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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> | |
59170891 | 25 | #include <linux/pci.h> |
1da177e4 LT |
26 | |
27 | #include <asm/processor.h> | |
28 | #include <asm/system.h> | |
29 | #include <asm/uaccess.h> | |
30 | #include <asm/pgtable.h> | |
31 | #include <asm/pgalloc.h> | |
32 | #include <asm/dma.h> | |
33 | #include <asm/fixmap.h> | |
34 | #include <asm/e820.h> | |
35 | #include <asm/apic.h> | |
36 | #include <asm/tlb.h> | |
37 | #include <asm/mmu_context.h> | |
38 | #include <asm/proto.h> | |
39 | #include <asm/smp.h> | |
2bc0414e | 40 | #include <asm/sections.h> |
1da177e4 LT |
41 | |
42 | #ifndef Dprintk | |
43 | #define Dprintk(x...) | |
44 | #endif | |
45 | ||
e18c6874 AK |
46 | static unsigned long dma_reserve __initdata; |
47 | ||
1da177e4 LT |
48 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); |
49 | ||
50 | /* | |
51 | * NOTE: pagetable_init alloc all the fixmap pagetables contiguous on the | |
52 | * physical space so we can cache the place of the first one and move | |
53 | * around without checking the pgd every time. | |
54 | */ | |
55 | ||
56 | void show_mem(void) | |
57 | { | |
e92343cc AK |
58 | long i, total = 0, reserved = 0; |
59 | long shared = 0, cached = 0; | |
1da177e4 LT |
60 | pg_data_t *pgdat; |
61 | struct page *page; | |
62 | ||
e92343cc | 63 | printk(KERN_INFO "Mem-info:\n"); |
1da177e4 | 64 | show_free_areas(); |
e92343cc | 65 | printk(KERN_INFO "Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); |
1da177e4 LT |
66 | |
67 | for_each_pgdat(pgdat) { | |
68 | for (i = 0; i < pgdat->node_spanned_pages; ++i) { | |
69 | page = pfn_to_page(pgdat->node_start_pfn + i); | |
70 | total++; | |
e92343cc AK |
71 | if (PageReserved(page)) |
72 | reserved++; | |
73 | else if (PageSwapCache(page)) | |
74 | cached++; | |
75 | else if (page_count(page)) | |
76 | shared += page_count(page) - 1; | |
1da177e4 LT |
77 | } |
78 | } | |
e92343cc AK |
79 | printk(KERN_INFO "%lu pages of RAM\n", total); |
80 | printk(KERN_INFO "%lu reserved pages\n",reserved); | |
81 | printk(KERN_INFO "%lu pages shared\n",shared); | |
82 | printk(KERN_INFO "%lu pages swap cached\n",cached); | |
1da177e4 LT |
83 | } |
84 | ||
85 | /* References to section boundaries */ | |
86 | ||
1da177e4 LT |
87 | int after_bootmem; |
88 | ||
89 | static void *spp_getpage(void) | |
90 | { | |
91 | void *ptr; | |
92 | if (after_bootmem) | |
93 | ptr = (void *) get_zeroed_page(GFP_ATOMIC); | |
94 | else | |
95 | ptr = alloc_bootmem_pages(PAGE_SIZE); | |
96 | if (!ptr || ((unsigned long)ptr & ~PAGE_MASK)) | |
97 | panic("set_pte_phys: cannot allocate page data %s\n", after_bootmem?"after bootmem":""); | |
98 | ||
99 | Dprintk("spp_getpage %p\n", ptr); | |
100 | return ptr; | |
101 | } | |
102 | ||
103 | static void set_pte_phys(unsigned long vaddr, | |
104 | unsigned long phys, pgprot_t prot) | |
105 | { | |
106 | pgd_t *pgd; | |
107 | pud_t *pud; | |
108 | pmd_t *pmd; | |
109 | pte_t *pte, new_pte; | |
110 | ||
111 | Dprintk("set_pte_phys %lx to %lx\n", vaddr, phys); | |
112 | ||
113 | pgd = pgd_offset_k(vaddr); | |
114 | if (pgd_none(*pgd)) { | |
115 | printk("PGD FIXMAP MISSING, it should be setup in head.S!\n"); | |
116 | return; | |
117 | } | |
118 | pud = pud_offset(pgd, vaddr); | |
119 | if (pud_none(*pud)) { | |
120 | pmd = (pmd_t *) spp_getpage(); | |
121 | set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE | _PAGE_USER)); | |
122 | if (pmd != pmd_offset(pud, 0)) { | |
123 | printk("PAGETABLE BUG #01! %p <-> %p\n", pmd, pmd_offset(pud,0)); | |
124 | return; | |
125 | } | |
126 | } | |
127 | pmd = pmd_offset(pud, vaddr); | |
128 | if (pmd_none(*pmd)) { | |
129 | pte = (pte_t *) spp_getpage(); | |
130 | set_pmd(pmd, __pmd(__pa(pte) | _KERNPG_TABLE | _PAGE_USER)); | |
131 | if (pte != pte_offset_kernel(pmd, 0)) { | |
132 | printk("PAGETABLE BUG #02!\n"); | |
133 | return; | |
134 | } | |
135 | } | |
136 | new_pte = pfn_pte(phys >> PAGE_SHIFT, prot); | |
137 | ||
138 | pte = pte_offset_kernel(pmd, vaddr); | |
139 | if (!pte_none(*pte) && | |
140 | pte_val(*pte) != (pte_val(new_pte) & __supported_pte_mask)) | |
141 | pte_ERROR(*pte); | |
142 | set_pte(pte, new_pte); | |
143 | ||
144 | /* | |
145 | * It's enough to flush this one mapping. | |
146 | * (PGE mappings get flushed as well) | |
147 | */ | |
148 | __flush_tlb_one(vaddr); | |
149 | } | |
150 | ||
151 | /* NOTE: this is meant to be run only at boot */ | |
152 | void __set_fixmap (enum fixed_addresses idx, unsigned long phys, pgprot_t prot) | |
153 | { | |
154 | unsigned long address = __fix_to_virt(idx); | |
155 | ||
156 | if (idx >= __end_of_fixed_addresses) { | |
157 | printk("Invalid __set_fixmap\n"); | |
158 | return; | |
159 | } | |
160 | set_pte_phys(address, phys, prot); | |
161 | } | |
162 | ||
163 | unsigned long __initdata table_start, table_end; | |
164 | ||
165 | extern pmd_t temp_boot_pmds[]; | |
166 | ||
167 | static struct temp_map { | |
168 | pmd_t *pmd; | |
169 | void *address; | |
170 | int allocated; | |
171 | } temp_mappings[] __initdata = { | |
172 | { &temp_boot_pmds[0], (void *)(40UL * 1024 * 1024) }, | |
173 | { &temp_boot_pmds[1], (void *)(42UL * 1024 * 1024) }, | |
174 | {} | |
175 | }; | |
176 | ||
177 | static __init void *alloc_low_page(int *index, unsigned long *phys) | |
178 | { | |
179 | struct temp_map *ti; | |
180 | int i; | |
181 | unsigned long pfn = table_end++, paddr; | |
182 | void *adr; | |
183 | ||
184 | if (pfn >= end_pfn) | |
185 | panic("alloc_low_page: ran out of memory"); | |
186 | for (i = 0; temp_mappings[i].allocated; i++) { | |
187 | if (!temp_mappings[i].pmd) | |
188 | panic("alloc_low_page: ran out of temp mappings"); | |
189 | } | |
190 | ti = &temp_mappings[i]; | |
191 | paddr = (pfn << PAGE_SHIFT) & PMD_MASK; | |
192 | set_pmd(ti->pmd, __pmd(paddr | _KERNPG_TABLE | _PAGE_PSE)); | |
193 | ti->allocated = 1; | |
194 | __flush_tlb(); | |
195 | adr = ti->address + ((pfn << PAGE_SHIFT) & ~PMD_MASK); | |
196 | *index = i; | |
197 | *phys = pfn * PAGE_SIZE; | |
198 | return adr; | |
199 | } | |
200 | ||
201 | static __init void unmap_low_page(int i) | |
202 | { | |
203 | struct temp_map *ti = &temp_mappings[i]; | |
204 | set_pmd(ti->pmd, __pmd(0)); | |
205 | ti->allocated = 0; | |
206 | } | |
207 | ||
208 | static void __init phys_pud_init(pud_t *pud, unsigned long address, unsigned long end) | |
209 | { | |
210 | long i, j; | |
211 | ||
212 | i = pud_index(address); | |
213 | pud = pud + i; | |
214 | for (; i < PTRS_PER_PUD; pud++, i++) { | |
215 | int map; | |
216 | unsigned long paddr, pmd_phys; | |
217 | pmd_t *pmd; | |
218 | ||
219 | paddr = address + i*PUD_SIZE; | |
220 | if (paddr >= end) { | |
221 | for (; i < PTRS_PER_PUD; i++, pud++) | |
222 | set_pud(pud, __pud(0)); | |
223 | break; | |
224 | } | |
225 | ||
226 | if (!e820_mapped(paddr, paddr+PUD_SIZE, 0)) { | |
227 | set_pud(pud, __pud(0)); | |
228 | continue; | |
229 | } | |
230 | ||
231 | pmd = alloc_low_page(&map, &pmd_phys); | |
232 | set_pud(pud, __pud(pmd_phys | _KERNPG_TABLE)); | |
233 | for (j = 0; j < PTRS_PER_PMD; pmd++, j++, paddr += PMD_SIZE) { | |
234 | unsigned long pe; | |
235 | ||
236 | if (paddr >= end) { | |
237 | for (; j < PTRS_PER_PMD; j++, pmd++) | |
238 | set_pmd(pmd, __pmd(0)); | |
239 | break; | |
240 | } | |
241 | pe = _PAGE_NX|_PAGE_PSE | _KERNPG_TABLE | _PAGE_GLOBAL | paddr; | |
242 | pe &= __supported_pte_mask; | |
243 | set_pmd(pmd, __pmd(pe)); | |
244 | } | |
245 | unmap_low_page(map); | |
246 | } | |
247 | __flush_tlb(); | |
248 | } | |
249 | ||
250 | static void __init find_early_table_space(unsigned long end) | |
251 | { | |
252 | unsigned long puds, pmds, tables; | |
253 | ||
254 | puds = (end + PUD_SIZE - 1) >> PUD_SHIFT; | |
255 | pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT; | |
256 | tables = round_up(puds * sizeof(pud_t), PAGE_SIZE) + | |
257 | round_up(pmds * sizeof(pmd_t), PAGE_SIZE); | |
258 | ||
259 | table_start = find_e820_area(0x8000, __pa_symbol(&_text), tables); | |
260 | if (table_start == -1UL) | |
261 | panic("Cannot find space for the kernel page tables"); | |
262 | ||
263 | table_start >>= PAGE_SHIFT; | |
264 | table_end = table_start; | |
265 | } | |
266 | ||
267 | /* Setup the direct mapping of the physical memory at PAGE_OFFSET. | |
268 | This runs before bootmem is initialized and gets pages directly from the | |
269 | physical memory. To access them they are temporarily mapped. */ | |
270 | void __init init_memory_mapping(unsigned long start, unsigned long end) | |
271 | { | |
272 | unsigned long next; | |
273 | ||
274 | Dprintk("init_memory_mapping\n"); | |
275 | ||
276 | /* | |
277 | * Find space for the kernel direct mapping tables. | |
278 | * Later we should allocate these tables in the local node of the memory | |
279 | * mapped. Unfortunately this is done currently before the nodes are | |
280 | * discovered. | |
281 | */ | |
282 | find_early_table_space(end); | |
283 | ||
284 | start = (unsigned long)__va(start); | |
285 | end = (unsigned long)__va(end); | |
286 | ||
287 | for (; start < end; start = next) { | |
288 | int map; | |
289 | unsigned long pud_phys; | |
290 | pud_t *pud = alloc_low_page(&map, &pud_phys); | |
291 | next = start + PGDIR_SIZE; | |
292 | if (next > end) | |
293 | next = end; | |
294 | phys_pud_init(pud, __pa(start), __pa(next)); | |
295 | set_pgd(pgd_offset_k(start), mk_kernel_pgd(pud_phys)); | |
296 | unmap_low_page(map); | |
297 | } | |
298 | ||
299 | asm volatile("movq %%cr4,%0" : "=r" (mmu_cr4_features)); | |
300 | __flush_tlb_all(); | |
301 | early_printk("kernel direct mapping tables upto %lx @ %lx-%lx\n", end, | |
302 | table_start<<PAGE_SHIFT, | |
303 | table_end<<PAGE_SHIFT); | |
304 | } | |
305 | ||
f6c2e333 | 306 | void __cpuinit zap_low_mappings(int cpu) |
1da177e4 | 307 | { |
f6c2e333 SS |
308 | if (cpu == 0) { |
309 | pgd_t *pgd = pgd_offset_k(0UL); | |
310 | pgd_clear(pgd); | |
311 | } else { | |
312 | /* | |
313 | * For AP's, zap the low identity mappings by changing the cr3 | |
314 | * to init_level4_pgt and doing local flush tlb all | |
315 | */ | |
316 | asm volatile("movq %0,%%cr3" :: "r" (__pa_symbol(&init_level4_pgt))); | |
317 | } | |
318 | __flush_tlb_all(); | |
1da177e4 LT |
319 | } |
320 | ||
a2f1b424 AK |
321 | /* Compute zone sizes for the DMA and DMA32 zones in a node. */ |
322 | __init void | |
323 | size_zones(unsigned long *z, unsigned long *h, | |
324 | unsigned long start_pfn, unsigned long end_pfn) | |
325 | { | |
326 | int i; | |
327 | unsigned long w; | |
328 | ||
329 | for (i = 0; i < MAX_NR_ZONES; i++) | |
330 | z[i] = 0; | |
331 | ||
332 | if (start_pfn < MAX_DMA_PFN) | |
333 | z[ZONE_DMA] = MAX_DMA_PFN - start_pfn; | |
334 | if (start_pfn < MAX_DMA32_PFN) { | |
335 | unsigned long dma32_pfn = MAX_DMA32_PFN; | |
336 | if (dma32_pfn > end_pfn) | |
337 | dma32_pfn = end_pfn; | |
338 | z[ZONE_DMA32] = dma32_pfn - start_pfn; | |
339 | } | |
340 | z[ZONE_NORMAL] = end_pfn - start_pfn; | |
341 | ||
342 | /* Remove lower zones from higher ones. */ | |
343 | w = 0; | |
344 | for (i = 0; i < MAX_NR_ZONES; i++) { | |
345 | if (z[i]) | |
346 | z[i] -= w; | |
347 | w += z[i]; | |
348 | } | |
349 | ||
350 | /* Compute holes */ | |
576fc097 | 351 | w = start_pfn; |
a2f1b424 AK |
352 | for (i = 0; i < MAX_NR_ZONES; i++) { |
353 | unsigned long s = w; | |
354 | w += z[i]; | |
355 | h[i] = e820_hole_size(s, w); | |
356 | } | |
e18c6874 AK |
357 | |
358 | /* Add the space pace needed for mem_map to the holes too. */ | |
359 | for (i = 0; i < MAX_NR_ZONES; i++) | |
360 | h[i] += (z[i] * sizeof(struct page)) / PAGE_SIZE; | |
361 | ||
362 | /* The 16MB DMA zone has the kernel and other misc mappings. | |
363 | Account them too */ | |
364 | if (h[ZONE_DMA]) { | |
365 | h[ZONE_DMA] += dma_reserve; | |
366 | if (h[ZONE_DMA] >= z[ZONE_DMA]) { | |
367 | printk(KERN_WARNING | |
368 | "Kernel too large and filling up ZONE_DMA?\n"); | |
369 | h[ZONE_DMA] = z[ZONE_DMA]; | |
370 | } | |
371 | } | |
a2f1b424 AK |
372 | } |
373 | ||
2b97690f | 374 | #ifndef CONFIG_NUMA |
1da177e4 LT |
375 | void __init paging_init(void) |
376 | { | |
a2f1b424 AK |
377 | unsigned long zones[MAX_NR_ZONES], holes[MAX_NR_ZONES]; |
378 | size_zones(zones, holes, 0, end_pfn); | |
379 | free_area_init_node(0, NODE_DATA(0), zones, | |
380 | __pa(PAGE_OFFSET) >> PAGE_SHIFT, holes); | |
1da177e4 LT |
381 | } |
382 | #endif | |
383 | ||
384 | /* Unmap a kernel mapping if it exists. This is useful to avoid prefetches | |
385 | from the CPU leading to inconsistent cache lines. address and size | |
386 | must be aligned to 2MB boundaries. | |
387 | Does nothing when the mapping doesn't exist. */ | |
388 | void __init clear_kernel_mapping(unsigned long address, unsigned long size) | |
389 | { | |
390 | unsigned long end = address + size; | |
391 | ||
392 | BUG_ON(address & ~LARGE_PAGE_MASK); | |
393 | BUG_ON(size & ~LARGE_PAGE_MASK); | |
394 | ||
395 | for (; address < end; address += LARGE_PAGE_SIZE) { | |
396 | pgd_t *pgd = pgd_offset_k(address); | |
397 | pud_t *pud; | |
398 | pmd_t *pmd; | |
399 | if (pgd_none(*pgd)) | |
400 | continue; | |
401 | pud = pud_offset(pgd, address); | |
402 | if (pud_none(*pud)) | |
403 | continue; | |
404 | pmd = pmd_offset(pud, address); | |
405 | if (!pmd || pmd_none(*pmd)) | |
406 | continue; | |
407 | if (0 == (pmd_val(*pmd) & _PAGE_PSE)) { | |
408 | /* Could handle this, but it should not happen currently. */ | |
409 | printk(KERN_ERR | |
410 | "clear_kernel_mapping: mapping has been split. will leak memory\n"); | |
411 | pmd_ERROR(*pmd); | |
412 | } | |
413 | set_pmd(pmd, __pmd(0)); | |
414 | } | |
415 | __flush_tlb_all(); | |
416 | } | |
417 | ||
1da177e4 LT |
418 | static struct kcore_list kcore_mem, kcore_vmalloc, kcore_kernel, kcore_modules, |
419 | kcore_vsyscall; | |
420 | ||
421 | void __init mem_init(void) | |
422 | { | |
0a43e4bf | 423 | long codesize, reservedpages, datasize, initsize; |
1da177e4 LT |
424 | |
425 | #ifdef CONFIG_SWIOTLB | |
1da177e4 LT |
426 | if (!iommu_aperture && |
427 | (end_pfn >= 0xffffffff>>PAGE_SHIFT || force_iommu)) | |
428 | swiotlb = 1; | |
429 | if (swiotlb) | |
430 | swiotlb_init(); | |
431 | #endif | |
432 | ||
433 | /* How many end-of-memory variables you have, grandma! */ | |
434 | max_low_pfn = end_pfn; | |
435 | max_pfn = end_pfn; | |
436 | num_physpages = end_pfn; | |
437 | high_memory = (void *) __va(end_pfn * PAGE_SIZE); | |
438 | ||
439 | /* clear the zero-page */ | |
440 | memset(empty_zero_page, 0, PAGE_SIZE); | |
441 | ||
442 | reservedpages = 0; | |
443 | ||
444 | /* this will put all low memory onto the freelists */ | |
2b97690f | 445 | #ifdef CONFIG_NUMA |
0a43e4bf | 446 | totalram_pages = numa_free_all_bootmem(); |
1da177e4 | 447 | #else |
0a43e4bf | 448 | totalram_pages = free_all_bootmem(); |
1da177e4 | 449 | #endif |
0a43e4bf | 450 | reservedpages = end_pfn - totalram_pages - e820_hole_size(0, end_pfn); |
1da177e4 LT |
451 | |
452 | after_bootmem = 1; | |
453 | ||
454 | codesize = (unsigned long) &_etext - (unsigned long) &_text; | |
455 | datasize = (unsigned long) &_edata - (unsigned long) &_etext; | |
456 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; | |
457 | ||
458 | /* Register memory areas for /proc/kcore */ | |
459 | kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT); | |
460 | kclist_add(&kcore_vmalloc, (void *)VMALLOC_START, | |
461 | VMALLOC_END-VMALLOC_START); | |
462 | kclist_add(&kcore_kernel, &_stext, _end - _stext); | |
463 | kclist_add(&kcore_modules, (void *)MODULES_VADDR, MODULES_LEN); | |
464 | kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START, | |
465 | VSYSCALL_END - VSYSCALL_START); | |
466 | ||
0a43e4bf | 467 | printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n", |
1da177e4 LT |
468 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), |
469 | end_pfn << (PAGE_SHIFT-10), | |
470 | codesize >> 10, | |
471 | reservedpages << (PAGE_SHIFT-10), | |
472 | datasize >> 10, | |
473 | initsize >> 10); | |
474 | ||
f6c2e333 | 475 | #ifdef CONFIG_SMP |
1da177e4 | 476 | /* |
f6c2e333 SS |
477 | * Sync boot_level4_pgt mappings with the init_level4_pgt |
478 | * except for the low identity mappings which are already zapped | |
479 | * in init_level4_pgt. This sync-up is essential for AP's bringup | |
1da177e4 | 480 | */ |
f6c2e333 | 481 | memcpy(boot_level4_pgt+1, init_level4_pgt+1, (PTRS_PER_PGD-1)*sizeof(pgd_t)); |
1da177e4 LT |
482 | #endif |
483 | } | |
484 | ||
1da177e4 LT |
485 | void free_initmem(void) |
486 | { | |
487 | unsigned long addr; | |
488 | ||
489 | addr = (unsigned long)(&__init_begin); | |
490 | for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) { | |
491 | ClearPageReserved(virt_to_page(addr)); | |
492 | set_page_count(virt_to_page(addr), 1); | |
493 | memset((void *)(addr & ~(PAGE_SIZE-1)), 0xcc, PAGE_SIZE); | |
494 | free_page(addr); | |
495 | totalram_pages++; | |
496 | } | |
497 | memset(__initdata_begin, 0xba, __initdata_end - __initdata_begin); | |
2bc0414e | 498 | printk ("Freeing unused kernel memory: %luk freed\n", (__init_end - __init_begin) >> 10); |
1da177e4 LT |
499 | } |
500 | ||
501 | #ifdef CONFIG_BLK_DEV_INITRD | |
502 | void free_initrd_mem(unsigned long start, unsigned long end) | |
503 | { | |
504 | if (start < (unsigned long)&_end) | |
505 | return; | |
506 | printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); | |
507 | for (; start < end; start += PAGE_SIZE) { | |
508 | ClearPageReserved(virt_to_page(start)); | |
509 | set_page_count(virt_to_page(start), 1); | |
510 | free_page(start); | |
511 | totalram_pages++; | |
512 | } | |
513 | } | |
514 | #endif | |
515 | ||
516 | void __init reserve_bootmem_generic(unsigned long phys, unsigned len) | |
517 | { | |
518 | /* Should check here against the e820 map to avoid double free */ | |
2b97690f | 519 | #ifdef CONFIG_NUMA |
1da177e4 LT |
520 | int nid = phys_to_nid(phys); |
521 | reserve_bootmem_node(NODE_DATA(nid), phys, len); | |
522 | #else | |
523 | reserve_bootmem(phys, len); | |
524 | #endif | |
e18c6874 AK |
525 | if (phys+len <= MAX_DMA_PFN*PAGE_SIZE) |
526 | dma_reserve += len / PAGE_SIZE; | |
1da177e4 LT |
527 | } |
528 | ||
529 | int kern_addr_valid(unsigned long addr) | |
530 | { | |
531 | unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT; | |
532 | pgd_t *pgd; | |
533 | pud_t *pud; | |
534 | pmd_t *pmd; | |
535 | pte_t *pte; | |
536 | ||
537 | if (above != 0 && above != -1UL) | |
538 | return 0; | |
539 | ||
540 | pgd = pgd_offset_k(addr); | |
541 | if (pgd_none(*pgd)) | |
542 | return 0; | |
543 | ||
544 | pud = pud_offset(pgd, addr); | |
545 | if (pud_none(*pud)) | |
546 | return 0; | |
547 | ||
548 | pmd = pmd_offset(pud, addr); | |
549 | if (pmd_none(*pmd)) | |
550 | return 0; | |
551 | if (pmd_large(*pmd)) | |
552 | return pfn_valid(pmd_pfn(*pmd)); | |
553 | ||
554 | pte = pte_offset_kernel(pmd, addr); | |
555 | if (pte_none(*pte)) | |
556 | return 0; | |
557 | return pfn_valid(pte_pfn(*pte)); | |
558 | } | |
559 | ||
560 | #ifdef CONFIG_SYSCTL | |
561 | #include <linux/sysctl.h> | |
562 | ||
563 | extern int exception_trace, page_fault_trace; | |
564 | ||
565 | static ctl_table debug_table2[] = { | |
566 | { 99, "exception-trace", &exception_trace, sizeof(int), 0644, NULL, | |
567 | proc_dointvec }, | |
1da177e4 LT |
568 | { 0, } |
569 | }; | |
570 | ||
571 | static ctl_table debug_root_table2[] = { | |
572 | { .ctl_name = CTL_DEBUG, .procname = "debug", .mode = 0555, | |
573 | .child = debug_table2 }, | |
574 | { 0 }, | |
575 | }; | |
576 | ||
577 | static __init int x8664_sysctl_init(void) | |
578 | { | |
579 | register_sysctl_table(debug_root_table2, 1); | |
580 | return 0; | |
581 | } | |
582 | __initcall(x8664_sysctl_init); | |
583 | #endif | |
584 | ||
1e014410 AK |
585 | /* A pseudo VMAs to allow ptrace access for the vsyscall page. This only |
586 | covers the 64bit vsyscall page now. 32bit has a real VMA now and does | |
587 | not need special handling anymore. */ | |
1da177e4 LT |
588 | |
589 | static struct vm_area_struct gate_vma = { | |
590 | .vm_start = VSYSCALL_START, | |
591 | .vm_end = VSYSCALL_END, | |
592 | .vm_page_prot = PAGE_READONLY | |
593 | }; | |
594 | ||
1da177e4 LT |
595 | struct vm_area_struct *get_gate_vma(struct task_struct *tsk) |
596 | { | |
597 | #ifdef CONFIG_IA32_EMULATION | |
1e014410 AK |
598 | if (test_tsk_thread_flag(tsk, TIF_IA32)) |
599 | return NULL; | |
1da177e4 LT |
600 | #endif |
601 | return &gate_vma; | |
602 | } | |
603 | ||
604 | int in_gate_area(struct task_struct *task, unsigned long addr) | |
605 | { | |
606 | struct vm_area_struct *vma = get_gate_vma(task); | |
1e014410 AK |
607 | if (!vma) |
608 | return 0; | |
1da177e4 LT |
609 | return (addr >= vma->vm_start) && (addr < vma->vm_end); |
610 | } | |
611 | ||
612 | /* Use this when you have no reliable task/vma, typically from interrupt | |
613 | * context. It is less reliable than using the task's vma and may give | |
614 | * false positives. | |
615 | */ | |
616 | int in_gate_area_no_task(unsigned long addr) | |
617 | { | |
1e014410 | 618 | return (addr >= VSYSCALL_START) && (addr < VSYSCALL_END); |
1da177e4 | 619 | } |