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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> |
7bfeab9a | 48 | #include <asm/cacheflush.h> |
1da177e4 | 49 | |
14a62c34 | 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 | ||
00d1c5e0 IM |
57 | int direct_gbpages __meminitdata |
58 | #ifdef CONFIG_DIRECT_GBPAGES | |
59 | = 1 | |
60 | #endif | |
61 | ; | |
62 | ||
63 | static int __init parse_direct_gbpages_off(char *arg) | |
64 | { | |
65 | direct_gbpages = 0; | |
66 | return 0; | |
67 | } | |
68 | early_param("nogbpages", parse_direct_gbpages_off); | |
69 | ||
70 | static int __init parse_direct_gbpages_on(char *arg) | |
71 | { | |
72 | direct_gbpages = 1; | |
73 | return 0; | |
74 | } | |
75 | early_param("gbpages", parse_direct_gbpages_on); | |
76 | ||
1da177e4 LT |
77 | /* |
78 | * NOTE: pagetable_init alloc all the fixmap pagetables contiguous on the | |
79 | * physical space so we can cache the place of the first one and move | |
80 | * around without checking the pgd every time. | |
81 | */ | |
82 | ||
83 | void show_mem(void) | |
84 | { | |
e92343cc AK |
85 | long i, total = 0, reserved = 0; |
86 | long shared = 0, cached = 0; | |
1da177e4 | 87 | struct page *page; |
14a62c34 | 88 | pg_data_t *pgdat; |
1da177e4 | 89 | |
e92343cc | 90 | printk(KERN_INFO "Mem-info:\n"); |
1da177e4 | 91 | show_free_areas(); |
14a62c34 TG |
92 | printk(KERN_INFO "Free swap: %6ldkB\n", |
93 | nr_swap_pages << (PAGE_SHIFT-10)); | |
1da177e4 | 94 | |
ec936fc5 | 95 | for_each_online_pgdat(pgdat) { |
14a62c34 TG |
96 | for (i = 0; i < pgdat->node_spanned_pages; ++i) { |
97 | /* | |
98 | * This loop can take a while with 256 GB and | |
99 | * 4k pages so defer the NMI watchdog: | |
100 | */ | |
101 | if (unlikely(i % MAX_ORDER_NR_PAGES == 0)) | |
ae32b129 | 102 | touch_nmi_watchdog(); |
14a62c34 | 103 | |
12710a56 BP |
104 | if (!pfn_valid(pgdat->node_start_pfn + i)) |
105 | continue; | |
14a62c34 | 106 | |
1da177e4 LT |
107 | page = pfn_to_page(pgdat->node_start_pfn + i); |
108 | total++; | |
e92343cc AK |
109 | if (PageReserved(page)) |
110 | reserved++; | |
111 | else if (PageSwapCache(page)) | |
112 | cached++; | |
113 | else if (page_count(page)) | |
114 | shared += page_count(page) - 1; | |
14a62c34 | 115 | } |
1da177e4 | 116 | } |
14a62c34 TG |
117 | printk(KERN_INFO "%lu pages of RAM\n", total); |
118 | printk(KERN_INFO "%lu reserved pages\n", reserved); | |
119 | printk(KERN_INFO "%lu pages shared\n", shared); | |
120 | printk(KERN_INFO "%lu pages swap cached\n", cached); | |
1da177e4 LT |
121 | } |
122 | ||
1da177e4 LT |
123 | int after_bootmem; |
124 | ||
5f44a669 | 125 | static __init void *spp_getpage(void) |
14a62c34 | 126 | { |
1da177e4 | 127 | void *ptr; |
14a62c34 | 128 | |
1da177e4 | 129 | if (after_bootmem) |
14a62c34 | 130 | ptr = (void *) get_zeroed_page(GFP_ATOMIC); |
1da177e4 LT |
131 | else |
132 | ptr = alloc_bootmem_pages(PAGE_SIZE); | |
14a62c34 TG |
133 | |
134 | if (!ptr || ((unsigned long)ptr & ~PAGE_MASK)) { | |
135 | panic("set_pte_phys: cannot allocate page data %s\n", | |
136 | after_bootmem ? "after bootmem" : ""); | |
137 | } | |
1da177e4 | 138 | |
10f22dde | 139 | pr_debug("spp_getpage %p\n", ptr); |
14a62c34 | 140 | |
1da177e4 | 141 | return ptr; |
14a62c34 | 142 | } |
1da177e4 | 143 | |
14a62c34 TG |
144 | static __init void |
145 | set_pte_phys(unsigned long vaddr, unsigned long phys, pgprot_t prot) | |
1da177e4 LT |
146 | { |
147 | pgd_t *pgd; | |
148 | pud_t *pud; | |
149 | pmd_t *pmd; | |
150 | pte_t *pte, new_pte; | |
151 | ||
10f22dde | 152 | pr_debug("set_pte_phys %lx to %lx\n", vaddr, phys); |
1da177e4 LT |
153 | |
154 | pgd = pgd_offset_k(vaddr); | |
155 | if (pgd_none(*pgd)) { | |
10f22dde IM |
156 | printk(KERN_ERR |
157 | "PGD FIXMAP MISSING, it should be setup in head.S!\n"); | |
1da177e4 LT |
158 | return; |
159 | } | |
160 | pud = pud_offset(pgd, vaddr); | |
161 | if (pud_none(*pud)) { | |
14a62c34 | 162 | pmd = (pmd_t *) spp_getpage(); |
1da177e4 LT |
163 | set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE | _PAGE_USER)); |
164 | if (pmd != pmd_offset(pud, 0)) { | |
10f22dde | 165 | printk(KERN_ERR "PAGETABLE BUG #01! %p <-> %p\n", |
14a62c34 | 166 | pmd, pmd_offset(pud, 0)); |
1da177e4 LT |
167 | return; |
168 | } | |
169 | } | |
170 | pmd = pmd_offset(pud, vaddr); | |
171 | if (pmd_none(*pmd)) { | |
172 | pte = (pte_t *) spp_getpage(); | |
173 | set_pmd(pmd, __pmd(__pa(pte) | _KERNPG_TABLE | _PAGE_USER)); | |
174 | if (pte != pte_offset_kernel(pmd, 0)) { | |
10f22dde | 175 | printk(KERN_ERR "PAGETABLE BUG #02!\n"); |
1da177e4 LT |
176 | return; |
177 | } | |
178 | } | |
179 | new_pte = pfn_pte(phys >> PAGE_SHIFT, prot); | |
180 | ||
181 | pte = pte_offset_kernel(pmd, vaddr); | |
182 | if (!pte_none(*pte) && | |
183 | pte_val(*pte) != (pte_val(new_pte) & __supported_pte_mask)) | |
184 | pte_ERROR(*pte); | |
185 | set_pte(pte, new_pte); | |
186 | ||
187 | /* | |
188 | * It's enough to flush this one mapping. | |
189 | * (PGE mappings get flushed as well) | |
190 | */ | |
191 | __flush_tlb_one(vaddr); | |
192 | } | |
193 | ||
31eedd82 | 194 | /* |
88f3aec7 IM |
195 | * The head.S code sets up the kernel high mapping: |
196 | * | |
197 | * from __START_KERNEL_map to __START_KERNEL_map + size (== _end-_text) | |
31eedd82 TG |
198 | * |
199 | * phys_addr holds the negative offset to the kernel, which is added | |
200 | * to the compile time generated pmds. This results in invalid pmds up | |
201 | * to the point where we hit the physaddr 0 mapping. | |
202 | * | |
203 | * We limit the mappings to the region from _text to _end. _end is | |
204 | * rounded up to the 2MB boundary. This catches the invalid pmds as | |
205 | * well, as they are located before _text: | |
206 | */ | |
207 | void __init cleanup_highmap(void) | |
208 | { | |
209 | unsigned long vaddr = __START_KERNEL_map; | |
210 | unsigned long end = round_up((unsigned long)_end, PMD_SIZE) - 1; | |
211 | pmd_t *pmd = level2_kernel_pgt; | |
212 | pmd_t *last_pmd = pmd + PTRS_PER_PMD; | |
213 | ||
214 | for (; pmd < last_pmd; pmd++, vaddr += PMD_SIZE) { | |
215 | if (!pmd_present(*pmd)) | |
216 | continue; | |
217 | if (vaddr < (unsigned long) _text || vaddr > end) | |
218 | set_pmd(pmd, __pmd(0)); | |
219 | } | |
220 | } | |
221 | ||
1da177e4 | 222 | /* NOTE: this is meant to be run only at boot */ |
14a62c34 TG |
223 | void __init |
224 | __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot) | |
1da177e4 LT |
225 | { |
226 | unsigned long address = __fix_to_virt(idx); | |
227 | ||
228 | if (idx >= __end_of_fixed_addresses) { | |
10f22dde | 229 | printk(KERN_ERR "Invalid __set_fixmap\n"); |
1da177e4 LT |
230 | return; |
231 | } | |
232 | set_pte_phys(address, phys, prot); | |
233 | } | |
234 | ||
75175278 AK |
235 | static unsigned long __initdata table_start; |
236 | static unsigned long __meminitdata table_end; | |
1da177e4 | 237 | |
dafe41ee | 238 | static __meminit void *alloc_low_page(unsigned long *phys) |
14a62c34 | 239 | { |
dafe41ee | 240 | unsigned long pfn = table_end++; |
1da177e4 LT |
241 | void *adr; |
242 | ||
44df75e6 MT |
243 | if (after_bootmem) { |
244 | adr = (void *)get_zeroed_page(GFP_ATOMIC); | |
245 | *phys = __pa(adr); | |
14a62c34 | 246 | |
44df75e6 MT |
247 | return adr; |
248 | } | |
249 | ||
14a62c34 TG |
250 | if (pfn >= end_pfn) |
251 | panic("alloc_low_page: ran out of memory"); | |
dafe41ee VG |
252 | |
253 | adr = early_ioremap(pfn * PAGE_SIZE, PAGE_SIZE); | |
44df75e6 | 254 | memset(adr, 0, PAGE_SIZE); |
dafe41ee VG |
255 | *phys = pfn * PAGE_SIZE; |
256 | return adr; | |
257 | } | |
1da177e4 | 258 | |
dafe41ee | 259 | static __meminit void unmap_low_page(void *adr) |
14a62c34 | 260 | { |
44df75e6 MT |
261 | if (after_bootmem) |
262 | return; | |
263 | ||
dafe41ee | 264 | early_iounmap(adr, PAGE_SIZE); |
14a62c34 | 265 | } |
1da177e4 | 266 | |
f2d3efed | 267 | /* Must run before zap_low_mappings */ |
a3142c8e | 268 | __meminit void *early_ioremap(unsigned long addr, unsigned long size) |
f2d3efed | 269 | { |
dafe41ee | 270 | pmd_t *pmd, *last_pmd; |
14a62c34 | 271 | unsigned long vaddr; |
dafe41ee VG |
272 | int i, pmds; |
273 | ||
274 | pmds = ((addr & ~PMD_MASK) + size + ~PMD_MASK) / PMD_SIZE; | |
275 | vaddr = __START_KERNEL_map; | |
276 | pmd = level2_kernel_pgt; | |
277 | last_pmd = level2_kernel_pgt + PTRS_PER_PMD - 1; | |
14a62c34 | 278 | |
dafe41ee VG |
279 | for (; pmd <= last_pmd; pmd++, vaddr += PMD_SIZE) { |
280 | for (i = 0; i < pmds; i++) { | |
281 | if (pmd_present(pmd[i])) | |
14a62c34 | 282 | goto continue_outer_loop; |
dafe41ee VG |
283 | } |
284 | vaddr += addr & ~PMD_MASK; | |
285 | addr &= PMD_MASK; | |
14a62c34 | 286 | |
dafe41ee | 287 | for (i = 0; i < pmds; i++, addr += PMD_SIZE) |
929fd589 | 288 | set_pmd(pmd+i, __pmd(addr | __PAGE_KERNEL_LARGE_EXEC)); |
1a2b4412 | 289 | __flush_tlb_all(); |
14a62c34 | 290 | |
dafe41ee | 291 | return (void *)vaddr; |
14a62c34 | 292 | continue_outer_loop: |
dafe41ee | 293 | ; |
f2d3efed | 294 | } |
10f22dde | 295 | printk(KERN_ERR "early_ioremap(0x%lx, %lu) failed\n", addr, size); |
14a62c34 | 296 | |
dafe41ee | 297 | return NULL; |
f2d3efed AK |
298 | } |
299 | ||
14a62c34 TG |
300 | /* |
301 | * To avoid virtual aliases later: | |
302 | */ | |
a3142c8e | 303 | __meminit void early_iounmap(void *addr, unsigned long size) |
f2d3efed | 304 | { |
dafe41ee VG |
305 | unsigned long vaddr; |
306 | pmd_t *pmd; | |
307 | int i, pmds; | |
308 | ||
309 | vaddr = (unsigned long)addr; | |
310 | pmds = ((vaddr & ~PMD_MASK) + size + ~PMD_MASK) / PMD_SIZE; | |
311 | pmd = level2_kernel_pgt + pmd_index(vaddr); | |
14a62c34 | 312 | |
dafe41ee VG |
313 | for (i = 0; i < pmds; i++) |
314 | pmd_clear(pmd + i); | |
14a62c34 | 315 | |
1a2b4412 | 316 | __flush_tlb_all(); |
f2d3efed AK |
317 | } |
318 | ||
44df75e6 | 319 | static void __meminit |
6ad91658 | 320 | phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end) |
44df75e6 | 321 | { |
6ad91658 | 322 | int i = pmd_index(address); |
44df75e6 | 323 | |
6ad91658 | 324 | for (; i < PTRS_PER_PMD; i++, address += PMD_SIZE) { |
6ad91658 | 325 | pmd_t *pmd = pmd_page + pmd_index(address); |
44df75e6 | 326 | |
5f51e139 | 327 | if (address >= end) { |
14a62c34 | 328 | if (!after_bootmem) { |
5f51e139 JB |
329 | for (; i < PTRS_PER_PMD; i++, pmd++) |
330 | set_pmd(pmd, __pmd(0)); | |
14a62c34 | 331 | } |
44df75e6 MT |
332 | break; |
333 | } | |
6ad91658 KM |
334 | |
335 | if (pmd_val(*pmd)) | |
336 | continue; | |
337 | ||
d4f71f79 AK |
338 | set_pte((pte_t *)pmd, |
339 | pfn_pte(address >> PAGE_SHIFT, PAGE_KERNEL_LARGE)); | |
44df75e6 MT |
340 | } |
341 | } | |
342 | ||
343 | static void __meminit | |
344 | phys_pmd_update(pud_t *pud, unsigned long address, unsigned long end) | |
345 | { | |
14a62c34 | 346 | pmd_t *pmd = pmd_offset(pud, 0); |
6ad91658 KM |
347 | spin_lock(&init_mm.page_table_lock); |
348 | phys_pmd_init(pmd, address, end); | |
349 | spin_unlock(&init_mm.page_table_lock); | |
350 | __flush_tlb_all(); | |
44df75e6 MT |
351 | } |
352 | ||
14a62c34 TG |
353 | static void __meminit |
354 | phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end) | |
355 | { | |
6ad91658 | 356 | int i = pud_index(addr); |
44df75e6 | 357 | |
14a62c34 | 358 | for (; i < PTRS_PER_PUD; i++, addr = (addr & PUD_MASK) + PUD_SIZE) { |
6ad91658 KM |
359 | unsigned long pmd_phys; |
360 | pud_t *pud = pud_page + pud_index(addr); | |
1da177e4 LT |
361 | pmd_t *pmd; |
362 | ||
6ad91658 | 363 | if (addr >= end) |
1da177e4 | 364 | break; |
1da177e4 | 365 | |
14a62c34 TG |
366 | if (!after_bootmem && |
367 | !e820_any_mapped(addr, addr+PUD_SIZE, 0)) { | |
368 | set_pud(pud, __pud(0)); | |
1da177e4 | 369 | continue; |
14a62c34 | 370 | } |
1da177e4 | 371 | |
6ad91658 | 372 | if (pud_val(*pud)) { |
ef925766 AK |
373 | if (!pud_large(*pud)) |
374 | phys_pmd_update(pud, addr, end); | |
375 | continue; | |
376 | } | |
377 | ||
378 | if (direct_gbpages) { | |
379 | set_pte((pte_t *)pud, | |
380 | pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL_LARGE)); | |
6ad91658 KM |
381 | continue; |
382 | } | |
383 | ||
dafe41ee | 384 | pmd = alloc_low_page(&pmd_phys); |
14a62c34 | 385 | |
44df75e6 | 386 | spin_lock(&init_mm.page_table_lock); |
1da177e4 | 387 | set_pud(pud, __pud(pmd_phys | _KERNPG_TABLE)); |
6ad91658 | 388 | phys_pmd_init(pmd, addr, end); |
44df75e6 | 389 | spin_unlock(&init_mm.page_table_lock); |
14a62c34 | 390 | |
dafe41ee | 391 | unmap_low_page(pmd); |
1da177e4 | 392 | } |
1a2b4412 | 393 | __flush_tlb_all(); |
14a62c34 | 394 | } |
1da177e4 LT |
395 | |
396 | static void __init find_early_table_space(unsigned long end) | |
397 | { | |
6c5acd16 | 398 | unsigned long puds, pmds, tables, start; |
1da177e4 LT |
399 | |
400 | puds = (end + PUD_SIZE - 1) >> PUD_SHIFT; | |
ef925766 AK |
401 | tables = round_up(puds * sizeof(pud_t), PAGE_SIZE); |
402 | if (!direct_gbpages) { | |
403 | pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT; | |
404 | tables += round_up(pmds * sizeof(pmd_t), PAGE_SIZE); | |
405 | } | |
1da177e4 | 406 | |
14a62c34 TG |
407 | /* |
408 | * RED-PEN putting page tables only on node 0 could | |
409 | * cause a hotspot and fill up ZONE_DMA. The page tables | |
410 | * need roughly 0.5KB per GB. | |
411 | */ | |
412 | start = 0x8000; | |
24a5da73 | 413 | table_start = find_e820_area(start, end, tables, PAGE_SIZE); |
1da177e4 LT |
414 | if (table_start == -1UL) |
415 | panic("Cannot find space for the kernel page tables"); | |
416 | ||
417 | table_start >>= PAGE_SHIFT; | |
418 | table_end = table_start; | |
44df75e6 MT |
419 | |
420 | early_printk("kernel direct mapping tables up to %lx @ %lx-%lx\n", | |
5f51e139 JB |
421 | end, table_start << PAGE_SHIFT, |
422 | (table_start << PAGE_SHIFT) + tables); | |
1da177e4 LT |
423 | } |
424 | ||
ef925766 AK |
425 | static void __init init_gbpages(void) |
426 | { | |
427 | if (direct_gbpages && cpu_has_gbpages) | |
428 | printk(KERN_INFO "Using GB pages for direct mapping\n"); | |
429 | else | |
430 | direct_gbpages = 0; | |
431 | } | |
432 | ||
14a62c34 TG |
433 | /* |
434 | * Setup the direct mapping of the physical memory at PAGE_OFFSET. | |
435 | * This runs before bootmem is initialized and gets pages directly from | |
436 | * the physical memory. To access them they are temporarily mapped. | |
437 | */ | |
b6fd6ecb | 438 | void __init_refok init_memory_mapping(unsigned long start, unsigned long end) |
14a62c34 TG |
439 | { |
440 | unsigned long next; | |
1da177e4 | 441 | |
10f22dde | 442 | pr_debug("init_memory_mapping\n"); |
1da177e4 | 443 | |
14a62c34 | 444 | /* |
1da177e4 | 445 | * Find space for the kernel direct mapping tables. |
14a62c34 TG |
446 | * |
447 | * Later we should allocate these tables in the local node of the | |
448 | * memory mapped. Unfortunately this is done currently before the | |
449 | * nodes are discovered. | |
1da177e4 | 450 | */ |
ef925766 AK |
451 | if (!after_bootmem) { |
452 | init_gbpages(); | |
44df75e6 | 453 | find_early_table_space(end); |
ef925766 | 454 | } |
1da177e4 LT |
455 | |
456 | start = (unsigned long)__va(start); | |
457 | end = (unsigned long)__va(end); | |
458 | ||
459 | for (; start < end; start = next) { | |
44df75e6 | 460 | pgd_t *pgd = pgd_offset_k(start); |
14a62c34 | 461 | unsigned long pud_phys; |
44df75e6 MT |
462 | pud_t *pud; |
463 | ||
464 | if (after_bootmem) | |
d2ae5b5f | 465 | pud = pud_offset(pgd, start & PGDIR_MASK); |
44df75e6 | 466 | else |
dafe41ee | 467 | pud = alloc_low_page(&pud_phys); |
44df75e6 | 468 | |
1da177e4 | 469 | next = start + PGDIR_SIZE; |
14a62c34 TG |
470 | if (next > end) |
471 | next = end; | |
1da177e4 | 472 | phys_pud_init(pud, __pa(start), __pa(next)); |
44df75e6 MT |
473 | if (!after_bootmem) |
474 | set_pgd(pgd_offset_k(start), mk_kernel_pgd(pud_phys)); | |
dafe41ee | 475 | unmap_low_page(pud); |
14a62c34 | 476 | } |
1da177e4 | 477 | |
44df75e6 | 478 | if (!after_bootmem) |
f51c9452 | 479 | mmu_cr4_features = read_cr4(); |
1da177e4 | 480 | __flush_tlb_all(); |
75175278 | 481 | |
24a5da73 YL |
482 | if (!after_bootmem) |
483 | reserve_early(table_start << PAGE_SHIFT, | |
484 | table_end << PAGE_SHIFT, "PGTABLE"); | |
1da177e4 LT |
485 | } |
486 | ||
2b97690f | 487 | #ifndef CONFIG_NUMA |
1da177e4 LT |
488 | void __init paging_init(void) |
489 | { | |
6391af17 | 490 | unsigned long max_zone_pfns[MAX_NR_ZONES]; |
14a62c34 | 491 | |
6391af17 MG |
492 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); |
493 | max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN; | |
494 | max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN; | |
495 | max_zone_pfns[ZONE_NORMAL] = end_pfn; | |
496 | ||
44df75e6 MT |
497 | memory_present(0, 0, end_pfn); |
498 | sparse_init(); | |
5cb248ab | 499 | free_area_init_nodes(max_zone_pfns); |
1da177e4 LT |
500 | } |
501 | #endif | |
502 | ||
44df75e6 MT |
503 | /* |
504 | * Memory hotplug specific functions | |
44df75e6 | 505 | */ |
44df75e6 MT |
506 | void online_page(struct page *page) |
507 | { | |
508 | ClearPageReserved(page); | |
7835e98b | 509 | init_page_count(page); |
44df75e6 MT |
510 | __free_page(page); |
511 | totalram_pages++; | |
512 | num_physpages++; | |
513 | } | |
514 | ||
bc02af93 | 515 | #ifdef CONFIG_MEMORY_HOTPLUG |
9d99aaa3 AK |
516 | /* |
517 | * Memory is added always to NORMAL zone. This means you will never get | |
518 | * additional DMA/DMA32 memory. | |
519 | */ | |
bc02af93 | 520 | int arch_add_memory(int nid, u64 start, u64 size) |
44df75e6 | 521 | { |
bc02af93 | 522 | struct pglist_data *pgdat = NODE_DATA(nid); |
776ed98b | 523 | struct zone *zone = pgdat->node_zones + ZONE_NORMAL; |
44df75e6 MT |
524 | unsigned long start_pfn = start >> PAGE_SHIFT; |
525 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
526 | int ret; | |
527 | ||
14a62c34 | 528 | init_memory_mapping(start, start + size-1); |
45e0b78b | 529 | |
44df75e6 | 530 | ret = __add_pages(zone, start_pfn, nr_pages); |
10f22dde | 531 | WARN_ON(1); |
44df75e6 | 532 | |
44df75e6 | 533 | return ret; |
44df75e6 | 534 | } |
bc02af93 | 535 | EXPORT_SYMBOL_GPL(arch_add_memory); |
44df75e6 | 536 | |
8243229f | 537 | #if !defined(CONFIG_ACPI_NUMA) && defined(CONFIG_NUMA) |
4942e998 KM |
538 | int memory_add_physaddr_to_nid(u64 start) |
539 | { | |
540 | return 0; | |
541 | } | |
8c2676a5 | 542 | EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid); |
4942e998 KM |
543 | #endif |
544 | ||
45e0b78b KM |
545 | #endif /* CONFIG_MEMORY_HOTPLUG */ |
546 | ||
14a62c34 TG |
547 | static struct kcore_list kcore_mem, kcore_vmalloc, kcore_kernel, |
548 | kcore_modules, kcore_vsyscall; | |
1da177e4 LT |
549 | |
550 | void __init mem_init(void) | |
551 | { | |
0a43e4bf | 552 | long codesize, reservedpages, datasize, initsize; |
1da177e4 | 553 | |
0dc243ae | 554 | pci_iommu_alloc(); |
1da177e4 | 555 | |
48ddb154 | 556 | /* clear_bss() already clear the empty_zero_page */ |
1da177e4 LT |
557 | |
558 | reservedpages = 0; | |
559 | ||
560 | /* this will put all low memory onto the freelists */ | |
2b97690f | 561 | #ifdef CONFIG_NUMA |
0a43e4bf | 562 | totalram_pages = numa_free_all_bootmem(); |
1da177e4 | 563 | #else |
0a43e4bf | 564 | totalram_pages = free_all_bootmem(); |
1da177e4 | 565 | #endif |
5cb248ab MG |
566 | reservedpages = end_pfn - totalram_pages - |
567 | absent_pages_in_range(0, end_pfn); | |
1da177e4 LT |
568 | after_bootmem = 1; |
569 | ||
570 | codesize = (unsigned long) &_etext - (unsigned long) &_text; | |
571 | datasize = (unsigned long) &_edata - (unsigned long) &_etext; | |
572 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; | |
573 | ||
574 | /* Register memory areas for /proc/kcore */ | |
14a62c34 TG |
575 | kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT); |
576 | kclist_add(&kcore_vmalloc, (void *)VMALLOC_START, | |
1da177e4 LT |
577 | VMALLOC_END-VMALLOC_START); |
578 | kclist_add(&kcore_kernel, &_stext, _end - _stext); | |
579 | kclist_add(&kcore_modules, (void *)MODULES_VADDR, MODULES_LEN); | |
14a62c34 | 580 | kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START, |
1da177e4 LT |
581 | VSYSCALL_END - VSYSCALL_START); |
582 | ||
10f22dde | 583 | printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, " |
14a62c34 | 584 | "%ldk reserved, %ldk data, %ldk init)\n", |
1da177e4 LT |
585 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), |
586 | end_pfn << (PAGE_SHIFT-10), | |
587 | codesize >> 10, | |
588 | reservedpages << (PAGE_SHIFT-10), | |
589 | datasize >> 10, | |
590 | initsize >> 10); | |
76ebd054 TG |
591 | |
592 | cpa_init(); | |
1da177e4 LT |
593 | } |
594 | ||
d167a518 | 595 | void free_init_pages(char *what, unsigned long begin, unsigned long end) |
1da177e4 | 596 | { |
bfc734b2 | 597 | unsigned long addr = begin; |
1da177e4 | 598 | |
bfc734b2 | 599 | if (addr >= end) |
d167a518 GH |
600 | return; |
601 | ||
ee01f112 IM |
602 | /* |
603 | * If debugging page accesses then do not free this memory but | |
604 | * mark them not present - any buggy init-section access will | |
605 | * create a kernel page fault: | |
606 | */ | |
607 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
608 | printk(KERN_INFO "debug: unmapping init memory %08lx..%08lx\n", | |
609 | begin, PAGE_ALIGN(end)); | |
610 | set_memory_np(begin, (end - begin) >> PAGE_SHIFT); | |
611 | #else | |
6fb14755 | 612 | printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10); |
14a62c34 | 613 | |
bfc734b2 | 614 | for (; addr < end; addr += PAGE_SIZE) { |
e3ebadd9 LT |
615 | ClearPageReserved(virt_to_page(addr)); |
616 | init_page_count(virt_to_page(addr)); | |
617 | memset((void *)(addr & ~(PAGE_SIZE-1)), | |
618 | POISON_FREE_INITMEM, PAGE_SIZE); | |
e3ebadd9 | 619 | free_page(addr); |
1da177e4 LT |
620 | totalram_pages++; |
621 | } | |
ee01f112 | 622 | #endif |
d167a518 GH |
623 | } |
624 | ||
625 | void free_initmem(void) | |
626 | { | |
d167a518 | 627 | free_init_pages("unused kernel memory", |
e3ebadd9 LT |
628 | (unsigned long)(&__init_begin), |
629 | (unsigned long)(&__init_end)); | |
1da177e4 LT |
630 | } |
631 | ||
67df197b | 632 | #ifdef CONFIG_DEBUG_RODATA |
edeed305 AV |
633 | const int rodata_test_data = 0xC3; |
634 | EXPORT_SYMBOL_GPL(rodata_test_data); | |
67df197b | 635 | |
67df197b AV |
636 | void mark_rodata_ro(void) |
637 | { | |
e3ebadd9 | 638 | unsigned long start = (unsigned long)_stext, end; |
67df197b | 639 | |
602033ed LT |
640 | #ifdef CONFIG_HOTPLUG_CPU |
641 | /* It must still be possible to apply SMP alternatives. */ | |
642 | if (num_possible_cpus() > 1) | |
643 | start = (unsigned long)_etext; | |
644 | #endif | |
645 | ||
646 | #ifdef CONFIG_KPROBES | |
647 | start = (unsigned long)__start_rodata; | |
648 | #endif | |
14a62c34 | 649 | |
e3ebadd9 LT |
650 | end = (unsigned long)__end_rodata; |
651 | start = (start + PAGE_SIZE - 1) & PAGE_MASK; | |
652 | end &= PAGE_MASK; | |
653 | if (end <= start) | |
654 | return; | |
655 | ||
67df197b | 656 | |
6fb14755 | 657 | printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n", |
e3ebadd9 | 658 | (end - start) >> 10); |
984bb80d AV |
659 | set_memory_ro(start, (end - start) >> PAGE_SHIFT); |
660 | ||
661 | /* | |
662 | * The rodata section (but not the kernel text!) should also be | |
663 | * not-executable. | |
664 | */ | |
665 | start = ((unsigned long)__start_rodata + PAGE_SIZE - 1) & PAGE_MASK; | |
666 | set_memory_nx(start, (end - start) >> PAGE_SHIFT); | |
67df197b | 667 | |
1a487252 AV |
668 | rodata_test(); |
669 | ||
0c42f392 | 670 | #ifdef CONFIG_CPA_DEBUG |
10f22dde | 671 | printk(KERN_INFO "Testing CPA: undo %lx-%lx\n", start, end); |
6d238cc4 | 672 | set_memory_rw(start, (end-start) >> PAGE_SHIFT); |
0c42f392 | 673 | |
10f22dde | 674 | printk(KERN_INFO "Testing CPA: again\n"); |
6d238cc4 | 675 | set_memory_ro(start, (end-start) >> PAGE_SHIFT); |
0c42f392 | 676 | #endif |
67df197b AV |
677 | } |
678 | #endif | |
679 | ||
1da177e4 LT |
680 | #ifdef CONFIG_BLK_DEV_INITRD |
681 | void free_initrd_mem(unsigned long start, unsigned long end) | |
682 | { | |
e3ebadd9 | 683 | free_init_pages("initrd memory", start, end); |
1da177e4 LT |
684 | } |
685 | #endif | |
686 | ||
14a62c34 TG |
687 | void __init reserve_bootmem_generic(unsigned long phys, unsigned len) |
688 | { | |
2b97690f | 689 | #ifdef CONFIG_NUMA |
1da177e4 | 690 | int nid = phys_to_nid(phys); |
5e58a02a AK |
691 | #endif |
692 | unsigned long pfn = phys >> PAGE_SHIFT; | |
14a62c34 | 693 | |
5e58a02a | 694 | if (pfn >= end_pfn) { |
14a62c34 TG |
695 | /* |
696 | * This can happen with kdump kernels when accessing | |
697 | * firmware tables: | |
698 | */ | |
5e58a02a AK |
699 | if (pfn < end_pfn_map) |
700 | return; | |
14a62c34 | 701 | |
5e58a02a AK |
702 | printk(KERN_ERR "reserve_bootmem: illegal reserve %lx %u\n", |
703 | phys, len); | |
704 | return; | |
705 | } | |
706 | ||
707 | /* Should check here against the e820 map to avoid double free */ | |
708 | #ifdef CONFIG_NUMA | |
72a7fe39 | 709 | reserve_bootmem_node(NODE_DATA(nid), phys, len, BOOTMEM_DEFAULT); |
14a62c34 | 710 | #else |
72a7fe39 | 711 | reserve_bootmem(phys, len, BOOTMEM_DEFAULT); |
1da177e4 | 712 | #endif |
0e0b864e | 713 | if (phys+len <= MAX_DMA_PFN*PAGE_SIZE) { |
e18c6874 | 714 | dma_reserve += len / PAGE_SIZE; |
0e0b864e MG |
715 | set_dma_reserve(dma_reserve); |
716 | } | |
1da177e4 LT |
717 | } |
718 | ||
14a62c34 TG |
719 | int kern_addr_valid(unsigned long addr) |
720 | { | |
1da177e4 | 721 | unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT; |
14a62c34 TG |
722 | pgd_t *pgd; |
723 | pud_t *pud; | |
724 | pmd_t *pmd; | |
725 | pte_t *pte; | |
1da177e4 LT |
726 | |
727 | if (above != 0 && above != -1UL) | |
14a62c34 TG |
728 | return 0; |
729 | ||
1da177e4 LT |
730 | pgd = pgd_offset_k(addr); |
731 | if (pgd_none(*pgd)) | |
732 | return 0; | |
733 | ||
734 | pud = pud_offset(pgd, addr); | |
735 | if (pud_none(*pud)) | |
14a62c34 | 736 | return 0; |
1da177e4 LT |
737 | |
738 | pmd = pmd_offset(pud, addr); | |
739 | if (pmd_none(*pmd)) | |
740 | return 0; | |
14a62c34 | 741 | |
1da177e4 LT |
742 | if (pmd_large(*pmd)) |
743 | return pfn_valid(pmd_pfn(*pmd)); | |
744 | ||
745 | pte = pte_offset_kernel(pmd, addr); | |
746 | if (pte_none(*pte)) | |
747 | return 0; | |
14a62c34 | 748 | |
1da177e4 LT |
749 | return pfn_valid(pte_pfn(*pte)); |
750 | } | |
751 | ||
14a62c34 TG |
752 | /* |
753 | * A pseudo VMA to allow ptrace access for the vsyscall page. This only | |
754 | * covers the 64bit vsyscall page now. 32bit has a real VMA now and does | |
755 | * not need special handling anymore: | |
756 | */ | |
1da177e4 | 757 | static struct vm_area_struct gate_vma = { |
14a62c34 TG |
758 | .vm_start = VSYSCALL_START, |
759 | .vm_end = VSYSCALL_START + (VSYSCALL_MAPPED_PAGES * PAGE_SIZE), | |
760 | .vm_page_prot = PAGE_READONLY_EXEC, | |
761 | .vm_flags = VM_READ | VM_EXEC | |
1da177e4 LT |
762 | }; |
763 | ||
1da177e4 LT |
764 | struct vm_area_struct *get_gate_vma(struct task_struct *tsk) |
765 | { | |
766 | #ifdef CONFIG_IA32_EMULATION | |
1e014410 AK |
767 | if (test_tsk_thread_flag(tsk, TIF_IA32)) |
768 | return NULL; | |
1da177e4 LT |
769 | #endif |
770 | return &gate_vma; | |
771 | } | |
772 | ||
773 | int in_gate_area(struct task_struct *task, unsigned long addr) | |
774 | { | |
775 | struct vm_area_struct *vma = get_gate_vma(task); | |
14a62c34 | 776 | |
1e014410 AK |
777 | if (!vma) |
778 | return 0; | |
14a62c34 | 779 | |
1da177e4 LT |
780 | return (addr >= vma->vm_start) && (addr < vma->vm_end); |
781 | } | |
782 | ||
14a62c34 TG |
783 | /* |
784 | * Use this when you have no reliable task/vma, typically from interrupt | |
785 | * context. It is less reliable than using the task's vma and may give | |
786 | * false positives: | |
1da177e4 LT |
787 | */ |
788 | int in_gate_area_no_task(unsigned long addr) | |
789 | { | |
1e014410 | 790 | return (addr >= VSYSCALL_START) && (addr < VSYSCALL_END); |
1da177e4 | 791 | } |
2e1c49db | 792 | |
2aae950b AK |
793 | const char *arch_vma_name(struct vm_area_struct *vma) |
794 | { | |
795 | if (vma->vm_mm && vma->vm_start == (long)vma->vm_mm->context.vdso) | |
796 | return "[vdso]"; | |
797 | if (vma == &gate_vma) | |
798 | return "[vsyscall]"; | |
799 | return NULL; | |
800 | } | |
0889eba5 CL |
801 | |
802 | #ifdef CONFIG_SPARSEMEM_VMEMMAP | |
803 | /* | |
804 | * Initialise the sparsemem vmemmap using huge-pages at the PMD level. | |
805 | */ | |
14a62c34 TG |
806 | int __meminit |
807 | vmemmap_populate(struct page *start_page, unsigned long size, int node) | |
0889eba5 CL |
808 | { |
809 | unsigned long addr = (unsigned long)start_page; | |
810 | unsigned long end = (unsigned long)(start_page + size); | |
811 | unsigned long next; | |
812 | pgd_t *pgd; | |
813 | pud_t *pud; | |
814 | pmd_t *pmd; | |
815 | ||
816 | for (; addr < end; addr = next) { | |
817 | next = pmd_addr_end(addr, end); | |
818 | ||
819 | pgd = vmemmap_pgd_populate(addr, node); | |
820 | if (!pgd) | |
821 | return -ENOMEM; | |
14a62c34 | 822 | |
0889eba5 CL |
823 | pud = vmemmap_pud_populate(pgd, addr, node); |
824 | if (!pud) | |
825 | return -ENOMEM; | |
826 | ||
827 | pmd = pmd_offset(pud, addr); | |
828 | if (pmd_none(*pmd)) { | |
829 | pte_t entry; | |
14a62c34 TG |
830 | void *p; |
831 | ||
832 | p = vmemmap_alloc_block(PMD_SIZE, node); | |
0889eba5 CL |
833 | if (!p) |
834 | return -ENOMEM; | |
835 | ||
14a62c34 TG |
836 | entry = pfn_pte(__pa(p) >> PAGE_SHIFT, |
837 | PAGE_KERNEL_LARGE); | |
0889eba5 CL |
838 | set_pmd(pmd, __pmd(pte_val(entry))); |
839 | ||
840 | printk(KERN_DEBUG " [%lx-%lx] PMD ->%p on node %d\n", | |
841 | addr, addr + PMD_SIZE - 1, p, node); | |
14a62c34 | 842 | } else { |
0889eba5 | 843 | vmemmap_verify((pte_t *)pmd, node, addr, next); |
14a62c34 | 844 | } |
0889eba5 | 845 | } |
0889eba5 CL |
846 | return 0; |
847 | } | |
848 | #endif |