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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> |
17a941d8 | 26 | #include <linux/dma-mapping.h> |
1da177e4 LT |
27 | |
28 | #include <asm/processor.h> | |
29 | #include <asm/system.h> | |
30 | #include <asm/uaccess.h> | |
31 | #include <asm/pgtable.h> | |
32 | #include <asm/pgalloc.h> | |
33 | #include <asm/dma.h> | |
34 | #include <asm/fixmap.h> | |
35 | #include <asm/e820.h> | |
36 | #include <asm/apic.h> | |
37 | #include <asm/tlb.h> | |
38 | #include <asm/mmu_context.h> | |
39 | #include <asm/proto.h> | |
40 | #include <asm/smp.h> | |
2bc0414e | 41 | #include <asm/sections.h> |
17a941d8 MBY |
42 | #include <asm/dma-mapping.h> |
43 | #include <asm/swiotlb.h> | |
1da177e4 LT |
44 | |
45 | #ifndef Dprintk | |
46 | #define Dprintk(x...) | |
47 | #endif | |
48 | ||
17a941d8 MBY |
49 | struct dma_mapping_ops* dma_ops; |
50 | EXPORT_SYMBOL(dma_ops); | |
51 | ||
e18c6874 AK |
52 | static unsigned long dma_reserve __initdata; |
53 | ||
1da177e4 LT |
54 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); |
55 | ||
56 | /* | |
57 | * NOTE: pagetable_init alloc all the fixmap pagetables contiguous on the | |
58 | * physical space so we can cache the place of the first one and move | |
59 | * around without checking the pgd every time. | |
60 | */ | |
61 | ||
62 | void show_mem(void) | |
63 | { | |
e92343cc AK |
64 | long i, total = 0, reserved = 0; |
65 | long shared = 0, cached = 0; | |
1da177e4 LT |
66 | pg_data_t *pgdat; |
67 | struct page *page; | |
68 | ||
e92343cc | 69 | printk(KERN_INFO "Mem-info:\n"); |
1da177e4 | 70 | show_free_areas(); |
e92343cc | 71 | printk(KERN_INFO "Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); |
1da177e4 LT |
72 | |
73 | for_each_pgdat(pgdat) { | |
74 | for (i = 0; i < pgdat->node_spanned_pages; ++i) { | |
75 | page = pfn_to_page(pgdat->node_start_pfn + i); | |
76 | total++; | |
e92343cc AK |
77 | if (PageReserved(page)) |
78 | reserved++; | |
79 | else if (PageSwapCache(page)) | |
80 | cached++; | |
81 | else if (page_count(page)) | |
82 | shared += page_count(page) - 1; | |
1da177e4 LT |
83 | } |
84 | } | |
e92343cc AK |
85 | printk(KERN_INFO "%lu pages of RAM\n", total); |
86 | printk(KERN_INFO "%lu reserved pages\n",reserved); | |
87 | printk(KERN_INFO "%lu pages shared\n",shared); | |
88 | printk(KERN_INFO "%lu pages swap cached\n",cached); | |
1da177e4 LT |
89 | } |
90 | ||
91 | /* References to section boundaries */ | |
92 | ||
1da177e4 LT |
93 | int after_bootmem; |
94 | ||
95 | static void *spp_getpage(void) | |
96 | { | |
97 | void *ptr; | |
98 | if (after_bootmem) | |
99 | ptr = (void *) get_zeroed_page(GFP_ATOMIC); | |
100 | else | |
101 | ptr = alloc_bootmem_pages(PAGE_SIZE); | |
102 | if (!ptr || ((unsigned long)ptr & ~PAGE_MASK)) | |
103 | panic("set_pte_phys: cannot allocate page data %s\n", after_bootmem?"after bootmem":""); | |
104 | ||
105 | Dprintk("spp_getpage %p\n", ptr); | |
106 | return ptr; | |
107 | } | |
108 | ||
109 | static void set_pte_phys(unsigned long vaddr, | |
110 | unsigned long phys, pgprot_t prot) | |
111 | { | |
112 | pgd_t *pgd; | |
113 | pud_t *pud; | |
114 | pmd_t *pmd; | |
115 | pte_t *pte, new_pte; | |
116 | ||
117 | Dprintk("set_pte_phys %lx to %lx\n", vaddr, phys); | |
118 | ||
119 | pgd = pgd_offset_k(vaddr); | |
120 | if (pgd_none(*pgd)) { | |
121 | printk("PGD FIXMAP MISSING, it should be setup in head.S!\n"); | |
122 | return; | |
123 | } | |
124 | pud = pud_offset(pgd, vaddr); | |
125 | if (pud_none(*pud)) { | |
126 | pmd = (pmd_t *) spp_getpage(); | |
127 | set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE | _PAGE_USER)); | |
128 | if (pmd != pmd_offset(pud, 0)) { | |
129 | printk("PAGETABLE BUG #01! %p <-> %p\n", pmd, pmd_offset(pud,0)); | |
130 | return; | |
131 | } | |
132 | } | |
133 | pmd = pmd_offset(pud, vaddr); | |
134 | if (pmd_none(*pmd)) { | |
135 | pte = (pte_t *) spp_getpage(); | |
136 | set_pmd(pmd, __pmd(__pa(pte) | _KERNPG_TABLE | _PAGE_USER)); | |
137 | if (pte != pte_offset_kernel(pmd, 0)) { | |
138 | printk("PAGETABLE BUG #02!\n"); | |
139 | return; | |
140 | } | |
141 | } | |
142 | new_pte = pfn_pte(phys >> PAGE_SHIFT, prot); | |
143 | ||
144 | pte = pte_offset_kernel(pmd, vaddr); | |
145 | if (!pte_none(*pte) && | |
146 | pte_val(*pte) != (pte_val(new_pte) & __supported_pte_mask)) | |
147 | pte_ERROR(*pte); | |
148 | set_pte(pte, new_pte); | |
149 | ||
150 | /* | |
151 | * It's enough to flush this one mapping. | |
152 | * (PGE mappings get flushed as well) | |
153 | */ | |
154 | __flush_tlb_one(vaddr); | |
155 | } | |
156 | ||
157 | /* NOTE: this is meant to be run only at boot */ | |
158 | void __set_fixmap (enum fixed_addresses idx, unsigned long phys, pgprot_t prot) | |
159 | { | |
160 | unsigned long address = __fix_to_virt(idx); | |
161 | ||
162 | if (idx >= __end_of_fixed_addresses) { | |
163 | printk("Invalid __set_fixmap\n"); | |
164 | return; | |
165 | } | |
166 | set_pte_phys(address, phys, prot); | |
167 | } | |
168 | ||
169 | unsigned long __initdata table_start, table_end; | |
170 | ||
171 | extern pmd_t temp_boot_pmds[]; | |
172 | ||
173 | static struct temp_map { | |
174 | pmd_t *pmd; | |
175 | void *address; | |
176 | int allocated; | |
177 | } temp_mappings[] __initdata = { | |
178 | { &temp_boot_pmds[0], (void *)(40UL * 1024 * 1024) }, | |
179 | { &temp_boot_pmds[1], (void *)(42UL * 1024 * 1024) }, | |
180 | {} | |
181 | }; | |
182 | ||
183 | static __init void *alloc_low_page(int *index, unsigned long *phys) | |
184 | { | |
185 | struct temp_map *ti; | |
186 | int i; | |
187 | unsigned long pfn = table_end++, paddr; | |
188 | void *adr; | |
189 | ||
190 | if (pfn >= end_pfn) | |
191 | panic("alloc_low_page: ran out of memory"); | |
192 | for (i = 0; temp_mappings[i].allocated; i++) { | |
193 | if (!temp_mappings[i].pmd) | |
194 | panic("alloc_low_page: ran out of temp mappings"); | |
195 | } | |
196 | ti = &temp_mappings[i]; | |
197 | paddr = (pfn << PAGE_SHIFT) & PMD_MASK; | |
198 | set_pmd(ti->pmd, __pmd(paddr | _KERNPG_TABLE | _PAGE_PSE)); | |
199 | ti->allocated = 1; | |
200 | __flush_tlb(); | |
201 | adr = ti->address + ((pfn << PAGE_SHIFT) & ~PMD_MASK); | |
202 | *index = i; | |
203 | *phys = pfn * PAGE_SIZE; | |
204 | return adr; | |
205 | } | |
206 | ||
207 | static __init void unmap_low_page(int i) | |
208 | { | |
209 | struct temp_map *ti = &temp_mappings[i]; | |
210 | set_pmd(ti->pmd, __pmd(0)); | |
211 | ti->allocated = 0; | |
212 | } | |
213 | ||
214 | static void __init phys_pud_init(pud_t *pud, unsigned long address, unsigned long end) | |
215 | { | |
216 | long i, j; | |
217 | ||
218 | i = pud_index(address); | |
219 | pud = pud + i; | |
220 | for (; i < PTRS_PER_PUD; pud++, i++) { | |
221 | int map; | |
222 | unsigned long paddr, pmd_phys; | |
223 | pmd_t *pmd; | |
224 | ||
225 | paddr = address + i*PUD_SIZE; | |
226 | if (paddr >= end) { | |
227 | for (; i < PTRS_PER_PUD; i++, pud++) | |
228 | set_pud(pud, __pud(0)); | |
229 | break; | |
230 | } | |
231 | ||
232 | if (!e820_mapped(paddr, paddr+PUD_SIZE, 0)) { | |
233 | set_pud(pud, __pud(0)); | |
234 | continue; | |
235 | } | |
236 | ||
237 | pmd = alloc_low_page(&map, &pmd_phys); | |
238 | set_pud(pud, __pud(pmd_phys | _KERNPG_TABLE)); | |
239 | for (j = 0; j < PTRS_PER_PMD; pmd++, j++, paddr += PMD_SIZE) { | |
240 | unsigned long pe; | |
241 | ||
242 | if (paddr >= end) { | |
243 | for (; j < PTRS_PER_PMD; j++, pmd++) | |
244 | set_pmd(pmd, __pmd(0)); | |
245 | break; | |
246 | } | |
247 | pe = _PAGE_NX|_PAGE_PSE | _KERNPG_TABLE | _PAGE_GLOBAL | paddr; | |
248 | pe &= __supported_pte_mask; | |
249 | set_pmd(pmd, __pmd(pe)); | |
250 | } | |
251 | unmap_low_page(map); | |
252 | } | |
253 | __flush_tlb(); | |
254 | } | |
255 | ||
256 | static void __init find_early_table_space(unsigned long end) | |
257 | { | |
6c5acd16 | 258 | unsigned long puds, pmds, tables, start; |
1da177e4 LT |
259 | |
260 | puds = (end + PUD_SIZE - 1) >> PUD_SHIFT; | |
261 | pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT; | |
262 | tables = round_up(puds * sizeof(pud_t), PAGE_SIZE) + | |
263 | round_up(pmds * sizeof(pmd_t), PAGE_SIZE); | |
264 | ||
ee408c79 AK |
265 | /* RED-PEN putting page tables only on node 0 could |
266 | cause a hotspot and fill up ZONE_DMA. The page tables | |
267 | need roughly 0.5KB per GB. */ | |
268 | start = 0x8000; | |
269 | table_start = find_e820_area(start, end, tables); | |
1da177e4 LT |
270 | if (table_start == -1UL) |
271 | panic("Cannot find space for the kernel page tables"); | |
272 | ||
273 | table_start >>= PAGE_SHIFT; | |
274 | table_end = table_start; | |
275 | } | |
276 | ||
277 | /* Setup the direct mapping of the physical memory at PAGE_OFFSET. | |
278 | This runs before bootmem is initialized and gets pages directly from the | |
279 | physical memory. To access them they are temporarily mapped. */ | |
280 | void __init init_memory_mapping(unsigned long start, unsigned long end) | |
281 | { | |
282 | unsigned long next; | |
283 | ||
284 | Dprintk("init_memory_mapping\n"); | |
285 | ||
286 | /* | |
287 | * Find space for the kernel direct mapping tables. | |
288 | * Later we should allocate these tables in the local node of the memory | |
289 | * mapped. Unfortunately this is done currently before the nodes are | |
290 | * discovered. | |
291 | */ | |
292 | find_early_table_space(end); | |
293 | ||
294 | start = (unsigned long)__va(start); | |
295 | end = (unsigned long)__va(end); | |
296 | ||
297 | for (; start < end; start = next) { | |
298 | int map; | |
299 | unsigned long pud_phys; | |
300 | pud_t *pud = alloc_low_page(&map, &pud_phys); | |
301 | next = start + PGDIR_SIZE; | |
302 | if (next > end) | |
303 | next = end; | |
304 | phys_pud_init(pud, __pa(start), __pa(next)); | |
305 | set_pgd(pgd_offset_k(start), mk_kernel_pgd(pud_phys)); | |
306 | unmap_low_page(map); | |
307 | } | |
308 | ||
309 | asm volatile("movq %%cr4,%0" : "=r" (mmu_cr4_features)); | |
310 | __flush_tlb_all(); | |
311 | early_printk("kernel direct mapping tables upto %lx @ %lx-%lx\n", end, | |
312 | table_start<<PAGE_SHIFT, | |
313 | table_end<<PAGE_SHIFT); | |
314 | } | |
315 | ||
f6c2e333 | 316 | void __cpuinit zap_low_mappings(int cpu) |
1da177e4 | 317 | { |
f6c2e333 SS |
318 | if (cpu == 0) { |
319 | pgd_t *pgd = pgd_offset_k(0UL); | |
320 | pgd_clear(pgd); | |
321 | } else { | |
322 | /* | |
323 | * For AP's, zap the low identity mappings by changing the cr3 | |
324 | * to init_level4_pgt and doing local flush tlb all | |
325 | */ | |
326 | asm volatile("movq %0,%%cr3" :: "r" (__pa_symbol(&init_level4_pgt))); | |
327 | } | |
328 | __flush_tlb_all(); | |
1da177e4 LT |
329 | } |
330 | ||
a2f1b424 AK |
331 | /* Compute zone sizes for the DMA and DMA32 zones in a node. */ |
332 | __init void | |
333 | size_zones(unsigned long *z, unsigned long *h, | |
334 | unsigned long start_pfn, unsigned long end_pfn) | |
335 | { | |
336 | int i; | |
337 | unsigned long w; | |
338 | ||
339 | for (i = 0; i < MAX_NR_ZONES; i++) | |
340 | z[i] = 0; | |
341 | ||
342 | if (start_pfn < MAX_DMA_PFN) | |
343 | z[ZONE_DMA] = MAX_DMA_PFN - start_pfn; | |
344 | if (start_pfn < MAX_DMA32_PFN) { | |
345 | unsigned long dma32_pfn = MAX_DMA32_PFN; | |
346 | if (dma32_pfn > end_pfn) | |
347 | dma32_pfn = end_pfn; | |
348 | z[ZONE_DMA32] = dma32_pfn - start_pfn; | |
349 | } | |
350 | z[ZONE_NORMAL] = end_pfn - start_pfn; | |
351 | ||
352 | /* Remove lower zones from higher ones. */ | |
353 | w = 0; | |
354 | for (i = 0; i < MAX_NR_ZONES; i++) { | |
355 | if (z[i]) | |
356 | z[i] -= w; | |
357 | w += z[i]; | |
358 | } | |
359 | ||
360 | /* Compute holes */ | |
576fc097 | 361 | w = start_pfn; |
a2f1b424 AK |
362 | for (i = 0; i < MAX_NR_ZONES; i++) { |
363 | unsigned long s = w; | |
364 | w += z[i]; | |
365 | h[i] = e820_hole_size(s, w); | |
366 | } | |
e18c6874 AK |
367 | |
368 | /* Add the space pace needed for mem_map to the holes too. */ | |
369 | for (i = 0; i < MAX_NR_ZONES; i++) | |
370 | h[i] += (z[i] * sizeof(struct page)) / PAGE_SIZE; | |
371 | ||
372 | /* The 16MB DMA zone has the kernel and other misc mappings. | |
373 | Account them too */ | |
374 | if (h[ZONE_DMA]) { | |
375 | h[ZONE_DMA] += dma_reserve; | |
376 | if (h[ZONE_DMA] >= z[ZONE_DMA]) { | |
377 | printk(KERN_WARNING | |
378 | "Kernel too large and filling up ZONE_DMA?\n"); | |
379 | h[ZONE_DMA] = z[ZONE_DMA]; | |
380 | } | |
381 | } | |
a2f1b424 AK |
382 | } |
383 | ||
2b97690f | 384 | #ifndef CONFIG_NUMA |
1da177e4 LT |
385 | void __init paging_init(void) |
386 | { | |
a2f1b424 AK |
387 | unsigned long zones[MAX_NR_ZONES], holes[MAX_NR_ZONES]; |
388 | size_zones(zones, holes, 0, end_pfn); | |
389 | free_area_init_node(0, NODE_DATA(0), zones, | |
390 | __pa(PAGE_OFFSET) >> PAGE_SHIFT, holes); | |
1da177e4 LT |
391 | } |
392 | #endif | |
393 | ||
394 | /* Unmap a kernel mapping if it exists. This is useful to avoid prefetches | |
395 | from the CPU leading to inconsistent cache lines. address and size | |
396 | must be aligned to 2MB boundaries. | |
397 | Does nothing when the mapping doesn't exist. */ | |
398 | void __init clear_kernel_mapping(unsigned long address, unsigned long size) | |
399 | { | |
400 | unsigned long end = address + size; | |
401 | ||
402 | BUG_ON(address & ~LARGE_PAGE_MASK); | |
403 | BUG_ON(size & ~LARGE_PAGE_MASK); | |
404 | ||
405 | for (; address < end; address += LARGE_PAGE_SIZE) { | |
406 | pgd_t *pgd = pgd_offset_k(address); | |
407 | pud_t *pud; | |
408 | pmd_t *pmd; | |
409 | if (pgd_none(*pgd)) | |
410 | continue; | |
411 | pud = pud_offset(pgd, address); | |
412 | if (pud_none(*pud)) | |
413 | continue; | |
414 | pmd = pmd_offset(pud, address); | |
415 | if (!pmd || pmd_none(*pmd)) | |
416 | continue; | |
417 | if (0 == (pmd_val(*pmd) & _PAGE_PSE)) { | |
418 | /* Could handle this, but it should not happen currently. */ | |
419 | printk(KERN_ERR | |
420 | "clear_kernel_mapping: mapping has been split. will leak memory\n"); | |
421 | pmd_ERROR(*pmd); | |
422 | } | |
423 | set_pmd(pmd, __pmd(0)); | |
424 | } | |
425 | __flush_tlb_all(); | |
426 | } | |
427 | ||
1da177e4 LT |
428 | static struct kcore_list kcore_mem, kcore_vmalloc, kcore_kernel, kcore_modules, |
429 | kcore_vsyscall; | |
430 | ||
431 | void __init mem_init(void) | |
432 | { | |
0a43e4bf | 433 | long codesize, reservedpages, datasize, initsize; |
1da177e4 LT |
434 | |
435 | #ifdef CONFIG_SWIOTLB | |
17a941d8 | 436 | pci_swiotlb_init(); |
1da177e4 | 437 | #endif |
17a941d8 | 438 | no_iommu_init(); |
1da177e4 LT |
439 | |
440 | /* How many end-of-memory variables you have, grandma! */ | |
441 | max_low_pfn = end_pfn; | |
442 | max_pfn = end_pfn; | |
443 | num_physpages = end_pfn; | |
444 | high_memory = (void *) __va(end_pfn * PAGE_SIZE); | |
445 | ||
446 | /* clear the zero-page */ | |
447 | memset(empty_zero_page, 0, PAGE_SIZE); | |
448 | ||
449 | reservedpages = 0; | |
450 | ||
451 | /* this will put all low memory onto the freelists */ | |
2b97690f | 452 | #ifdef CONFIG_NUMA |
0a43e4bf | 453 | totalram_pages = numa_free_all_bootmem(); |
1da177e4 | 454 | #else |
0a43e4bf | 455 | totalram_pages = free_all_bootmem(); |
1da177e4 | 456 | #endif |
0a43e4bf | 457 | reservedpages = end_pfn - totalram_pages - e820_hole_size(0, end_pfn); |
1da177e4 LT |
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 | ||
0a43e4bf | 474 | printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n", |
1da177e4 LT |
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 | ||
f6c2e333 | 482 | #ifdef CONFIG_SMP |
1da177e4 | 483 | /* |
f6c2e333 SS |
484 | * Sync boot_level4_pgt mappings with the init_level4_pgt |
485 | * except for the low identity mappings which are already zapped | |
486 | * in init_level4_pgt. This sync-up is essential for AP's bringup | |
1da177e4 | 487 | */ |
f6c2e333 | 488 | memcpy(boot_level4_pgt+1, init_level4_pgt+1, (PTRS_PER_PGD-1)*sizeof(pgd_t)); |
1da177e4 LT |
489 | #endif |
490 | } | |
491 | ||
1da177e4 LT |
492 | void free_initmem(void) |
493 | { | |
494 | unsigned long addr; | |
495 | ||
496 | addr = (unsigned long)(&__init_begin); | |
497 | for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) { | |
498 | ClearPageReserved(virt_to_page(addr)); | |
499 | set_page_count(virt_to_page(addr), 1); | |
500 | memset((void *)(addr & ~(PAGE_SIZE-1)), 0xcc, PAGE_SIZE); | |
501 | free_page(addr); | |
502 | totalram_pages++; | |
503 | } | |
504 | memset(__initdata_begin, 0xba, __initdata_end - __initdata_begin); | |
2bc0414e | 505 | printk ("Freeing unused kernel memory: %luk freed\n", (__init_end - __init_begin) >> 10); |
1da177e4 LT |
506 | } |
507 | ||
67df197b AV |
508 | #ifdef CONFIG_DEBUG_RODATA |
509 | ||
510 | extern char __start_rodata, __end_rodata; | |
511 | void mark_rodata_ro(void) | |
512 | { | |
513 | unsigned long addr = (unsigned long)&__start_rodata; | |
514 | ||
515 | for (; addr < (unsigned long)&__end_rodata; addr += PAGE_SIZE) | |
516 | change_page_attr_addr(addr, 1, PAGE_KERNEL_RO); | |
517 | ||
518 | printk ("Write protecting the kernel read-only data: %luk\n", | |
519 | (&__end_rodata - &__start_rodata) >> 10); | |
520 | ||
521 | /* | |
522 | * change_page_attr_addr() requires a global_flush_tlb() call after it. | |
523 | * We do this after the printk so that if something went wrong in the | |
524 | * change, the printk gets out at least to give a better debug hint | |
525 | * of who is the culprit. | |
526 | */ | |
527 | global_flush_tlb(); | |
528 | } | |
529 | #endif | |
530 | ||
1da177e4 LT |
531 | #ifdef CONFIG_BLK_DEV_INITRD |
532 | void free_initrd_mem(unsigned long start, unsigned long end) | |
533 | { | |
534 | if (start < (unsigned long)&_end) | |
535 | return; | |
536 | printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); | |
537 | for (; start < end; start += PAGE_SIZE) { | |
538 | ClearPageReserved(virt_to_page(start)); | |
539 | set_page_count(virt_to_page(start), 1); | |
540 | free_page(start); | |
541 | totalram_pages++; | |
542 | } | |
543 | } | |
544 | #endif | |
545 | ||
546 | void __init reserve_bootmem_generic(unsigned long phys, unsigned len) | |
547 | { | |
548 | /* Should check here against the e820 map to avoid double free */ | |
2b97690f | 549 | #ifdef CONFIG_NUMA |
1da177e4 LT |
550 | int nid = phys_to_nid(phys); |
551 | reserve_bootmem_node(NODE_DATA(nid), phys, len); | |
552 | #else | |
553 | reserve_bootmem(phys, len); | |
554 | #endif | |
e18c6874 AK |
555 | if (phys+len <= MAX_DMA_PFN*PAGE_SIZE) |
556 | dma_reserve += len / PAGE_SIZE; | |
1da177e4 LT |
557 | } |
558 | ||
559 | int kern_addr_valid(unsigned long addr) | |
560 | { | |
561 | unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT; | |
562 | pgd_t *pgd; | |
563 | pud_t *pud; | |
564 | pmd_t *pmd; | |
565 | pte_t *pte; | |
566 | ||
567 | if (above != 0 && above != -1UL) | |
568 | return 0; | |
569 | ||
570 | pgd = pgd_offset_k(addr); | |
571 | if (pgd_none(*pgd)) | |
572 | return 0; | |
573 | ||
574 | pud = pud_offset(pgd, addr); | |
575 | if (pud_none(*pud)) | |
576 | return 0; | |
577 | ||
578 | pmd = pmd_offset(pud, addr); | |
579 | if (pmd_none(*pmd)) | |
580 | return 0; | |
581 | if (pmd_large(*pmd)) | |
582 | return pfn_valid(pmd_pfn(*pmd)); | |
583 | ||
584 | pte = pte_offset_kernel(pmd, addr); | |
585 | if (pte_none(*pte)) | |
586 | return 0; | |
587 | return pfn_valid(pte_pfn(*pte)); | |
588 | } | |
589 | ||
590 | #ifdef CONFIG_SYSCTL | |
591 | #include <linux/sysctl.h> | |
592 | ||
593 | extern int exception_trace, page_fault_trace; | |
594 | ||
595 | static ctl_table debug_table2[] = { | |
596 | { 99, "exception-trace", &exception_trace, sizeof(int), 0644, NULL, | |
597 | proc_dointvec }, | |
1da177e4 LT |
598 | { 0, } |
599 | }; | |
600 | ||
601 | static ctl_table debug_root_table2[] = { | |
602 | { .ctl_name = CTL_DEBUG, .procname = "debug", .mode = 0555, | |
603 | .child = debug_table2 }, | |
604 | { 0 }, | |
605 | }; | |
606 | ||
607 | static __init int x8664_sysctl_init(void) | |
608 | { | |
609 | register_sysctl_table(debug_root_table2, 1); | |
610 | return 0; | |
611 | } | |
612 | __initcall(x8664_sysctl_init); | |
613 | #endif | |
614 | ||
1e014410 AK |
615 | /* A pseudo VMAs to allow ptrace access for the vsyscall page. This only |
616 | covers the 64bit vsyscall page now. 32bit has a real VMA now and does | |
617 | not need special handling anymore. */ | |
1da177e4 LT |
618 | |
619 | static struct vm_area_struct gate_vma = { | |
620 | .vm_start = VSYSCALL_START, | |
621 | .vm_end = VSYSCALL_END, | |
622 | .vm_page_prot = PAGE_READONLY | |
623 | }; | |
624 | ||
1da177e4 LT |
625 | struct vm_area_struct *get_gate_vma(struct task_struct *tsk) |
626 | { | |
627 | #ifdef CONFIG_IA32_EMULATION | |
1e014410 AK |
628 | if (test_tsk_thread_flag(tsk, TIF_IA32)) |
629 | return NULL; | |
1da177e4 LT |
630 | #endif |
631 | return &gate_vma; | |
632 | } | |
633 | ||
634 | int in_gate_area(struct task_struct *task, unsigned long addr) | |
635 | { | |
636 | struct vm_area_struct *vma = get_gate_vma(task); | |
1e014410 AK |
637 | if (!vma) |
638 | return 0; | |
1da177e4 LT |
639 | return (addr >= vma->vm_start) && (addr < vma->vm_end); |
640 | } | |
641 | ||
642 | /* Use this when you have no reliable task/vma, typically from interrupt | |
643 | * context. It is less reliable than using the task's vma and may give | |
644 | * false positives. | |
645 | */ | |
646 | int in_gate_area_no_task(unsigned long addr) | |
647 | { | |
1e014410 | 648 | return (addr >= VSYSCALL_START) && (addr < VSYSCALL_END); |
1da177e4 | 649 | } |