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> |
| 34 | #include <asm/system.h> |
| 35 | #include <asm/uaccess.h> |
| 36 | #include <asm/pgtable.h> |
| 37 | #include <asm/pgalloc.h> |
| 38 | #include <asm/dma.h> |
| 39 | #include <asm/fixmap.h> |
| 40 | #include <asm/e820.h> |
| 41 | #include <asm/apic.h> |
| 42 | #include <asm/tlb.h> |
| 43 | #include <asm/mmu_context.h> |
| 44 | #include <asm/proto.h> |
| 45 | #include <asm/smp.h> |
Andi Kleen | 2bc0414 | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 46 | #include <asm/sections.h> |
Thomas Gleixner | 718fc13 | 2008-01-30 13:30:17 +0100 | [diff] [blame] | 47 | #include <asm/kdebug.h> |
Thomas Gleixner | aaa64e0 | 2008-01-30 13:30:17 +0100 | [diff] [blame] | 48 | #include <asm/numa.h> |
Harvey Harrison | 7bfeab9 | 2008-02-12 12:12:01 -0800 | [diff] [blame] | 49 | #include <asm/cacheflush.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | |
Yinghai Lu | 064d25f | 2008-06-16 19:58:28 -0700 | [diff] [blame] | 51 | /* |
Yinghai Lu | 064d25f | 2008-06-16 19:58:28 -0700 | [diff] [blame] | 52 | * end_pfn only includes RAM, while max_pfn_mapped includes all e820 entries. |
| 53 | * The direct mapping extends to max_pfn_mapped, so that we can directly access |
| 54 | * apertures, ACPI and other tables without having to play with fixmaps. |
| 55 | */ |
| 56 | unsigned long max_pfn_mapped; |
| 57 | |
Andi Kleen | e18c687 | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 58 | static unsigned long dma_reserve __initdata; |
| 59 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); |
| 61 | |
Ingo Molnar | 00d1c5e | 2008-04-17 17:40:45 +0200 | [diff] [blame] | 62 | int direct_gbpages __meminitdata |
| 63 | #ifdef CONFIG_DIRECT_GBPAGES |
| 64 | = 1 |
| 65 | #endif |
| 66 | ; |
| 67 | |
| 68 | static int __init parse_direct_gbpages_off(char *arg) |
| 69 | { |
| 70 | direct_gbpages = 0; |
| 71 | return 0; |
| 72 | } |
| 73 | early_param("nogbpages", parse_direct_gbpages_off); |
| 74 | |
| 75 | static int __init parse_direct_gbpages_on(char *arg) |
| 76 | { |
| 77 | direct_gbpages = 1; |
| 78 | return 0; |
| 79 | } |
| 80 | early_param("gbpages", parse_direct_gbpages_on); |
| 81 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | /* |
| 83 | * NOTE: pagetable_init alloc all the fixmap pagetables contiguous on the |
| 84 | * physical space so we can cache the place of the first one and move |
| 85 | * around without checking the pgd every time. |
| 86 | */ |
| 87 | |
| 88 | void show_mem(void) |
| 89 | { |
Andi Kleen | e92343c | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 90 | long i, total = 0, reserved = 0; |
| 91 | long shared = 0, cached = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | struct page *page; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 93 | pg_data_t *pgdat; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | |
Andi Kleen | e92343c | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 95 | printk(KERN_INFO "Mem-info:\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | show_free_areas(); |
KAMEZAWA Hiroyuki | ec936fc | 2006-03-27 01:15:59 -0800 | [diff] [blame] | 97 | for_each_online_pgdat(pgdat) { |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 98 | for (i = 0; i < pgdat->node_spanned_pages; ++i) { |
| 99 | /* |
| 100 | * This loop can take a while with 256 GB and |
| 101 | * 4k pages so defer the NMI watchdog: |
| 102 | */ |
| 103 | if (unlikely(i % MAX_ORDER_NR_PAGES == 0)) |
Konrad Rzeszutek | ae32b12 | 2007-05-02 19:27:11 +0200 | [diff] [blame] | 104 | touch_nmi_watchdog(); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 105 | |
Bob Picco | 12710a5 | 2007-06-08 13:47:00 -0700 | [diff] [blame] | 106 | if (!pfn_valid(pgdat->node_start_pfn + i)) |
| 107 | continue; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 108 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | page = pfn_to_page(pgdat->node_start_pfn + i); |
| 110 | total++; |
Andi Kleen | e92343c | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 111 | if (PageReserved(page)) |
| 112 | reserved++; |
| 113 | else if (PageSwapCache(page)) |
| 114 | cached++; |
| 115 | else if (page_count(page)) |
| 116 | shared += page_count(page) - 1; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 117 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | } |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 119 | printk(KERN_INFO "%lu pages of RAM\n", total); |
| 120 | printk(KERN_INFO "%lu reserved pages\n", reserved); |
| 121 | printk(KERN_INFO "%lu pages shared\n", shared); |
| 122 | printk(KERN_INFO "%lu pages swap cached\n", cached); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | } |
| 124 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | int after_bootmem; |
| 126 | |
Andi Kleen | 5f44a66 | 2006-03-25 16:30:25 +0100 | [diff] [blame] | 127 | static __init void *spp_getpage(void) |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 128 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | void *ptr; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 130 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | if (after_bootmem) |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 132 | ptr = (void *) get_zeroed_page(GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | else |
| 134 | ptr = alloc_bootmem_pages(PAGE_SIZE); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 135 | |
| 136 | if (!ptr || ((unsigned long)ptr & ~PAGE_MASK)) { |
| 137 | panic("set_pte_phys: cannot allocate page data %s\n", |
| 138 | after_bootmem ? "after bootmem" : ""); |
| 139 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | |
Ingo Molnar | 10f22dd | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 141 | pr_debug("spp_getpage %p\n", ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 143 | return ptr; |
| 144 | } |
| 145 | |
Jeremy Fitzhardinge | d494a96 | 2008-06-17 11:41:59 -0700 | [diff] [blame] | 146 | void |
Eduardo Habkost | 0814e0b | 2008-06-25 00:19:22 -0400 | [diff] [blame] | 147 | 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] | 148 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | pud_t *pud; |
| 150 | pmd_t *pmd; |
Jeremy Fitzhardinge | d494a96 | 2008-06-17 11:41:59 -0700 | [diff] [blame] | 151 | pte_t *pte; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | |
Eduardo Habkost | 0814e0b | 2008-06-25 00:19:22 -0400 | [diff] [blame] | 153 | pud = pud_page + pud_index(vaddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | if (pud_none(*pud)) { |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 155 | pmd = (pmd_t *) spp_getpage(); |
Jeremy Fitzhardinge | bb23e40 | 2008-06-25 00:19:02 -0400 | [diff] [blame] | 156 | pud_populate(&init_mm, pud, pmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | if (pmd != pmd_offset(pud, 0)) { |
Ingo Molnar | 10f22dd | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 158 | printk(KERN_ERR "PAGETABLE BUG #01! %p <-> %p\n", |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 159 | pmd, pmd_offset(pud, 0)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | return; |
| 161 | } |
| 162 | } |
| 163 | pmd = pmd_offset(pud, vaddr); |
| 164 | if (pmd_none(*pmd)) { |
| 165 | pte = (pte_t *) spp_getpage(); |
Jeremy Fitzhardinge | bb23e40 | 2008-06-25 00:19:02 -0400 | [diff] [blame] | 166 | pmd_populate_kernel(&init_mm, pmd, pte); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | if (pte != pte_offset_kernel(pmd, 0)) { |
Ingo Molnar | 10f22dd | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 168 | printk(KERN_ERR "PAGETABLE BUG #02!\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | return; |
| 170 | } |
| 171 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | |
| 173 | pte = pte_offset_kernel(pmd, vaddr); |
Ingo Molnar | 70c9f59 | 2008-04-25 18:05:57 +0200 | [diff] [blame] | 174 | if (!pte_none(*pte) && pte_val(new_pte) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | pte_val(*pte) != (pte_val(new_pte) & __supported_pte_mask)) |
| 176 | pte_ERROR(*pte); |
| 177 | set_pte(pte, new_pte); |
| 178 | |
| 179 | /* |
| 180 | * It's enough to flush this one mapping. |
| 181 | * (PGE mappings get flushed as well) |
| 182 | */ |
| 183 | __flush_tlb_one(vaddr); |
| 184 | } |
| 185 | |
Eduardo Habkost | 0814e0b | 2008-06-25 00:19:22 -0400 | [diff] [blame] | 186 | void |
| 187 | set_pte_vaddr(unsigned long vaddr, pte_t pteval) |
| 188 | { |
| 189 | pgd_t *pgd; |
| 190 | pud_t *pud_page; |
| 191 | |
| 192 | pr_debug("set_pte_vaddr %lx to %lx\n", vaddr, native_pte_val(pteval)); |
| 193 | |
| 194 | pgd = pgd_offset_k(vaddr); |
| 195 | if (pgd_none(*pgd)) { |
| 196 | printk(KERN_ERR |
| 197 | "PGD FIXMAP MISSING, it should be setup in head.S!\n"); |
| 198 | return; |
| 199 | } |
| 200 | pud_page = (pud_t*)pgd_page_vaddr(*pgd); |
| 201 | set_pte_vaddr_pud(pud_page, vaddr, pteval); |
| 202 | } |
| 203 | |
Thomas Gleixner | 31eedd8 | 2008-02-15 17:29:12 +0100 | [diff] [blame] | 204 | /* |
Ingo Molnar | 88f3aec | 2008-02-21 11:04:11 +0100 | [diff] [blame] | 205 | * The head.S code sets up the kernel high mapping: |
| 206 | * |
| 207 | * from __START_KERNEL_map to __START_KERNEL_map + size (== _end-_text) |
Thomas Gleixner | 31eedd8 | 2008-02-15 17:29:12 +0100 | [diff] [blame] | 208 | * |
| 209 | * phys_addr holds the negative offset to the kernel, which is added |
| 210 | * to the compile time generated pmds. This results in invalid pmds up |
| 211 | * to the point where we hit the physaddr 0 mapping. |
| 212 | * |
| 213 | * We limit the mappings to the region from _text to _end. _end is |
| 214 | * rounded up to the 2MB boundary. This catches the invalid pmds as |
| 215 | * well, as they are located before _text: |
| 216 | */ |
| 217 | void __init cleanup_highmap(void) |
| 218 | { |
| 219 | unsigned long vaddr = __START_KERNEL_map; |
| 220 | unsigned long end = round_up((unsigned long)_end, PMD_SIZE) - 1; |
| 221 | pmd_t *pmd = level2_kernel_pgt; |
| 222 | pmd_t *last_pmd = pmd + PTRS_PER_PMD; |
| 223 | |
| 224 | for (; pmd < last_pmd; pmd++, vaddr += PMD_SIZE) { |
Hugh Dickins | 2884f11 | 2008-05-28 19:36:07 +0100 | [diff] [blame] | 225 | if (pmd_none(*pmd)) |
Thomas Gleixner | 31eedd8 | 2008-02-15 17:29:12 +0100 | [diff] [blame] | 226 | continue; |
| 227 | if (vaddr < (unsigned long) _text || vaddr > end) |
| 228 | set_pmd(pmd, __pmd(0)); |
| 229 | } |
| 230 | } |
| 231 | |
Andi Kleen | 7517527 | 2008-01-30 13:33:17 +0100 | [diff] [blame] | 232 | static unsigned long __initdata table_start; |
| 233 | static unsigned long __meminitdata table_end; |
Yinghai Lu | d86623a | 2008-06-24 14:57:29 -0700 | [diff] [blame] | 234 | static unsigned long __meminitdata table_top; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 236 | static __meminit void *alloc_low_page(unsigned long *phys) |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 237 | { |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 238 | unsigned long pfn = table_end++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | void *adr; |
| 240 | |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 241 | if (after_bootmem) { |
| 242 | adr = (void *)get_zeroed_page(GFP_ATOMIC); |
| 243 | *phys = __pa(adr); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 244 | |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 245 | return adr; |
| 246 | } |
| 247 | |
Yinghai Lu | d86623a | 2008-06-24 14:57:29 -0700 | [diff] [blame] | 248 | if (pfn >= table_top) |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 249 | panic("alloc_low_page: ran out of memory"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 251 | adr = early_ioremap(pfn * PAGE_SIZE, PAGE_SIZE); |
| 252 | memset(adr, 0, PAGE_SIZE); |
| 253 | *phys = pfn * PAGE_SIZE; |
| 254 | return adr; |
| 255 | } |
| 256 | |
| 257 | static __meminit void unmap_low_page(void *adr) |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 258 | { |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 259 | if (after_bootmem) |
| 260 | return; |
| 261 | |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 262 | early_iounmap(adr, PAGE_SIZE); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 263 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 265 | static void __meminit |
| 266 | phys_pte_init(pte_t *pte_page, unsigned long addr, unsigned long end) |
| 267 | { |
| 268 | unsigned pages = 0; |
| 269 | int i; |
| 270 | pte_t *pte = pte_page + pte_index(addr); |
| 271 | |
| 272 | for(i = pte_index(addr); i < PTRS_PER_PTE; i++, addr += PAGE_SIZE, pte++) { |
| 273 | |
| 274 | if (addr >= end) { |
| 275 | if (!after_bootmem) { |
| 276 | for(; i < PTRS_PER_PTE; i++, pte++) |
| 277 | set_pte(pte, __pte(0)); |
| 278 | } |
| 279 | break; |
| 280 | } |
| 281 | |
| 282 | if (pte_val(*pte)) |
| 283 | continue; |
| 284 | |
| 285 | if (0) |
| 286 | printk(" pte=%p addr=%lx pte=%016lx\n", |
| 287 | pte, addr, pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL).pte); |
| 288 | set_pte(pte, pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL)); |
| 289 | pages++; |
| 290 | } |
| 291 | update_page_count(PG_LEVEL_4K, pages); |
| 292 | } |
| 293 | |
| 294 | static void __meminit |
| 295 | phys_pte_update(pmd_t *pmd, unsigned long address, unsigned long end) |
| 296 | { |
| 297 | pte_t *pte = (pte_t *)pmd_page_vaddr(*pmd); |
| 298 | |
| 299 | phys_pte_init(pte, address, end); |
| 300 | } |
| 301 | |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 302 | static unsigned long __meminit |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 303 | 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] | 304 | { |
Andi Kleen | ce0c0e5 | 2008-05-02 11:46:49 +0200 | [diff] [blame] | 305 | unsigned long pages = 0; |
| 306 | |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 307 | int i = pmd_index(address); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 309 | for (; i < PTRS_PER_PMD; i++, address += PMD_SIZE) { |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 310 | unsigned long pte_phys; |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 311 | pmd_t *pmd = pmd_page + pmd_index(address); |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 312 | pte_t *pte; |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 313 | |
Jan Beulich | 5f51e13 | 2006-06-26 13:59:02 +0200 | [diff] [blame] | 314 | if (address >= end) { |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 315 | if (!after_bootmem) { |
Jan Beulich | 5f51e13 | 2006-06-26 13:59:02 +0200 | [diff] [blame] | 316 | for (; i < PTRS_PER_PMD; i++, pmd++) |
| 317 | set_pmd(pmd, __pmd(0)); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 318 | } |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 319 | break; |
| 320 | } |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 321 | |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 322 | if (pmd_val(*pmd)) { |
Jeremy Fitzhardinge | 22b4514 | 2008-06-26 12:02:49 -0700 | [diff] [blame] | 323 | if (!pmd_large(*pmd)) |
| 324 | phys_pte_update(pmd, address, end); |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 325 | continue; |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 326 | } |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 327 | |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 328 | if (cpu_has_pse) { |
| 329 | pages++; |
| 330 | set_pte((pte_t *)pmd, |
| 331 | pfn_pte(address >> PAGE_SHIFT, PAGE_KERNEL_LARGE)); |
| 332 | continue; |
| 333 | } |
| 334 | |
| 335 | pte = alloc_low_page(&pte_phys); |
| 336 | phys_pte_init(pte, address, end); |
| 337 | unmap_low_page(pte); |
| 338 | |
| 339 | pmd_populate_kernel(&init_mm, pmd, __va(pte_phys)); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 340 | } |
Andi Kleen | ce0c0e5 | 2008-05-02 11:46:49 +0200 | [diff] [blame] | 341 | update_page_count(PG_LEVEL_2M, pages); |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 342 | return address; |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 343 | } |
| 344 | |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 345 | static unsigned long __meminit |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 346 | phys_pmd_update(pud_t *pud, unsigned long address, unsigned long end) |
| 347 | { |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 348 | pmd_t *pmd = pmd_offset(pud, 0); |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 349 | unsigned long last_map_addr; |
| 350 | |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 351 | spin_lock(&init_mm.page_table_lock); |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 352 | last_map_addr = phys_pmd_init(pmd, address, end); |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 353 | spin_unlock(&init_mm.page_table_lock); |
| 354 | __flush_tlb_all(); |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 355 | return last_map_addr; |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 356 | } |
| 357 | |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 358 | static unsigned long __meminit |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 359 | phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end) |
| 360 | { |
Andi Kleen | ce0c0e5 | 2008-05-02 11:46:49 +0200 | [diff] [blame] | 361 | unsigned long pages = 0; |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 362 | unsigned long last_map_addr = end; |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 363 | int i = pud_index(addr); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 364 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 365 | for (; i < PTRS_PER_PUD; i++, addr = (addr & PUD_MASK) + PUD_SIZE) { |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 366 | unsigned long pmd_phys; |
| 367 | pud_t *pud = pud_page + pud_index(addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | pmd_t *pmd; |
| 369 | |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 370 | if (addr >= end) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 373 | if (!after_bootmem && |
| 374 | !e820_any_mapped(addr, addr+PUD_SIZE, 0)) { |
| 375 | set_pud(pud, __pud(0)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | continue; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 377 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 379 | if (pud_val(*pud)) { |
Andi Kleen | ef92576 | 2008-04-17 17:40:45 +0200 | [diff] [blame] | 380 | if (!pud_large(*pud)) |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 381 | last_map_addr = phys_pmd_update(pud, addr, end); |
Andi Kleen | ef92576 | 2008-04-17 17:40:45 +0200 | [diff] [blame] | 382 | continue; |
| 383 | } |
| 384 | |
| 385 | if (direct_gbpages) { |
Andi Kleen | ce0c0e5 | 2008-05-02 11:46:49 +0200 | [diff] [blame] | 386 | pages++; |
Andi Kleen | ef92576 | 2008-04-17 17:40:45 +0200 | [diff] [blame] | 387 | set_pte((pte_t *)pud, |
| 388 | pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL_LARGE)); |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 389 | last_map_addr = (addr & PUD_MASK) + PUD_SIZE; |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 390 | continue; |
| 391 | } |
| 392 | |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 393 | pmd = alloc_low_page(&pmd_phys); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 394 | |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 395 | spin_lock(&init_mm.page_table_lock); |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 396 | last_map_addr = phys_pmd_init(pmd, addr, end); |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 397 | unmap_low_page(pmd); |
| 398 | pud_populate(&init_mm, pud, __va(pmd_phys)); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 399 | spin_unlock(&init_mm.page_table_lock); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 400 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | } |
Andi Kleen | 1a2b441 | 2008-01-30 13:33:54 +0100 | [diff] [blame] | 402 | __flush_tlb_all(); |
Andi Kleen | ce0c0e5 | 2008-05-02 11:46:49 +0200 | [diff] [blame] | 403 | update_page_count(PG_LEVEL_1G, pages); |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 404 | |
Yinghai Lu | 1a0db38 | 2008-06-24 14:56:20 -0700 | [diff] [blame] | 405 | return last_map_addr; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 406 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 408 | static unsigned long __meminit |
| 409 | phys_pud_update(pgd_t *pgd, unsigned long addr, unsigned long end) |
| 410 | { |
| 411 | pud_t *pud; |
| 412 | |
| 413 | pud = (pud_t *)pgd_page_vaddr(*pgd); |
| 414 | |
| 415 | return phys_pud_init(pud, addr, end); |
| 416 | } |
| 417 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | static void __init find_early_table_space(unsigned long end) |
| 419 | { |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 420 | unsigned long puds, tables, start; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | |
| 422 | puds = (end + PUD_SIZE - 1) >> PUD_SHIFT; |
Andi Kleen | ef92576 | 2008-04-17 17:40:45 +0200 | [diff] [blame] | 423 | tables = round_up(puds * sizeof(pud_t), PAGE_SIZE); |
| 424 | if (!direct_gbpages) { |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 425 | unsigned long pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT; |
Andi Kleen | ef92576 | 2008-04-17 17:40:45 +0200 | [diff] [blame] | 426 | tables += round_up(pmds * sizeof(pmd_t), PAGE_SIZE); |
| 427 | } |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 428 | if (!cpu_has_pse) { |
| 429 | unsigned long ptes = (end + PAGE_SIZE - 1) >> PAGE_SHIFT; |
| 430 | tables += round_up(ptes * sizeof(pte_t), PAGE_SIZE); |
| 431 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 433 | /* |
| 434 | * RED-PEN putting page tables only on node 0 could |
| 435 | * cause a hotspot and fill up ZONE_DMA. The page tables |
| 436 | * need roughly 0.5KB per GB. |
| 437 | */ |
| 438 | start = 0x8000; |
Yinghai Lu | 24a5da7 | 2008-02-01 17:49:41 +0100 | [diff] [blame] | 439 | table_start = find_e820_area(start, end, tables, PAGE_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | if (table_start == -1UL) |
| 441 | panic("Cannot find space for the kernel page tables"); |
| 442 | |
| 443 | table_start >>= PAGE_SHIFT; |
| 444 | table_end = table_start; |
Yinghai Lu | d86623a | 2008-06-24 14:57:29 -0700 | [diff] [blame] | 445 | table_top = table_start + (tables >> PAGE_SHIFT); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 446 | |
Yinghai Lu | d86623a | 2008-06-24 14:57:29 -0700 | [diff] [blame] | 447 | printk(KERN_DEBUG "kernel direct mapping tables up to %lx @ %lx-%lx\n", |
| 448 | end, table_start << PAGE_SHIFT, table_top << PAGE_SHIFT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | } |
| 450 | |
Andi Kleen | ef92576 | 2008-04-17 17:40:45 +0200 | [diff] [blame] | 451 | static void __init init_gbpages(void) |
| 452 | { |
| 453 | if (direct_gbpages && cpu_has_gbpages) |
| 454 | printk(KERN_INFO "Using GB pages for direct mapping\n"); |
| 455 | else |
| 456 | direct_gbpages = 0; |
| 457 | } |
| 458 | |
Yinghai Lu | 0327318 | 2008-04-18 17:49:15 -0700 | [diff] [blame] | 459 | #ifdef CONFIG_MEMTEST |
Yinghai Lu | c64df70 | 2008-03-21 18:56:19 -0700 | [diff] [blame] | 460 | |
| 461 | static void __init memtest(unsigned long start_phys, unsigned long size, |
| 462 | unsigned pattern) |
Yinghai Lu | 272b9ca | 2008-03-20 23:58:33 -0700 | [diff] [blame] | 463 | { |
| 464 | unsigned long i; |
| 465 | unsigned long *start; |
| 466 | unsigned long start_bad; |
| 467 | unsigned long last_bad; |
| 468 | unsigned long val; |
| 469 | unsigned long start_phys_aligned; |
| 470 | unsigned long count; |
| 471 | unsigned long incr; |
| 472 | |
| 473 | switch (pattern) { |
| 474 | case 0: |
| 475 | val = 0UL; |
| 476 | break; |
| 477 | case 1: |
| 478 | val = -1UL; |
| 479 | break; |
| 480 | case 2: |
| 481 | val = 0x5555555555555555UL; |
| 482 | break; |
| 483 | case 3: |
| 484 | val = 0xaaaaaaaaaaaaaaaaUL; |
| 485 | break; |
| 486 | default: |
| 487 | return; |
| 488 | } |
| 489 | |
| 490 | incr = sizeof(unsigned long); |
| 491 | start_phys_aligned = ALIGN(start_phys, incr); |
| 492 | count = (size - (start_phys_aligned - start_phys))/incr; |
| 493 | start = __va(start_phys_aligned); |
| 494 | start_bad = 0; |
| 495 | last_bad = 0; |
| 496 | |
| 497 | for (i = 0; i < count; i++) |
| 498 | start[i] = val; |
| 499 | for (i = 0; i < count; i++, start++, start_phys_aligned += incr) { |
| 500 | if (*start != val) { |
| 501 | if (start_phys_aligned == last_bad + incr) { |
| 502 | last_bad += incr; |
| 503 | } else { |
| 504 | if (start_bad) { |
Yinghai Lu | dcfe946 | 2008-04-15 23:17:42 -0700 | [diff] [blame] | 505 | printk(KERN_CONT "\n %016lx bad mem addr %016lx - %016lx reserved", |
Yinghai Lu | 272b9ca | 2008-03-20 23:58:33 -0700 | [diff] [blame] | 506 | val, start_bad, last_bad + incr); |
| 507 | reserve_early(start_bad, last_bad - start_bad, "BAD RAM"); |
| 508 | } |
| 509 | start_bad = last_bad = start_phys_aligned; |
| 510 | } |
| 511 | } |
| 512 | } |
| 513 | if (start_bad) { |
Yinghai Lu | dcfe946 | 2008-04-15 23:17:42 -0700 | [diff] [blame] | 514 | printk(KERN_CONT "\n %016lx bad mem addr %016lx - %016lx reserved", |
Yinghai Lu | 272b9ca | 2008-03-20 23:58:33 -0700 | [diff] [blame] | 515 | val, start_bad, last_bad + incr); |
| 516 | reserve_early(start_bad, last_bad - start_bad, "BAD RAM"); |
| 517 | } |
| 518 | |
| 519 | } |
| 520 | |
Yinghai Lu | 0327318 | 2008-04-18 17:49:15 -0700 | [diff] [blame] | 521 | /* default is disabled */ |
| 522 | static int memtest_pattern __initdata; |
Yinghai Lu | c64df70 | 2008-03-21 18:56:19 -0700 | [diff] [blame] | 523 | |
Yinghai Lu | 272b9ca | 2008-03-20 23:58:33 -0700 | [diff] [blame] | 524 | static int __init parse_memtest(char *arg) |
| 525 | { |
| 526 | if (arg) |
Yinghai Lu | c64df70 | 2008-03-21 18:56:19 -0700 | [diff] [blame] | 527 | memtest_pattern = simple_strtoul(arg, NULL, 0); |
Yinghai Lu | 272b9ca | 2008-03-20 23:58:33 -0700 | [diff] [blame] | 528 | return 0; |
| 529 | } |
| 530 | |
| 531 | early_param("memtest", parse_memtest); |
| 532 | |
| 533 | static void __init early_memtest(unsigned long start, unsigned long end) |
| 534 | { |
Andrew Morton | 27df66a | 2008-07-03 10:14:10 +0200 | [diff] [blame] | 535 | u64 t_start, t_size; |
Yinghai Lu | 272b9ca | 2008-03-20 23:58:33 -0700 | [diff] [blame] | 536 | unsigned pattern; |
| 537 | |
Yinghai Lu | c64df70 | 2008-03-21 18:56:19 -0700 | [diff] [blame] | 538 | if (!memtest_pattern) |
| 539 | return; |
| 540 | |
| 541 | printk(KERN_INFO "early_memtest: pattern num %d", memtest_pattern); |
Yinghai Lu | 272b9ca | 2008-03-20 23:58:33 -0700 | [diff] [blame] | 542 | for (pattern = 0; pattern < memtest_pattern; pattern++) { |
| 543 | t_start = start; |
| 544 | t_size = 0; |
| 545 | while (t_start < end) { |
| 546 | t_start = find_e820_area_size(t_start, &t_size, 1); |
| 547 | |
| 548 | /* done ? */ |
| 549 | if (t_start >= end) |
| 550 | break; |
| 551 | if (t_start + t_size > end) |
| 552 | t_size = end - t_start; |
| 553 | |
Andrew Morton | 27df66a | 2008-07-03 10:14:10 +0200 | [diff] [blame] | 554 | printk(KERN_CONT "\n %016llx - %016llx pattern %d", |
| 555 | (unsigned long long)t_start, |
| 556 | (unsigned long long)t_start + t_size, pattern); |
Yinghai Lu | 272b9ca | 2008-03-20 23:58:33 -0700 | [diff] [blame] | 557 | |
| 558 | memtest(t_start, t_size, pattern); |
| 559 | |
| 560 | t_start += t_size; |
| 561 | } |
| 562 | } |
Yinghai Lu | c64df70 | 2008-03-21 18:56:19 -0700 | [diff] [blame] | 563 | printk(KERN_CONT "\n"); |
Yinghai Lu | 272b9ca | 2008-03-20 23:58:33 -0700 | [diff] [blame] | 564 | } |
Yinghai Lu | c64df70 | 2008-03-21 18:56:19 -0700 | [diff] [blame] | 565 | #else |
| 566 | static void __init early_memtest(unsigned long start, unsigned long end) |
| 567 | { |
| 568 | } |
| 569 | #endif |
Yinghai Lu | 272b9ca | 2008-03-20 23:58:33 -0700 | [diff] [blame] | 570 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 571 | /* |
| 572 | * Setup the direct mapping of the physical memory at PAGE_OFFSET. |
| 573 | * This runs before bootmem is initialized and gets pages directly from |
| 574 | * the physical memory. To access them they are temporarily mapped. |
| 575 | */ |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 576 | unsigned long __init_refok init_memory_mapping(unsigned long start, unsigned long end) |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 577 | { |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 578 | unsigned long next, last_map_addr = end; |
Yinghai Lu | 272b9ca | 2008-03-20 23:58:33 -0700 | [diff] [blame] | 579 | unsigned long start_phys = start, end_phys = end; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | |
Yinghai Lu | 272b9ca | 2008-03-20 23:58:33 -0700 | [diff] [blame] | 581 | printk(KERN_INFO "init_memory_mapping\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 583 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | * Find space for the kernel direct mapping tables. |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 585 | * |
| 586 | * Later we should allocate these tables in the local node of the |
| 587 | * memory mapped. Unfortunately this is done currently before the |
| 588 | * nodes are discovered. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | */ |
Andi Kleen | ef92576 | 2008-04-17 17:40:45 +0200 | [diff] [blame] | 590 | if (!after_bootmem) { |
| 591 | init_gbpages(); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 592 | find_early_table_space(end); |
Andi Kleen | ef92576 | 2008-04-17 17:40:45 +0200 | [diff] [blame] | 593 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | |
| 595 | start = (unsigned long)__va(start); |
| 596 | end = (unsigned long)__va(end); |
| 597 | |
| 598 | for (; start < end; start = next) { |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 599 | pgd_t *pgd = pgd_offset_k(start); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 600 | unsigned long pud_phys; |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 601 | pud_t *pud; |
| 602 | |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 603 | next = start + PGDIR_SIZE; |
| 604 | if (next > end) |
| 605 | next = end; |
| 606 | |
| 607 | if (pgd_val(*pgd)) { |
| 608 | last_map_addr = phys_pud_update(pgd, __pa(start), __pa(end)); |
| 609 | continue; |
| 610 | } |
| 611 | |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 612 | if (after_bootmem) |
Andi Kleen | d2ae5b5 | 2006-06-26 13:57:56 +0200 | [diff] [blame] | 613 | pud = pud_offset(pgd, start & PGDIR_MASK); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 614 | else |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 615 | pud = alloc_low_page(&pud_phys); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 616 | |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 617 | last_map_addr = phys_pud_init(pud, __pa(start), __pa(next)); |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 618 | unmap_low_page(pud); |
Jeremy Fitzhardinge | 574977a | 2008-07-01 16:46:33 -0700 | [diff] [blame^] | 619 | pgd_populate(&init_mm, pgd_offset_k(start), |
| 620 | __va(pud_phys)); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 621 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 623 | if (!after_bootmem) |
Glauber de Oliveira Costa | f51c945 | 2007-07-22 11:12:29 +0200 | [diff] [blame] | 624 | mmu_cr4_features = read_cr4(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | __flush_tlb_all(); |
Andi Kleen | 7517527 | 2008-01-30 13:33:17 +0100 | [diff] [blame] | 626 | |
Yinghai Lu | 24a5da7 | 2008-02-01 17:49:41 +0100 | [diff] [blame] | 627 | if (!after_bootmem) |
| 628 | reserve_early(table_start << PAGE_SHIFT, |
| 629 | table_end << PAGE_SHIFT, "PGTABLE"); |
Yinghai Lu | 272b9ca | 2008-03-20 23:58:33 -0700 | [diff] [blame] | 630 | |
| 631 | if (!after_bootmem) |
| 632 | early_memtest(start_phys, end_phys); |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 633 | |
Yinghai Lu | 1a0db38 | 2008-06-24 14:56:20 -0700 | [diff] [blame] | 634 | return last_map_addr >> PAGE_SHIFT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 635 | } |
| 636 | |
Matt Tolentino | 2b97690 | 2005-06-23 00:08:06 -0700 | [diff] [blame] | 637 | #ifndef CONFIG_NUMA |
Yinghai Lu | 1f75d7e | 2008-06-22 02:44:49 -0700 | [diff] [blame] | 638 | void __init initmem_init(unsigned long start_pfn, unsigned long end_pfn) |
| 639 | { |
| 640 | unsigned long bootmap_size, bootmap; |
| 641 | |
| 642 | bootmap_size = bootmem_bootmap_pages(end_pfn)<<PAGE_SHIFT; |
| 643 | bootmap = find_e820_area(0, end_pfn<<PAGE_SHIFT, bootmap_size, |
| 644 | PAGE_SIZE); |
| 645 | if (bootmap == -1L) |
| 646 | panic("Cannot find bootmem map of size %ld\n", bootmap_size); |
Yinghai Lu | 346cafe | 2008-06-23 03:06:14 -0700 | [diff] [blame] | 647 | /* don't touch min_low_pfn */ |
| 648 | bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap >> PAGE_SHIFT, |
| 649 | 0, end_pfn); |
Yinghai Lu | 1f75d7e | 2008-06-22 02:44:49 -0700 | [diff] [blame] | 650 | e820_register_active_regions(0, start_pfn, end_pfn); |
| 651 | free_bootmem_with_active_regions(0, end_pfn); |
| 652 | early_res_to_bootmem(0, end_pfn<<PAGE_SHIFT); |
| 653 | reserve_bootmem(bootmap, bootmap_size, BOOTMEM_DEFAULT); |
| 654 | } |
| 655 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | void __init paging_init(void) |
| 657 | { |
Mel Gorman | 6391af1 | 2006-10-11 01:20:39 -0700 | [diff] [blame] | 658 | unsigned long max_zone_pfns[MAX_NR_ZONES]; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 659 | |
Mel Gorman | 6391af1 | 2006-10-11 01:20:39 -0700 | [diff] [blame] | 660 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); |
| 661 | max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN; |
| 662 | max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN; |
Yinghai Lu | c987d12 | 2008-06-24 22:14:09 -0700 | [diff] [blame] | 663 | max_zone_pfns[ZONE_NORMAL] = max_pfn; |
Mel Gorman | 6391af1 | 2006-10-11 01:20:39 -0700 | [diff] [blame] | 664 | |
Yinghai Lu | c987d12 | 2008-06-24 22:14:09 -0700 | [diff] [blame] | 665 | memory_present(0, 0, max_pfn); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 666 | sparse_init(); |
Mel Gorman | 5cb248a | 2006-09-27 01:49:52 -0700 | [diff] [blame] | 667 | free_area_init_nodes(max_zone_pfns); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | } |
| 669 | #endif |
| 670 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 671 | /* |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 672 | * Memory hotplug specific functions |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 673 | */ |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 674 | #ifdef CONFIG_MEMORY_HOTPLUG |
| 675 | /* |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 676 | * Memory is added always to NORMAL zone. This means you will never get |
| 677 | * additional DMA/DMA32 memory. |
| 678 | */ |
| 679 | int arch_add_memory(int nid, u64 start, u64 size) |
| 680 | { |
| 681 | struct pglist_data *pgdat = NODE_DATA(nid); |
Christoph Lameter | 776ed98 | 2006-09-25 23:31:09 -0700 | [diff] [blame] | 682 | struct zone *zone = pgdat->node_zones + ZONE_NORMAL; |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 683 | unsigned long last_mapped_pfn, start_pfn = start >> PAGE_SHIFT; |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 684 | unsigned long nr_pages = size >> PAGE_SHIFT; |
| 685 | int ret; |
| 686 | |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 687 | last_mapped_pfn = init_memory_mapping(start, start + size-1); |
| 688 | if (last_mapped_pfn > max_pfn_mapped) |
| 689 | max_pfn_mapped = last_mapped_pfn; |
Keith Mannthey | 45e0b78 | 2006-09-30 23:27:09 -0700 | [diff] [blame] | 690 | |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 691 | ret = __add_pages(zone, start_pfn, nr_pages); |
Ingo Molnar | 10f22dd | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 692 | WARN_ON(1); |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 693 | |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 694 | return ret; |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 695 | } |
| 696 | EXPORT_SYMBOL_GPL(arch_add_memory); |
| 697 | |
Yasunori Goto | 8243229 | 2006-11-18 22:19:40 -0800 | [diff] [blame] | 698 | #if !defined(CONFIG_ACPI_NUMA) && defined(CONFIG_NUMA) |
Keith Mannthey | 4942e99 | 2006-09-30 23:27:06 -0700 | [diff] [blame] | 699 | int memory_add_physaddr_to_nid(u64 start) |
| 700 | { |
| 701 | return 0; |
| 702 | } |
Keith Mannthey | 8c2676a | 2006-09-30 23:27:07 -0700 | [diff] [blame] | 703 | EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid); |
Keith Mannthey | 4942e99 | 2006-09-30 23:27:06 -0700 | [diff] [blame] | 704 | #endif |
| 705 | |
Keith Mannthey | 45e0b78 | 2006-09-30 23:27:09 -0700 | [diff] [blame] | 706 | #endif /* CONFIG_MEMORY_HOTPLUG */ |
| 707 | |
Arjan van de Ven | ae531c2 | 2008-04-24 23:40:47 +0200 | [diff] [blame] | 708 | /* |
| 709 | * devmem_is_allowed() checks to see if /dev/mem access to a certain address |
| 710 | * is valid. The argument is a physical page number. |
| 711 | * |
| 712 | * |
| 713 | * On x86, access has to be given to the first megabyte of ram because that area |
| 714 | * contains bios code and data regions used by X and dosemu and similar apps. |
| 715 | * Access has to be given to non-kernel-ram areas as well, these contain the PCI |
| 716 | * mmio resources as well as potential bios/acpi data regions. |
| 717 | */ |
| 718 | int devmem_is_allowed(unsigned long pagenr) |
| 719 | { |
| 720 | if (pagenr <= 256) |
| 721 | return 1; |
| 722 | if (!page_is_ram(pagenr)) |
| 723 | return 1; |
| 724 | return 0; |
| 725 | } |
| 726 | |
| 727 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 728 | static struct kcore_list kcore_mem, kcore_vmalloc, kcore_kernel, |
| 729 | kcore_modules, kcore_vsyscall; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | |
| 731 | void __init mem_init(void) |
| 732 | { |
Andi Kleen | 0a43e4b | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 733 | long codesize, reservedpages, datasize, initsize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | |
Jon Mason | 0dc243a | 2006-06-26 13:58:11 +0200 | [diff] [blame] | 735 | pci_iommu_alloc(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | |
Yinghai Lu | 48ddb15 | 2008-01-30 13:32:36 +0100 | [diff] [blame] | 737 | /* clear_bss() already clear the empty_zero_page */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | |
| 739 | reservedpages = 0; |
| 740 | |
| 741 | /* this will put all low memory onto the freelists */ |
Matt Tolentino | 2b97690 | 2005-06-23 00:08:06 -0700 | [diff] [blame] | 742 | #ifdef CONFIG_NUMA |
Andi Kleen | 0a43e4b | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 743 | totalram_pages = numa_free_all_bootmem(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | #else |
Andi Kleen | 0a43e4b | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 745 | totalram_pages = free_all_bootmem(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | #endif |
Yinghai Lu | c987d12 | 2008-06-24 22:14:09 -0700 | [diff] [blame] | 747 | reservedpages = max_pfn - totalram_pages - |
| 748 | absent_pages_in_range(0, max_pfn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | after_bootmem = 1; |
| 750 | |
| 751 | codesize = (unsigned long) &_etext - (unsigned long) &_text; |
| 752 | datasize = (unsigned long) &_edata - (unsigned long) &_etext; |
| 753 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; |
| 754 | |
| 755 | /* Register memory areas for /proc/kcore */ |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 756 | kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT); |
| 757 | kclist_add(&kcore_vmalloc, (void *)VMALLOC_START, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | VMALLOC_END-VMALLOC_START); |
| 759 | kclist_add(&kcore_kernel, &_stext, _end - _stext); |
| 760 | kclist_add(&kcore_modules, (void *)MODULES_VADDR, MODULES_LEN); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 761 | kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | VSYSCALL_END - VSYSCALL_START); |
| 763 | |
Ingo Molnar | 10f22dd | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 764 | printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, " |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 765 | "%ldk reserved, %ldk data, %ldk init)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), |
Yinghai Lu | c987d12 | 2008-06-24 22:14:09 -0700 | [diff] [blame] | 767 | max_pfn << (PAGE_SHIFT-10), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | codesize >> 10, |
| 769 | reservedpages << (PAGE_SHIFT-10), |
| 770 | datasize >> 10, |
| 771 | initsize >> 10); |
Thomas Gleixner | 76ebd05 | 2008-02-09 23:24:09 +0100 | [diff] [blame] | 772 | |
| 773 | cpa_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | } |
| 775 | |
Gerd Hoffmann | d167a51 | 2006-06-26 13:56:16 +0200 | [diff] [blame] | 776 | void free_init_pages(char *what, unsigned long begin, unsigned long end) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | { |
Thomas Gleixner | bfc734b | 2008-02-09 23:24:09 +0100 | [diff] [blame] | 778 | unsigned long addr = begin; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | |
Thomas Gleixner | bfc734b | 2008-02-09 23:24:09 +0100 | [diff] [blame] | 780 | if (addr >= end) |
Gerd Hoffmann | d167a51 | 2006-06-26 13:56:16 +0200 | [diff] [blame] | 781 | return; |
| 782 | |
Ingo Molnar | ee01f11 | 2008-01-30 13:34:09 +0100 | [diff] [blame] | 783 | /* |
| 784 | * If debugging page accesses then do not free this memory but |
| 785 | * mark them not present - any buggy init-section access will |
| 786 | * create a kernel page fault: |
| 787 | */ |
| 788 | #ifdef CONFIG_DEBUG_PAGEALLOC |
| 789 | printk(KERN_INFO "debug: unmapping init memory %08lx..%08lx\n", |
| 790 | begin, PAGE_ALIGN(end)); |
| 791 | set_memory_np(begin, (end - begin) >> PAGE_SHIFT); |
| 792 | #else |
Jan Beulich | 6fb1475 | 2007-05-02 19:27:10 +0200 | [diff] [blame] | 793 | printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 794 | |
Thomas Gleixner | bfc734b | 2008-02-09 23:24:09 +0100 | [diff] [blame] | 795 | for (; addr < end; addr += PAGE_SIZE) { |
Linus Torvalds | e3ebadd | 2007-05-07 08:44:24 -0700 | [diff] [blame] | 796 | ClearPageReserved(virt_to_page(addr)); |
| 797 | init_page_count(virt_to_page(addr)); |
| 798 | memset((void *)(addr & ~(PAGE_SIZE-1)), |
| 799 | POISON_FREE_INITMEM, PAGE_SIZE); |
Linus Torvalds | e3ebadd | 2007-05-07 08:44:24 -0700 | [diff] [blame] | 800 | free_page(addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | totalram_pages++; |
| 802 | } |
Ingo Molnar | ee01f11 | 2008-01-30 13:34:09 +0100 | [diff] [blame] | 803 | #endif |
Gerd Hoffmann | d167a51 | 2006-06-26 13:56:16 +0200 | [diff] [blame] | 804 | } |
| 805 | |
| 806 | void free_initmem(void) |
| 807 | { |
Gerd Hoffmann | d167a51 | 2006-06-26 13:56:16 +0200 | [diff] [blame] | 808 | free_init_pages("unused kernel memory", |
Linus Torvalds | e3ebadd | 2007-05-07 08:44:24 -0700 | [diff] [blame] | 809 | (unsigned long)(&__init_begin), |
| 810 | (unsigned long)(&__init_end)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | } |
| 812 | |
Arjan van de Ven | 67df197 | 2006-01-06 00:12:04 -0800 | [diff] [blame] | 813 | #ifdef CONFIG_DEBUG_RODATA |
Arjan van de Ven | edeed30 | 2008-01-30 13:34:08 +0100 | [diff] [blame] | 814 | const int rodata_test_data = 0xC3; |
| 815 | EXPORT_SYMBOL_GPL(rodata_test_data); |
Arjan van de Ven | 67df197 | 2006-01-06 00:12:04 -0800 | [diff] [blame] | 816 | |
Arjan van de Ven | 67df197 | 2006-01-06 00:12:04 -0800 | [diff] [blame] | 817 | void mark_rodata_ro(void) |
| 818 | { |
Mathieu Desnoyers | 4e4eee0 | 2008-02-02 15:42:20 -0500 | [diff] [blame] | 819 | unsigned long start = PFN_ALIGN(_stext), end = PFN_ALIGN(__end_rodata); |
Arjan van de Ven | 67df197 | 2006-01-06 00:12:04 -0800 | [diff] [blame] | 820 | |
Jan Beulich | 6fb1475 | 2007-05-02 19:27:10 +0200 | [diff] [blame] | 821 | printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n", |
Linus Torvalds | e3ebadd | 2007-05-07 08:44:24 -0700 | [diff] [blame] | 822 | (end - start) >> 10); |
Arjan van de Ven | 984bb80 | 2008-02-06 22:39:45 +0100 | [diff] [blame] | 823 | set_memory_ro(start, (end - start) >> PAGE_SHIFT); |
| 824 | |
| 825 | /* |
| 826 | * The rodata section (but not the kernel text!) should also be |
| 827 | * not-executable. |
| 828 | */ |
| 829 | start = ((unsigned long)__start_rodata + PAGE_SIZE - 1) & PAGE_MASK; |
| 830 | set_memory_nx(start, (end - start) >> PAGE_SHIFT); |
Arjan van de Ven | 67df197 | 2006-01-06 00:12:04 -0800 | [diff] [blame] | 831 | |
Arjan van de Ven | 1a48725 | 2008-01-30 13:34:09 +0100 | [diff] [blame] | 832 | rodata_test(); |
| 833 | |
Andi Kleen | 0c42f39 | 2008-01-30 13:33:42 +0100 | [diff] [blame] | 834 | #ifdef CONFIG_CPA_DEBUG |
Ingo Molnar | 10f22dd | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 835 | 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] | 836 | set_memory_rw(start, (end-start) >> PAGE_SHIFT); |
Andi Kleen | 0c42f39 | 2008-01-30 13:33:42 +0100 | [diff] [blame] | 837 | |
Ingo Molnar | 10f22dd | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 838 | printk(KERN_INFO "Testing CPA: again\n"); |
Arjan van de Ven | 6d238cc | 2008-01-30 13:34:06 +0100 | [diff] [blame] | 839 | set_memory_ro(start, (end-start) >> PAGE_SHIFT); |
Andi Kleen | 0c42f39 | 2008-01-30 13:33:42 +0100 | [diff] [blame] | 840 | #endif |
Arjan van de Ven | 67df197 | 2006-01-06 00:12:04 -0800 | [diff] [blame] | 841 | } |
Mathieu Desnoyers | 4e4eee0 | 2008-02-02 15:42:20 -0500 | [diff] [blame] | 842 | |
Arjan van de Ven | 67df197 | 2006-01-06 00:12:04 -0800 | [diff] [blame] | 843 | #endif |
| 844 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | #ifdef CONFIG_BLK_DEV_INITRD |
| 846 | void free_initrd_mem(unsigned long start, unsigned long end) |
| 847 | { |
Linus Torvalds | e3ebadd | 2007-05-07 08:44:24 -0700 | [diff] [blame] | 848 | free_init_pages("initrd memory", start, end); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | } |
| 850 | #endif |
| 851 | |
Yinghai Lu | d2dbf34 | 2008-06-13 02:00:56 -0700 | [diff] [blame] | 852 | int __init reserve_bootmem_generic(unsigned long phys, unsigned long len, |
| 853 | int flags) |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 854 | { |
Matt Tolentino | 2b97690 | 2005-06-23 00:08:06 -0700 | [diff] [blame] | 855 | #ifdef CONFIG_NUMA |
Yinghai Lu | 8b3cd09e | 2008-03-18 12:50:21 -0700 | [diff] [blame] | 856 | int nid, next_nid; |
Yinghai Lu | 6a07a0e | 2008-06-23 14:02:36 -0700 | [diff] [blame] | 857 | int ret; |
Andi Kleen | 5e58a02 | 2006-11-14 16:57:46 +0100 | [diff] [blame] | 858 | #endif |
| 859 | unsigned long pfn = phys >> PAGE_SHIFT; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 860 | |
Yinghai Lu | c987d12 | 2008-06-24 22:14:09 -0700 | [diff] [blame] | 861 | if (pfn >= max_pfn) { |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 862 | /* |
| 863 | * This can happen with kdump kernels when accessing |
| 864 | * firmware tables: |
| 865 | */ |
Thomas Gleixner | 6779429 | 2008-03-21 21:27:10 +0100 | [diff] [blame] | 866 | if (pfn < max_pfn_mapped) |
Bernhard Walle | 8b2ef1d | 2008-06-08 15:46:30 +0200 | [diff] [blame] | 867 | return -EFAULT; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 868 | |
Yinghai Lu | 6a07a0e | 2008-06-23 14:02:36 -0700 | [diff] [blame] | 869 | printk(KERN_ERR "reserve_bootmem: illegal reserve %lx %lu\n", |
Andi Kleen | 5e58a02 | 2006-11-14 16:57:46 +0100 | [diff] [blame] | 870 | phys, len); |
Bernhard Walle | 8b2ef1d | 2008-06-08 15:46:30 +0200 | [diff] [blame] | 871 | return -EFAULT; |
Andi Kleen | 5e58a02 | 2006-11-14 16:57:46 +0100 | [diff] [blame] | 872 | } |
| 873 | |
| 874 | /* Should check here against the e820 map to avoid double free */ |
| 875 | #ifdef CONFIG_NUMA |
Yinghai Lu | 8b3cd09e | 2008-03-18 12:50:21 -0700 | [diff] [blame] | 876 | nid = phys_to_nid(phys); |
| 877 | next_nid = phys_to_nid(phys + len - 1); |
| 878 | if (nid == next_nid) |
Bernhard Walle | 8b2ef1d | 2008-06-08 15:46:30 +0200 | [diff] [blame] | 879 | ret = reserve_bootmem_node(NODE_DATA(nid), phys, len, flags); |
Yinghai Lu | 8b3cd09e | 2008-03-18 12:50:21 -0700 | [diff] [blame] | 880 | else |
Bernhard Walle | 8b2ef1d | 2008-06-08 15:46:30 +0200 | [diff] [blame] | 881 | ret = reserve_bootmem(phys, len, flags); |
| 882 | |
| 883 | if (ret != 0) |
| 884 | return ret; |
| 885 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 886 | #else |
Bernhard Walle | 72a7fe3 | 2008-02-07 00:15:17 -0800 | [diff] [blame] | 887 | reserve_bootmem(phys, len, BOOTMEM_DEFAULT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | #endif |
Yinghai Lu | 8b3cd09e | 2008-03-18 12:50:21 -0700 | [diff] [blame] | 889 | |
Mel Gorman | 0e0b864 | 2006-09-27 01:49:56 -0700 | [diff] [blame] | 890 | if (phys+len <= MAX_DMA_PFN*PAGE_SIZE) { |
Andi Kleen | e18c687 | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 891 | dma_reserve += len / PAGE_SIZE; |
Mel Gorman | 0e0b864 | 2006-09-27 01:49:56 -0700 | [diff] [blame] | 892 | set_dma_reserve(dma_reserve); |
| 893 | } |
Bernhard Walle | 8b2ef1d | 2008-06-08 15:46:30 +0200 | [diff] [blame] | 894 | |
| 895 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | } |
| 897 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 898 | int kern_addr_valid(unsigned long addr) |
| 899 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 901 | pgd_t *pgd; |
| 902 | pud_t *pud; |
| 903 | pmd_t *pmd; |
| 904 | pte_t *pte; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 905 | |
| 906 | if (above != 0 && above != -1UL) |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 907 | return 0; |
| 908 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | pgd = pgd_offset_k(addr); |
| 910 | if (pgd_none(*pgd)) |
| 911 | return 0; |
| 912 | |
| 913 | pud = pud_offset(pgd, addr); |
| 914 | if (pud_none(*pud)) |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 915 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 916 | |
| 917 | pmd = pmd_offset(pud, addr); |
| 918 | if (pmd_none(*pmd)) |
| 919 | return 0; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 920 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 921 | if (pmd_large(*pmd)) |
| 922 | return pfn_valid(pmd_pfn(*pmd)); |
| 923 | |
| 924 | pte = pte_offset_kernel(pmd, addr); |
| 925 | if (pte_none(*pte)) |
| 926 | return 0; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 927 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 928 | return pfn_valid(pte_pfn(*pte)); |
| 929 | } |
| 930 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 931 | /* |
| 932 | * A pseudo VMA to allow ptrace access for the vsyscall page. This only |
| 933 | * covers the 64bit vsyscall page now. 32bit has a real VMA now and does |
| 934 | * not need special handling anymore: |
| 935 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 936 | static struct vm_area_struct gate_vma = { |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 937 | .vm_start = VSYSCALL_START, |
| 938 | .vm_end = VSYSCALL_START + (VSYSCALL_MAPPED_PAGES * PAGE_SIZE), |
| 939 | .vm_page_prot = PAGE_READONLY_EXEC, |
| 940 | .vm_flags = VM_READ | VM_EXEC |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 941 | }; |
| 942 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 943 | struct vm_area_struct *get_gate_vma(struct task_struct *tsk) |
| 944 | { |
| 945 | #ifdef CONFIG_IA32_EMULATION |
Andi Kleen | 1e01441 | 2005-04-16 15:24:55 -0700 | [diff] [blame] | 946 | if (test_tsk_thread_flag(tsk, TIF_IA32)) |
| 947 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 948 | #endif |
| 949 | return &gate_vma; |
| 950 | } |
| 951 | |
| 952 | int in_gate_area(struct task_struct *task, unsigned long addr) |
| 953 | { |
| 954 | struct vm_area_struct *vma = get_gate_vma(task); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 955 | |
Andi Kleen | 1e01441 | 2005-04-16 15:24:55 -0700 | [diff] [blame] | 956 | if (!vma) |
| 957 | return 0; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 958 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | return (addr >= vma->vm_start) && (addr < vma->vm_end); |
| 960 | } |
| 961 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 962 | /* |
| 963 | * Use this when you have no reliable task/vma, typically from interrupt |
| 964 | * context. It is less reliable than using the task's vma and may give |
| 965 | * false positives: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 966 | */ |
| 967 | int in_gate_area_no_task(unsigned long addr) |
| 968 | { |
Andi Kleen | 1e01441 | 2005-04-16 15:24:55 -0700 | [diff] [blame] | 969 | return (addr >= VSYSCALL_START) && (addr < VSYSCALL_END); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | } |
Zou Nan hai | 2e1c49d | 2007-06-01 00:46:28 -0700 | [diff] [blame] | 971 | |
Andi Kleen | 2aae950 | 2007-07-21 17:10:01 +0200 | [diff] [blame] | 972 | const char *arch_vma_name(struct vm_area_struct *vma) |
| 973 | { |
| 974 | if (vma->vm_mm && vma->vm_start == (long)vma->vm_mm->context.vdso) |
| 975 | return "[vdso]"; |
| 976 | if (vma == &gate_vma) |
| 977 | return "[vsyscall]"; |
| 978 | return NULL; |
| 979 | } |
Christoph Lameter | 0889eba | 2007-10-16 01:24:15 -0700 | [diff] [blame] | 980 | |
| 981 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
| 982 | /* |
| 983 | * Initialise the sparsemem vmemmap using huge-pages at the PMD level. |
| 984 | */ |
Yinghai Lu | c2b91e2 | 2008-04-12 01:19:24 -0700 | [diff] [blame] | 985 | static long __meminitdata addr_start, addr_end; |
| 986 | static void __meminitdata *p_start, *p_end; |
| 987 | static int __meminitdata node_start; |
| 988 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 989 | int __meminit |
| 990 | vmemmap_populate(struct page *start_page, unsigned long size, int node) |
Christoph Lameter | 0889eba | 2007-10-16 01:24:15 -0700 | [diff] [blame] | 991 | { |
| 992 | unsigned long addr = (unsigned long)start_page; |
| 993 | unsigned long end = (unsigned long)(start_page + size); |
| 994 | unsigned long next; |
| 995 | pgd_t *pgd; |
| 996 | pud_t *pud; |
| 997 | pmd_t *pmd; |
| 998 | |
| 999 | for (; addr < end; addr = next) { |
Jeremy Fitzhardinge | 7c934d3 | 2008-06-25 00:19:20 -0400 | [diff] [blame] | 1000 | void *p = NULL; |
Christoph Lameter | 0889eba | 2007-10-16 01:24:15 -0700 | [diff] [blame] | 1001 | |
| 1002 | pgd = vmemmap_pgd_populate(addr, node); |
| 1003 | if (!pgd) |
| 1004 | return -ENOMEM; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1005 | |
Christoph Lameter | 0889eba | 2007-10-16 01:24:15 -0700 | [diff] [blame] | 1006 | pud = vmemmap_pud_populate(pgd, addr, node); |
| 1007 | if (!pud) |
| 1008 | return -ENOMEM; |
| 1009 | |
Jeremy Fitzhardinge | 7c934d3 | 2008-06-25 00:19:20 -0400 | [diff] [blame] | 1010 | if (!cpu_has_pse) { |
| 1011 | next = (addr + PAGE_SIZE) & PAGE_MASK; |
| 1012 | pmd = vmemmap_pmd_populate(pud, addr, node); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1013 | |
Jeremy Fitzhardinge | 7c934d3 | 2008-06-25 00:19:20 -0400 | [diff] [blame] | 1014 | if (!pmd) |
| 1015 | return -ENOMEM; |
| 1016 | |
| 1017 | p = vmemmap_pte_populate(pmd, addr, node); |
| 1018 | |
Christoph Lameter | 0889eba | 2007-10-16 01:24:15 -0700 | [diff] [blame] | 1019 | if (!p) |
| 1020 | return -ENOMEM; |
| 1021 | |
Jeremy Fitzhardinge | 7c934d3 | 2008-06-25 00:19:20 -0400 | [diff] [blame] | 1022 | addr_end = addr + PAGE_SIZE; |
| 1023 | p_end = p + PAGE_SIZE; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1024 | } else { |
Jeremy Fitzhardinge | 7c934d3 | 2008-06-25 00:19:20 -0400 | [diff] [blame] | 1025 | next = pmd_addr_end(addr, end); |
| 1026 | |
| 1027 | pmd = pmd_offset(pud, addr); |
| 1028 | if (pmd_none(*pmd)) { |
| 1029 | pte_t entry; |
| 1030 | |
| 1031 | p = vmemmap_alloc_block(PMD_SIZE, node); |
| 1032 | if (!p) |
| 1033 | return -ENOMEM; |
| 1034 | |
| 1035 | entry = pfn_pte(__pa(p) >> PAGE_SHIFT, |
| 1036 | PAGE_KERNEL_LARGE); |
| 1037 | set_pmd(pmd, __pmd(pte_val(entry))); |
| 1038 | |
| 1039 | addr_end = addr + PMD_SIZE; |
| 1040 | p_end = p + PMD_SIZE; |
| 1041 | |
| 1042 | /* check to see if we have contiguous blocks */ |
| 1043 | if (p_end != p || node_start != node) { |
| 1044 | if (p_start) |
| 1045 | printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n", |
| 1046 | addr_start, addr_end-1, p_start, p_end-1, node_start); |
| 1047 | addr_start = addr; |
| 1048 | node_start = node; |
| 1049 | p_start = p; |
| 1050 | } |
| 1051 | } else |
| 1052 | vmemmap_verify((pte_t *)pmd, node, addr, next); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 1053 | } |
Jeremy Fitzhardinge | 7c934d3 | 2008-06-25 00:19:20 -0400 | [diff] [blame] | 1054 | |
Christoph Lameter | 0889eba | 2007-10-16 01:24:15 -0700 | [diff] [blame] | 1055 | } |
Christoph Lameter | 0889eba | 2007-10-16 01:24:15 -0700 | [diff] [blame] | 1056 | return 0; |
| 1057 | } |
Yinghai Lu | c2b91e2 | 2008-04-12 01:19:24 -0700 | [diff] [blame] | 1058 | |
| 1059 | void __meminit vmemmap_populate_print_last(void) |
| 1060 | { |
| 1061 | if (p_start) { |
| 1062 | printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n", |
| 1063 | addr_start, addr_end-1, p_start, p_end-1, node_start); |
| 1064 | p_start = NULL; |
| 1065 | p_end = NULL; |
| 1066 | node_start = 0; |
| 1067 | } |
| 1068 | } |
Christoph Lameter | 0889eba | 2007-10-16 01:24:15 -0700 | [diff] [blame] | 1069 | #endif |