; |
| 505 | z->zone_pgdat->node_spanned_pages += total; |
| 506 | z->zone_pgdat->node_present_pages += mem; |
| 507 | } |
| 508 | return err; |
| 509 | } |
Keith Mannthey | 45e0b78 | 2006-09-30 23:27:09 -0700 | [diff] [blame] | 510 | #endif |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 511 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | static struct kcore_list kcore_mem, kcore_vmalloc, kcore_kernel, kcore_modules, |
| 513 | kcore_vsyscall; |
| 514 | |
| 515 | void __init mem_init(void) |
| 516 | { |
Andi Kleen | 0a43e4b | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 517 | long codesize, reservedpages, datasize, initsize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | |
Jon Mason | 0dc243a | 2006-06-26 13:58:11 +0200 | [diff] [blame] | 519 | pci_iommu_alloc(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | /* clear the zero-page */ |
| 522 | memset(empty_zero_page, 0, PAGE_SIZE); |
| 523 | |
| 524 | reservedpages = 0; |
| 525 | |
| 526 | /* this will put all low memory onto the freelists */ |
Matt Tolentino | 2b97690 | 2005-06-23 00:08:06 -0700 | [diff] [blame] | 527 | #ifdef CONFIG_NUMA |
Andi Kleen | 0a43e4b | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 528 | totalram_pages = numa_free_all_bootmem(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | #else |
Andi Kleen | 0a43e4b | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 530 | totalram_pages = free_all_bootmem(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | #endif |
Mel Gorman | 5cb248a | 2006-09-27 01:49:52 -0700 | [diff] [blame] | 532 | reservedpages = end_pfn - totalram_pages - |
| 533 | absent_pages_in_range(0, end_pfn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | |
| 535 | after_bootmem = 1; |
| 536 | |
| 537 | codesize = (unsigned long) &_etext - (unsigned long) &_text; |
| 538 | datasize = (unsigned long) &_edata - (unsigned long) &_etext; |
| 539 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; |
| 540 | |
| 541 | /* Register memory areas for /proc/kcore */ |
| 542 | kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT); |
| 543 | kclist_add(&kcore_vmalloc, (void *)VMALLOC_START, |
| 544 | VMALLOC_END-VMALLOC_START); |
| 545 | kclist_add(&kcore_kernel, &_stext, _end - _stext); |
| 546 | kclist_add(&kcore_modules, (void *)MODULES_VADDR, MODULES_LEN); |
| 547 | kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START, |
| 548 | VSYSCALL_END - VSYSCALL_START); |
| 549 | |
Andi Kleen | 0a43e4b | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 550 | 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] | 551 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), |
| 552 | end_pfn << (PAGE_SHIFT-10), |
| 553 | codesize >> 10, |
| 554 | reservedpages << (PAGE_SHIFT-10), |
| 555 | datasize >> 10, |
| 556 | initsize >> 10); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | } |
| 558 | |
Gerd Hoffmann | d167a51 | 2006-06-26 13:56:16 +0200 | [diff] [blame] | 559 | void free_init_pages(char *what, unsigned long begin, unsigned long end) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | { |
| 561 | unsigned long addr; |
| 562 | |
Gerd Hoffmann | d167a51 | 2006-06-26 13:56:16 +0200 | [diff] [blame] | 563 | if (begin >= end) |
| 564 | return; |
| 565 | |
| 566 | printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10); |
| 567 | for (addr = begin; addr < end; addr += PAGE_SIZE) { |
Vivek Goyal | 0dbf702 | 2007-05-02 19:27:07 +0200 | [diff] [blame] | 568 | struct page *page = pfn_to_page(addr >> PAGE_SHIFT); |
| 569 | ClearPageReserved(page); |
| 570 | init_page_count(page); |
| 571 | memset(page_address(page), POISON_FREE_INITMEM, PAGE_SIZE); |
| 572 | __free_page(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | totalram_pages++; |
| 574 | } |
Gerd Hoffmann | d167a51 | 2006-06-26 13:56:16 +0200 | [diff] [blame] | 575 | } |
| 576 | |
| 577 | void free_initmem(void) |
| 578 | { |
Randy Dunlap | c9cf552 | 2006-06-27 02:53:52 -0700 | [diff] [blame] | 579 | memset(__initdata_begin, POISON_FREE_INITDATA, |
| 580 | __initdata_end - __initdata_begin); |
Gerd Hoffmann | d167a51 | 2006-06-26 13:56:16 +0200 | [diff] [blame] | 581 | free_init_pages("unused kernel memory", |
Vivek Goyal | 0dbf702 | 2007-05-02 19:27:07 +0200 | [diff] [blame] | 582 | __pa_symbol(&__init_begin), |
| 583 | __pa_symbol(&__init_end)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | } |
| 585 | |
Arjan van de Ven | 67df197 | 2006-01-06 00:12:04 -0800 | [diff] [blame] | 586 | #ifdef CONFIG_DEBUG_RODATA |
| 587 | |
Arjan van de Ven | 67df197 | 2006-01-06 00:12:04 -0800 | [diff] [blame] | 588 | void mark_rodata_ro(void) |
| 589 | { |
Vivek Goyal | 0dbf702 | 2007-05-02 19:27:07 +0200 | [diff] [blame] | 590 | unsigned long addr = (unsigned long)__va(__pa_symbol(&__start_rodata)); |
| 591 | unsigned long end = (unsigned long)__va(__pa_symbol(&__end_rodata)); |
Arjan van de Ven | 67df197 | 2006-01-06 00:12:04 -0800 | [diff] [blame] | 592 | |
Vivek Goyal | 0dbf702 | 2007-05-02 19:27:07 +0200 | [diff] [blame] | 593 | for (; addr < end; addr += PAGE_SIZE) |
Arjan van de Ven | 67df197 | 2006-01-06 00:12:04 -0800 | [diff] [blame] | 594 | change_page_attr_addr(addr, 1, PAGE_KERNEL_RO); |
| 595 | |
| 596 | printk ("Write protecting the kernel read-only data: %luk\n", |
Heiko Carstens | a581c2a | 2006-07-01 04:36:30 -0700 | [diff] [blame] | 597 | (__end_rodata - __start_rodata) >> 10); |
Arjan van de Ven | 67df197 | 2006-01-06 00:12:04 -0800 | [diff] [blame] | 598 | |
| 599 | /* |
| 600 | * change_page_attr_addr() requires a global_flush_tlb() call after it. |
| 601 | * We do this after the printk so that if something went wrong in the |
| 602 | * change, the printk gets out at least to give a better debug hint |
| 603 | * of who is the culprit. |
| 604 | */ |
| 605 | global_flush_tlb(); |
| 606 | } |
| 607 | #endif |
| 608 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | #ifdef CONFIG_BLK_DEV_INITRD |
| 610 | void free_initrd_mem(unsigned long start, unsigned long end) |
| 611 | { |
Vivek Goyal | 0dbf702 | 2007-05-02 19:27:07 +0200 | [diff] [blame] | 612 | free_init_pages("initrd memory", __pa(start), __pa(end)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | } |
| 614 | #endif |
| 615 | |
| 616 | void __init reserve_bootmem_generic(unsigned long phys, unsigned len) |
| 617 | { |
Matt Tolentino | 2b97690 | 2005-06-23 00:08:06 -0700 | [diff] [blame] | 618 | #ifdef CONFIG_NUMA |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | int nid = phys_to_nid(phys); |
Andi Kleen | 5e58a02 | 2006-11-14 16:57:46 +0100 | [diff] [blame] | 620 | #endif |
| 621 | unsigned long pfn = phys >> PAGE_SHIFT; |
| 622 | if (pfn >= end_pfn) { |
| 623 | /* This can happen with kdump kernels when accessing firmware |
| 624 | tables. */ |
| 625 | if (pfn < end_pfn_map) |
| 626 | return; |
| 627 | printk(KERN_ERR "reserve_bootmem: illegal reserve %lx %u\n", |
| 628 | phys, len); |
| 629 | return; |
| 630 | } |
| 631 | |
| 632 | /* Should check here against the e820 map to avoid double free */ |
| 633 | #ifdef CONFIG_NUMA |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | reserve_bootmem_node(NODE_DATA(nid), phys, len); |
| 635 | #else |
| 636 | reserve_bootmem(phys, len); |
| 637 | #endif |
Mel Gorman | 0e0b864 | 2006-09-27 01:49:56 -0700 | [diff] [blame] | 638 | if (phys+len <= MAX_DMA_PFN*PAGE_SIZE) { |
Andi Kleen | e18c687 | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 639 | dma_reserve += len / PAGE_SIZE; |
Mel Gorman | 0e0b864 | 2006-09-27 01:49:56 -0700 | [diff] [blame] | 640 | set_dma_reserve(dma_reserve); |
| 641 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | } |
| 643 | |
| 644 | int kern_addr_valid(unsigned long addr) |
| 645 | { |
| 646 | unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT; |
| 647 | pgd_t *pgd; |
| 648 | pud_t *pud; |
| 649 | pmd_t *pmd; |
| 650 | pte_t *pte; |
| 651 | |
| 652 | if (above != 0 && above != -1UL) |
| 653 | return 0; |
| 654 | |
| 655 | pgd = pgd_offset_k(addr); |
| 656 | if (pgd_none(*pgd)) |
| 657 | return 0; |
| 658 | |
| 659 | pud = pud_offset(pgd, addr); |
| 660 | if (pud_none(*pud)) |
| 661 | return 0; |
| 662 | |
| 663 | pmd = pmd_offset(pud, addr); |
| 664 | if (pmd_none(*pmd)) |
| 665 | return 0; |
| 666 | if (pmd_large(*pmd)) |
| 667 | return pfn_valid(pmd_pfn(*pmd)); |
| 668 | |
| 669 | pte = pte_offset_kernel(pmd, addr); |
| 670 | if (pte_none(*pte)) |
| 671 | return 0; |
| 672 | return pfn_valid(pte_pfn(*pte)); |
| 673 | } |
| 674 | |
| 675 | #ifdef CONFIG_SYSCTL |
| 676 | #include <linux/sysctl.h> |
| 677 | |
| 678 | extern int exception_trace, page_fault_trace; |
| 679 | |
| 680 | static ctl_table debug_table2[] = { |
Eric W. Biederman | c37ce03 | 2007-02-14 00:33:51 -0800 | [diff] [blame] | 681 | { |
| 682 | .ctl_name = 99, |
| 683 | .procname = "exception-trace", |
| 684 | .data = &exception_trace, |
| 685 | .maxlen = sizeof(int), |
| 686 | .mode = 0644, |
| 687 | .proc_handler = proc_dointvec |
| 688 | }, |
| 689 | {} |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | }; |
| 691 | |
| 692 | static ctl_table debug_root_table2[] = { |
Eric W. Biederman | c37ce03 | 2007-02-14 00:33:51 -0800 | [diff] [blame] | 693 | { |
| 694 | .ctl_name = CTL_DEBUG, |
| 695 | .procname = "debug", |
| 696 | .mode = 0555, |
| 697 | .child = debug_table2 |
| 698 | }, |
| 699 | {} |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | }; |
| 701 | |
| 702 | static __init int x8664_sysctl_init(void) |
| 703 | { |
Eric W. Biederman | 0b4d414 | 2007-02-14 00:34:09 -0800 | [diff] [blame] | 704 | register_sysctl_table(debug_root_table2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | return 0; |
| 706 | } |
| 707 | __initcall(x8664_sysctl_init); |
| 708 | #endif |
| 709 | |
Ernie Petrides | 103efcd | 2006-12-07 02:14:09 +0100 | [diff] [blame] | 710 | /* A pseudo VMA to allow ptrace access for the vsyscall page. This only |
Andi Kleen | 1e01441 | 2005-04-16 15:24:55 -0700 | [diff] [blame] | 711 | covers the 64bit vsyscall page now. 32bit has a real VMA now and does |
| 712 | not need special handling anymore. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | |
| 714 | static struct vm_area_struct gate_vma = { |
| 715 | .vm_start = VSYSCALL_START, |
Ernie Petrides | 103efcd | 2006-12-07 02:14:09 +0100 | [diff] [blame] | 716 | .vm_end = VSYSCALL_START + (VSYSCALL_MAPPED_PAGES << PAGE_SHIFT), |
| 717 | .vm_page_prot = PAGE_READONLY_EXEC, |
| 718 | .vm_flags = VM_READ | VM_EXEC |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | }; |
| 720 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | struct vm_area_struct *get_gate_vma(struct task_struct *tsk) |
| 722 | { |
| 723 | #ifdef CONFIG_IA32_EMULATION |
Andi Kleen | 1e01441 | 2005-04-16 15:24:55 -0700 | [diff] [blame] | 724 | if (test_tsk_thread_flag(tsk, TIF_IA32)) |
| 725 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | #endif |
| 727 | return &gate_vma; |
| 728 | } |
| 729 | |
| 730 | int in_gate_area(struct task_struct *task, unsigned long addr) |
| 731 | { |
| 732 | struct vm_area_struct *vma = get_gate_vma(task); |
Andi Kleen | 1e01441 | 2005-04-16 15:24:55 -0700 | [diff] [blame] | 733 | if (!vma) |
| 734 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | return (addr >= vma->vm_start) && (addr < vma->vm_end); |
| 736 | } |
| 737 | |
| 738 | /* Use this when you have no reliable task/vma, typically from interrupt |
| 739 | * context. It is less reliable than using the task's vma and may give |
| 740 | * false positives. |
| 741 | */ |
| 742 | int in_gate_area_no_task(unsigned long addr) |
| 743 | { |
Andi Kleen | 1e01441 | 2005-04-16 15:24:55 -0700 | [diff] [blame] | 744 | return (addr >= VSYSCALL_START) && (addr < VSYSCALL_END); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | } |