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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> | |
ae32b129 | 30 | #include <linux/nmi.h> |
1da177e4 LT |
31 | |
32 | #include <asm/processor.h> | |
33 | #include <asm/system.h> | |
34 | #include <asm/uaccess.h> | |
35 | #include <asm/pgtable.h> | |
36 | #include <asm/pgalloc.h> | |
37 | #include <asm/dma.h> | |
38 | #include <asm/fixmap.h> | |
39 | #include <asm/e820.h> | |
40 | #include <asm/apic.h> | |
41 | #include <asm/tlb.h> | |
42 | #include <asm/mmu_context.h> | |
43 | #include <asm/proto.h> | |
44 | #include <asm/smp.h> | |
2bc0414e | 45 | #include <asm/sections.h> |
718fc13b | 46 | #include <asm/kdebug.h> |
aaa64e04 | 47 | #include <asm/numa.h> |
1da177e4 LT |
48 | |
49 | #ifndef Dprintk | |
50 | #define Dprintk(x...) | |
51 | #endif | |
52 | ||
e6584504 | 53 | const struct dma_mapping_ops* dma_ops; |
17a941d8 MBY |
54 | EXPORT_SYMBOL(dma_ops); |
55 | ||
e18c6874 AK |
56 | static unsigned long dma_reserve __initdata; |
57 | ||
1da177e4 LT |
58 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); |
59 | ||
60 | /* | |
61 | * NOTE: pagetable_init alloc all the fixmap pagetables contiguous on the | |
62 | * physical space so we can cache the place of the first one and move | |
63 | * around without checking the pgd every time. | |
64 | */ | |
65 | ||
66 | void show_mem(void) | |
67 | { | |
e92343cc AK |
68 | long i, total = 0, reserved = 0; |
69 | long shared = 0, cached = 0; | |
1da177e4 LT |
70 | pg_data_t *pgdat; |
71 | struct page *page; | |
72 | ||
e92343cc | 73 | printk(KERN_INFO "Mem-info:\n"); |
1da177e4 | 74 | show_free_areas(); |
e92343cc | 75 | printk(KERN_INFO "Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); |
1da177e4 | 76 | |
ec936fc5 | 77 | for_each_online_pgdat(pgdat) { |
1da177e4 | 78 | for (i = 0; i < pgdat->node_spanned_pages; ++i) { |
ae32b129 KR |
79 | /* this loop can take a while with 256 GB and 4k pages |
80 | so update the NMI watchdog */ | |
81 | if (unlikely(i % MAX_ORDER_NR_PAGES == 0)) { | |
82 | touch_nmi_watchdog(); | |
83 | } | |
12710a56 BP |
84 | if (!pfn_valid(pgdat->node_start_pfn + i)) |
85 | continue; | |
1da177e4 LT |
86 | page = pfn_to_page(pgdat->node_start_pfn + i); |
87 | total++; | |
e92343cc AK |
88 | if (PageReserved(page)) |
89 | reserved++; | |
90 | else if (PageSwapCache(page)) | |
91 | cached++; | |
92 | else if (page_count(page)) | |
93 | shared += page_count(page) - 1; | |
1da177e4 LT |
94 | } |
95 | } | |
e92343cc AK |
96 | printk(KERN_INFO "%lu pages of RAM\n", total); |
97 | printk(KERN_INFO "%lu reserved pages\n",reserved); | |
98 | printk(KERN_INFO "%lu pages shared\n",shared); | |
99 | printk(KERN_INFO "%lu pages swap cached\n",cached); | |
1da177e4 LT |
100 | } |
101 | ||
1da177e4 LT |
102 | int after_bootmem; |
103 | ||
5f44a669 | 104 | static __init void *spp_getpage(void) |
1da177e4 LT |
105 | { |
106 | void *ptr; | |
107 | if (after_bootmem) | |
108 | ptr = (void *) get_zeroed_page(GFP_ATOMIC); | |
109 | else | |
110 | ptr = alloc_bootmem_pages(PAGE_SIZE); | |
111 | if (!ptr || ((unsigned long)ptr & ~PAGE_MASK)) | |
112 | panic("set_pte_phys: cannot allocate page data %s\n", after_bootmem?"after bootmem":""); | |
113 | ||
114 | Dprintk("spp_getpage %p\n", ptr); | |
115 | return ptr; | |
116 | } | |
117 | ||
5f44a669 | 118 | static __init void set_pte_phys(unsigned long vaddr, |
1da177e4 LT |
119 | unsigned long phys, pgprot_t prot) |
120 | { | |
121 | pgd_t *pgd; | |
122 | pud_t *pud; | |
123 | pmd_t *pmd; | |
124 | pte_t *pte, new_pte; | |
125 | ||
126 | Dprintk("set_pte_phys %lx to %lx\n", vaddr, phys); | |
127 | ||
128 | pgd = pgd_offset_k(vaddr); | |
129 | if (pgd_none(*pgd)) { | |
130 | printk("PGD FIXMAP MISSING, it should be setup in head.S!\n"); | |
131 | return; | |
132 | } | |
133 | pud = pud_offset(pgd, vaddr); | |
134 | if (pud_none(*pud)) { | |
135 | pmd = (pmd_t *) spp_getpage(); | |
136 | set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE | _PAGE_USER)); | |
137 | if (pmd != pmd_offset(pud, 0)) { | |
138 | printk("PAGETABLE BUG #01! %p <-> %p\n", pmd, pmd_offset(pud,0)); | |
139 | return; | |
140 | } | |
141 | } | |
142 | pmd = pmd_offset(pud, vaddr); | |
143 | if (pmd_none(*pmd)) { | |
144 | pte = (pte_t *) spp_getpage(); | |
145 | set_pmd(pmd, __pmd(__pa(pte) | _KERNPG_TABLE | _PAGE_USER)); | |
146 | if (pte != pte_offset_kernel(pmd, 0)) { | |
147 | printk("PAGETABLE BUG #02!\n"); | |
148 | return; | |
149 | } | |
150 | } | |
151 | new_pte = pfn_pte(phys >> PAGE_SHIFT, prot); | |
152 | ||
153 | pte = pte_offset_kernel(pmd, vaddr); | |
154 | if (!pte_none(*pte) && | |
155 | pte_val(*pte) != (pte_val(new_pte) & __supported_pte_mask)) | |
156 | pte_ERROR(*pte); | |
157 | set_pte(pte, new_pte); | |
158 | ||
159 | /* | |
160 | * It's enough to flush this one mapping. | |
161 | * (PGE mappings get flushed as well) | |
162 | */ | |
163 | __flush_tlb_one(vaddr); | |
164 | } | |
165 | ||
166 | /* NOTE: this is meant to be run only at boot */ | |
5f44a669 AK |
167 | void __init |
168 | __set_fixmap (enum fixed_addresses idx, unsigned long phys, pgprot_t prot) | |
1da177e4 LT |
169 | { |
170 | unsigned long address = __fix_to_virt(idx); | |
171 | ||
172 | if (idx >= __end_of_fixed_addresses) { | |
173 | printk("Invalid __set_fixmap\n"); | |
174 | return; | |
175 | } | |
176 | set_pte_phys(address, phys, prot); | |
177 | } | |
178 | ||
a3142c8e | 179 | unsigned long __meminitdata table_start, table_end; |
1da177e4 | 180 | |
dafe41ee | 181 | static __meminit void *alloc_low_page(unsigned long *phys) |
1da177e4 | 182 | { |
dafe41ee | 183 | unsigned long pfn = table_end++; |
1da177e4 LT |
184 | void *adr; |
185 | ||
44df75e6 MT |
186 | if (after_bootmem) { |
187 | adr = (void *)get_zeroed_page(GFP_ATOMIC); | |
188 | *phys = __pa(adr); | |
189 | return adr; | |
190 | } | |
191 | ||
1da177e4 LT |
192 | if (pfn >= end_pfn) |
193 | panic("alloc_low_page: ran out of memory"); | |
dafe41ee VG |
194 | |
195 | adr = early_ioremap(pfn * PAGE_SIZE, PAGE_SIZE); | |
44df75e6 | 196 | memset(adr, 0, PAGE_SIZE); |
dafe41ee VG |
197 | *phys = pfn * PAGE_SIZE; |
198 | return adr; | |
199 | } | |
1da177e4 | 200 | |
dafe41ee | 201 | static __meminit void unmap_low_page(void *adr) |
1da177e4 | 202 | { |
44df75e6 MT |
203 | |
204 | if (after_bootmem) | |
205 | return; | |
206 | ||
dafe41ee | 207 | early_iounmap(adr, PAGE_SIZE); |
1da177e4 LT |
208 | } |
209 | ||
f2d3efed | 210 | /* Must run before zap_low_mappings */ |
a3142c8e | 211 | __meminit void *early_ioremap(unsigned long addr, unsigned long size) |
f2d3efed | 212 | { |
dafe41ee VG |
213 | unsigned long vaddr; |
214 | pmd_t *pmd, *last_pmd; | |
215 | int i, pmds; | |
216 | ||
217 | pmds = ((addr & ~PMD_MASK) + size + ~PMD_MASK) / PMD_SIZE; | |
218 | vaddr = __START_KERNEL_map; | |
219 | pmd = level2_kernel_pgt; | |
220 | last_pmd = level2_kernel_pgt + PTRS_PER_PMD - 1; | |
221 | for (; pmd <= last_pmd; pmd++, vaddr += PMD_SIZE) { | |
222 | for (i = 0; i < pmds; i++) { | |
223 | if (pmd_present(pmd[i])) | |
224 | goto next; | |
225 | } | |
226 | vaddr += addr & ~PMD_MASK; | |
227 | addr &= PMD_MASK; | |
228 | for (i = 0; i < pmds; i++, addr += PMD_SIZE) | |
929fd589 | 229 | set_pmd(pmd+i, __pmd(addr | __PAGE_KERNEL_LARGE_EXEC)); |
dafe41ee VG |
230 | __flush_tlb(); |
231 | return (void *)vaddr; | |
232 | next: | |
233 | ; | |
f2d3efed | 234 | } |
dafe41ee VG |
235 | printk("early_ioremap(0x%lx, %lu) failed\n", addr, size); |
236 | return NULL; | |
f2d3efed AK |
237 | } |
238 | ||
239 | /* To avoid virtual aliases later */ | |
a3142c8e | 240 | __meminit void early_iounmap(void *addr, unsigned long size) |
f2d3efed | 241 | { |
dafe41ee VG |
242 | unsigned long vaddr; |
243 | pmd_t *pmd; | |
244 | int i, pmds; | |
245 | ||
246 | vaddr = (unsigned long)addr; | |
247 | pmds = ((vaddr & ~PMD_MASK) + size + ~PMD_MASK) / PMD_SIZE; | |
248 | pmd = level2_kernel_pgt + pmd_index(vaddr); | |
249 | for (i = 0; i < pmds; i++) | |
250 | pmd_clear(pmd + i); | |
f2d3efed AK |
251 | __flush_tlb(); |
252 | } | |
253 | ||
44df75e6 | 254 | static void __meminit |
6ad91658 | 255 | phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end) |
44df75e6 | 256 | { |
6ad91658 | 257 | int i = pmd_index(address); |
44df75e6 | 258 | |
6ad91658 | 259 | for (; i < PTRS_PER_PMD; i++, address += PMD_SIZE) { |
44df75e6 | 260 | unsigned long entry; |
6ad91658 | 261 | pmd_t *pmd = pmd_page + pmd_index(address); |
44df75e6 | 262 | |
5f51e139 JB |
263 | if (address >= end) { |
264 | if (!after_bootmem) | |
265 | for (; i < PTRS_PER_PMD; i++, pmd++) | |
266 | set_pmd(pmd, __pmd(0)); | |
44df75e6 MT |
267 | break; |
268 | } | |
6ad91658 KM |
269 | |
270 | if (pmd_val(*pmd)) | |
271 | continue; | |
272 | ||
40842bf5 | 273 | entry = __PAGE_KERNEL_LARGE|_PAGE_GLOBAL|address; |
44df75e6 MT |
274 | entry &= __supported_pte_mask; |
275 | set_pmd(pmd, __pmd(entry)); | |
276 | } | |
277 | } | |
278 | ||
279 | static void __meminit | |
280 | phys_pmd_update(pud_t *pud, unsigned long address, unsigned long end) | |
281 | { | |
6ad91658 KM |
282 | pmd_t *pmd = pmd_offset(pud,0); |
283 | spin_lock(&init_mm.page_table_lock); | |
284 | phys_pmd_init(pmd, address, end); | |
285 | spin_unlock(&init_mm.page_table_lock); | |
286 | __flush_tlb_all(); | |
44df75e6 MT |
287 | } |
288 | ||
6ad91658 | 289 | static void __meminit phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end) |
1da177e4 | 290 | { |
6ad91658 | 291 | int i = pud_index(addr); |
44df75e6 | 292 | |
44df75e6 | 293 | |
6ad91658 | 294 | for (; i < PTRS_PER_PUD; i++, addr = (addr & PUD_MASK) + PUD_SIZE ) { |
6ad91658 KM |
295 | unsigned long pmd_phys; |
296 | pud_t *pud = pud_page + pud_index(addr); | |
1da177e4 LT |
297 | pmd_t *pmd; |
298 | ||
6ad91658 | 299 | if (addr >= end) |
1da177e4 | 300 | break; |
1da177e4 | 301 | |
6ad91658 | 302 | if (!after_bootmem && !e820_any_mapped(addr,addr+PUD_SIZE,0)) { |
1da177e4 LT |
303 | set_pud(pud, __pud(0)); |
304 | continue; | |
305 | } | |
306 | ||
6ad91658 KM |
307 | if (pud_val(*pud)) { |
308 | phys_pmd_update(pud, addr, end); | |
309 | continue; | |
310 | } | |
311 | ||
dafe41ee | 312 | pmd = alloc_low_page(&pmd_phys); |
44df75e6 | 313 | spin_lock(&init_mm.page_table_lock); |
1da177e4 | 314 | set_pud(pud, __pud(pmd_phys | _KERNPG_TABLE)); |
6ad91658 | 315 | phys_pmd_init(pmd, addr, end); |
44df75e6 | 316 | spin_unlock(&init_mm.page_table_lock); |
dafe41ee | 317 | unmap_low_page(pmd); |
1da177e4 LT |
318 | } |
319 | __flush_tlb(); | |
320 | } | |
321 | ||
322 | static void __init find_early_table_space(unsigned long end) | |
323 | { | |
6c5acd16 | 324 | unsigned long puds, pmds, tables, start; |
1da177e4 LT |
325 | |
326 | puds = (end + PUD_SIZE - 1) >> PUD_SHIFT; | |
327 | pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT; | |
328 | tables = round_up(puds * sizeof(pud_t), PAGE_SIZE) + | |
329 | round_up(pmds * sizeof(pmd_t), PAGE_SIZE); | |
330 | ||
ee408c79 AK |
331 | /* RED-PEN putting page tables only on node 0 could |
332 | cause a hotspot and fill up ZONE_DMA. The page tables | |
333 | need roughly 0.5KB per GB. */ | |
334 | start = 0x8000; | |
335 | table_start = find_e820_area(start, end, tables); | |
1da177e4 LT |
336 | if (table_start == -1UL) |
337 | panic("Cannot find space for the kernel page tables"); | |
338 | ||
339 | table_start >>= PAGE_SHIFT; | |
340 | table_end = table_start; | |
44df75e6 MT |
341 | |
342 | early_printk("kernel direct mapping tables up to %lx @ %lx-%lx\n", | |
5f51e139 JB |
343 | end, table_start << PAGE_SHIFT, |
344 | (table_start << PAGE_SHIFT) + tables); | |
1da177e4 LT |
345 | } |
346 | ||
347 | /* Setup the direct mapping of the physical memory at PAGE_OFFSET. | |
348 | This runs before bootmem is initialized and gets pages directly from the | |
349 | physical memory. To access them they are temporarily mapped. */ | |
b6fd6ecb | 350 | void __init_refok init_memory_mapping(unsigned long start, unsigned long end) |
1da177e4 LT |
351 | { |
352 | unsigned long next; | |
353 | ||
354 | Dprintk("init_memory_mapping\n"); | |
355 | ||
356 | /* | |
357 | * Find space for the kernel direct mapping tables. | |
358 | * Later we should allocate these tables in the local node of the memory | |
359 | * mapped. Unfortunately this is done currently before the nodes are | |
360 | * discovered. | |
361 | */ | |
44df75e6 MT |
362 | if (!after_bootmem) |
363 | find_early_table_space(end); | |
1da177e4 LT |
364 | |
365 | start = (unsigned long)__va(start); | |
366 | end = (unsigned long)__va(end); | |
367 | ||
368 | for (; start < end; start = next) { | |
1da177e4 | 369 | unsigned long pud_phys; |
44df75e6 MT |
370 | pgd_t *pgd = pgd_offset_k(start); |
371 | pud_t *pud; | |
372 | ||
373 | if (after_bootmem) | |
d2ae5b5f | 374 | pud = pud_offset(pgd, start & PGDIR_MASK); |
44df75e6 | 375 | else |
dafe41ee | 376 | pud = alloc_low_page(&pud_phys); |
44df75e6 | 377 | |
1da177e4 LT |
378 | next = start + PGDIR_SIZE; |
379 | if (next > end) | |
380 | next = end; | |
381 | phys_pud_init(pud, __pa(start), __pa(next)); | |
44df75e6 MT |
382 | if (!after_bootmem) |
383 | set_pgd(pgd_offset_k(start), mk_kernel_pgd(pud_phys)); | |
dafe41ee | 384 | unmap_low_page(pud); |
1da177e4 LT |
385 | } |
386 | ||
44df75e6 | 387 | if (!after_bootmem) |
f51c9452 | 388 | mmu_cr4_features = read_cr4(); |
1da177e4 | 389 | __flush_tlb_all(); |
1da177e4 LT |
390 | } |
391 | ||
2b97690f | 392 | #ifndef CONFIG_NUMA |
1da177e4 LT |
393 | void __init paging_init(void) |
394 | { | |
6391af17 MG |
395 | unsigned long max_zone_pfns[MAX_NR_ZONES]; |
396 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); | |
397 | max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN; | |
398 | max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN; | |
399 | max_zone_pfns[ZONE_NORMAL] = end_pfn; | |
400 | ||
44df75e6 MT |
401 | memory_present(0, 0, end_pfn); |
402 | sparse_init(); | |
5cb248ab | 403 | free_area_init_nodes(max_zone_pfns); |
1da177e4 LT |
404 | } |
405 | #endif | |
406 | ||
407 | /* Unmap a kernel mapping if it exists. This is useful to avoid prefetches | |
408 | from the CPU leading to inconsistent cache lines. address and size | |
409 | must be aligned to 2MB boundaries. | |
410 | Does nothing when the mapping doesn't exist. */ | |
411 | void __init clear_kernel_mapping(unsigned long address, unsigned long size) | |
412 | { | |
413 | unsigned long end = address + size; | |
414 | ||
415 | BUG_ON(address & ~LARGE_PAGE_MASK); | |
416 | BUG_ON(size & ~LARGE_PAGE_MASK); | |
417 | ||
418 | for (; address < end; address += LARGE_PAGE_SIZE) { | |
419 | pgd_t *pgd = pgd_offset_k(address); | |
420 | pud_t *pud; | |
421 | pmd_t *pmd; | |
422 | if (pgd_none(*pgd)) | |
423 | continue; | |
424 | pud = pud_offset(pgd, address); | |
425 | if (pud_none(*pud)) | |
426 | continue; | |
427 | pmd = pmd_offset(pud, address); | |
428 | if (!pmd || pmd_none(*pmd)) | |
429 | continue; | |
430 | if (0 == (pmd_val(*pmd) & _PAGE_PSE)) { | |
431 | /* Could handle this, but it should not happen currently. */ | |
432 | printk(KERN_ERR | |
433 | "clear_kernel_mapping: mapping has been split. will leak memory\n"); | |
434 | pmd_ERROR(*pmd); | |
435 | } | |
436 | set_pmd(pmd, __pmd(0)); | |
437 | } | |
438 | __flush_tlb_all(); | |
439 | } | |
440 | ||
44df75e6 MT |
441 | /* |
442 | * Memory hotplug specific functions | |
44df75e6 | 443 | */ |
44df75e6 MT |
444 | void online_page(struct page *page) |
445 | { | |
446 | ClearPageReserved(page); | |
7835e98b | 447 | init_page_count(page); |
44df75e6 MT |
448 | __free_page(page); |
449 | totalram_pages++; | |
450 | num_physpages++; | |
451 | } | |
452 | ||
bc02af93 | 453 | #ifdef CONFIG_MEMORY_HOTPLUG |
9d99aaa3 AK |
454 | /* |
455 | * Memory is added always to NORMAL zone. This means you will never get | |
456 | * additional DMA/DMA32 memory. | |
457 | */ | |
bc02af93 | 458 | int arch_add_memory(int nid, u64 start, u64 size) |
44df75e6 | 459 | { |
bc02af93 | 460 | struct pglist_data *pgdat = NODE_DATA(nid); |
776ed98b | 461 | struct zone *zone = pgdat->node_zones + ZONE_NORMAL; |
44df75e6 MT |
462 | unsigned long start_pfn = start >> PAGE_SHIFT; |
463 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
464 | int ret; | |
465 | ||
45e0b78b KM |
466 | init_memory_mapping(start, (start + size -1)); |
467 | ||
44df75e6 MT |
468 | ret = __add_pages(zone, start_pfn, nr_pages); |
469 | if (ret) | |
470 | goto error; | |
471 | ||
44df75e6 MT |
472 | return ret; |
473 | error: | |
474 | printk("%s: Problem encountered in __add_pages!\n", __func__); | |
475 | return ret; | |
476 | } | |
bc02af93 | 477 | EXPORT_SYMBOL_GPL(arch_add_memory); |
44df75e6 | 478 | |
8243229f | 479 | #if !defined(CONFIG_ACPI_NUMA) && defined(CONFIG_NUMA) |
4942e998 KM |
480 | int memory_add_physaddr_to_nid(u64 start) |
481 | { | |
482 | return 0; | |
483 | } | |
8c2676a5 | 484 | EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid); |
4942e998 KM |
485 | #endif |
486 | ||
45e0b78b KM |
487 | #endif /* CONFIG_MEMORY_HOTPLUG */ |
488 | ||
1da177e4 LT |
489 | static struct kcore_list kcore_mem, kcore_vmalloc, kcore_kernel, kcore_modules, |
490 | kcore_vsyscall; | |
491 | ||
492 | void __init mem_init(void) | |
493 | { | |
0a43e4bf | 494 | long codesize, reservedpages, datasize, initsize; |
1da177e4 | 495 | |
0dc243ae | 496 | pci_iommu_alloc(); |
1da177e4 | 497 | |
48ddb154 | 498 | /* clear_bss() already clear the empty_zero_page */ |
1da177e4 | 499 | |
f2633105 IM |
500 | /* temporary debugging - double check it's true: */ |
501 | { | |
502 | int i; | |
503 | ||
504 | for (i = 0; i < 1024; i++) | |
505 | WARN_ON_ONCE(empty_zero_page[i]); | |
506 | } | |
507 | ||
1da177e4 LT |
508 | reservedpages = 0; |
509 | ||
510 | /* this will put all low memory onto the freelists */ | |
2b97690f | 511 | #ifdef CONFIG_NUMA |
0a43e4bf | 512 | totalram_pages = numa_free_all_bootmem(); |
1da177e4 | 513 | #else |
0a43e4bf | 514 | totalram_pages = free_all_bootmem(); |
1da177e4 | 515 | #endif |
5cb248ab MG |
516 | reservedpages = end_pfn - totalram_pages - |
517 | absent_pages_in_range(0, end_pfn); | |
1da177e4 LT |
518 | |
519 | after_bootmem = 1; | |
520 | ||
521 | codesize = (unsigned long) &_etext - (unsigned long) &_text; | |
522 | datasize = (unsigned long) &_edata - (unsigned long) &_etext; | |
523 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; | |
524 | ||
525 | /* Register memory areas for /proc/kcore */ | |
526 | kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT); | |
527 | kclist_add(&kcore_vmalloc, (void *)VMALLOC_START, | |
528 | VMALLOC_END-VMALLOC_START); | |
529 | kclist_add(&kcore_kernel, &_stext, _end - _stext); | |
530 | kclist_add(&kcore_modules, (void *)MODULES_VADDR, MODULES_LEN); | |
531 | kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START, | |
532 | VSYSCALL_END - VSYSCALL_START); | |
533 | ||
0a43e4bf | 534 | printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n", |
1da177e4 LT |
535 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), |
536 | end_pfn << (PAGE_SHIFT-10), | |
537 | codesize >> 10, | |
538 | reservedpages << (PAGE_SHIFT-10), | |
539 | datasize >> 10, | |
540 | initsize >> 10); | |
1da177e4 LT |
541 | } |
542 | ||
d167a518 | 543 | void free_init_pages(char *what, unsigned long begin, unsigned long end) |
1da177e4 LT |
544 | { |
545 | unsigned long addr; | |
546 | ||
d167a518 GH |
547 | if (begin >= end) |
548 | return; | |
549 | ||
6fb14755 | 550 | printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10); |
d167a518 | 551 | for (addr = begin; addr < end; addr += PAGE_SIZE) { |
e3ebadd9 LT |
552 | ClearPageReserved(virt_to_page(addr)); |
553 | init_page_count(virt_to_page(addr)); | |
554 | memset((void *)(addr & ~(PAGE_SIZE-1)), | |
555 | POISON_FREE_INITMEM, PAGE_SIZE); | |
6fb14755 JB |
556 | if (addr >= __START_KERNEL_map) |
557 | change_page_attr_addr(addr, 1, __pgprot(0)); | |
e3ebadd9 | 558 | free_page(addr); |
1da177e4 LT |
559 | totalram_pages++; |
560 | } | |
6fb14755 JB |
561 | if (addr > __START_KERNEL_map) |
562 | global_flush_tlb(); | |
d167a518 GH |
563 | } |
564 | ||
565 | void free_initmem(void) | |
566 | { | |
d167a518 | 567 | free_init_pages("unused kernel memory", |
e3ebadd9 LT |
568 | (unsigned long)(&__init_begin), |
569 | (unsigned long)(&__init_end)); | |
1da177e4 LT |
570 | } |
571 | ||
67df197b AV |
572 | #ifdef CONFIG_DEBUG_RODATA |
573 | ||
67df197b AV |
574 | void mark_rodata_ro(void) |
575 | { | |
e3ebadd9 | 576 | unsigned long start = (unsigned long)_stext, end; |
67df197b | 577 | |
602033ed LT |
578 | #ifdef CONFIG_HOTPLUG_CPU |
579 | /* It must still be possible to apply SMP alternatives. */ | |
580 | if (num_possible_cpus() > 1) | |
581 | start = (unsigned long)_etext; | |
582 | #endif | |
583 | ||
584 | #ifdef CONFIG_KPROBES | |
585 | start = (unsigned long)__start_rodata; | |
586 | #endif | |
587 | ||
e3ebadd9 LT |
588 | end = (unsigned long)__end_rodata; |
589 | start = (start + PAGE_SIZE - 1) & PAGE_MASK; | |
590 | end &= PAGE_MASK; | |
591 | if (end <= start) | |
592 | return; | |
593 | ||
594 | change_page_attr_addr(start, (end - start) >> PAGE_SHIFT, PAGE_KERNEL_RO); | |
67df197b | 595 | |
6fb14755 | 596 | printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n", |
e3ebadd9 | 597 | (end - start) >> 10); |
67df197b AV |
598 | |
599 | /* | |
600 | * change_page_attr_addr() requires a global_flush_tlb() call after it. | |
601 | * We do this after the printk so that if something went wrong in the | |
602 | * change, the printk gets out at least to give a better debug hint | |
603 | * of who is the culprit. | |
604 | */ | |
605 | global_flush_tlb(); | |
606 | } | |
607 | #endif | |
608 | ||
1da177e4 LT |
609 | #ifdef CONFIG_BLK_DEV_INITRD |
610 | void free_initrd_mem(unsigned long start, unsigned long end) | |
611 | { | |
e3ebadd9 | 612 | free_init_pages("initrd memory", start, end); |
1da177e4 LT |
613 | } |
614 | #endif | |
615 | ||
616 | void __init reserve_bootmem_generic(unsigned long phys, unsigned len) | |
617 | { | |
2b97690f | 618 | #ifdef CONFIG_NUMA |
1da177e4 | 619 | int nid = phys_to_nid(phys); |
5e58a02a AK |
620 | #endif |
621 | unsigned long pfn = phys >> PAGE_SHIFT; | |
622 | if (pfn >= end_pfn) { | |
623 | /* This can happen with kdump kernels when accessing firmware | |
624 | tables. */ | |
625 | if (pfn < end_pfn_map) | |
626 | return; | |
627 | printk(KERN_ERR "reserve_bootmem: illegal reserve %lx %u\n", | |
628 | phys, len); | |
629 | return; | |
630 | } | |
631 | ||
632 | /* Should check here against the e820 map to avoid double free */ | |
633 | #ifdef CONFIG_NUMA | |
1da177e4 LT |
634 | reserve_bootmem_node(NODE_DATA(nid), phys, len); |
635 | #else | |
636 | reserve_bootmem(phys, len); | |
637 | #endif | |
0e0b864e | 638 | if (phys+len <= MAX_DMA_PFN*PAGE_SIZE) { |
e18c6874 | 639 | dma_reserve += len / PAGE_SIZE; |
0e0b864e MG |
640 | set_dma_reserve(dma_reserve); |
641 | } | |
1da177e4 LT |
642 | } |
643 | ||
644 | int kern_addr_valid(unsigned long addr) | |
645 | { | |
646 | unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT; | |
647 | pgd_t *pgd; | |
648 | pud_t *pud; | |
649 | pmd_t *pmd; | |
650 | pte_t *pte; | |
651 | ||
652 | if (above != 0 && above != -1UL) | |
653 | return 0; | |
654 | ||
655 | pgd = pgd_offset_k(addr); | |
656 | if (pgd_none(*pgd)) | |
657 | return 0; | |
658 | ||
659 | pud = pud_offset(pgd, addr); | |
660 | if (pud_none(*pud)) | |
661 | return 0; | |
662 | ||
663 | pmd = pmd_offset(pud, addr); | |
664 | if (pmd_none(*pmd)) | |
665 | return 0; | |
666 | if (pmd_large(*pmd)) | |
667 | return pfn_valid(pmd_pfn(*pmd)); | |
668 | ||
669 | pte = pte_offset_kernel(pmd, addr); | |
670 | if (pte_none(*pte)) | |
671 | return 0; | |
672 | return pfn_valid(pte_pfn(*pte)); | |
673 | } | |
674 | ||
103efcd9 | 675 | /* A pseudo VMA to allow ptrace access for the vsyscall page. This only |
1e014410 AK |
676 | covers the 64bit vsyscall page now. 32bit has a real VMA now and does |
677 | not need special handling anymore. */ | |
1da177e4 LT |
678 | |
679 | static struct vm_area_struct gate_vma = { | |
680 | .vm_start = VSYSCALL_START, | |
103efcd9 EP |
681 | .vm_end = VSYSCALL_START + (VSYSCALL_MAPPED_PAGES << PAGE_SHIFT), |
682 | .vm_page_prot = PAGE_READONLY_EXEC, | |
683 | .vm_flags = VM_READ | VM_EXEC | |
1da177e4 LT |
684 | }; |
685 | ||
1da177e4 LT |
686 | struct vm_area_struct *get_gate_vma(struct task_struct *tsk) |
687 | { | |
688 | #ifdef CONFIG_IA32_EMULATION | |
1e014410 AK |
689 | if (test_tsk_thread_flag(tsk, TIF_IA32)) |
690 | return NULL; | |
1da177e4 LT |
691 | #endif |
692 | return &gate_vma; | |
693 | } | |
694 | ||
695 | int in_gate_area(struct task_struct *task, unsigned long addr) | |
696 | { | |
697 | struct vm_area_struct *vma = get_gate_vma(task); | |
1e014410 AK |
698 | if (!vma) |
699 | return 0; | |
1da177e4 LT |
700 | return (addr >= vma->vm_start) && (addr < vma->vm_end); |
701 | } | |
702 | ||
703 | /* Use this when you have no reliable task/vma, typically from interrupt | |
704 | * context. It is less reliable than using the task's vma and may give | |
705 | * false positives. | |
706 | */ | |
707 | int in_gate_area_no_task(unsigned long addr) | |
708 | { | |
1e014410 | 709 | return (addr >= VSYSCALL_START) && (addr < VSYSCALL_END); |
1da177e4 | 710 | } |
2e1c49db | 711 | |
2aae950b AK |
712 | const char *arch_vma_name(struct vm_area_struct *vma) |
713 | { | |
714 | if (vma->vm_mm && vma->vm_start == (long)vma->vm_mm->context.vdso) | |
715 | return "[vdso]"; | |
716 | if (vma == &gate_vma) | |
717 | return "[vsyscall]"; | |
718 | return NULL; | |
719 | } | |
0889eba5 CL |
720 | |
721 | #ifdef CONFIG_SPARSEMEM_VMEMMAP | |
722 | /* | |
723 | * Initialise the sparsemem vmemmap using huge-pages at the PMD level. | |
724 | */ | |
725 | int __meminit vmemmap_populate(struct page *start_page, | |
726 | unsigned long size, int node) | |
727 | { | |
728 | unsigned long addr = (unsigned long)start_page; | |
729 | unsigned long end = (unsigned long)(start_page + size); | |
730 | unsigned long next; | |
731 | pgd_t *pgd; | |
732 | pud_t *pud; | |
733 | pmd_t *pmd; | |
734 | ||
735 | for (; addr < end; addr = next) { | |
736 | next = pmd_addr_end(addr, end); | |
737 | ||
738 | pgd = vmemmap_pgd_populate(addr, node); | |
739 | if (!pgd) | |
740 | return -ENOMEM; | |
741 | pud = vmemmap_pud_populate(pgd, addr, node); | |
742 | if (!pud) | |
743 | return -ENOMEM; | |
744 | ||
745 | pmd = pmd_offset(pud, addr); | |
746 | if (pmd_none(*pmd)) { | |
747 | pte_t entry; | |
748 | void *p = vmemmap_alloc_block(PMD_SIZE, node); | |
749 | if (!p) | |
750 | return -ENOMEM; | |
751 | ||
27ec161f | 752 | entry = pfn_pte(__pa(p) >> PAGE_SHIFT, PAGE_KERNEL_LARGE); |
0889eba5 CL |
753 | set_pmd(pmd, __pmd(pte_val(entry))); |
754 | ||
755 | printk(KERN_DEBUG " [%lx-%lx] PMD ->%p on node %d\n", | |
756 | addr, addr + PMD_SIZE - 1, p, node); | |
757 | } else | |
758 | vmemmap_verify((pte_t *)pmd, node, addr, next); | |
759 | } | |
760 | ||
761 | return 0; | |
762 | } | |
763 | #endif |