Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/x86_64/mm/init.c |
| 3 | * |
| 4 | * Copyright (C) 1995 Linus Torvalds |
| 5 | * Copyright (C) 2000 Pavel Machek <pavel@suse.cz> |
| 6 | * Copyright (C) 2002,2003 Andi Kleen <ak@suse.de> |
| 7 | */ |
| 8 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | #include <linux/signal.h> |
| 10 | #include <linux/sched.h> |
| 11 | #include <linux/kernel.h> |
| 12 | #include <linux/errno.h> |
| 13 | #include <linux/string.h> |
| 14 | #include <linux/types.h> |
| 15 | #include <linux/ptrace.h> |
| 16 | #include <linux/mman.h> |
| 17 | #include <linux/mm.h> |
| 18 | #include <linux/swap.h> |
| 19 | #include <linux/smp.h> |
| 20 | #include <linux/init.h> |
| 21 | #include <linux/pagemap.h> |
| 22 | #include <linux/bootmem.h> |
| 23 | #include <linux/proc_fs.h> |
Andi Kleen | 5917089 | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 24 | #include <linux/pci.h> |
Jan Beulich | 6fb1475 | 2007-05-02 19:27:10 +0200 | [diff] [blame] | 25 | #include <linux/pfn.h> |
Randy Dunlap | c9cf552 | 2006-06-27 02:53:52 -0700 | [diff] [blame] | 26 | #include <linux/poison.h> |
Muli Ben-Yehuda | 17a941d | 2006-01-11 22:44:42 +0100 | [diff] [blame] | 27 | #include <linux/dma-mapping.h> |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 28 | #include <linux/module.h> |
| 29 | #include <linux/memory_hotplug.h> |
Konrad Rzeszutek | ae32b12 | 2007-05-02 19:27:11 +0200 | [diff] [blame] | 30 | #include <linux/nmi.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | |
| 32 | #include <asm/processor.h> |
| 33 | #include <asm/system.h> |
| 34 | #include <asm/uaccess.h> |
| 35 | #include <asm/pgtable.h> |
| 36 | #include <asm/pgalloc.h> |
| 37 | #include <asm/dma.h> |
| 38 | #include <asm/fixmap.h> |
| 39 | #include <asm/e820.h> |
| 40 | #include <asm/apic.h> |
| 41 | #include <asm/tlb.h> |
| 42 | #include <asm/mmu_context.h> |
| 43 | #include <asm/proto.h> |
| 44 | #include <asm/smp.h> |
Andi Kleen | 2bc0414 | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 45 | #include <asm/sections.h> |
Thomas Gleixner | 718fc13 | 2008-01-30 13:30:17 +0100 | [diff] [blame] | 46 | #include <asm/kdebug.h> |
Thomas Gleixner | aaa64e0 | 2008-01-30 13:30:17 +0100 | [diff] [blame] | 47 | #include <asm/numa.h> |
Harvey Harrison | 7bfeab9 | 2008-02-12 12:12:01 -0800 | [diff] [blame] | 48 | #include <asm/cacheflush.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | |
Andi Kleen | e18c687 | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 50 | static unsigned long dma_reserve __initdata; |
| 51 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); |
| 53 | |
Ingo Molnar | 00d1c5e | 2008-04-17 17:40:45 +0200 | [diff] [blame] | 54 | int direct_gbpages __meminitdata |
| 55 | #ifdef CONFIG_DIRECT_GBPAGES |
| 56 | = 1 |
| 57 | #endif |
| 58 | ; |
| 59 | |
| 60 | static int __init parse_direct_gbpages_off(char *arg) |
| 61 | { |
| 62 | direct_gbpages = 0; |
| 63 | return 0; |
| 64 | } |
| 65 | early_param("nogbpages", parse_direct_gbpages_off); |
| 66 | |
| 67 | static int __init parse_direct_gbpages_on(char *arg) |
| 68 | { |
| 69 | direct_gbpages = 1; |
| 70 | return 0; |
| 71 | } |
| 72 | early_param("gbpages", parse_direct_gbpages_on); |
| 73 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | /* |
| 75 | * NOTE: pagetable_init alloc all the fixmap pagetables contiguous on the |
| 76 | * physical space so we can cache the place of the first one and move |
| 77 | * around without checking the pgd every time. |
| 78 | */ |
| 79 | |
| 80 | void show_mem(void) |
| 81 | { |
Andi Kleen | e92343c | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 82 | long i, total = 0, reserved = 0; |
| 83 | long shared = 0, cached = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | struct page *page; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 85 | pg_data_t *pgdat; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | |
Andi Kleen | e92343c | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 87 | printk(KERN_INFO "Mem-info:\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | show_free_areas(); |
KAMEZAWA Hiroyuki | ec936fc | 2006-03-27 01:15:59 -0800 | [diff] [blame] | 89 | for_each_online_pgdat(pgdat) { |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 90 | for (i = 0; i < pgdat->node_spanned_pages; ++i) { |
| 91 | /* |
| 92 | * This loop can take a while with 256 GB and |
| 93 | * 4k pages so defer the NMI watchdog: |
| 94 | */ |
| 95 | if (unlikely(i % MAX_ORDER_NR_PAGES == 0)) |
Konrad Rzeszutek | ae32b12 | 2007-05-02 19:27:11 +0200 | [diff] [blame] | 96 | touch_nmi_watchdog(); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 97 | |
Bob Picco | 12710a5 | 2007-06-08 13:47:00 -0700 | [diff] [blame] | 98 | if (!pfn_valid(pgdat->node_start_pfn + i)) |
| 99 | continue; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 100 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | page = pfn_to_page(pgdat->node_start_pfn + i); |
| 102 | total++; |
Andi Kleen | e92343c | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 103 | if (PageReserved(page)) |
| 104 | reserved++; |
| 105 | else if (PageSwapCache(page)) |
| 106 | cached++; |
| 107 | else if (page_count(page)) |
| 108 | shared += page_count(page) - 1; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 109 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | } |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 111 | printk(KERN_INFO "%lu pages of RAM\n", total); |
| 112 | printk(KERN_INFO "%lu reserved pages\n", reserved); |
| 113 | printk(KERN_INFO "%lu pages shared\n", shared); |
| 114 | printk(KERN_INFO "%lu pages swap cached\n", cached); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | } |
| 116 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | int after_bootmem; |
| 118 | |
Andi Kleen | 5f44a66 | 2006-03-25 16:30:25 +0100 | [diff] [blame] | 119 | static __init void *spp_getpage(void) |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 120 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | void *ptr; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 122 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | if (after_bootmem) |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 124 | ptr = (void *) get_zeroed_page(GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | else |
| 126 | ptr = alloc_bootmem_pages(PAGE_SIZE); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 127 | |
| 128 | if (!ptr || ((unsigned long)ptr & ~PAGE_MASK)) { |
| 129 | panic("set_pte_phys: cannot allocate page data %s\n", |
| 130 | after_bootmem ? "after bootmem" : ""); |
| 131 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | |
Ingo Molnar | 10f22dd | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 133 | pr_debug("spp_getpage %p\n", ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 135 | return ptr; |
| 136 | } |
| 137 | |
Ingo Molnar | 82a355f | 2008-04-25 18:28:21 +0200 | [diff] [blame] | 138 | static void |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 139 | set_pte_phys(unsigned long vaddr, unsigned long phys, pgprot_t prot) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | { |
| 141 | pgd_t *pgd; |
| 142 | pud_t *pud; |
| 143 | pmd_t *pmd; |
| 144 | pte_t *pte, new_pte; |
| 145 | |
Ingo Molnar | 10f22dd | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 146 | pr_debug("set_pte_phys %lx to %lx\n", vaddr, phys); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | |
| 148 | pgd = pgd_offset_k(vaddr); |
| 149 | if (pgd_none(*pgd)) { |
Ingo Molnar | 10f22dd | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 150 | printk(KERN_ERR |
| 151 | "PGD FIXMAP MISSING, it should be setup in head.S!\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | return; |
| 153 | } |
| 154 | pud = pud_offset(pgd, vaddr); |
| 155 | if (pud_none(*pud)) { |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 156 | pmd = (pmd_t *) spp_getpage(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE | _PAGE_USER)); |
| 158 | if (pmd != pmd_offset(pud, 0)) { |
Ingo Molnar | 10f22dd | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 159 | printk(KERN_ERR "PAGETABLE BUG #01! %p <-> %p\n", |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 160 | pmd, pmd_offset(pud, 0)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | return; |
| 162 | } |
| 163 | } |
| 164 | pmd = pmd_offset(pud, vaddr); |
| 165 | if (pmd_none(*pmd)) { |
| 166 | pte = (pte_t *) spp_getpage(); |
| 167 | set_pmd(pmd, __pmd(__pa(pte) | _KERNPG_TABLE | _PAGE_USER)); |
| 168 | if (pte != pte_offset_kernel(pmd, 0)) { |
Ingo Molnar | 10f22dd | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 169 | printk(KERN_ERR "PAGETABLE BUG #02!\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | return; |
| 171 | } |
| 172 | } |
| 173 | new_pte = pfn_pte(phys >> PAGE_SHIFT, prot); |
| 174 | |
| 175 | pte = pte_offset_kernel(pmd, vaddr); |
Ingo Molnar | 70c9f59 | 2008-04-25 18:05:57 +0200 | [diff] [blame] | 176 | if (!pte_none(*pte) && pte_val(new_pte) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | pte_val(*pte) != (pte_val(new_pte) & __supported_pte_mask)) |
| 178 | pte_ERROR(*pte); |
| 179 | set_pte(pte, new_pte); |
| 180 | |
| 181 | /* |
| 182 | * It's enough to flush this one mapping. |
| 183 | * (PGE mappings get flushed as well) |
| 184 | */ |
| 185 | __flush_tlb_one(vaddr); |
| 186 | } |
| 187 | |
Thomas Gleixner | 31eedd8 | 2008-02-15 17:29:12 +0100 | [diff] [blame] | 188 | /* |
Ingo Molnar | 88f3aec | 2008-02-21 11:04:11 +0100 | [diff] [blame] | 189 | * The head.S code sets up the kernel high mapping: |
| 190 | * |
| 191 | * from __START_KERNEL_map to __START_KERNEL_map + size (== _end-_text) |
Thomas Gleixner | 31eedd8 | 2008-02-15 17:29:12 +0100 | [diff] [blame] | 192 | * |
| 193 | * phys_addr holds the negative offset to the kernel, which is added |
| 194 | * to the compile time generated pmds. This results in invalid pmds up |
| 195 | * to the point where we hit the physaddr 0 mapping. |
| 196 | * |
| 197 | * We limit the mappings to the region from _text to _end. _end is |
| 198 | * rounded up to the 2MB boundary. This catches the invalid pmds as |
| 199 | * well, as they are located before _text: |
| 200 | */ |
| 201 | void __init cleanup_highmap(void) |
| 202 | { |
| 203 | unsigned long vaddr = __START_KERNEL_map; |
| 204 | unsigned long end = round_up((unsigned long)_end, PMD_SIZE) - 1; |
| 205 | pmd_t *pmd = level2_kernel_pgt; |
| 206 | pmd_t *last_pmd = pmd + PTRS_PER_PMD; |
| 207 | |
| 208 | for (; pmd < last_pmd; pmd++, vaddr += PMD_SIZE) { |
| 209 | if (!pmd_present(*pmd)) |
| 210 | continue; |
| 211 | if (vaddr < (unsigned long) _text || vaddr > end) |
| 212 | set_pmd(pmd, __pmd(0)); |
| 213 | } |
| 214 | } |
| 215 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | /* NOTE: this is meant to be run only at boot */ |
Ingo Molnar | 82a355f | 2008-04-25 18:28:21 +0200 | [diff] [blame] | 217 | void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | { |
| 219 | unsigned long address = __fix_to_virt(idx); |
| 220 | |
| 221 | if (idx >= __end_of_fixed_addresses) { |
Ingo Molnar | 10f22dd | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 222 | printk(KERN_ERR "Invalid __set_fixmap\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | return; |
| 224 | } |
| 225 | set_pte_phys(address, phys, prot); |
| 226 | } |
| 227 | |
Andi Kleen | 7517527 | 2008-01-30 13:33:17 +0100 | [diff] [blame] | 228 | static unsigned long __initdata table_start; |
| 229 | static unsigned long __meminitdata table_end; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 231 | static __meminit void *alloc_low_page(unsigned long *phys) |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 232 | { |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 233 | unsigned long pfn = table_end++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | void *adr; |
| 235 | |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 236 | if (after_bootmem) { |
| 237 | adr = (void *)get_zeroed_page(GFP_ATOMIC); |
| 238 | *phys = __pa(adr); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 239 | |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 240 | return adr; |
| 241 | } |
| 242 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 243 | if (pfn >= end_pfn) |
| 244 | panic("alloc_low_page: ran out of memory"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 246 | adr = early_ioremap(pfn * PAGE_SIZE, PAGE_SIZE); |
| 247 | memset(adr, 0, PAGE_SIZE); |
| 248 | *phys = pfn * PAGE_SIZE; |
| 249 | return adr; |
| 250 | } |
| 251 | |
| 252 | static __meminit void unmap_low_page(void *adr) |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 253 | { |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 254 | if (after_bootmem) |
| 255 | return; |
| 256 | |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 257 | early_iounmap(adr, PAGE_SIZE); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 258 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | |
Andi Kleen | f2d3efe | 2006-03-25 16:30:22 +0100 | [diff] [blame] | 260 | /* Must run before zap_low_mappings */ |
Yasunori Goto | a3142c8 | 2007-05-08 00:23:07 -0700 | [diff] [blame] | 261 | __meminit void *early_ioremap(unsigned long addr, unsigned long size) |
Andi Kleen | f2d3efe | 2006-03-25 16:30:22 +0100 | [diff] [blame] | 262 | { |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 263 | pmd_t *pmd, *last_pmd; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 264 | unsigned long vaddr; |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 265 | int i, pmds; |
Andi Kleen | f2d3efe | 2006-03-25 16:30:22 +0100 | [diff] [blame] | 266 | |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 267 | pmds = ((addr & ~PMD_MASK) + size + ~PMD_MASK) / PMD_SIZE; |
| 268 | vaddr = __START_KERNEL_map; |
| 269 | pmd = level2_kernel_pgt; |
| 270 | last_pmd = level2_kernel_pgt + PTRS_PER_PMD - 1; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 271 | |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 272 | for (; pmd <= last_pmd; pmd++, vaddr += PMD_SIZE) { |
| 273 | for (i = 0; i < pmds; i++) { |
| 274 | if (pmd_present(pmd[i])) |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 275 | goto continue_outer_loop; |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 276 | } |
| 277 | vaddr += addr & ~PMD_MASK; |
| 278 | addr &= PMD_MASK; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 279 | |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 280 | for (i = 0; i < pmds; i++, addr += PMD_SIZE) |
Joerg Roedel | 929fd58 | 2008-01-30 13:31:08 +0100 | [diff] [blame] | 281 | set_pmd(pmd+i, __pmd(addr | __PAGE_KERNEL_LARGE_EXEC)); |
Andi Kleen | 1a2b441 | 2008-01-30 13:33:54 +0100 | [diff] [blame] | 282 | __flush_tlb_all(); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 283 | |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 284 | return (void *)vaddr; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 285 | continue_outer_loop: |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 286 | ; |
Andi Kleen | f2d3efe | 2006-03-25 16:30:22 +0100 | [diff] [blame] | 287 | } |
Ingo Molnar | 10f22dd | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 288 | printk(KERN_ERR "early_ioremap(0x%lx, %lu) failed\n", addr, size); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 289 | |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 290 | return NULL; |
Andi Kleen | f2d3efe | 2006-03-25 16:30:22 +0100 | [diff] [blame] | 291 | } |
| 292 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 293 | /* |
| 294 | * To avoid virtual aliases later: |
| 295 | */ |
Yasunori Goto | a3142c8 | 2007-05-08 00:23:07 -0700 | [diff] [blame] | 296 | __meminit void early_iounmap(void *addr, unsigned long size) |
Andi Kleen | f2d3efe | 2006-03-25 16:30:22 +0100 | [diff] [blame] | 297 | { |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 298 | unsigned long vaddr; |
| 299 | pmd_t *pmd; |
| 300 | int i, pmds; |
| 301 | |
| 302 | vaddr = (unsigned long)addr; |
| 303 | pmds = ((vaddr & ~PMD_MASK) + size + ~PMD_MASK) / PMD_SIZE; |
| 304 | pmd = level2_kernel_pgt + pmd_index(vaddr); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 305 | |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 306 | for (i = 0; i < pmds; i++) |
| 307 | pmd_clear(pmd + i); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 308 | |
Andi Kleen | 1a2b441 | 2008-01-30 13:33:54 +0100 | [diff] [blame] | 309 | __flush_tlb_all(); |
Andi Kleen | f2d3efe | 2006-03-25 16:30:22 +0100 | [diff] [blame] | 310 | } |
| 311 | |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 312 | static unsigned long __meminit |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 313 | 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] | 314 | { |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 315 | int i = pmd_index(address); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 317 | for (; i < PTRS_PER_PMD; i++, address += PMD_SIZE) { |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 318 | pmd_t *pmd = pmd_page + pmd_index(address); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 319 | |
Jan Beulich | 5f51e13 | 2006-06-26 13:59:02 +0200 | [diff] [blame] | 320 | if (address >= end) { |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 321 | if (!after_bootmem) { |
Jan Beulich | 5f51e13 | 2006-06-26 13:59:02 +0200 | [diff] [blame] | 322 | for (; i < PTRS_PER_PMD; i++, pmd++) |
| 323 | set_pmd(pmd, __pmd(0)); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 324 | } |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 325 | break; |
| 326 | } |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 327 | |
| 328 | if (pmd_val(*pmd)) |
| 329 | continue; |
| 330 | |
Andi Kleen | d4f71f7 | 2008-02-04 16:48:09 +0100 | [diff] [blame] | 331 | set_pte((pte_t *)pmd, |
| 332 | pfn_pte(address >> PAGE_SHIFT, PAGE_KERNEL_LARGE)); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 333 | } |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 334 | return address; |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 335 | } |
| 336 | |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 337 | static unsigned long __meminit |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 338 | phys_pmd_update(pud_t *pud, unsigned long address, unsigned long end) |
| 339 | { |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 340 | pmd_t *pmd = pmd_offset(pud, 0); |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 341 | unsigned long last_map_addr; |
| 342 | |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 343 | spin_lock(&init_mm.page_table_lock); |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 344 | last_map_addr = phys_pmd_init(pmd, address, end); |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 345 | spin_unlock(&init_mm.page_table_lock); |
| 346 | __flush_tlb_all(); |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 347 | return last_map_addr; |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 348 | } |
| 349 | |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 350 | static unsigned long __meminit |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 351 | phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end) |
| 352 | { |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 353 | unsigned long last_map_addr = end; |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 354 | int i = pud_index(addr); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 355 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 356 | for (; i < PTRS_PER_PUD; i++, addr = (addr & PUD_MASK) + PUD_SIZE) { |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 357 | unsigned long pmd_phys; |
| 358 | pud_t *pud = pud_page + pud_index(addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | pmd_t *pmd; |
| 360 | |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 361 | if (addr >= end) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 364 | if (!after_bootmem && |
| 365 | !e820_any_mapped(addr, addr+PUD_SIZE, 0)) { |
| 366 | set_pud(pud, __pud(0)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | continue; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 368 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 370 | if (pud_val(*pud)) { |
Andi Kleen | ef92576 | 2008-04-17 17:40:45 +0200 | [diff] [blame] | 371 | if (!pud_large(*pud)) |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 372 | last_map_addr = phys_pmd_update(pud, addr, end); |
Andi Kleen | ef92576 | 2008-04-17 17:40:45 +0200 | [diff] [blame] | 373 | continue; |
| 374 | } |
| 375 | |
| 376 | if (direct_gbpages) { |
| 377 | set_pte((pte_t *)pud, |
| 378 | pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL_LARGE)); |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 379 | last_map_addr = (addr & PUD_MASK) + PUD_SIZE; |
Keith Mannthey | 6ad9165 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 380 | continue; |
| 381 | } |
| 382 | |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 383 | pmd = alloc_low_page(&pmd_phys); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 384 | |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 385 | spin_lock(&init_mm.page_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | set_pud(pud, __pud(pmd_phys | _KERNPG_TABLE)); |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 387 | last_map_addr = phys_pmd_init(pmd, addr, end); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 388 | spin_unlock(&init_mm.page_table_lock); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 389 | |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 390 | unmap_low_page(pmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | } |
Andi Kleen | 1a2b441 | 2008-01-30 13:33:54 +0100 | [diff] [blame] | 392 | __flush_tlb_all(); |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 393 | |
| 394 | return last_map_addr >> PAGE_SHIFT; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 395 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | |
| 397 | static void __init find_early_table_space(unsigned long end) |
| 398 | { |
Andi Kleen | 6c5acd1 | 2006-01-11 22:46:57 +0100 | [diff] [blame] | 399 | unsigned long puds, pmds, tables, start; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | |
| 401 | puds = (end + PUD_SIZE - 1) >> PUD_SHIFT; |
Andi Kleen | ef92576 | 2008-04-17 17:40:45 +0200 | [diff] [blame] | 402 | tables = round_up(puds * sizeof(pud_t), PAGE_SIZE); |
| 403 | if (!direct_gbpages) { |
| 404 | pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT; |
| 405 | tables += round_up(pmds * sizeof(pmd_t), PAGE_SIZE); |
| 406 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 408 | /* |
| 409 | * RED-PEN putting page tables only on node 0 could |
| 410 | * cause a hotspot and fill up ZONE_DMA. The page tables |
| 411 | * need roughly 0.5KB per GB. |
| 412 | */ |
| 413 | start = 0x8000; |
Yinghai Lu | 24a5da7 | 2008-02-01 17:49:41 +0100 | [diff] [blame] | 414 | table_start = find_e820_area(start, end, tables, PAGE_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | if (table_start == -1UL) |
| 416 | panic("Cannot find space for the kernel page tables"); |
| 417 | |
| 418 | table_start >>= PAGE_SHIFT; |
| 419 | table_end = table_start; |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 420 | |
| 421 | early_printk("kernel direct mapping tables up to %lx @ %lx-%lx\n", |
Jan Beulich | 5f51e13 | 2006-06-26 13:59:02 +0200 | [diff] [blame] | 422 | end, table_start << PAGE_SHIFT, |
| 423 | (table_start << PAGE_SHIFT) + tables); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | } |
| 425 | |
Andi Kleen | ef92576 | 2008-04-17 17:40:45 +0200 | [diff] [blame] | 426 | static void __init init_gbpages(void) |
| 427 | { |
| 428 | if (direct_gbpages && cpu_has_gbpages) |
| 429 | printk(KERN_INFO "Using GB pages for direct mapping\n"); |
| 430 | else |
| 431 | direct_gbpages = 0; |
| 432 | } |
| 433 | |
Yinghai Lu | c64df70 | 2008-03-21 18:56:19 -0700 | [diff] [blame] | 434 | #ifdef CONFIG_MEMTEST_BOOTPARAM |
| 435 | |
| 436 | static void __init memtest(unsigned long start_phys, unsigned long size, |
| 437 | unsigned pattern) |
Yinghai Lu | 272b9ca | 2008-03-20 23:58:33 -0700 | [diff] [blame] | 438 | { |
| 439 | unsigned long i; |
| 440 | unsigned long *start; |
| 441 | unsigned long start_bad; |
| 442 | unsigned long last_bad; |
| 443 | unsigned long val; |
| 444 | unsigned long start_phys_aligned; |
| 445 | unsigned long count; |
| 446 | unsigned long incr; |
| 447 | |
| 448 | switch (pattern) { |
| 449 | case 0: |
| 450 | val = 0UL; |
| 451 | break; |
| 452 | case 1: |
| 453 | val = -1UL; |
| 454 | break; |
| 455 | case 2: |
| 456 | val = 0x5555555555555555UL; |
| 457 | break; |
| 458 | case 3: |
| 459 | val = 0xaaaaaaaaaaaaaaaaUL; |
| 460 | break; |
| 461 | default: |
| 462 | return; |
| 463 | } |
| 464 | |
| 465 | incr = sizeof(unsigned long); |
| 466 | start_phys_aligned = ALIGN(start_phys, incr); |
| 467 | count = (size - (start_phys_aligned - start_phys))/incr; |
| 468 | start = __va(start_phys_aligned); |
| 469 | start_bad = 0; |
| 470 | last_bad = 0; |
| 471 | |
| 472 | for (i = 0; i < count; i++) |
| 473 | start[i] = val; |
| 474 | for (i = 0; i < count; i++, start++, start_phys_aligned += incr) { |
| 475 | if (*start != val) { |
| 476 | if (start_phys_aligned == last_bad + incr) { |
| 477 | last_bad += incr; |
| 478 | } else { |
| 479 | if (start_bad) { |
Yinghai Lu | dcfe946 | 2008-04-15 23:17:42 -0700 | [diff] [blame] | 480 | printk(KERN_CONT "\n %016lx bad mem addr %016lx - %016lx reserved", |
Yinghai Lu | 272b9ca | 2008-03-20 23:58:33 -0700 | [diff] [blame] | 481 | val, start_bad, last_bad + incr); |
| 482 | reserve_early(start_bad, last_bad - start_bad, "BAD RAM"); |
| 483 | } |
| 484 | start_bad = last_bad = start_phys_aligned; |
| 485 | } |
| 486 | } |
| 487 | } |
| 488 | if (start_bad) { |
Yinghai Lu | dcfe946 | 2008-04-15 23:17:42 -0700 | [diff] [blame] | 489 | printk(KERN_CONT "\n %016lx bad mem addr %016lx - %016lx reserved", |
Yinghai Lu | 272b9ca | 2008-03-20 23:58:33 -0700 | [diff] [blame] | 490 | val, start_bad, last_bad + incr); |
| 491 | reserve_early(start_bad, last_bad - start_bad, "BAD RAM"); |
| 492 | } |
| 493 | |
| 494 | } |
| 495 | |
Yinghai Lu | c64df70 | 2008-03-21 18:56:19 -0700 | [diff] [blame] | 496 | static int memtest_pattern __initdata = CONFIG_MEMTEST_BOOTPARAM_VALUE; |
| 497 | |
Yinghai Lu | 272b9ca | 2008-03-20 23:58:33 -0700 | [diff] [blame] | 498 | static int __init parse_memtest(char *arg) |
| 499 | { |
| 500 | if (arg) |
Yinghai Lu | c64df70 | 2008-03-21 18:56:19 -0700 | [diff] [blame] | 501 | memtest_pattern = simple_strtoul(arg, NULL, 0); |
Yinghai Lu | 272b9ca | 2008-03-20 23:58:33 -0700 | [diff] [blame] | 502 | return 0; |
| 503 | } |
| 504 | |
| 505 | early_param("memtest", parse_memtest); |
| 506 | |
| 507 | static void __init early_memtest(unsigned long start, unsigned long end) |
| 508 | { |
| 509 | unsigned long t_start, t_size; |
| 510 | unsigned pattern; |
| 511 | |
Yinghai Lu | c64df70 | 2008-03-21 18:56:19 -0700 | [diff] [blame] | 512 | if (!memtest_pattern) |
| 513 | return; |
| 514 | |
| 515 | printk(KERN_INFO "early_memtest: pattern num %d", memtest_pattern); |
Yinghai Lu | 272b9ca | 2008-03-20 23:58:33 -0700 | [diff] [blame] | 516 | for (pattern = 0; pattern < memtest_pattern; pattern++) { |
| 517 | t_start = start; |
| 518 | t_size = 0; |
| 519 | while (t_start < end) { |
| 520 | t_start = find_e820_area_size(t_start, &t_size, 1); |
| 521 | |
| 522 | /* done ? */ |
| 523 | if (t_start >= end) |
| 524 | break; |
| 525 | if (t_start + t_size > end) |
| 526 | t_size = end - t_start; |
| 527 | |
| 528 | printk(KERN_CONT "\n %016lx - %016lx pattern %d", |
| 529 | t_start, t_start + t_size, pattern); |
| 530 | |
| 531 | memtest(t_start, t_size, pattern); |
| 532 | |
| 533 | t_start += t_size; |
| 534 | } |
| 535 | } |
Yinghai Lu | c64df70 | 2008-03-21 18:56:19 -0700 | [diff] [blame] | 536 | printk(KERN_CONT "\n"); |
Yinghai Lu | 272b9ca | 2008-03-20 23:58:33 -0700 | [diff] [blame] | 537 | } |
Yinghai Lu | c64df70 | 2008-03-21 18:56:19 -0700 | [diff] [blame] | 538 | #else |
| 539 | static void __init early_memtest(unsigned long start, unsigned long end) |
| 540 | { |
| 541 | } |
| 542 | #endif |
Yinghai Lu | 272b9ca | 2008-03-20 23:58:33 -0700 | [diff] [blame] | 543 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 544 | /* |
| 545 | * Setup the direct mapping of the physical memory at PAGE_OFFSET. |
| 546 | * This runs before bootmem is initialized and gets pages directly from |
| 547 | * the physical memory. To access them they are temporarily mapped. |
| 548 | */ |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 549 | 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] | 550 | { |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 551 | unsigned long next, last_map_addr = end; |
Yinghai Lu | 272b9ca | 2008-03-20 23:58:33 -0700 | [diff] [blame] | 552 | unsigned long start_phys = start, end_phys = end; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | |
Yinghai Lu | 272b9ca | 2008-03-20 23:58:33 -0700 | [diff] [blame] | 554 | printk(KERN_INFO "init_memory_mapping\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 556 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | * Find space for the kernel direct mapping tables. |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 558 | * |
| 559 | * Later we should allocate these tables in the local node of the |
| 560 | * memory mapped. Unfortunately this is done currently before the |
| 561 | * nodes are discovered. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | */ |
Andi Kleen | ef92576 | 2008-04-17 17:40:45 +0200 | [diff] [blame] | 563 | if (!after_bootmem) { |
| 564 | init_gbpages(); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 565 | find_early_table_space(end); |
Andi Kleen | ef92576 | 2008-04-17 17:40:45 +0200 | [diff] [blame] | 566 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | |
| 568 | start = (unsigned long)__va(start); |
| 569 | end = (unsigned long)__va(end); |
| 570 | |
| 571 | for (; start < end; start = next) { |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 572 | pgd_t *pgd = pgd_offset_k(start); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 573 | unsigned long pud_phys; |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 574 | pud_t *pud; |
| 575 | |
| 576 | if (after_bootmem) |
Andi Kleen | d2ae5b5 | 2006-06-26 13:57:56 +0200 | [diff] [blame] | 577 | pud = pud_offset(pgd, start & PGDIR_MASK); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 578 | else |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 579 | pud = alloc_low_page(&pud_phys); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 580 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | next = start + PGDIR_SIZE; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 582 | if (next > end) |
| 583 | next = end; |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 584 | last_map_addr = phys_pud_init(pud, __pa(start), __pa(next)); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 585 | if (!after_bootmem) |
| 586 | set_pgd(pgd_offset_k(start), mk_kernel_pgd(pud_phys)); |
Vivek Goyal | dafe41e | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 587 | unmap_low_page(pud); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 588 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 590 | if (!after_bootmem) |
Glauber de Oliveira Costa | f51c945 | 2007-07-22 11:12:29 +0200 | [diff] [blame] | 591 | mmu_cr4_features = read_cr4(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | __flush_tlb_all(); |
Andi Kleen | 7517527 | 2008-01-30 13:33:17 +0100 | [diff] [blame] | 593 | |
Yinghai Lu | 24a5da7 | 2008-02-01 17:49:41 +0100 | [diff] [blame] | 594 | if (!after_bootmem) |
| 595 | reserve_early(table_start << PAGE_SHIFT, |
| 596 | table_end << PAGE_SHIFT, "PGTABLE"); |
Yinghai Lu | 272b9ca | 2008-03-20 23:58:33 -0700 | [diff] [blame] | 597 | |
| 598 | if (!after_bootmem) |
| 599 | early_memtest(start_phys, end_phys); |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 600 | |
| 601 | return last_map_addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | } |
| 603 | |
Matt Tolentino | 2b97690 | 2005-06-23 00:08:06 -0700 | [diff] [blame] | 604 | #ifndef CONFIG_NUMA |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | void __init paging_init(void) |
| 606 | { |
Mel Gorman | 6391af1 | 2006-10-11 01:20:39 -0700 | [diff] [blame] | 607 | unsigned long max_zone_pfns[MAX_NR_ZONES]; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 608 | |
Mel Gorman | 6391af1 | 2006-10-11 01:20:39 -0700 | [diff] [blame] | 609 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); |
| 610 | max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN; |
| 611 | max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN; |
| 612 | max_zone_pfns[ZONE_NORMAL] = end_pfn; |
| 613 | |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 614 | memory_present(0, 0, end_pfn); |
| 615 | sparse_init(); |
Mel Gorman | 5cb248a | 2006-09-27 01:49:52 -0700 | [diff] [blame] | 616 | free_area_init_nodes(max_zone_pfns); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | } |
| 618 | #endif |
| 619 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 620 | /* |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 621 | * Memory hotplug specific functions |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 622 | */ |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 623 | void online_page(struct page *page) |
| 624 | { |
| 625 | ClearPageReserved(page); |
Nick Piggin | 7835e98 | 2006-03-22 00:08:40 -0800 | [diff] [blame] | 626 | init_page_count(page); |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 627 | __free_page(page); |
| 628 | totalram_pages++; |
| 629 | num_physpages++; |
| 630 | } |
| 631 | |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 632 | #ifdef CONFIG_MEMORY_HOTPLUG |
| 633 | /* |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 634 | * Memory is added always to NORMAL zone. This means you will never get |
| 635 | * additional DMA/DMA32 memory. |
| 636 | */ |
| 637 | int arch_add_memory(int nid, u64 start, u64 size) |
| 638 | { |
| 639 | struct pglist_data *pgdat = NODE_DATA(nid); |
Christoph Lameter | 776ed98 | 2006-09-25 23:31:09 -0700 | [diff] [blame] | 640 | struct zone *zone = pgdat->node_zones + ZONE_NORMAL; |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 641 | unsigned long last_mapped_pfn, start_pfn = start >> PAGE_SHIFT; |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 642 | unsigned long nr_pages = size >> PAGE_SHIFT; |
| 643 | int ret; |
| 644 | |
Andi Kleen | cc61503 | 2008-03-12 03:53:28 +0100 | [diff] [blame] | 645 | last_mapped_pfn = init_memory_mapping(start, start + size-1); |
| 646 | if (last_mapped_pfn > max_pfn_mapped) |
| 647 | max_pfn_mapped = last_mapped_pfn; |
Keith Mannthey | 45e0b78 | 2006-09-30 23:27:09 -0700 | [diff] [blame] | 648 | |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 649 | ret = __add_pages(zone, start_pfn, nr_pages); |
Ingo Molnar | 10f22dd | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 650 | WARN_ON(1); |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 651 | |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 652 | return ret; |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 653 | } |
| 654 | EXPORT_SYMBOL_GPL(arch_add_memory); |
| 655 | |
Yasunori Goto | 8243229 | 2006-11-18 22:19:40 -0800 | [diff] [blame] | 656 | #if !defined(CONFIG_ACPI_NUMA) && defined(CONFIG_NUMA) |
Keith Mannthey | 4942e99 | 2006-09-30 23:27:06 -0700 | [diff] [blame] | 657 | int memory_add_physaddr_to_nid(u64 start) |
| 658 | { |
| 659 | return 0; |
| 660 | } |
Keith Mannthey | 8c2676a | 2006-09-30 23:27:07 -0700 | [diff] [blame] | 661 | EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid); |
Keith Mannthey | 4942e99 | 2006-09-30 23:27:06 -0700 | [diff] [blame] | 662 | #endif |
| 663 | |
Keith Mannthey | 45e0b78 | 2006-09-30 23:27:09 -0700 | [diff] [blame] | 664 | #endif /* CONFIG_MEMORY_HOTPLUG */ |
| 665 | |
Arjan van de Ven | ae531c2 | 2008-04-24 23:40:47 +0200 | [diff] [blame] | 666 | /* |
| 667 | * devmem_is_allowed() checks to see if /dev/mem access to a certain address |
| 668 | * is valid. The argument is a physical page number. |
| 669 | * |
| 670 | * |
| 671 | * On x86, access has to be given to the first megabyte of ram because that area |
| 672 | * contains bios code and data regions used by X and dosemu and similar apps. |
| 673 | * Access has to be given to non-kernel-ram areas as well, these contain the PCI |
| 674 | * mmio resources as well as potential bios/acpi data regions. |
| 675 | */ |
| 676 | int devmem_is_allowed(unsigned long pagenr) |
| 677 | { |
| 678 | if (pagenr <= 256) |
| 679 | return 1; |
| 680 | if (!page_is_ram(pagenr)) |
| 681 | return 1; |
| 682 | return 0; |
| 683 | } |
| 684 | |
| 685 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 686 | static struct kcore_list kcore_mem, kcore_vmalloc, kcore_kernel, |
| 687 | kcore_modules, kcore_vsyscall; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | |
| 689 | void __init mem_init(void) |
| 690 | { |
Andi Kleen | 0a43e4b | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 691 | long codesize, reservedpages, datasize, initsize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | |
Jon Mason | 0dc243a | 2006-06-26 13:58:11 +0200 | [diff] [blame] | 693 | pci_iommu_alloc(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 694 | |
Yinghai Lu | 48ddb15 | 2008-01-30 13:32:36 +0100 | [diff] [blame] | 695 | /* clear_bss() already clear the empty_zero_page */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | |
| 697 | reservedpages = 0; |
| 698 | |
| 699 | /* this will put all low memory onto the freelists */ |
Matt Tolentino | 2b97690 | 2005-06-23 00:08:06 -0700 | [diff] [blame] | 700 | #ifdef CONFIG_NUMA |
Andi Kleen | 0a43e4b | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 701 | totalram_pages = numa_free_all_bootmem(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | #else |
Andi Kleen | 0a43e4b | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 703 | totalram_pages = free_all_bootmem(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | #endif |
Mel Gorman | 5cb248a | 2006-09-27 01:49:52 -0700 | [diff] [blame] | 705 | reservedpages = end_pfn - totalram_pages - |
| 706 | absent_pages_in_range(0, end_pfn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | after_bootmem = 1; |
| 708 | |
| 709 | codesize = (unsigned long) &_etext - (unsigned long) &_text; |
| 710 | datasize = (unsigned long) &_edata - (unsigned long) &_etext; |
| 711 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; |
| 712 | |
| 713 | /* Register memory areas for /proc/kcore */ |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 714 | kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT); |
| 715 | kclist_add(&kcore_vmalloc, (void *)VMALLOC_START, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | VMALLOC_END-VMALLOC_START); |
| 717 | kclist_add(&kcore_kernel, &_stext, _end - _stext); |
| 718 | kclist_add(&kcore_modules, (void *)MODULES_VADDR, MODULES_LEN); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 719 | kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | VSYSCALL_END - VSYSCALL_START); |
| 721 | |
Ingo Molnar | 10f22dd | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 722 | printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, " |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 723 | "%ldk reserved, %ldk data, %ldk init)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), |
| 725 | end_pfn << (PAGE_SHIFT-10), |
| 726 | codesize >> 10, |
| 727 | reservedpages << (PAGE_SHIFT-10), |
| 728 | datasize >> 10, |
| 729 | initsize >> 10); |
Thomas Gleixner | 76ebd05 | 2008-02-09 23:24:09 +0100 | [diff] [blame] | 730 | |
| 731 | cpa_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | } |
| 733 | |
Gerd Hoffmann | d167a51 | 2006-06-26 13:56:16 +0200 | [diff] [blame] | 734 | void free_init_pages(char *what, unsigned long begin, unsigned long end) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | { |
Thomas Gleixner | bfc734b | 2008-02-09 23:24:09 +0100 | [diff] [blame] | 736 | unsigned long addr = begin; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | |
Thomas Gleixner | bfc734b | 2008-02-09 23:24:09 +0100 | [diff] [blame] | 738 | if (addr >= end) |
Gerd Hoffmann | d167a51 | 2006-06-26 13:56:16 +0200 | [diff] [blame] | 739 | return; |
| 740 | |
Ingo Molnar | ee01f11 | 2008-01-30 13:34:09 +0100 | [diff] [blame] | 741 | /* |
| 742 | * If debugging page accesses then do not free this memory but |
| 743 | * mark them not present - any buggy init-section access will |
| 744 | * create a kernel page fault: |
| 745 | */ |
| 746 | #ifdef CONFIG_DEBUG_PAGEALLOC |
| 747 | printk(KERN_INFO "debug: unmapping init memory %08lx..%08lx\n", |
| 748 | begin, PAGE_ALIGN(end)); |
| 749 | set_memory_np(begin, (end - begin) >> PAGE_SHIFT); |
| 750 | #else |
Jan Beulich | 6fb1475 | 2007-05-02 19:27:10 +0200 | [diff] [blame] | 751 | printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 752 | |
Thomas Gleixner | bfc734b | 2008-02-09 23:24:09 +0100 | [diff] [blame] | 753 | for (; addr < end; addr += PAGE_SIZE) { |
Linus Torvalds | e3ebadd | 2007-05-07 08:44:24 -0700 | [diff] [blame] | 754 | ClearPageReserved(virt_to_page(addr)); |
| 755 | init_page_count(virt_to_page(addr)); |
| 756 | memset((void *)(addr & ~(PAGE_SIZE-1)), |
| 757 | POISON_FREE_INITMEM, PAGE_SIZE); |
Linus Torvalds | e3ebadd | 2007-05-07 08:44:24 -0700 | [diff] [blame] | 758 | free_page(addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | totalram_pages++; |
| 760 | } |
Ingo Molnar | ee01f11 | 2008-01-30 13:34:09 +0100 | [diff] [blame] | 761 | #endif |
Gerd Hoffmann | d167a51 | 2006-06-26 13:56:16 +0200 | [diff] [blame] | 762 | } |
| 763 | |
| 764 | void free_initmem(void) |
| 765 | { |
Gerd Hoffmann | d167a51 | 2006-06-26 13:56:16 +0200 | [diff] [blame] | 766 | free_init_pages("unused kernel memory", |
Linus Torvalds | e3ebadd | 2007-05-07 08:44:24 -0700 | [diff] [blame] | 767 | (unsigned long)(&__init_begin), |
| 768 | (unsigned long)(&__init_end)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | } |
| 770 | |
Arjan van de Ven | 67df197 | 2006-01-06 00:12:04 -0800 | [diff] [blame] | 771 | #ifdef CONFIG_DEBUG_RODATA |
Arjan van de Ven | edeed30 | 2008-01-30 13:34:08 +0100 | [diff] [blame] | 772 | const int rodata_test_data = 0xC3; |
| 773 | EXPORT_SYMBOL_GPL(rodata_test_data); |
Arjan van de Ven | 67df197 | 2006-01-06 00:12:04 -0800 | [diff] [blame] | 774 | |
Arjan van de Ven | 67df197 | 2006-01-06 00:12:04 -0800 | [diff] [blame] | 775 | void mark_rodata_ro(void) |
| 776 | { |
Mathieu Desnoyers | 4e4eee0 | 2008-02-02 15:42:20 -0500 | [diff] [blame] | 777 | 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] | 778 | |
Jan Beulich | 6fb1475 | 2007-05-02 19:27:10 +0200 | [diff] [blame] | 779 | printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n", |
Linus Torvalds | e3ebadd | 2007-05-07 08:44:24 -0700 | [diff] [blame] | 780 | (end - start) >> 10); |
Arjan van de Ven | 984bb80 | 2008-02-06 22:39:45 +0100 | [diff] [blame] | 781 | set_memory_ro(start, (end - start) >> PAGE_SHIFT); |
| 782 | |
| 783 | /* |
| 784 | * The rodata section (but not the kernel text!) should also be |
| 785 | * not-executable. |
| 786 | */ |
| 787 | start = ((unsigned long)__start_rodata + PAGE_SIZE - 1) & PAGE_MASK; |
| 788 | set_memory_nx(start, (end - start) >> PAGE_SHIFT); |
Arjan van de Ven | 67df197 | 2006-01-06 00:12:04 -0800 | [diff] [blame] | 789 | |
Arjan van de Ven | 1a48725 | 2008-01-30 13:34:09 +0100 | [diff] [blame] | 790 | rodata_test(); |
| 791 | |
Andi Kleen | 0c42f39 | 2008-01-30 13:33:42 +0100 | [diff] [blame] | 792 | #ifdef CONFIG_CPA_DEBUG |
Ingo Molnar | 10f22dd | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 793 | 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] | 794 | set_memory_rw(start, (end-start) >> PAGE_SHIFT); |
Andi Kleen | 0c42f39 | 2008-01-30 13:33:42 +0100 | [diff] [blame] | 795 | |
Ingo Molnar | 10f22dd | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 796 | printk(KERN_INFO "Testing CPA: again\n"); |
Arjan van de Ven | 6d238cc | 2008-01-30 13:34:06 +0100 | [diff] [blame] | 797 | set_memory_ro(start, (end-start) >> PAGE_SHIFT); |
Andi Kleen | 0c42f39 | 2008-01-30 13:33:42 +0100 | [diff] [blame] | 798 | #endif |
Arjan van de Ven | 67df197 | 2006-01-06 00:12:04 -0800 | [diff] [blame] | 799 | } |
Mathieu Desnoyers | 4e4eee0 | 2008-02-02 15:42:20 -0500 | [diff] [blame] | 800 | |
Arjan van de Ven | 67df197 | 2006-01-06 00:12:04 -0800 | [diff] [blame] | 801 | #endif |
| 802 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | #ifdef CONFIG_BLK_DEV_INITRD |
| 804 | void free_initrd_mem(unsigned long start, unsigned long end) |
| 805 | { |
Linus Torvalds | e3ebadd | 2007-05-07 08:44:24 -0700 | [diff] [blame] | 806 | free_init_pages("initrd memory", start, end); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | } |
| 808 | #endif |
| 809 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 810 | void __init reserve_bootmem_generic(unsigned long phys, unsigned len) |
| 811 | { |
Matt Tolentino | 2b97690 | 2005-06-23 00:08:06 -0700 | [diff] [blame] | 812 | #ifdef CONFIG_NUMA |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | int nid = phys_to_nid(phys); |
Andi Kleen | 5e58a02 | 2006-11-14 16:57:46 +0100 | [diff] [blame] | 814 | #endif |
| 815 | unsigned long pfn = phys >> PAGE_SHIFT; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 816 | |
Andi Kleen | 5e58a02 | 2006-11-14 16:57:46 +0100 | [diff] [blame] | 817 | if (pfn >= end_pfn) { |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 818 | /* |
| 819 | * This can happen with kdump kernels when accessing |
| 820 | * firmware tables: |
| 821 | */ |
Thomas Gleixner | 6779429 | 2008-03-21 21:27:10 +0100 | [diff] [blame] | 822 | if (pfn < max_pfn_mapped) |
Andi Kleen | 5e58a02 | 2006-11-14 16:57:46 +0100 | [diff] [blame] | 823 | return; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 824 | |
Andi Kleen | 5e58a02 | 2006-11-14 16:57:46 +0100 | [diff] [blame] | 825 | printk(KERN_ERR "reserve_bootmem: illegal reserve %lx %u\n", |
| 826 | phys, len); |
| 827 | return; |
| 828 | } |
| 829 | |
| 830 | /* Should check here against the e820 map to avoid double free */ |
| 831 | #ifdef CONFIG_NUMA |
Bernhard Walle | 72a7fe3 | 2008-02-07 00:15:17 -0800 | [diff] [blame] | 832 | reserve_bootmem_node(NODE_DATA(nid), phys, len, BOOTMEM_DEFAULT); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 833 | #else |
Bernhard Walle | 72a7fe3 | 2008-02-07 00:15:17 -0800 | [diff] [blame] | 834 | reserve_bootmem(phys, len, BOOTMEM_DEFAULT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | #endif |
Mel Gorman | 0e0b864 | 2006-09-27 01:49:56 -0700 | [diff] [blame] | 836 | if (phys+len <= MAX_DMA_PFN*PAGE_SIZE) { |
Andi Kleen | e18c687 | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 837 | dma_reserve += len / PAGE_SIZE; |
Mel Gorman | 0e0b864 | 2006-09-27 01:49:56 -0700 | [diff] [blame] | 838 | set_dma_reserve(dma_reserve); |
| 839 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | } |
| 841 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 842 | int kern_addr_valid(unsigned long addr) |
| 843 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 845 | pgd_t *pgd; |
| 846 | pud_t *pud; |
| 847 | pmd_t *pmd; |
| 848 | pte_t *pte; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | |
| 850 | if (above != 0 && above != -1UL) |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 851 | return 0; |
| 852 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | pgd = pgd_offset_k(addr); |
| 854 | if (pgd_none(*pgd)) |
| 855 | return 0; |
| 856 | |
| 857 | pud = pud_offset(pgd, addr); |
| 858 | if (pud_none(*pud)) |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 859 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | |
| 861 | pmd = pmd_offset(pud, addr); |
| 862 | if (pmd_none(*pmd)) |
| 863 | return 0; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 864 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | if (pmd_large(*pmd)) |
| 866 | return pfn_valid(pmd_pfn(*pmd)); |
| 867 | |
| 868 | pte = pte_offset_kernel(pmd, addr); |
| 869 | if (pte_none(*pte)) |
| 870 | return 0; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 871 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | return pfn_valid(pte_pfn(*pte)); |
| 873 | } |
| 874 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 875 | /* |
| 876 | * A pseudo VMA to allow ptrace access for the vsyscall page. This only |
| 877 | * covers the 64bit vsyscall page now. 32bit has a real VMA now and does |
| 878 | * not need special handling anymore: |
| 879 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | static struct vm_area_struct gate_vma = { |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 881 | .vm_start = VSYSCALL_START, |
| 882 | .vm_end = VSYSCALL_START + (VSYSCALL_MAPPED_PAGES * PAGE_SIZE), |
| 883 | .vm_page_prot = PAGE_READONLY_EXEC, |
| 884 | .vm_flags = VM_READ | VM_EXEC |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | }; |
| 886 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | struct vm_area_struct *get_gate_vma(struct task_struct *tsk) |
| 888 | { |
| 889 | #ifdef CONFIG_IA32_EMULATION |
Andi Kleen | 1e01441 | 2005-04-16 15:24:55 -0700 | [diff] [blame] | 890 | if (test_tsk_thread_flag(tsk, TIF_IA32)) |
| 891 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 892 | #endif |
| 893 | return &gate_vma; |
| 894 | } |
| 895 | |
| 896 | int in_gate_area(struct task_struct *task, unsigned long addr) |
| 897 | { |
| 898 | struct vm_area_struct *vma = get_gate_vma(task); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 899 | |
Andi Kleen | 1e01441 | 2005-04-16 15:24:55 -0700 | [diff] [blame] | 900 | if (!vma) |
| 901 | return 0; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 902 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 903 | return (addr >= vma->vm_start) && (addr < vma->vm_end); |
| 904 | } |
| 905 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 906 | /* |
| 907 | * Use this when you have no reliable task/vma, typically from interrupt |
| 908 | * context. It is less reliable than using the task's vma and may give |
| 909 | * false positives: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 910 | */ |
| 911 | int in_gate_area_no_task(unsigned long addr) |
| 912 | { |
Andi Kleen | 1e01441 | 2005-04-16 15:24:55 -0700 | [diff] [blame] | 913 | return (addr >= VSYSCALL_START) && (addr < VSYSCALL_END); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | } |
Zou Nan hai | 2e1c49d | 2007-06-01 00:46:28 -0700 | [diff] [blame] | 915 | |
Andi Kleen | 2aae950 | 2007-07-21 17:10:01 +0200 | [diff] [blame] | 916 | const char *arch_vma_name(struct vm_area_struct *vma) |
| 917 | { |
| 918 | if (vma->vm_mm && vma->vm_start == (long)vma->vm_mm->context.vdso) |
| 919 | return "[vdso]"; |
| 920 | if (vma == &gate_vma) |
| 921 | return "[vsyscall]"; |
| 922 | return NULL; |
| 923 | } |
Christoph Lameter | 0889eba | 2007-10-16 01:24:15 -0700 | [diff] [blame] | 924 | |
| 925 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
| 926 | /* |
| 927 | * Initialise the sparsemem vmemmap using huge-pages at the PMD level. |
| 928 | */ |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 929 | int __meminit |
| 930 | vmemmap_populate(struct page *start_page, unsigned long size, int node) |
Christoph Lameter | 0889eba | 2007-10-16 01:24:15 -0700 | [diff] [blame] | 931 | { |
| 932 | unsigned long addr = (unsigned long)start_page; |
| 933 | unsigned long end = (unsigned long)(start_page + size); |
| 934 | unsigned long next; |
| 935 | pgd_t *pgd; |
| 936 | pud_t *pud; |
| 937 | pmd_t *pmd; |
| 938 | |
| 939 | for (; addr < end; addr = next) { |
| 940 | next = pmd_addr_end(addr, end); |
| 941 | |
| 942 | pgd = vmemmap_pgd_populate(addr, node); |
| 943 | if (!pgd) |
| 944 | return -ENOMEM; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 945 | |
Christoph Lameter | 0889eba | 2007-10-16 01:24:15 -0700 | [diff] [blame] | 946 | pud = vmemmap_pud_populate(pgd, addr, node); |
| 947 | if (!pud) |
| 948 | return -ENOMEM; |
| 949 | |
| 950 | pmd = pmd_offset(pud, addr); |
| 951 | if (pmd_none(*pmd)) { |
| 952 | pte_t entry; |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 953 | void *p; |
| 954 | |
| 955 | p = vmemmap_alloc_block(PMD_SIZE, node); |
Christoph Lameter | 0889eba | 2007-10-16 01:24:15 -0700 | [diff] [blame] | 956 | if (!p) |
| 957 | return -ENOMEM; |
| 958 | |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 959 | entry = pfn_pte(__pa(p) >> PAGE_SHIFT, |
| 960 | PAGE_KERNEL_LARGE); |
Christoph Lameter | 0889eba | 2007-10-16 01:24:15 -0700 | [diff] [blame] | 961 | set_pmd(pmd, __pmd(pte_val(entry))); |
| 962 | |
| 963 | printk(KERN_DEBUG " [%lx-%lx] PMD ->%p on node %d\n", |
| 964 | addr, addr + PMD_SIZE - 1, p, node); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 965 | } else { |
Christoph Lameter | 0889eba | 2007-10-16 01:24:15 -0700 | [diff] [blame] | 966 | vmemmap_verify((pte_t *)pmd, node, addr, next); |
Thomas Gleixner | 14a62c3 | 2008-01-30 13:34:10 +0100 | [diff] [blame] | 967 | } |
Christoph Lameter | 0889eba | 2007-10-16 01:24:15 -0700 | [diff] [blame] | 968 | } |
Christoph Lameter | 0889eba | 2007-10-16 01:24:15 -0700 | [diff] [blame] | 969 | return 0; |
| 970 | } |
| 971 | #endif |