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 | |
| 9 | #include <linux/config.h> |
| 10 | #include <linux/signal.h> |
| 11 | #include <linux/sched.h> |
| 12 | #include <linux/kernel.h> |
| 13 | #include <linux/errno.h> |
| 14 | #include <linux/string.h> |
| 15 | #include <linux/types.h> |
| 16 | #include <linux/ptrace.h> |
| 17 | #include <linux/mman.h> |
| 18 | #include <linux/mm.h> |
| 19 | #include <linux/swap.h> |
| 20 | #include <linux/smp.h> |
| 21 | #include <linux/init.h> |
| 22 | #include <linux/pagemap.h> |
| 23 | #include <linux/bootmem.h> |
| 24 | #include <linux/proc_fs.h> |
| 25 | |
| 26 | #include <asm/processor.h> |
| 27 | #include <asm/system.h> |
| 28 | #include <asm/uaccess.h> |
| 29 | #include <asm/pgtable.h> |
| 30 | #include <asm/pgalloc.h> |
| 31 | #include <asm/dma.h> |
| 32 | #include <asm/fixmap.h> |
| 33 | #include <asm/e820.h> |
| 34 | #include <asm/apic.h> |
| 35 | #include <asm/tlb.h> |
| 36 | #include <asm/mmu_context.h> |
| 37 | #include <asm/proto.h> |
| 38 | #include <asm/smp.h> |
| 39 | |
| 40 | #ifndef Dprintk |
| 41 | #define Dprintk(x...) |
| 42 | #endif |
| 43 | |
| 44 | #ifdef CONFIG_GART_IOMMU |
| 45 | extern int swiotlb; |
| 46 | #endif |
| 47 | |
| 48 | extern char _stext[]; |
| 49 | |
| 50 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); |
| 51 | |
| 52 | /* |
| 53 | * NOTE: pagetable_init alloc all the fixmap pagetables contiguous on the |
| 54 | * physical space so we can cache the place of the first one and move |
| 55 | * around without checking the pgd every time. |
| 56 | */ |
| 57 | |
| 58 | void show_mem(void) |
| 59 | { |
| 60 | int i, total = 0, reserved = 0; |
| 61 | int shared = 0, cached = 0; |
| 62 | pg_data_t *pgdat; |
| 63 | struct page *page; |
| 64 | |
| 65 | printk("Mem-info:\n"); |
| 66 | show_free_areas(); |
| 67 | printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); |
| 68 | |
| 69 | for_each_pgdat(pgdat) { |
| 70 | for (i = 0; i < pgdat->node_spanned_pages; ++i) { |
| 71 | page = pfn_to_page(pgdat->node_start_pfn + i); |
| 72 | total++; |
| 73 | if (PageReserved(page)) |
| 74 | reserved++; |
| 75 | else if (PageSwapCache(page)) |
| 76 | cached++; |
| 77 | else if (page_count(page)) |
| 78 | shared += page_count(page) - 1; |
| 79 | } |
| 80 | } |
| 81 | printk("%d pages of RAM\n", total); |
| 82 | printk("%d reserved pages\n",reserved); |
| 83 | printk("%d pages shared\n",shared); |
| 84 | printk("%d pages swap cached\n",cached); |
| 85 | } |
| 86 | |
| 87 | /* References to section boundaries */ |
| 88 | |
| 89 | extern char _text, _etext, _edata, __bss_start, _end[]; |
| 90 | extern char __init_begin, __init_end; |
| 91 | |
| 92 | int after_bootmem; |
| 93 | |
| 94 | static void *spp_getpage(void) |
| 95 | { |
| 96 | void *ptr; |
| 97 | if (after_bootmem) |
| 98 | ptr = (void *) get_zeroed_page(GFP_ATOMIC); |
| 99 | else |
| 100 | ptr = alloc_bootmem_pages(PAGE_SIZE); |
| 101 | if (!ptr || ((unsigned long)ptr & ~PAGE_MASK)) |
| 102 | panic("set_pte_phys: cannot allocate page data %s\n", after_bootmem?"after bootmem":""); |
| 103 | |
| 104 | Dprintk("spp_getpage %p\n", ptr); |
| 105 | return ptr; |
| 106 | } |
| 107 | |
| 108 | static void set_pte_phys(unsigned long vaddr, |
| 109 | unsigned long phys, pgprot_t prot) |
| 110 | { |
| 111 | pgd_t *pgd; |
| 112 | pud_t *pud; |
| 113 | pmd_t *pmd; |
| 114 | pte_t *pte, new_pte; |
| 115 | |
| 116 | Dprintk("set_pte_phys %lx to %lx\n", vaddr, phys); |
| 117 | |
| 118 | pgd = pgd_offset_k(vaddr); |
| 119 | if (pgd_none(*pgd)) { |
| 120 | printk("PGD FIXMAP MISSING, it should be setup in head.S!\n"); |
| 121 | return; |
| 122 | } |
| 123 | pud = pud_offset(pgd, vaddr); |
| 124 | if (pud_none(*pud)) { |
| 125 | pmd = (pmd_t *) spp_getpage(); |
| 126 | set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE | _PAGE_USER)); |
| 127 | if (pmd != pmd_offset(pud, 0)) { |
| 128 | printk("PAGETABLE BUG #01! %p <-> %p\n", pmd, pmd_offset(pud,0)); |
| 129 | return; |
| 130 | } |
| 131 | } |
| 132 | pmd = pmd_offset(pud, vaddr); |
| 133 | if (pmd_none(*pmd)) { |
| 134 | pte = (pte_t *) spp_getpage(); |
| 135 | set_pmd(pmd, __pmd(__pa(pte) | _KERNPG_TABLE | _PAGE_USER)); |
| 136 | if (pte != pte_offset_kernel(pmd, 0)) { |
| 137 | printk("PAGETABLE BUG #02!\n"); |
| 138 | return; |
| 139 | } |
| 140 | } |
| 141 | new_pte = pfn_pte(phys >> PAGE_SHIFT, prot); |
| 142 | |
| 143 | pte = pte_offset_kernel(pmd, vaddr); |
| 144 | if (!pte_none(*pte) && |
| 145 | pte_val(*pte) != (pte_val(new_pte) & __supported_pte_mask)) |
| 146 | pte_ERROR(*pte); |
| 147 | set_pte(pte, new_pte); |
| 148 | |
| 149 | /* |
| 150 | * It's enough to flush this one mapping. |
| 151 | * (PGE mappings get flushed as well) |
| 152 | */ |
| 153 | __flush_tlb_one(vaddr); |
| 154 | } |
| 155 | |
| 156 | /* NOTE: this is meant to be run only at boot */ |
| 157 | void __set_fixmap (enum fixed_addresses idx, unsigned long phys, pgprot_t prot) |
| 158 | { |
| 159 | unsigned long address = __fix_to_virt(idx); |
| 160 | |
| 161 | if (idx >= __end_of_fixed_addresses) { |
| 162 | printk("Invalid __set_fixmap\n"); |
| 163 | return; |
| 164 | } |
| 165 | set_pte_phys(address, phys, prot); |
| 166 | } |
| 167 | |
| 168 | unsigned long __initdata table_start, table_end; |
| 169 | |
| 170 | extern pmd_t temp_boot_pmds[]; |
| 171 | |
| 172 | static struct temp_map { |
| 173 | pmd_t *pmd; |
| 174 | void *address; |
| 175 | int allocated; |
| 176 | } temp_mappings[] __initdata = { |
| 177 | { &temp_boot_pmds[0], (void *)(40UL * 1024 * 1024) }, |
| 178 | { &temp_boot_pmds[1], (void *)(42UL * 1024 * 1024) }, |
| 179 | {} |
| 180 | }; |
| 181 | |
| 182 | static __init void *alloc_low_page(int *index, unsigned long *phys) |
| 183 | { |
| 184 | struct temp_map *ti; |
| 185 | int i; |
| 186 | unsigned long pfn = table_end++, paddr; |
| 187 | void *adr; |
| 188 | |
| 189 | if (pfn >= end_pfn) |
| 190 | panic("alloc_low_page: ran out of memory"); |
| 191 | for (i = 0; temp_mappings[i].allocated; i++) { |
| 192 | if (!temp_mappings[i].pmd) |
| 193 | panic("alloc_low_page: ran out of temp mappings"); |
| 194 | } |
| 195 | ti = &temp_mappings[i]; |
| 196 | paddr = (pfn << PAGE_SHIFT) & PMD_MASK; |
| 197 | set_pmd(ti->pmd, __pmd(paddr | _KERNPG_TABLE | _PAGE_PSE)); |
| 198 | ti->allocated = 1; |
| 199 | __flush_tlb(); |
| 200 | adr = ti->address + ((pfn << PAGE_SHIFT) & ~PMD_MASK); |
| 201 | *index = i; |
| 202 | *phys = pfn * PAGE_SIZE; |
| 203 | return adr; |
| 204 | } |
| 205 | |
| 206 | static __init void unmap_low_page(int i) |
| 207 | { |
| 208 | struct temp_map *ti = &temp_mappings[i]; |
| 209 | set_pmd(ti->pmd, __pmd(0)); |
| 210 | ti->allocated = 0; |
| 211 | } |
| 212 | |
| 213 | static void __init phys_pud_init(pud_t *pud, unsigned long address, unsigned long end) |
| 214 | { |
| 215 | long i, j; |
| 216 | |
| 217 | i = pud_index(address); |
| 218 | pud = pud + i; |
| 219 | for (; i < PTRS_PER_PUD; pud++, i++) { |
| 220 | int map; |
| 221 | unsigned long paddr, pmd_phys; |
| 222 | pmd_t *pmd; |
| 223 | |
| 224 | paddr = address + i*PUD_SIZE; |
| 225 | if (paddr >= end) { |
| 226 | for (; i < PTRS_PER_PUD; i++, pud++) |
| 227 | set_pud(pud, __pud(0)); |
| 228 | break; |
| 229 | } |
| 230 | |
| 231 | if (!e820_mapped(paddr, paddr+PUD_SIZE, 0)) { |
| 232 | set_pud(pud, __pud(0)); |
| 233 | continue; |
| 234 | } |
| 235 | |
| 236 | pmd = alloc_low_page(&map, &pmd_phys); |
| 237 | set_pud(pud, __pud(pmd_phys | _KERNPG_TABLE)); |
| 238 | for (j = 0; j < PTRS_PER_PMD; pmd++, j++, paddr += PMD_SIZE) { |
| 239 | unsigned long pe; |
| 240 | |
| 241 | if (paddr >= end) { |
| 242 | for (; j < PTRS_PER_PMD; j++, pmd++) |
| 243 | set_pmd(pmd, __pmd(0)); |
| 244 | break; |
| 245 | } |
| 246 | pe = _PAGE_NX|_PAGE_PSE | _KERNPG_TABLE | _PAGE_GLOBAL | paddr; |
| 247 | pe &= __supported_pte_mask; |
| 248 | set_pmd(pmd, __pmd(pe)); |
| 249 | } |
| 250 | unmap_low_page(map); |
| 251 | } |
| 252 | __flush_tlb(); |
| 253 | } |
| 254 | |
| 255 | static void __init find_early_table_space(unsigned long end) |
| 256 | { |
| 257 | unsigned long puds, pmds, tables; |
| 258 | |
| 259 | puds = (end + PUD_SIZE - 1) >> PUD_SHIFT; |
| 260 | pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT; |
| 261 | tables = round_up(puds * sizeof(pud_t), PAGE_SIZE) + |
| 262 | round_up(pmds * sizeof(pmd_t), PAGE_SIZE); |
| 263 | |
| 264 | table_start = find_e820_area(0x8000, __pa_symbol(&_text), tables); |
| 265 | if (table_start == -1UL) |
| 266 | panic("Cannot find space for the kernel page tables"); |
| 267 | |
| 268 | table_start >>= PAGE_SHIFT; |
| 269 | table_end = table_start; |
| 270 | } |
| 271 | |
| 272 | /* Setup the direct mapping of the physical memory at PAGE_OFFSET. |
| 273 | This runs before bootmem is initialized and gets pages directly from the |
| 274 | physical memory. To access them they are temporarily mapped. */ |
| 275 | void __init init_memory_mapping(unsigned long start, unsigned long end) |
| 276 | { |
| 277 | unsigned long next; |
| 278 | |
| 279 | Dprintk("init_memory_mapping\n"); |
| 280 | |
| 281 | /* |
| 282 | * Find space for the kernel direct mapping tables. |
| 283 | * Later we should allocate these tables in the local node of the memory |
| 284 | * mapped. Unfortunately this is done currently before the nodes are |
| 285 | * discovered. |
| 286 | */ |
| 287 | find_early_table_space(end); |
| 288 | |
| 289 | start = (unsigned long)__va(start); |
| 290 | end = (unsigned long)__va(end); |
| 291 | |
| 292 | for (; start < end; start = next) { |
| 293 | int map; |
| 294 | unsigned long pud_phys; |
| 295 | pud_t *pud = alloc_low_page(&map, &pud_phys); |
| 296 | next = start + PGDIR_SIZE; |
| 297 | if (next > end) |
| 298 | next = end; |
| 299 | phys_pud_init(pud, __pa(start), __pa(next)); |
| 300 | set_pgd(pgd_offset_k(start), mk_kernel_pgd(pud_phys)); |
| 301 | unmap_low_page(map); |
| 302 | } |
| 303 | |
| 304 | asm volatile("movq %%cr4,%0" : "=r" (mmu_cr4_features)); |
| 305 | __flush_tlb_all(); |
| 306 | early_printk("kernel direct mapping tables upto %lx @ %lx-%lx\n", end, |
| 307 | table_start<<PAGE_SHIFT, |
| 308 | table_end<<PAGE_SHIFT); |
| 309 | } |
| 310 | |
| 311 | extern struct x8664_pda cpu_pda[NR_CPUS]; |
| 312 | |
| 313 | /* Assumes all CPUs still execute in init_mm */ |
| 314 | void zap_low_mappings(void) |
| 315 | { |
| 316 | pgd_t *pgd = pgd_offset_k(0UL); |
| 317 | pgd_clear(pgd); |
| 318 | flush_tlb_all(); |
| 319 | } |
| 320 | |
Matt Tolentino | 2b97690 | 2005-06-23 00:08:06 -0700 | [diff] [blame] | 321 | #ifndef CONFIG_NUMA |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | void __init paging_init(void) |
| 323 | { |
| 324 | { |
Andi Kleen | 485761b | 2005-08-26 18:34:10 -0700 | [diff] [blame^] | 325 | unsigned long zones_size[MAX_NR_ZONES]; |
| 326 | unsigned long holes[MAX_NR_ZONES]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | unsigned int max_dma; |
| 328 | |
Andi Kleen | 485761b | 2005-08-26 18:34:10 -0700 | [diff] [blame^] | 329 | memset(zones_size, 0, sizeof(zones_size)); |
| 330 | memset(holes, 0, sizeof(holes)); |
| 331 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT; |
| 333 | |
Andi Kleen | 485761b | 2005-08-26 18:34:10 -0700 | [diff] [blame^] | 334 | if (end_pfn < max_dma) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | zones_size[ZONE_DMA] = end_pfn; |
Andi Kleen | 485761b | 2005-08-26 18:34:10 -0700 | [diff] [blame^] | 336 | holes[ZONE_DMA] = e820_hole_size(0, end_pfn); |
| 337 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | zones_size[ZONE_DMA] = max_dma; |
Andi Kleen | 485761b | 2005-08-26 18:34:10 -0700 | [diff] [blame^] | 339 | holes[ZONE_DMA] = e820_hole_size(0, max_dma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | zones_size[ZONE_NORMAL] = end_pfn - max_dma; |
Andi Kleen | 485761b | 2005-08-26 18:34:10 -0700 | [diff] [blame^] | 341 | holes[ZONE_NORMAL] = e820_hole_size(max_dma, end_pfn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | } |
Andi Kleen | 485761b | 2005-08-26 18:34:10 -0700 | [diff] [blame^] | 343 | free_area_init_node(0, NODE_DATA(0), zones_size, |
| 344 | __pa(PAGE_OFFSET) >> PAGE_SHIFT, holes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | } |
| 346 | return; |
| 347 | } |
| 348 | #endif |
| 349 | |
| 350 | /* Unmap a kernel mapping if it exists. This is useful to avoid prefetches |
| 351 | from the CPU leading to inconsistent cache lines. address and size |
| 352 | must be aligned to 2MB boundaries. |
| 353 | Does nothing when the mapping doesn't exist. */ |
| 354 | void __init clear_kernel_mapping(unsigned long address, unsigned long size) |
| 355 | { |
| 356 | unsigned long end = address + size; |
| 357 | |
| 358 | BUG_ON(address & ~LARGE_PAGE_MASK); |
| 359 | BUG_ON(size & ~LARGE_PAGE_MASK); |
| 360 | |
| 361 | for (; address < end; address += LARGE_PAGE_SIZE) { |
| 362 | pgd_t *pgd = pgd_offset_k(address); |
| 363 | pud_t *pud; |
| 364 | pmd_t *pmd; |
| 365 | if (pgd_none(*pgd)) |
| 366 | continue; |
| 367 | pud = pud_offset(pgd, address); |
| 368 | if (pud_none(*pud)) |
| 369 | continue; |
| 370 | pmd = pmd_offset(pud, address); |
| 371 | if (!pmd || pmd_none(*pmd)) |
| 372 | continue; |
| 373 | if (0 == (pmd_val(*pmd) & _PAGE_PSE)) { |
| 374 | /* Could handle this, but it should not happen currently. */ |
| 375 | printk(KERN_ERR |
| 376 | "clear_kernel_mapping: mapping has been split. will leak memory\n"); |
| 377 | pmd_ERROR(*pmd); |
| 378 | } |
| 379 | set_pmd(pmd, __pmd(0)); |
| 380 | } |
| 381 | __flush_tlb_all(); |
| 382 | } |
| 383 | |
| 384 | static inline int page_is_ram (unsigned long pagenr) |
| 385 | { |
| 386 | int i; |
| 387 | |
| 388 | for (i = 0; i < e820.nr_map; i++) { |
| 389 | unsigned long addr, end; |
| 390 | |
| 391 | if (e820.map[i].type != E820_RAM) /* not usable memory */ |
| 392 | continue; |
| 393 | /* |
| 394 | * !!!FIXME!!! Some BIOSen report areas as RAM that |
| 395 | * are not. Notably the 640->1Mb area. We need a sanity |
| 396 | * check here. |
| 397 | */ |
| 398 | addr = (e820.map[i].addr+PAGE_SIZE-1) >> PAGE_SHIFT; |
| 399 | end = (e820.map[i].addr+e820.map[i].size) >> PAGE_SHIFT; |
| 400 | if ((pagenr >= addr) && (pagenr < end)) |
| 401 | return 1; |
| 402 | } |
| 403 | return 0; |
| 404 | } |
| 405 | |
| 406 | extern int swiotlb_force; |
| 407 | |
| 408 | static struct kcore_list kcore_mem, kcore_vmalloc, kcore_kernel, kcore_modules, |
| 409 | kcore_vsyscall; |
| 410 | |
| 411 | void __init mem_init(void) |
| 412 | { |
| 413 | int codesize, reservedpages, datasize, initsize; |
| 414 | int tmp; |
| 415 | |
| 416 | #ifdef CONFIG_SWIOTLB |
| 417 | if (swiotlb_force) |
| 418 | swiotlb = 1; |
| 419 | if (!iommu_aperture && |
| 420 | (end_pfn >= 0xffffffff>>PAGE_SHIFT || force_iommu)) |
| 421 | swiotlb = 1; |
| 422 | if (swiotlb) |
| 423 | swiotlb_init(); |
| 424 | #endif |
| 425 | |
| 426 | /* How many end-of-memory variables you have, grandma! */ |
| 427 | max_low_pfn = end_pfn; |
| 428 | max_pfn = end_pfn; |
| 429 | num_physpages = end_pfn; |
| 430 | high_memory = (void *) __va(end_pfn * PAGE_SIZE); |
| 431 | |
| 432 | /* clear the zero-page */ |
| 433 | memset(empty_zero_page, 0, PAGE_SIZE); |
| 434 | |
| 435 | reservedpages = 0; |
| 436 | |
| 437 | /* this will put all low memory onto the freelists */ |
Matt Tolentino | 2b97690 | 2005-06-23 00:08:06 -0700 | [diff] [blame] | 438 | #ifdef CONFIG_NUMA |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | totalram_pages += numa_free_all_bootmem(); |
| 440 | tmp = 0; |
| 441 | /* should count reserved pages here for all nodes */ |
| 442 | #else |
Matt Tolentino | 2b97690 | 2005-06-23 00:08:06 -0700 | [diff] [blame] | 443 | |
| 444 | #ifdef CONFIG_FLATMEM |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | max_mapnr = end_pfn; |
| 446 | if (!mem_map) BUG(); |
Matt Tolentino | 2b97690 | 2005-06-23 00:08:06 -0700 | [diff] [blame] | 447 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | |
| 449 | totalram_pages += free_all_bootmem(); |
| 450 | |
| 451 | for (tmp = 0; tmp < end_pfn; tmp++) |
| 452 | /* |
| 453 | * Only count reserved RAM pages |
| 454 | */ |
| 455 | if (page_is_ram(tmp) && PageReserved(pfn_to_page(tmp))) |
| 456 | reservedpages++; |
| 457 | #endif |
| 458 | |
| 459 | after_bootmem = 1; |
| 460 | |
| 461 | codesize = (unsigned long) &_etext - (unsigned long) &_text; |
| 462 | datasize = (unsigned long) &_edata - (unsigned long) &_etext; |
| 463 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; |
| 464 | |
| 465 | /* Register memory areas for /proc/kcore */ |
| 466 | kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT); |
| 467 | kclist_add(&kcore_vmalloc, (void *)VMALLOC_START, |
| 468 | VMALLOC_END-VMALLOC_START); |
| 469 | kclist_add(&kcore_kernel, &_stext, _end - _stext); |
| 470 | kclist_add(&kcore_modules, (void *)MODULES_VADDR, MODULES_LEN); |
| 471 | kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START, |
| 472 | VSYSCALL_END - VSYSCALL_START); |
| 473 | |
| 474 | printk("Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init)\n", |
| 475 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), |
| 476 | end_pfn << (PAGE_SHIFT-10), |
| 477 | codesize >> 10, |
| 478 | reservedpages << (PAGE_SHIFT-10), |
| 479 | datasize >> 10, |
| 480 | initsize >> 10); |
| 481 | |
| 482 | /* |
| 483 | * Subtle. SMP is doing its boot stuff late (because it has to |
| 484 | * fork idle threads) - but it also needs low mappings for the |
| 485 | * protected-mode entry to work. We zap these entries only after |
| 486 | * the WP-bit has been tested. |
| 487 | */ |
| 488 | #ifndef CONFIG_SMP |
| 489 | zap_low_mappings(); |
| 490 | #endif |
| 491 | } |
| 492 | |
| 493 | extern char __initdata_begin[], __initdata_end[]; |
| 494 | |
| 495 | void free_initmem(void) |
| 496 | { |
| 497 | unsigned long addr; |
| 498 | |
| 499 | addr = (unsigned long)(&__init_begin); |
| 500 | for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) { |
| 501 | ClearPageReserved(virt_to_page(addr)); |
| 502 | set_page_count(virt_to_page(addr), 1); |
| 503 | memset((void *)(addr & ~(PAGE_SIZE-1)), 0xcc, PAGE_SIZE); |
| 504 | free_page(addr); |
| 505 | totalram_pages++; |
| 506 | } |
| 507 | memset(__initdata_begin, 0xba, __initdata_end - __initdata_begin); |
| 508 | printk ("Freeing unused kernel memory: %luk freed\n", (&__init_end - &__init_begin) >> 10); |
| 509 | } |
| 510 | |
| 511 | #ifdef CONFIG_BLK_DEV_INITRD |
| 512 | void free_initrd_mem(unsigned long start, unsigned long end) |
| 513 | { |
| 514 | if (start < (unsigned long)&_end) |
| 515 | return; |
| 516 | printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); |
| 517 | for (; start < end; start += PAGE_SIZE) { |
| 518 | ClearPageReserved(virt_to_page(start)); |
| 519 | set_page_count(virt_to_page(start), 1); |
| 520 | free_page(start); |
| 521 | totalram_pages++; |
| 522 | } |
| 523 | } |
| 524 | #endif |
| 525 | |
| 526 | void __init reserve_bootmem_generic(unsigned long phys, unsigned len) |
| 527 | { |
| 528 | /* Should check here against the e820 map to avoid double free */ |
Matt Tolentino | 2b97690 | 2005-06-23 00:08:06 -0700 | [diff] [blame] | 529 | #ifdef CONFIG_NUMA |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | int nid = phys_to_nid(phys); |
| 531 | reserve_bootmem_node(NODE_DATA(nid), phys, len); |
| 532 | #else |
| 533 | reserve_bootmem(phys, len); |
| 534 | #endif |
| 535 | } |
| 536 | |
| 537 | int kern_addr_valid(unsigned long addr) |
| 538 | { |
| 539 | unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT; |
| 540 | pgd_t *pgd; |
| 541 | pud_t *pud; |
| 542 | pmd_t *pmd; |
| 543 | pte_t *pte; |
| 544 | |
| 545 | if (above != 0 && above != -1UL) |
| 546 | return 0; |
| 547 | |
| 548 | pgd = pgd_offset_k(addr); |
| 549 | if (pgd_none(*pgd)) |
| 550 | return 0; |
| 551 | |
| 552 | pud = pud_offset(pgd, addr); |
| 553 | if (pud_none(*pud)) |
| 554 | return 0; |
| 555 | |
| 556 | pmd = pmd_offset(pud, addr); |
| 557 | if (pmd_none(*pmd)) |
| 558 | return 0; |
| 559 | if (pmd_large(*pmd)) |
| 560 | return pfn_valid(pmd_pfn(*pmd)); |
| 561 | |
| 562 | pte = pte_offset_kernel(pmd, addr); |
| 563 | if (pte_none(*pte)) |
| 564 | return 0; |
| 565 | return pfn_valid(pte_pfn(*pte)); |
| 566 | } |
| 567 | |
| 568 | #ifdef CONFIG_SYSCTL |
| 569 | #include <linux/sysctl.h> |
| 570 | |
| 571 | extern int exception_trace, page_fault_trace; |
| 572 | |
| 573 | static ctl_table debug_table2[] = { |
| 574 | { 99, "exception-trace", &exception_trace, sizeof(int), 0644, NULL, |
| 575 | proc_dointvec }, |
| 576 | #ifdef CONFIG_CHECKING |
| 577 | { 100, "page-fault-trace", &page_fault_trace, sizeof(int), 0644, NULL, |
| 578 | proc_dointvec }, |
| 579 | #endif |
| 580 | { 0, } |
| 581 | }; |
| 582 | |
| 583 | static ctl_table debug_root_table2[] = { |
| 584 | { .ctl_name = CTL_DEBUG, .procname = "debug", .mode = 0555, |
| 585 | .child = debug_table2 }, |
| 586 | { 0 }, |
| 587 | }; |
| 588 | |
| 589 | static __init int x8664_sysctl_init(void) |
| 590 | { |
| 591 | register_sysctl_table(debug_root_table2, 1); |
| 592 | return 0; |
| 593 | } |
| 594 | __initcall(x8664_sysctl_init); |
| 595 | #endif |
| 596 | |
Andi Kleen | 1e01441 | 2005-04-16 15:24:55 -0700 | [diff] [blame] | 597 | /* A pseudo VMAs to allow ptrace access for the vsyscall page. This only |
| 598 | covers the 64bit vsyscall page now. 32bit has a real VMA now and does |
| 599 | not need special handling anymore. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | |
| 601 | static struct vm_area_struct gate_vma = { |
| 602 | .vm_start = VSYSCALL_START, |
| 603 | .vm_end = VSYSCALL_END, |
| 604 | .vm_page_prot = PAGE_READONLY |
| 605 | }; |
| 606 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | struct vm_area_struct *get_gate_vma(struct task_struct *tsk) |
| 608 | { |
| 609 | #ifdef CONFIG_IA32_EMULATION |
Andi Kleen | 1e01441 | 2005-04-16 15:24:55 -0700 | [diff] [blame] | 610 | if (test_tsk_thread_flag(tsk, TIF_IA32)) |
| 611 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | #endif |
| 613 | return &gate_vma; |
| 614 | } |
| 615 | |
| 616 | int in_gate_area(struct task_struct *task, unsigned long addr) |
| 617 | { |
| 618 | struct vm_area_struct *vma = get_gate_vma(task); |
Andi Kleen | 1e01441 | 2005-04-16 15:24:55 -0700 | [diff] [blame] | 619 | if (!vma) |
| 620 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | return (addr >= vma->vm_start) && (addr < vma->vm_end); |
| 622 | } |
| 623 | |
| 624 | /* Use this when you have no reliable task/vma, typically from interrupt |
| 625 | * context. It is less reliable than using the task's vma and may give |
| 626 | * false positives. |
| 627 | */ |
| 628 | int in_gate_area_no_task(unsigned long addr) |
| 629 | { |
Andi Kleen | 1e01441 | 2005-04-16 15:24:55 -0700 | [diff] [blame] | 630 | return (addr >= VSYSCALL_START) && (addr < VSYSCALL_END); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | } |