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 | |
Tejun Heo | 1112441 | 2009-02-20 16:29:09 +0900 | [diff] [blame] | 226 | void __init populate_extra_pte(unsigned long vaddr) |
| 227 | { |
| 228 | pgd_t *pgd; |
| 229 | pud_t *pud; |
| 230 | |
| 231 | pgd = pgd_offset_k(vaddr); |
| 232 | if (pgd_none(*pgd)) { |
| 233 | pud = (pud_t *)spp_getpage(); |
| 234 | pgd_populate(&init_mm, pgd, pud); |
| 235 | if (pud != pud_offset(pgd, 0)) { |
| 236 | printk(KERN_ERR "PAGETABLE BUG #00! %p <-> %p\n", |
| 237 | pud, pud_offset(pgd, 0)); |
| 238 | return; |
| 239 | } |
| 240 | } |
| 241 | |
| 242 | set_pte_vaddr_pud((pud_t *)pgd_page_vaddr(*pgd), vaddr, __pte(0)); |
| 243 | } |
| 244 | |
Thomas Gleixner | 31eedd8 | 2008-02-15 17:29:12 +0100 | [diff] [blame] | 245 | /* |
Jack Steiner | 3a9e189 | 2008-07-01 14:45:32 -0500 | [diff] [blame] | 246 | * Create large page table mappings for a range of physical addresses. |
| 247 | */ |
| 248 | static void __init __init_extra_mapping(unsigned long phys, unsigned long size, |
| 249 | pgprot_t prot) |
| 250 | { |
| 251 | pgd_t *pgd; |
| 252 | pud_t *pud; |
| 253 | pmd_t *pmd; |
| 254 | |
| 255 | BUG_ON((phys & ~PMD_MASK) || (size & ~PMD_MASK)); |
| 256 | for (; size; phys += PMD_SIZE, size -= PMD_SIZE) { |
| 257 | pgd = pgd_offset_k((unsigned long)__va(phys)); |
| 258 | if (pgd_none(*pgd)) { |
| 259 | pud = (pud_t *) spp_getpage(); |
| 260 | set_pgd(pgd, __pgd(__pa(pud) | _KERNPG_TABLE | |
| 261 | _PAGE_USER)); |
| 262 | } |
| 263 | pud = pud_offset(pgd, (unsigned long)__va(phys)); |
| 264 | if (pud_none(*pud)) { |
| 265 | pmd = (pmd_t *) spp_getpage(); |
| 266 | set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE | |
| 267 | _PAGE_USER)); |
| 268 | } |
| 269 | pmd = pmd_offset(pud, phys); |
| 270 | BUG_ON(!pmd_none(*pmd)); |
| 271 | set_pmd(pmd, __pmd(phys | pgprot_val(prot))); |
| 272 | } |
| 273 | } |
| 274 | |
| 275 | void __init init_extra_mapping_wb(unsigned long phys, unsigned long size) |
| 276 | { |
| 277 | __init_extra_mapping(phys, size, PAGE_KERNEL_LARGE); |
| 278 | } |
| 279 | |
| 280 | void __init init_extra_mapping_uc(unsigned long phys, unsigned long size) |
| 281 | { |
| 282 | __init_extra_mapping(phys, size, PAGE_KERNEL_LARGE_NOCACHE); |
| 283 | } |
| 284 | |
| 285 | /* |
Ingo Molnar | 88f3aec | 2008-02-21 11:04:11 +0100 | [diff] [blame] | 286 | * The head.S code sets up the kernel high mapping: |
| 287 | * |
| 288 | * from __START_KERNEL_map to __START_KERNEL_map + size (== _end-_text) |
Thomas Gleixner | 31eedd8 | 2008-02-15 17:29:12 +0100 | [diff] [blame] | 289 | * |
| 290 | * phys_addr holds the negative offset to the kernel, which is added |
| 291 | * to the compile time generated pmds. This results in invalid pmds up |
| 292 | * to the point where we hit the physaddr 0 mapping. |
| 293 | * |
| 294 | * We limit the mappings to the region from _text to _end. _end is |
| 295 | * rounded up to the 2MB boundary. This catches the invalid pmds as |
| 296 | * well, as they are located before _text: |
| 297 | */ |
| 298 | void __init cleanup_highmap(void) |
| 299 | { |
| 300 | unsigned long vaddr = __START_KERNEL_map; |
Joerg Roedel | d86bb0d | 2008-07-25 16:48:57 +0200 | [diff] [blame] | 301 | unsigned long end = roundup((unsigned long)_end, PMD_SIZE) - 1; |
Thomas Gleixner | 31eedd8 | 2008-02-15 17:29:12 +0100 | [diff] [blame] | 302 | pmd_t *pmd = level2_kernel_pgt; |
| 303 | pmd_t *last_pmd = pmd + PTRS_PER_PMD; |
| 304 | |
| 305 | for (; pmd < last_pmd; pmd++, vaddr += PMD_SIZE) { |
Hugh Dickins | 2884f11 | 2008-05-28 19:36:07 +0100 | [diff] [blame] | 306 | if (pmd_none(*pmd)) |
Thomas Gleixner | 31eedd8 | 2008-02-15 17:29:12 +0100 | [diff] [blame] | 307 | continue; |
| 308 | if (vaddr < (unsigned long) _text || vaddr > end) |
| 309 | set_pmd(pmd, __pmd(0)); |
| 310 | } |
| 311 | } |
| 312 | |
Andi Kleen | 7517527 | 2008-01-30 13:33:17 +0100 | [diff] [blame] | 313 | static unsigned long __initdata table_start; |
| 314 | static unsigned long __meminitdata table_end; |
Yinghai Lu | d86623a | 2008-06-24 14:57:29 -0700 | [diff] [blame] | 315 | static unsigned long __meminitdata table_top; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | |
Jan Beulich | 9482ac6 | 2008-08-21 14:28:42 +0100 | [diff] [blame] | 317 | static __ref void *alloc_low_page(unsigned long *phys) |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 318 | { |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 319 | unsigned long pfn = table_end++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | void *adr; |
| 321 | |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 322 | if (after_bootmem) { |
| 323 | adr = (void *)get_zeroed_page(GFP_ATOMIC); |
| 324 | *phys = __pa(adr); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 325 | |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 326 | return adr; |
| 327 | } |
| 328 | |
Yinghai Lu | d86623a | 2008-06-24 14:57:29 -0700 | [diff] [blame] | 329 | if (pfn >= table_top) |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 330 | panic("alloc_low_page: ran out of memory"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | |
Jeremy Fitzhardinge | 1494177 | 2008-09-07 15:21:15 -0700 | [diff] [blame] | 332 | adr = early_memremap(pfn * PAGE_SIZE, PAGE_SIZE); |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 333 | memset(adr, 0, PAGE_SIZE); |
| 334 | *phys = pfn * PAGE_SIZE; |
| 335 | return adr; |
| 336 | } |
| 337 | |
Jan Beulich | 9482ac6 | 2008-08-21 14:28:42 +0100 | [diff] [blame] | 338 | static __ref void unmap_low_page(void *adr) |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 339 | { |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 340 | if (after_bootmem) |
| 341 | return; |
| 342 | |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 343 | early_iounmap(adr, PAGE_SIZE); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 344 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | |
Yinghai Lu | 7b16eb8 | 2008-07-09 20:15:02 -0700 | [diff] [blame] | 346 | static unsigned long __meminit |
Suresh Siddha | b27a43c | 2008-10-07 13:58:46 -0700 | [diff] [blame] | 347 | phys_pte_init(pte_t *pte_page, unsigned long addr, unsigned long end, |
| 348 | pgprot_t prot) |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 349 | { |
| 350 | unsigned pages = 0; |
Yinghai Lu | 7b16eb8 | 2008-07-09 20:15:02 -0700 | [diff] [blame] | 351 | unsigned long last_map_addr = end; |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 352 | int i; |
Yinghai Lu | 7b16eb8 | 2008-07-09 20:15:02 -0700 | [diff] [blame] | 353 | |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 354 | pte_t *pte = pte_page + pte_index(addr); |
| 355 | |
| 356 | for(i = pte_index(addr); i < PTRS_PER_PTE; i++, addr += PAGE_SIZE, pte++) { |
| 357 | |
| 358 | if (addr >= end) { |
| 359 | if (!after_bootmem) { |
| 360 | for(; i < PTRS_PER_PTE; i++, pte++) |
| 361 | set_pte(pte, __pte(0)); |
| 362 | } |
| 363 | break; |
| 364 | } |
| 365 | |
Suresh Siddha | b27a43c | 2008-10-07 13:58:46 -0700 | [diff] [blame] | 366 | /* |
| 367 | * We will re-use the existing mapping. |
| 368 | * Xen for example has some special requirements, like mapping |
| 369 | * pagetable pages as RO. So assume someone who pre-setup |
| 370 | * these mappings are more intelligent. |
| 371 | */ |
Yinghai Lu | 3afa394 | 2008-10-25 22:58:21 -0700 | [diff] [blame] | 372 | if (pte_val(*pte)) { |
| 373 | pages++; |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 374 | continue; |
Yinghai Lu | 3afa394 | 2008-10-25 22:58:21 -0700 | [diff] [blame] | 375 | } |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 376 | |
| 377 | if (0) |
| 378 | printk(" pte=%p addr=%lx pte=%016lx\n", |
| 379 | pte, addr, pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL).pte); |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 380 | pages++; |
Suresh Siddha | b27a43c | 2008-10-07 13:58:46 -0700 | [diff] [blame] | 381 | set_pte(pte, pfn_pte(addr >> PAGE_SHIFT, prot)); |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 382 | last_map_addr = (addr & PAGE_MASK) + PAGE_SIZE; |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 383 | } |
Suresh Siddha | a2699e4 | 2008-09-23 14:00:38 -0700 | [diff] [blame] | 384 | |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 385 | update_page_count(PG_LEVEL_4K, pages); |
Yinghai Lu | 7b16eb8 | 2008-07-09 20:15:02 -0700 | [diff] [blame] | 386 | |
| 387 | return last_map_addr; |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 388 | } |
| 389 | |
Yinghai Lu | 7b16eb8 | 2008-07-09 20:15:02 -0700 | [diff] [blame] | 390 | static unsigned long __meminit |
Suresh Siddha | b27a43c | 2008-10-07 13:58:46 -0700 | [diff] [blame] | 391 | phys_pte_update(pmd_t *pmd, unsigned long address, unsigned long end, |
| 392 | pgprot_t prot) |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 393 | { |
| 394 | pte_t *pte = (pte_t *)pmd_page_vaddr(*pmd); |
| 395 | |
Suresh Siddha | b27a43c | 2008-10-07 13:58:46 -0700 | [diff] [blame] | 396 | return phys_pte_init(pte, address, end, prot); |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 397 | } |
| 398 | |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 399 | static unsigned long __meminit |
Yinghai Lu | b50efd2 | 2008-07-08 01:41:05 -0700 | [diff] [blame] | 400 | 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] | 401 | unsigned long page_size_mask, pgprot_t prot) |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 402 | { |
Andi Kleen | ce0c0e5 | 2008-05-02 11:46:49 +0200 | [diff] [blame] | 403 | unsigned long pages = 0; |
Yinghai Lu | 7b16eb8 | 2008-07-09 20:15:02 -0700 | [diff] [blame] | 404 | unsigned long last_map_addr = end; |
Andi Kleen | ce0c0e5 | 2008-05-02 11:46:49 +0200 | [diff] [blame] | 405 | |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 406 | int i = pmd_index(address); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 408 | for (; i < PTRS_PER_PMD; i++, address += PMD_SIZE) { |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 409 | unsigned long pte_phys; |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 410 | pmd_t *pmd = pmd_page + pmd_index(address); |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 411 | pte_t *pte; |
Suresh Siddha | b27a43c | 2008-10-07 13:58:46 -0700 | [diff] [blame] | 412 | pgprot_t new_prot = prot; |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 413 | |
Jan Beulich | 5f51e13 | 2006-06-26 13:59:02 +0200 | [diff] [blame] | 414 | if (address >= end) { |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 415 | if (!after_bootmem) { |
Jan Beulich | 5f51e13 | 2006-06-26 13:59:02 +0200 | [diff] [blame] | 416 | for (; i < PTRS_PER_PMD; i++, pmd++) |
| 417 | set_pmd(pmd, __pmd(0)); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 418 | } |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 419 | break; |
| 420 | } |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 421 | |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 422 | if (pmd_val(*pmd)) { |
Jan Beulich | 8ae3a5a | 2008-08-21 14:27:22 +0100 | [diff] [blame] | 423 | if (!pmd_large(*pmd)) { |
| 424 | spin_lock(&init_mm.page_table_lock); |
Yinghai Lu | 7b16eb8 | 2008-07-09 20:15:02 -0700 | [diff] [blame] | 425 | last_map_addr = phys_pte_update(pmd, address, |
Suresh Siddha | b27a43c | 2008-10-07 13:58:46 -0700 | [diff] [blame] | 426 | end, prot); |
Jan Beulich | 8ae3a5a | 2008-08-21 14:27:22 +0100 | [diff] [blame] | 427 | spin_unlock(&init_mm.page_table_lock); |
Suresh Siddha | a2699e4 | 2008-09-23 14:00:38 -0700 | [diff] [blame] | 428 | continue; |
Jan Beulich | 8ae3a5a | 2008-08-21 14:27:22 +0100 | [diff] [blame] | 429 | } |
Suresh Siddha | b27a43c | 2008-10-07 13:58:46 -0700 | [diff] [blame] | 430 | /* |
| 431 | * If we are ok with PG_LEVEL_2M mapping, then we will |
| 432 | * use the existing mapping, |
| 433 | * |
| 434 | * Otherwise, we will split the large page mapping but |
| 435 | * use the same existing protection bits except for |
| 436 | * large page, so that we don't violate Intel's TLB |
| 437 | * Application note (317080) which says, while changing |
| 438 | * the page sizes, new and old translations should |
| 439 | * not differ with respect to page frame and |
| 440 | * attributes. |
| 441 | */ |
Yinghai Lu | 3afa394 | 2008-10-25 22:58:21 -0700 | [diff] [blame] | 442 | if (page_size_mask & (1 << PG_LEVEL_2M)) { |
| 443 | pages++; |
Suresh Siddha | b27a43c | 2008-10-07 13:58:46 -0700 | [diff] [blame] | 444 | continue; |
Yinghai Lu | 3afa394 | 2008-10-25 22:58:21 -0700 | [diff] [blame] | 445 | } |
Suresh Siddha | b27a43c | 2008-10-07 13:58:46 -0700 | [diff] [blame] | 446 | new_prot = pte_pgprot(pte_clrhuge(*(pte_t *)pmd)); |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 447 | } |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 448 | |
Yinghai Lu | b50efd2 | 2008-07-08 01:41:05 -0700 | [diff] [blame] | 449 | if (page_size_mask & (1<<PG_LEVEL_2M)) { |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 450 | pages++; |
Jan Beulich | 8ae3a5a | 2008-08-21 14:27:22 +0100 | [diff] [blame] | 451 | spin_lock(&init_mm.page_table_lock); |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 452 | set_pte((pte_t *)pmd, |
Suresh Siddha | b27a43c | 2008-10-07 13:58:46 -0700 | [diff] [blame] | 453 | pfn_pte(address >> PAGE_SHIFT, |
| 454 | __pgprot(pgprot_val(prot) | _PAGE_PSE))); |
Jan Beulich | 8ae3a5a | 2008-08-21 14:27:22 +0100 | [diff] [blame] | 455 | spin_unlock(&init_mm.page_table_lock); |
Yinghai Lu | 7b16eb8 | 2008-07-09 20:15:02 -0700 | [diff] [blame] | 456 | last_map_addr = (address & PMD_MASK) + PMD_SIZE; |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 457 | continue; |
| 458 | } |
| 459 | |
| 460 | pte = alloc_low_page(&pte_phys); |
Suresh Siddha | b27a43c | 2008-10-07 13:58:46 -0700 | [diff] [blame] | 461 | last_map_addr = phys_pte_init(pte, address, end, new_prot); |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 462 | unmap_low_page(pte); |
| 463 | |
Jan Beulich | 8ae3a5a | 2008-08-21 14:27:22 +0100 | [diff] [blame] | 464 | spin_lock(&init_mm.page_table_lock); |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 465 | pmd_populate_kernel(&init_mm, pmd, __va(pte_phys)); |
Jan Beulich | 8ae3a5a | 2008-08-21 14:27:22 +0100 | [diff] [blame] | 466 | spin_unlock(&init_mm.page_table_lock); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 467 | } |
Andi Kleen | ce0c0e5 | 2008-05-02 11:46:49 +0200 | [diff] [blame] | 468 | update_page_count(PG_LEVEL_2M, pages); |
Yinghai Lu | 7b16eb8 | 2008-07-09 20:15:02 -0700 | [diff] [blame] | 469 | return last_map_addr; |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 470 | } |
| 471 | |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 472 | static unsigned long __meminit |
Yinghai Lu | b50efd2 | 2008-07-08 01:41:05 -0700 | [diff] [blame] | 473 | phys_pmd_update(pud_t *pud, unsigned long address, unsigned long end, |
Suresh Siddha | b27a43c | 2008-10-07 13:58:46 -0700 | [diff] [blame] | 474 | unsigned long page_size_mask, pgprot_t prot) |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 475 | { |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 476 | pmd_t *pmd = pmd_offset(pud, 0); |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 477 | unsigned long last_map_addr; |
| 478 | |
Suresh Siddha | b27a43c | 2008-10-07 13:58:46 -0700 | [diff] [blame] | 479 | 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] | 480 | __flush_tlb_all(); |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 481 | return last_map_addr; |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 482 | } |
| 483 | |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 484 | static unsigned long __meminit |
Yinghai Lu | b50efd2 | 2008-07-08 01:41:05 -0700 | [diff] [blame] | 485 | phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end, |
| 486 | unsigned long page_size_mask) |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 487 | { |
Andi Kleen | ce0c0e5 | 2008-05-02 11:46:49 +0200 | [diff] [blame] | 488 | unsigned long pages = 0; |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 489 | unsigned long last_map_addr = end; |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 490 | int i = pud_index(addr); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 491 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 492 | for (; i < PTRS_PER_PUD; i++, addr = (addr & PUD_MASK) + PUD_SIZE) { |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 493 | unsigned long pmd_phys; |
| 494 | pud_t *pud = pud_page + pud_index(addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | pmd_t *pmd; |
Suresh Siddha | b27a43c | 2008-10-07 13:58:46 -0700 | [diff] [blame] | 496 | pgprot_t prot = PAGE_KERNEL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 498 | if (addr >= end) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 501 | if (!after_bootmem && |
| 502 | !e820_any_mapped(addr, addr+PUD_SIZE, 0)) { |
| 503 | set_pud(pud, __pud(0)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | continue; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 505 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 507 | if (pud_val(*pud)) { |
Suresh Siddha | a2699e4 | 2008-09-23 14:00:38 -0700 | [diff] [blame] | 508 | if (!pud_large(*pud)) { |
Yinghai Lu | b50efd2 | 2008-07-08 01:41:05 -0700 | [diff] [blame] | 509 | last_map_addr = phys_pmd_update(pud, addr, end, |
Suresh Siddha | b27a43c | 2008-10-07 13:58:46 -0700 | [diff] [blame] | 510 | page_size_mask, prot); |
Suresh Siddha | a2699e4 | 2008-09-23 14:00:38 -0700 | [diff] [blame] | 511 | continue; |
| 512 | } |
Suresh Siddha | b27a43c | 2008-10-07 13:58:46 -0700 | [diff] [blame] | 513 | /* |
| 514 | * If we are ok with PG_LEVEL_1G mapping, then we will |
| 515 | * use the existing mapping. |
| 516 | * |
| 517 | * Otherwise, we will split the gbpage mapping but use |
| 518 | * the same existing protection bits except for large |
| 519 | * page, so that we don't violate Intel's TLB |
| 520 | * Application note (317080) which says, while changing |
| 521 | * the page sizes, new and old translations should |
| 522 | * not differ with respect to page frame and |
| 523 | * attributes. |
| 524 | */ |
Yinghai Lu | 3afa394 | 2008-10-25 22:58:21 -0700 | [diff] [blame] | 525 | if (page_size_mask & (1 << PG_LEVEL_1G)) { |
| 526 | pages++; |
Suresh Siddha | b27a43c | 2008-10-07 13:58:46 -0700 | [diff] [blame] | 527 | continue; |
Yinghai Lu | 3afa394 | 2008-10-25 22:58:21 -0700 | [diff] [blame] | 528 | } |
Suresh Siddha | b27a43c | 2008-10-07 13:58:46 -0700 | [diff] [blame] | 529 | prot = pte_pgprot(pte_clrhuge(*(pte_t *)pud)); |
Andi Kleen | ef92576 | 2008-04-17 17:40:45 +0200 | [diff] [blame] | 530 | } |
| 531 | |
Yinghai Lu | b50efd2 | 2008-07-08 01:41:05 -0700 | [diff] [blame] | 532 | if (page_size_mask & (1<<PG_LEVEL_1G)) { |
Andi Kleen | ce0c0e5 | 2008-05-02 11:46:49 +0200 | [diff] [blame] | 533 | pages++; |
Jan Beulich | 8ae3a5a | 2008-08-21 14:27:22 +0100 | [diff] [blame] | 534 | spin_lock(&init_mm.page_table_lock); |
Andi Kleen | ef92576 | 2008-04-17 17:40:45 +0200 | [diff] [blame] | 535 | set_pte((pte_t *)pud, |
| 536 | pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL_LARGE)); |
Jan Beulich | 8ae3a5a | 2008-08-21 14:27:22 +0100 | [diff] [blame] | 537 | spin_unlock(&init_mm.page_table_lock); |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 538 | last_map_addr = (addr & PUD_MASK) + PUD_SIZE; |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 539 | continue; |
| 540 | } |
| 541 | |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 542 | pmd = alloc_low_page(&pmd_phys); |
Suresh Siddha | b27a43c | 2008-10-07 13:58:46 -0700 | [diff] [blame] | 543 | last_map_addr = phys_pmd_init(pmd, addr, end, page_size_mask, |
| 544 | prot); |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 545 | unmap_low_page(pmd); |
Jan Beulich | 8ae3a5a | 2008-08-21 14:27:22 +0100 | [diff] [blame] | 546 | |
| 547 | spin_lock(&init_mm.page_table_lock); |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 548 | pud_populate(&init_mm, pud, __va(pmd_phys)); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 549 | spin_unlock(&init_mm.page_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | } |
Andi Kleen | 1a2b441 | 2008-01-30 13:33:54 +0100 | [diff] [blame] | 551 | __flush_tlb_all(); |
Suresh Siddha | a2699e4 | 2008-09-23 14:00:38 -0700 | [diff] [blame] | 552 | |
Andi Kleen | ce0c0e5 | 2008-05-02 11:46:49 +0200 | [diff] [blame] | 553 | update_page_count(PG_LEVEL_1G, pages); |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 554 | |
Yinghai Lu | 1a0db38 | 2008-06-24 14:56:20 -0700 | [diff] [blame] | 555 | return last_map_addr; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 556 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 558 | static unsigned long __meminit |
Yinghai Lu | b50efd2 | 2008-07-08 01:41:05 -0700 | [diff] [blame] | 559 | phys_pud_update(pgd_t *pgd, unsigned long addr, unsigned long end, |
| 560 | unsigned long page_size_mask) |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 561 | { |
| 562 | pud_t *pud; |
| 563 | |
| 564 | pud = (pud_t *)pgd_page_vaddr(*pgd); |
| 565 | |
Yinghai Lu | b50efd2 | 2008-07-08 01:41:05 -0700 | [diff] [blame] | 566 | return phys_pud_init(pud, addr, end, page_size_mask); |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 567 | } |
| 568 | |
Suresh Siddha | 0b8fdcb | 2008-09-23 14:00:39 -0700 | [diff] [blame] | 569 | static void __init find_early_table_space(unsigned long end, int use_pse, |
| 570 | int use_gbpages) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | { |
Yinghai Lu | c2e6d65 | 2008-07-08 01:43:27 -0700 | [diff] [blame] | 572 | unsigned long puds, pmds, ptes, tables, start; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | |
| 574 | puds = (end + PUD_SIZE - 1) >> PUD_SHIFT; |
Joerg Roedel | d86bb0d | 2008-07-25 16:48:57 +0200 | [diff] [blame] | 575 | tables = roundup(puds * sizeof(pud_t), PAGE_SIZE); |
Suresh Siddha | 0b8fdcb | 2008-09-23 14:00:39 -0700 | [diff] [blame] | 576 | if (use_gbpages) { |
Yinghai Lu | c2e6d65 | 2008-07-08 01:43:27 -0700 | [diff] [blame] | 577 | unsigned long extra; |
| 578 | extra = end - ((end>>PUD_SHIFT) << PUD_SHIFT); |
| 579 | pmds = (extra + PMD_SIZE - 1) >> PMD_SHIFT; |
| 580 | } else |
| 581 | pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT; |
Joerg Roedel | d86bb0d | 2008-07-25 16:48:57 +0200 | [diff] [blame] | 582 | tables += roundup(pmds * sizeof(pmd_t), PAGE_SIZE); |
Yinghai Lu | c2e6d65 | 2008-07-08 01:43:27 -0700 | [diff] [blame] | 583 | |
Suresh Siddha | 0b8fdcb | 2008-09-23 14:00:39 -0700 | [diff] [blame] | 584 | if (use_pse) { |
Yinghai Lu | c2e6d65 | 2008-07-08 01:43:27 -0700 | [diff] [blame] | 585 | unsigned long extra; |
| 586 | extra = end - ((end>>PMD_SHIFT) << PMD_SHIFT); |
| 587 | ptes = (extra + PAGE_SIZE - 1) >> PAGE_SHIFT; |
| 588 | } else |
| 589 | ptes = (end + PAGE_SIZE - 1) >> PAGE_SHIFT; |
Joerg Roedel | d86bb0d | 2008-07-25 16:48:57 +0200 | [diff] [blame] | 590 | tables += roundup(ptes * sizeof(pte_t), PAGE_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 592 | /* |
| 593 | * RED-PEN putting page tables only on node 0 could |
| 594 | * cause a hotspot and fill up ZONE_DMA. The page tables |
| 595 | * need roughly 0.5KB per GB. |
| 596 | */ |
| 597 | start = 0x8000; |
Yinghai Lu | 24a5da7 | 2008-02-01 17:49:41 +0100 | [diff] [blame] | 598 | table_start = find_e820_area(start, end, tables, PAGE_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | if (table_start == -1UL) |
| 600 | panic("Cannot find space for the kernel page tables"); |
| 601 | |
| 602 | table_start >>= PAGE_SHIFT; |
| 603 | table_end = table_start; |
Yinghai Lu | d86623a | 2008-06-24 14:57:29 -0700 | [diff] [blame] | 604 | table_top = table_start + (tables >> PAGE_SHIFT); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 605 | |
Yinghai Lu | d86623a | 2008-06-24 14:57:29 -0700 | [diff] [blame] | 606 | printk(KERN_DEBUG "kernel direct mapping tables up to %lx @ %lx-%lx\n", |
| 607 | end, table_start << PAGE_SHIFT, table_top << PAGE_SHIFT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | } |
| 609 | |
Andi Kleen | ef92576 | 2008-04-17 17:40:45 +0200 | [diff] [blame] | 610 | static void __init init_gbpages(void) |
| 611 | { |
| 612 | if (direct_gbpages && cpu_has_gbpages) |
| 613 | printk(KERN_INFO "Using GB pages for direct mapping\n"); |
| 614 | else |
| 615 | direct_gbpages = 0; |
| 616 | } |
| 617 | |
Gary Hade | f549550 | 2009-01-19 13:46:41 -0800 | [diff] [blame] | 618 | static unsigned long __meminit kernel_physical_mapping_init(unsigned long start, |
Yinghai Lu | b50efd2 | 2008-07-08 01:41:05 -0700 | [diff] [blame] | 619 | unsigned long end, |
| 620 | unsigned long page_size_mask) |
| 621 | { |
| 622 | |
| 623 | unsigned long next, last_map_addr = end; |
| 624 | |
| 625 | start = (unsigned long)__va(start); |
| 626 | end = (unsigned long)__va(end); |
| 627 | |
| 628 | for (; start < end; start = next) { |
| 629 | pgd_t *pgd = pgd_offset_k(start); |
| 630 | unsigned long pud_phys; |
| 631 | pud_t *pud; |
| 632 | |
Jack Steiner | e22146e | 2008-07-16 11:11:59 -0500 | [diff] [blame] | 633 | next = (start + PGDIR_SIZE) & PGDIR_MASK; |
Yinghai Lu | b50efd2 | 2008-07-08 01:41:05 -0700 | [diff] [blame] | 634 | if (next > end) |
| 635 | next = end; |
| 636 | |
| 637 | if (pgd_val(*pgd)) { |
| 638 | last_map_addr = phys_pud_update(pgd, __pa(start), |
| 639 | __pa(end), page_size_mask); |
| 640 | continue; |
| 641 | } |
| 642 | |
Jan Beulich | 8ae3a5a | 2008-08-21 14:27:22 +0100 | [diff] [blame] | 643 | pud = alloc_low_page(&pud_phys); |
Yinghai Lu | b50efd2 | 2008-07-08 01:41:05 -0700 | [diff] [blame] | 644 | last_map_addr = phys_pud_init(pud, __pa(start), __pa(next), |
| 645 | page_size_mask); |
| 646 | unmap_low_page(pud); |
Jan Beulich | 8ae3a5a | 2008-08-21 14:27:22 +0100 | [diff] [blame] | 647 | |
| 648 | spin_lock(&init_mm.page_table_lock); |
| 649 | pgd_populate(&init_mm, pgd, __va(pud_phys)); |
| 650 | spin_unlock(&init_mm.page_table_lock); |
Yinghai Lu | b50efd2 | 2008-07-08 01:41:05 -0700 | [diff] [blame] | 651 | } |
Suresh Siddha | a2699e4 | 2008-09-23 14:00:38 -0700 | [diff] [blame] | 652 | __flush_tlb_all(); |
Yinghai Lu | b50efd2 | 2008-07-08 01:41:05 -0700 | [diff] [blame] | 653 | |
| 654 | return last_map_addr; |
| 655 | } |
Yinghai Lu | 7b16eb8 | 2008-07-09 20:15:02 -0700 | [diff] [blame] | 656 | |
| 657 | struct map_range { |
| 658 | unsigned long start; |
| 659 | unsigned long end; |
| 660 | unsigned page_size_mask; |
| 661 | }; |
| 662 | |
| 663 | #define NR_RANGE_MR 5 |
| 664 | |
| 665 | static int save_mr(struct map_range *mr, int nr_range, |
| 666 | unsigned long start_pfn, unsigned long end_pfn, |
| 667 | unsigned long page_size_mask) |
| 668 | { |
| 669 | |
| 670 | if (start_pfn < end_pfn) { |
| 671 | if (nr_range >= NR_RANGE_MR) |
| 672 | panic("run out of range for init_memory_mapping\n"); |
| 673 | mr[nr_range].start = start_pfn<<PAGE_SHIFT; |
| 674 | mr[nr_range].end = end_pfn<<PAGE_SHIFT; |
| 675 | mr[nr_range].page_size_mask = page_size_mask; |
| 676 | nr_range++; |
| 677 | } |
| 678 | |
| 679 | return nr_range; |
| 680 | } |
| 681 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 682 | /* |
| 683 | * Setup the direct mapping of the physical memory at PAGE_OFFSET. |
| 684 | * This runs before bootmem is initialized and gets pages directly from |
| 685 | * the physical memory. To access them they are temporarily mapped. |
| 686 | */ |
Yinghai Lu | b50efd2 | 2008-07-08 01:41:05 -0700 | [diff] [blame] | 687 | unsigned long __init_refok init_memory_mapping(unsigned long start, |
| 688 | unsigned long end) |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 689 | { |
Yinghai Lu | 7b16eb8 | 2008-07-09 20:15:02 -0700 | [diff] [blame] | 690 | unsigned long last_map_addr = 0; |
Yinghai Lu | b50efd2 | 2008-07-08 01:41:05 -0700 | [diff] [blame] | 691 | unsigned long page_size_mask = 0; |
Yinghai Lu | c2e6d65 | 2008-07-08 01:43:27 -0700 | [diff] [blame] | 692 | unsigned long start_pfn, end_pfn; |
Yinghai Lu | f96f57d | 2008-10-28 12:39:23 -0700 | [diff] [blame] | 693 | unsigned long pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 694 | |
Yinghai Lu | 7b16eb8 | 2008-07-09 20:15:02 -0700 | [diff] [blame] | 695 | struct map_range mr[NR_RANGE_MR]; |
| 696 | int nr_range, i; |
Suresh Siddha | 0b8fdcb | 2008-09-23 14:00:39 -0700 | [diff] [blame] | 697 | int use_pse, use_gbpages; |
Yinghai Lu | 7b16eb8 | 2008-07-09 20:15:02 -0700 | [diff] [blame] | 698 | |
Yinghai Lu | f96f57d | 2008-10-28 12:39:23 -0700 | [diff] [blame] | 699 | printk(KERN_INFO "init_memory_mapping: %016lx-%016lx\n", start, end); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 701 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | * Find space for the kernel direct mapping tables. |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 703 | * |
| 704 | * Later we should allocate these tables in the local node of the |
| 705 | * memory mapped. Unfortunately this is done currently before the |
| 706 | * nodes are discovered. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | */ |
Yinghai Lu | 7b16eb8 | 2008-07-09 20:15:02 -0700 | [diff] [blame] | 708 | if (!after_bootmem) |
Andi Kleen | ef92576 | 2008-04-17 17:40:45 +0200 | [diff] [blame] | 709 | init_gbpages(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | |
Suresh Siddha | 0b8fdcb | 2008-09-23 14:00:39 -0700 | [diff] [blame] | 711 | #ifdef CONFIG_DEBUG_PAGEALLOC |
| 712 | /* |
| 713 | * For CONFIG_DEBUG_PAGEALLOC, identity mapping will use small pages. |
| 714 | * This will simplify cpa(), which otherwise needs to support splitting |
| 715 | * large pages into small in interrupt context, etc. |
| 716 | */ |
| 717 | use_pse = use_gbpages = 0; |
| 718 | #else |
| 719 | use_pse = cpu_has_pse; |
| 720 | use_gbpages = direct_gbpages; |
| 721 | #endif |
| 722 | |
| 723 | if (use_gbpages) |
Yinghai Lu | b50efd2 | 2008-07-08 01:41:05 -0700 | [diff] [blame] | 724 | page_size_mask |= 1 << PG_LEVEL_1G; |
Suresh Siddha | 0b8fdcb | 2008-09-23 14:00:39 -0700 | [diff] [blame] | 725 | if (use_pse) |
Yinghai Lu | b50efd2 | 2008-07-08 01:41:05 -0700 | [diff] [blame] | 726 | page_size_mask |= 1 << PG_LEVEL_2M; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | |
Yinghai Lu | 7b16eb8 | 2008-07-09 20:15:02 -0700 | [diff] [blame] | 728 | memset(mr, 0, sizeof(mr)); |
| 729 | nr_range = 0; |
| 730 | |
| 731 | /* head if not big page alignment ?*/ |
Yinghai Lu | c2e6d65 | 2008-07-08 01:43:27 -0700 | [diff] [blame] | 732 | start_pfn = start >> PAGE_SHIFT; |
Yinghai Lu | f96f57d | 2008-10-28 12:39:23 -0700 | [diff] [blame] | 733 | pos = start_pfn << PAGE_SHIFT; |
| 734 | end_pfn = ((pos + (PMD_SIZE - 1)) >> PMD_SHIFT) |
Yinghai Lu | c2e6d65 | 2008-07-08 01:43:27 -0700 | [diff] [blame] | 735 | << (PMD_SHIFT - PAGE_SHIFT); |
Yinghai Lu | f96f57d | 2008-10-28 12:39:23 -0700 | [diff] [blame] | 736 | if (start_pfn < end_pfn) { |
| 737 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0); |
| 738 | pos = end_pfn << PAGE_SHIFT; |
| 739 | } |
Yinghai Lu | c2e6d65 | 2008-07-08 01:43:27 -0700 | [diff] [blame] | 740 | |
| 741 | /* big page (2M) range*/ |
Yinghai Lu | f96f57d | 2008-10-28 12:39:23 -0700 | [diff] [blame] | 742 | start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT) |
Yinghai Lu | c2e6d65 | 2008-07-08 01:43:27 -0700 | [diff] [blame] | 743 | << (PMD_SHIFT - PAGE_SHIFT); |
Yinghai Lu | f96f57d | 2008-10-28 12:39:23 -0700 | [diff] [blame] | 744 | end_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT) |
Yinghai Lu | c2e6d65 | 2008-07-08 01:43:27 -0700 | [diff] [blame] | 745 | << (PUD_SHIFT - PAGE_SHIFT); |
Yinghai Lu | f96f57d | 2008-10-28 12:39:23 -0700 | [diff] [blame] | 746 | if (end_pfn > ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT))) |
| 747 | end_pfn = ((end>>PMD_SHIFT)<<(PMD_SHIFT - PAGE_SHIFT)); |
| 748 | if (start_pfn < end_pfn) { |
| 749 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, |
| 750 | page_size_mask & (1<<PG_LEVEL_2M)); |
| 751 | pos = end_pfn << PAGE_SHIFT; |
| 752 | } |
Yinghai Lu | c2e6d65 | 2008-07-08 01:43:27 -0700 | [diff] [blame] | 753 | |
| 754 | /* big page (1G) range */ |
Yinghai Lu | f96f57d | 2008-10-28 12:39:23 -0700 | [diff] [blame] | 755 | start_pfn = ((pos + (PUD_SIZE - 1))>>PUD_SHIFT) |
| 756 | << (PUD_SHIFT - PAGE_SHIFT); |
| 757 | end_pfn = (end >> PUD_SHIFT) << (PUD_SHIFT - PAGE_SHIFT); |
| 758 | if (start_pfn < end_pfn) { |
| 759 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, |
Yinghai Lu | 7b16eb8 | 2008-07-09 20:15:02 -0700 | [diff] [blame] | 760 | page_size_mask & |
| 761 | ((1<<PG_LEVEL_2M)|(1<<PG_LEVEL_1G))); |
Yinghai Lu | f96f57d | 2008-10-28 12:39:23 -0700 | [diff] [blame] | 762 | pos = end_pfn << PAGE_SHIFT; |
| 763 | } |
Yinghai Lu | c2e6d65 | 2008-07-08 01:43:27 -0700 | [diff] [blame] | 764 | |
| 765 | /* tail is not big page (1G) alignment */ |
Yinghai Lu | f96f57d | 2008-10-28 12:39:23 -0700 | [diff] [blame] | 766 | start_pfn = ((pos + (PMD_SIZE - 1))>>PMD_SHIFT) |
| 767 | << (PMD_SHIFT - PAGE_SHIFT); |
| 768 | end_pfn = (end >> PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT); |
| 769 | if (start_pfn < end_pfn) { |
| 770 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, |
| 771 | page_size_mask & (1<<PG_LEVEL_2M)); |
| 772 | pos = end_pfn << PAGE_SHIFT; |
| 773 | } |
Yinghai Lu | 7b16eb8 | 2008-07-09 20:15:02 -0700 | [diff] [blame] | 774 | |
Yinghai Lu | c2e6d65 | 2008-07-08 01:43:27 -0700 | [diff] [blame] | 775 | /* tail is not big page (2M) alignment */ |
Yinghai Lu | f96f57d | 2008-10-28 12:39:23 -0700 | [diff] [blame] | 776 | start_pfn = pos>>PAGE_SHIFT; |
Yinghai Lu | c2e6d65 | 2008-07-08 01:43:27 -0700 | [diff] [blame] | 777 | end_pfn = end>>PAGE_SHIFT; |
Yinghai Lu | 7b16eb8 | 2008-07-09 20:15:02 -0700 | [diff] [blame] | 778 | nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0); |
| 779 | |
Yinghai Lu | 9958e81 | 2008-07-12 14:32:45 -0700 | [diff] [blame] | 780 | /* try to merge same page size and continuous */ |
| 781 | for (i = 0; nr_range > 1 && i < nr_range - 1; i++) { |
| 782 | unsigned long old_start; |
| 783 | if (mr[i].end != mr[i+1].start || |
| 784 | mr[i].page_size_mask != mr[i+1].page_size_mask) |
| 785 | continue; |
| 786 | /* move it */ |
| 787 | old_start = mr[i].start; |
| 788 | memmove(&mr[i], &mr[i+1], |
| 789 | (nr_range - 1 - i) * sizeof (struct map_range)); |
Jan Beulich | 5e72d9e | 2008-09-12 15:43:04 +0100 | [diff] [blame] | 790 | mr[i--].start = old_start; |
Yinghai Lu | 9958e81 | 2008-07-12 14:32:45 -0700 | [diff] [blame] | 791 | nr_range--; |
| 792 | } |
| 793 | |
Yinghai Lu | 7b16eb8 | 2008-07-09 20:15:02 -0700 | [diff] [blame] | 794 | for (i = 0; i < nr_range; i++) |
| 795 | printk(KERN_DEBUG " %010lx - %010lx page %s\n", |
| 796 | mr[i].start, mr[i].end, |
| 797 | (mr[i].page_size_mask & (1<<PG_LEVEL_1G))?"1G":( |
| 798 | (mr[i].page_size_mask & (1<<PG_LEVEL_2M))?"2M":"4k")); |
| 799 | |
| 800 | if (!after_bootmem) |
Suresh Siddha | 0b8fdcb | 2008-09-23 14:00:39 -0700 | [diff] [blame] | 801 | find_early_table_space(end, use_pse, use_gbpages); |
Yinghai Lu | 7b16eb8 | 2008-07-09 20:15:02 -0700 | [diff] [blame] | 802 | |
| 803 | for (i = 0; i < nr_range; i++) |
Yinghai Lu | c2e6d65 | 2008-07-08 01:43:27 -0700 | [diff] [blame] | 804 | last_map_addr = kernel_physical_mapping_init( |
Yinghai Lu | 7b16eb8 | 2008-07-09 20:15:02 -0700 | [diff] [blame] | 805 | mr[i].start, mr[i].end, |
| 806 | mr[i].page_size_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 808 | if (!after_bootmem) |
Glauber de Oliveira Costa | f51c945 | 2007-07-22 11:12:29 +0200 | [diff] [blame] | 809 | mmu_cr4_features = read_cr4(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | __flush_tlb_all(); |
Andi Kleen | 7517527 | 2008-01-30 13:33:17 +0100 | [diff] [blame] | 811 | |
Yinghai Lu | b50efd2 | 2008-07-08 01:41:05 -0700 | [diff] [blame] | 812 | if (!after_bootmem && table_end > table_start) |
Yinghai Lu | 24a5da7 | 2008-02-01 17:49:41 +0100 | [diff] [blame] | 813 | reserve_early(table_start << PAGE_SHIFT, |
| 814 | table_end << PAGE_SHIFT, "PGTABLE"); |
Yinghai Lu | 272b9ca | 2008-03-20 23:58:33 -0700 | [diff] [blame] | 815 | |
Yinghai Lu | b50efd2 | 2008-07-08 01:41:05 -0700 | [diff] [blame] | 816 | printk(KERN_INFO "last_map_addr: %lx end: %lx\n", |
| 817 | last_map_addr, end); |
| 818 | |
Yinghai Lu | 272b9ca | 2008-03-20 23:58:33 -0700 | [diff] [blame] | 819 | if (!after_bootmem) |
Yinghai Lu | b50efd2 | 2008-07-08 01:41:05 -0700 | [diff] [blame] | 820 | early_memtest(start, end); |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 821 | |
Yinghai Lu | 1a0db38 | 2008-06-24 14:56:20 -0700 | [diff] [blame] | 822 | return last_map_addr >> PAGE_SHIFT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 823 | } |
| 824 | |
Matt Tolentino | 2b97690 | 2005-06-23 00:08:06 -0700 | [diff] [blame] | 825 | #ifndef CONFIG_NUMA |
Yinghai Lu | 1f75d7e | 2008-06-22 02:44:49 -0700 | [diff] [blame] | 826 | void __init initmem_init(unsigned long start_pfn, unsigned long end_pfn) |
| 827 | { |
| 828 | unsigned long bootmap_size, bootmap; |
| 829 | |
| 830 | bootmap_size = bootmem_bootmap_pages(end_pfn)<<PAGE_SHIFT; |
| 831 | bootmap = find_e820_area(0, end_pfn<<PAGE_SHIFT, bootmap_size, |
| 832 | PAGE_SIZE); |
| 833 | if (bootmap == -1L) |
| 834 | panic("Cannot find bootmem map of size %ld\n", bootmap_size); |
Yinghai Lu | 346cafe | 2008-06-23 03:06:14 -0700 | [diff] [blame] | 835 | /* don't touch min_low_pfn */ |
| 836 | bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap >> PAGE_SHIFT, |
| 837 | 0, end_pfn); |
Yinghai Lu | 1f75d7e | 2008-06-22 02:44:49 -0700 | [diff] [blame] | 838 | e820_register_active_regions(0, start_pfn, end_pfn); |
| 839 | free_bootmem_with_active_regions(0, end_pfn); |
| 840 | early_res_to_bootmem(0, end_pfn<<PAGE_SHIFT); |
| 841 | reserve_bootmem(bootmap, bootmap_size, BOOTMEM_DEFAULT); |
| 842 | } |
| 843 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | void __init paging_init(void) |
| 845 | { |
Mel Gorman | 6391af1 | 2006-10-11 01:20:39 -0700 | [diff] [blame] | 846 | unsigned long max_zone_pfns[MAX_NR_ZONES]; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 847 | |
Mel Gorman | 6391af1 | 2006-10-11 01:20:39 -0700 | [diff] [blame] | 848 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); |
| 849 | max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN; |
| 850 | max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN; |
Yinghai Lu | c987d12 | 2008-06-24 22:14:09 -0700 | [diff] [blame] | 851 | max_zone_pfns[ZONE_NORMAL] = max_pfn; |
Mel Gorman | 6391af1 | 2006-10-11 01:20:39 -0700 | [diff] [blame] | 852 | |
Yinghai Lu | c987d12 | 2008-06-24 22:14:09 -0700 | [diff] [blame] | 853 | memory_present(0, 0, max_pfn); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 854 | sparse_init(); |
Mel Gorman | 5cb248a | 2006-09-27 01:49:52 -0700 | [diff] [blame] | 855 | free_area_init_nodes(max_zone_pfns); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | } |
| 857 | #endif |
| 858 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 859 | /* |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 860 | * Memory hotplug specific functions |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 861 | */ |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 862 | #ifdef CONFIG_MEMORY_HOTPLUG |
| 863 | /* |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 864 | * Memory is added always to NORMAL zone. This means you will never get |
| 865 | * additional DMA/DMA32 memory. |
| 866 | */ |
| 867 | int arch_add_memory(int nid, u64 start, u64 size) |
| 868 | { |
| 869 | struct pglist_data *pgdat = NODE_DATA(nid); |
Christoph Lameter | 776ed98 | 2006-09-25 23:31:09 -0700 | [diff] [blame] | 870 | struct zone *zone = pgdat->node_zones + ZONE_NORMAL; |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 871 | unsigned long last_mapped_pfn, start_pfn = start >> PAGE_SHIFT; |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 872 | unsigned long nr_pages = size >> PAGE_SHIFT; |
| 873 | int ret; |
| 874 | |
Shaohua Li | 60817c9 | 2008-10-27 13:03:18 -0700 | [diff] [blame] | 875 | last_mapped_pfn = init_memory_mapping(start, start + size); |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 876 | if (last_mapped_pfn > max_pfn_mapped) |
| 877 | max_pfn_mapped = last_mapped_pfn; |
Keith Mannthey | 45e0b78 | 2006-09-30 23:27:09 -0700 | [diff] [blame] | 878 | |
Gary Hade | c04fc58 | 2009-01-06 14:39:14 -0800 | [diff] [blame] | 879 | ret = __add_pages(nid, zone, start_pfn, nr_pages); |
Gary Hade | fe8b868 | 2008-10-28 16:43:14 -0700 | [diff] [blame] | 880 | WARN_ON_ONCE(ret); |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 881 | |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 882 | return ret; |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 883 | } |
| 884 | EXPORT_SYMBOL_GPL(arch_add_memory); |
| 885 | |
Yasunori Goto | 8243229 | 2006-11-18 22:19:40 -0800 | [diff] [blame] | 886 | #if !defined(CONFIG_ACPI_NUMA) && defined(CONFIG_NUMA) |
Keith Mannthey | 4942e99 | 2006-09-30 23:27:06 -0700 | [diff] [blame] | 887 | int memory_add_physaddr_to_nid(u64 start) |
| 888 | { |
| 889 | return 0; |
| 890 | } |
Keith Mannthey | 8c2676a | 2006-09-30 23:27:07 -0700 | [diff] [blame] | 891 | EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid); |
Keith Mannthey | 4942e99 | 2006-09-30 23:27:06 -0700 | [diff] [blame] | 892 | #endif |
| 893 | |
Keith Mannthey | 45e0b78 | 2006-09-30 23:27:09 -0700 | [diff] [blame] | 894 | #endif /* CONFIG_MEMORY_HOTPLUG */ |
| 895 | |
Arjan van de Ven | ae531c2 | 2008-04-24 23:40:47 +0200 | [diff] [blame] | 896 | /* |
| 897 | * devmem_is_allowed() checks to see if /dev/mem access to a certain address |
| 898 | * is valid. The argument is a physical page number. |
| 899 | * |
| 900 | * |
| 901 | * On x86, access has to be given to the first megabyte of ram because that area |
| 902 | * contains bios code and data regions used by X and dosemu and similar apps. |
| 903 | * Access has to be given to non-kernel-ram areas as well, these contain the PCI |
| 904 | * mmio resources as well as potential bios/acpi data regions. |
| 905 | */ |
| 906 | int devmem_is_allowed(unsigned long pagenr) |
| 907 | { |
| 908 | if (pagenr <= 256) |
| 909 | return 1; |
Arjan van de Ven | e8de148 | 2008-10-22 19:55:31 -0700 | [diff] [blame] | 910 | if (iomem_is_exclusive(pagenr << PAGE_SHIFT)) |
| 911 | return 0; |
Arjan van de Ven | ae531c2 | 2008-04-24 23:40:47 +0200 | [diff] [blame] | 912 | if (!page_is_ram(pagenr)) |
| 913 | return 1; |
| 914 | return 0; |
| 915 | } |
| 916 | |
| 917 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 918 | static struct kcore_list kcore_mem, kcore_vmalloc, kcore_kernel, |
| 919 | kcore_modules, kcore_vsyscall; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 920 | |
| 921 | void __init mem_init(void) |
| 922 | { |
Andi Kleen | 0a43e4b | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 923 | long codesize, reservedpages, datasize, initsize; |
Yinghai Lu | 11a6b0c | 2008-10-14 18:59:18 -0700 | [diff] [blame] | 924 | unsigned long absent_pages; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 925 | |
Jon Mason | 0dc243a | 2006-06-26 13:58:11 +0200 | [diff] [blame] | 926 | pci_iommu_alloc(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | |
Yinghai Lu | 48ddb15 | 2008-01-30 13:32:36 +0100 | [diff] [blame] | 928 | /* clear_bss() already clear the empty_zero_page */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 929 | |
| 930 | reservedpages = 0; |
| 931 | |
| 932 | /* this will put all low memory onto the freelists */ |
Matt Tolentino | 2b97690 | 2005-06-23 00:08:06 -0700 | [diff] [blame] | 933 | #ifdef CONFIG_NUMA |
Andi Kleen | 0a43e4b | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 934 | totalram_pages = numa_free_all_bootmem(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 935 | #else |
Andi Kleen | 0a43e4b | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 936 | totalram_pages = free_all_bootmem(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 937 | #endif |
Yinghai Lu | 11a6b0c | 2008-10-14 18:59:18 -0700 | [diff] [blame] | 938 | |
| 939 | absent_pages = absent_pages_in_range(0, max_pfn); |
| 940 | reservedpages = max_pfn - totalram_pages - absent_pages; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 941 | after_bootmem = 1; |
| 942 | |
| 943 | codesize = (unsigned long) &_etext - (unsigned long) &_text; |
| 944 | datasize = (unsigned long) &_edata - (unsigned long) &_etext; |
| 945 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; |
| 946 | |
| 947 | /* Register memory areas for /proc/kcore */ |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 948 | kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT); |
| 949 | kclist_add(&kcore_vmalloc, (void *)VMALLOC_START, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 950 | VMALLOC_END-VMALLOC_START); |
| 951 | kclist_add(&kcore_kernel, &_stext, _end - _stext); |
| 952 | kclist_add(&kcore_modules, (void *)MODULES_VADDR, MODULES_LEN); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 953 | kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | VSYSCALL_END - VSYSCALL_START); |
| 955 | |
Ingo Molnar | 10f22dd | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 956 | printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, " |
Yinghai Lu | 11a6b0c | 2008-10-14 18:59:18 -0700 | [diff] [blame] | 957 | "%ldk absent, %ldk reserved, %ldk data, %ldk init)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 958 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), |
Yinghai Lu | c987d12 | 2008-06-24 22:14:09 -0700 | [diff] [blame] | 959 | max_pfn << (PAGE_SHIFT-10), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | codesize >> 10, |
Yinghai Lu | 11a6b0c | 2008-10-14 18:59:18 -0700 | [diff] [blame] | 961 | absent_pages << (PAGE_SHIFT-10), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 962 | reservedpages << (PAGE_SHIFT-10), |
| 963 | datasize >> 10, |
| 964 | initsize >> 10); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 965 | } |
| 966 | |
Gerd Hoffmann | d167a51 | 2006-06-26 13:56:16 +0200 | [diff] [blame] | 967 | void free_init_pages(char *what, unsigned long begin, unsigned long end) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 968 | { |
Thomas Gleixner | bfc734b | 2008-02-09 23:24:09 +0100 | [diff] [blame] | 969 | unsigned long addr = begin; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | |
Thomas Gleixner | bfc734b | 2008-02-09 23:24:09 +0100 | [diff] [blame] | 971 | if (addr >= end) |
Gerd Hoffmann | d167a51 | 2006-06-26 13:56:16 +0200 | [diff] [blame] | 972 | return; |
| 973 | |
Ingo Molnar | ee01f11 | 2008-01-30 13:34:09 +0100 | [diff] [blame] | 974 | /* |
| 975 | * If debugging page accesses then do not free this memory but |
| 976 | * mark them not present - any buggy init-section access will |
| 977 | * create a kernel page fault: |
| 978 | */ |
| 979 | #ifdef CONFIG_DEBUG_PAGEALLOC |
| 980 | printk(KERN_INFO "debug: unmapping init memory %08lx..%08lx\n", |
| 981 | begin, PAGE_ALIGN(end)); |
| 982 | set_memory_np(begin, (end - begin) >> PAGE_SHIFT); |
| 983 | #else |
Jan Beulich | 6fb1475 | 2007-05-02 19:27:10 +0200 | [diff] [blame] | 984 | printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 985 | |
Thomas Gleixner | bfc734b | 2008-02-09 23:24:09 +0100 | [diff] [blame] | 986 | for (; addr < end; addr += PAGE_SIZE) { |
Linus Torvalds | e3ebadd | 2007-05-07 08:44:24 -0700 | [diff] [blame] | 987 | ClearPageReserved(virt_to_page(addr)); |
| 988 | init_page_count(virt_to_page(addr)); |
| 989 | memset((void *)(addr & ~(PAGE_SIZE-1)), |
| 990 | POISON_FREE_INITMEM, PAGE_SIZE); |
Linus Torvalds | e3ebadd | 2007-05-07 08:44:24 -0700 | [diff] [blame] | 991 | free_page(addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 992 | totalram_pages++; |
| 993 | } |
Ingo Molnar | ee01f11 | 2008-01-30 13:34:09 +0100 | [diff] [blame] | 994 | #endif |
Gerd Hoffmann | d167a51 | 2006-06-26 13:56:16 +0200 | [diff] [blame] | 995 | } |
| 996 | |
| 997 | void free_initmem(void) |
| 998 | { |
Gerd Hoffmann | d167a51 | 2006-06-26 13:56:16 +0200 | [diff] [blame] | 999 | free_init_pages("unused kernel memory", |
Linus Torvalds | e3ebadd | 2007-05-07 08:44:24 -0700 | [diff] [blame] | 1000 | (unsigned long)(&__init_begin), |
| 1001 | (unsigned long)(&__init_end)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1002 | } |
| 1003 | |
Arjan van de Ven | 67df197 | 2006-01-06 00:12:04 -0800 | [diff] [blame] | 1004 | #ifdef CONFIG_DEBUG_RODATA |
Arjan van de Ven | edeed30 | 2008-01-30 13:34:08 +0100 | [diff] [blame] | 1005 | const int rodata_test_data = 0xC3; |
| 1006 | EXPORT_SYMBOL_GPL(rodata_test_data); |
Arjan van de Ven | 67df197 | 2006-01-06 00:12:04 -0800 | [diff] [blame] | 1007 | |
Arjan van de Ven | 67df197 | 2006-01-06 00:12:04 -0800 | [diff] [blame] | 1008 | void mark_rodata_ro(void) |
| 1009 | { |
Mathieu Desnoyers | 4e4eee0 | 2008-02-02 15:42:20 -0500 | [diff] [blame] | 1010 | unsigned long start = PFN_ALIGN(_stext), end = PFN_ALIGN(__end_rodata); |
Steven Rostedt | 8f0f996 | 2008-05-12 21:20:56 +0200 | [diff] [blame] | 1011 | unsigned long rodata_start = |
| 1012 | ((unsigned long)__start_rodata + PAGE_SIZE - 1) & PAGE_MASK; |
| 1013 | |
| 1014 | #ifdef CONFIG_DYNAMIC_FTRACE |
| 1015 | /* Dynamic tracing modifies the kernel text section */ |
| 1016 | start = rodata_start; |
| 1017 | #endif |
Arjan van de Ven | 67df197 | 2006-01-06 00:12:04 -0800 | [diff] [blame] | 1018 | |
Jan Beulich | 6fb1475 | 2007-05-02 19:27:10 +0200 | [diff] [blame] | 1019 | printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n", |
Linus Torvalds | e3ebadd | 2007-05-07 08:44:24 -0700 | [diff] [blame] | 1020 | (end - start) >> 10); |
Arjan van de Ven | 984bb80 | 2008-02-06 22:39:45 +0100 | [diff] [blame] | 1021 | set_memory_ro(start, (end - start) >> PAGE_SHIFT); |
| 1022 | |
| 1023 | /* |
| 1024 | * The rodata section (but not the kernel text!) should also be |
| 1025 | * not-executable. |
| 1026 | */ |
Pekka Paalanen | 72b59d67 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 1027 | set_memory_nx(rodata_start, (end - rodata_start) >> PAGE_SHIFT); |
Arjan van de Ven | 67df197 | 2006-01-06 00:12:04 -0800 | [diff] [blame] | 1028 | |
Arjan van de Ven | 1a48725 | 2008-01-30 13:34:09 +0100 | [diff] [blame] | 1029 | rodata_test(); |
| 1030 | |
Andi Kleen | 0c42f39 | 2008-01-30 13:33:42 +0100 | [diff] [blame] | 1031 | #ifdef CONFIG_CPA_DEBUG |
Ingo Molnar | 10f22dd | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1032 | 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] | 1033 | set_memory_rw(start, (end-start) >> PAGE_SHIFT); |
Andi Kleen | 0c42f39 | 2008-01-30 13:33:42 +0100 | [diff] [blame] | 1034 | |
Ingo Molnar | 10f22dd | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1035 | printk(KERN_INFO "Testing CPA: again\n"); |
Arjan van de Ven | 6d238cc | 2008-01-30 13:34:06 +0100 | [diff] [blame] | 1036 | set_memory_ro(start, (end-start) >> PAGE_SHIFT); |
Andi Kleen | 0c42f39 | 2008-01-30 13:33:42 +0100 | [diff] [blame] | 1037 | #endif |
Arjan van de Ven | 67df197 | 2006-01-06 00:12:04 -0800 | [diff] [blame] | 1038 | } |
Mathieu Desnoyers | 4e4eee0 | 2008-02-02 15:42:20 -0500 | [diff] [blame] | 1039 | |
Arjan van de Ven | 67df197 | 2006-01-06 00:12:04 -0800 | [diff] [blame] | 1040 | #endif |
| 1041 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1042 | #ifdef CONFIG_BLK_DEV_INITRD |
| 1043 | void free_initrd_mem(unsigned long start, unsigned long end) |
| 1044 | { |
Linus Torvalds | e3ebadd | 2007-05-07 08:44:24 -0700 | [diff] [blame] | 1045 | free_init_pages("initrd memory", start, end); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1046 | } |
| 1047 | #endif |
| 1048 | |
Yinghai Lu | d2dbf34 | 2008-06-13 02:00:56 -0700 | [diff] [blame] | 1049 | int __init reserve_bootmem_generic(unsigned long phys, unsigned long len, |
| 1050 | int flags) |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1051 | { |
Matt Tolentino | 2b97690 | 2005-06-23 00:08:06 -0700 | [diff] [blame] | 1052 | #ifdef CONFIG_NUMA |
Yinghai Lu | 8b3cd09e | 2008-03-18 12:50:21 -0700 | [diff] [blame] | 1053 | int nid, next_nid; |
Yinghai Lu | 6a07a0e | 2008-06-23 14:02:36 -0700 | [diff] [blame] | 1054 | int ret; |
Andi Kleen | 5e58a02 | 2006-11-14 16:57:46 +0100 | [diff] [blame] | 1055 | #endif |
| 1056 | unsigned long pfn = phys >> PAGE_SHIFT; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1057 | |
Yinghai Lu | c987d12 | 2008-06-24 22:14:09 -0700 | [diff] [blame] | 1058 | if (pfn >= max_pfn) { |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1059 | /* |
| 1060 | * This can happen with kdump kernels when accessing |
| 1061 | * firmware tables: |
| 1062 | */ |
Thomas Gleixner | 6779429 | 2008-03-21 21:27:10 +0100 | [diff] [blame] | 1063 | if (pfn < max_pfn_mapped) |
Bernhard Walle | 8b2ef1d | 2008-06-08 15:46:30 +0200 | [diff] [blame] | 1064 | return -EFAULT; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1065 | |
Yinghai Lu | 6a07a0e | 2008-06-23 14:02:36 -0700 | [diff] [blame] | 1066 | printk(KERN_ERR "reserve_bootmem: illegal reserve %lx %lu\n", |
Andi Kleen | 5e58a02 | 2006-11-14 16:57:46 +0100 | [diff] [blame] | 1067 | phys, len); |
Bernhard Walle | 8b2ef1d | 2008-06-08 15:46:30 +0200 | [diff] [blame] | 1068 | return -EFAULT; |
Andi Kleen | 5e58a02 | 2006-11-14 16:57:46 +0100 | [diff] [blame] | 1069 | } |
| 1070 | |
| 1071 | /* Should check here against the e820 map to avoid double free */ |
| 1072 | #ifdef CONFIG_NUMA |
Yinghai Lu | 8b3cd09e | 2008-03-18 12:50:21 -0700 | [diff] [blame] | 1073 | nid = phys_to_nid(phys); |
| 1074 | next_nid = phys_to_nid(phys + len - 1); |
| 1075 | if (nid == next_nid) |
Bernhard Walle | 8b2ef1d | 2008-06-08 15:46:30 +0200 | [diff] [blame] | 1076 | ret = reserve_bootmem_node(NODE_DATA(nid), phys, len, flags); |
Yinghai Lu | 8b3cd09e | 2008-03-18 12:50:21 -0700 | [diff] [blame] | 1077 | else |
Bernhard Walle | 8b2ef1d | 2008-06-08 15:46:30 +0200 | [diff] [blame] | 1078 | ret = reserve_bootmem(phys, len, flags); |
| 1079 | |
| 1080 | if (ret != 0) |
| 1081 | return ret; |
| 1082 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1083 | #else |
Bernhard Walle | 72a7fe3 | 2008-02-07 00:15:17 -0800 | [diff] [blame] | 1084 | reserve_bootmem(phys, len, BOOTMEM_DEFAULT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1085 | #endif |
Yinghai Lu | 8b3cd09e | 2008-03-18 12:50:21 -0700 | [diff] [blame] | 1086 | |
Mel Gorman | 0e0b864 | 2006-09-27 01:49:56 -0700 | [diff] [blame] | 1087 | if (phys+len <= MAX_DMA_PFN*PAGE_SIZE) { |
Andi Kleen | e18c687 | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 1088 | dma_reserve += len / PAGE_SIZE; |
Mel Gorman | 0e0b864 | 2006-09-27 01:49:56 -0700 | [diff] [blame] | 1089 | set_dma_reserve(dma_reserve); |
| 1090 | } |
Bernhard Walle | 8b2ef1d | 2008-06-08 15:46:30 +0200 | [diff] [blame] | 1091 | |
| 1092 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1093 | } |
| 1094 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1095 | int kern_addr_valid(unsigned long addr) |
| 1096 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1097 | unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1098 | pgd_t *pgd; |
| 1099 | pud_t *pud; |
| 1100 | pmd_t *pmd; |
| 1101 | pte_t *pte; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1102 | |
| 1103 | if (above != 0 && above != -1UL) |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1104 | return 0; |
| 1105 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1106 | pgd = pgd_offset_k(addr); |
| 1107 | if (pgd_none(*pgd)) |
| 1108 | return 0; |
| 1109 | |
| 1110 | pud = pud_offset(pgd, addr); |
| 1111 | if (pud_none(*pud)) |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1112 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1113 | |
| 1114 | pmd = pmd_offset(pud, addr); |
| 1115 | if (pmd_none(*pmd)) |
| 1116 | return 0; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1117 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1118 | if (pmd_large(*pmd)) |
| 1119 | return pfn_valid(pmd_pfn(*pmd)); |
| 1120 | |
| 1121 | pte = pte_offset_kernel(pmd, addr); |
| 1122 | if (pte_none(*pte)) |
| 1123 | return 0; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1124 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1125 | return pfn_valid(pte_pfn(*pte)); |
| 1126 | } |
| 1127 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1128 | /* |
| 1129 | * A pseudo VMA to allow ptrace access for the vsyscall page. This only |
| 1130 | * covers the 64bit vsyscall page now. 32bit has a real VMA now and does |
| 1131 | * not need special handling anymore: |
| 1132 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1133 | static struct vm_area_struct gate_vma = { |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1134 | .vm_start = VSYSCALL_START, |
| 1135 | .vm_end = VSYSCALL_START + (VSYSCALL_MAPPED_PAGES * PAGE_SIZE), |
| 1136 | .vm_page_prot = PAGE_READONLY_EXEC, |
| 1137 | .vm_flags = VM_READ | VM_EXEC |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1138 | }; |
| 1139 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1140 | struct vm_area_struct *get_gate_vma(struct task_struct *tsk) |
| 1141 | { |
| 1142 | #ifdef CONFIG_IA32_EMULATION |
Andi Kleen | 1e01441 | 2005-04-16 15:24:55 -0700 | [diff] [blame] | 1143 | if (test_tsk_thread_flag(tsk, TIF_IA32)) |
| 1144 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1145 | #endif |
| 1146 | return &gate_vma; |
| 1147 | } |
| 1148 | |
| 1149 | int in_gate_area(struct task_struct *task, unsigned long addr) |
| 1150 | { |
| 1151 | struct vm_area_struct *vma = get_gate_vma(task); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1152 | |
Andi Kleen | 1e01441 | 2005-04-16 15:24:55 -0700 | [diff] [blame] | 1153 | if (!vma) |
| 1154 | return 0; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1155 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1156 | return (addr >= vma->vm_start) && (addr < vma->vm_end); |
| 1157 | } |
| 1158 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1159 | /* |
| 1160 | * Use this when you have no reliable task/vma, typically from interrupt |
| 1161 | * context. It is less reliable than using the task's vma and may give |
| 1162 | * false positives: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1163 | */ |
| 1164 | int in_gate_area_no_task(unsigned long addr) |
| 1165 | { |
Andi Kleen | 1e01441 | 2005-04-16 15:24:55 -0700 | [diff] [blame] | 1166 | return (addr >= VSYSCALL_START) && (addr < VSYSCALL_END); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1167 | } |
Zou Nan hai | 2e1c49d | 2007-06-01 00:46:28 -0700 | [diff] [blame] | 1168 | |
Andi Kleen | 2aae950 | 2007-07-21 17:10:01 +0200 | [diff] [blame] | 1169 | const char *arch_vma_name(struct vm_area_struct *vma) |
| 1170 | { |
| 1171 | if (vma->vm_mm && vma->vm_start == (long)vma->vm_mm->context.vdso) |
| 1172 | return "[vdso]"; |
| 1173 | if (vma == &gate_vma) |
| 1174 | return "[vsyscall]"; |
| 1175 | return NULL; |
| 1176 | } |
Christoph Lameter | 0889eba | 2007-10-16 01:24:15 -0700 | [diff] [blame] | 1177 | |
| 1178 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
| 1179 | /* |
| 1180 | * Initialise the sparsemem vmemmap using huge-pages at the PMD level. |
| 1181 | */ |
Yinghai Lu | c2b91e2 | 2008-04-12 01:19:24 -0700 | [diff] [blame] | 1182 | static long __meminitdata addr_start, addr_end; |
| 1183 | static void __meminitdata *p_start, *p_end; |
| 1184 | static int __meminitdata node_start; |
| 1185 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1186 | int __meminit |
| 1187 | vmemmap_populate(struct page *start_page, unsigned long size, int node) |
Christoph Lameter | 0889eba | 2007-10-16 01:24:15 -0700 | [diff] [blame] | 1188 | { |
| 1189 | unsigned long addr = (unsigned long)start_page; |
| 1190 | unsigned long end = (unsigned long)(start_page + size); |
| 1191 | unsigned long next; |
| 1192 | pgd_t *pgd; |
| 1193 | pud_t *pud; |
| 1194 | pmd_t *pmd; |
| 1195 | |
| 1196 | for (; addr < end; addr = next) { |
Jeremy Fitzhardinge | 7c934d3 | 2008-06-25 00:19:20 -0400 | [diff] [blame] | 1197 | void *p = NULL; |
Christoph Lameter | 0889eba | 2007-10-16 01:24:15 -0700 | [diff] [blame] | 1198 | |
| 1199 | pgd = vmemmap_pgd_populate(addr, node); |
| 1200 | if (!pgd) |
| 1201 | return -ENOMEM; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1202 | |
Christoph Lameter | 0889eba | 2007-10-16 01:24:15 -0700 | [diff] [blame] | 1203 | pud = vmemmap_pud_populate(pgd, addr, node); |
| 1204 | if (!pud) |
| 1205 | return -ENOMEM; |
| 1206 | |
Jeremy Fitzhardinge | 7c934d3 | 2008-06-25 00:19:20 -0400 | [diff] [blame] | 1207 | if (!cpu_has_pse) { |
| 1208 | next = (addr + PAGE_SIZE) & PAGE_MASK; |
| 1209 | pmd = vmemmap_pmd_populate(pud, addr, node); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1210 | |
Jeremy Fitzhardinge | 7c934d3 | 2008-06-25 00:19:20 -0400 | [diff] [blame] | 1211 | if (!pmd) |
| 1212 | return -ENOMEM; |
| 1213 | |
| 1214 | p = vmemmap_pte_populate(pmd, addr, node); |
| 1215 | |
Christoph Lameter | 0889eba | 2007-10-16 01:24:15 -0700 | [diff] [blame] | 1216 | if (!p) |
| 1217 | return -ENOMEM; |
| 1218 | |
Jeremy Fitzhardinge | 7c934d3 | 2008-06-25 00:19:20 -0400 | [diff] [blame] | 1219 | addr_end = addr + PAGE_SIZE; |
| 1220 | p_end = p + PAGE_SIZE; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1221 | } else { |
Jeremy Fitzhardinge | 7c934d3 | 2008-06-25 00:19:20 -0400 | [diff] [blame] | 1222 | next = pmd_addr_end(addr, end); |
| 1223 | |
| 1224 | pmd = pmd_offset(pud, addr); |
| 1225 | if (pmd_none(*pmd)) { |
| 1226 | pte_t entry; |
| 1227 | |
| 1228 | p = vmemmap_alloc_block(PMD_SIZE, node); |
| 1229 | if (!p) |
| 1230 | return -ENOMEM; |
| 1231 | |
| 1232 | entry = pfn_pte(__pa(p) >> PAGE_SHIFT, |
| 1233 | PAGE_KERNEL_LARGE); |
| 1234 | set_pmd(pmd, __pmd(pte_val(entry))); |
| 1235 | |
Jeremy Fitzhardinge | 7c934d3 | 2008-06-25 00:19:20 -0400 | [diff] [blame] | 1236 | /* check to see if we have contiguous blocks */ |
| 1237 | if (p_end != p || node_start != node) { |
| 1238 | if (p_start) |
| 1239 | printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n", |
| 1240 | addr_start, addr_end-1, p_start, p_end-1, node_start); |
| 1241 | addr_start = addr; |
| 1242 | node_start = node; |
| 1243 | p_start = p; |
| 1244 | } |
Yinghai Lu | 49c980d | 2008-07-03 12:29:34 -0700 | [diff] [blame] | 1245 | |
| 1246 | addr_end = addr + PMD_SIZE; |
| 1247 | p_end = p + PMD_SIZE; |
Jeremy Fitzhardinge | 7c934d3 | 2008-06-25 00:19:20 -0400 | [diff] [blame] | 1248 | } else |
| 1249 | vmemmap_verify((pte_t *)pmd, node, addr, next); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1250 | } |
Jeremy Fitzhardinge | 7c934d3 | 2008-06-25 00:19:20 -0400 | [diff] [blame] | 1251 | |
Christoph Lameter | 0889eba | 2007-10-16 01:24:15 -0700 | [diff] [blame] | 1252 | } |
Christoph Lameter | 0889eba | 2007-10-16 01:24:15 -0700 | [diff] [blame] | 1253 | return 0; |
| 1254 | } |
Yinghai Lu | c2b91e2 | 2008-04-12 01:19:24 -0700 | [diff] [blame] | 1255 | |
| 1256 | void __meminit vmemmap_populate_print_last(void) |
| 1257 | { |
| 1258 | if (p_start) { |
| 1259 | printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n", |
| 1260 | addr_start, addr_end-1, p_start, p_end-1, node_start); |
| 1261 | p_start = NULL; |
| 1262 | p_end = NULL; |
| 1263 | node_start = 0; |
| 1264 | } |
| 1265 | } |
Christoph Lameter | 0889eba | 2007-10-16 01:24:15 -0700 | [diff] [blame] | 1266 | #endif |