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Commit | Line | Data |
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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 | ||
1da177e4 LT |
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> | |
59170891 | 24 | #include <linux/pci.h> |
6fb14755 | 25 | #include <linux/pfn.h> |
c9cf5528 | 26 | #include <linux/poison.h> |
17a941d8 | 27 | #include <linux/dma-mapping.h> |
44df75e6 MT |
28 | #include <linux/module.h> |
29 | #include <linux/memory_hotplug.h> | |
1da177e4 LT |
30 | |
31 | #include <asm/processor.h> | |
32 | #include <asm/system.h> | |
33 | #include <asm/uaccess.h> | |
34 | #include <asm/pgtable.h> | |
35 | #include <asm/pgalloc.h> | |
36 | #include <asm/dma.h> | |
37 | #include <asm/fixmap.h> | |
38 | #include <asm/e820.h> | |
39 | #include <asm/apic.h> | |
40 | #include <asm/tlb.h> | |
41 | #include <asm/mmu_context.h> | |
42 | #include <asm/proto.h> | |
43 | #include <asm/smp.h> | |
2bc0414e | 44 | #include <asm/sections.h> |
1da177e4 LT |
45 | |
46 | #ifndef Dprintk | |
47 | #define Dprintk(x...) | |
48 | #endif | |
49 | ||
e6584504 | 50 | const struct dma_mapping_ops* dma_ops; |
17a941d8 MBY |
51 | EXPORT_SYMBOL(dma_ops); |
52 | ||
e18c6874 AK |
53 | static unsigned long dma_reserve __initdata; |
54 | ||
1da177e4 LT |
55 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); |
56 | ||
57 | /* | |
58 | * NOTE: pagetable_init alloc all the fixmap pagetables contiguous on the | |
59 | * physical space so we can cache the place of the first one and move | |
60 | * around without checking the pgd every time. | |
61 | */ | |
62 | ||
63 | void show_mem(void) | |
64 | { | |
e92343cc AK |
65 | long i, total = 0, reserved = 0; |
66 | long shared = 0, cached = 0; | |
1da177e4 LT |
67 | pg_data_t *pgdat; |
68 | struct page *page; | |
69 | ||
e92343cc | 70 | printk(KERN_INFO "Mem-info:\n"); |
1da177e4 | 71 | show_free_areas(); |
e92343cc | 72 | printk(KERN_INFO "Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); |
1da177e4 | 73 | |
ec936fc5 | 74 | for_each_online_pgdat(pgdat) { |
1da177e4 LT |
75 | for (i = 0; i < pgdat->node_spanned_pages; ++i) { |
76 | page = pfn_to_page(pgdat->node_start_pfn + i); | |
77 | total++; | |
e92343cc AK |
78 | if (PageReserved(page)) |
79 | reserved++; | |
80 | else if (PageSwapCache(page)) | |
81 | cached++; | |
82 | else if (page_count(page)) | |
83 | shared += page_count(page) - 1; | |
1da177e4 LT |
84 | } |
85 | } | |
e92343cc AK |
86 | printk(KERN_INFO "%lu pages of RAM\n", total); |
87 | printk(KERN_INFO "%lu reserved pages\n",reserved); | |
88 | printk(KERN_INFO "%lu pages shared\n",shared); | |
89 | printk(KERN_INFO "%lu pages swap cached\n",cached); | |
1da177e4 LT |
90 | } |
91 | ||
1da177e4 LT |
92 | int after_bootmem; |
93 | ||
5f44a669 | 94 | static __init void *spp_getpage(void) |
1da177e4 LT |
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 | ||
5f44a669 | 108 | static __init void set_pte_phys(unsigned long vaddr, |
1da177e4 LT |
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 */ | |
5f44a669 AK |
157 | void __init |
158 | __set_fixmap (enum fixed_addresses idx, unsigned long phys, pgprot_t prot) | |
1da177e4 LT |
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 | ||
dafe41ee | 171 | static __meminit void *alloc_low_page(unsigned long *phys) |
1da177e4 | 172 | { |
dafe41ee | 173 | unsigned long pfn = table_end++; |
1da177e4 LT |
174 | void *adr; |
175 | ||
44df75e6 MT |
176 | if (after_bootmem) { |
177 | adr = (void *)get_zeroed_page(GFP_ATOMIC); | |
178 | *phys = __pa(adr); | |
179 | return adr; | |
180 | } | |
181 | ||
1da177e4 LT |
182 | if (pfn >= end_pfn) |
183 | panic("alloc_low_page: ran out of memory"); | |
dafe41ee VG |
184 | |
185 | adr = early_ioremap(pfn * PAGE_SIZE, PAGE_SIZE); | |
44df75e6 | 186 | memset(adr, 0, PAGE_SIZE); |
dafe41ee VG |
187 | *phys = pfn * PAGE_SIZE; |
188 | return adr; | |
189 | } | |
1da177e4 | 190 | |
dafe41ee | 191 | static __meminit void unmap_low_page(void *adr) |
1da177e4 | 192 | { |
44df75e6 MT |
193 | |
194 | if (after_bootmem) | |
195 | return; | |
196 | ||
dafe41ee | 197 | early_iounmap(adr, PAGE_SIZE); |
1da177e4 LT |
198 | } |
199 | ||
f2d3efed AK |
200 | /* Must run before zap_low_mappings */ |
201 | __init void *early_ioremap(unsigned long addr, unsigned long size) | |
202 | { | |
dafe41ee VG |
203 | unsigned long vaddr; |
204 | pmd_t *pmd, *last_pmd; | |
205 | int i, pmds; | |
206 | ||
207 | pmds = ((addr & ~PMD_MASK) + size + ~PMD_MASK) / PMD_SIZE; | |
208 | vaddr = __START_KERNEL_map; | |
209 | pmd = level2_kernel_pgt; | |
210 | last_pmd = level2_kernel_pgt + PTRS_PER_PMD - 1; | |
211 | for (; pmd <= last_pmd; pmd++, vaddr += PMD_SIZE) { | |
212 | for (i = 0; i < pmds; i++) { | |
213 | if (pmd_present(pmd[i])) | |
214 | goto next; | |
215 | } | |
216 | vaddr += addr & ~PMD_MASK; | |
217 | addr &= PMD_MASK; | |
218 | for (i = 0; i < pmds; i++, addr += PMD_SIZE) | |
219 | set_pmd(pmd + i,__pmd(addr | _KERNPG_TABLE | _PAGE_PSE)); | |
220 | __flush_tlb(); | |
221 | return (void *)vaddr; | |
222 | next: | |
223 | ; | |
f2d3efed | 224 | } |
dafe41ee VG |
225 | printk("early_ioremap(0x%lx, %lu) failed\n", addr, size); |
226 | return NULL; | |
f2d3efed AK |
227 | } |
228 | ||
229 | /* To avoid virtual aliases later */ | |
230 | __init void early_iounmap(void *addr, unsigned long size) | |
231 | { | |
dafe41ee VG |
232 | unsigned long vaddr; |
233 | pmd_t *pmd; | |
234 | int i, pmds; | |
235 | ||
236 | vaddr = (unsigned long)addr; | |
237 | pmds = ((vaddr & ~PMD_MASK) + size + ~PMD_MASK) / PMD_SIZE; | |
238 | pmd = level2_kernel_pgt + pmd_index(vaddr); | |
239 | for (i = 0; i < pmds; i++) | |
240 | pmd_clear(pmd + i); | |
f2d3efed AK |
241 | __flush_tlb(); |
242 | } | |
243 | ||
44df75e6 | 244 | static void __meminit |
6ad91658 | 245 | phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end) |
44df75e6 | 246 | { |
6ad91658 | 247 | int i = pmd_index(address); |
44df75e6 | 248 | |
6ad91658 | 249 | for (; i < PTRS_PER_PMD; i++, address += PMD_SIZE) { |
44df75e6 | 250 | unsigned long entry; |
6ad91658 | 251 | pmd_t *pmd = pmd_page + pmd_index(address); |
44df75e6 | 252 | |
5f51e139 JB |
253 | if (address >= end) { |
254 | if (!after_bootmem) | |
255 | for (; i < PTRS_PER_PMD; i++, pmd++) | |
256 | set_pmd(pmd, __pmd(0)); | |
44df75e6 MT |
257 | break; |
258 | } | |
6ad91658 KM |
259 | |
260 | if (pmd_val(*pmd)) | |
261 | continue; | |
262 | ||
44df75e6 MT |
263 | entry = _PAGE_NX|_PAGE_PSE|_KERNPG_TABLE|_PAGE_GLOBAL|address; |
264 | entry &= __supported_pte_mask; | |
265 | set_pmd(pmd, __pmd(entry)); | |
266 | } | |
267 | } | |
268 | ||
269 | static void __meminit | |
270 | phys_pmd_update(pud_t *pud, unsigned long address, unsigned long end) | |
271 | { | |
6ad91658 KM |
272 | pmd_t *pmd = pmd_offset(pud,0); |
273 | spin_lock(&init_mm.page_table_lock); | |
274 | phys_pmd_init(pmd, address, end); | |
275 | spin_unlock(&init_mm.page_table_lock); | |
276 | __flush_tlb_all(); | |
44df75e6 MT |
277 | } |
278 | ||
6ad91658 | 279 | static void __meminit phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end) |
1da177e4 | 280 | { |
6ad91658 | 281 | int i = pud_index(addr); |
44df75e6 | 282 | |
44df75e6 | 283 | |
6ad91658 | 284 | for (; i < PTRS_PER_PUD; i++, addr = (addr & PUD_MASK) + PUD_SIZE ) { |
6ad91658 KM |
285 | unsigned long pmd_phys; |
286 | pud_t *pud = pud_page + pud_index(addr); | |
1da177e4 LT |
287 | pmd_t *pmd; |
288 | ||
6ad91658 | 289 | if (addr >= end) |
1da177e4 | 290 | break; |
1da177e4 | 291 | |
6ad91658 | 292 | if (!after_bootmem && !e820_any_mapped(addr,addr+PUD_SIZE,0)) { |
1da177e4 LT |
293 | set_pud(pud, __pud(0)); |
294 | continue; | |
295 | } | |
296 | ||
6ad91658 KM |
297 | if (pud_val(*pud)) { |
298 | phys_pmd_update(pud, addr, end); | |
299 | continue; | |
300 | } | |
301 | ||
dafe41ee | 302 | pmd = alloc_low_page(&pmd_phys); |
44df75e6 | 303 | spin_lock(&init_mm.page_table_lock); |
1da177e4 | 304 | set_pud(pud, __pud(pmd_phys | _KERNPG_TABLE)); |
6ad91658 | 305 | phys_pmd_init(pmd, addr, end); |
44df75e6 | 306 | spin_unlock(&init_mm.page_table_lock); |
dafe41ee | 307 | unmap_low_page(pmd); |
1da177e4 LT |
308 | } |
309 | __flush_tlb(); | |
310 | } | |
311 | ||
312 | static void __init find_early_table_space(unsigned long end) | |
313 | { | |
6c5acd16 | 314 | unsigned long puds, pmds, tables, start; |
1da177e4 LT |
315 | |
316 | puds = (end + PUD_SIZE - 1) >> PUD_SHIFT; | |
317 | pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT; | |
318 | tables = round_up(puds * sizeof(pud_t), PAGE_SIZE) + | |
319 | round_up(pmds * sizeof(pmd_t), PAGE_SIZE); | |
320 | ||
ee408c79 AK |
321 | /* RED-PEN putting page tables only on node 0 could |
322 | cause a hotspot and fill up ZONE_DMA. The page tables | |
323 | need roughly 0.5KB per GB. */ | |
324 | start = 0x8000; | |
325 | table_start = find_e820_area(start, end, tables); | |
1da177e4 LT |
326 | if (table_start == -1UL) |
327 | panic("Cannot find space for the kernel page tables"); | |
328 | ||
329 | table_start >>= PAGE_SHIFT; | |
330 | table_end = table_start; | |
44df75e6 MT |
331 | |
332 | early_printk("kernel direct mapping tables up to %lx @ %lx-%lx\n", | |
5f51e139 JB |
333 | end, table_start << PAGE_SHIFT, |
334 | (table_start << PAGE_SHIFT) + tables); | |
1da177e4 LT |
335 | } |
336 | ||
337 | /* Setup the direct mapping of the physical memory at PAGE_OFFSET. | |
338 | This runs before bootmem is initialized and gets pages directly from the | |
339 | physical memory. To access them they are temporarily mapped. */ | |
44df75e6 | 340 | void __meminit init_memory_mapping(unsigned long start, unsigned long end) |
1da177e4 LT |
341 | { |
342 | unsigned long next; | |
343 | ||
344 | Dprintk("init_memory_mapping\n"); | |
345 | ||
346 | /* | |
347 | * Find space for the kernel direct mapping tables. | |
348 | * Later we should allocate these tables in the local node of the memory | |
349 | * mapped. Unfortunately this is done currently before the nodes are | |
350 | * discovered. | |
351 | */ | |
44df75e6 MT |
352 | if (!after_bootmem) |
353 | find_early_table_space(end); | |
1da177e4 LT |
354 | |
355 | start = (unsigned long)__va(start); | |
356 | end = (unsigned long)__va(end); | |
357 | ||
358 | for (; start < end; start = next) { | |
1da177e4 | 359 | unsigned long pud_phys; |
44df75e6 MT |
360 | pgd_t *pgd = pgd_offset_k(start); |
361 | pud_t *pud; | |
362 | ||
363 | if (after_bootmem) | |
d2ae5b5f | 364 | pud = pud_offset(pgd, start & PGDIR_MASK); |
44df75e6 | 365 | else |
dafe41ee | 366 | pud = alloc_low_page(&pud_phys); |
44df75e6 | 367 | |
1da177e4 LT |
368 | next = start + PGDIR_SIZE; |
369 | if (next > end) | |
370 | next = end; | |
371 | phys_pud_init(pud, __pa(start), __pa(next)); | |
44df75e6 MT |
372 | if (!after_bootmem) |
373 | set_pgd(pgd_offset_k(start), mk_kernel_pgd(pud_phys)); | |
dafe41ee | 374 | unmap_low_page(pud); |
1da177e4 LT |
375 | } |
376 | ||
44df75e6 MT |
377 | if (!after_bootmem) |
378 | asm volatile("movq %%cr4,%0" : "=r" (mmu_cr4_features)); | |
1da177e4 | 379 | __flush_tlb_all(); |
1da177e4 LT |
380 | } |
381 | ||
2b97690f | 382 | #ifndef CONFIG_NUMA |
1da177e4 LT |
383 | void __init paging_init(void) |
384 | { | |
6391af17 MG |
385 | unsigned long max_zone_pfns[MAX_NR_ZONES]; |
386 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); | |
387 | max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN; | |
388 | max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN; | |
389 | max_zone_pfns[ZONE_NORMAL] = end_pfn; | |
390 | ||
44df75e6 MT |
391 | memory_present(0, 0, end_pfn); |
392 | sparse_init(); | |
5cb248ab | 393 | free_area_init_nodes(max_zone_pfns); |
1da177e4 LT |
394 | } |
395 | #endif | |
396 | ||
397 | /* Unmap a kernel mapping if it exists. This is useful to avoid prefetches | |
398 | from the CPU leading to inconsistent cache lines. address and size | |
399 | must be aligned to 2MB boundaries. | |
400 | Does nothing when the mapping doesn't exist. */ | |
401 | void __init clear_kernel_mapping(unsigned long address, unsigned long size) | |
402 | { | |
403 | unsigned long end = address + size; | |
404 | ||
405 | BUG_ON(address & ~LARGE_PAGE_MASK); | |
406 | BUG_ON(size & ~LARGE_PAGE_MASK); | |
407 | ||
408 | for (; address < end; address += LARGE_PAGE_SIZE) { | |
409 | pgd_t *pgd = pgd_offset_k(address); | |
410 | pud_t *pud; | |
411 | pmd_t *pmd; | |
412 | if (pgd_none(*pgd)) | |
413 | continue; | |
414 | pud = pud_offset(pgd, address); | |
415 | if (pud_none(*pud)) | |
416 | continue; | |
417 | pmd = pmd_offset(pud, address); | |
418 | if (!pmd || pmd_none(*pmd)) | |
419 | continue; | |
420 | if (0 == (pmd_val(*pmd) & _PAGE_PSE)) { | |
421 | /* Could handle this, but it should not happen currently. */ | |
422 | printk(KERN_ERR | |
423 | "clear_kernel_mapping: mapping has been split. will leak memory\n"); | |
424 | pmd_ERROR(*pmd); | |
425 | } | |
426 | set_pmd(pmd, __pmd(0)); | |
427 | } | |
428 | __flush_tlb_all(); | |
429 | } | |
430 | ||
44df75e6 MT |
431 | /* |
432 | * Memory hotplug specific functions | |
44df75e6 | 433 | */ |
44df75e6 MT |
434 | void online_page(struct page *page) |
435 | { | |
436 | ClearPageReserved(page); | |
7835e98b | 437 | init_page_count(page); |
44df75e6 MT |
438 | __free_page(page); |
439 | totalram_pages++; | |
440 | num_physpages++; | |
441 | } | |
442 | ||
bc02af93 | 443 | #ifdef CONFIG_MEMORY_HOTPLUG |
9d99aaa3 AK |
444 | /* |
445 | * Memory is added always to NORMAL zone. This means you will never get | |
446 | * additional DMA/DMA32 memory. | |
447 | */ | |
bc02af93 | 448 | int arch_add_memory(int nid, u64 start, u64 size) |
44df75e6 | 449 | { |
bc02af93 | 450 | struct pglist_data *pgdat = NODE_DATA(nid); |
776ed98b | 451 | struct zone *zone = pgdat->node_zones + ZONE_NORMAL; |
44df75e6 MT |
452 | unsigned long start_pfn = start >> PAGE_SHIFT; |
453 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
454 | int ret; | |
455 | ||
45e0b78b KM |
456 | init_memory_mapping(start, (start + size -1)); |
457 | ||
44df75e6 MT |
458 | ret = __add_pages(zone, start_pfn, nr_pages); |
459 | if (ret) | |
460 | goto error; | |
461 | ||
44df75e6 MT |
462 | return ret; |
463 | error: | |
464 | printk("%s: Problem encountered in __add_pages!\n", __func__); | |
465 | return ret; | |
466 | } | |
bc02af93 | 467 | EXPORT_SYMBOL_GPL(arch_add_memory); |
44df75e6 MT |
468 | |
469 | int remove_memory(u64 start, u64 size) | |
470 | { | |
471 | return -EINVAL; | |
472 | } | |
473 | EXPORT_SYMBOL_GPL(remove_memory); | |
474 | ||
8243229f | 475 | #if !defined(CONFIG_ACPI_NUMA) && defined(CONFIG_NUMA) |
4942e998 KM |
476 | int memory_add_physaddr_to_nid(u64 start) |
477 | { | |
478 | return 0; | |
479 | } | |
8c2676a5 | 480 | EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid); |
4942e998 KM |
481 | #endif |
482 | ||
45e0b78b KM |
483 | #endif /* CONFIG_MEMORY_HOTPLUG */ |
484 | ||
485 | #ifdef CONFIG_MEMORY_HOTPLUG_RESERVE | |
bc02af93 YG |
486 | /* |
487 | * Memory Hotadd without sparsemem. The mem_maps have been allocated in advance, | |
488 | * just online the pages. | |
489 | */ | |
490 | int __add_pages(struct zone *z, unsigned long start_pfn, unsigned long nr_pages) | |
491 | { | |
492 | int err = -EIO; | |
493 | unsigned long pfn; | |
494 | unsigned long total = 0, mem = 0; | |
495 | for (pfn = start_pfn; pfn < start_pfn + nr_pages; pfn++) { | |
496 | if (pfn_valid(pfn)) { | |
497 | online_page(pfn_to_page(pfn)); | |
498 | err = 0; | |
499 | mem++; | |
500 | } | |
501 | total++; | |
502 | } | |
503 | if (!err) { | |
504 | z->spanned_pages += total; | |
505 | z->present_pages += mem; | |
506 | z->zone_pgdat->node_spanned_pages += total; | |
507 | z->zone_pgdat->node_present_pages += mem; | |
508 | } | |
509 | return err; | |
510 | } | |
45e0b78b | 511 | #endif |
44df75e6 | 512 | |
1da177e4 LT |
513 | static struct kcore_list kcore_mem, kcore_vmalloc, kcore_kernel, kcore_modules, |
514 | kcore_vsyscall; | |
515 | ||
516 | void __init mem_init(void) | |
517 | { | |
0a43e4bf | 518 | long codesize, reservedpages, datasize, initsize; |
1da177e4 | 519 | |
0dc243ae | 520 | pci_iommu_alloc(); |
1da177e4 | 521 | |
1da177e4 LT |
522 | /* clear the zero-page */ |
523 | memset(empty_zero_page, 0, PAGE_SIZE); | |
524 | ||
525 | reservedpages = 0; | |
526 | ||
527 | /* this will put all low memory onto the freelists */ | |
2b97690f | 528 | #ifdef CONFIG_NUMA |
0a43e4bf | 529 | totalram_pages = numa_free_all_bootmem(); |
1da177e4 | 530 | #else |
0a43e4bf | 531 | totalram_pages = free_all_bootmem(); |
1da177e4 | 532 | #endif |
5cb248ab MG |
533 | reservedpages = end_pfn - totalram_pages - |
534 | absent_pages_in_range(0, end_pfn); | |
1da177e4 LT |
535 | |
536 | after_bootmem = 1; | |
537 | ||
538 | codesize = (unsigned long) &_etext - (unsigned long) &_text; | |
539 | datasize = (unsigned long) &_edata - (unsigned long) &_etext; | |
540 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; | |
541 | ||
542 | /* Register memory areas for /proc/kcore */ | |
543 | kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT); | |
544 | kclist_add(&kcore_vmalloc, (void *)VMALLOC_START, | |
545 | VMALLOC_END-VMALLOC_START); | |
546 | kclist_add(&kcore_kernel, &_stext, _end - _stext); | |
547 | kclist_add(&kcore_modules, (void *)MODULES_VADDR, MODULES_LEN); | |
548 | kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START, | |
549 | VSYSCALL_END - VSYSCALL_START); | |
550 | ||
0a43e4bf | 551 | printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n", |
1da177e4 LT |
552 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), |
553 | end_pfn << (PAGE_SHIFT-10), | |
554 | codesize >> 10, | |
555 | reservedpages << (PAGE_SHIFT-10), | |
556 | datasize >> 10, | |
557 | initsize >> 10); | |
1da177e4 LT |
558 | } |
559 | ||
d167a518 | 560 | void free_init_pages(char *what, unsigned long begin, unsigned long end) |
1da177e4 LT |
561 | { |
562 | unsigned long addr; | |
563 | ||
d167a518 GH |
564 | if (begin >= end) |
565 | return; | |
566 | ||
6fb14755 | 567 | printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10); |
d167a518 | 568 | for (addr = begin; addr < end; addr += PAGE_SIZE) { |
0dbf7028 VG |
569 | struct page *page = pfn_to_page(addr >> PAGE_SHIFT); |
570 | ClearPageReserved(page); | |
571 | init_page_count(page); | |
572 | memset(page_address(page), POISON_FREE_INITMEM, PAGE_SIZE); | |
6fb14755 JB |
573 | if (addr >= __START_KERNEL_map) |
574 | change_page_attr_addr(addr, 1, __pgprot(0)); | |
0dbf7028 | 575 | __free_page(page); |
1da177e4 LT |
576 | totalram_pages++; |
577 | } | |
6fb14755 JB |
578 | if (addr > __START_KERNEL_map) |
579 | global_flush_tlb(); | |
d167a518 GH |
580 | } |
581 | ||
582 | void free_initmem(void) | |
583 | { | |
d167a518 | 584 | free_init_pages("unused kernel memory", |
0dbf7028 VG |
585 | __pa_symbol(&__init_begin), |
586 | __pa_symbol(&__init_end)); | |
1da177e4 LT |
587 | } |
588 | ||
67df197b AV |
589 | #ifdef CONFIG_DEBUG_RODATA |
590 | ||
67df197b AV |
591 | void mark_rodata_ro(void) |
592 | { | |
6fb14755 | 593 | unsigned long start = PFN_ALIGN(__va(__pa_symbol(&_stext))), size; |
67df197b | 594 | |
6fb14755 JB |
595 | #ifdef CONFIG_HOTPLUG_CPU |
596 | /* It must still be possible to apply SMP alternatives. */ | |
597 | if (num_possible_cpus() > 1) | |
598 | start = PFN_ALIGN(__va(__pa_symbol(&_etext))); | |
599 | #endif | |
600 | size = (unsigned long)__va(__pa_symbol(&__end_rodata)) - start; | |
601 | change_page_attr_addr(start, size >> PAGE_SHIFT, PAGE_KERNEL_RO); | |
67df197b | 602 | |
6fb14755 JB |
603 | printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n", |
604 | size >> 10); | |
67df197b AV |
605 | |
606 | /* | |
607 | * change_page_attr_addr() requires a global_flush_tlb() call after it. | |
608 | * We do this after the printk so that if something went wrong in the | |
609 | * change, the printk gets out at least to give a better debug hint | |
610 | * of who is the culprit. | |
611 | */ | |
612 | global_flush_tlb(); | |
613 | } | |
614 | #endif | |
615 | ||
1da177e4 LT |
616 | #ifdef CONFIG_BLK_DEV_INITRD |
617 | void free_initrd_mem(unsigned long start, unsigned long end) | |
618 | { | |
0dbf7028 | 619 | free_init_pages("initrd memory", __pa(start), __pa(end)); |
1da177e4 LT |
620 | } |
621 | #endif | |
622 | ||
623 | void __init reserve_bootmem_generic(unsigned long phys, unsigned len) | |
624 | { | |
2b97690f | 625 | #ifdef CONFIG_NUMA |
1da177e4 | 626 | int nid = phys_to_nid(phys); |
5e58a02a AK |
627 | #endif |
628 | unsigned long pfn = phys >> PAGE_SHIFT; | |
629 | if (pfn >= end_pfn) { | |
630 | /* This can happen with kdump kernels when accessing firmware | |
631 | tables. */ | |
632 | if (pfn < end_pfn_map) | |
633 | return; | |
634 | printk(KERN_ERR "reserve_bootmem: illegal reserve %lx %u\n", | |
635 | phys, len); | |
636 | return; | |
637 | } | |
638 | ||
639 | /* Should check here against the e820 map to avoid double free */ | |
640 | #ifdef CONFIG_NUMA | |
1da177e4 LT |
641 | reserve_bootmem_node(NODE_DATA(nid), phys, len); |
642 | #else | |
643 | reserve_bootmem(phys, len); | |
644 | #endif | |
0e0b864e | 645 | if (phys+len <= MAX_DMA_PFN*PAGE_SIZE) { |
e18c6874 | 646 | dma_reserve += len / PAGE_SIZE; |
0e0b864e MG |
647 | set_dma_reserve(dma_reserve); |
648 | } | |
1da177e4 LT |
649 | } |
650 | ||
651 | int kern_addr_valid(unsigned long addr) | |
652 | { | |
653 | unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT; | |
654 | pgd_t *pgd; | |
655 | pud_t *pud; | |
656 | pmd_t *pmd; | |
657 | pte_t *pte; | |
658 | ||
659 | if (above != 0 && above != -1UL) | |
660 | return 0; | |
661 | ||
662 | pgd = pgd_offset_k(addr); | |
663 | if (pgd_none(*pgd)) | |
664 | return 0; | |
665 | ||
666 | pud = pud_offset(pgd, addr); | |
667 | if (pud_none(*pud)) | |
668 | return 0; | |
669 | ||
670 | pmd = pmd_offset(pud, addr); | |
671 | if (pmd_none(*pmd)) | |
672 | return 0; | |
673 | if (pmd_large(*pmd)) | |
674 | return pfn_valid(pmd_pfn(*pmd)); | |
675 | ||
676 | pte = pte_offset_kernel(pmd, addr); | |
677 | if (pte_none(*pte)) | |
678 | return 0; | |
679 | return pfn_valid(pte_pfn(*pte)); | |
680 | } | |
681 | ||
682 | #ifdef CONFIG_SYSCTL | |
683 | #include <linux/sysctl.h> | |
684 | ||
685 | extern int exception_trace, page_fault_trace; | |
686 | ||
687 | static ctl_table debug_table2[] = { | |
c37ce032 EB |
688 | { |
689 | .ctl_name = 99, | |
690 | .procname = "exception-trace", | |
691 | .data = &exception_trace, | |
692 | .maxlen = sizeof(int), | |
693 | .mode = 0644, | |
694 | .proc_handler = proc_dointvec | |
695 | }, | |
696 | {} | |
1da177e4 LT |
697 | }; |
698 | ||
699 | static ctl_table debug_root_table2[] = { | |
c37ce032 EB |
700 | { |
701 | .ctl_name = CTL_DEBUG, | |
702 | .procname = "debug", | |
703 | .mode = 0555, | |
704 | .child = debug_table2 | |
705 | }, | |
706 | {} | |
1da177e4 LT |
707 | }; |
708 | ||
709 | static __init int x8664_sysctl_init(void) | |
710 | { | |
0b4d4147 | 711 | register_sysctl_table(debug_root_table2); |
1da177e4 LT |
712 | return 0; |
713 | } | |
714 | __initcall(x8664_sysctl_init); | |
715 | #endif | |
716 | ||
103efcd9 | 717 | /* A pseudo VMA to allow ptrace access for the vsyscall page. This only |
1e014410 AK |
718 | covers the 64bit vsyscall page now. 32bit has a real VMA now and does |
719 | not need special handling anymore. */ | |
1da177e4 LT |
720 | |
721 | static struct vm_area_struct gate_vma = { | |
722 | .vm_start = VSYSCALL_START, | |
103efcd9 EP |
723 | .vm_end = VSYSCALL_START + (VSYSCALL_MAPPED_PAGES << PAGE_SHIFT), |
724 | .vm_page_prot = PAGE_READONLY_EXEC, | |
725 | .vm_flags = VM_READ | VM_EXEC | |
1da177e4 LT |
726 | }; |
727 | ||
1da177e4 LT |
728 | struct vm_area_struct *get_gate_vma(struct task_struct *tsk) |
729 | { | |
730 | #ifdef CONFIG_IA32_EMULATION | |
1e014410 AK |
731 | if (test_tsk_thread_flag(tsk, TIF_IA32)) |
732 | return NULL; | |
1da177e4 LT |
733 | #endif |
734 | return &gate_vma; | |
735 | } | |
736 | ||
737 | int in_gate_area(struct task_struct *task, unsigned long addr) | |
738 | { | |
739 | struct vm_area_struct *vma = get_gate_vma(task); | |
1e014410 AK |
740 | if (!vma) |
741 | return 0; | |
1da177e4 LT |
742 | return (addr >= vma->vm_start) && (addr < vma->vm_end); |
743 | } | |
744 | ||
745 | /* Use this when you have no reliable task/vma, typically from interrupt | |
746 | * context. It is less reliable than using the task's vma and may give | |
747 | * false positives. | |
748 | */ | |
749 | int in_gate_area_no_task(unsigned long addr) | |
750 | { | |
1e014410 | 751 | return (addr >= VSYSCALL_START) && (addr < VSYSCALL_END); |
1da177e4 | 752 | } |