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