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 | |
a2531293 | 5 | * Copyright (C) 2000 Pavel Machek <pavel@ucw.cz> |
1da177e4 LT |
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> | |
11034d55 | 21 | #include <linux/initrd.h> |
1da177e4 LT |
22 | #include <linux/pagemap.h> |
23 | #include <linux/bootmem.h> | |
a9ce6bc1 | 24 | #include <linux/memblock.h> |
1da177e4 | 25 | #include <linux/proc_fs.h> |
59170891 | 26 | #include <linux/pci.h> |
6fb14755 | 27 | #include <linux/pfn.h> |
c9cf5528 | 28 | #include <linux/poison.h> |
17a941d8 | 29 | #include <linux/dma-mapping.h> |
44df75e6 MT |
30 | #include <linux/module.h> |
31 | #include <linux/memory_hotplug.h> | |
ae32b129 | 32 | #include <linux/nmi.h> |
5a0e3ad6 | 33 | #include <linux/gfp.h> |
1da177e4 LT |
34 | |
35 | #include <asm/processor.h> | |
46eaa670 | 36 | #include <asm/bios_ebda.h> |
1da177e4 LT |
37 | #include <asm/system.h> |
38 | #include <asm/uaccess.h> | |
39 | #include <asm/pgtable.h> | |
40 | #include <asm/pgalloc.h> | |
41 | #include <asm/dma.h> | |
42 | #include <asm/fixmap.h> | |
43 | #include <asm/e820.h> | |
44 | #include <asm/apic.h> | |
45 | #include <asm/tlb.h> | |
46 | #include <asm/mmu_context.h> | |
47 | #include <asm/proto.h> | |
48 | #include <asm/smp.h> | |
2bc0414e | 49 | #include <asm/sections.h> |
718fc13b | 50 | #include <asm/kdebug.h> |
aaa64e04 | 51 | #include <asm/numa.h> |
7bfeab9a | 52 | #include <asm/cacheflush.h> |
4fcb2083 | 53 | #include <asm/init.h> |
1dc41aa6 | 54 | #include <asm/uv/uv.h> |
e5f15b45 | 55 | #include <asm/setup.h> |
1da177e4 | 56 | |
00d1c5e0 IM |
57 | static int __init parse_direct_gbpages_off(char *arg) |
58 | { | |
59 | direct_gbpages = 0; | |
60 | return 0; | |
61 | } | |
62 | early_param("nogbpages", parse_direct_gbpages_off); | |
63 | ||
64 | static int __init parse_direct_gbpages_on(char *arg) | |
65 | { | |
66 | direct_gbpages = 1; | |
67 | return 0; | |
68 | } | |
69 | early_param("gbpages", parse_direct_gbpages_on); | |
70 | ||
1da177e4 LT |
71 | /* |
72 | * NOTE: pagetable_init alloc all the fixmap pagetables contiguous on the | |
73 | * physical space so we can cache the place of the first one and move | |
74 | * around without checking the pgd every time. | |
75 | */ | |
76 | ||
be43d728 | 77 | pteval_t __supported_pte_mask __read_mostly = ~_PAGE_IOMAP; |
bd220a24 YL |
78 | EXPORT_SYMBOL_GPL(__supported_pte_mask); |
79 | ||
bd220a24 YL |
80 | int force_personality32; |
81 | ||
deed05b7 IM |
82 | /* |
83 | * noexec32=on|off | |
84 | * Control non executable heap for 32bit processes. | |
85 | * To control the stack too use noexec=off | |
86 | * | |
87 | * on PROT_READ does not imply PROT_EXEC for 32-bit processes (default) | |
88 | * off PROT_READ implies PROT_EXEC | |
89 | */ | |
bd220a24 YL |
90 | static int __init nonx32_setup(char *str) |
91 | { | |
92 | if (!strcmp(str, "on")) | |
93 | force_personality32 &= ~READ_IMPLIES_EXEC; | |
94 | else if (!strcmp(str, "off")) | |
95 | force_personality32 |= READ_IMPLIES_EXEC; | |
96 | return 1; | |
97 | } | |
98 | __setup("noexec32=", nonx32_setup); | |
99 | ||
6afb5157 HL |
100 | /* |
101 | * When memory was added/removed make sure all the processes MM have | |
102 | * suitable PGD entries in the local PGD level page. | |
103 | */ | |
104 | void sync_global_pgds(unsigned long start, unsigned long end) | |
105 | { | |
44235dcd JF |
106 | unsigned long address; |
107 | ||
108 | for (address = start; address <= end; address += PGDIR_SIZE) { | |
109 | const pgd_t *pgd_ref = pgd_offset_k(address); | |
44235dcd JF |
110 | struct page *page; |
111 | ||
112 | if (pgd_none(*pgd_ref)) | |
113 | continue; | |
114 | ||
a79e53d8 | 115 | spin_lock(&pgd_lock); |
44235dcd JF |
116 | list_for_each_entry(page, &pgd_list, lru) { |
117 | pgd_t *pgd; | |
617d34d9 JF |
118 | spinlock_t *pgt_lock; |
119 | ||
44235dcd | 120 | pgd = (pgd_t *)page_address(page) + pgd_index(address); |
a79e53d8 | 121 | /* the pgt_lock only for Xen */ |
617d34d9 JF |
122 | pgt_lock = &pgd_page_get_mm(page)->page_table_lock; |
123 | spin_lock(pgt_lock); | |
124 | ||
44235dcd JF |
125 | if (pgd_none(*pgd)) |
126 | set_pgd(pgd, *pgd_ref); | |
127 | else | |
128 | BUG_ON(pgd_page_vaddr(*pgd) | |
129 | != pgd_page_vaddr(*pgd_ref)); | |
617d34d9 JF |
130 | |
131 | spin_unlock(pgt_lock); | |
44235dcd | 132 | } |
a79e53d8 | 133 | spin_unlock(&pgd_lock); |
44235dcd | 134 | } |
6afb5157 HL |
135 | } |
136 | ||
8d6ea967 MS |
137 | /* |
138 | * NOTE: This function is marked __ref because it calls __init function | |
139 | * (alloc_bootmem_pages). It's safe to do it ONLY when after_bootmem == 0. | |
140 | */ | |
141 | static __ref void *spp_getpage(void) | |
14a62c34 | 142 | { |
1da177e4 | 143 | void *ptr; |
14a62c34 | 144 | |
1da177e4 | 145 | if (after_bootmem) |
9e730237 | 146 | ptr = (void *) get_zeroed_page(GFP_ATOMIC | __GFP_NOTRACK); |
1da177e4 LT |
147 | else |
148 | ptr = alloc_bootmem_pages(PAGE_SIZE); | |
14a62c34 TG |
149 | |
150 | if (!ptr || ((unsigned long)ptr & ~PAGE_MASK)) { | |
151 | panic("set_pte_phys: cannot allocate page data %s\n", | |
152 | after_bootmem ? "after bootmem" : ""); | |
153 | } | |
1da177e4 | 154 | |
10f22dde | 155 | pr_debug("spp_getpage %p\n", ptr); |
14a62c34 | 156 | |
1da177e4 | 157 | return ptr; |
14a62c34 | 158 | } |
1da177e4 | 159 | |
f254f390 | 160 | static pud_t *fill_pud(pgd_t *pgd, unsigned long vaddr) |
1da177e4 | 161 | { |
458a3e64 TH |
162 | if (pgd_none(*pgd)) { |
163 | pud_t *pud = (pud_t *)spp_getpage(); | |
164 | pgd_populate(&init_mm, pgd, pud); | |
165 | if (pud != pud_offset(pgd, 0)) | |
166 | printk(KERN_ERR "PAGETABLE BUG #00! %p <-> %p\n", | |
167 | pud, pud_offset(pgd, 0)); | |
168 | } | |
169 | return pud_offset(pgd, vaddr); | |
170 | } | |
1da177e4 | 171 | |
f254f390 | 172 | static pmd_t *fill_pmd(pud_t *pud, unsigned long vaddr) |
458a3e64 | 173 | { |
1da177e4 | 174 | if (pud_none(*pud)) { |
458a3e64 | 175 | pmd_t *pmd = (pmd_t *) spp_getpage(); |
bb23e403 | 176 | pud_populate(&init_mm, pud, pmd); |
458a3e64 | 177 | if (pmd != pmd_offset(pud, 0)) |
10f22dde | 178 | printk(KERN_ERR "PAGETABLE BUG #01! %p <-> %p\n", |
458a3e64 | 179 | pmd, pmd_offset(pud, 0)); |
1da177e4 | 180 | } |
458a3e64 TH |
181 | return pmd_offset(pud, vaddr); |
182 | } | |
183 | ||
f254f390 | 184 | static pte_t *fill_pte(pmd_t *pmd, unsigned long vaddr) |
458a3e64 | 185 | { |
1da177e4 | 186 | if (pmd_none(*pmd)) { |
458a3e64 | 187 | pte_t *pte = (pte_t *) spp_getpage(); |
bb23e403 | 188 | pmd_populate_kernel(&init_mm, pmd, pte); |
458a3e64 | 189 | if (pte != pte_offset_kernel(pmd, 0)) |
10f22dde | 190 | printk(KERN_ERR "PAGETABLE BUG #02!\n"); |
1da177e4 | 191 | } |
458a3e64 TH |
192 | return pte_offset_kernel(pmd, vaddr); |
193 | } | |
194 | ||
195 | void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte) | |
196 | { | |
197 | pud_t *pud; | |
198 | pmd_t *pmd; | |
199 | pte_t *pte; | |
200 | ||
201 | pud = pud_page + pud_index(vaddr); | |
202 | pmd = fill_pmd(pud, vaddr); | |
203 | pte = fill_pte(pmd, vaddr); | |
1da177e4 | 204 | |
1da177e4 LT |
205 | set_pte(pte, new_pte); |
206 | ||
207 | /* | |
208 | * It's enough to flush this one mapping. | |
209 | * (PGE mappings get flushed as well) | |
210 | */ | |
211 | __flush_tlb_one(vaddr); | |
212 | } | |
213 | ||
458a3e64 | 214 | void set_pte_vaddr(unsigned long vaddr, pte_t pteval) |
0814e0ba EH |
215 | { |
216 | pgd_t *pgd; | |
217 | pud_t *pud_page; | |
218 | ||
219 | pr_debug("set_pte_vaddr %lx to %lx\n", vaddr, native_pte_val(pteval)); | |
220 | ||
221 | pgd = pgd_offset_k(vaddr); | |
222 | if (pgd_none(*pgd)) { | |
223 | printk(KERN_ERR | |
224 | "PGD FIXMAP MISSING, it should be setup in head.S!\n"); | |
225 | return; | |
226 | } | |
227 | pud_page = (pud_t*)pgd_page_vaddr(*pgd); | |
228 | set_pte_vaddr_pud(pud_page, vaddr, pteval); | |
229 | } | |
230 | ||
458a3e64 | 231 | pmd_t * __init populate_extra_pmd(unsigned long vaddr) |
11124411 TH |
232 | { |
233 | pgd_t *pgd; | |
234 | pud_t *pud; | |
235 | ||
236 | pgd = pgd_offset_k(vaddr); | |
458a3e64 TH |
237 | pud = fill_pud(pgd, vaddr); |
238 | return fill_pmd(pud, vaddr); | |
239 | } | |
240 | ||
241 | pte_t * __init populate_extra_pte(unsigned long vaddr) | |
242 | { | |
243 | pmd_t *pmd; | |
11124411 | 244 | |
458a3e64 TH |
245 | pmd = populate_extra_pmd(vaddr); |
246 | return fill_pte(pmd, vaddr); | |
11124411 TH |
247 | } |
248 | ||
3a9e189d JS |
249 | /* |
250 | * Create large page table mappings for a range of physical addresses. | |
251 | */ | |
252 | static void __init __init_extra_mapping(unsigned long phys, unsigned long size, | |
253 | pgprot_t prot) | |
254 | { | |
255 | pgd_t *pgd; | |
256 | pud_t *pud; | |
257 | pmd_t *pmd; | |
258 | ||
259 | BUG_ON((phys & ~PMD_MASK) || (size & ~PMD_MASK)); | |
260 | for (; size; phys += PMD_SIZE, size -= PMD_SIZE) { | |
261 | pgd = pgd_offset_k((unsigned long)__va(phys)); | |
262 | if (pgd_none(*pgd)) { | |
263 | pud = (pud_t *) spp_getpage(); | |
264 | set_pgd(pgd, __pgd(__pa(pud) | _KERNPG_TABLE | | |
265 | _PAGE_USER)); | |
266 | } | |
267 | pud = pud_offset(pgd, (unsigned long)__va(phys)); | |
268 | if (pud_none(*pud)) { | |
269 | pmd = (pmd_t *) spp_getpage(); | |
270 | set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE | | |
271 | _PAGE_USER)); | |
272 | } | |
273 | pmd = pmd_offset(pud, phys); | |
274 | BUG_ON(!pmd_none(*pmd)); | |
275 | set_pmd(pmd, __pmd(phys | pgprot_val(prot))); | |
276 | } | |
277 | } | |
278 | ||
279 | void __init init_extra_mapping_wb(unsigned long phys, unsigned long size) | |
280 | { | |
281 | __init_extra_mapping(phys, size, PAGE_KERNEL_LARGE); | |
282 | } | |
283 | ||
284 | void __init init_extra_mapping_uc(unsigned long phys, unsigned long size) | |
285 | { | |
286 | __init_extra_mapping(phys, size, PAGE_KERNEL_LARGE_NOCACHE); | |
287 | } | |
288 | ||
31eedd82 | 289 | /* |
88f3aec7 IM |
290 | * The head.S code sets up the kernel high mapping: |
291 | * | |
292 | * from __START_KERNEL_map to __START_KERNEL_map + size (== _end-_text) | |
31eedd82 TG |
293 | * |
294 | * phys_addr holds the negative offset to the kernel, which is added | |
295 | * to the compile time generated pmds. This results in invalid pmds up | |
296 | * to the point where we hit the physaddr 0 mapping. | |
297 | * | |
e5f15b45 YL |
298 | * We limit the mappings to the region from _text to _brk_end. _brk_end |
299 | * is rounded up to the 2MB boundary. This catches the invalid pmds as | |
31eedd82 TG |
300 | * well, as they are located before _text: |
301 | */ | |
302 | void __init cleanup_highmap(void) | |
303 | { | |
304 | unsigned long vaddr = __START_KERNEL_map; | |
e5f15b45 YL |
305 | unsigned long vaddr_end = __START_KERNEL_map + (max_pfn_mapped << PAGE_SHIFT); |
306 | unsigned long end = roundup((unsigned long)_brk_end, PMD_SIZE) - 1; | |
31eedd82 | 307 | pmd_t *pmd = level2_kernel_pgt; |
31eedd82 | 308 | |
e5f15b45 | 309 | for (; vaddr + PMD_SIZE - 1 < vaddr_end; pmd++, vaddr += PMD_SIZE) { |
2884f110 | 310 | if (pmd_none(*pmd)) |
31eedd82 TG |
311 | continue; |
312 | if (vaddr < (unsigned long) _text || vaddr > end) | |
313 | set_pmd(pmd, __pmd(0)); | |
314 | } | |
315 | } | |
316 | ||
9482ac6e | 317 | static __ref void *alloc_low_page(unsigned long *phys) |
14a62c34 | 318 | { |
d1b19426 | 319 | unsigned long pfn = pgt_buf_end++; |
1da177e4 LT |
320 | void *adr; |
321 | ||
44df75e6 | 322 | if (after_bootmem) { |
9e730237 | 323 | adr = (void *)get_zeroed_page(GFP_ATOMIC | __GFP_NOTRACK); |
44df75e6 | 324 | *phys = __pa(adr); |
14a62c34 | 325 | |
44df75e6 MT |
326 | return adr; |
327 | } | |
328 | ||
d1b19426 | 329 | if (pfn >= pgt_buf_top) |
14a62c34 | 330 | panic("alloc_low_page: ran out of memory"); |
dafe41ee | 331 | |
14941779 | 332 | adr = early_memremap(pfn * PAGE_SIZE, PAGE_SIZE); |
234bb549 | 333 | clear_page(adr); |
dafe41ee VG |
334 | *phys = pfn * PAGE_SIZE; |
335 | return adr; | |
336 | } | |
1da177e4 | 337 | |
4b239f45 YL |
338 | static __ref void *map_low_page(void *virt) |
339 | { | |
340 | void *adr; | |
341 | unsigned long phys, left; | |
342 | ||
343 | if (after_bootmem) | |
344 | return virt; | |
345 | ||
346 | phys = __pa(virt); | |
347 | left = phys & (PAGE_SIZE - 1); | |
348 | adr = early_memremap(phys & PAGE_MASK, PAGE_SIZE); | |
349 | adr = (void *)(((unsigned long)adr) | left); | |
350 | ||
351 | return adr; | |
352 | } | |
353 | ||
9482ac6e | 354 | static __ref void unmap_low_page(void *adr) |
14a62c34 | 355 | { |
44df75e6 MT |
356 | if (after_bootmem) |
357 | return; | |
358 | ||
4b239f45 | 359 | early_iounmap((void *)((unsigned long)adr & PAGE_MASK), PAGE_SIZE); |
14a62c34 | 360 | } |
1da177e4 | 361 | |
7b16eb89 | 362 | static unsigned long __meminit |
b27a43c1 SS |
363 | phys_pte_init(pte_t *pte_page, unsigned long addr, unsigned long end, |
364 | pgprot_t prot) | |
4f9c11dd JF |
365 | { |
366 | unsigned pages = 0; | |
7b16eb89 | 367 | unsigned long last_map_addr = end; |
4f9c11dd | 368 | int i; |
7b16eb89 | 369 | |
4f9c11dd JF |
370 | pte_t *pte = pte_page + pte_index(addr); |
371 | ||
372 | for(i = pte_index(addr); i < PTRS_PER_PTE; i++, addr += PAGE_SIZE, pte++) { | |
373 | ||
374 | if (addr >= end) { | |
375 | if (!after_bootmem) { | |
376 | for(; i < PTRS_PER_PTE; i++, pte++) | |
377 | set_pte(pte, __pte(0)); | |
378 | } | |
379 | break; | |
380 | } | |
381 | ||
b27a43c1 SS |
382 | /* |
383 | * We will re-use the existing mapping. | |
384 | * Xen for example has some special requirements, like mapping | |
385 | * pagetable pages as RO. So assume someone who pre-setup | |
386 | * these mappings are more intelligent. | |
387 | */ | |
3afa3949 YL |
388 | if (pte_val(*pte)) { |
389 | pages++; | |
4f9c11dd | 390 | continue; |
3afa3949 | 391 | } |
4f9c11dd JF |
392 | |
393 | if (0) | |
394 | printk(" pte=%p addr=%lx pte=%016lx\n", | |
395 | pte, addr, pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL).pte); | |
4f9c11dd | 396 | pages++; |
b27a43c1 | 397 | set_pte(pte, pfn_pte(addr >> PAGE_SHIFT, prot)); |
7b16eb89 | 398 | last_map_addr = (addr & PAGE_MASK) + PAGE_SIZE; |
4f9c11dd | 399 | } |
a2699e47 | 400 | |
4f9c11dd | 401 | update_page_count(PG_LEVEL_4K, pages); |
7b16eb89 YL |
402 | |
403 | return last_map_addr; | |
4f9c11dd JF |
404 | } |
405 | ||
cc615032 | 406 | static unsigned long __meminit |
b50efd2a | 407 | phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end, |
b27a43c1 | 408 | unsigned long page_size_mask, pgprot_t prot) |
44df75e6 | 409 | { |
ce0c0e50 | 410 | unsigned long pages = 0; |
7b16eb89 | 411 | unsigned long last_map_addr = end; |
ce0c0e50 | 412 | |
6ad91658 | 413 | int i = pmd_index(address); |
44df75e6 | 414 | |
6ad91658 | 415 | for (; i < PTRS_PER_PMD; i++, address += PMD_SIZE) { |
4f9c11dd | 416 | unsigned long pte_phys; |
6ad91658 | 417 | pmd_t *pmd = pmd_page + pmd_index(address); |
4f9c11dd | 418 | pte_t *pte; |
b27a43c1 | 419 | pgprot_t new_prot = prot; |
44df75e6 | 420 | |
5f51e139 | 421 | if (address >= end) { |
14a62c34 | 422 | if (!after_bootmem) { |
5f51e139 JB |
423 | for (; i < PTRS_PER_PMD; i++, pmd++) |
424 | set_pmd(pmd, __pmd(0)); | |
14a62c34 | 425 | } |
44df75e6 MT |
426 | break; |
427 | } | |
6ad91658 | 428 | |
4f9c11dd | 429 | if (pmd_val(*pmd)) { |
8ae3a5a8 JB |
430 | if (!pmd_large(*pmd)) { |
431 | spin_lock(&init_mm.page_table_lock); | |
4b239f45 YL |
432 | pte = map_low_page((pte_t *)pmd_page_vaddr(*pmd)); |
433 | last_map_addr = phys_pte_init(pte, address, | |
b27a43c1 | 434 | end, prot); |
4b239f45 | 435 | unmap_low_page(pte); |
8ae3a5a8 | 436 | spin_unlock(&init_mm.page_table_lock); |
a2699e47 | 437 | continue; |
8ae3a5a8 | 438 | } |
b27a43c1 SS |
439 | /* |
440 | * If we are ok with PG_LEVEL_2M mapping, then we will | |
441 | * use the existing mapping, | |
442 | * | |
443 | * Otherwise, we will split the large page mapping but | |
444 | * use the same existing protection bits except for | |
445 | * large page, so that we don't violate Intel's TLB | |
446 | * Application note (317080) which says, while changing | |
447 | * the page sizes, new and old translations should | |
448 | * not differ with respect to page frame and | |
449 | * attributes. | |
450 | */ | |
3afa3949 YL |
451 | if (page_size_mask & (1 << PG_LEVEL_2M)) { |
452 | pages++; | |
b27a43c1 | 453 | continue; |
3afa3949 | 454 | } |
b27a43c1 | 455 | new_prot = pte_pgprot(pte_clrhuge(*(pte_t *)pmd)); |
4f9c11dd JF |
456 | } |
457 | ||
b50efd2a | 458 | if (page_size_mask & (1<<PG_LEVEL_2M)) { |
4f9c11dd | 459 | pages++; |
8ae3a5a8 | 460 | spin_lock(&init_mm.page_table_lock); |
4f9c11dd | 461 | set_pte((pte_t *)pmd, |
b27a43c1 SS |
462 | pfn_pte(address >> PAGE_SHIFT, |
463 | __pgprot(pgprot_val(prot) | _PAGE_PSE))); | |
8ae3a5a8 | 464 | spin_unlock(&init_mm.page_table_lock); |
7b16eb89 | 465 | last_map_addr = (address & PMD_MASK) + PMD_SIZE; |
6ad91658 | 466 | continue; |
4f9c11dd | 467 | } |
6ad91658 | 468 | |
4f9c11dd | 469 | pte = alloc_low_page(&pte_phys); |
b27a43c1 | 470 | last_map_addr = phys_pte_init(pte, address, end, new_prot); |
4f9c11dd JF |
471 | unmap_low_page(pte); |
472 | ||
8ae3a5a8 | 473 | spin_lock(&init_mm.page_table_lock); |
4f9c11dd | 474 | pmd_populate_kernel(&init_mm, pmd, __va(pte_phys)); |
8ae3a5a8 | 475 | spin_unlock(&init_mm.page_table_lock); |
44df75e6 | 476 | } |
ce0c0e50 | 477 | update_page_count(PG_LEVEL_2M, pages); |
7b16eb89 | 478 | return last_map_addr; |
44df75e6 MT |
479 | } |
480 | ||
cc615032 | 481 | static unsigned long __meminit |
b50efd2a YL |
482 | phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end, |
483 | unsigned long page_size_mask) | |
14a62c34 | 484 | { |
ce0c0e50 | 485 | unsigned long pages = 0; |
cc615032 | 486 | unsigned long last_map_addr = end; |
6ad91658 | 487 | int i = pud_index(addr); |
44df75e6 | 488 | |
14a62c34 | 489 | for (; i < PTRS_PER_PUD; i++, addr = (addr & PUD_MASK) + PUD_SIZE) { |
6ad91658 KM |
490 | unsigned long pmd_phys; |
491 | pud_t *pud = pud_page + pud_index(addr); | |
1da177e4 | 492 | pmd_t *pmd; |
b27a43c1 | 493 | pgprot_t prot = PAGE_KERNEL; |
1da177e4 | 494 | |
6ad91658 | 495 | if (addr >= end) |
1da177e4 | 496 | break; |
1da177e4 | 497 | |
14a62c34 TG |
498 | if (!after_bootmem && |
499 | !e820_any_mapped(addr, addr+PUD_SIZE, 0)) { | |
500 | set_pud(pud, __pud(0)); | |
1da177e4 | 501 | continue; |
14a62c34 | 502 | } |
1da177e4 | 503 | |
6ad91658 | 504 | if (pud_val(*pud)) { |
a2699e47 | 505 | if (!pud_large(*pud)) { |
4b239f45 YL |
506 | pmd = map_low_page(pmd_offset(pud, 0)); |
507 | last_map_addr = phys_pmd_init(pmd, addr, end, | |
b27a43c1 | 508 | page_size_mask, prot); |
4b239f45 YL |
509 | unmap_low_page(pmd); |
510 | __flush_tlb_all(); | |
a2699e47 SS |
511 | continue; |
512 | } | |
b27a43c1 SS |
513 | /* |
514 | * If we are ok with PG_LEVEL_1G mapping, then we will | |
515 | * use the existing mapping. | |
516 | * | |
517 | * Otherwise, we will split the gbpage mapping but use | |
518 | * the same existing protection bits except for large | |
519 | * page, so that we don't violate Intel's TLB | |
520 | * Application note (317080) which says, while changing | |
521 | * the page sizes, new and old translations should | |
522 | * not differ with respect to page frame and | |
523 | * attributes. | |
524 | */ | |
3afa3949 YL |
525 | if (page_size_mask & (1 << PG_LEVEL_1G)) { |
526 | pages++; | |
b27a43c1 | 527 | continue; |
3afa3949 | 528 | } |
b27a43c1 | 529 | prot = pte_pgprot(pte_clrhuge(*(pte_t *)pud)); |
ef925766 AK |
530 | } |
531 | ||
b50efd2a | 532 | if (page_size_mask & (1<<PG_LEVEL_1G)) { |
ce0c0e50 | 533 | pages++; |
8ae3a5a8 | 534 | spin_lock(&init_mm.page_table_lock); |
ef925766 AK |
535 | set_pte((pte_t *)pud, |
536 | pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL_LARGE)); | |
8ae3a5a8 | 537 | spin_unlock(&init_mm.page_table_lock); |
cc615032 | 538 | last_map_addr = (addr & PUD_MASK) + PUD_SIZE; |
6ad91658 KM |
539 | continue; |
540 | } | |
541 | ||
dafe41ee | 542 | pmd = alloc_low_page(&pmd_phys); |
b27a43c1 SS |
543 | last_map_addr = phys_pmd_init(pmd, addr, end, page_size_mask, |
544 | prot); | |
4f9c11dd | 545 | unmap_low_page(pmd); |
8ae3a5a8 JB |
546 | |
547 | spin_lock(&init_mm.page_table_lock); | |
4f9c11dd | 548 | pud_populate(&init_mm, pud, __va(pmd_phys)); |
44df75e6 | 549 | spin_unlock(&init_mm.page_table_lock); |
1da177e4 | 550 | } |
1a2b4412 | 551 | __flush_tlb_all(); |
a2699e47 | 552 | |
ce0c0e50 | 553 | update_page_count(PG_LEVEL_1G, pages); |
cc615032 | 554 | |
1a0db38e | 555 | return last_map_addr; |
14a62c34 | 556 | } |
1da177e4 | 557 | |
41d840e2 | 558 | unsigned long __meminit |
f765090a PE |
559 | kernel_physical_mapping_init(unsigned long start, |
560 | unsigned long end, | |
561 | unsigned long page_size_mask) | |
14a62c34 | 562 | { |
9b861528 | 563 | bool pgd_changed = false; |
b50efd2a | 564 | unsigned long next, last_map_addr = end; |
9b861528 | 565 | unsigned long addr; |
1da177e4 LT |
566 | |
567 | start = (unsigned long)__va(start); | |
568 | end = (unsigned long)__va(end); | |
1c5f50ee | 569 | addr = start; |
1da177e4 LT |
570 | |
571 | for (; start < end; start = next) { | |
44df75e6 | 572 | pgd_t *pgd = pgd_offset_k(start); |
14a62c34 | 573 | unsigned long pud_phys; |
44df75e6 MT |
574 | pud_t *pud; |
575 | ||
e22146e6 | 576 | next = (start + PGDIR_SIZE) & PGDIR_MASK; |
4f9c11dd JF |
577 | if (next > end) |
578 | next = end; | |
579 | ||
580 | if (pgd_val(*pgd)) { | |
4b239f45 YL |
581 | pud = map_low_page((pud_t *)pgd_page_vaddr(*pgd)); |
582 | last_map_addr = phys_pud_init(pud, __pa(start), | |
b50efd2a | 583 | __pa(end), page_size_mask); |
4b239f45 | 584 | unmap_low_page(pud); |
4f9c11dd JF |
585 | continue; |
586 | } | |
587 | ||
8ae3a5a8 | 588 | pud = alloc_low_page(&pud_phys); |
b50efd2a YL |
589 | last_map_addr = phys_pud_init(pud, __pa(start), __pa(next), |
590 | page_size_mask); | |
4f9c11dd | 591 | unmap_low_page(pud); |
8ae3a5a8 JB |
592 | |
593 | spin_lock(&init_mm.page_table_lock); | |
594 | pgd_populate(&init_mm, pgd, __va(pud_phys)); | |
595 | spin_unlock(&init_mm.page_table_lock); | |
9b861528 | 596 | pgd_changed = true; |
14a62c34 | 597 | } |
9b861528 HL |
598 | |
599 | if (pgd_changed) | |
600 | sync_global_pgds(addr, end); | |
601 | ||
a2699e47 | 602 | __flush_tlb_all(); |
1da177e4 | 603 | |
b50efd2a YL |
604 | return last_map_addr; |
605 | } | |
7b16eb89 | 606 | |
2b97690f | 607 | #ifndef CONFIG_NUMA |
d8fc3afc | 608 | void __init initmem_init(void) |
1f75d7e3 | 609 | { |
86ef4dbf | 610 | memblock_x86_register_active_regions(0, 0, max_pfn); |
1f75d7e3 | 611 | } |
3551f88f | 612 | #endif |
1f75d7e3 | 613 | |
1da177e4 LT |
614 | void __init paging_init(void) |
615 | { | |
6391af17 | 616 | unsigned long max_zone_pfns[MAX_NR_ZONES]; |
14a62c34 | 617 | |
6391af17 | 618 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); |
dc382fd5 | 619 | #ifdef CONFIG_ZONE_DMA |
6391af17 | 620 | max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN; |
dc382fd5 | 621 | #endif |
6391af17 | 622 | max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN; |
c987d12f | 623 | max_zone_pfns[ZONE_NORMAL] = max_pfn; |
6391af17 | 624 | |
3551f88f | 625 | sparse_memory_present_with_active_regions(MAX_NUMNODES); |
44df75e6 | 626 | sparse_init(); |
44b57280 YL |
627 | |
628 | /* | |
629 | * clear the default setting with node 0 | |
630 | * note: don't use nodes_clear here, that is really clearing when | |
631 | * numa support is not compiled in, and later node_set_state | |
632 | * will not set it back. | |
633 | */ | |
634 | node_clear_state(0, N_NORMAL_MEMORY); | |
635 | ||
5cb248ab | 636 | free_area_init_nodes(max_zone_pfns); |
1da177e4 | 637 | } |
1da177e4 | 638 | |
44df75e6 MT |
639 | /* |
640 | * Memory hotplug specific functions | |
44df75e6 | 641 | */ |
bc02af93 | 642 | #ifdef CONFIG_MEMORY_HOTPLUG |
ea085417 SZ |
643 | /* |
644 | * After memory hotplug the variables max_pfn, max_low_pfn and high_memory need | |
645 | * updating. | |
646 | */ | |
647 | static void update_end_of_memory_vars(u64 start, u64 size) | |
648 | { | |
649 | unsigned long end_pfn = PFN_UP(start + size); | |
650 | ||
651 | if (end_pfn > max_pfn) { | |
652 | max_pfn = end_pfn; | |
653 | max_low_pfn = end_pfn; | |
654 | high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1; | |
655 | } | |
656 | } | |
657 | ||
9d99aaa3 AK |
658 | /* |
659 | * Memory is added always to NORMAL zone. This means you will never get | |
660 | * additional DMA/DMA32 memory. | |
661 | */ | |
bc02af93 | 662 | int arch_add_memory(int nid, u64 start, u64 size) |
44df75e6 | 663 | { |
bc02af93 | 664 | struct pglist_data *pgdat = NODE_DATA(nid); |
776ed98b | 665 | struct zone *zone = pgdat->node_zones + ZONE_NORMAL; |
cc615032 | 666 | unsigned long last_mapped_pfn, start_pfn = start >> PAGE_SHIFT; |
44df75e6 MT |
667 | unsigned long nr_pages = size >> PAGE_SHIFT; |
668 | int ret; | |
669 | ||
60817c9b | 670 | last_mapped_pfn = init_memory_mapping(start, start + size); |
cc615032 AK |
671 | if (last_mapped_pfn > max_pfn_mapped) |
672 | max_pfn_mapped = last_mapped_pfn; | |
45e0b78b | 673 | |
c04fc586 | 674 | ret = __add_pages(nid, zone, start_pfn, nr_pages); |
fe8b868e | 675 | WARN_ON_ONCE(ret); |
44df75e6 | 676 | |
ea085417 SZ |
677 | /* update max_pfn, max_low_pfn and high_memory */ |
678 | update_end_of_memory_vars(start, size); | |
679 | ||
44df75e6 | 680 | return ret; |
44df75e6 | 681 | } |
bc02af93 | 682 | EXPORT_SYMBOL_GPL(arch_add_memory); |
44df75e6 | 683 | |
45e0b78b KM |
684 | #endif /* CONFIG_MEMORY_HOTPLUG */ |
685 | ||
81ac3ad9 | 686 | static struct kcore_list kcore_vsyscall; |
1da177e4 LT |
687 | |
688 | void __init mem_init(void) | |
689 | { | |
0a43e4bf | 690 | long codesize, reservedpages, datasize, initsize; |
11a6b0c9 | 691 | unsigned long absent_pages; |
1da177e4 | 692 | |
0dc243ae | 693 | pci_iommu_alloc(); |
1da177e4 | 694 | |
48ddb154 | 695 | /* clear_bss() already clear the empty_zero_page */ |
1da177e4 LT |
696 | |
697 | reservedpages = 0; | |
698 | ||
699 | /* this will put all low memory onto the freelists */ | |
2b97690f | 700 | #ifdef CONFIG_NUMA |
0a43e4bf | 701 | totalram_pages = numa_free_all_bootmem(); |
1da177e4 | 702 | #else |
0a43e4bf | 703 | totalram_pages = free_all_bootmem(); |
1da177e4 | 704 | #endif |
11a6b0c9 YL |
705 | |
706 | absent_pages = absent_pages_in_range(0, max_pfn); | |
707 | reservedpages = max_pfn - totalram_pages - absent_pages; | |
1da177e4 LT |
708 | after_bootmem = 1; |
709 | ||
710 | codesize = (unsigned long) &_etext - (unsigned long) &_text; | |
711 | datasize = (unsigned long) &_edata - (unsigned long) &_etext; | |
712 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; | |
713 | ||
714 | /* Register memory areas for /proc/kcore */ | |
14a62c34 | 715 | kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START, |
c30bb2a2 | 716 | VSYSCALL_END - VSYSCALL_START, KCORE_OTHER); |
1da177e4 | 717 | |
10f22dde | 718 | printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, " |
11a6b0c9 | 719 | "%ldk absent, %ldk reserved, %ldk data, %ldk init)\n", |
cc013a88 | 720 | nr_free_pages() << (PAGE_SHIFT-10), |
c987d12f | 721 | max_pfn << (PAGE_SHIFT-10), |
1da177e4 | 722 | codesize >> 10, |
11a6b0c9 | 723 | absent_pages << (PAGE_SHIFT-10), |
1da177e4 LT |
724 | reservedpages << (PAGE_SHIFT-10), |
725 | datasize >> 10, | |
726 | initsize >> 10); | |
1da177e4 LT |
727 | } |
728 | ||
67df197b | 729 | #ifdef CONFIG_DEBUG_RODATA |
edeed305 AV |
730 | const int rodata_test_data = 0xC3; |
731 | EXPORT_SYMBOL_GPL(rodata_test_data); | |
67df197b | 732 | |
502f6604 | 733 | int kernel_set_to_readonly; |
16239630 SR |
734 | |
735 | void set_kernel_text_rw(void) | |
736 | { | |
b9af7c0d | 737 | unsigned long start = PFN_ALIGN(_text); |
e7d23dde | 738 | unsigned long end = PFN_ALIGN(__stop___ex_table); |
16239630 SR |
739 | |
740 | if (!kernel_set_to_readonly) | |
741 | return; | |
742 | ||
743 | pr_debug("Set kernel text: %lx - %lx for read write\n", | |
744 | start, end); | |
745 | ||
e7d23dde SS |
746 | /* |
747 | * Make the kernel identity mapping for text RW. Kernel text | |
748 | * mapping will always be RO. Refer to the comment in | |
749 | * static_protections() in pageattr.c | |
750 | */ | |
16239630 SR |
751 | set_memory_rw(start, (end - start) >> PAGE_SHIFT); |
752 | } | |
753 | ||
754 | void set_kernel_text_ro(void) | |
755 | { | |
b9af7c0d | 756 | unsigned long start = PFN_ALIGN(_text); |
e7d23dde | 757 | unsigned long end = PFN_ALIGN(__stop___ex_table); |
16239630 SR |
758 | |
759 | if (!kernel_set_to_readonly) | |
760 | return; | |
761 | ||
762 | pr_debug("Set kernel text: %lx - %lx for read only\n", | |
763 | start, end); | |
764 | ||
e7d23dde SS |
765 | /* |
766 | * Set the kernel identity mapping for text RO. | |
767 | */ | |
16239630 SR |
768 | set_memory_ro(start, (end - start) >> PAGE_SHIFT); |
769 | } | |
770 | ||
67df197b AV |
771 | void mark_rodata_ro(void) |
772 | { | |
74e08179 | 773 | unsigned long start = PFN_ALIGN(_text); |
8f0f996e SR |
774 | unsigned long rodata_start = |
775 | ((unsigned long)__start_rodata + PAGE_SIZE - 1) & PAGE_MASK; | |
74e08179 SS |
776 | unsigned long end = (unsigned long) &__end_rodata_hpage_align; |
777 | unsigned long text_end = PAGE_ALIGN((unsigned long) &__stop___ex_table); | |
778 | unsigned long rodata_end = PAGE_ALIGN((unsigned long) &__end_rodata); | |
779 | unsigned long data_start = (unsigned long) &_sdata; | |
8f0f996e | 780 | |
6fb14755 | 781 | printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n", |
e3ebadd9 | 782 | (end - start) >> 10); |
984bb80d AV |
783 | set_memory_ro(start, (end - start) >> PAGE_SHIFT); |
784 | ||
16239630 SR |
785 | kernel_set_to_readonly = 1; |
786 | ||
984bb80d AV |
787 | /* |
788 | * The rodata section (but not the kernel text!) should also be | |
789 | * not-executable. | |
790 | */ | |
72b59d67 | 791 | set_memory_nx(rodata_start, (end - rodata_start) >> PAGE_SHIFT); |
67df197b | 792 | |
1a487252 AV |
793 | rodata_test(); |
794 | ||
0c42f392 | 795 | #ifdef CONFIG_CPA_DEBUG |
10f22dde | 796 | printk(KERN_INFO "Testing CPA: undo %lx-%lx\n", start, end); |
6d238cc4 | 797 | set_memory_rw(start, (end-start) >> PAGE_SHIFT); |
0c42f392 | 798 | |
10f22dde | 799 | printk(KERN_INFO "Testing CPA: again\n"); |
6d238cc4 | 800 | set_memory_ro(start, (end-start) >> PAGE_SHIFT); |
0c42f392 | 801 | #endif |
74e08179 SS |
802 | |
803 | free_init_pages("unused kernel memory", | |
804 | (unsigned long) page_address(virt_to_page(text_end)), | |
805 | (unsigned long) | |
806 | page_address(virt_to_page(rodata_start))); | |
807 | free_init_pages("unused kernel memory", | |
808 | (unsigned long) page_address(virt_to_page(rodata_end)), | |
809 | (unsigned long) page_address(virt_to_page(data_start))); | |
67df197b | 810 | } |
4e4eee0e | 811 | |
67df197b AV |
812 | #endif |
813 | ||
14a62c34 TG |
814 | int kern_addr_valid(unsigned long addr) |
815 | { | |
1da177e4 | 816 | unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT; |
14a62c34 TG |
817 | pgd_t *pgd; |
818 | pud_t *pud; | |
819 | pmd_t *pmd; | |
820 | pte_t *pte; | |
1da177e4 LT |
821 | |
822 | if (above != 0 && above != -1UL) | |
14a62c34 TG |
823 | return 0; |
824 | ||
1da177e4 LT |
825 | pgd = pgd_offset_k(addr); |
826 | if (pgd_none(*pgd)) | |
827 | return 0; | |
828 | ||
829 | pud = pud_offset(pgd, addr); | |
830 | if (pud_none(*pud)) | |
14a62c34 | 831 | return 0; |
1da177e4 LT |
832 | |
833 | pmd = pmd_offset(pud, addr); | |
834 | if (pmd_none(*pmd)) | |
835 | return 0; | |
14a62c34 | 836 | |
1da177e4 LT |
837 | if (pmd_large(*pmd)) |
838 | return pfn_valid(pmd_pfn(*pmd)); | |
839 | ||
840 | pte = pte_offset_kernel(pmd, addr); | |
841 | if (pte_none(*pte)) | |
842 | return 0; | |
14a62c34 | 843 | |
1da177e4 LT |
844 | return pfn_valid(pte_pfn(*pte)); |
845 | } | |
846 | ||
14a62c34 TG |
847 | /* |
848 | * A pseudo VMA to allow ptrace access for the vsyscall page. This only | |
849 | * covers the 64bit vsyscall page now. 32bit has a real VMA now and does | |
850 | * not need special handling anymore: | |
851 | */ | |
1da177e4 | 852 | static struct vm_area_struct gate_vma = { |
14a62c34 TG |
853 | .vm_start = VSYSCALL_START, |
854 | .vm_end = VSYSCALL_START + (VSYSCALL_MAPPED_PAGES * PAGE_SIZE), | |
855 | .vm_page_prot = PAGE_READONLY_EXEC, | |
856 | .vm_flags = VM_READ | VM_EXEC | |
1da177e4 LT |
857 | }; |
858 | ||
31db58b3 | 859 | struct vm_area_struct *get_gate_vma(struct mm_struct *mm) |
1da177e4 LT |
860 | { |
861 | #ifdef CONFIG_IA32_EMULATION | |
31db58b3 | 862 | if (!mm || mm->context.ia32_compat) |
1e014410 | 863 | return NULL; |
1da177e4 LT |
864 | #endif |
865 | return &gate_vma; | |
866 | } | |
867 | ||
83b964bb | 868 | int in_gate_area(struct mm_struct *mm, unsigned long addr) |
1da177e4 | 869 | { |
83b964bb | 870 | struct vm_area_struct *vma = get_gate_vma(mm); |
14a62c34 | 871 | |
1e014410 AK |
872 | if (!vma) |
873 | return 0; | |
14a62c34 | 874 | |
1da177e4 LT |
875 | return (addr >= vma->vm_start) && (addr < vma->vm_end); |
876 | } | |
877 | ||
14a62c34 | 878 | /* |
cae5d390 SW |
879 | * Use this when you have no reliable mm, typically from interrupt |
880 | * context. It is less reliable than using a task's mm and may give | |
881 | * false positives. | |
1da177e4 | 882 | */ |
cae5d390 | 883 | int in_gate_area_no_mm(unsigned long addr) |
1da177e4 | 884 | { |
1e014410 | 885 | return (addr >= VSYSCALL_START) && (addr < VSYSCALL_END); |
1da177e4 | 886 | } |
2e1c49db | 887 | |
2aae950b AK |
888 | const char *arch_vma_name(struct vm_area_struct *vma) |
889 | { | |
890 | if (vma->vm_mm && vma->vm_start == (long)vma->vm_mm->context.vdso) | |
891 | return "[vdso]"; | |
892 | if (vma == &gate_vma) | |
893 | return "[vsyscall]"; | |
894 | return NULL; | |
895 | } | |
0889eba5 | 896 | |
1dc41aa6 NF |
897 | #ifdef CONFIG_X86_UV |
898 | #define MIN_MEMORY_BLOCK_SIZE (1 << SECTION_SIZE_BITS) | |
899 | ||
900 | unsigned long memory_block_size_bytes(void) | |
901 | { | |
902 | if (is_uv_system()) { | |
903 | printk(KERN_INFO "UV: memory block size 2GB\n"); | |
904 | return 2UL * 1024 * 1024 * 1024; | |
905 | } | |
906 | return MIN_MEMORY_BLOCK_SIZE; | |
907 | } | |
908 | #endif | |
909 | ||
0889eba5 CL |
910 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
911 | /* | |
912 | * Initialise the sparsemem vmemmap using huge-pages at the PMD level. | |
913 | */ | |
c2b91e2e YL |
914 | static long __meminitdata addr_start, addr_end; |
915 | static void __meminitdata *p_start, *p_end; | |
916 | static int __meminitdata node_start; | |
917 | ||
14a62c34 TG |
918 | int __meminit |
919 | vmemmap_populate(struct page *start_page, unsigned long size, int node) | |
0889eba5 CL |
920 | { |
921 | unsigned long addr = (unsigned long)start_page; | |
922 | unsigned long end = (unsigned long)(start_page + size); | |
923 | unsigned long next; | |
924 | pgd_t *pgd; | |
925 | pud_t *pud; | |
926 | pmd_t *pmd; | |
927 | ||
928 | for (; addr < end; addr = next) { | |
7c934d39 | 929 | void *p = NULL; |
0889eba5 CL |
930 | |
931 | pgd = vmemmap_pgd_populate(addr, node); | |
932 | if (!pgd) | |
933 | return -ENOMEM; | |
14a62c34 | 934 | |
0889eba5 CL |
935 | pud = vmemmap_pud_populate(pgd, addr, node); |
936 | if (!pud) | |
937 | return -ENOMEM; | |
938 | ||
7c934d39 JF |
939 | if (!cpu_has_pse) { |
940 | next = (addr + PAGE_SIZE) & PAGE_MASK; | |
941 | pmd = vmemmap_pmd_populate(pud, addr, node); | |
942 | ||
943 | if (!pmd) | |
944 | return -ENOMEM; | |
945 | ||
946 | p = vmemmap_pte_populate(pmd, addr, node); | |
14a62c34 | 947 | |
0889eba5 CL |
948 | if (!p) |
949 | return -ENOMEM; | |
950 | ||
7c934d39 JF |
951 | addr_end = addr + PAGE_SIZE; |
952 | p_end = p + PAGE_SIZE; | |
14a62c34 | 953 | } else { |
7c934d39 JF |
954 | next = pmd_addr_end(addr, end); |
955 | ||
956 | pmd = pmd_offset(pud, addr); | |
957 | if (pmd_none(*pmd)) { | |
958 | pte_t entry; | |
959 | ||
9bdac914 | 960 | p = vmemmap_alloc_block_buf(PMD_SIZE, node); |
7c934d39 JF |
961 | if (!p) |
962 | return -ENOMEM; | |
963 | ||
964 | entry = pfn_pte(__pa(p) >> PAGE_SHIFT, | |
965 | PAGE_KERNEL_LARGE); | |
966 | set_pmd(pmd, __pmd(pte_val(entry))); | |
967 | ||
7c934d39 JF |
968 | /* check to see if we have contiguous blocks */ |
969 | if (p_end != p || node_start != node) { | |
970 | if (p_start) | |
971 | printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n", | |
972 | addr_start, addr_end-1, p_start, p_end-1, node_start); | |
973 | addr_start = addr; | |
974 | node_start = node; | |
975 | p_start = p; | |
976 | } | |
49c980df YL |
977 | |
978 | addr_end = addr + PMD_SIZE; | |
979 | p_end = p + PMD_SIZE; | |
7c934d39 JF |
980 | } else |
981 | vmemmap_verify((pte_t *)pmd, node, addr, next); | |
14a62c34 | 982 | } |
7c934d39 | 983 | |
0889eba5 | 984 | } |
9b861528 | 985 | sync_global_pgds((unsigned long)start_page, end); |
0889eba5 CL |
986 | return 0; |
987 | } | |
c2b91e2e YL |
988 | |
989 | void __meminit vmemmap_populate_print_last(void) | |
990 | { | |
991 | if (p_start) { | |
992 | printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n", | |
993 | addr_start, addr_end-1, p_start, p_end-1, node_start); | |
994 | p_start = NULL; | |
995 | p_end = NULL; | |
996 | node_start = 0; | |
997 | } | |
998 | } | |
0889eba5 | 999 | #endif |