Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/x86_64/mm/init.c |
| 3 | * |
| 4 | * Copyright (C) 1995 Linus Torvalds |
| 5 | * Copyright (C) 2000 Pavel Machek <pavel@suse.cz> |
| 6 | * Copyright (C) 2002,2003 Andi Kleen <ak@suse.de> |
| 7 | */ |
| 8 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | #include <linux/signal.h> |
| 10 | #include <linux/sched.h> |
| 11 | #include <linux/kernel.h> |
| 12 | #include <linux/errno.h> |
| 13 | #include <linux/string.h> |
| 14 | #include <linux/types.h> |
| 15 | #include <linux/ptrace.h> |
| 16 | #include <linux/mman.h> |
| 17 | #include <linux/mm.h> |
| 18 | #include <linux/swap.h> |
| 19 | #include <linux/smp.h> |
| 20 | #include <linux/init.h> |
| 21 | #include <linux/pagemap.h> |
| 22 | #include <linux/bootmem.h> |
| 23 | #include <linux/proc_fs.h> |
Andi Kleen | 5917089 | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 24 | #include <linux/pci.h> |
Jan Beulich | 6fb1475 | 2007-05-02 19:27:10 +0200 | [diff] [blame] | 25 | #include <linux/pfn.h> |
Randy Dunlap | c9cf552 | 2006-06-27 02:53:52 -0700 | [diff] [blame] | 26 | #include <linux/poison.h> |
Muli Ben-Yehuda | 17a941d | 2006-01-11 22:44:42 +0100 | [diff] [blame] | 27 | #include <linux/dma-mapping.h> |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 28 | #include <linux/module.h> |
| 29 | #include <linux/memory_hotplug.h> |
Konrad Rzeszutek | ae32b12 | 2007-05-02 19:27:11 +0200 | [diff] [blame] | 30 | #include <linux/nmi.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | |
| 32 | #include <asm/processor.h> |
| 33 | #include <asm/system.h> |
| 34 | #include <asm/uaccess.h> |
| 35 | #include <asm/pgtable.h> |
| 36 | #include <asm/pgalloc.h> |
| 37 | #include <asm/dma.h> |
| 38 | #include <asm/fixmap.h> |
| 39 | #include <asm/e820.h> |
| 40 | #include <asm/apic.h> |
| 41 | #include <asm/tlb.h> |
| 42 | #include <asm/mmu_context.h> |
| 43 | #include <asm/proto.h> |
| 44 | #include <asm/smp.h> |
Andi Kleen | 2bc0414 | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 45 | #include <asm/sections.h> |
Thomas Gleixner | 718fc13 | 2008-01-30 13:30:17 +0100 | [diff] [blame] | 46 | #include <asm/kdebug.h> |
Thomas Gleixner | aaa64e0 | 2008-01-30 13:30:17 +0100 | [diff] [blame] | 47 | #include <asm/numa.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | |
| 49 | #ifndef Dprintk |
| 50 | #define Dprintk(x...) |
| 51 | #endif |
| 52 | |
Stephen Hemminger | e658450 | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 53 | const struct dma_mapping_ops* dma_ops; |
Muli Ben-Yehuda | 17a941d | 2006-01-11 22:44:42 +0100 | [diff] [blame] | 54 | EXPORT_SYMBOL(dma_ops); |
| 55 | |
Andi Kleen | e18c687 | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 56 | static unsigned long dma_reserve __initdata; |
| 57 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); |
| 59 | |
| 60 | /* |
| 61 | * NOTE: pagetable_init alloc all the fixmap pagetables contiguous on the |
| 62 | * physical space so we can cache the place of the first one and move |
| 63 | * around without checking the pgd every time. |
| 64 | */ |
| 65 | |
| 66 | void show_mem(void) |
| 67 | { |
Andi Kleen | e92343c | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 68 | long i, total = 0, reserved = 0; |
| 69 | long shared = 0, cached = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | pg_data_t *pgdat; |
| 71 | struct page *page; |
| 72 | |
Andi Kleen | e92343c | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 73 | printk(KERN_INFO "Mem-info:\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | show_free_areas(); |
Andi Kleen | e92343c | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 75 | printk(KERN_INFO "Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | |
KAMEZAWA Hiroyuki | ec936fc | 2006-03-27 01:15:59 -0800 | [diff] [blame] | 77 | for_each_online_pgdat(pgdat) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | for (i = 0; i < pgdat->node_spanned_pages; ++i) { |
Konrad Rzeszutek | ae32b12 | 2007-05-02 19:27:11 +0200 | [diff] [blame] | 79 | /* this loop can take a while with 256 GB and 4k pages |
| 80 | so update the NMI watchdog */ |
| 81 | if (unlikely(i % MAX_ORDER_NR_PAGES == 0)) { |
| 82 | touch_nmi_watchdog(); |
| 83 | } |
Bob Picco | 12710a5 | 2007-06-08 13:47:00 -0700 | [diff] [blame] | 84 | if (!pfn_valid(pgdat->node_start_pfn + i)) |
| 85 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | page = pfn_to_page(pgdat->node_start_pfn + i); |
| 87 | total++; |
Andi Kleen | e92343c | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 88 | if (PageReserved(page)) |
| 89 | reserved++; |
| 90 | else if (PageSwapCache(page)) |
| 91 | cached++; |
| 92 | else if (page_count(page)) |
| 93 | shared += page_count(page) - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | } |
| 95 | } |
Andi Kleen | e92343c | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 96 | printk(KERN_INFO "%lu pages of RAM\n", total); |
| 97 | printk(KERN_INFO "%lu reserved pages\n",reserved); |
| 98 | printk(KERN_INFO "%lu pages shared\n",shared); |
| 99 | printk(KERN_INFO "%lu pages swap cached\n",cached); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | } |
| 101 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | int after_bootmem; |
| 103 | |
Andi Kleen | 5f44a66 | 2006-03-25 16:30:25 +0100 | [diff] [blame] | 104 | static __init void *spp_getpage(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | { |
| 106 | void *ptr; |
| 107 | if (after_bootmem) |
| 108 | ptr = (void *) get_zeroed_page(GFP_ATOMIC); |
| 109 | else |
| 110 | ptr = alloc_bootmem_pages(PAGE_SIZE); |
| 111 | if (!ptr || ((unsigned long)ptr & ~PAGE_MASK)) |
| 112 | panic("set_pte_phys: cannot allocate page data %s\n", after_bootmem?"after bootmem":""); |
| 113 | |
| 114 | Dprintk("spp_getpage %p\n", ptr); |
| 115 | return ptr; |
| 116 | } |
| 117 | |
Andi Kleen | 5f44a66 | 2006-03-25 16:30:25 +0100 | [diff] [blame] | 118 | static __init void set_pte_phys(unsigned long vaddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | unsigned long phys, pgprot_t prot) |
| 120 | { |
| 121 | pgd_t *pgd; |
| 122 | pud_t *pud; |
| 123 | pmd_t *pmd; |
| 124 | pte_t *pte, new_pte; |
| 125 | |
| 126 | Dprintk("set_pte_phys %lx to %lx\n", vaddr, phys); |
| 127 | |
| 128 | pgd = pgd_offset_k(vaddr); |
| 129 | if (pgd_none(*pgd)) { |
| 130 | printk("PGD FIXMAP MISSING, it should be setup in head.S!\n"); |
| 131 | return; |
| 132 | } |
| 133 | pud = pud_offset(pgd, vaddr); |
| 134 | if (pud_none(*pud)) { |
| 135 | pmd = (pmd_t *) spp_getpage(); |
| 136 | set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE | _PAGE_USER)); |
| 137 | if (pmd != pmd_offset(pud, 0)) { |
| 138 | printk("PAGETABLE BUG #01! %p <-> %p\n", pmd, pmd_offset(pud,0)); |
| 139 | return; |
| 140 | } |
| 141 | } |
| 142 | pmd = pmd_offset(pud, vaddr); |
| 143 | if (pmd_none(*pmd)) { |
| 144 | pte = (pte_t *) spp_getpage(); |
| 145 | set_pmd(pmd, __pmd(__pa(pte) | _KERNPG_TABLE | _PAGE_USER)); |
| 146 | if (pte != pte_offset_kernel(pmd, 0)) { |
| 147 | printk("PAGETABLE BUG #02!\n"); |
| 148 | return; |
| 149 | } |
| 150 | } |
| 151 | new_pte = pfn_pte(phys >> PAGE_SHIFT, prot); |
| 152 | |
| 153 | pte = pte_offset_kernel(pmd, vaddr); |
| 154 | if (!pte_none(*pte) && |
| 155 | pte_val(*pte) != (pte_val(new_pte) & __supported_pte_mask)) |
| 156 | pte_ERROR(*pte); |
| 157 | set_pte(pte, new_pte); |
| 158 | |
| 159 | /* |
| 160 | * It's enough to flush this one mapping. |
| 161 | * (PGE mappings get flushed as well) |
| 162 | */ |
| 163 | __flush_tlb_one(vaddr); |
| 164 | } |
| 165 | |
| 166 | /* NOTE: this is meant to be run only at boot */ |
Andi Kleen | 5f44a66 | 2006-03-25 16:30:25 +0100 | [diff] [blame] | 167 | void __init |
| 168 | __set_fixmap (enum fixed_addresses idx, unsigned long phys, pgprot_t prot) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | { |
| 170 | unsigned long address = __fix_to_virt(idx); |
| 171 | |
| 172 | if (idx >= __end_of_fixed_addresses) { |
| 173 | printk("Invalid __set_fixmap\n"); |
| 174 | return; |
| 175 | } |
| 176 | set_pte_phys(address, phys, prot); |
| 177 | } |
| 178 | |
Andi Kleen | 7517527 | 2008-01-30 13:33:17 +0100 | [diff] [blame] | 179 | static unsigned long __initdata table_start; |
| 180 | static unsigned long __meminitdata table_end; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 182 | static __meminit void *alloc_low_page(unsigned long *phys) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | { |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 184 | unsigned long pfn = table_end++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | void *adr; |
| 186 | |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 187 | if (after_bootmem) { |
| 188 | adr = (void *)get_zeroed_page(GFP_ATOMIC); |
| 189 | *phys = __pa(adr); |
| 190 | return adr; |
| 191 | } |
| 192 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | if (pfn >= end_pfn) |
| 194 | panic("alloc_low_page: ran out of memory"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 196 | adr = early_ioremap(pfn * PAGE_SIZE, PAGE_SIZE); |
| 197 | memset(adr, 0, PAGE_SIZE); |
| 198 | *phys = pfn * PAGE_SIZE; |
| 199 | return adr; |
| 200 | } |
| 201 | |
| 202 | static __meminit void unmap_low_page(void *adr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | { |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 204 | |
| 205 | if (after_bootmem) |
| 206 | return; |
| 207 | |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 208 | early_iounmap(adr, PAGE_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | } |
| 210 | |
Andi Kleen | f2d3efe | 2006-03-25 16:30:22 +0100 | [diff] [blame] | 211 | /* Must run before zap_low_mappings */ |
Yasunori Goto | a3142c8 | 2007-05-08 00:23:07 -0700 | [diff] [blame] | 212 | __meminit void *early_ioremap(unsigned long addr, unsigned long size) |
Andi Kleen | f2d3efe | 2006-03-25 16:30:22 +0100 | [diff] [blame] | 213 | { |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 214 | unsigned long vaddr; |
| 215 | pmd_t *pmd, *last_pmd; |
| 216 | int i, pmds; |
Andi Kleen | f2d3efe | 2006-03-25 16:30:22 +0100 | [diff] [blame] | 217 | |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 218 | pmds = ((addr & ~PMD_MASK) + size + ~PMD_MASK) / PMD_SIZE; |
| 219 | vaddr = __START_KERNEL_map; |
| 220 | pmd = level2_kernel_pgt; |
| 221 | last_pmd = level2_kernel_pgt + PTRS_PER_PMD - 1; |
| 222 | for (; pmd <= last_pmd; pmd++, vaddr += PMD_SIZE) { |
| 223 | for (i = 0; i < pmds; i++) { |
| 224 | if (pmd_present(pmd[i])) |
| 225 | goto next; |
| 226 | } |
| 227 | vaddr += addr & ~PMD_MASK; |
| 228 | addr &= PMD_MASK; |
| 229 | for (i = 0; i < pmds; i++, addr += PMD_SIZE) |
Joerg Roedel | 929fd58 | 2008-01-30 13:31:08 +0100 | [diff] [blame] | 230 | set_pmd(pmd+i, __pmd(addr | __PAGE_KERNEL_LARGE_EXEC)); |
Andi Kleen | 1a2b441 | 2008-01-30 13:33:54 +0100 | [diff] [blame] | 231 | __flush_tlb_all(); |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 232 | return (void *)vaddr; |
| 233 | next: |
| 234 | ; |
Andi Kleen | f2d3efe | 2006-03-25 16:30:22 +0100 | [diff] [blame] | 235 | } |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 236 | printk("early_ioremap(0x%lx, %lu) failed\n", addr, size); |
| 237 | return NULL; |
Andi Kleen | f2d3efe | 2006-03-25 16:30:22 +0100 | [diff] [blame] | 238 | } |
| 239 | |
| 240 | /* To avoid virtual aliases later */ |
Yasunori Goto | a3142c8 | 2007-05-08 00:23:07 -0700 | [diff] [blame] | 241 | __meminit void early_iounmap(void *addr, unsigned long size) |
Andi Kleen | f2d3efe | 2006-03-25 16:30:22 +0100 | [diff] [blame] | 242 | { |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 243 | unsigned long vaddr; |
| 244 | pmd_t *pmd; |
| 245 | int i, pmds; |
| 246 | |
| 247 | vaddr = (unsigned long)addr; |
| 248 | pmds = ((vaddr & ~PMD_MASK) + size + ~PMD_MASK) / PMD_SIZE; |
| 249 | pmd = level2_kernel_pgt + pmd_index(vaddr); |
| 250 | for (i = 0; i < pmds; i++) |
| 251 | pmd_clear(pmd + i); |
Andi Kleen | 1a2b441 | 2008-01-30 13:33:54 +0100 | [diff] [blame] | 252 | __flush_tlb_all(); |
Andi Kleen | f2d3efe | 2006-03-25 16:30:22 +0100 | [diff] [blame] | 253 | } |
| 254 | |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 255 | static void __meminit |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 256 | phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end) |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 257 | { |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 258 | int i = pmd_index(address); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 260 | for (; i < PTRS_PER_PMD; i++, address += PMD_SIZE) { |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 261 | unsigned long entry; |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 262 | pmd_t *pmd = pmd_page + pmd_index(address); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 263 | |
Jan Beulich | 5f51e13 | 2006-06-26 13:59:02 +0200 | [diff] [blame] | 264 | if (address >= end) { |
| 265 | if (!after_bootmem) |
| 266 | for (; i < PTRS_PER_PMD; i++, pmd++) |
| 267 | set_pmd(pmd, __pmd(0)); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 268 | break; |
| 269 | } |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 270 | |
| 271 | if (pmd_val(*pmd)) |
| 272 | continue; |
| 273 | |
Joerg Roedel | 40842bf | 2008-01-30 13:31:02 +0100 | [diff] [blame] | 274 | entry = __PAGE_KERNEL_LARGE|_PAGE_GLOBAL|address; |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 275 | entry &= __supported_pte_mask; |
| 276 | set_pmd(pmd, __pmd(entry)); |
| 277 | } |
| 278 | } |
| 279 | |
| 280 | static void __meminit |
| 281 | phys_pmd_update(pud_t *pud, unsigned long address, unsigned long end) |
| 282 | { |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 283 | pmd_t *pmd = pmd_offset(pud,0); |
| 284 | spin_lock(&init_mm.page_table_lock); |
| 285 | phys_pmd_init(pmd, address, end); |
| 286 | spin_unlock(&init_mm.page_table_lock); |
| 287 | __flush_tlb_all(); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 288 | } |
| 289 | |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 290 | static void __meminit phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end) |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 291 | { |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 292 | int i = pud_index(addr); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 293 | |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 294 | |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 295 | for (; i < PTRS_PER_PUD; i++, addr = (addr & PUD_MASK) + PUD_SIZE ) { |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 296 | unsigned long pmd_phys; |
| 297 | pud_t *pud = pud_page + pud_index(addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | pmd_t *pmd; |
| 299 | |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 300 | if (addr >= end) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 303 | if (!after_bootmem && !e820_any_mapped(addr,addr+PUD_SIZE,0)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | set_pud(pud, __pud(0)); |
| 305 | continue; |
| 306 | } |
| 307 | |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 308 | if (pud_val(*pud)) { |
| 309 | phys_pmd_update(pud, addr, end); |
| 310 | continue; |
| 311 | } |
| 312 | |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 313 | pmd = alloc_low_page(&pmd_phys); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 314 | spin_lock(&init_mm.page_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | set_pud(pud, __pud(pmd_phys | _KERNPG_TABLE)); |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 316 | phys_pmd_init(pmd, addr, end); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 317 | spin_unlock(&init_mm.page_table_lock); |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 318 | unmap_low_page(pmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | } |
Andi Kleen | 1a2b441 | 2008-01-30 13:33:54 +0100 | [diff] [blame] | 320 | __flush_tlb_all(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | } |
| 322 | |
| 323 | static void __init find_early_table_space(unsigned long end) |
| 324 | { |
Andi Kleen | 6c5acd1 | 2006-01-11 22:46:57 +0100 | [diff] [blame] | 325 | unsigned long puds, pmds, tables, start; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | |
| 327 | puds = (end + PUD_SIZE - 1) >> PUD_SHIFT; |
| 328 | pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT; |
| 329 | tables = round_up(puds * sizeof(pud_t), PAGE_SIZE) + |
| 330 | round_up(pmds * sizeof(pmd_t), PAGE_SIZE); |
| 331 | |
Andi Kleen | ee408c7 | 2006-01-16 01:56:51 +0100 | [diff] [blame] | 332 | /* RED-PEN putting page tables only on node 0 could |
| 333 | cause a hotspot and fill up ZONE_DMA. The page tables |
| 334 | need roughly 0.5KB per GB. */ |
| 335 | start = 0x8000; |
| 336 | table_start = find_e820_area(start, end, tables); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | if (table_start == -1UL) |
| 338 | panic("Cannot find space for the kernel page tables"); |
| 339 | |
| 340 | table_start >>= PAGE_SHIFT; |
| 341 | table_end = table_start; |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 342 | |
| 343 | early_printk("kernel direct mapping tables up to %lx @ %lx-%lx\n", |
Jan Beulich | 5f51e13 | 2006-06-26 13:59:02 +0200 | [diff] [blame] | 344 | end, table_start << PAGE_SHIFT, |
| 345 | (table_start << PAGE_SHIFT) + tables); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | } |
| 347 | |
| 348 | /* Setup the direct mapping of the physical memory at PAGE_OFFSET. |
| 349 | This runs before bootmem is initialized and gets pages directly from the |
| 350 | physical memory. To access them they are temporarily mapped. */ |
KAMEZAWA Hiroyuki | b6fd6ec | 2007-11-28 16:21:58 -0800 | [diff] [blame] | 351 | void __init_refok init_memory_mapping(unsigned long start, unsigned long end) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | { |
| 353 | unsigned long next; |
| 354 | |
| 355 | Dprintk("init_memory_mapping\n"); |
| 356 | |
| 357 | /* |
| 358 | * Find space for the kernel direct mapping tables. |
| 359 | * Later we should allocate these tables in the local node of the memory |
| 360 | * mapped. Unfortunately this is done currently before the nodes are |
| 361 | * discovered. |
| 362 | */ |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 363 | if (!after_bootmem) |
| 364 | find_early_table_space(end); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | |
| 366 | start = (unsigned long)__va(start); |
| 367 | end = (unsigned long)__va(end); |
| 368 | |
| 369 | for (; start < end; start = next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | unsigned long pud_phys; |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 371 | pgd_t *pgd = pgd_offset_k(start); |
| 372 | pud_t *pud; |
| 373 | |
| 374 | if (after_bootmem) |
Andi Kleen | d2ae5b5 | 2006-06-26 13:57:56 +0200 | [diff] [blame] | 375 | pud = pud_offset(pgd, start & PGDIR_MASK); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 376 | else |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 377 | pud = alloc_low_page(&pud_phys); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 378 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | next = start + PGDIR_SIZE; |
| 380 | if (next > end) |
| 381 | next = end; |
| 382 | phys_pud_init(pud, __pa(start), __pa(next)); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 383 | if (!after_bootmem) |
| 384 | set_pgd(pgd_offset_k(start), mk_kernel_pgd(pud_phys)); |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 385 | unmap_low_page(pud); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | } |
| 387 | |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 388 | if (!after_bootmem) |
Glauber de Oliveira Costa | f51c945 | 2007-07-22 11:12:29 +0200 | [diff] [blame] | 389 | mmu_cr4_features = read_cr4(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | __flush_tlb_all(); |
Andi Kleen | 7517527 | 2008-01-30 13:33:17 +0100 | [diff] [blame] | 391 | |
| 392 | reserve_early(table_start << PAGE_SHIFT, table_end << PAGE_SHIFT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | } |
| 394 | |
Matt Tolentino | 2b97690 | 2005-06-23 00:08:06 -0700 | [diff] [blame] | 395 | #ifndef CONFIG_NUMA |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | void __init paging_init(void) |
| 397 | { |
Mel Gorman | 6391af1 | 2006-10-11 01:20:39 -0700 | [diff] [blame] | 398 | unsigned long max_zone_pfns[MAX_NR_ZONES]; |
| 399 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); |
| 400 | max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN; |
| 401 | max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN; |
| 402 | max_zone_pfns[ZONE_NORMAL] = end_pfn; |
| 403 | |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 404 | memory_present(0, 0, end_pfn); |
| 405 | sparse_init(); |
Mel Gorman | 5cb248a | 2006-09-27 01:49:52 -0700 | [diff] [blame] | 406 | free_area_init_nodes(max_zone_pfns); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | } |
| 408 | #endif |
| 409 | |
| 410 | /* Unmap a kernel mapping if it exists. This is useful to avoid prefetches |
| 411 | from the CPU leading to inconsistent cache lines. address and size |
| 412 | must be aligned to 2MB boundaries. |
| 413 | Does nothing when the mapping doesn't exist. */ |
| 414 | void __init clear_kernel_mapping(unsigned long address, unsigned long size) |
| 415 | { |
| 416 | unsigned long end = address + size; |
| 417 | |
| 418 | BUG_ON(address & ~LARGE_PAGE_MASK); |
| 419 | BUG_ON(size & ~LARGE_PAGE_MASK); |
| 420 | |
| 421 | for (; address < end; address += LARGE_PAGE_SIZE) { |
| 422 | pgd_t *pgd = pgd_offset_k(address); |
| 423 | pud_t *pud; |
| 424 | pmd_t *pmd; |
| 425 | if (pgd_none(*pgd)) |
| 426 | continue; |
| 427 | pud = pud_offset(pgd, address); |
| 428 | if (pud_none(*pud)) |
| 429 | continue; |
| 430 | pmd = pmd_offset(pud, address); |
| 431 | if (!pmd || pmd_none(*pmd)) |
| 432 | continue; |
| 433 | if (0 == (pmd_val(*pmd) & _PAGE_PSE)) { |
| 434 | /* Could handle this, but it should not happen currently. */ |
| 435 | printk(KERN_ERR |
| 436 | "clear_kernel_mapping: mapping has been split. will leak memory\n"); |
| 437 | pmd_ERROR(*pmd); |
| 438 | } |
| 439 | set_pmd(pmd, __pmd(0)); |
| 440 | } |
| 441 | __flush_tlb_all(); |
| 442 | } |
| 443 | |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 444 | /* |
| 445 | * Memory hotplug specific functions |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 446 | */ |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 447 | void online_page(struct page *page) |
| 448 | { |
| 449 | ClearPageReserved(page); |
Nick Piggin | 7835e98 | 2006-03-22 00:08:40 -0800 | [diff] [blame] | 450 | init_page_count(page); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 451 | __free_page(page); |
| 452 | totalram_pages++; |
| 453 | num_physpages++; |
| 454 | } |
| 455 | |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 456 | #ifdef CONFIG_MEMORY_HOTPLUG |
| 457 | /* |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 458 | * Memory is added always to NORMAL zone. This means you will never get |
| 459 | * additional DMA/DMA32 memory. |
| 460 | */ |
| 461 | int arch_add_memory(int nid, u64 start, u64 size) |
| 462 | { |
| 463 | struct pglist_data *pgdat = NODE_DATA(nid); |
Christoph Lameter | 776ed98 | 2006-09-25 23:31:09 -0700 | [diff] [blame] | 464 | struct zone *zone = pgdat->node_zones + ZONE_NORMAL; |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 465 | unsigned long start_pfn = start >> PAGE_SHIFT; |
| 466 | unsigned long nr_pages = size >> PAGE_SHIFT; |
| 467 | int ret; |
| 468 | |
Keith Mannthey | 45e0b78 | 2006-09-30 23:27:09 -0700 | [diff] [blame] | 469 | init_memory_mapping(start, (start + size -1)); |
| 470 | |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 471 | ret = __add_pages(zone, start_pfn, nr_pages); |
| 472 | if (ret) |
| 473 | goto error; |
| 474 | |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 475 | return ret; |
| 476 | error: |
| 477 | printk("%s: Problem encountered in __add_pages!\n", __func__); |
| 478 | return ret; |
| 479 | } |
| 480 | EXPORT_SYMBOL_GPL(arch_add_memory); |
| 481 | |
Yasunori Goto | 8243229 | 2006-11-18 22:19:40 -0800 | [diff] [blame] | 482 | #if !defined(CONFIG_ACPI_NUMA) && defined(CONFIG_NUMA) |
Keith Mannthey | 4942e99 | 2006-09-30 23:27:06 -0700 | [diff] [blame] | 483 | int memory_add_physaddr_to_nid(u64 start) |
| 484 | { |
| 485 | return 0; |
| 486 | } |
Keith Mannthey | 8c2676a | 2006-09-30 23:27:07 -0700 | [diff] [blame] | 487 | EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid); |
Keith Mannthey | 4942e99 | 2006-09-30 23:27:06 -0700 | [diff] [blame] | 488 | #endif |
| 489 | |
Keith Mannthey | 45e0b78 | 2006-09-30 23:27:09 -0700 | [diff] [blame] | 490 | #endif /* CONFIG_MEMORY_HOTPLUG */ |
| 491 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | static struct kcore_list kcore_mem, kcore_vmalloc, kcore_kernel, kcore_modules, |
| 493 | kcore_vsyscall; |
| 494 | |
| 495 | void __init mem_init(void) |
| 496 | { |
Andi Kleen | 0a43e4b | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 497 | long codesize, reservedpages, datasize, initsize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | |
Jon Mason | 0dc243a | 2006-06-26 13:58:11 +0200 | [diff] [blame] | 499 | pci_iommu_alloc(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | |
Yinghai Lu | 48ddb15 | 2008-01-30 13:32:36 +0100 | [diff] [blame] | 501 | /* clear_bss() already clear the empty_zero_page */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | |
Ingo Molnar | f263310 | 2008-01-30 13:32:36 +0100 | [diff] [blame] | 503 | /* temporary debugging - double check it's true: */ |
| 504 | { |
| 505 | int i; |
| 506 | |
| 507 | for (i = 0; i < 1024; i++) |
| 508 | WARN_ON_ONCE(empty_zero_page[i]); |
| 509 | } |
| 510 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | reservedpages = 0; |
| 512 | |
| 513 | /* this will put all low memory onto the freelists */ |
Matt Tolentino | 2b97690 | 2005-06-23 00:08:06 -0700 | [diff] [blame] | 514 | #ifdef CONFIG_NUMA |
Andi Kleen | 0a43e4b | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 515 | totalram_pages = numa_free_all_bootmem(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | #else |
Andi Kleen | 0a43e4b | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 517 | totalram_pages = free_all_bootmem(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | #endif |
Mel Gorman | 5cb248a | 2006-09-27 01:49:52 -0700 | [diff] [blame] | 519 | reservedpages = end_pfn - totalram_pages - |
| 520 | absent_pages_in_range(0, end_pfn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | |
| 522 | after_bootmem = 1; |
| 523 | |
| 524 | codesize = (unsigned long) &_etext - (unsigned long) &_text; |
| 525 | datasize = (unsigned long) &_edata - (unsigned long) &_etext; |
| 526 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; |
| 527 | |
| 528 | /* Register memory areas for /proc/kcore */ |
| 529 | kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT); |
| 530 | kclist_add(&kcore_vmalloc, (void *)VMALLOC_START, |
| 531 | VMALLOC_END-VMALLOC_START); |
| 532 | kclist_add(&kcore_kernel, &_stext, _end - _stext); |
| 533 | kclist_add(&kcore_modules, (void *)MODULES_VADDR, MODULES_LEN); |
| 534 | kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START, |
| 535 | VSYSCALL_END - VSYSCALL_START); |
| 536 | |
Andi Kleen | 0a43e4b | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 537 | printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), |
| 539 | end_pfn << (PAGE_SHIFT-10), |
| 540 | codesize >> 10, |
| 541 | reservedpages << (PAGE_SHIFT-10), |
| 542 | datasize >> 10, |
| 543 | initsize >> 10); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | } |
| 545 | |
Gerd Hoffmann | d167a51 | 2006-06-26 13:56:16 +0200 | [diff] [blame] | 546 | void free_init_pages(char *what, unsigned long begin, unsigned long end) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | { |
| 548 | unsigned long addr; |
| 549 | |
Gerd Hoffmann | d167a51 | 2006-06-26 13:56:16 +0200 | [diff] [blame] | 550 | if (begin >= end) |
| 551 | return; |
| 552 | |
Jan Beulich | 6fb1475 | 2007-05-02 19:27:10 +0200 | [diff] [blame] | 553 | printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10); |
Gerd Hoffmann | d167a51 | 2006-06-26 13:56:16 +0200 | [diff] [blame] | 554 | for (addr = begin; addr < end; addr += PAGE_SIZE) { |
Linus Torvalds | e3ebadd | 2007-05-07 08:44:24 -0700 | [diff] [blame] | 555 | ClearPageReserved(virt_to_page(addr)); |
| 556 | init_page_count(virt_to_page(addr)); |
| 557 | memset((void *)(addr & ~(PAGE_SIZE-1)), |
| 558 | POISON_FREE_INITMEM, PAGE_SIZE); |
Jan Beulich | 6fb1475 | 2007-05-02 19:27:10 +0200 | [diff] [blame] | 559 | if (addr >= __START_KERNEL_map) |
| 560 | change_page_attr_addr(addr, 1, __pgprot(0)); |
Linus Torvalds | e3ebadd | 2007-05-07 08:44:24 -0700 | [diff] [blame] | 561 | free_page(addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | totalram_pages++; |
| 563 | } |
Jan Beulich | 6fb1475 | 2007-05-02 19:27:10 +0200 | [diff] [blame] | 564 | if (addr > __START_KERNEL_map) |
| 565 | global_flush_tlb(); |
Gerd Hoffmann | d167a51 | 2006-06-26 13:56:16 +0200 | [diff] [blame] | 566 | } |
| 567 | |
| 568 | void free_initmem(void) |
| 569 | { |
Gerd Hoffmann | d167a51 | 2006-06-26 13:56:16 +0200 | [diff] [blame] | 570 | free_init_pages("unused kernel memory", |
Linus Torvalds | e3ebadd | 2007-05-07 08:44:24 -0700 | [diff] [blame] | 571 | (unsigned long)(&__init_begin), |
| 572 | (unsigned long)(&__init_end)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | } |
| 574 | |
Arjan van de Ven | 67df197 | 2006-01-06 00:12:04 -0800 | [diff] [blame] | 575 | #ifdef CONFIG_DEBUG_RODATA |
| 576 | |
Arjan van de Ven | 67df197 | 2006-01-06 00:12:04 -0800 | [diff] [blame] | 577 | void mark_rodata_ro(void) |
| 578 | { |
Linus Torvalds | e3ebadd | 2007-05-07 08:44:24 -0700 | [diff] [blame] | 579 | unsigned long start = (unsigned long)_stext, end; |
Arjan van de Ven | 67df197 | 2006-01-06 00:12:04 -0800 | [diff] [blame] | 580 | |
Linus Torvalds | 602033e | 2007-07-26 12:07:21 -0700 | [diff] [blame] | 581 | #ifdef CONFIG_HOTPLUG_CPU |
| 582 | /* It must still be possible to apply SMP alternatives. */ |
| 583 | if (num_possible_cpus() > 1) |
| 584 | start = (unsigned long)_etext; |
| 585 | #endif |
| 586 | |
| 587 | #ifdef CONFIG_KPROBES |
| 588 | start = (unsigned long)__start_rodata; |
| 589 | #endif |
| 590 | |
Linus Torvalds | e3ebadd | 2007-05-07 08:44:24 -0700 | [diff] [blame] | 591 | end = (unsigned long)__end_rodata; |
| 592 | start = (start + PAGE_SIZE - 1) & PAGE_MASK; |
| 593 | end &= PAGE_MASK; |
| 594 | if (end <= start) |
| 595 | return; |
| 596 | |
| 597 | change_page_attr_addr(start, (end - start) >> PAGE_SHIFT, PAGE_KERNEL_RO); |
Arjan van de Ven | 67df197 | 2006-01-06 00:12:04 -0800 | [diff] [blame] | 598 | |
Jan Beulich | 6fb1475 | 2007-05-02 19:27:10 +0200 | [diff] [blame] | 599 | printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n", |
Linus Torvalds | e3ebadd | 2007-05-07 08:44:24 -0700 | [diff] [blame] | 600 | (end - start) >> 10); |
Arjan van de Ven | 67df197 | 2006-01-06 00:12:04 -0800 | [diff] [blame] | 601 | |
| 602 | /* |
| 603 | * change_page_attr_addr() requires a global_flush_tlb() call after it. |
| 604 | * We do this after the printk so that if something went wrong in the |
| 605 | * change, the printk gets out at least to give a better debug hint |
| 606 | * of who is the culprit. |
| 607 | */ |
| 608 | global_flush_tlb(); |
Andi Kleen | 0c42f39 | 2008-01-30 13:33:42 +0100 | [diff] [blame] | 609 | |
| 610 | #ifdef CONFIG_CPA_DEBUG |
| 611 | printk("Testing CPA: undo %lx-%lx\n", start, end); |
| 612 | change_page_attr_addr(start, (end - start) >> PAGE_SHIFT, PAGE_KERNEL); |
| 613 | global_flush_tlb(); |
| 614 | |
| 615 | printk("Testing CPA: again\n"); |
| 616 | change_page_attr_addr(start, (end - start) >> PAGE_SHIFT, PAGE_KERNEL_RO); |
| 617 | global_flush_tlb(); |
| 618 | #endif |
Arjan van de Ven | 67df197 | 2006-01-06 00:12:04 -0800 | [diff] [blame] | 619 | } |
| 620 | #endif |
| 621 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | #ifdef CONFIG_BLK_DEV_INITRD |
| 623 | void free_initrd_mem(unsigned long start, unsigned long end) |
| 624 | { |
Linus Torvalds | e3ebadd | 2007-05-07 08:44:24 -0700 | [diff] [blame] | 625 | free_init_pages("initrd memory", start, end); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | } |
| 627 | #endif |
| 628 | |
| 629 | void __init reserve_bootmem_generic(unsigned long phys, unsigned len) |
| 630 | { |
Matt Tolentino | 2b97690 | 2005-06-23 00:08:06 -0700 | [diff] [blame] | 631 | #ifdef CONFIG_NUMA |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | int nid = phys_to_nid(phys); |
Andi Kleen | 5e58a02 | 2006-11-14 16:57:46 +0100 | [diff] [blame] | 633 | #endif |
| 634 | unsigned long pfn = phys >> PAGE_SHIFT; |
| 635 | if (pfn >= end_pfn) { |
| 636 | /* This can happen with kdump kernels when accessing firmware |
| 637 | tables. */ |
| 638 | if (pfn < end_pfn_map) |
| 639 | return; |
| 640 | printk(KERN_ERR "reserve_bootmem: illegal reserve %lx %u\n", |
| 641 | phys, len); |
| 642 | return; |
| 643 | } |
| 644 | |
| 645 | /* Should check here against the e820 map to avoid double free */ |
| 646 | #ifdef CONFIG_NUMA |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | reserve_bootmem_node(NODE_DATA(nid), phys, len); |
| 648 | #else |
| 649 | reserve_bootmem(phys, len); |
| 650 | #endif |
Mel Gorman | 0e0b864 | 2006-09-27 01:49:56 -0700 | [diff] [blame] | 651 | if (phys+len <= MAX_DMA_PFN*PAGE_SIZE) { |
Andi Kleen | e18c687 | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 652 | dma_reserve += len / PAGE_SIZE; |
Mel Gorman | 0e0b864 | 2006-09-27 01:49:56 -0700 | [diff] [blame] | 653 | set_dma_reserve(dma_reserve); |
| 654 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | } |
| 656 | |
| 657 | int kern_addr_valid(unsigned long addr) |
| 658 | { |
| 659 | unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT; |
| 660 | pgd_t *pgd; |
| 661 | pud_t *pud; |
| 662 | pmd_t *pmd; |
| 663 | pte_t *pte; |
| 664 | |
| 665 | if (above != 0 && above != -1UL) |
| 666 | return 0; |
| 667 | |
| 668 | pgd = pgd_offset_k(addr); |
| 669 | if (pgd_none(*pgd)) |
| 670 | return 0; |
| 671 | |
| 672 | pud = pud_offset(pgd, addr); |
| 673 | if (pud_none(*pud)) |
| 674 | return 0; |
| 675 | |
| 676 | pmd = pmd_offset(pud, addr); |
| 677 | if (pmd_none(*pmd)) |
| 678 | return 0; |
| 679 | if (pmd_large(*pmd)) |
| 680 | return pfn_valid(pmd_pfn(*pmd)); |
| 681 | |
| 682 | pte = pte_offset_kernel(pmd, addr); |
| 683 | if (pte_none(*pte)) |
| 684 | return 0; |
| 685 | return pfn_valid(pte_pfn(*pte)); |
| 686 | } |
| 687 | |
Ernie Petrides | 103efcd | 2006-12-07 02:14:09 +0100 | [diff] [blame] | 688 | /* A pseudo VMA to allow ptrace access for the vsyscall page. This only |
Andi Kleen | 1e01441 | 2005-04-16 15:24:55 -0700 | [diff] [blame] | 689 | covers the 64bit vsyscall page now. 32bit has a real VMA now and does |
| 690 | not need special handling anymore. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | |
| 692 | static struct vm_area_struct gate_vma = { |
| 693 | .vm_start = VSYSCALL_START, |
Ernie Petrides | 103efcd | 2006-12-07 02:14:09 +0100 | [diff] [blame] | 694 | .vm_end = VSYSCALL_START + (VSYSCALL_MAPPED_PAGES << PAGE_SHIFT), |
| 695 | .vm_page_prot = PAGE_READONLY_EXEC, |
| 696 | .vm_flags = VM_READ | VM_EXEC |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | }; |
| 698 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | struct vm_area_struct *get_gate_vma(struct task_struct *tsk) |
| 700 | { |
| 701 | #ifdef CONFIG_IA32_EMULATION |
Andi Kleen | 1e01441 | 2005-04-16 15:24:55 -0700 | [diff] [blame] | 702 | if (test_tsk_thread_flag(tsk, TIF_IA32)) |
| 703 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | #endif |
| 705 | return &gate_vma; |
| 706 | } |
| 707 | |
| 708 | int in_gate_area(struct task_struct *task, unsigned long addr) |
| 709 | { |
| 710 | struct vm_area_struct *vma = get_gate_vma(task); |
Andi Kleen | 1e01441 | 2005-04-16 15:24:55 -0700 | [diff] [blame] | 711 | if (!vma) |
| 712 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | return (addr >= vma->vm_start) && (addr < vma->vm_end); |
| 714 | } |
| 715 | |
| 716 | /* Use this when you have no reliable task/vma, typically from interrupt |
| 717 | * context. It is less reliable than using the task's vma and may give |
| 718 | * false positives. |
| 719 | */ |
| 720 | int in_gate_area_no_task(unsigned long addr) |
| 721 | { |
Andi Kleen | 1e01441 | 2005-04-16 15:24:55 -0700 | [diff] [blame] | 722 | return (addr >= VSYSCALL_START) && (addr < VSYSCALL_END); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | } |
Zou Nan hai | 2e1c49d | 2007-06-01 00:46:28 -0700 | [diff] [blame] | 724 | |
Andi Kleen | 2aae950 | 2007-07-21 17:10:01 +0200 | [diff] [blame] | 725 | const char *arch_vma_name(struct vm_area_struct *vma) |
| 726 | { |
| 727 | if (vma->vm_mm && vma->vm_start == (long)vma->vm_mm->context.vdso) |
| 728 | return "[vdso]"; |
| 729 | if (vma == &gate_vma) |
| 730 | return "[vsyscall]"; |
| 731 | return NULL; |
| 732 | } |
Christoph Lameter | 0889eba | 2007-10-16 01:24:15 -0700 | [diff] [blame] | 733 | |
| 734 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
| 735 | /* |
| 736 | * Initialise the sparsemem vmemmap using huge-pages at the PMD level. |
| 737 | */ |
| 738 | int __meminit vmemmap_populate(struct page *start_page, |
| 739 | unsigned long size, int node) |
| 740 | { |
| 741 | unsigned long addr = (unsigned long)start_page; |
| 742 | unsigned long end = (unsigned long)(start_page + size); |
| 743 | unsigned long next; |
| 744 | pgd_t *pgd; |
| 745 | pud_t *pud; |
| 746 | pmd_t *pmd; |
| 747 | |
| 748 | for (; addr < end; addr = next) { |
| 749 | next = pmd_addr_end(addr, end); |
| 750 | |
| 751 | pgd = vmemmap_pgd_populate(addr, node); |
| 752 | if (!pgd) |
| 753 | return -ENOMEM; |
| 754 | pud = vmemmap_pud_populate(pgd, addr, node); |
| 755 | if (!pud) |
| 756 | return -ENOMEM; |
| 757 | |
| 758 | pmd = pmd_offset(pud, addr); |
| 759 | if (pmd_none(*pmd)) { |
| 760 | pte_t entry; |
| 761 | void *p = vmemmap_alloc_block(PMD_SIZE, node); |
| 762 | if (!p) |
| 763 | return -ENOMEM; |
| 764 | |
Jeremy Fitzhardinge | 27ec161 | 2008-01-30 13:31:09 +0100 | [diff] [blame] | 765 | entry = pfn_pte(__pa(p) >> PAGE_SHIFT, PAGE_KERNEL_LARGE); |
Christoph Lameter | 0889eba | 2007-10-16 01:24:15 -0700 | [diff] [blame] | 766 | set_pmd(pmd, __pmd(pte_val(entry))); |
| 767 | |
| 768 | printk(KERN_DEBUG " [%lx-%lx] PMD ->%p on node %d\n", |
| 769 | addr, addr + PMD_SIZE - 1, p, node); |
| 770 | } else |
| 771 | vmemmap_verify((pte_t *)pmd, node, addr, next); |
| 772 | } |
| 773 | |
| 774 | return 0; |
| 775 | } |
| 776 | #endif |