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 |
| 147 | set_pte_vaddr(unsigned long vaddr, pte_t new_pte) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | { |
| 149 | pgd_t *pgd; |
| 150 | pud_t *pud; |
| 151 | pmd_t *pmd; |
Jeremy Fitzhardinge | d494a96 | 2008-06-17 11:41:59 -0700 | [diff] [blame] | 152 | pte_t *pte; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | |
Jeremy Fitzhardinge | d494a96 | 2008-06-17 11:41:59 -0700 | [diff] [blame] | 154 | pr_debug("set_pte_vaddr %lx to %lx\n", vaddr, native_pte_val(new_pte)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | |
| 156 | pgd = pgd_offset_k(vaddr); |
| 157 | if (pgd_none(*pgd)) { |
Ingo Molnar | 10f22dd | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 158 | printk(KERN_ERR |
| 159 | "PGD FIXMAP MISSING, it should be setup in head.S!\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | return; |
| 161 | } |
| 162 | pud = pud_offset(pgd, vaddr); |
| 163 | if (pud_none(*pud)) { |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 164 | pmd = (pmd_t *) spp_getpage(); |
Jeremy Fitzhardinge | bb23e40 | 2008-06-25 00:19:02 -0400 | [diff] [blame] | 165 | pud_populate(&init_mm, pud, pmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | if (pmd != pmd_offset(pud, 0)) { |
Ingo Molnar | 10f22dd | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 167 | printk(KERN_ERR "PAGETABLE BUG #01! %p <-> %p\n", |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 168 | pmd, pmd_offset(pud, 0)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | return; |
| 170 | } |
| 171 | } |
| 172 | pmd = pmd_offset(pud, vaddr); |
| 173 | if (pmd_none(*pmd)) { |
| 174 | pte = (pte_t *) spp_getpage(); |
Jeremy Fitzhardinge | bb23e40 | 2008-06-25 00:19:02 -0400 | [diff] [blame] | 175 | pmd_populate_kernel(&init_mm, pmd, pte); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | if (pte != pte_offset_kernel(pmd, 0)) { |
Ingo Molnar | 10f22dd | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 177 | printk(KERN_ERR "PAGETABLE BUG #02!\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | return; |
| 179 | } |
| 180 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | |
| 182 | pte = pte_offset_kernel(pmd, vaddr); |
Ingo Molnar | 70c9f59 | 2008-04-25 18:05:57 +0200 | [diff] [blame] | 183 | if (!pte_none(*pte) && pte_val(new_pte) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | pte_val(*pte) != (pte_val(new_pte) & __supported_pte_mask)) |
| 185 | pte_ERROR(*pte); |
| 186 | set_pte(pte, new_pte); |
| 187 | |
| 188 | /* |
| 189 | * It's enough to flush this one mapping. |
| 190 | * (PGE mappings get flushed as well) |
| 191 | */ |
| 192 | __flush_tlb_one(vaddr); |
| 193 | } |
| 194 | |
Thomas Gleixner | 31eedd8 | 2008-02-15 17:29:12 +0100 | [diff] [blame] | 195 | /* |
Ingo Molnar | 88f3aec | 2008-02-21 11:04:11 +0100 | [diff] [blame] | 196 | * The head.S code sets up the kernel high mapping: |
| 197 | * |
| 198 | * from __START_KERNEL_map to __START_KERNEL_map + size (== _end-_text) |
Thomas Gleixner | 31eedd8 | 2008-02-15 17:29:12 +0100 | [diff] [blame] | 199 | * |
| 200 | * phys_addr holds the negative offset to the kernel, which is added |
| 201 | * to the compile time generated pmds. This results in invalid pmds up |
| 202 | * to the point where we hit the physaddr 0 mapping. |
| 203 | * |
| 204 | * We limit the mappings to the region from _text to _end. _end is |
| 205 | * rounded up to the 2MB boundary. This catches the invalid pmds as |
| 206 | * well, as they are located before _text: |
| 207 | */ |
| 208 | void __init cleanup_highmap(void) |
| 209 | { |
| 210 | unsigned long vaddr = __START_KERNEL_map; |
| 211 | unsigned long end = round_up((unsigned long)_end, PMD_SIZE) - 1; |
| 212 | pmd_t *pmd = level2_kernel_pgt; |
| 213 | pmd_t *last_pmd = pmd + PTRS_PER_PMD; |
| 214 | |
| 215 | for (; pmd < last_pmd; pmd++, vaddr += PMD_SIZE) { |
Hugh Dickins | 2884f11 | 2008-05-28 19:36:07 +0100 | [diff] [blame] | 216 | if (pmd_none(*pmd)) |
Thomas Gleixner | 31eedd8 | 2008-02-15 17:29:12 +0100 | [diff] [blame] | 217 | continue; |
| 218 | if (vaddr < (unsigned long) _text || vaddr > end) |
| 219 | set_pmd(pmd, __pmd(0)); |
| 220 | } |
| 221 | } |
| 222 | |
Andi Kleen | 7517527 | 2008-01-30 13:33:17 +0100 | [diff] [blame] | 223 | static unsigned long __initdata table_start; |
| 224 | static unsigned long __meminitdata table_end; |
Yinghai Lu | d86623a | 2008-06-24 14:57:29 -0700 | [diff] [blame] | 225 | static unsigned long __meminitdata table_top; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 227 | static __meminit void *alloc_low_page(unsigned long *phys) |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 228 | { |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 229 | unsigned long pfn = table_end++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | void *adr; |
| 231 | |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 232 | if (after_bootmem) { |
| 233 | adr = (void *)get_zeroed_page(GFP_ATOMIC); |
| 234 | *phys = __pa(adr); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 235 | |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 236 | return adr; |
| 237 | } |
| 238 | |
Yinghai Lu | d86623a | 2008-06-24 14:57:29 -0700 | [diff] [blame] | 239 | if (pfn >= table_top) |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 240 | panic("alloc_low_page: ran out of memory"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 242 | adr = early_ioremap(pfn * PAGE_SIZE, PAGE_SIZE); |
| 243 | memset(adr, 0, PAGE_SIZE); |
| 244 | *phys = pfn * PAGE_SIZE; |
| 245 | return adr; |
| 246 | } |
| 247 | |
| 248 | static __meminit void unmap_low_page(void *adr) |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 249 | { |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 250 | if (after_bootmem) |
| 251 | return; |
| 252 | |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 253 | early_iounmap(adr, PAGE_SIZE); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 254 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 256 | static unsigned long __meminit |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 257 | 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] | 258 | { |
Andi Kleen | ce0c0e5 | 2008-05-02 11:46:49 +0200 | [diff] [blame] | 259 | unsigned long pages = 0; |
| 260 | |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 261 | int i = pmd_index(address); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 263 | for (; i < PTRS_PER_PMD; i++, address += PMD_SIZE) { |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 264 | pmd_t *pmd = pmd_page + pmd_index(address); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 265 | |
Jan Beulich | 5f51e13 | 2006-06-26 13:59:02 +0200 | [diff] [blame] | 266 | if (address >= end) { |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 267 | if (!after_bootmem) { |
Jan Beulich | 5f51e13 | 2006-06-26 13:59:02 +0200 | [diff] [blame] | 268 | for (; i < PTRS_PER_PMD; i++, pmd++) |
| 269 | set_pmd(pmd, __pmd(0)); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 270 | } |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 271 | break; |
| 272 | } |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 273 | |
| 274 | if (pmd_val(*pmd)) |
| 275 | continue; |
| 276 | |
Andi Kleen | ce0c0e5 | 2008-05-02 11:46:49 +0200 | [diff] [blame] | 277 | pages++; |
Andi Kleen | d4f71f7 | 2008-02-04 16:48:09 +0100 | [diff] [blame] | 278 | set_pte((pte_t *)pmd, |
| 279 | pfn_pte(address >> PAGE_SHIFT, PAGE_KERNEL_LARGE)); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 280 | } |
Andi Kleen | ce0c0e5 | 2008-05-02 11:46:49 +0200 | [diff] [blame] | 281 | update_page_count(PG_LEVEL_2M, pages); |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 282 | return address; |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 283 | } |
| 284 | |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 285 | static unsigned long __meminit |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 286 | phys_pmd_update(pud_t *pud, unsigned long address, unsigned long end) |
| 287 | { |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 288 | pmd_t *pmd = pmd_offset(pud, 0); |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 289 | unsigned long last_map_addr; |
| 290 | |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 291 | spin_lock(&init_mm.page_table_lock); |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 292 | last_map_addr = phys_pmd_init(pmd, address, end); |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 293 | spin_unlock(&init_mm.page_table_lock); |
| 294 | __flush_tlb_all(); |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 295 | return last_map_addr; |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 296 | } |
| 297 | |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 298 | static unsigned long __meminit |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 299 | phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end) |
| 300 | { |
Andi Kleen | ce0c0e5 | 2008-05-02 11:46:49 +0200 | [diff] [blame] | 301 | unsigned long pages = 0; |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 302 | unsigned long last_map_addr = end; |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 303 | int i = pud_index(addr); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 304 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 305 | for (; i < PTRS_PER_PUD; i++, addr = (addr & PUD_MASK) + PUD_SIZE) { |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 306 | unsigned long pmd_phys; |
| 307 | pud_t *pud = pud_page + pud_index(addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | pmd_t *pmd; |
| 309 | |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 310 | if (addr >= end) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 313 | if (!after_bootmem && |
| 314 | !e820_any_mapped(addr, addr+PUD_SIZE, 0)) { |
| 315 | set_pud(pud, __pud(0)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | continue; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 317 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 319 | if (pud_val(*pud)) { |
Andi Kleen | ef92576 | 2008-04-17 17:40:45 +0200 | [diff] [blame] | 320 | if (!pud_large(*pud)) |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 321 | last_map_addr = phys_pmd_update(pud, addr, end); |
Andi Kleen | ef92576 | 2008-04-17 17:40:45 +0200 | [diff] [blame] | 322 | continue; |
| 323 | } |
| 324 | |
| 325 | if (direct_gbpages) { |
Andi Kleen | ce0c0e5 | 2008-05-02 11:46:49 +0200 | [diff] [blame] | 326 | pages++; |
Andi Kleen | ef92576 | 2008-04-17 17:40:45 +0200 | [diff] [blame] | 327 | set_pte((pte_t *)pud, |
| 328 | pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL_LARGE)); |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 329 | last_map_addr = (addr & PUD_MASK) + PUD_SIZE; |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 330 | continue; |
| 331 | } |
| 332 | |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 333 | pmd = alloc_low_page(&pmd_phys); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 334 | |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 335 | spin_lock(&init_mm.page_table_lock); |
Jeremy Fitzhardinge | bb23e40 | 2008-06-25 00:19:02 -0400 | [diff] [blame] | 336 | pud_populate(&init_mm, pud, __va(pmd_phys)); |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 337 | last_map_addr = phys_pmd_init(pmd, addr, end); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 338 | spin_unlock(&init_mm.page_table_lock); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 339 | |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 340 | unmap_low_page(pmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | } |
Andi Kleen | 1a2b441 | 2008-01-30 13:33:54 +0100 | [diff] [blame] | 342 | __flush_tlb_all(); |
Andi Kleen | ce0c0e5 | 2008-05-02 11:46:49 +0200 | [diff] [blame] | 343 | update_page_count(PG_LEVEL_1G, pages); |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 344 | |
Yinghai Lu | 1a0db38 | 2008-06-24 14:56:20 -0700 | [diff] [blame] | 345 | return last_map_addr; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 346 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | |
| 348 | static void __init find_early_table_space(unsigned long end) |
| 349 | { |
Andi Kleen | 6c5acd1 | 2006-01-11 22:46:57 +0100 | [diff] [blame] | 350 | unsigned long puds, pmds, tables, start; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | |
| 352 | puds = (end + PUD_SIZE - 1) >> PUD_SHIFT; |
Andi Kleen | ef92576 | 2008-04-17 17:40:45 +0200 | [diff] [blame] | 353 | tables = round_up(puds * sizeof(pud_t), PAGE_SIZE); |
| 354 | if (!direct_gbpages) { |
| 355 | pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT; |
| 356 | tables += round_up(pmds * sizeof(pmd_t), PAGE_SIZE); |
| 357 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 359 | /* |
| 360 | * RED-PEN putting page tables only on node 0 could |
| 361 | * cause a hotspot and fill up ZONE_DMA. The page tables |
| 362 | * need roughly 0.5KB per GB. |
| 363 | */ |
| 364 | start = 0x8000; |
Yinghai Lu | 24a5da7 | 2008-02-01 17:49:41 +0100 | [diff] [blame] | 365 | table_start = find_e820_area(start, end, tables, PAGE_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | if (table_start == -1UL) |
| 367 | panic("Cannot find space for the kernel page tables"); |
| 368 | |
| 369 | table_start >>= PAGE_SHIFT; |
| 370 | table_end = table_start; |
Yinghai Lu | d86623a | 2008-06-24 14:57:29 -0700 | [diff] [blame] | 371 | table_top = table_start + (tables >> PAGE_SHIFT); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 372 | |
Yinghai Lu | d86623a | 2008-06-24 14:57:29 -0700 | [diff] [blame] | 373 | printk(KERN_DEBUG "kernel direct mapping tables up to %lx @ %lx-%lx\n", |
| 374 | end, table_start << PAGE_SHIFT, table_top << PAGE_SHIFT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | } |
| 376 | |
Andi Kleen | ef92576 | 2008-04-17 17:40:45 +0200 | [diff] [blame] | 377 | static void __init init_gbpages(void) |
| 378 | { |
| 379 | if (direct_gbpages && cpu_has_gbpages) |
| 380 | printk(KERN_INFO "Using GB pages for direct mapping\n"); |
| 381 | else |
| 382 | direct_gbpages = 0; |
| 383 | } |
| 384 | |
Yinghai Lu | 0327318 | 2008-04-18 17:49:15 -0700 | [diff] [blame] | 385 | #ifdef CONFIG_MEMTEST |
Yinghai Lu | c64df70 | 2008-03-21 18:56:19 -0700 | [diff] [blame] | 386 | |
| 387 | static void __init memtest(unsigned long start_phys, unsigned long size, |
| 388 | unsigned pattern) |
Yinghai Lu | 272b9ca | 2008-03-20 23:58:33 -0700 | [diff] [blame] | 389 | { |
| 390 | unsigned long i; |
| 391 | unsigned long *start; |
| 392 | unsigned long start_bad; |
| 393 | unsigned long last_bad; |
| 394 | unsigned long val; |
| 395 | unsigned long start_phys_aligned; |
| 396 | unsigned long count; |
| 397 | unsigned long incr; |
| 398 | |
| 399 | switch (pattern) { |
| 400 | case 0: |
| 401 | val = 0UL; |
| 402 | break; |
| 403 | case 1: |
| 404 | val = -1UL; |
| 405 | break; |
| 406 | case 2: |
| 407 | val = 0x5555555555555555UL; |
| 408 | break; |
| 409 | case 3: |
| 410 | val = 0xaaaaaaaaaaaaaaaaUL; |
| 411 | break; |
| 412 | default: |
| 413 | return; |
| 414 | } |
| 415 | |
| 416 | incr = sizeof(unsigned long); |
| 417 | start_phys_aligned = ALIGN(start_phys, incr); |
| 418 | count = (size - (start_phys_aligned - start_phys))/incr; |
| 419 | start = __va(start_phys_aligned); |
| 420 | start_bad = 0; |
| 421 | last_bad = 0; |
| 422 | |
| 423 | for (i = 0; i < count; i++) |
| 424 | start[i] = val; |
| 425 | for (i = 0; i < count; i++, start++, start_phys_aligned += incr) { |
| 426 | if (*start != val) { |
| 427 | if (start_phys_aligned == last_bad + incr) { |
| 428 | last_bad += incr; |
| 429 | } else { |
| 430 | if (start_bad) { |
Yinghai Lu | dcfe946 | 2008-04-15 23:17:42 -0700 | [diff] [blame] | 431 | printk(KERN_CONT "\n %016lx bad mem addr %016lx - %016lx reserved", |
Yinghai Lu | 272b9ca | 2008-03-20 23:58:33 -0700 | [diff] [blame] | 432 | val, start_bad, last_bad + incr); |
| 433 | reserve_early(start_bad, last_bad - start_bad, "BAD RAM"); |
| 434 | } |
| 435 | start_bad = last_bad = start_phys_aligned; |
| 436 | } |
| 437 | } |
| 438 | } |
| 439 | if (start_bad) { |
Yinghai Lu | dcfe946 | 2008-04-15 23:17:42 -0700 | [diff] [blame] | 440 | printk(KERN_CONT "\n %016lx bad mem addr %016lx - %016lx reserved", |
Yinghai Lu | 272b9ca | 2008-03-20 23:58:33 -0700 | [diff] [blame] | 441 | val, start_bad, last_bad + incr); |
| 442 | reserve_early(start_bad, last_bad - start_bad, "BAD RAM"); |
| 443 | } |
| 444 | |
| 445 | } |
| 446 | |
Yinghai Lu | 0327318 | 2008-04-18 17:49:15 -0700 | [diff] [blame] | 447 | /* default is disabled */ |
| 448 | static int memtest_pattern __initdata; |
Yinghai Lu | c64df70 | 2008-03-21 18:56:19 -0700 | [diff] [blame] | 449 | |
Yinghai Lu | 272b9ca | 2008-03-20 23:58:33 -0700 | [diff] [blame] | 450 | static int __init parse_memtest(char *arg) |
| 451 | { |
| 452 | if (arg) |
Yinghai Lu | c64df70 | 2008-03-21 18:56:19 -0700 | [diff] [blame] | 453 | memtest_pattern = simple_strtoul(arg, NULL, 0); |
Yinghai Lu | 272b9ca | 2008-03-20 23:58:33 -0700 | [diff] [blame] | 454 | return 0; |
| 455 | } |
| 456 | |
| 457 | early_param("memtest", parse_memtest); |
| 458 | |
| 459 | static void __init early_memtest(unsigned long start, unsigned long end) |
| 460 | { |
Andrew Morton | 27df66a | 2008-07-03 10:14:10 +0200 | [diff] [blame] | 461 | u64 t_start, t_size; |
Yinghai Lu | 272b9ca | 2008-03-20 23:58:33 -0700 | [diff] [blame] | 462 | unsigned pattern; |
| 463 | |
Yinghai Lu | c64df70 | 2008-03-21 18:56:19 -0700 | [diff] [blame] | 464 | if (!memtest_pattern) |
| 465 | return; |
| 466 | |
| 467 | printk(KERN_INFO "early_memtest: pattern num %d", memtest_pattern); |
Yinghai Lu | 272b9ca | 2008-03-20 23:58:33 -0700 | [diff] [blame] | 468 | for (pattern = 0; pattern < memtest_pattern; pattern++) { |
| 469 | t_start = start; |
| 470 | t_size = 0; |
| 471 | while (t_start < end) { |
| 472 | t_start = find_e820_area_size(t_start, &t_size, 1); |
| 473 | |
| 474 | /* done ? */ |
| 475 | if (t_start >= end) |
| 476 | break; |
| 477 | if (t_start + t_size > end) |
| 478 | t_size = end - t_start; |
| 479 | |
Andrew Morton | 27df66a | 2008-07-03 10:14:10 +0200 | [diff] [blame] | 480 | printk(KERN_CONT "\n %016llx - %016llx pattern %d", |
| 481 | (unsigned long long)t_start, |
| 482 | (unsigned long long)t_start + t_size, pattern); |
Yinghai Lu | 272b9ca | 2008-03-20 23:58:33 -0700 | [diff] [blame] | 483 | |
| 484 | memtest(t_start, t_size, pattern); |
| 485 | |
| 486 | t_start += t_size; |
| 487 | } |
| 488 | } |
Yinghai Lu | c64df70 | 2008-03-21 18:56:19 -0700 | [diff] [blame] | 489 | printk(KERN_CONT "\n"); |
Yinghai Lu | 272b9ca | 2008-03-20 23:58:33 -0700 | [diff] [blame] | 490 | } |
Yinghai Lu | c64df70 | 2008-03-21 18:56:19 -0700 | [diff] [blame] | 491 | #else |
| 492 | static void __init early_memtest(unsigned long start, unsigned long end) |
| 493 | { |
| 494 | } |
| 495 | #endif |
Yinghai Lu | 272b9ca | 2008-03-20 23:58:33 -0700 | [diff] [blame] | 496 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 497 | /* |
| 498 | * Setup the direct mapping of the physical memory at PAGE_OFFSET. |
| 499 | * This runs before bootmem is initialized and gets pages directly from |
| 500 | * the physical memory. To access them they are temporarily mapped. |
| 501 | */ |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 502 | 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] | 503 | { |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 504 | unsigned long next, last_map_addr = end; |
Yinghai Lu | 272b9ca | 2008-03-20 23:58:33 -0700 | [diff] [blame] | 505 | unsigned long start_phys = start, end_phys = end; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | |
Yinghai Lu | 272b9ca | 2008-03-20 23:58:33 -0700 | [diff] [blame] | 507 | printk(KERN_INFO "init_memory_mapping\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 509 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | * Find space for the kernel direct mapping tables. |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 511 | * |
| 512 | * Later we should allocate these tables in the local node of the |
| 513 | * memory mapped. Unfortunately this is done currently before the |
| 514 | * nodes are discovered. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | */ |
Andi Kleen | ef92576 | 2008-04-17 17:40:45 +0200 | [diff] [blame] | 516 | if (!after_bootmem) { |
| 517 | init_gbpages(); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 518 | find_early_table_space(end); |
Andi Kleen | ef92576 | 2008-04-17 17:40:45 +0200 | [diff] [blame] | 519 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | |
| 521 | start = (unsigned long)__va(start); |
| 522 | end = (unsigned long)__va(end); |
| 523 | |
| 524 | for (; start < end; start = next) { |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 525 | pgd_t *pgd = pgd_offset_k(start); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 526 | unsigned long pud_phys; |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 527 | pud_t *pud; |
| 528 | |
| 529 | if (after_bootmem) |
Andi Kleen | d2ae5b5 | 2006-06-26 13:57:56 +0200 | [diff] [blame] | 530 | pud = pud_offset(pgd, start & PGDIR_MASK); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 531 | else |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 532 | pud = alloc_low_page(&pud_phys); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 533 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | next = start + PGDIR_SIZE; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 535 | if (next > end) |
| 536 | next = end; |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 537 | last_map_addr = phys_pud_init(pud, __pa(start), __pa(next)); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 538 | if (!after_bootmem) |
Jeremy Fitzhardinge | bb23e40 | 2008-06-25 00:19:02 -0400 | [diff] [blame] | 539 | pgd_populate(&init_mm, pgd_offset_k(start), |
| 540 | __va(pud_phys)); |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 541 | unmap_low_page(pud); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 542 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 544 | if (!after_bootmem) |
Glauber de Oliveira Costa | f51c945 | 2007-07-22 11:12:29 +0200 | [diff] [blame] | 545 | mmu_cr4_features = read_cr4(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | __flush_tlb_all(); |
Andi Kleen | 7517527 | 2008-01-30 13:33:17 +0100 | [diff] [blame] | 547 | |
Yinghai Lu | 24a5da7 | 2008-02-01 17:49:41 +0100 | [diff] [blame] | 548 | if (!after_bootmem) |
| 549 | reserve_early(table_start << PAGE_SHIFT, |
| 550 | table_end << PAGE_SHIFT, "PGTABLE"); |
Yinghai Lu | 272b9ca | 2008-03-20 23:58:33 -0700 | [diff] [blame] | 551 | |
| 552 | if (!after_bootmem) |
| 553 | early_memtest(start_phys, end_phys); |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 554 | |
Yinghai Lu | 1a0db38 | 2008-06-24 14:56:20 -0700 | [diff] [blame] | 555 | return last_map_addr >> PAGE_SHIFT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | } |
| 557 | |
Matt Tolentino | 2b97690 | 2005-06-23 00:08:06 -0700 | [diff] [blame] | 558 | #ifndef CONFIG_NUMA |
Yinghai Lu | 1f75d7e | 2008-06-22 02:44:49 -0700 | [diff] [blame] | 559 | void __init initmem_init(unsigned long start_pfn, unsigned long end_pfn) |
| 560 | { |
| 561 | unsigned long bootmap_size, bootmap; |
| 562 | |
| 563 | bootmap_size = bootmem_bootmap_pages(end_pfn)<<PAGE_SHIFT; |
| 564 | bootmap = find_e820_area(0, end_pfn<<PAGE_SHIFT, bootmap_size, |
| 565 | PAGE_SIZE); |
| 566 | if (bootmap == -1L) |
| 567 | panic("Cannot find bootmem map of size %ld\n", bootmap_size); |
Yinghai Lu | 346cafe | 2008-06-23 03:06:14 -0700 | [diff] [blame] | 568 | /* don't touch min_low_pfn */ |
| 569 | bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap >> PAGE_SHIFT, |
| 570 | 0, end_pfn); |
Yinghai Lu | 1f75d7e | 2008-06-22 02:44:49 -0700 | [diff] [blame] | 571 | e820_register_active_regions(0, start_pfn, end_pfn); |
| 572 | free_bootmem_with_active_regions(0, end_pfn); |
| 573 | early_res_to_bootmem(0, end_pfn<<PAGE_SHIFT); |
| 574 | reserve_bootmem(bootmap, bootmap_size, BOOTMEM_DEFAULT); |
| 575 | } |
| 576 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | void __init paging_init(void) |
| 578 | { |
Mel Gorman | 6391af1 | 2006-10-11 01:20:39 -0700 | [diff] [blame] | 579 | unsigned long max_zone_pfns[MAX_NR_ZONES]; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 580 | |
Mel Gorman | 6391af1 | 2006-10-11 01:20:39 -0700 | [diff] [blame] | 581 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); |
| 582 | max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN; |
| 583 | max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN; |
Yinghai Lu | c987d12 | 2008-06-24 22:14:09 -0700 | [diff] [blame] | 584 | max_zone_pfns[ZONE_NORMAL] = max_pfn; |
Mel Gorman | 6391af1 | 2006-10-11 01:20:39 -0700 | [diff] [blame] | 585 | |
Yinghai Lu | c987d12 | 2008-06-24 22:14:09 -0700 | [diff] [blame] | 586 | memory_present(0, 0, max_pfn); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 587 | sparse_init(); |
Mel Gorman | 5cb248a | 2006-09-27 01:49:52 -0700 | [diff] [blame] | 588 | free_area_init_nodes(max_zone_pfns); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | } |
| 590 | #endif |
| 591 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 592 | /* |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 593 | * Memory hotplug specific functions |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 594 | */ |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 595 | #ifdef CONFIG_MEMORY_HOTPLUG |
| 596 | /* |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 597 | * Memory is added always to NORMAL zone. This means you will never get |
| 598 | * additional DMA/DMA32 memory. |
| 599 | */ |
| 600 | int arch_add_memory(int nid, u64 start, u64 size) |
| 601 | { |
| 602 | struct pglist_data *pgdat = NODE_DATA(nid); |
Christoph Lameter | 776ed98 | 2006-09-25 23:31:09 -0700 | [diff] [blame] | 603 | struct zone *zone = pgdat->node_zones + ZONE_NORMAL; |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 604 | unsigned long last_mapped_pfn, start_pfn = start >> PAGE_SHIFT; |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 605 | unsigned long nr_pages = size >> PAGE_SHIFT; |
| 606 | int ret; |
| 607 | |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 608 | last_mapped_pfn = init_memory_mapping(start, start + size-1); |
| 609 | if (last_mapped_pfn > max_pfn_mapped) |
| 610 | max_pfn_mapped = last_mapped_pfn; |
Keith Mannthey | 45e0b78 | 2006-09-30 23:27:09 -0700 | [diff] [blame] | 611 | |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 612 | ret = __add_pages(zone, start_pfn, nr_pages); |
Ingo Molnar | 10f22dd | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 613 | WARN_ON(1); |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 614 | |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 615 | return ret; |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 616 | } |
| 617 | EXPORT_SYMBOL_GPL(arch_add_memory); |
| 618 | |
Yasunori Goto | 8243229 | 2006-11-18 22:19:40 -0800 | [diff] [blame] | 619 | #if !defined(CONFIG_ACPI_NUMA) && defined(CONFIG_NUMA) |
Keith Mannthey | 4942e99 | 2006-09-30 23:27:06 -0700 | [diff] [blame] | 620 | int memory_add_physaddr_to_nid(u64 start) |
| 621 | { |
| 622 | return 0; |
| 623 | } |
Keith Mannthey | 8c2676a | 2006-09-30 23:27:07 -0700 | [diff] [blame] | 624 | EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid); |
Keith Mannthey | 4942e99 | 2006-09-30 23:27:06 -0700 | [diff] [blame] | 625 | #endif |
| 626 | |
Keith Mannthey | 45e0b78 | 2006-09-30 23:27:09 -0700 | [diff] [blame] | 627 | #endif /* CONFIG_MEMORY_HOTPLUG */ |
| 628 | |
Arjan van de Ven | ae531c2 | 2008-04-24 23:40:47 +0200 | [diff] [blame] | 629 | /* |
| 630 | * devmem_is_allowed() checks to see if /dev/mem access to a certain address |
| 631 | * is valid. The argument is a physical page number. |
| 632 | * |
| 633 | * |
| 634 | * On x86, access has to be given to the first megabyte of ram because that area |
| 635 | * contains bios code and data regions used by X and dosemu and similar apps. |
| 636 | * Access has to be given to non-kernel-ram areas as well, these contain the PCI |
| 637 | * mmio resources as well as potential bios/acpi data regions. |
| 638 | */ |
| 639 | int devmem_is_allowed(unsigned long pagenr) |
| 640 | { |
| 641 | if (pagenr <= 256) |
| 642 | return 1; |
| 643 | if (!page_is_ram(pagenr)) |
| 644 | return 1; |
| 645 | return 0; |
| 646 | } |
| 647 | |
| 648 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 649 | static struct kcore_list kcore_mem, kcore_vmalloc, kcore_kernel, |
| 650 | kcore_modules, kcore_vsyscall; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | |
| 652 | void __init mem_init(void) |
| 653 | { |
Andi Kleen | 0a43e4b | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 654 | long codesize, reservedpages, datasize, initsize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | |
Jon Mason | 0dc243a | 2006-06-26 13:58:11 +0200 | [diff] [blame] | 656 | pci_iommu_alloc(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | |
Yinghai Lu | 48ddb15 | 2008-01-30 13:32:36 +0100 | [diff] [blame] | 658 | /* clear_bss() already clear the empty_zero_page */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | |
| 660 | reservedpages = 0; |
| 661 | |
| 662 | /* this will put all low memory onto the freelists */ |
Matt Tolentino | 2b97690 | 2005-06-23 00:08:06 -0700 | [diff] [blame] | 663 | #ifdef CONFIG_NUMA |
Andi Kleen | 0a43e4b | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 664 | totalram_pages = numa_free_all_bootmem(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | #else |
Andi Kleen | 0a43e4b | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 666 | totalram_pages = free_all_bootmem(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | #endif |
Yinghai Lu | c987d12 | 2008-06-24 22:14:09 -0700 | [diff] [blame] | 668 | reservedpages = max_pfn - totalram_pages - |
| 669 | absent_pages_in_range(0, max_pfn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | after_bootmem = 1; |
| 671 | |
| 672 | codesize = (unsigned long) &_etext - (unsigned long) &_text; |
| 673 | datasize = (unsigned long) &_edata - (unsigned long) &_etext; |
| 674 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; |
| 675 | |
| 676 | /* Register memory areas for /proc/kcore */ |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 677 | kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT); |
| 678 | kclist_add(&kcore_vmalloc, (void *)VMALLOC_START, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | VMALLOC_END-VMALLOC_START); |
| 680 | kclist_add(&kcore_kernel, &_stext, _end - _stext); |
| 681 | kclist_add(&kcore_modules, (void *)MODULES_VADDR, MODULES_LEN); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 682 | kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | VSYSCALL_END - VSYSCALL_START); |
| 684 | |
Ingo Molnar | 10f22dd | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 685 | printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, " |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 686 | "%ldk reserved, %ldk data, %ldk init)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), |
Yinghai Lu | c987d12 | 2008-06-24 22:14:09 -0700 | [diff] [blame] | 688 | max_pfn << (PAGE_SHIFT-10), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | codesize >> 10, |
| 690 | reservedpages << (PAGE_SHIFT-10), |
| 691 | datasize >> 10, |
| 692 | initsize >> 10); |
Thomas Gleixner | 76ebd05 | 2008-02-09 23:24:09 +0100 | [diff] [blame] | 693 | |
| 694 | cpa_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | } |
| 696 | |
Gerd Hoffmann | d167a51 | 2006-06-26 13:56:16 +0200 | [diff] [blame] | 697 | void free_init_pages(char *what, unsigned long begin, unsigned long end) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | { |
Thomas Gleixner | bfc734b | 2008-02-09 23:24:09 +0100 | [diff] [blame] | 699 | unsigned long addr = begin; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | |
Thomas Gleixner | bfc734b | 2008-02-09 23:24:09 +0100 | [diff] [blame] | 701 | if (addr >= end) |
Gerd Hoffmann | d167a51 | 2006-06-26 13:56:16 +0200 | [diff] [blame] | 702 | return; |
| 703 | |
Ingo Molnar | ee01f11 | 2008-01-30 13:34:09 +0100 | [diff] [blame] | 704 | /* |
| 705 | * If debugging page accesses then do not free this memory but |
| 706 | * mark them not present - any buggy init-section access will |
| 707 | * create a kernel page fault: |
| 708 | */ |
| 709 | #ifdef CONFIG_DEBUG_PAGEALLOC |
| 710 | printk(KERN_INFO "debug: unmapping init memory %08lx..%08lx\n", |
| 711 | begin, PAGE_ALIGN(end)); |
| 712 | set_memory_np(begin, (end - begin) >> PAGE_SHIFT); |
| 713 | #else |
Jan Beulich | 6fb1475 | 2007-05-02 19:27:10 +0200 | [diff] [blame] | 714 | printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 715 | |
Thomas Gleixner | bfc734b | 2008-02-09 23:24:09 +0100 | [diff] [blame] | 716 | for (; addr < end; addr += PAGE_SIZE) { |
Linus Torvalds | e3ebadd | 2007-05-07 08:44:24 -0700 | [diff] [blame] | 717 | ClearPageReserved(virt_to_page(addr)); |
| 718 | init_page_count(virt_to_page(addr)); |
| 719 | memset((void *)(addr & ~(PAGE_SIZE-1)), |
| 720 | POISON_FREE_INITMEM, PAGE_SIZE); |
Linus Torvalds | e3ebadd | 2007-05-07 08:44:24 -0700 | [diff] [blame] | 721 | free_page(addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | totalram_pages++; |
| 723 | } |
Ingo Molnar | ee01f11 | 2008-01-30 13:34:09 +0100 | [diff] [blame] | 724 | #endif |
Gerd Hoffmann | d167a51 | 2006-06-26 13:56:16 +0200 | [diff] [blame] | 725 | } |
| 726 | |
| 727 | void free_initmem(void) |
| 728 | { |
Gerd Hoffmann | d167a51 | 2006-06-26 13:56:16 +0200 | [diff] [blame] | 729 | free_init_pages("unused kernel memory", |
Linus Torvalds | e3ebadd | 2007-05-07 08:44:24 -0700 | [diff] [blame] | 730 | (unsigned long)(&__init_begin), |
| 731 | (unsigned long)(&__init_end)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | } |
| 733 | |
Arjan van de Ven | 67df197 | 2006-01-06 00:12:04 -0800 | [diff] [blame] | 734 | #ifdef CONFIG_DEBUG_RODATA |
Arjan van de Ven | edeed30 | 2008-01-30 13:34:08 +0100 | [diff] [blame] | 735 | const int rodata_test_data = 0xC3; |
| 736 | EXPORT_SYMBOL_GPL(rodata_test_data); |
Arjan van de Ven | 67df197 | 2006-01-06 00:12:04 -0800 | [diff] [blame] | 737 | |
Arjan van de Ven | 67df197 | 2006-01-06 00:12:04 -0800 | [diff] [blame] | 738 | void mark_rodata_ro(void) |
| 739 | { |
Mathieu Desnoyers | 4e4eee0 | 2008-02-02 15:42:20 -0500 | [diff] [blame] | 740 | 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] | 741 | |
Jan Beulich | 6fb1475 | 2007-05-02 19:27:10 +0200 | [diff] [blame] | 742 | printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n", |
Linus Torvalds | e3ebadd | 2007-05-07 08:44:24 -0700 | [diff] [blame] | 743 | (end - start) >> 10); |
Arjan van de Ven | 984bb80 | 2008-02-06 22:39:45 +0100 | [diff] [blame] | 744 | set_memory_ro(start, (end - start) >> PAGE_SHIFT); |
| 745 | |
| 746 | /* |
| 747 | * The rodata section (but not the kernel text!) should also be |
| 748 | * not-executable. |
| 749 | */ |
| 750 | start = ((unsigned long)__start_rodata + PAGE_SIZE - 1) & PAGE_MASK; |
| 751 | set_memory_nx(start, (end - start) >> PAGE_SHIFT); |
Arjan van de Ven | 67df197 | 2006-01-06 00:12:04 -0800 | [diff] [blame] | 752 | |
Arjan van de Ven | 1a48725 | 2008-01-30 13:34:09 +0100 | [diff] [blame] | 753 | rodata_test(); |
| 754 | |
Andi Kleen | 0c42f39 | 2008-01-30 13:33:42 +0100 | [diff] [blame] | 755 | #ifdef CONFIG_CPA_DEBUG |
Ingo Molnar | 10f22dd | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 756 | 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] | 757 | set_memory_rw(start, (end-start) >> PAGE_SHIFT); |
Andi Kleen | 0c42f39 | 2008-01-30 13:33:42 +0100 | [diff] [blame] | 758 | |
Ingo Molnar | 10f22dd | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 759 | printk(KERN_INFO "Testing CPA: again\n"); |
Arjan van de Ven | 6d238cc | 2008-01-30 13:34:06 +0100 | [diff] [blame] | 760 | set_memory_ro(start, (end-start) >> PAGE_SHIFT); |
Andi Kleen | 0c42f39 | 2008-01-30 13:33:42 +0100 | [diff] [blame] | 761 | #endif |
Arjan van de Ven | 67df197 | 2006-01-06 00:12:04 -0800 | [diff] [blame] | 762 | } |
Mathieu Desnoyers | 4e4eee0 | 2008-02-02 15:42:20 -0500 | [diff] [blame] | 763 | |
Arjan van de Ven | 67df197 | 2006-01-06 00:12:04 -0800 | [diff] [blame] | 764 | #endif |
| 765 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | #ifdef CONFIG_BLK_DEV_INITRD |
| 767 | void free_initrd_mem(unsigned long start, unsigned long end) |
| 768 | { |
Linus Torvalds | e3ebadd | 2007-05-07 08:44:24 -0700 | [diff] [blame] | 769 | free_init_pages("initrd memory", start, end); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | } |
| 771 | #endif |
| 772 | |
Yinghai Lu | d2dbf34 | 2008-06-13 02:00:56 -0700 | [diff] [blame] | 773 | int __init reserve_bootmem_generic(unsigned long phys, unsigned long len, |
| 774 | int flags) |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 775 | { |
Matt Tolentino | 2b97690 | 2005-06-23 00:08:06 -0700 | [diff] [blame] | 776 | #ifdef CONFIG_NUMA |
Yinghai Lu | 8b3cd09e | 2008-03-18 12:50:21 -0700 | [diff] [blame] | 777 | int nid, next_nid; |
Yinghai Lu | 6a07a0e | 2008-06-23 14:02:36 -0700 | [diff] [blame] | 778 | int ret; |
Andi Kleen | 5e58a02 | 2006-11-14 16:57:46 +0100 | [diff] [blame] | 779 | #endif |
| 780 | unsigned long pfn = phys >> PAGE_SHIFT; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 781 | |
Yinghai Lu | c987d12 | 2008-06-24 22:14:09 -0700 | [diff] [blame] | 782 | if (pfn >= max_pfn) { |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 783 | /* |
| 784 | * This can happen with kdump kernels when accessing |
| 785 | * firmware tables: |
| 786 | */ |
Thomas Gleixner | 6779429 | 2008-03-21 21:27:10 +0100 | [diff] [blame] | 787 | if (pfn < max_pfn_mapped) |
Bernhard Walle | 8b2ef1d | 2008-06-08 15:46:30 +0200 | [diff] [blame] | 788 | return -EFAULT; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 789 | |
Yinghai Lu | 6a07a0e | 2008-06-23 14:02:36 -0700 | [diff] [blame] | 790 | printk(KERN_ERR "reserve_bootmem: illegal reserve %lx %lu\n", |
Andi Kleen | 5e58a02 | 2006-11-14 16:57:46 +0100 | [diff] [blame] | 791 | phys, len); |
Bernhard Walle | 8b2ef1d | 2008-06-08 15:46:30 +0200 | [diff] [blame] | 792 | return -EFAULT; |
Andi Kleen | 5e58a02 | 2006-11-14 16:57:46 +0100 | [diff] [blame] | 793 | } |
| 794 | |
| 795 | /* Should check here against the e820 map to avoid double free */ |
| 796 | #ifdef CONFIG_NUMA |
Yinghai Lu | 8b3cd09e | 2008-03-18 12:50:21 -0700 | [diff] [blame] | 797 | nid = phys_to_nid(phys); |
| 798 | next_nid = phys_to_nid(phys + len - 1); |
| 799 | if (nid == next_nid) |
Bernhard Walle | 8b2ef1d | 2008-06-08 15:46:30 +0200 | [diff] [blame] | 800 | ret = reserve_bootmem_node(NODE_DATA(nid), phys, len, flags); |
Yinghai Lu | 8b3cd09e | 2008-03-18 12:50:21 -0700 | [diff] [blame] | 801 | else |
Bernhard Walle | 8b2ef1d | 2008-06-08 15:46:30 +0200 | [diff] [blame] | 802 | ret = reserve_bootmem(phys, len, flags); |
| 803 | |
| 804 | if (ret != 0) |
| 805 | return ret; |
| 806 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 807 | #else |
Bernhard Walle | 72a7fe3 | 2008-02-07 00:15:17 -0800 | [diff] [blame] | 808 | reserve_bootmem(phys, len, BOOTMEM_DEFAULT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | #endif |
Yinghai Lu | 8b3cd09e | 2008-03-18 12:50:21 -0700 | [diff] [blame] | 810 | |
Mel Gorman | 0e0b864 | 2006-09-27 01:49:56 -0700 | [diff] [blame] | 811 | if (phys+len <= MAX_DMA_PFN*PAGE_SIZE) { |
Andi Kleen | e18c687 | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 812 | dma_reserve += len / PAGE_SIZE; |
Mel Gorman | 0e0b864 | 2006-09-27 01:49:56 -0700 | [diff] [blame] | 813 | set_dma_reserve(dma_reserve); |
| 814 | } |
Bernhard Walle | 8b2ef1d | 2008-06-08 15:46:30 +0200 | [diff] [blame] | 815 | |
| 816 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 817 | } |
| 818 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 819 | int kern_addr_valid(unsigned long addr) |
| 820 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 822 | pgd_t *pgd; |
| 823 | pud_t *pud; |
| 824 | pmd_t *pmd; |
| 825 | pte_t *pte; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 826 | |
| 827 | if (above != 0 && above != -1UL) |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 828 | return 0; |
| 829 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | pgd = pgd_offset_k(addr); |
| 831 | if (pgd_none(*pgd)) |
| 832 | return 0; |
| 833 | |
| 834 | pud = pud_offset(pgd, addr); |
| 835 | if (pud_none(*pud)) |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 836 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | |
| 838 | pmd = pmd_offset(pud, addr); |
| 839 | if (pmd_none(*pmd)) |
| 840 | return 0; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 841 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | if (pmd_large(*pmd)) |
| 843 | return pfn_valid(pmd_pfn(*pmd)); |
| 844 | |
| 845 | pte = pte_offset_kernel(pmd, addr); |
| 846 | if (pte_none(*pte)) |
| 847 | return 0; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 848 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | return pfn_valid(pte_pfn(*pte)); |
| 850 | } |
| 851 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 852 | /* |
| 853 | * A pseudo VMA to allow ptrace access for the vsyscall page. This only |
| 854 | * covers the 64bit vsyscall page now. 32bit has a real VMA now and does |
| 855 | * not need special handling anymore: |
| 856 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 857 | static struct vm_area_struct gate_vma = { |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 858 | .vm_start = VSYSCALL_START, |
| 859 | .vm_end = VSYSCALL_START + (VSYSCALL_MAPPED_PAGES * PAGE_SIZE), |
| 860 | .vm_page_prot = PAGE_READONLY_EXEC, |
| 861 | .vm_flags = VM_READ | VM_EXEC |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | }; |
| 863 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | struct vm_area_struct *get_gate_vma(struct task_struct *tsk) |
| 865 | { |
| 866 | #ifdef CONFIG_IA32_EMULATION |
Andi Kleen | 1e01441 | 2005-04-16 15:24:55 -0700 | [diff] [blame] | 867 | if (test_tsk_thread_flag(tsk, TIF_IA32)) |
| 868 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | #endif |
| 870 | return &gate_vma; |
| 871 | } |
| 872 | |
| 873 | int in_gate_area(struct task_struct *task, unsigned long addr) |
| 874 | { |
| 875 | struct vm_area_struct *vma = get_gate_vma(task); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 876 | |
Andi Kleen | 1e01441 | 2005-04-16 15:24:55 -0700 | [diff] [blame] | 877 | if (!vma) |
| 878 | return 0; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 879 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | return (addr >= vma->vm_start) && (addr < vma->vm_end); |
| 881 | } |
| 882 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 883 | /* |
| 884 | * Use this when you have no reliable task/vma, typically from interrupt |
| 885 | * context. It is less reliable than using the task's vma and may give |
| 886 | * false positives: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | */ |
| 888 | int in_gate_area_no_task(unsigned long addr) |
| 889 | { |
Andi Kleen | 1e01441 | 2005-04-16 15:24:55 -0700 | [diff] [blame] | 890 | return (addr >= VSYSCALL_START) && (addr < VSYSCALL_END); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | } |
Zou Nan hai | 2e1c49d | 2007-06-01 00:46:28 -0700 | [diff] [blame] | 892 | |
Andi Kleen | 2aae950 | 2007-07-21 17:10:01 +0200 | [diff] [blame] | 893 | const char *arch_vma_name(struct vm_area_struct *vma) |
| 894 | { |
| 895 | if (vma->vm_mm && vma->vm_start == (long)vma->vm_mm->context.vdso) |
| 896 | return "[vdso]"; |
| 897 | if (vma == &gate_vma) |
| 898 | return "[vsyscall]"; |
| 899 | return NULL; |
| 900 | } |
Christoph Lameter | 0889eba | 2007-10-16 01:24:15 -0700 | [diff] [blame] | 901 | |
| 902 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
| 903 | /* |
| 904 | * Initialise the sparsemem vmemmap using huge-pages at the PMD level. |
| 905 | */ |
Yinghai Lu | c2b91e2 | 2008-04-12 01:19:24 -0700 | [diff] [blame] | 906 | static long __meminitdata addr_start, addr_end; |
| 907 | static void __meminitdata *p_start, *p_end; |
| 908 | static int __meminitdata node_start; |
| 909 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 910 | int __meminit |
| 911 | vmemmap_populate(struct page *start_page, unsigned long size, int node) |
Christoph Lameter | 0889eba | 2007-10-16 01:24:15 -0700 | [diff] [blame] | 912 | { |
| 913 | unsigned long addr = (unsigned long)start_page; |
| 914 | unsigned long end = (unsigned long)(start_page + size); |
| 915 | unsigned long next; |
| 916 | pgd_t *pgd; |
| 917 | pud_t *pud; |
| 918 | pmd_t *pmd; |
| 919 | |
| 920 | for (; addr < end; addr = next) { |
| 921 | next = pmd_addr_end(addr, end); |
| 922 | |
| 923 | pgd = vmemmap_pgd_populate(addr, node); |
| 924 | if (!pgd) |
| 925 | return -ENOMEM; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 926 | |
Christoph Lameter | 0889eba | 2007-10-16 01:24:15 -0700 | [diff] [blame] | 927 | pud = vmemmap_pud_populate(pgd, addr, node); |
| 928 | if (!pud) |
| 929 | return -ENOMEM; |
| 930 | |
| 931 | pmd = pmd_offset(pud, addr); |
| 932 | if (pmd_none(*pmd)) { |
| 933 | pte_t entry; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 934 | void *p; |
| 935 | |
| 936 | p = vmemmap_alloc_block(PMD_SIZE, node); |
Christoph Lameter | 0889eba | 2007-10-16 01:24:15 -0700 | [diff] [blame] | 937 | if (!p) |
| 938 | return -ENOMEM; |
| 939 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 940 | entry = pfn_pte(__pa(p) >> PAGE_SHIFT, |
| 941 | PAGE_KERNEL_LARGE); |
Christoph Lameter | 0889eba | 2007-10-16 01:24:15 -0700 | [diff] [blame] | 942 | set_pmd(pmd, __pmd(pte_val(entry))); |
| 943 | |
Yinghai Lu | c2b91e2 | 2008-04-12 01:19:24 -0700 | [diff] [blame] | 944 | /* check to see if we have contiguous blocks */ |
| 945 | if (p_end != p || node_start != node) { |
| 946 | if (p_start) |
| 947 | printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n", |
| 948 | addr_start, addr_end-1, p_start, p_end-1, node_start); |
| 949 | addr_start = addr; |
| 950 | node_start = node; |
| 951 | p_start = p; |
| 952 | } |
| 953 | addr_end = addr + PMD_SIZE; |
| 954 | p_end = p + PMD_SIZE; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 955 | } else { |
Christoph Lameter | 0889eba | 2007-10-16 01:24:15 -0700 | [diff] [blame] | 956 | vmemmap_verify((pte_t *)pmd, node, addr, next); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 957 | } |
Christoph Lameter | 0889eba | 2007-10-16 01:24:15 -0700 | [diff] [blame] | 958 | } |
Christoph Lameter | 0889eba | 2007-10-16 01:24:15 -0700 | [diff] [blame] | 959 | return 0; |
| 960 | } |
Yinghai Lu | c2b91e2 | 2008-04-12 01:19:24 -0700 | [diff] [blame] | 961 | |
| 962 | void __meminit vmemmap_populate_print_last(void) |
| 963 | { |
| 964 | if (p_start) { |
| 965 | printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n", |
| 966 | addr_start, addr_end-1, p_start, p_end-1, node_start); |
| 967 | p_start = NULL; |
| 968 | p_end = NULL; |
| 969 | node_start = 0; |
| 970 | } |
| 971 | } |
Christoph Lameter | 0889eba | 2007-10-16 01:24:15 -0700 | [diff] [blame] | 972 | #endif |