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> |
Thomas Gleixner | 11034d5 | 2008-05-12 15:43:36 +0200 | [diff] [blame] | 21 | #include <linux/initrd.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Jan Beulich | 6fb1475 | 2007-05-02 19:27:10 +0200 | [diff] [blame] | 26 | #include <linux/pfn.h> |
Randy Dunlap | c9cf552 | 2006-06-27 02:53:52 -0700 | [diff] [blame] | 27 | #include <linux/poison.h> |
Muli Ben-Yehuda | 17a941d | 2006-01-11 22:44:42 +0100 | [diff] [blame] | 28 | #include <linux/dma-mapping.h> |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 29 | #include <linux/module.h> |
| 30 | #include <linux/memory_hotplug.h> |
Konrad Rzeszutek | ae32b12 | 2007-05-02 19:27:11 +0200 | [diff] [blame] | 31 | #include <linux/nmi.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | |
| 33 | #include <asm/processor.h> |
Ingo Molnar | 46eaa67 | 2008-10-12 15:06:29 +0200 | [diff] [blame] | 34 | #include <asm/bios_ebda.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include <asm/system.h> |
| 36 | #include <asm/uaccess.h> |
| 37 | #include <asm/pgtable.h> |
| 38 | #include <asm/pgalloc.h> |
| 39 | #include <asm/dma.h> |
| 40 | #include <asm/fixmap.h> |
| 41 | #include <asm/e820.h> |
| 42 | #include <asm/apic.h> |
| 43 | #include <asm/tlb.h> |
| 44 | #include <asm/mmu_context.h> |
| 45 | #include <asm/proto.h> |
| 46 | #include <asm/smp.h> |
Andi Kleen | 2bc0414 | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 47 | #include <asm/sections.h> |
Thomas Gleixner | 718fc13 | 2008-01-30 13:30:17 +0100 | [diff] [blame] | 48 | #include <asm/kdebug.h> |
Thomas Gleixner | aaa64e0 | 2008-01-30 13:30:17 +0100 | [diff] [blame] | 49 | #include <asm/numa.h> |
Harvey Harrison | 7bfeab9 | 2008-02-12 12:12:01 -0800 | [diff] [blame] | 50 | #include <asm/cacheflush.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | |
Yinghai Lu | 064d25f | 2008-06-16 19:58:28 -0700 | [diff] [blame] | 52 | /* |
Yinghai Lu | 064d25f | 2008-06-16 19:58:28 -0700 | [diff] [blame] | 53 | * end_pfn only includes RAM, while max_pfn_mapped includes all e820 entries. |
| 54 | * The direct mapping extends to max_pfn_mapped, so that we can directly access |
| 55 | * apertures, ACPI and other tables without having to play with fixmaps. |
| 56 | */ |
Yinghai Lu | f361a45 | 2008-07-10 20:38:26 -0700 | [diff] [blame] | 57 | unsigned long max_low_pfn_mapped; |
Yinghai Lu | 064d25f | 2008-06-16 19:58:28 -0700 | [diff] [blame] | 58 | unsigned long max_pfn_mapped; |
| 59 | |
Andi Kleen | e18c687 | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 60 | static unsigned long dma_reserve __initdata; |
| 61 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); |
| 63 | |
Hugh Dickins | a06de63 | 2008-08-15 13:58:32 +0100 | [diff] [blame] | 64 | int direct_gbpages |
Ingo Molnar | 00d1c5e | 2008-04-17 17:40:45 +0200 | [diff] [blame] | 65 | #ifdef CONFIG_DIRECT_GBPAGES |
| 66 | = 1 |
| 67 | #endif |
| 68 | ; |
| 69 | |
| 70 | static int __init parse_direct_gbpages_off(char *arg) |
| 71 | { |
| 72 | direct_gbpages = 0; |
| 73 | return 0; |
| 74 | } |
| 75 | early_param("nogbpages", parse_direct_gbpages_off); |
| 76 | |
| 77 | static int __init parse_direct_gbpages_on(char *arg) |
| 78 | { |
| 79 | direct_gbpages = 1; |
| 80 | return 0; |
| 81 | } |
| 82 | early_param("gbpages", parse_direct_gbpages_on); |
| 83 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | /* |
| 85 | * NOTE: pagetable_init alloc all the fixmap pagetables contiguous on the |
| 86 | * physical space so we can cache the place of the first one and move |
| 87 | * around without checking the pgd every time. |
| 88 | */ |
| 89 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | int after_bootmem; |
| 91 | |
Jeremy Fitzhardinge | be43d72 | 2008-09-07 15:21:13 -0700 | [diff] [blame] | 92 | pteval_t __supported_pte_mask __read_mostly = ~_PAGE_IOMAP; |
Yinghai Lu | bd220a2 | 2008-09-05 00:58:28 -0700 | [diff] [blame] | 93 | EXPORT_SYMBOL_GPL(__supported_pte_mask); |
| 94 | |
| 95 | static int do_not_nx __cpuinitdata; |
| 96 | |
Ingo Molnar | deed05b | 2008-09-05 10:23:26 +0200 | [diff] [blame] | 97 | /* |
| 98 | * noexec=on|off |
| 99 | * Control non-executable mappings for 64-bit processes. |
| 100 | * |
| 101 | * on Enable (default) |
| 102 | * off Disable |
| 103 | */ |
Yinghai Lu | bd220a2 | 2008-09-05 00:58:28 -0700 | [diff] [blame] | 104 | static int __init nonx_setup(char *str) |
| 105 | { |
| 106 | if (!str) |
| 107 | return -EINVAL; |
| 108 | if (!strncmp(str, "on", 2)) { |
| 109 | __supported_pte_mask |= _PAGE_NX; |
| 110 | do_not_nx = 0; |
| 111 | } else if (!strncmp(str, "off", 3)) { |
| 112 | do_not_nx = 1; |
| 113 | __supported_pte_mask &= ~_PAGE_NX; |
| 114 | } |
| 115 | return 0; |
| 116 | } |
| 117 | early_param("noexec", nonx_setup); |
| 118 | |
| 119 | void __cpuinit check_efer(void) |
| 120 | { |
| 121 | unsigned long efer; |
| 122 | |
| 123 | rdmsrl(MSR_EFER, efer); |
| 124 | if (!(efer & EFER_NX) || do_not_nx) |
| 125 | __supported_pte_mask &= ~_PAGE_NX; |
| 126 | } |
| 127 | |
| 128 | int force_personality32; |
| 129 | |
Ingo Molnar | deed05b | 2008-09-05 10:23:26 +0200 | [diff] [blame] | 130 | /* |
| 131 | * noexec32=on|off |
| 132 | * Control non executable heap for 32bit processes. |
| 133 | * To control the stack too use noexec=off |
| 134 | * |
| 135 | * on PROT_READ does not imply PROT_EXEC for 32-bit processes (default) |
| 136 | * off PROT_READ implies PROT_EXEC |
| 137 | */ |
Yinghai Lu | bd220a2 | 2008-09-05 00:58:28 -0700 | [diff] [blame] | 138 | static int __init nonx32_setup(char *str) |
| 139 | { |
| 140 | if (!strcmp(str, "on")) |
| 141 | force_personality32 &= ~READ_IMPLIES_EXEC; |
| 142 | else if (!strcmp(str, "off")) |
| 143 | force_personality32 |= READ_IMPLIES_EXEC; |
| 144 | return 1; |
| 145 | } |
| 146 | __setup("noexec32=", nonx32_setup); |
| 147 | |
Marcin Slusarz | 8d6ea967 | 2008-08-15 18:32:24 +0200 | [diff] [blame] | 148 | /* |
| 149 | * NOTE: This function is marked __ref because it calls __init function |
| 150 | * (alloc_bootmem_pages). It's safe to do it ONLY when after_bootmem == 0. |
| 151 | */ |
| 152 | static __ref void *spp_getpage(void) |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 153 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | void *ptr; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 155 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | if (after_bootmem) |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 157 | ptr = (void *) get_zeroed_page(GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | else |
| 159 | ptr = alloc_bootmem_pages(PAGE_SIZE); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 160 | |
| 161 | if (!ptr || ((unsigned long)ptr & ~PAGE_MASK)) { |
| 162 | panic("set_pte_phys: cannot allocate page data %s\n", |
| 163 | after_bootmem ? "after bootmem" : ""); |
| 164 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | |
Ingo Molnar | 10f22dd | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 166 | pr_debug("spp_getpage %p\n", ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 168 | return ptr; |
| 169 | } |
| 170 | |
Jeremy Fitzhardinge | d494a96 | 2008-06-17 11:41:59 -0700 | [diff] [blame] | 171 | void |
Eduardo Habkost | 0814e0b | 2008-06-25 00:19:22 -0400 | [diff] [blame] | 172 | set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | pud_t *pud; |
| 175 | pmd_t *pmd; |
Jeremy Fitzhardinge | d494a96 | 2008-06-17 11:41:59 -0700 | [diff] [blame] | 176 | pte_t *pte; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | |
Eduardo Habkost | 0814e0b | 2008-06-25 00:19:22 -0400 | [diff] [blame] | 178 | pud = pud_page + pud_index(vaddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | if (pud_none(*pud)) { |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 180 | pmd = (pmd_t *) spp_getpage(); |
Jeremy Fitzhardinge | bb23e40 | 2008-06-25 00:19:02 -0400 | [diff] [blame] | 181 | pud_populate(&init_mm, pud, pmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | if (pmd != pmd_offset(pud, 0)) { |
Ingo Molnar | 10f22dd | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 183 | printk(KERN_ERR "PAGETABLE BUG #01! %p <-> %p\n", |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 184 | pmd, pmd_offset(pud, 0)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | return; |
| 186 | } |
| 187 | } |
| 188 | pmd = pmd_offset(pud, vaddr); |
| 189 | if (pmd_none(*pmd)) { |
| 190 | pte = (pte_t *) spp_getpage(); |
Jeremy Fitzhardinge | bb23e40 | 2008-06-25 00:19:02 -0400 | [diff] [blame] | 191 | pmd_populate_kernel(&init_mm, pmd, pte); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | if (pte != pte_offset_kernel(pmd, 0)) { |
Ingo Molnar | 10f22dd | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 193 | printk(KERN_ERR "PAGETABLE BUG #02!\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | return; |
| 195 | } |
| 196 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | |
| 198 | pte = pte_offset_kernel(pmd, vaddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | set_pte(pte, new_pte); |
| 200 | |
| 201 | /* |
| 202 | * It's enough to flush this one mapping. |
| 203 | * (PGE mappings get flushed as well) |
| 204 | */ |
| 205 | __flush_tlb_one(vaddr); |
| 206 | } |
| 207 | |
Eduardo Habkost | 0814e0b | 2008-06-25 00:19:22 -0400 | [diff] [blame] | 208 | void |
| 209 | set_pte_vaddr(unsigned long vaddr, pte_t pteval) |
| 210 | { |
| 211 | pgd_t *pgd; |
| 212 | pud_t *pud_page; |
| 213 | |
| 214 | pr_debug("set_pte_vaddr %lx to %lx\n", vaddr, native_pte_val(pteval)); |
| 215 | |
| 216 | pgd = pgd_offset_k(vaddr); |
| 217 | if (pgd_none(*pgd)) { |
| 218 | printk(KERN_ERR |
| 219 | "PGD FIXMAP MISSING, it should be setup in head.S!\n"); |
| 220 | return; |
| 221 | } |
| 222 | pud_page = (pud_t*)pgd_page_vaddr(*pgd); |
| 223 | set_pte_vaddr_pud(pud_page, vaddr, pteval); |
| 224 | } |
| 225 | |
Thomas Gleixner | 31eedd8 | 2008-02-15 17:29:12 +0100 | [diff] [blame] | 226 | /* |
Jack Steiner | 3a9e189 | 2008-07-01 14:45:32 -0500 | [diff] [blame] | 227 | * Create large page table mappings for a range of physical addresses. |
| 228 | */ |
| 229 | static void __init __init_extra_mapping(unsigned long phys, unsigned long size, |
| 230 | pgprot_t prot) |
| 231 | { |
| 232 | pgd_t *pgd; |
| 233 | pud_t *pud; |
| 234 | pmd_t *pmd; |
| 235 | |
| 236 | BUG_ON((phys & ~PMD_MASK) || (size & ~PMD_MASK)); |
| 237 | for (; size; phys += PMD_SIZE, size -= PMD_SIZE) { |
| 238 | pgd = pgd_offset_k((unsigned long)__va(phys)); |
| 239 | if (pgd_none(*pgd)) { |
| 240 | pud = (pud_t *) spp_getpage(); |
| 241 | set_pgd(pgd, __pgd(__pa(pud) | _KERNPG_TABLE | |
| 242 | _PAGE_USER)); |
| 243 | } |
| 244 | pud = pud_offset(pgd, (unsigned long)__va(phys)); |
| 245 | if (pud_none(*pud)) { |
| 246 | pmd = (pmd_t *) spp_getpage(); |
| 247 | set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE | |
| 248 | _PAGE_USER)); |
| 249 | } |
| 250 | pmd = pmd_offset(pud, phys); |
| 251 | BUG_ON(!pmd_none(*pmd)); |
| 252 | set_pmd(pmd, __pmd(phys | pgprot_val(prot))); |
| 253 | } |
| 254 | } |
| 255 | |
| 256 | void __init init_extra_mapping_wb(unsigned long phys, unsigned long size) |
| 257 | { |
| 258 | __init_extra_mapping(phys, size, PAGE_KERNEL_LARGE); |
| 259 | } |
| 260 | |
| 261 | void __init init_extra_mapping_uc(unsigned long phys, unsigned long size) |
| 262 | { |
| 263 | __init_extra_mapping(phys, size, PAGE_KERNEL_LARGE_NOCACHE); |
| 264 | } |
| 265 | |
| 266 | /* |
Ingo Molnar | 88f3aec | 2008-02-21 11:04:11 +0100 | [diff] [blame] | 267 | * The head.S code sets up the kernel high mapping: |
| 268 | * |
| 269 | * from __START_KERNEL_map to __START_KERNEL_map + size (== _end-_text) |
Thomas Gleixner | 31eedd8 | 2008-02-15 17:29:12 +0100 | [diff] [blame] | 270 | * |
| 271 | * phys_addr holds the negative offset to the kernel, which is added |
| 272 | * to the compile time generated pmds. This results in invalid pmds up |
| 273 | * to the point where we hit the physaddr 0 mapping. |
| 274 | * |
| 275 | * We limit the mappings to the region from _text to _end. _end is |
| 276 | * rounded up to the 2MB boundary. This catches the invalid pmds as |
| 277 | * well, as they are located before _text: |
| 278 | */ |
| 279 | void __init cleanup_highmap(void) |
| 280 | { |
| 281 | unsigned long vaddr = __START_KERNEL_map; |
Joerg Roedel | d86bb0d | 2008-07-25 16:48:57 +0200 | [diff] [blame] | 282 | unsigned long end = roundup((unsigned long)_end, PMD_SIZE) - 1; |
Thomas Gleixner | 31eedd8 | 2008-02-15 17:29:12 +0100 | [diff] [blame] | 283 | pmd_t *pmd = level2_kernel_pgt; |
| 284 | pmd_t *last_pmd = pmd + PTRS_PER_PMD; |
| 285 | |
| 286 | for (; pmd < last_pmd; pmd++, vaddr += PMD_SIZE) { |
Hugh Dickins | 2884f11 | 2008-05-28 19:36:07 +0100 | [diff] [blame] | 287 | if (pmd_none(*pmd)) |
Thomas Gleixner | 31eedd8 | 2008-02-15 17:29:12 +0100 | [diff] [blame] | 288 | continue; |
| 289 | if (vaddr < (unsigned long) _text || vaddr > end) |
| 290 | set_pmd(pmd, __pmd(0)); |
| 291 | } |
| 292 | } |
| 293 | |
Andi Kleen | 7517527 | 2008-01-30 13:33:17 +0100 | [diff] [blame] | 294 | static unsigned long __initdata table_start; |
| 295 | static unsigned long __meminitdata table_end; |
Yinghai Lu | d86623a | 2008-06-24 14:57:29 -0700 | [diff] [blame] | 296 | static unsigned long __meminitdata table_top; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | |
Jan Beulich | 9482ac6 | 2008-08-21 14:28:42 +0100 | [diff] [blame] | 298 | static __ref void *alloc_low_page(unsigned long *phys) |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 299 | { |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 300 | unsigned long pfn = table_end++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | void *adr; |
| 302 | |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 303 | if (after_bootmem) { |
| 304 | adr = (void *)get_zeroed_page(GFP_ATOMIC); |
| 305 | *phys = __pa(adr); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 306 | |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 307 | return adr; |
| 308 | } |
| 309 | |
Yinghai Lu | d86623a | 2008-06-24 14:57:29 -0700 | [diff] [blame] | 310 | if (pfn >= table_top) |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 311 | panic("alloc_low_page: ran out of memory"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | |
Jeremy Fitzhardinge | 1494177 | 2008-09-07 15:21:15 -0700 | [diff] [blame] | 313 | adr = early_memremap(pfn * PAGE_SIZE, PAGE_SIZE); |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 314 | memset(adr, 0, PAGE_SIZE); |
| 315 | *phys = pfn * PAGE_SIZE; |
| 316 | return adr; |
| 317 | } |
| 318 | |
Jan Beulich | 9482ac6 | 2008-08-21 14:28:42 +0100 | [diff] [blame] | 319 | static __ref void unmap_low_page(void *adr) |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 320 | { |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 321 | if (after_bootmem) |
| 322 | return; |
| 323 | |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 324 | early_iounmap(adr, PAGE_SIZE); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 325 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | |
Yinghai Lu | 7b16eb8 | 2008-07-09 20:15:02 -0700 | [diff] [blame] | 327 | static unsigned long __meminit |
Suresh Siddha | b27a43c | 2008-10-07 13:58:46 -0700 | [diff] [blame] | 328 | phys_pte_init(pte_t *pte_page, unsigned long addr, unsigned long end, |
| 329 | pgprot_t prot) |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 330 | { |
| 331 | unsigned pages = 0; |
Yinghai Lu | 7b16eb8 | 2008-07-09 20:15:02 -0700 | [diff] [blame] | 332 | unsigned long last_map_addr = end; |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 333 | int i; |
Yinghai Lu | 7b16eb8 | 2008-07-09 20:15:02 -0700 | [diff] [blame] | 334 | |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 335 | pte_t *pte = pte_page + pte_index(addr); |
| 336 | |
| 337 | for(i = pte_index(addr); i < PTRS_PER_PTE; i++, addr += PAGE_SIZE, pte++) { |
| 338 | |
| 339 | if (addr >= end) { |
| 340 | if (!after_bootmem) { |
| 341 | for(; i < PTRS_PER_PTE; i++, pte++) |
| 342 | set_pte(pte, __pte(0)); |
| 343 | } |
| 344 | break; |
| 345 | } |
| 346 | |
Suresh Siddha | b27a43c | 2008-10-07 13:58:46 -0700 | [diff] [blame] | 347 | /* |
| 348 | * We will re-use the existing mapping. |
| 349 | * Xen for example has some special requirements, like mapping |
| 350 | * pagetable pages as RO. So assume someone who pre-setup |
| 351 | * these mappings are more intelligent. |
| 352 | */ |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 353 | if (pte_val(*pte)) |
| 354 | continue; |
| 355 | |
| 356 | if (0) |
| 357 | printk(" pte=%p addr=%lx pte=%016lx\n", |
| 358 | pte, addr, pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL).pte); |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 359 | pages++; |
Suresh Siddha | b27a43c | 2008-10-07 13:58:46 -0700 | [diff] [blame] | 360 | set_pte(pte, pfn_pte(addr >> PAGE_SHIFT, prot)); |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 361 | last_map_addr = (addr & PAGE_MASK) + PAGE_SIZE; |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 362 | } |
Suresh Siddha | a2699e4 | 2008-09-23 14:00:38 -0700 | [diff] [blame] | 363 | |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 364 | update_page_count(PG_LEVEL_4K, pages); |
Yinghai Lu | 7b16eb8 | 2008-07-09 20:15:02 -0700 | [diff] [blame] | 365 | |
| 366 | return last_map_addr; |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 367 | } |
| 368 | |
Yinghai Lu | 7b16eb8 | 2008-07-09 20:15:02 -0700 | [diff] [blame] | 369 | static unsigned long __meminit |
Suresh Siddha | b27a43c | 2008-10-07 13:58:46 -0700 | [diff] [blame] | 370 | phys_pte_update(pmd_t *pmd, unsigned long address, unsigned long end, |
| 371 | pgprot_t prot) |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 372 | { |
| 373 | pte_t *pte = (pte_t *)pmd_page_vaddr(*pmd); |
| 374 | |
Suresh Siddha | b27a43c | 2008-10-07 13:58:46 -0700 | [diff] [blame] | 375 | return phys_pte_init(pte, address, end, prot); |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 376 | } |
| 377 | |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 378 | static unsigned long __meminit |
Yinghai Lu | b50efd2 | 2008-07-08 01:41:05 -0700 | [diff] [blame] | 379 | phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end, |
Suresh Siddha | b27a43c | 2008-10-07 13:58:46 -0700 | [diff] [blame] | 380 | unsigned long page_size_mask, pgprot_t prot) |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 381 | { |
Andi Kleen | ce0c0e5 | 2008-05-02 11:46:49 +0200 | [diff] [blame] | 382 | unsigned long pages = 0; |
Yinghai Lu | 7b16eb8 | 2008-07-09 20:15:02 -0700 | [diff] [blame] | 383 | unsigned long last_map_addr = end; |
Andi Kleen | ce0c0e5 | 2008-05-02 11:46:49 +0200 | [diff] [blame] | 384 | |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 385 | int i = pmd_index(address); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 387 | for (; i < PTRS_PER_PMD; i++, address += PMD_SIZE) { |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 388 | unsigned long pte_phys; |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 389 | pmd_t *pmd = pmd_page + pmd_index(address); |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 390 | pte_t *pte; |
Suresh Siddha | b27a43c | 2008-10-07 13:58:46 -0700 | [diff] [blame] | 391 | pgprot_t new_prot = prot; |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 392 | |
Jan Beulich | 5f51e13 | 2006-06-26 13:59:02 +0200 | [diff] [blame] | 393 | if (address >= end) { |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 394 | if (!after_bootmem) { |
Jan Beulich | 5f51e13 | 2006-06-26 13:59:02 +0200 | [diff] [blame] | 395 | for (; i < PTRS_PER_PMD; i++, pmd++) |
| 396 | set_pmd(pmd, __pmd(0)); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 397 | } |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 398 | break; |
| 399 | } |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 400 | |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 401 | if (pmd_val(*pmd)) { |
Jan Beulich | 8ae3a5a | 2008-08-21 14:27:22 +0100 | [diff] [blame] | 402 | if (!pmd_large(*pmd)) { |
| 403 | spin_lock(&init_mm.page_table_lock); |
Yinghai Lu | 7b16eb8 | 2008-07-09 20:15:02 -0700 | [diff] [blame] | 404 | last_map_addr = phys_pte_update(pmd, address, |
Suresh Siddha | b27a43c | 2008-10-07 13:58:46 -0700 | [diff] [blame] | 405 | end, prot); |
Jan Beulich | 8ae3a5a | 2008-08-21 14:27:22 +0100 | [diff] [blame] | 406 | spin_unlock(&init_mm.page_table_lock); |
Suresh Siddha | a2699e4 | 2008-09-23 14:00:38 -0700 | [diff] [blame] | 407 | continue; |
Jan Beulich | 8ae3a5a | 2008-08-21 14:27:22 +0100 | [diff] [blame] | 408 | } |
Suresh Siddha | b27a43c | 2008-10-07 13:58:46 -0700 | [diff] [blame] | 409 | /* |
| 410 | * If we are ok with PG_LEVEL_2M mapping, then we will |
| 411 | * use the existing mapping, |
| 412 | * |
| 413 | * Otherwise, we will split the large page mapping but |
| 414 | * use the same existing protection bits except for |
| 415 | * large page, so that we don't violate Intel's TLB |
| 416 | * Application note (317080) which says, while changing |
| 417 | * the page sizes, new and old translations should |
| 418 | * not differ with respect to page frame and |
| 419 | * attributes. |
| 420 | */ |
| 421 | if (page_size_mask & (1 << PG_LEVEL_2M)) |
| 422 | continue; |
| 423 | new_prot = pte_pgprot(pte_clrhuge(*(pte_t *)pmd)); |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 424 | } |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 425 | |
Yinghai Lu | b50efd2 | 2008-07-08 01:41:05 -0700 | [diff] [blame] | 426 | if (page_size_mask & (1<<PG_LEVEL_2M)) { |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 427 | pages++; |
Jan Beulich | 8ae3a5a | 2008-08-21 14:27:22 +0100 | [diff] [blame] | 428 | spin_lock(&init_mm.page_table_lock); |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 429 | set_pte((pte_t *)pmd, |
Suresh Siddha | b27a43c | 2008-10-07 13:58:46 -0700 | [diff] [blame] | 430 | pfn_pte(address >> PAGE_SHIFT, |
| 431 | __pgprot(pgprot_val(prot) | _PAGE_PSE))); |
Jan Beulich | 8ae3a5a | 2008-08-21 14:27:22 +0100 | [diff] [blame] | 432 | spin_unlock(&init_mm.page_table_lock); |
Yinghai Lu | 7b16eb8 | 2008-07-09 20:15:02 -0700 | [diff] [blame] | 433 | last_map_addr = (address & PMD_MASK) + PMD_SIZE; |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 434 | continue; |
| 435 | } |
| 436 | |
| 437 | pte = alloc_low_page(&pte_phys); |
Suresh Siddha | b27a43c | 2008-10-07 13:58:46 -0700 | [diff] [blame] | 438 | last_map_addr = phys_pte_init(pte, address, end, new_prot); |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 439 | unmap_low_page(pte); |
| 440 | |
Jan Beulich | 8ae3a5a | 2008-08-21 14:27:22 +0100 | [diff] [blame] | 441 | spin_lock(&init_mm.page_table_lock); |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 442 | pmd_populate_kernel(&init_mm, pmd, __va(pte_phys)); |
Jan Beulich | 8ae3a5a | 2008-08-21 14:27:22 +0100 | [diff] [blame] | 443 | spin_unlock(&init_mm.page_table_lock); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 444 | } |
Andi Kleen | ce0c0e5 | 2008-05-02 11:46:49 +0200 | [diff] [blame] | 445 | update_page_count(PG_LEVEL_2M, pages); |
Yinghai Lu | 7b16eb8 | 2008-07-09 20:15:02 -0700 | [diff] [blame] | 446 | return last_map_addr; |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 447 | } |
| 448 | |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 449 | static unsigned long __meminit |
Yinghai Lu | b50efd2 | 2008-07-08 01:41:05 -0700 | [diff] [blame] | 450 | phys_pmd_update(pud_t *pud, unsigned long address, unsigned long end, |
Suresh Siddha | b27a43c | 2008-10-07 13:58:46 -0700 | [diff] [blame] | 451 | unsigned long page_size_mask, pgprot_t prot) |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 452 | { |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 453 | pmd_t *pmd = pmd_offset(pud, 0); |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 454 | unsigned long last_map_addr; |
| 455 | |
Suresh Siddha | b27a43c | 2008-10-07 13:58:46 -0700 | [diff] [blame] | 456 | last_map_addr = phys_pmd_init(pmd, address, end, page_size_mask, prot); |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 457 | __flush_tlb_all(); |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 458 | return last_map_addr; |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 459 | } |
| 460 | |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 461 | static unsigned long __meminit |
Yinghai Lu | b50efd2 | 2008-07-08 01:41:05 -0700 | [diff] [blame] | 462 | phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end, |
| 463 | unsigned long page_size_mask) |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 464 | { |
Andi Kleen | ce0c0e5 | 2008-05-02 11:46:49 +0200 | [diff] [blame] | 465 | unsigned long pages = 0; |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 466 | unsigned long last_map_addr = end; |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 467 | int i = pud_index(addr); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 468 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 469 | for (; i < PTRS_PER_PUD; i++, addr = (addr & PUD_MASK) + PUD_SIZE) { |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 470 | unsigned long pmd_phys; |
| 471 | pud_t *pud = pud_page + pud_index(addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | pmd_t *pmd; |
Suresh Siddha | b27a43c | 2008-10-07 13:58:46 -0700 | [diff] [blame] | 473 | pgprot_t prot = PAGE_KERNEL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 475 | if (addr >= end) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 478 | if (!after_bootmem && |
| 479 | !e820_any_mapped(addr, addr+PUD_SIZE, 0)) { |
| 480 | set_pud(pud, __pud(0)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | continue; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 482 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 484 | if (pud_val(*pud)) { |
Suresh Siddha | a2699e4 | 2008-09-23 14:00:38 -0700 | [diff] [blame] | 485 | if (!pud_large(*pud)) { |
Yinghai Lu | b50efd2 | 2008-07-08 01:41:05 -0700 | [diff] [blame] | 486 | last_map_addr = phys_pmd_update(pud, addr, end, |
Suresh Siddha | b27a43c | 2008-10-07 13:58:46 -0700 | [diff] [blame] | 487 | page_size_mask, prot); |
Suresh Siddha | a2699e4 | 2008-09-23 14:00:38 -0700 | [diff] [blame] | 488 | continue; |
| 489 | } |
Suresh Siddha | b27a43c | 2008-10-07 13:58:46 -0700 | [diff] [blame] | 490 | /* |
| 491 | * If we are ok with PG_LEVEL_1G mapping, then we will |
| 492 | * use the existing mapping. |
| 493 | * |
| 494 | * Otherwise, we will split the gbpage mapping but use |
| 495 | * the same existing protection bits except for large |
| 496 | * page, so that we don't violate Intel's TLB |
| 497 | * Application note (317080) which says, while changing |
| 498 | * the page sizes, new and old translations should |
| 499 | * not differ with respect to page frame and |
| 500 | * attributes. |
| 501 | */ |
| 502 | if (page_size_mask & (1 << PG_LEVEL_1G)) |
| 503 | continue; |
| 504 | prot = pte_pgprot(pte_clrhuge(*(pte_t *)pud)); |
Andi Kleen | ef92576 | 2008-04-17 17:40:45 +0200 | [diff] [blame] | 505 | } |
| 506 | |
Yinghai Lu | b50efd2 | 2008-07-08 01:41:05 -0700 | [diff] [blame] | 507 | if (page_size_mask & (1<<PG_LEVEL_1G)) { |
Andi Kleen | ce0c0e5 | 2008-05-02 11:46:49 +0200 | [diff] [blame] | 508 | pages++; |
Jan Beulich | 8ae3a5a | 2008-08-21 14:27:22 +0100 | [diff] [blame] | 509 | spin_lock(&init_mm.page_table_lock); |
Andi Kleen | ef92576 | 2008-04-17 17:40:45 +0200 | [diff] [blame] | 510 | set_pte((pte_t *)pud, |
| 511 | pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL_LARGE)); |
Jan Beulich | 8ae3a5a | 2008-08-21 14:27:22 +0100 | [diff] [blame] | 512 | spin_unlock(&init_mm.page_table_lock); |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 513 | last_map_addr = (addr & PUD_MASK) + PUD_SIZE; |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 514 | continue; |
| 515 | } |
| 516 | |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 517 | pmd = alloc_low_page(&pmd_phys); |
Suresh Siddha | b27a43c | 2008-10-07 13:58:46 -0700 | [diff] [blame] | 518 | last_map_addr = phys_pmd_init(pmd, addr, end, page_size_mask, |
| 519 | prot); |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 520 | unmap_low_page(pmd); |
Jan Beulich | 8ae3a5a | 2008-08-21 14:27:22 +0100 | [diff] [blame] | 521 | |
| 522 | spin_lock(&init_mm.page_table_lock); |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 523 | pud_populate(&init_mm, pud, __va(pmd_phys)); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 524 | spin_unlock(&init_mm.page_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | } |
Andi Kleen | 1a2b441 | 2008-01-30 13:33:54 +0100 | [diff] [blame] | 526 | __flush_tlb_all(); |
Suresh Siddha | a2699e4 | 2008-09-23 14:00:38 -0700 | [diff] [blame] | 527 | |
Andi Kleen | ce0c0e5 | 2008-05-02 11:46:49 +0200 | [diff] [blame] | 528 | update_page_count(PG_LEVEL_1G, pages); |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 529 | |
Yinghai Lu | 1a0db38 | 2008-06-24 14:56:20 -0700 | [diff] [blame] | 530 | return last_map_addr; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 531 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 533 | static unsigned long __meminit |
Yinghai Lu | b50efd2 | 2008-07-08 01:41:05 -0700 | [diff] [blame] | 534 | phys_pud_update(pgd_t *pgd, unsigned long addr, unsigned long end, |
| 535 | unsigned long page_size_mask) |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 536 | { |
| 537 | pud_t *pud; |
| 538 | |
| 539 | pud = (pud_t *)pgd_page_vaddr(*pgd); |
| 540 | |
Yinghai Lu | b50efd2 | 2008-07-08 01:41:05 -0700 | [diff] [blame] | 541 | return phys_pud_init(pud, addr, end, page_size_mask); |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 542 | } |
| 543 | |
Suresh Siddha | 0b8fdcb | 2008-09-23 14:00:39 -0700 | [diff] [blame] | 544 | static void __init find_early_table_space(unsigned long end, int use_pse, |
| 545 | int use_gbpages) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | { |
Yinghai Lu | c2e6d65 | 2008-07-08 01:43:27 -0700 | [diff] [blame] | 547 | unsigned long puds, pmds, ptes, tables, start; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | |
| 549 | puds = (end + PUD_SIZE - 1) >> PUD_SHIFT; |
Joerg Roedel | d86bb0d | 2008-07-25 16:48:57 +0200 | [diff] [blame] | 550 | tables = roundup(puds * sizeof(pud_t), PAGE_SIZE); |
Suresh Siddha | 0b8fdcb | 2008-09-23 14:00:39 -0700 | [diff] [blame] | 551 | if (use_gbpages) { |
Yinghai Lu | c2e6d65 | 2008-07-08 01:43:27 -0700 | [diff] [blame] | 552 | unsigned long extra; |
| 553 | extra = end - ((end>>PUD_SHIFT) << PUD_SHIFT); |
| 554 | pmds = (extra + PMD_SIZE - 1) >> PMD_SHIFT; |
| 555 | } else |
| 556 | pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT; |
Joerg Roedel | d86bb0d | 2008-07-25 16:48:57 +0200 | [diff] [blame] | 557 | tables += roundup(pmds * sizeof(pmd_t), PAGE_SIZE); |
Yinghai Lu | c2e6d65 | 2008-07-08 01:43:27 -0700 | [diff] [blame] | 558 | |
Suresh Siddha | 0b8fdcb | 2008-09-23 14:00:39 -0700 | [diff] [blame] | 559 | if (use_pse) { |
Yinghai Lu | c2e6d65 | 2008-07-08 01:43:27 -0700 | [diff] [blame] | 560 | unsigned long extra; |
| 561 | extra = end - ((end>>PMD_SHIFT) << PMD_SHIFT); |
| 562 | ptes = (extra + PAGE_SIZE - 1) >> PAGE_SHIFT; |
| 563 | } else |
| 564 | ptes = (end + PAGE_SIZE - 1) >> PAGE_SHIFT; |
Joerg Roedel | d86bb0d | 2008-07-25 16:48:57 +0200 | [diff] [blame] | 565 | tables += roundup(ptes * sizeof(pte_t), PAGE_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 567 | /* |
| 568 | * RED-PEN putting page tables only on node 0 could |
| 569 | * cause a hotspot and fill up ZONE_DMA. The page tables |
| 570 | * need roughly 0.5KB per GB. |
| 571 | */ |
| 572 | start = 0x8000; |
Yinghai Lu | 24a5da7 | 2008-02-01 17:49:41 +0100 | [diff] [blame] | 573 | table_start = find_e820_area(start, end, tables, PAGE_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | if (table_start == -1UL) |
| 575 | panic("Cannot find space for the kernel page tables"); |
| 576 | |
| 577 | table_start >>= PAGE_SHIFT; |
| 578 | table_end = table_start; |
Yinghai Lu | d86623a | 2008-06-24 14:57:29 -0700 | [diff] [blame] | 579 | table_top = table_start + (tables >> PAGE_SHIFT); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 580 | |
Yinghai Lu | d86623a | 2008-06-24 14:57:29 -0700 | [diff] [blame] | 581 | printk(KERN_DEBUG "kernel direct mapping tables up to %lx @ %lx-%lx\n", |
| 582 | end, table_start << PAGE_SHIFT, table_top << PAGE_SHIFT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | } |
| 584 | |
Andi Kleen | ef92576 | 2008-04-17 17:40:45 +0200 | [diff] [blame] | 585 | static void __init init_gbpages(void) |
| 586 | { |
| 587 | if (direct_gbpages && cpu_has_gbpages) |
| 588 | printk(KERN_INFO "Using GB pages for direct mapping\n"); |
| 589 | else |
| 590 | direct_gbpages = 0; |
| 591 | } |
| 592 | |
Yinghai Lu | b50efd2 | 2008-07-08 01:41:05 -0700 | [diff] [blame] | 593 | static unsigned long __init kernel_physical_mapping_init(unsigned long start, |
| 594 | unsigned long end, |
| 595 | unsigned long page_size_mask) |
| 596 | { |
| 597 | |
| 598 | unsigned long next, last_map_addr = end; |
| 599 | |
| 600 | start = (unsigned long)__va(start); |
| 601 | end = (unsigned long)__va(end); |
| 602 | |
| 603 | for (; start < end; start = next) { |
| 604 | pgd_t *pgd = pgd_offset_k(start); |
| 605 | unsigned long pud_phys; |
| 606 | pud_t *pud; |
| 607 | |
Jack Steiner | e22146e | 2008-07-16 11:11:59 -0500 | [diff] [blame] | 608 | next = (start + PGDIR_SIZE) & PGDIR_MASK; |
Yinghai Lu | b50efd2 | 2008-07-08 01:41:05 -0700 | [diff] [blame] | 609 | if (next > end) |
| 610 | next = end; |
| 611 | |
| 612 | if (pgd_val(*pgd)) { |
| 613 | last_map_addr = phys_pud_update(pgd, __pa(start), |
| 614 | __pa(end), page_size_mask); |
| 615 | continue; |
| 616 | } |
| 617 | |
Jan Beulich | 8ae3a5a | 2008-08-21 14:27:22 +0100 | [diff] [blame] | 618 | pud = alloc_low_page(&pud_phys); |
Yinghai Lu | b50efd2 | 2008-07-08 01:41:05 -0700 | [diff] [blame] | 619 | last_map_addr = phys_pud_init(pud, __pa(start), __pa(next), |
| 620 | page_size_mask); |
| 621 | unmap_low_page(pud); |
Jan Beulich | 8ae3a5a | 2008-08-21 14:27:22 +0100 | [diff] [blame] | 622 | |
| 623 | spin_lock(&init_mm.page_table_lock); |
| 624 | pgd_populate(&init_mm, pgd, __va(pud_phys)); |
| 625 | spin_unlock(&init_mm.page_table_lock); |
Yinghai Lu | b50efd2 | 2008-07-08 01:41:05 -0700 | [diff] [blame] | 626 | } |
Suresh Siddha | a2699e4 | 2008-09-23 14:00:38 -0700 | [diff] [blame] | 627 | __flush_tlb_all(); |
Yinghai Lu | b50efd2 | 2008-07-08 01:41:05 -0700 | [diff] [blame] | 628 | |
| 629 | return last_map_addr; |
| 630 | } |
Yinghai Lu | 7b16eb8 | 2008-07-09 20:15:02 -0700 | [diff] [blame] | 631 | |
| 632 | struct map_range { |
| 633 | unsigned long start; |
| 634 | unsigned long end; |
| 635 | unsigned page_size_mask; |
| 636 | }; |
| 637 | |
| 638 | #define NR_RANGE_MR 5 |
| 639 | |
| 640 | static int save_mr(struct map_range *mr, int nr_range, |
| 641 | unsigned long start_pfn, unsigned long end_pfn, |
| 642 | unsigned long page_size_mask) |
| 643 | { |
| 644 | |
| 645 | if (start_pfn < end_pfn) { |
| 646 | if (nr_range >= NR_RANGE_MR) |
| 647 | panic("run out of range for init_memory_mapping\n"); |
| 648 | mr[nr_range].start = start_pfn<<PAGE_SHIFT; |
| 649 | mr[nr_range].end = end_pfn<<PAGE_SHIFT; |
| 650 | mr[nr_range].page_size_mask = page_size_mask; |
| 651 | nr_range++; |
| 652 | } |
| 653 | |
| 654 | return nr_range; |
| 655 | } |
| 656 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 657 | /* |
| 658 | * Setup the direct mapping of the physical memory at PAGE_OFFSET. |
| 659 | * This runs before bootmem is initialized and gets pages directly from |
| 660 | * the physical memory. To access them they are temporarily mapped. |
| 661 | */ |
Yinghai Lu | b50efd2 | 2008-07-08 01:41:05 -0700 | [diff] [blame] | 662 | unsigned long __init_refok init_memory_mapping(unsigned long start, |
| 663 | unsigned long end) |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 664 | { |
Yinghai Lu | 7b16eb8 | 2008-07-09 20:15:02 -0700 | [diff] [blame] | 665 | unsigned long last_map_addr = 0; |
Yinghai Lu | b50efd2 | 2008-07-08 01:41:05 -0700 | [diff] [blame] | 666 | unsigned long page_size_mask = 0; |
Yinghai Lu | c2e6d65 | 2008-07-08 01:43:27 -0700 | [diff] [blame] | 667 | unsigned long start_pfn, end_pfn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | |
Yinghai Lu | 7b16eb8 | 2008-07-09 20:15:02 -0700 | [diff] [blame] | 669 | struct map_range mr[NR_RANGE_MR]; |
| 670 | int nr_range, i; |
Suresh Siddha | 0b8fdcb | 2008-09-23 14:00:39 -0700 | [diff] [blame] | 671 | int use_pse, use_gbpages; |
Yinghai Lu | 7b16eb8 | 2008-07-09 20:15:02 -0700 | [diff] [blame] | 672 | |
Yinghai Lu | 272b9ca | 2008-03-20 23:58:33 -0700 | [diff] [blame] | 673 | printk(KERN_INFO "init_memory_mapping\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 675 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | * Find space for the kernel direct mapping tables. |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 677 | * |
| 678 | * Later we should allocate these tables in the local node of the |
| 679 | * memory mapped. Unfortunately this is done currently before the |
| 680 | * nodes are discovered. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | */ |
Yinghai Lu | 7b16eb8 | 2008-07-09 20:15:02 -0700 | [diff] [blame] | 682 | if (!after_bootmem) |
Andi Kleen | ef92576 | 2008-04-17 17:40:45 +0200 | [diff] [blame] | 683 | init_gbpages(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | |
Suresh Siddha | 0b8fdcb | 2008-09-23 14:00:39 -0700 | [diff] [blame] | 685 | #ifdef CONFIG_DEBUG_PAGEALLOC |
| 686 | /* |
| 687 | * For CONFIG_DEBUG_PAGEALLOC, identity mapping will use small pages. |
| 688 | * This will simplify cpa(), which otherwise needs to support splitting |
| 689 | * large pages into small in interrupt context, etc. |
| 690 | */ |
| 691 | use_pse = use_gbpages = 0; |
| 692 | #else |
| 693 | use_pse = cpu_has_pse; |
| 694 | use_gbpages = direct_gbpages; |
| 695 | #endif |
| 696 | |
| 697 | if (use_gbpages) |
Yinghai Lu | b50efd2 | 2008-07-08 01:41:05 -0700 | [diff] [blame] | 698 | page_size_mask |= 1 << PG_LEVEL_1G; |
Suresh Siddha | 0b8fdcb | 2008-09-23 14:00:39 -0700 | [diff] [blame] | 699 | if (use_pse) |
Yinghai Lu | b50efd2 | 2008-07-08 01:41:05 -0700 | [diff] [blame] | 700 | page_size_mask |= 1 << PG_LEVEL_2M; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | |
Yinghai Lu | 7b16eb8 | 2008-07-09 20:15:02 -0700 | [diff] [blame] | 702 | memset(mr, 0, sizeof(mr)); |
| 703 | nr_range = 0; |
| 704 | |
| 705 | /* head if not big page alignment ?*/ |
Yinghai Lu | c2e6d65 | 2008-07-08 01:43:27 -0700 | [diff] [blame] | 706 | start_pfn = start >> PAGE_SHIFT; |
| 707 | end_pfn = ((start + (PMD_SIZE - 1)) >> PMD_SHIFT) |
| 708 | << (PMD_SHIFT - PAGE_SHIFT); |
Yinghai Lu | 7b16eb8 | 2008-07-09 20:15:02 -0700 | [diff] [blame] | 709 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0); |
Yinghai Lu | c2e6d65 | 2008-07-08 01:43:27 -0700 | [diff] [blame] | 710 | |
| 711 | /* big page (2M) range*/ |
| 712 | start_pfn = ((start + (PMD_SIZE - 1))>>PMD_SHIFT) |
| 713 | << (PMD_SHIFT - PAGE_SHIFT); |
| 714 | end_pfn = ((start + (PUD_SIZE - 1))>>PUD_SHIFT) |
| 715 | << (PUD_SHIFT - PAGE_SHIFT); |
| 716 | if (end_pfn > ((end>>PUD_SHIFT)<<(PUD_SHIFT - PAGE_SHIFT))) |
| 717 | end_pfn = ((end>>PUD_SHIFT)<<(PUD_SHIFT - PAGE_SHIFT)); |
Yinghai Lu | 7b16eb8 | 2008-07-09 20:15:02 -0700 | [diff] [blame] | 718 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, |
| 719 | page_size_mask & (1<<PG_LEVEL_2M)); |
Yinghai Lu | c2e6d65 | 2008-07-08 01:43:27 -0700 | [diff] [blame] | 720 | |
| 721 | /* big page (1G) range */ |
| 722 | start_pfn = end_pfn; |
| 723 | end_pfn = (end>>PUD_SHIFT) << (PUD_SHIFT - PAGE_SHIFT); |
Yinghai Lu | 7b16eb8 | 2008-07-09 20:15:02 -0700 | [diff] [blame] | 724 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, |
| 725 | page_size_mask & |
| 726 | ((1<<PG_LEVEL_2M)|(1<<PG_LEVEL_1G))); |
Yinghai Lu | c2e6d65 | 2008-07-08 01:43:27 -0700 | [diff] [blame] | 727 | |
| 728 | /* tail is not big page (1G) alignment */ |
| 729 | start_pfn = end_pfn; |
| 730 | end_pfn = (end>>PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT); |
Yinghai Lu | 7b16eb8 | 2008-07-09 20:15:02 -0700 | [diff] [blame] | 731 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, |
| 732 | page_size_mask & (1<<PG_LEVEL_2M)); |
| 733 | |
Yinghai Lu | c2e6d65 | 2008-07-08 01:43:27 -0700 | [diff] [blame] | 734 | /* tail is not big page (2M) alignment */ |
| 735 | start_pfn = end_pfn; |
| 736 | end_pfn = end>>PAGE_SHIFT; |
Yinghai Lu | 7b16eb8 | 2008-07-09 20:15:02 -0700 | [diff] [blame] | 737 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0); |
| 738 | |
Yinghai Lu | 9958e81 | 2008-07-12 14:32:45 -0700 | [diff] [blame] | 739 | /* try to merge same page size and continuous */ |
| 740 | for (i = 0; nr_range > 1 && i < nr_range - 1; i++) { |
| 741 | unsigned long old_start; |
| 742 | if (mr[i].end != mr[i+1].start || |
| 743 | mr[i].page_size_mask != mr[i+1].page_size_mask) |
| 744 | continue; |
| 745 | /* move it */ |
| 746 | old_start = mr[i].start; |
| 747 | memmove(&mr[i], &mr[i+1], |
| 748 | (nr_range - 1 - i) * sizeof (struct map_range)); |
Jan Beulich | 5e72d9e | 2008-09-12 15:43:04 +0100 | [diff] [blame] | 749 | mr[i--].start = old_start; |
Yinghai Lu | 9958e81 | 2008-07-12 14:32:45 -0700 | [diff] [blame] | 750 | nr_range--; |
| 751 | } |
| 752 | |
Yinghai Lu | 7b16eb8 | 2008-07-09 20:15:02 -0700 | [diff] [blame] | 753 | for (i = 0; i < nr_range; i++) |
| 754 | printk(KERN_DEBUG " %010lx - %010lx page %s\n", |
| 755 | mr[i].start, mr[i].end, |
| 756 | (mr[i].page_size_mask & (1<<PG_LEVEL_1G))?"1G":( |
| 757 | (mr[i].page_size_mask & (1<<PG_LEVEL_2M))?"2M":"4k")); |
| 758 | |
| 759 | if (!after_bootmem) |
Suresh Siddha | 0b8fdcb | 2008-09-23 14:00:39 -0700 | [diff] [blame] | 760 | find_early_table_space(end, use_pse, use_gbpages); |
Yinghai Lu | 7b16eb8 | 2008-07-09 20:15:02 -0700 | [diff] [blame] | 761 | |
| 762 | for (i = 0; i < nr_range; i++) |
Yinghai Lu | c2e6d65 | 2008-07-08 01:43:27 -0700 | [diff] [blame] | 763 | last_map_addr = kernel_physical_mapping_init( |
Yinghai Lu | 7b16eb8 | 2008-07-09 20:15:02 -0700 | [diff] [blame] | 764 | mr[i].start, mr[i].end, |
| 765 | mr[i].page_size_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 767 | if (!after_bootmem) |
Glauber de Oliveira Costa | f51c945 | 2007-07-22 11:12:29 +0200 | [diff] [blame] | 768 | mmu_cr4_features = read_cr4(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | __flush_tlb_all(); |
Andi Kleen | 7517527 | 2008-01-30 13:33:17 +0100 | [diff] [blame] | 770 | |
Yinghai Lu | b50efd2 | 2008-07-08 01:41:05 -0700 | [diff] [blame] | 771 | if (!after_bootmem && table_end > table_start) |
Yinghai Lu | 24a5da7 | 2008-02-01 17:49:41 +0100 | [diff] [blame] | 772 | reserve_early(table_start << PAGE_SHIFT, |
| 773 | table_end << PAGE_SHIFT, "PGTABLE"); |
Yinghai Lu | 272b9ca | 2008-03-20 23:58:33 -0700 | [diff] [blame] | 774 | |
Yinghai Lu | b50efd2 | 2008-07-08 01:41:05 -0700 | [diff] [blame] | 775 | printk(KERN_INFO "last_map_addr: %lx end: %lx\n", |
| 776 | last_map_addr, end); |
| 777 | |
Yinghai Lu | 272b9ca | 2008-03-20 23:58:33 -0700 | [diff] [blame] | 778 | if (!after_bootmem) |
Yinghai Lu | b50efd2 | 2008-07-08 01:41:05 -0700 | [diff] [blame] | 779 | early_memtest(start, end); |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 780 | |
Yinghai Lu | 1a0db38 | 2008-06-24 14:56:20 -0700 | [diff] [blame] | 781 | return last_map_addr >> PAGE_SHIFT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | } |
| 783 | |
Matt Tolentino | 2b97690 | 2005-06-23 00:08:06 -0700 | [diff] [blame] | 784 | #ifndef CONFIG_NUMA |
Yinghai Lu | 1f75d7e | 2008-06-22 02:44:49 -0700 | [diff] [blame] | 785 | void __init initmem_init(unsigned long start_pfn, unsigned long end_pfn) |
| 786 | { |
| 787 | unsigned long bootmap_size, bootmap; |
| 788 | |
| 789 | bootmap_size = bootmem_bootmap_pages(end_pfn)<<PAGE_SHIFT; |
| 790 | bootmap = find_e820_area(0, end_pfn<<PAGE_SHIFT, bootmap_size, |
| 791 | PAGE_SIZE); |
| 792 | if (bootmap == -1L) |
| 793 | panic("Cannot find bootmem map of size %ld\n", bootmap_size); |
Yinghai Lu | 346cafe | 2008-06-23 03:06:14 -0700 | [diff] [blame] | 794 | /* don't touch min_low_pfn */ |
| 795 | bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap >> PAGE_SHIFT, |
| 796 | 0, end_pfn); |
Yinghai Lu | 1f75d7e | 2008-06-22 02:44:49 -0700 | [diff] [blame] | 797 | e820_register_active_regions(0, start_pfn, end_pfn); |
| 798 | free_bootmem_with_active_regions(0, end_pfn); |
| 799 | early_res_to_bootmem(0, end_pfn<<PAGE_SHIFT); |
| 800 | reserve_bootmem(bootmap, bootmap_size, BOOTMEM_DEFAULT); |
| 801 | } |
| 802 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | void __init paging_init(void) |
| 804 | { |
Mel Gorman | 6391af1 | 2006-10-11 01:20:39 -0700 | [diff] [blame] | 805 | unsigned long max_zone_pfns[MAX_NR_ZONES]; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 806 | |
Mel Gorman | 6391af1 | 2006-10-11 01:20:39 -0700 | [diff] [blame] | 807 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); |
| 808 | max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN; |
| 809 | max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN; |
Yinghai Lu | c987d12 | 2008-06-24 22:14:09 -0700 | [diff] [blame] | 810 | max_zone_pfns[ZONE_NORMAL] = max_pfn; |
Mel Gorman | 6391af1 | 2006-10-11 01:20:39 -0700 | [diff] [blame] | 811 | |
Yinghai Lu | c987d12 | 2008-06-24 22:14:09 -0700 | [diff] [blame] | 812 | memory_present(0, 0, max_pfn); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 813 | sparse_init(); |
Mel Gorman | 5cb248a | 2006-09-27 01:49:52 -0700 | [diff] [blame] | 814 | free_area_init_nodes(max_zone_pfns); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | } |
| 816 | #endif |
| 817 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 818 | /* |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 819 | * Memory hotplug specific functions |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 820 | */ |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 821 | #ifdef CONFIG_MEMORY_HOTPLUG |
| 822 | /* |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 823 | * Memory is added always to NORMAL zone. This means you will never get |
| 824 | * additional DMA/DMA32 memory. |
| 825 | */ |
| 826 | int arch_add_memory(int nid, u64 start, u64 size) |
| 827 | { |
| 828 | struct pglist_data *pgdat = NODE_DATA(nid); |
Christoph Lameter | 776ed98 | 2006-09-25 23:31:09 -0700 | [diff] [blame] | 829 | struct zone *zone = pgdat->node_zones + ZONE_NORMAL; |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 830 | unsigned long last_mapped_pfn, start_pfn = start >> PAGE_SHIFT; |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 831 | unsigned long nr_pages = size >> PAGE_SHIFT; |
| 832 | int ret; |
| 833 | |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 834 | last_mapped_pfn = init_memory_mapping(start, start + size-1); |
| 835 | if (last_mapped_pfn > max_pfn_mapped) |
| 836 | max_pfn_mapped = last_mapped_pfn; |
Keith Mannthey | 45e0b78 | 2006-09-30 23:27:09 -0700 | [diff] [blame] | 837 | |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 838 | ret = __add_pages(zone, start_pfn, nr_pages); |
Ingo Molnar | 10f22dd | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 839 | WARN_ON(1); |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 840 | |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 841 | return ret; |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 842 | } |
| 843 | EXPORT_SYMBOL_GPL(arch_add_memory); |
| 844 | |
Yasunori Goto | 8243229 | 2006-11-18 22:19:40 -0800 | [diff] [blame] | 845 | #if !defined(CONFIG_ACPI_NUMA) && defined(CONFIG_NUMA) |
Keith Mannthey | 4942e99 | 2006-09-30 23:27:06 -0700 | [diff] [blame] | 846 | int memory_add_physaddr_to_nid(u64 start) |
| 847 | { |
| 848 | return 0; |
| 849 | } |
Keith Mannthey | 8c2676a | 2006-09-30 23:27:07 -0700 | [diff] [blame] | 850 | EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid); |
Keith Mannthey | 4942e99 | 2006-09-30 23:27:06 -0700 | [diff] [blame] | 851 | #endif |
| 852 | |
Keith Mannthey | 45e0b78 | 2006-09-30 23:27:09 -0700 | [diff] [blame] | 853 | #endif /* CONFIG_MEMORY_HOTPLUG */ |
| 854 | |
Arjan van de Ven | ae531c2 | 2008-04-24 23:40:47 +0200 | [diff] [blame] | 855 | /* |
| 856 | * devmem_is_allowed() checks to see if /dev/mem access to a certain address |
| 857 | * is valid. The argument is a physical page number. |
| 858 | * |
| 859 | * |
| 860 | * On x86, access has to be given to the first megabyte of ram because that area |
| 861 | * contains bios code and data regions used by X and dosemu and similar apps. |
| 862 | * Access has to be given to non-kernel-ram areas as well, these contain the PCI |
| 863 | * mmio resources as well as potential bios/acpi data regions. |
| 864 | */ |
| 865 | int devmem_is_allowed(unsigned long pagenr) |
| 866 | { |
| 867 | if (pagenr <= 256) |
| 868 | return 1; |
| 869 | if (!page_is_ram(pagenr)) |
| 870 | return 1; |
| 871 | return 0; |
| 872 | } |
| 873 | |
| 874 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 875 | static struct kcore_list kcore_mem, kcore_vmalloc, kcore_kernel, |
| 876 | kcore_modules, kcore_vsyscall; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 877 | |
| 878 | void __init mem_init(void) |
| 879 | { |
Andi Kleen | 0a43e4b | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 880 | long codesize, reservedpages, datasize, initsize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 881 | |
Jon Mason | 0dc243a | 2006-06-26 13:58:11 +0200 | [diff] [blame] | 882 | pci_iommu_alloc(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | |
Yinghai Lu | 48ddb15 | 2008-01-30 13:32:36 +0100 | [diff] [blame] | 884 | /* clear_bss() already clear the empty_zero_page */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | |
| 886 | reservedpages = 0; |
| 887 | |
| 888 | /* this will put all low memory onto the freelists */ |
Matt Tolentino | 2b97690 | 2005-06-23 00:08:06 -0700 | [diff] [blame] | 889 | #ifdef CONFIG_NUMA |
Andi Kleen | 0a43e4b | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 890 | totalram_pages = numa_free_all_bootmem(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | #else |
Andi Kleen | 0a43e4b | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 892 | totalram_pages = free_all_bootmem(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 893 | #endif |
Yinghai Lu | c987d12 | 2008-06-24 22:14:09 -0700 | [diff] [blame] | 894 | reservedpages = max_pfn - totalram_pages - |
| 895 | absent_pages_in_range(0, max_pfn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | after_bootmem = 1; |
| 897 | |
| 898 | codesize = (unsigned long) &_etext - (unsigned long) &_text; |
| 899 | datasize = (unsigned long) &_edata - (unsigned long) &_etext; |
| 900 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; |
| 901 | |
| 902 | /* Register memory areas for /proc/kcore */ |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 903 | kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT); |
| 904 | kclist_add(&kcore_vmalloc, (void *)VMALLOC_START, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 905 | VMALLOC_END-VMALLOC_START); |
| 906 | kclist_add(&kcore_kernel, &_stext, _end - _stext); |
| 907 | kclist_add(&kcore_modules, (void *)MODULES_VADDR, MODULES_LEN); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 908 | kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | VSYSCALL_END - VSYSCALL_START); |
| 910 | |
Ingo Molnar | 10f22dd | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 911 | printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, " |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 912 | "%ldk reserved, %ldk data, %ldk init)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 913 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), |
Yinghai Lu | c987d12 | 2008-06-24 22:14:09 -0700 | [diff] [blame] | 914 | max_pfn << (PAGE_SHIFT-10), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 915 | codesize >> 10, |
| 916 | reservedpages << (PAGE_SHIFT-10), |
| 917 | datasize >> 10, |
| 918 | initsize >> 10); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | } |
| 920 | |
Gerd Hoffmann | d167a51 | 2006-06-26 13:56:16 +0200 | [diff] [blame] | 921 | void free_init_pages(char *what, unsigned long begin, unsigned long end) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 922 | { |
Thomas Gleixner | bfc734b | 2008-02-09 23:24:09 +0100 | [diff] [blame] | 923 | unsigned long addr = begin; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | |
Thomas Gleixner | bfc734b | 2008-02-09 23:24:09 +0100 | [diff] [blame] | 925 | if (addr >= end) |
Gerd Hoffmann | d167a51 | 2006-06-26 13:56:16 +0200 | [diff] [blame] | 926 | return; |
| 927 | |
Ingo Molnar | ee01f11 | 2008-01-30 13:34:09 +0100 | [diff] [blame] | 928 | /* |
| 929 | * If debugging page accesses then do not free this memory but |
| 930 | * mark them not present - any buggy init-section access will |
| 931 | * create a kernel page fault: |
| 932 | */ |
| 933 | #ifdef CONFIG_DEBUG_PAGEALLOC |
| 934 | printk(KERN_INFO "debug: unmapping init memory %08lx..%08lx\n", |
| 935 | begin, PAGE_ALIGN(end)); |
| 936 | set_memory_np(begin, (end - begin) >> PAGE_SHIFT); |
| 937 | #else |
Jan Beulich | 6fb1475 | 2007-05-02 19:27:10 +0200 | [diff] [blame] | 938 | printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 939 | |
Thomas Gleixner | bfc734b | 2008-02-09 23:24:09 +0100 | [diff] [blame] | 940 | for (; addr < end; addr += PAGE_SIZE) { |
Linus Torvalds | e3ebadd | 2007-05-07 08:44:24 -0700 | [diff] [blame] | 941 | ClearPageReserved(virt_to_page(addr)); |
| 942 | init_page_count(virt_to_page(addr)); |
| 943 | memset((void *)(addr & ~(PAGE_SIZE-1)), |
| 944 | POISON_FREE_INITMEM, PAGE_SIZE); |
Linus Torvalds | e3ebadd | 2007-05-07 08:44:24 -0700 | [diff] [blame] | 945 | free_page(addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | totalram_pages++; |
| 947 | } |
Ingo Molnar | ee01f11 | 2008-01-30 13:34:09 +0100 | [diff] [blame] | 948 | #endif |
Gerd Hoffmann | d167a51 | 2006-06-26 13:56:16 +0200 | [diff] [blame] | 949 | } |
| 950 | |
| 951 | void free_initmem(void) |
| 952 | { |
Gerd Hoffmann | d167a51 | 2006-06-26 13:56:16 +0200 | [diff] [blame] | 953 | free_init_pages("unused kernel memory", |
Linus Torvalds | e3ebadd | 2007-05-07 08:44:24 -0700 | [diff] [blame] | 954 | (unsigned long)(&__init_begin), |
| 955 | (unsigned long)(&__init_end)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 956 | } |
| 957 | |
Arjan van de Ven | 67df197 | 2006-01-06 00:12:04 -0800 | [diff] [blame] | 958 | #ifdef CONFIG_DEBUG_RODATA |
Arjan van de Ven | edeed30 | 2008-01-30 13:34:08 +0100 | [diff] [blame] | 959 | const int rodata_test_data = 0xC3; |
| 960 | EXPORT_SYMBOL_GPL(rodata_test_data); |
Arjan van de Ven | 67df197 | 2006-01-06 00:12:04 -0800 | [diff] [blame] | 961 | |
Arjan van de Ven | 67df197 | 2006-01-06 00:12:04 -0800 | [diff] [blame] | 962 | void mark_rodata_ro(void) |
| 963 | { |
Mathieu Desnoyers | 4e4eee0 | 2008-02-02 15:42:20 -0500 | [diff] [blame] | 964 | unsigned long start = PFN_ALIGN(_stext), end = PFN_ALIGN(__end_rodata); |
Steven Rostedt | 8f0f996 | 2008-05-12 21:20:56 +0200 | [diff] [blame] | 965 | unsigned long rodata_start = |
| 966 | ((unsigned long)__start_rodata + PAGE_SIZE - 1) & PAGE_MASK; |
| 967 | |
| 968 | #ifdef CONFIG_DYNAMIC_FTRACE |
| 969 | /* Dynamic tracing modifies the kernel text section */ |
| 970 | start = rodata_start; |
| 971 | #endif |
Arjan van de Ven | 67df197 | 2006-01-06 00:12:04 -0800 | [diff] [blame] | 972 | |
Jan Beulich | 6fb1475 | 2007-05-02 19:27:10 +0200 | [diff] [blame] | 973 | printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n", |
Linus Torvalds | e3ebadd | 2007-05-07 08:44:24 -0700 | [diff] [blame] | 974 | (end - start) >> 10); |
Arjan van de Ven | 984bb80 | 2008-02-06 22:39:45 +0100 | [diff] [blame] | 975 | set_memory_ro(start, (end - start) >> PAGE_SHIFT); |
| 976 | |
| 977 | /* |
| 978 | * The rodata section (but not the kernel text!) should also be |
| 979 | * not-executable. |
| 980 | */ |
Pekka Paalanen | 72b59d67 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 981 | set_memory_nx(rodata_start, (end - rodata_start) >> PAGE_SHIFT); |
Arjan van de Ven | 67df197 | 2006-01-06 00:12:04 -0800 | [diff] [blame] | 982 | |
Arjan van de Ven | 1a48725 | 2008-01-30 13:34:09 +0100 | [diff] [blame] | 983 | rodata_test(); |
| 984 | |
Andi Kleen | 0c42f39 | 2008-01-30 13:33:42 +0100 | [diff] [blame] | 985 | #ifdef CONFIG_CPA_DEBUG |
Ingo Molnar | 10f22dd | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 986 | printk(KERN_INFO "Testing CPA: undo %lx-%lx\n", start, end); |
Arjan van de Ven | 6d238cc | 2008-01-30 13:34:06 +0100 | [diff] [blame] | 987 | set_memory_rw(start, (end-start) >> PAGE_SHIFT); |
Andi Kleen | 0c42f39 | 2008-01-30 13:33:42 +0100 | [diff] [blame] | 988 | |
Ingo Molnar | 10f22dd | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 989 | printk(KERN_INFO "Testing CPA: again\n"); |
Arjan van de Ven | 6d238cc | 2008-01-30 13:34:06 +0100 | [diff] [blame] | 990 | set_memory_ro(start, (end-start) >> PAGE_SHIFT); |
Andi Kleen | 0c42f39 | 2008-01-30 13:33:42 +0100 | [diff] [blame] | 991 | #endif |
Arjan van de Ven | 67df197 | 2006-01-06 00:12:04 -0800 | [diff] [blame] | 992 | } |
Mathieu Desnoyers | 4e4eee0 | 2008-02-02 15:42:20 -0500 | [diff] [blame] | 993 | |
Arjan van de Ven | 67df197 | 2006-01-06 00:12:04 -0800 | [diff] [blame] | 994 | #endif |
| 995 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 996 | #ifdef CONFIG_BLK_DEV_INITRD |
| 997 | void free_initrd_mem(unsigned long start, unsigned long end) |
| 998 | { |
Linus Torvalds | e3ebadd | 2007-05-07 08:44:24 -0700 | [diff] [blame] | 999 | free_init_pages("initrd memory", start, end); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1000 | } |
| 1001 | #endif |
| 1002 | |
Yinghai Lu | d2dbf34 | 2008-06-13 02:00:56 -0700 | [diff] [blame] | 1003 | int __init reserve_bootmem_generic(unsigned long phys, unsigned long len, |
| 1004 | int flags) |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1005 | { |
Matt Tolentino | 2b97690 | 2005-06-23 00:08:06 -0700 | [diff] [blame] | 1006 | #ifdef CONFIG_NUMA |
Yinghai Lu | 8b3cd09e | 2008-03-18 12:50:21 -0700 | [diff] [blame] | 1007 | int nid, next_nid; |
Yinghai Lu | 6a07a0e | 2008-06-23 14:02:36 -0700 | [diff] [blame] | 1008 | int ret; |
Andi Kleen | 5e58a02 | 2006-11-14 16:57:46 +0100 | [diff] [blame] | 1009 | #endif |
| 1010 | unsigned long pfn = phys >> PAGE_SHIFT; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1011 | |
Yinghai Lu | c987d12 | 2008-06-24 22:14:09 -0700 | [diff] [blame] | 1012 | if (pfn >= max_pfn) { |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1013 | /* |
| 1014 | * This can happen with kdump kernels when accessing |
| 1015 | * firmware tables: |
| 1016 | */ |
Thomas Gleixner | 6779429 | 2008-03-21 21:27:10 +0100 | [diff] [blame] | 1017 | if (pfn < max_pfn_mapped) |
Bernhard Walle | 8b2ef1d | 2008-06-08 15:46:30 +0200 | [diff] [blame] | 1018 | return -EFAULT; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1019 | |
Yinghai Lu | 6a07a0e | 2008-06-23 14:02:36 -0700 | [diff] [blame] | 1020 | printk(KERN_ERR "reserve_bootmem: illegal reserve %lx %lu\n", |
Andi Kleen | 5e58a02 | 2006-11-14 16:57:46 +0100 | [diff] [blame] | 1021 | phys, len); |
Bernhard Walle | 8b2ef1d | 2008-06-08 15:46:30 +0200 | [diff] [blame] | 1022 | return -EFAULT; |
Andi Kleen | 5e58a02 | 2006-11-14 16:57:46 +0100 | [diff] [blame] | 1023 | } |
| 1024 | |
| 1025 | /* Should check here against the e820 map to avoid double free */ |
| 1026 | #ifdef CONFIG_NUMA |
Yinghai Lu | 8b3cd09e | 2008-03-18 12:50:21 -0700 | [diff] [blame] | 1027 | nid = phys_to_nid(phys); |
| 1028 | next_nid = phys_to_nid(phys + len - 1); |
| 1029 | if (nid == next_nid) |
Bernhard Walle | 8b2ef1d | 2008-06-08 15:46:30 +0200 | [diff] [blame] | 1030 | ret = reserve_bootmem_node(NODE_DATA(nid), phys, len, flags); |
Yinghai Lu | 8b3cd09e | 2008-03-18 12:50:21 -0700 | [diff] [blame] | 1031 | else |
Bernhard Walle | 8b2ef1d | 2008-06-08 15:46:30 +0200 | [diff] [blame] | 1032 | ret = reserve_bootmem(phys, len, flags); |
| 1033 | |
| 1034 | if (ret != 0) |
| 1035 | return ret; |
| 1036 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1037 | #else |
Bernhard Walle | 72a7fe3 | 2008-02-07 00:15:17 -0800 | [diff] [blame] | 1038 | reserve_bootmem(phys, len, BOOTMEM_DEFAULT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1039 | #endif |
Yinghai Lu | 8b3cd09e | 2008-03-18 12:50:21 -0700 | [diff] [blame] | 1040 | |
Mel Gorman | 0e0b864 | 2006-09-27 01:49:56 -0700 | [diff] [blame] | 1041 | if (phys+len <= MAX_DMA_PFN*PAGE_SIZE) { |
Andi Kleen | e18c687 | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 1042 | dma_reserve += len / PAGE_SIZE; |
Mel Gorman | 0e0b864 | 2006-09-27 01:49:56 -0700 | [diff] [blame] | 1043 | set_dma_reserve(dma_reserve); |
| 1044 | } |
Bernhard Walle | 8b2ef1d | 2008-06-08 15:46:30 +0200 | [diff] [blame] | 1045 | |
| 1046 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1047 | } |
| 1048 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1049 | int kern_addr_valid(unsigned long addr) |
| 1050 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1051 | unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1052 | pgd_t *pgd; |
| 1053 | pud_t *pud; |
| 1054 | pmd_t *pmd; |
| 1055 | pte_t *pte; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1056 | |
| 1057 | if (above != 0 && above != -1UL) |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1058 | return 0; |
| 1059 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1060 | pgd = pgd_offset_k(addr); |
| 1061 | if (pgd_none(*pgd)) |
| 1062 | return 0; |
| 1063 | |
| 1064 | pud = pud_offset(pgd, addr); |
| 1065 | if (pud_none(*pud)) |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1066 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1067 | |
| 1068 | pmd = pmd_offset(pud, addr); |
| 1069 | if (pmd_none(*pmd)) |
| 1070 | return 0; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1071 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1072 | if (pmd_large(*pmd)) |
| 1073 | return pfn_valid(pmd_pfn(*pmd)); |
| 1074 | |
| 1075 | pte = pte_offset_kernel(pmd, addr); |
| 1076 | if (pte_none(*pte)) |
| 1077 | return 0; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1078 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1079 | return pfn_valid(pte_pfn(*pte)); |
| 1080 | } |
| 1081 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1082 | /* |
| 1083 | * A pseudo VMA to allow ptrace access for the vsyscall page. This only |
| 1084 | * covers the 64bit vsyscall page now. 32bit has a real VMA now and does |
| 1085 | * not need special handling anymore: |
| 1086 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1087 | static struct vm_area_struct gate_vma = { |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1088 | .vm_start = VSYSCALL_START, |
| 1089 | .vm_end = VSYSCALL_START + (VSYSCALL_MAPPED_PAGES * PAGE_SIZE), |
| 1090 | .vm_page_prot = PAGE_READONLY_EXEC, |
| 1091 | .vm_flags = VM_READ | VM_EXEC |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1092 | }; |
| 1093 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1094 | struct vm_area_struct *get_gate_vma(struct task_struct *tsk) |
| 1095 | { |
| 1096 | #ifdef CONFIG_IA32_EMULATION |
Andi Kleen | 1e01441 | 2005-04-16 15:24:55 -0700 | [diff] [blame] | 1097 | if (test_tsk_thread_flag(tsk, TIF_IA32)) |
| 1098 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1099 | #endif |
| 1100 | return &gate_vma; |
| 1101 | } |
| 1102 | |
| 1103 | int in_gate_area(struct task_struct *task, unsigned long addr) |
| 1104 | { |
| 1105 | struct vm_area_struct *vma = get_gate_vma(task); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1106 | |
Andi Kleen | 1e01441 | 2005-04-16 15:24:55 -0700 | [diff] [blame] | 1107 | if (!vma) |
| 1108 | return 0; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1109 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1110 | return (addr >= vma->vm_start) && (addr < vma->vm_end); |
| 1111 | } |
| 1112 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1113 | /* |
| 1114 | * Use this when you have no reliable task/vma, typically from interrupt |
| 1115 | * context. It is less reliable than using the task's vma and may give |
| 1116 | * false positives: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1117 | */ |
| 1118 | int in_gate_area_no_task(unsigned long addr) |
| 1119 | { |
Andi Kleen | 1e01441 | 2005-04-16 15:24:55 -0700 | [diff] [blame] | 1120 | return (addr >= VSYSCALL_START) && (addr < VSYSCALL_END); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1121 | } |
Zou Nan hai | 2e1c49d | 2007-06-01 00:46:28 -0700 | [diff] [blame] | 1122 | |
Andi Kleen | 2aae950 | 2007-07-21 17:10:01 +0200 | [diff] [blame] | 1123 | const char *arch_vma_name(struct vm_area_struct *vma) |
| 1124 | { |
| 1125 | if (vma->vm_mm && vma->vm_start == (long)vma->vm_mm->context.vdso) |
| 1126 | return "[vdso]"; |
| 1127 | if (vma == &gate_vma) |
| 1128 | return "[vsyscall]"; |
| 1129 | return NULL; |
| 1130 | } |
Christoph Lameter | 0889eba | 2007-10-16 01:24:15 -0700 | [diff] [blame] | 1131 | |
| 1132 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
| 1133 | /* |
| 1134 | * Initialise the sparsemem vmemmap using huge-pages at the PMD level. |
| 1135 | */ |
Yinghai Lu | c2b91e2 | 2008-04-12 01:19:24 -0700 | [diff] [blame] | 1136 | static long __meminitdata addr_start, addr_end; |
| 1137 | static void __meminitdata *p_start, *p_end; |
| 1138 | static int __meminitdata node_start; |
| 1139 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1140 | int __meminit |
| 1141 | vmemmap_populate(struct page *start_page, unsigned long size, int node) |
Christoph Lameter | 0889eba | 2007-10-16 01:24:15 -0700 | [diff] [blame] | 1142 | { |
| 1143 | unsigned long addr = (unsigned long)start_page; |
| 1144 | unsigned long end = (unsigned long)(start_page + size); |
| 1145 | unsigned long next; |
| 1146 | pgd_t *pgd; |
| 1147 | pud_t *pud; |
| 1148 | pmd_t *pmd; |
| 1149 | |
| 1150 | for (; addr < end; addr = next) { |
Jeremy Fitzhardinge | 7c934d3 | 2008-06-25 00:19:20 -0400 | [diff] [blame] | 1151 | void *p = NULL; |
Christoph Lameter | 0889eba | 2007-10-16 01:24:15 -0700 | [diff] [blame] | 1152 | |
| 1153 | pgd = vmemmap_pgd_populate(addr, node); |
| 1154 | if (!pgd) |
| 1155 | return -ENOMEM; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1156 | |
Christoph Lameter | 0889eba | 2007-10-16 01:24:15 -0700 | [diff] [blame] | 1157 | pud = vmemmap_pud_populate(pgd, addr, node); |
| 1158 | if (!pud) |
| 1159 | return -ENOMEM; |
| 1160 | |
Jeremy Fitzhardinge | 7c934d3 | 2008-06-25 00:19:20 -0400 | [diff] [blame] | 1161 | if (!cpu_has_pse) { |
| 1162 | next = (addr + PAGE_SIZE) & PAGE_MASK; |
| 1163 | pmd = vmemmap_pmd_populate(pud, addr, node); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1164 | |
Jeremy Fitzhardinge | 7c934d3 | 2008-06-25 00:19:20 -0400 | [diff] [blame] | 1165 | if (!pmd) |
| 1166 | return -ENOMEM; |
| 1167 | |
| 1168 | p = vmemmap_pte_populate(pmd, addr, node); |
| 1169 | |
Christoph Lameter | 0889eba | 2007-10-16 01:24:15 -0700 | [diff] [blame] | 1170 | if (!p) |
| 1171 | return -ENOMEM; |
| 1172 | |
Jeremy Fitzhardinge | 7c934d3 | 2008-06-25 00:19:20 -0400 | [diff] [blame] | 1173 | addr_end = addr + PAGE_SIZE; |
| 1174 | p_end = p + PAGE_SIZE; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1175 | } else { |
Jeremy Fitzhardinge | 7c934d3 | 2008-06-25 00:19:20 -0400 | [diff] [blame] | 1176 | next = pmd_addr_end(addr, end); |
| 1177 | |
| 1178 | pmd = pmd_offset(pud, addr); |
| 1179 | if (pmd_none(*pmd)) { |
| 1180 | pte_t entry; |
| 1181 | |
| 1182 | p = vmemmap_alloc_block(PMD_SIZE, node); |
| 1183 | if (!p) |
| 1184 | return -ENOMEM; |
| 1185 | |
| 1186 | entry = pfn_pte(__pa(p) >> PAGE_SHIFT, |
| 1187 | PAGE_KERNEL_LARGE); |
| 1188 | set_pmd(pmd, __pmd(pte_val(entry))); |
| 1189 | |
Jeremy Fitzhardinge | 7c934d3 | 2008-06-25 00:19:20 -0400 | [diff] [blame] | 1190 | /* check to see if we have contiguous blocks */ |
| 1191 | if (p_end != p || node_start != node) { |
| 1192 | if (p_start) |
| 1193 | printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n", |
| 1194 | addr_start, addr_end-1, p_start, p_end-1, node_start); |
| 1195 | addr_start = addr; |
| 1196 | node_start = node; |
| 1197 | p_start = p; |
| 1198 | } |
Yinghai Lu | 49c980d | 2008-07-03 12:29:34 -0700 | [diff] [blame] | 1199 | |
| 1200 | addr_end = addr + PMD_SIZE; |
| 1201 | p_end = p + PMD_SIZE; |
Jeremy Fitzhardinge | 7c934d3 | 2008-06-25 00:19:20 -0400 | [diff] [blame] | 1202 | } else |
| 1203 | vmemmap_verify((pte_t *)pmd, node, addr, next); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1204 | } |
Jeremy Fitzhardinge | 7c934d3 | 2008-06-25 00:19:20 -0400 | [diff] [blame] | 1205 | |
Christoph Lameter | 0889eba | 2007-10-16 01:24:15 -0700 | [diff] [blame] | 1206 | } |
Christoph Lameter | 0889eba | 2007-10-16 01:24:15 -0700 | [diff] [blame] | 1207 | return 0; |
| 1208 | } |
Yinghai Lu | c2b91e2 | 2008-04-12 01:19:24 -0700 | [diff] [blame] | 1209 | |
| 1210 | void __meminit vmemmap_populate_print_last(void) |
| 1211 | { |
| 1212 | if (p_start) { |
| 1213 | printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n", |
| 1214 | addr_start, addr_end-1, p_start, p_end-1, node_start); |
| 1215 | p_start = NULL; |
| 1216 | p_end = NULL; |
| 1217 | node_start = 0; |
| 1218 | } |
| 1219 | } |
Christoph Lameter | 0889eba | 2007-10-16 01:24:15 -0700 | [diff] [blame] | 1220 | #endif |