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1da177e4 LT |
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> | |
2bc0414e | 39 | #include <asm/sections.h> |
1da177e4 LT |
40 | |
41 | #ifndef Dprintk | |
42 | #define Dprintk(x...) | |
43 | #endif | |
44 | ||
45 | #ifdef CONFIG_GART_IOMMU | |
46 | extern int swiotlb; | |
47 | #endif | |
48 | ||
e18c6874 AK |
49 | static unsigned long dma_reserve __initdata; |
50 | ||
1da177e4 LT |
51 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); |
52 | ||
53 | /* | |
54 | * NOTE: pagetable_init alloc all the fixmap pagetables contiguous on the | |
55 | * physical space so we can cache the place of the first one and move | |
56 | * around without checking the pgd every time. | |
57 | */ | |
58 | ||
59 | void show_mem(void) | |
60 | { | |
e92343cc AK |
61 | long i, total = 0, reserved = 0; |
62 | long shared = 0, cached = 0; | |
1da177e4 LT |
63 | pg_data_t *pgdat; |
64 | struct page *page; | |
65 | ||
e92343cc | 66 | printk(KERN_INFO "Mem-info:\n"); |
1da177e4 | 67 | show_free_areas(); |
e92343cc | 68 | printk(KERN_INFO "Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); |
1da177e4 LT |
69 | |
70 | for_each_pgdat(pgdat) { | |
71 | for (i = 0; i < pgdat->node_spanned_pages; ++i) { | |
72 | page = pfn_to_page(pgdat->node_start_pfn + i); | |
73 | total++; | |
e92343cc AK |
74 | if (PageReserved(page)) |
75 | reserved++; | |
76 | else if (PageSwapCache(page)) | |
77 | cached++; | |
78 | else if (page_count(page)) | |
79 | shared += page_count(page) - 1; | |
1da177e4 LT |
80 | } |
81 | } | |
e92343cc AK |
82 | printk(KERN_INFO "%lu pages of RAM\n", total); |
83 | printk(KERN_INFO "%lu reserved pages\n",reserved); | |
84 | printk(KERN_INFO "%lu pages shared\n",shared); | |
85 | printk(KERN_INFO "%lu pages swap cached\n",cached); | |
1da177e4 LT |
86 | } |
87 | ||
88 | /* References to section boundaries */ | |
89 | ||
1da177e4 LT |
90 | int after_bootmem; |
91 | ||
92 | static void *spp_getpage(void) | |
93 | { | |
94 | void *ptr; | |
95 | if (after_bootmem) | |
96 | ptr = (void *) get_zeroed_page(GFP_ATOMIC); | |
97 | else | |
98 | ptr = alloc_bootmem_pages(PAGE_SIZE); | |
99 | if (!ptr || ((unsigned long)ptr & ~PAGE_MASK)) | |
100 | panic("set_pte_phys: cannot allocate page data %s\n", after_bootmem?"after bootmem":""); | |
101 | ||
102 | Dprintk("spp_getpage %p\n", ptr); | |
103 | return ptr; | |
104 | } | |
105 | ||
106 | static void set_pte_phys(unsigned long vaddr, | |
107 | unsigned long phys, pgprot_t prot) | |
108 | { | |
109 | pgd_t *pgd; | |
110 | pud_t *pud; | |
111 | pmd_t *pmd; | |
112 | pte_t *pte, new_pte; | |
113 | ||
114 | Dprintk("set_pte_phys %lx to %lx\n", vaddr, phys); | |
115 | ||
116 | pgd = pgd_offset_k(vaddr); | |
117 | if (pgd_none(*pgd)) { | |
118 | printk("PGD FIXMAP MISSING, it should be setup in head.S!\n"); | |
119 | return; | |
120 | } | |
121 | pud = pud_offset(pgd, vaddr); | |
122 | if (pud_none(*pud)) { | |
123 | pmd = (pmd_t *) spp_getpage(); | |
124 | set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE | _PAGE_USER)); | |
125 | if (pmd != pmd_offset(pud, 0)) { | |
126 | printk("PAGETABLE BUG #01! %p <-> %p\n", pmd, pmd_offset(pud,0)); | |
127 | return; | |
128 | } | |
129 | } | |
130 | pmd = pmd_offset(pud, vaddr); | |
131 | if (pmd_none(*pmd)) { | |
132 | pte = (pte_t *) spp_getpage(); | |
133 | set_pmd(pmd, __pmd(__pa(pte) | _KERNPG_TABLE | _PAGE_USER)); | |
134 | if (pte != pte_offset_kernel(pmd, 0)) { | |
135 | printk("PAGETABLE BUG #02!\n"); | |
136 | return; | |
137 | } | |
138 | } | |
139 | new_pte = pfn_pte(phys >> PAGE_SHIFT, prot); | |
140 | ||
141 | pte = pte_offset_kernel(pmd, vaddr); | |
142 | if (!pte_none(*pte) && | |
143 | pte_val(*pte) != (pte_val(new_pte) & __supported_pte_mask)) | |
144 | pte_ERROR(*pte); | |
145 | set_pte(pte, new_pte); | |
146 | ||
147 | /* | |
148 | * It's enough to flush this one mapping. | |
149 | * (PGE mappings get flushed as well) | |
150 | */ | |
151 | __flush_tlb_one(vaddr); | |
152 | } | |
153 | ||
154 | /* NOTE: this is meant to be run only at boot */ | |
155 | void __set_fixmap (enum fixed_addresses idx, unsigned long phys, pgprot_t prot) | |
156 | { | |
157 | unsigned long address = __fix_to_virt(idx); | |
158 | ||
159 | if (idx >= __end_of_fixed_addresses) { | |
160 | printk("Invalid __set_fixmap\n"); | |
161 | return; | |
162 | } | |
163 | set_pte_phys(address, phys, prot); | |
164 | } | |
165 | ||
166 | unsigned long __initdata table_start, table_end; | |
167 | ||
168 | extern pmd_t temp_boot_pmds[]; | |
169 | ||
170 | static struct temp_map { | |
171 | pmd_t *pmd; | |
172 | void *address; | |
173 | int allocated; | |
174 | } temp_mappings[] __initdata = { | |
175 | { &temp_boot_pmds[0], (void *)(40UL * 1024 * 1024) }, | |
176 | { &temp_boot_pmds[1], (void *)(42UL * 1024 * 1024) }, | |
177 | {} | |
178 | }; | |
179 | ||
180 | static __init void *alloc_low_page(int *index, unsigned long *phys) | |
181 | { | |
182 | struct temp_map *ti; | |
183 | int i; | |
184 | unsigned long pfn = table_end++, paddr; | |
185 | void *adr; | |
186 | ||
187 | if (pfn >= end_pfn) | |
188 | panic("alloc_low_page: ran out of memory"); | |
189 | for (i = 0; temp_mappings[i].allocated; i++) { | |
190 | if (!temp_mappings[i].pmd) | |
191 | panic("alloc_low_page: ran out of temp mappings"); | |
192 | } | |
193 | ti = &temp_mappings[i]; | |
194 | paddr = (pfn << PAGE_SHIFT) & PMD_MASK; | |
195 | set_pmd(ti->pmd, __pmd(paddr | _KERNPG_TABLE | _PAGE_PSE)); | |
196 | ti->allocated = 1; | |
197 | __flush_tlb(); | |
198 | adr = ti->address + ((pfn << PAGE_SHIFT) & ~PMD_MASK); | |
199 | *index = i; | |
200 | *phys = pfn * PAGE_SIZE; | |
201 | return adr; | |
202 | } | |
203 | ||
204 | static __init void unmap_low_page(int i) | |
205 | { | |
206 | struct temp_map *ti = &temp_mappings[i]; | |
207 | set_pmd(ti->pmd, __pmd(0)); | |
208 | ti->allocated = 0; | |
209 | } | |
210 | ||
211 | static void __init phys_pud_init(pud_t *pud, unsigned long address, unsigned long end) | |
212 | { | |
213 | long i, j; | |
214 | ||
215 | i = pud_index(address); | |
216 | pud = pud + i; | |
217 | for (; i < PTRS_PER_PUD; pud++, i++) { | |
218 | int map; | |
219 | unsigned long paddr, pmd_phys; | |
220 | pmd_t *pmd; | |
221 | ||
222 | paddr = address + i*PUD_SIZE; | |
223 | if (paddr >= end) { | |
224 | for (; i < PTRS_PER_PUD; i++, pud++) | |
225 | set_pud(pud, __pud(0)); | |
226 | break; | |
227 | } | |
228 | ||
229 | if (!e820_mapped(paddr, paddr+PUD_SIZE, 0)) { | |
230 | set_pud(pud, __pud(0)); | |
231 | continue; | |
232 | } | |
233 | ||
234 | pmd = alloc_low_page(&map, &pmd_phys); | |
235 | set_pud(pud, __pud(pmd_phys | _KERNPG_TABLE)); | |
236 | for (j = 0; j < PTRS_PER_PMD; pmd++, j++, paddr += PMD_SIZE) { | |
237 | unsigned long pe; | |
238 | ||
239 | if (paddr >= end) { | |
240 | for (; j < PTRS_PER_PMD; j++, pmd++) | |
241 | set_pmd(pmd, __pmd(0)); | |
242 | break; | |
243 | } | |
244 | pe = _PAGE_NX|_PAGE_PSE | _KERNPG_TABLE | _PAGE_GLOBAL | paddr; | |
245 | pe &= __supported_pte_mask; | |
246 | set_pmd(pmd, __pmd(pe)); | |
247 | } | |
248 | unmap_low_page(map); | |
249 | } | |
250 | __flush_tlb(); | |
251 | } | |
252 | ||
253 | static void __init find_early_table_space(unsigned long end) | |
254 | { | |
255 | unsigned long puds, pmds, tables; | |
256 | ||
257 | puds = (end + PUD_SIZE - 1) >> PUD_SHIFT; | |
258 | pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT; | |
259 | tables = round_up(puds * sizeof(pud_t), PAGE_SIZE) + | |
260 | round_up(pmds * sizeof(pmd_t), PAGE_SIZE); | |
261 | ||
262 | table_start = find_e820_area(0x8000, __pa_symbol(&_text), tables); | |
263 | if (table_start == -1UL) | |
264 | panic("Cannot find space for the kernel page tables"); | |
265 | ||
266 | table_start >>= PAGE_SHIFT; | |
267 | table_end = table_start; | |
268 | } | |
269 | ||
270 | /* Setup the direct mapping of the physical memory at PAGE_OFFSET. | |
271 | This runs before bootmem is initialized and gets pages directly from the | |
272 | physical memory. To access them they are temporarily mapped. */ | |
273 | void __init init_memory_mapping(unsigned long start, unsigned long end) | |
274 | { | |
275 | unsigned long next; | |
276 | ||
277 | Dprintk("init_memory_mapping\n"); | |
278 | ||
279 | /* | |
280 | * Find space for the kernel direct mapping tables. | |
281 | * Later we should allocate these tables in the local node of the memory | |
282 | * mapped. Unfortunately this is done currently before the nodes are | |
283 | * discovered. | |
284 | */ | |
285 | find_early_table_space(end); | |
286 | ||
287 | start = (unsigned long)__va(start); | |
288 | end = (unsigned long)__va(end); | |
289 | ||
290 | for (; start < end; start = next) { | |
291 | int map; | |
292 | unsigned long pud_phys; | |
293 | pud_t *pud = alloc_low_page(&map, &pud_phys); | |
294 | next = start + PGDIR_SIZE; | |
295 | if (next > end) | |
296 | next = end; | |
297 | phys_pud_init(pud, __pa(start), __pa(next)); | |
298 | set_pgd(pgd_offset_k(start), mk_kernel_pgd(pud_phys)); | |
299 | unmap_low_page(map); | |
300 | } | |
301 | ||
302 | asm volatile("movq %%cr4,%0" : "=r" (mmu_cr4_features)); | |
303 | __flush_tlb_all(); | |
304 | early_printk("kernel direct mapping tables upto %lx @ %lx-%lx\n", end, | |
305 | table_start<<PAGE_SHIFT, | |
306 | table_end<<PAGE_SHIFT); | |
307 | } | |
308 | ||
f6c2e333 | 309 | void __cpuinit zap_low_mappings(int cpu) |
1da177e4 | 310 | { |
f6c2e333 SS |
311 | if (cpu == 0) { |
312 | pgd_t *pgd = pgd_offset_k(0UL); | |
313 | pgd_clear(pgd); | |
314 | } else { | |
315 | /* | |
316 | * For AP's, zap the low identity mappings by changing the cr3 | |
317 | * to init_level4_pgt and doing local flush tlb all | |
318 | */ | |
319 | asm volatile("movq %0,%%cr3" :: "r" (__pa_symbol(&init_level4_pgt))); | |
320 | } | |
321 | __flush_tlb_all(); | |
1da177e4 LT |
322 | } |
323 | ||
a2f1b424 AK |
324 | /* Compute zone sizes for the DMA and DMA32 zones in a node. */ |
325 | __init void | |
326 | size_zones(unsigned long *z, unsigned long *h, | |
327 | unsigned long start_pfn, unsigned long end_pfn) | |
328 | { | |
329 | int i; | |
330 | unsigned long w; | |
331 | ||
332 | for (i = 0; i < MAX_NR_ZONES; i++) | |
333 | z[i] = 0; | |
334 | ||
335 | if (start_pfn < MAX_DMA_PFN) | |
336 | z[ZONE_DMA] = MAX_DMA_PFN - start_pfn; | |
337 | if (start_pfn < MAX_DMA32_PFN) { | |
338 | unsigned long dma32_pfn = MAX_DMA32_PFN; | |
339 | if (dma32_pfn > end_pfn) | |
340 | dma32_pfn = end_pfn; | |
341 | z[ZONE_DMA32] = dma32_pfn - start_pfn; | |
342 | } | |
343 | z[ZONE_NORMAL] = end_pfn - start_pfn; | |
344 | ||
345 | /* Remove lower zones from higher ones. */ | |
346 | w = 0; | |
347 | for (i = 0; i < MAX_NR_ZONES; i++) { | |
348 | if (z[i]) | |
349 | z[i] -= w; | |
350 | w += z[i]; | |
351 | } | |
352 | ||
353 | /* Compute holes */ | |
354 | w = 0; | |
355 | for (i = 0; i < MAX_NR_ZONES; i++) { | |
356 | unsigned long s = w; | |
357 | w += z[i]; | |
358 | h[i] = e820_hole_size(s, w); | |
359 | } | |
e18c6874 AK |
360 | |
361 | /* Add the space pace needed for mem_map to the holes too. */ | |
362 | for (i = 0; i < MAX_NR_ZONES; i++) | |
363 | h[i] += (z[i] * sizeof(struct page)) / PAGE_SIZE; | |
364 | ||
365 | /* The 16MB DMA zone has the kernel and other misc mappings. | |
366 | Account them too */ | |
367 | if (h[ZONE_DMA]) { | |
368 | h[ZONE_DMA] += dma_reserve; | |
369 | if (h[ZONE_DMA] >= z[ZONE_DMA]) { | |
370 | printk(KERN_WARNING | |
371 | "Kernel too large and filling up ZONE_DMA?\n"); | |
372 | h[ZONE_DMA] = z[ZONE_DMA]; | |
373 | } | |
374 | } | |
a2f1b424 AK |
375 | } |
376 | ||
2b97690f | 377 | #ifndef CONFIG_NUMA |
1da177e4 LT |
378 | void __init paging_init(void) |
379 | { | |
a2f1b424 AK |
380 | unsigned long zones[MAX_NR_ZONES], holes[MAX_NR_ZONES]; |
381 | size_zones(zones, holes, 0, end_pfn); | |
382 | free_area_init_node(0, NODE_DATA(0), zones, | |
383 | __pa(PAGE_OFFSET) >> PAGE_SHIFT, holes); | |
1da177e4 LT |
384 | } |
385 | #endif | |
386 | ||
387 | /* Unmap a kernel mapping if it exists. This is useful to avoid prefetches | |
388 | from the CPU leading to inconsistent cache lines. address and size | |
389 | must be aligned to 2MB boundaries. | |
390 | Does nothing when the mapping doesn't exist. */ | |
391 | void __init clear_kernel_mapping(unsigned long address, unsigned long size) | |
392 | { | |
393 | unsigned long end = address + size; | |
394 | ||
395 | BUG_ON(address & ~LARGE_PAGE_MASK); | |
396 | BUG_ON(size & ~LARGE_PAGE_MASK); | |
397 | ||
398 | for (; address < end; address += LARGE_PAGE_SIZE) { | |
399 | pgd_t *pgd = pgd_offset_k(address); | |
400 | pud_t *pud; | |
401 | pmd_t *pmd; | |
402 | if (pgd_none(*pgd)) | |
403 | continue; | |
404 | pud = pud_offset(pgd, address); | |
405 | if (pud_none(*pud)) | |
406 | continue; | |
407 | pmd = pmd_offset(pud, address); | |
408 | if (!pmd || pmd_none(*pmd)) | |
409 | continue; | |
410 | if (0 == (pmd_val(*pmd) & _PAGE_PSE)) { | |
411 | /* Could handle this, but it should not happen currently. */ | |
412 | printk(KERN_ERR | |
413 | "clear_kernel_mapping: mapping has been split. will leak memory\n"); | |
414 | pmd_ERROR(*pmd); | |
415 | } | |
416 | set_pmd(pmd, __pmd(0)); | |
417 | } | |
418 | __flush_tlb_all(); | |
419 | } | |
420 | ||
1da177e4 LT |
421 | static struct kcore_list kcore_mem, kcore_vmalloc, kcore_kernel, kcore_modules, |
422 | kcore_vsyscall; | |
423 | ||
424 | void __init mem_init(void) | |
425 | { | |
0a43e4bf | 426 | long codesize, reservedpages, datasize, initsize; |
1da177e4 LT |
427 | |
428 | #ifdef CONFIG_SWIOTLB | |
1da177e4 LT |
429 | if (!iommu_aperture && |
430 | (end_pfn >= 0xffffffff>>PAGE_SHIFT || force_iommu)) | |
431 | swiotlb = 1; | |
432 | if (swiotlb) | |
433 | swiotlb_init(); | |
434 | #endif | |
435 | ||
436 | /* How many end-of-memory variables you have, grandma! */ | |
437 | max_low_pfn = end_pfn; | |
438 | max_pfn = end_pfn; | |
439 | num_physpages = end_pfn; | |
440 | high_memory = (void *) __va(end_pfn * PAGE_SIZE); | |
441 | ||
442 | /* clear the zero-page */ | |
443 | memset(empty_zero_page, 0, PAGE_SIZE); | |
444 | ||
445 | reservedpages = 0; | |
446 | ||
447 | /* this will put all low memory onto the freelists */ | |
2b97690f | 448 | #ifdef CONFIG_NUMA |
0a43e4bf | 449 | totalram_pages = numa_free_all_bootmem(); |
1da177e4 | 450 | #else |
0a43e4bf | 451 | totalram_pages = free_all_bootmem(); |
1da177e4 | 452 | #endif |
0a43e4bf | 453 | reservedpages = end_pfn - totalram_pages - e820_hole_size(0, end_pfn); |
1da177e4 LT |
454 | |
455 | after_bootmem = 1; | |
456 | ||
457 | codesize = (unsigned long) &_etext - (unsigned long) &_text; | |
458 | datasize = (unsigned long) &_edata - (unsigned long) &_etext; | |
459 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; | |
460 | ||
461 | /* Register memory areas for /proc/kcore */ | |
462 | kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT); | |
463 | kclist_add(&kcore_vmalloc, (void *)VMALLOC_START, | |
464 | VMALLOC_END-VMALLOC_START); | |
465 | kclist_add(&kcore_kernel, &_stext, _end - _stext); | |
466 | kclist_add(&kcore_modules, (void *)MODULES_VADDR, MODULES_LEN); | |
467 | kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START, | |
468 | VSYSCALL_END - VSYSCALL_START); | |
469 | ||
0a43e4bf | 470 | printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n", |
1da177e4 LT |
471 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), |
472 | end_pfn << (PAGE_SHIFT-10), | |
473 | codesize >> 10, | |
474 | reservedpages << (PAGE_SHIFT-10), | |
475 | datasize >> 10, | |
476 | initsize >> 10); | |
477 | ||
f6c2e333 | 478 | #ifdef CONFIG_SMP |
1da177e4 | 479 | /* |
f6c2e333 SS |
480 | * Sync boot_level4_pgt mappings with the init_level4_pgt |
481 | * except for the low identity mappings which are already zapped | |
482 | * in init_level4_pgt. This sync-up is essential for AP's bringup | |
1da177e4 | 483 | */ |
f6c2e333 | 484 | memcpy(boot_level4_pgt+1, init_level4_pgt+1, (PTRS_PER_PGD-1)*sizeof(pgd_t)); |
1da177e4 LT |
485 | #endif |
486 | } | |
487 | ||
1da177e4 LT |
488 | void free_initmem(void) |
489 | { | |
490 | unsigned long addr; | |
491 | ||
492 | addr = (unsigned long)(&__init_begin); | |
493 | for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) { | |
494 | ClearPageReserved(virt_to_page(addr)); | |
495 | set_page_count(virt_to_page(addr), 1); | |
496 | memset((void *)(addr & ~(PAGE_SIZE-1)), 0xcc, PAGE_SIZE); | |
497 | free_page(addr); | |
498 | totalram_pages++; | |
499 | } | |
500 | memset(__initdata_begin, 0xba, __initdata_end - __initdata_begin); | |
2bc0414e | 501 | printk ("Freeing unused kernel memory: %luk freed\n", (__init_end - __init_begin) >> 10); |
1da177e4 LT |
502 | } |
503 | ||
504 | #ifdef CONFIG_BLK_DEV_INITRD | |
505 | void free_initrd_mem(unsigned long start, unsigned long end) | |
506 | { | |
507 | if (start < (unsigned long)&_end) | |
508 | return; | |
509 | printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); | |
510 | for (; start < end; start += PAGE_SIZE) { | |
511 | ClearPageReserved(virt_to_page(start)); | |
512 | set_page_count(virt_to_page(start), 1); | |
513 | free_page(start); | |
514 | totalram_pages++; | |
515 | } | |
516 | } | |
517 | #endif | |
518 | ||
519 | void __init reserve_bootmem_generic(unsigned long phys, unsigned len) | |
520 | { | |
521 | /* Should check here against the e820 map to avoid double free */ | |
2b97690f | 522 | #ifdef CONFIG_NUMA |
1da177e4 LT |
523 | int nid = phys_to_nid(phys); |
524 | reserve_bootmem_node(NODE_DATA(nid), phys, len); | |
525 | #else | |
526 | reserve_bootmem(phys, len); | |
527 | #endif | |
e18c6874 AK |
528 | if (phys+len <= MAX_DMA_PFN*PAGE_SIZE) |
529 | dma_reserve += len / PAGE_SIZE; | |
1da177e4 LT |
530 | } |
531 | ||
532 | int kern_addr_valid(unsigned long addr) | |
533 | { | |
534 | unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT; | |
535 | pgd_t *pgd; | |
536 | pud_t *pud; | |
537 | pmd_t *pmd; | |
538 | pte_t *pte; | |
539 | ||
540 | if (above != 0 && above != -1UL) | |
541 | return 0; | |
542 | ||
543 | pgd = pgd_offset_k(addr); | |
544 | if (pgd_none(*pgd)) | |
545 | return 0; | |
546 | ||
547 | pud = pud_offset(pgd, addr); | |
548 | if (pud_none(*pud)) | |
549 | return 0; | |
550 | ||
551 | pmd = pmd_offset(pud, addr); | |
552 | if (pmd_none(*pmd)) | |
553 | return 0; | |
554 | if (pmd_large(*pmd)) | |
555 | return pfn_valid(pmd_pfn(*pmd)); | |
556 | ||
557 | pte = pte_offset_kernel(pmd, addr); | |
558 | if (pte_none(*pte)) | |
559 | return 0; | |
560 | return pfn_valid(pte_pfn(*pte)); | |
561 | } | |
562 | ||
563 | #ifdef CONFIG_SYSCTL | |
564 | #include <linux/sysctl.h> | |
565 | ||
566 | extern int exception_trace, page_fault_trace; | |
567 | ||
568 | static ctl_table debug_table2[] = { | |
569 | { 99, "exception-trace", &exception_trace, sizeof(int), 0644, NULL, | |
570 | proc_dointvec }, | |
571 | #ifdef CONFIG_CHECKING | |
572 | { 100, "page-fault-trace", &page_fault_trace, sizeof(int), 0644, NULL, | |
573 | proc_dointvec }, | |
574 | #endif | |
575 | { 0, } | |
576 | }; | |
577 | ||
578 | static ctl_table debug_root_table2[] = { | |
579 | { .ctl_name = CTL_DEBUG, .procname = "debug", .mode = 0555, | |
580 | .child = debug_table2 }, | |
581 | { 0 }, | |
582 | }; | |
583 | ||
584 | static __init int x8664_sysctl_init(void) | |
585 | { | |
586 | register_sysctl_table(debug_root_table2, 1); | |
587 | return 0; | |
588 | } | |
589 | __initcall(x8664_sysctl_init); | |
590 | #endif | |
591 | ||
1e014410 AK |
592 | /* A pseudo VMAs to allow ptrace access for the vsyscall page. This only |
593 | covers the 64bit vsyscall page now. 32bit has a real VMA now and does | |
594 | not need special handling anymore. */ | |
1da177e4 LT |
595 | |
596 | static struct vm_area_struct gate_vma = { | |
597 | .vm_start = VSYSCALL_START, | |
598 | .vm_end = VSYSCALL_END, | |
599 | .vm_page_prot = PAGE_READONLY | |
600 | }; | |
601 | ||
1da177e4 LT |
602 | struct vm_area_struct *get_gate_vma(struct task_struct *tsk) |
603 | { | |
604 | #ifdef CONFIG_IA32_EMULATION | |
1e014410 AK |
605 | if (test_tsk_thread_flag(tsk, TIF_IA32)) |
606 | return NULL; | |
1da177e4 LT |
607 | #endif |
608 | return &gate_vma; | |
609 | } | |
610 | ||
611 | int in_gate_area(struct task_struct *task, unsigned long addr) | |
612 | { | |
613 | struct vm_area_struct *vma = get_gate_vma(task); | |
1e014410 AK |
614 | if (!vma) |
615 | return 0; | |
1da177e4 LT |
616 | return (addr >= vma->vm_start) && (addr < vma->vm_end); |
617 | } | |
618 | ||
619 | /* Use this when you have no reliable task/vma, typically from interrupt | |
620 | * context. It is less reliable than using the task's vma and may give | |
621 | * false positives. | |
622 | */ | |
623 | int in_gate_area_no_task(unsigned long addr) | |
624 | { | |
1e014410 | 625 | return (addr >= VSYSCALL_START) && (addr < VSYSCALL_END); |
1da177e4 | 626 | } |