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 | 30 | #include <linux/module.h> |
a63fdc51 | 31 | #include <linux/memory.h> |
44df75e6 | 32 | #include <linux/memory_hotplug.h> |
ae32b129 | 33 | #include <linux/nmi.h> |
5a0e3ad6 | 34 | #include <linux/gfp.h> |
2f96b8c1 | 35 | #include <linux/kcore.h> |
1da177e4 LT |
36 | |
37 | #include <asm/processor.h> | |
46eaa670 | 38 | #include <asm/bios_ebda.h> |
1da177e4 LT |
39 | #include <asm/uaccess.h> |
40 | #include <asm/pgtable.h> | |
41 | #include <asm/pgalloc.h> | |
42 | #include <asm/dma.h> | |
43 | #include <asm/fixmap.h> | |
44 | #include <asm/e820.h> | |
45 | #include <asm/apic.h> | |
46 | #include <asm/tlb.h> | |
47 | #include <asm/mmu_context.h> | |
48 | #include <asm/proto.h> | |
49 | #include <asm/smp.h> | |
2bc0414e | 50 | #include <asm/sections.h> |
718fc13b | 51 | #include <asm/kdebug.h> |
aaa64e04 | 52 | #include <asm/numa.h> |
7bfeab9a | 53 | #include <asm/cacheflush.h> |
4fcb2083 | 54 | #include <asm/init.h> |
1dc41aa6 | 55 | #include <asm/uv/uv.h> |
e5f15b45 | 56 | #include <asm/setup.h> |
1da177e4 | 57 | |
5c51bdbe YL |
58 | #include "mm_internal.h" |
59 | ||
aece2785 YL |
60 | static void ident_pmd_init(unsigned long pmd_flag, pmd_t *pmd_page, |
61 | unsigned long addr, unsigned long end) | |
62 | { | |
63 | addr &= PMD_MASK; | |
64 | for (; addr < end; addr += PMD_SIZE) { | |
65 | pmd_t *pmd = pmd_page + pmd_index(addr); | |
66 | ||
67 | if (!pmd_present(*pmd)) | |
68 | set_pmd(pmd, __pmd(addr | pmd_flag)); | |
69 | } | |
70 | } | |
71 | static int ident_pud_init(struct x86_mapping_info *info, pud_t *pud_page, | |
72 | unsigned long addr, unsigned long end) | |
73 | { | |
74 | unsigned long next; | |
75 | ||
76 | for (; addr < end; addr = next) { | |
77 | pud_t *pud = pud_page + pud_index(addr); | |
78 | pmd_t *pmd; | |
79 | ||
80 | next = (addr & PUD_MASK) + PUD_SIZE; | |
81 | if (next > end) | |
82 | next = end; | |
83 | ||
84 | if (pud_present(*pud)) { | |
85 | pmd = pmd_offset(pud, 0); | |
86 | ident_pmd_init(info->pmd_flag, pmd, addr, next); | |
87 | continue; | |
88 | } | |
89 | pmd = (pmd_t *)info->alloc_pgt_page(info->context); | |
90 | if (!pmd) | |
91 | return -ENOMEM; | |
92 | ident_pmd_init(info->pmd_flag, pmd, addr, next); | |
93 | set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE)); | |
94 | } | |
95 | ||
96 | return 0; | |
97 | } | |
98 | ||
99 | int kernel_ident_mapping_init(struct x86_mapping_info *info, pgd_t *pgd_page, | |
100 | unsigned long addr, unsigned long end) | |
101 | { | |
102 | unsigned long next; | |
103 | int result; | |
104 | int off = info->kernel_mapping ? pgd_index(__PAGE_OFFSET) : 0; | |
105 | ||
106 | for (; addr < end; addr = next) { | |
107 | pgd_t *pgd = pgd_page + pgd_index(addr) + off; | |
108 | pud_t *pud; | |
109 | ||
110 | next = (addr & PGDIR_MASK) + PGDIR_SIZE; | |
111 | if (next > end) | |
112 | next = end; | |
113 | ||
114 | if (pgd_present(*pgd)) { | |
115 | pud = pud_offset(pgd, 0); | |
116 | result = ident_pud_init(info, pud, addr, next); | |
117 | if (result) | |
118 | return result; | |
119 | continue; | |
120 | } | |
121 | ||
122 | pud = (pud_t *)info->alloc_pgt_page(info->context); | |
123 | if (!pud) | |
124 | return -ENOMEM; | |
125 | result = ident_pud_init(info, pud, addr, next); | |
126 | if (result) | |
127 | return result; | |
128 | set_pgd(pgd, __pgd(__pa(pud) | _KERNPG_TABLE)); | |
129 | } | |
130 | ||
131 | return 0; | |
132 | } | |
133 | ||
00d1c5e0 IM |
134 | static int __init parse_direct_gbpages_off(char *arg) |
135 | { | |
136 | direct_gbpages = 0; | |
137 | return 0; | |
138 | } | |
139 | early_param("nogbpages", parse_direct_gbpages_off); | |
140 | ||
141 | static int __init parse_direct_gbpages_on(char *arg) | |
142 | { | |
143 | direct_gbpages = 1; | |
144 | return 0; | |
145 | } | |
146 | early_param("gbpages", parse_direct_gbpages_on); | |
147 | ||
1da177e4 LT |
148 | /* |
149 | * NOTE: pagetable_init alloc all the fixmap pagetables contiguous on the | |
150 | * physical space so we can cache the place of the first one and move | |
151 | * around without checking the pgd every time. | |
152 | */ | |
153 | ||
be43d728 | 154 | pteval_t __supported_pte_mask __read_mostly = ~_PAGE_IOMAP; |
bd220a24 YL |
155 | EXPORT_SYMBOL_GPL(__supported_pte_mask); |
156 | ||
bd220a24 YL |
157 | int force_personality32; |
158 | ||
deed05b7 IM |
159 | /* |
160 | * noexec32=on|off | |
161 | * Control non executable heap for 32bit processes. | |
162 | * To control the stack too use noexec=off | |
163 | * | |
164 | * on PROT_READ does not imply PROT_EXEC for 32-bit processes (default) | |
165 | * off PROT_READ implies PROT_EXEC | |
166 | */ | |
bd220a24 YL |
167 | static int __init nonx32_setup(char *str) |
168 | { | |
169 | if (!strcmp(str, "on")) | |
170 | force_personality32 &= ~READ_IMPLIES_EXEC; | |
171 | else if (!strcmp(str, "off")) | |
172 | force_personality32 |= READ_IMPLIES_EXEC; | |
173 | return 1; | |
174 | } | |
175 | __setup("noexec32=", nonx32_setup); | |
176 | ||
6afb5157 HL |
177 | /* |
178 | * When memory was added/removed make sure all the processes MM have | |
179 | * suitable PGD entries in the local PGD level page. | |
180 | */ | |
181 | void sync_global_pgds(unsigned long start, unsigned long end) | |
182 | { | |
44235dcd JF |
183 | unsigned long address; |
184 | ||
185 | for (address = start; address <= end; address += PGDIR_SIZE) { | |
186 | const pgd_t *pgd_ref = pgd_offset_k(address); | |
44235dcd JF |
187 | struct page *page; |
188 | ||
189 | if (pgd_none(*pgd_ref)) | |
190 | continue; | |
191 | ||
a79e53d8 | 192 | spin_lock(&pgd_lock); |
44235dcd | 193 | list_for_each_entry(page, &pgd_list, lru) { |
be354f40 | 194 | pgd_t *pgd; |
617d34d9 JF |
195 | spinlock_t *pgt_lock; |
196 | ||
44235dcd | 197 | pgd = (pgd_t *)page_address(page) + pgd_index(address); |
a79e53d8 | 198 | /* the pgt_lock only for Xen */ |
617d34d9 JF |
199 | pgt_lock = &pgd_page_get_mm(page)->page_table_lock; |
200 | spin_lock(pgt_lock); | |
201 | ||
44235dcd JF |
202 | if (pgd_none(*pgd)) |
203 | set_pgd(pgd, *pgd_ref); | |
204 | else | |
205 | BUG_ON(pgd_page_vaddr(*pgd) | |
206 | != pgd_page_vaddr(*pgd_ref)); | |
617d34d9 JF |
207 | |
208 | spin_unlock(pgt_lock); | |
44235dcd | 209 | } |
a79e53d8 | 210 | spin_unlock(&pgd_lock); |
44235dcd | 211 | } |
6afb5157 HL |
212 | } |
213 | ||
8d6ea967 MS |
214 | /* |
215 | * NOTE: This function is marked __ref because it calls __init function | |
216 | * (alloc_bootmem_pages). It's safe to do it ONLY when after_bootmem == 0. | |
217 | */ | |
218 | static __ref void *spp_getpage(void) | |
14a62c34 | 219 | { |
1da177e4 | 220 | void *ptr; |
14a62c34 | 221 | |
1da177e4 | 222 | if (after_bootmem) |
9e730237 | 223 | ptr = (void *) get_zeroed_page(GFP_ATOMIC | __GFP_NOTRACK); |
1da177e4 LT |
224 | else |
225 | ptr = alloc_bootmem_pages(PAGE_SIZE); | |
14a62c34 TG |
226 | |
227 | if (!ptr || ((unsigned long)ptr & ~PAGE_MASK)) { | |
228 | panic("set_pte_phys: cannot allocate page data %s\n", | |
229 | after_bootmem ? "after bootmem" : ""); | |
230 | } | |
1da177e4 | 231 | |
10f22dde | 232 | pr_debug("spp_getpage %p\n", ptr); |
14a62c34 | 233 | |
1da177e4 | 234 | return ptr; |
14a62c34 | 235 | } |
1da177e4 | 236 | |
f254f390 | 237 | static pud_t *fill_pud(pgd_t *pgd, unsigned long vaddr) |
1da177e4 | 238 | { |
458a3e64 TH |
239 | if (pgd_none(*pgd)) { |
240 | pud_t *pud = (pud_t *)spp_getpage(); | |
241 | pgd_populate(&init_mm, pgd, pud); | |
242 | if (pud != pud_offset(pgd, 0)) | |
243 | printk(KERN_ERR "PAGETABLE BUG #00! %p <-> %p\n", | |
244 | pud, pud_offset(pgd, 0)); | |
245 | } | |
246 | return pud_offset(pgd, vaddr); | |
247 | } | |
1da177e4 | 248 | |
f254f390 | 249 | static pmd_t *fill_pmd(pud_t *pud, unsigned long vaddr) |
458a3e64 | 250 | { |
1da177e4 | 251 | if (pud_none(*pud)) { |
458a3e64 | 252 | pmd_t *pmd = (pmd_t *) spp_getpage(); |
bb23e403 | 253 | pud_populate(&init_mm, pud, pmd); |
458a3e64 | 254 | if (pmd != pmd_offset(pud, 0)) |
10f22dde | 255 | printk(KERN_ERR "PAGETABLE BUG #01! %p <-> %p\n", |
458a3e64 | 256 | pmd, pmd_offset(pud, 0)); |
1da177e4 | 257 | } |
458a3e64 TH |
258 | return pmd_offset(pud, vaddr); |
259 | } | |
260 | ||
f254f390 | 261 | static pte_t *fill_pte(pmd_t *pmd, unsigned long vaddr) |
458a3e64 | 262 | { |
1da177e4 | 263 | if (pmd_none(*pmd)) { |
458a3e64 | 264 | pte_t *pte = (pte_t *) spp_getpage(); |
bb23e403 | 265 | pmd_populate_kernel(&init_mm, pmd, pte); |
458a3e64 | 266 | if (pte != pte_offset_kernel(pmd, 0)) |
10f22dde | 267 | printk(KERN_ERR "PAGETABLE BUG #02!\n"); |
1da177e4 | 268 | } |
458a3e64 TH |
269 | return pte_offset_kernel(pmd, vaddr); |
270 | } | |
271 | ||
272 | void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte) | |
273 | { | |
274 | pud_t *pud; | |
275 | pmd_t *pmd; | |
276 | pte_t *pte; | |
277 | ||
278 | pud = pud_page + pud_index(vaddr); | |
279 | pmd = fill_pmd(pud, vaddr); | |
280 | pte = fill_pte(pmd, vaddr); | |
1da177e4 | 281 | |
1da177e4 LT |
282 | set_pte(pte, new_pte); |
283 | ||
284 | /* | |
285 | * It's enough to flush this one mapping. | |
286 | * (PGE mappings get flushed as well) | |
287 | */ | |
288 | __flush_tlb_one(vaddr); | |
289 | } | |
290 | ||
458a3e64 | 291 | void set_pte_vaddr(unsigned long vaddr, pte_t pteval) |
0814e0ba EH |
292 | { |
293 | pgd_t *pgd; | |
294 | pud_t *pud_page; | |
295 | ||
296 | pr_debug("set_pte_vaddr %lx to %lx\n", vaddr, native_pte_val(pteval)); | |
297 | ||
298 | pgd = pgd_offset_k(vaddr); | |
299 | if (pgd_none(*pgd)) { | |
300 | printk(KERN_ERR | |
301 | "PGD FIXMAP MISSING, it should be setup in head.S!\n"); | |
302 | return; | |
303 | } | |
304 | pud_page = (pud_t*)pgd_page_vaddr(*pgd); | |
305 | set_pte_vaddr_pud(pud_page, vaddr, pteval); | |
306 | } | |
307 | ||
458a3e64 | 308 | pmd_t * __init populate_extra_pmd(unsigned long vaddr) |
11124411 TH |
309 | { |
310 | pgd_t *pgd; | |
311 | pud_t *pud; | |
312 | ||
313 | pgd = pgd_offset_k(vaddr); | |
458a3e64 TH |
314 | pud = fill_pud(pgd, vaddr); |
315 | return fill_pmd(pud, vaddr); | |
316 | } | |
317 | ||
318 | pte_t * __init populate_extra_pte(unsigned long vaddr) | |
319 | { | |
320 | pmd_t *pmd; | |
11124411 | 321 | |
458a3e64 TH |
322 | pmd = populate_extra_pmd(vaddr); |
323 | return fill_pte(pmd, vaddr); | |
11124411 TH |
324 | } |
325 | ||
3a9e189d JS |
326 | /* |
327 | * Create large page table mappings for a range of physical addresses. | |
328 | */ | |
329 | static void __init __init_extra_mapping(unsigned long phys, unsigned long size, | |
330 | pgprot_t prot) | |
331 | { | |
332 | pgd_t *pgd; | |
333 | pud_t *pud; | |
334 | pmd_t *pmd; | |
335 | ||
336 | BUG_ON((phys & ~PMD_MASK) || (size & ~PMD_MASK)); | |
337 | for (; size; phys += PMD_SIZE, size -= PMD_SIZE) { | |
338 | pgd = pgd_offset_k((unsigned long)__va(phys)); | |
339 | if (pgd_none(*pgd)) { | |
340 | pud = (pud_t *) spp_getpage(); | |
341 | set_pgd(pgd, __pgd(__pa(pud) | _KERNPG_TABLE | | |
342 | _PAGE_USER)); | |
343 | } | |
344 | pud = pud_offset(pgd, (unsigned long)__va(phys)); | |
345 | if (pud_none(*pud)) { | |
346 | pmd = (pmd_t *) spp_getpage(); | |
347 | set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE | | |
348 | _PAGE_USER)); | |
349 | } | |
350 | pmd = pmd_offset(pud, phys); | |
351 | BUG_ON(!pmd_none(*pmd)); | |
352 | set_pmd(pmd, __pmd(phys | pgprot_val(prot))); | |
353 | } | |
354 | } | |
355 | ||
356 | void __init init_extra_mapping_wb(unsigned long phys, unsigned long size) | |
357 | { | |
358 | __init_extra_mapping(phys, size, PAGE_KERNEL_LARGE); | |
359 | } | |
360 | ||
361 | void __init init_extra_mapping_uc(unsigned long phys, unsigned long size) | |
362 | { | |
363 | __init_extra_mapping(phys, size, PAGE_KERNEL_LARGE_NOCACHE); | |
364 | } | |
365 | ||
31eedd82 | 366 | /* |
88f3aec7 IM |
367 | * The head.S code sets up the kernel high mapping: |
368 | * | |
369 | * from __START_KERNEL_map to __START_KERNEL_map + size (== _end-_text) | |
31eedd82 | 370 | * |
1e3b3081 | 371 | * phys_base holds the negative offset to the kernel, which is added |
31eedd82 TG |
372 | * to the compile time generated pmds. This results in invalid pmds up |
373 | * to the point where we hit the physaddr 0 mapping. | |
374 | * | |
e5f15b45 YL |
375 | * We limit the mappings to the region from _text to _brk_end. _brk_end |
376 | * is rounded up to the 2MB boundary. This catches the invalid pmds as | |
31eedd82 TG |
377 | * well, as they are located before _text: |
378 | */ | |
379 | void __init cleanup_highmap(void) | |
380 | { | |
381 | unsigned long vaddr = __START_KERNEL_map; | |
10054230 | 382 | unsigned long vaddr_end = __START_KERNEL_map + KERNEL_IMAGE_SIZE; |
e5f15b45 | 383 | unsigned long end = roundup((unsigned long)_brk_end, PMD_SIZE) - 1; |
31eedd82 | 384 | pmd_t *pmd = level2_kernel_pgt; |
31eedd82 | 385 | |
10054230 YL |
386 | /* |
387 | * Native path, max_pfn_mapped is not set yet. | |
388 | * Xen has valid max_pfn_mapped set in | |
389 | * arch/x86/xen/mmu.c:xen_setup_kernel_pagetable(). | |
390 | */ | |
391 | if (max_pfn_mapped) | |
392 | vaddr_end = __START_KERNEL_map + (max_pfn_mapped << PAGE_SHIFT); | |
393 | ||
e5f15b45 | 394 | for (; vaddr + PMD_SIZE - 1 < vaddr_end; pmd++, vaddr += PMD_SIZE) { |
2884f110 | 395 | if (pmd_none(*pmd)) |
31eedd82 TG |
396 | continue; |
397 | if (vaddr < (unsigned long) _text || vaddr > end) | |
398 | set_pmd(pmd, __pmd(0)); | |
399 | } | |
400 | } | |
401 | ||
7b16eb89 | 402 | static unsigned long __meminit |
b27a43c1 SS |
403 | phys_pte_init(pte_t *pte_page, unsigned long addr, unsigned long end, |
404 | pgprot_t prot) | |
4f9c11dd | 405 | { |
eceb3632 | 406 | unsigned long pages = 0, next; |
7b16eb89 | 407 | unsigned long last_map_addr = end; |
4f9c11dd | 408 | int i; |
7b16eb89 | 409 | |
4f9c11dd JF |
410 | pte_t *pte = pte_page + pte_index(addr); |
411 | ||
eceb3632 YL |
412 | for (i = pte_index(addr); i < PTRS_PER_PTE; i++, addr = next, pte++) { |
413 | next = (addr & PAGE_MASK) + PAGE_SIZE; | |
4f9c11dd | 414 | if (addr >= end) { |
eceb3632 YL |
415 | if (!after_bootmem && |
416 | !e820_any_mapped(addr & PAGE_MASK, next, E820_RAM) && | |
417 | !e820_any_mapped(addr & PAGE_MASK, next, E820_RESERVED_KERN)) | |
418 | set_pte(pte, __pte(0)); | |
419 | continue; | |
4f9c11dd JF |
420 | } |
421 | ||
b27a43c1 SS |
422 | /* |
423 | * We will re-use the existing mapping. | |
424 | * Xen for example has some special requirements, like mapping | |
425 | * pagetable pages as RO. So assume someone who pre-setup | |
426 | * these mappings are more intelligent. | |
427 | */ | |
3afa3949 | 428 | if (pte_val(*pte)) { |
876ee61a JB |
429 | if (!after_bootmem) |
430 | pages++; | |
4f9c11dd | 431 | continue; |
3afa3949 | 432 | } |
4f9c11dd JF |
433 | |
434 | if (0) | |
435 | printk(" pte=%p addr=%lx pte=%016lx\n", | |
436 | pte, addr, pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL).pte); | |
4f9c11dd | 437 | pages++; |
b27a43c1 | 438 | set_pte(pte, pfn_pte(addr >> PAGE_SHIFT, prot)); |
7b16eb89 | 439 | last_map_addr = (addr & PAGE_MASK) + PAGE_SIZE; |
4f9c11dd | 440 | } |
a2699e47 | 441 | |
4f9c11dd | 442 | update_page_count(PG_LEVEL_4K, pages); |
7b16eb89 YL |
443 | |
444 | return last_map_addr; | |
4f9c11dd JF |
445 | } |
446 | ||
cc615032 | 447 | static unsigned long __meminit |
b50efd2a | 448 | phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end, |
b27a43c1 | 449 | unsigned long page_size_mask, pgprot_t prot) |
44df75e6 | 450 | { |
20167d34 | 451 | unsigned long pages = 0, next; |
7b16eb89 | 452 | unsigned long last_map_addr = end; |
ce0c0e50 | 453 | |
6ad91658 | 454 | int i = pmd_index(address); |
44df75e6 | 455 | |
20167d34 | 456 | for (; i < PTRS_PER_PMD; i++, address = next) { |
6ad91658 | 457 | pmd_t *pmd = pmd_page + pmd_index(address); |
4f9c11dd | 458 | pte_t *pte; |
b27a43c1 | 459 | pgprot_t new_prot = prot; |
44df75e6 | 460 | |
eceb3632 | 461 | next = (address & PMD_MASK) + PMD_SIZE; |
5f51e139 | 462 | if (address >= end) { |
eceb3632 YL |
463 | if (!after_bootmem && |
464 | !e820_any_mapped(address & PMD_MASK, next, E820_RAM) && | |
465 | !e820_any_mapped(address & PMD_MASK, next, E820_RESERVED_KERN)) | |
466 | set_pmd(pmd, __pmd(0)); | |
467 | continue; | |
44df75e6 | 468 | } |
6ad91658 | 469 | |
4f9c11dd | 470 | if (pmd_val(*pmd)) { |
8ae3a5a8 JB |
471 | if (!pmd_large(*pmd)) { |
472 | spin_lock(&init_mm.page_table_lock); | |
973dc4f3 | 473 | pte = (pte_t *)pmd_page_vaddr(*pmd); |
4b239f45 | 474 | last_map_addr = phys_pte_init(pte, address, |
b27a43c1 | 475 | end, prot); |
8ae3a5a8 | 476 | spin_unlock(&init_mm.page_table_lock); |
a2699e47 | 477 | continue; |
8ae3a5a8 | 478 | } |
b27a43c1 SS |
479 | /* |
480 | * If we are ok with PG_LEVEL_2M mapping, then we will | |
481 | * use the existing mapping, | |
482 | * | |
483 | * Otherwise, we will split the large page mapping but | |
484 | * use the same existing protection bits except for | |
485 | * large page, so that we don't violate Intel's TLB | |
486 | * Application note (317080) which says, while changing | |
487 | * the page sizes, new and old translations should | |
488 | * not differ with respect to page frame and | |
489 | * attributes. | |
490 | */ | |
3afa3949 | 491 | if (page_size_mask & (1 << PG_LEVEL_2M)) { |
876ee61a JB |
492 | if (!after_bootmem) |
493 | pages++; | |
20167d34 | 494 | last_map_addr = next; |
b27a43c1 | 495 | continue; |
3afa3949 | 496 | } |
b27a43c1 | 497 | new_prot = pte_pgprot(pte_clrhuge(*(pte_t *)pmd)); |
4f9c11dd JF |
498 | } |
499 | ||
b50efd2a | 500 | if (page_size_mask & (1<<PG_LEVEL_2M)) { |
4f9c11dd | 501 | pages++; |
8ae3a5a8 | 502 | spin_lock(&init_mm.page_table_lock); |
4f9c11dd | 503 | set_pte((pte_t *)pmd, |
960ddb4f | 504 | pfn_pte((address & PMD_MASK) >> PAGE_SHIFT, |
b27a43c1 | 505 | __pgprot(pgprot_val(prot) | _PAGE_PSE))); |
8ae3a5a8 | 506 | spin_unlock(&init_mm.page_table_lock); |
20167d34 | 507 | last_map_addr = next; |
6ad91658 | 508 | continue; |
4f9c11dd | 509 | } |
6ad91658 | 510 | |
868bf4d6 | 511 | pte = alloc_low_page(); |
b27a43c1 | 512 | last_map_addr = phys_pte_init(pte, address, end, new_prot); |
4f9c11dd | 513 | |
8ae3a5a8 | 514 | spin_lock(&init_mm.page_table_lock); |
868bf4d6 | 515 | pmd_populate_kernel(&init_mm, pmd, pte); |
8ae3a5a8 | 516 | spin_unlock(&init_mm.page_table_lock); |
44df75e6 | 517 | } |
ce0c0e50 | 518 | update_page_count(PG_LEVEL_2M, pages); |
7b16eb89 | 519 | return last_map_addr; |
44df75e6 MT |
520 | } |
521 | ||
cc615032 | 522 | static unsigned long __meminit |
b50efd2a YL |
523 | phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end, |
524 | unsigned long page_size_mask) | |
14a62c34 | 525 | { |
20167d34 | 526 | unsigned long pages = 0, next; |
cc615032 | 527 | unsigned long last_map_addr = end; |
6ad91658 | 528 | int i = pud_index(addr); |
44df75e6 | 529 | |
20167d34 | 530 | for (; i < PTRS_PER_PUD; i++, addr = next) { |
6ad91658 | 531 | pud_t *pud = pud_page + pud_index(addr); |
1da177e4 | 532 | pmd_t *pmd; |
b27a43c1 | 533 | pgprot_t prot = PAGE_KERNEL; |
1da177e4 | 534 | |
20167d34 | 535 | next = (addr & PUD_MASK) + PUD_SIZE; |
eceb3632 YL |
536 | if (addr >= end) { |
537 | if (!after_bootmem && | |
538 | !e820_any_mapped(addr & PUD_MASK, next, E820_RAM) && | |
539 | !e820_any_mapped(addr & PUD_MASK, next, E820_RESERVED_KERN)) | |
540 | set_pud(pud, __pud(0)); | |
1da177e4 | 541 | continue; |
14a62c34 | 542 | } |
1da177e4 | 543 | |
6ad91658 | 544 | if (pud_val(*pud)) { |
a2699e47 | 545 | if (!pud_large(*pud)) { |
973dc4f3 | 546 | pmd = pmd_offset(pud, 0); |
4b239f45 | 547 | last_map_addr = phys_pmd_init(pmd, addr, end, |
b27a43c1 | 548 | page_size_mask, prot); |
4b239f45 | 549 | __flush_tlb_all(); |
a2699e47 SS |
550 | continue; |
551 | } | |
b27a43c1 SS |
552 | /* |
553 | * If we are ok with PG_LEVEL_1G mapping, then we will | |
554 | * use the existing mapping. | |
555 | * | |
556 | * Otherwise, we will split the gbpage mapping but use | |
557 | * the same existing protection bits except for large | |
558 | * page, so that we don't violate Intel's TLB | |
559 | * Application note (317080) which says, while changing | |
560 | * the page sizes, new and old translations should | |
561 | * not differ with respect to page frame and | |
562 | * attributes. | |
563 | */ | |
3afa3949 | 564 | if (page_size_mask & (1 << PG_LEVEL_1G)) { |
876ee61a JB |
565 | if (!after_bootmem) |
566 | pages++; | |
20167d34 | 567 | last_map_addr = next; |
b27a43c1 | 568 | continue; |
3afa3949 | 569 | } |
b27a43c1 | 570 | prot = pte_pgprot(pte_clrhuge(*(pte_t *)pud)); |
ef925766 AK |
571 | } |
572 | ||
b50efd2a | 573 | if (page_size_mask & (1<<PG_LEVEL_1G)) { |
ce0c0e50 | 574 | pages++; |
8ae3a5a8 | 575 | spin_lock(&init_mm.page_table_lock); |
ef925766 | 576 | set_pte((pte_t *)pud, |
960ddb4f YL |
577 | pfn_pte((addr & PUD_MASK) >> PAGE_SHIFT, |
578 | PAGE_KERNEL_LARGE)); | |
8ae3a5a8 | 579 | spin_unlock(&init_mm.page_table_lock); |
20167d34 | 580 | last_map_addr = next; |
6ad91658 KM |
581 | continue; |
582 | } | |
583 | ||
868bf4d6 | 584 | pmd = alloc_low_page(); |
b27a43c1 SS |
585 | last_map_addr = phys_pmd_init(pmd, addr, end, page_size_mask, |
586 | prot); | |
8ae3a5a8 JB |
587 | |
588 | spin_lock(&init_mm.page_table_lock); | |
868bf4d6 | 589 | pud_populate(&init_mm, pud, pmd); |
44df75e6 | 590 | spin_unlock(&init_mm.page_table_lock); |
1da177e4 | 591 | } |
1a2b4412 | 592 | __flush_tlb_all(); |
a2699e47 | 593 | |
ce0c0e50 | 594 | update_page_count(PG_LEVEL_1G, pages); |
cc615032 | 595 | |
1a0db38e | 596 | return last_map_addr; |
14a62c34 | 597 | } |
1da177e4 | 598 | |
41d840e2 | 599 | unsigned long __meminit |
f765090a PE |
600 | kernel_physical_mapping_init(unsigned long start, |
601 | unsigned long end, | |
602 | unsigned long page_size_mask) | |
14a62c34 | 603 | { |
9b861528 | 604 | bool pgd_changed = false; |
b50efd2a | 605 | unsigned long next, last_map_addr = end; |
9b861528 | 606 | unsigned long addr; |
1da177e4 LT |
607 | |
608 | start = (unsigned long)__va(start); | |
609 | end = (unsigned long)__va(end); | |
1c5f50ee | 610 | addr = start; |
1da177e4 LT |
611 | |
612 | for (; start < end; start = next) { | |
44df75e6 MT |
613 | pgd_t *pgd = pgd_offset_k(start); |
614 | pud_t *pud; | |
615 | ||
c2bdee59 | 616 | next = (start & PGDIR_MASK) + PGDIR_SIZE; |
4f9c11dd JF |
617 | |
618 | if (pgd_val(*pgd)) { | |
973dc4f3 | 619 | pud = (pud_t *)pgd_page_vaddr(*pgd); |
4b239f45 | 620 | last_map_addr = phys_pud_init(pud, __pa(start), |
b50efd2a | 621 | __pa(end), page_size_mask); |
4f9c11dd JF |
622 | continue; |
623 | } | |
624 | ||
868bf4d6 | 625 | pud = alloc_low_page(); |
c2bdee59 | 626 | last_map_addr = phys_pud_init(pud, __pa(start), __pa(end), |
b50efd2a | 627 | page_size_mask); |
8ae3a5a8 JB |
628 | |
629 | spin_lock(&init_mm.page_table_lock); | |
868bf4d6 | 630 | pgd_populate(&init_mm, pgd, pud); |
8ae3a5a8 | 631 | spin_unlock(&init_mm.page_table_lock); |
9b861528 | 632 | pgd_changed = true; |
14a62c34 | 633 | } |
9b861528 HL |
634 | |
635 | if (pgd_changed) | |
f73568a0 | 636 | sync_global_pgds(addr, end - 1); |
9b861528 | 637 | |
a2699e47 | 638 | __flush_tlb_all(); |
1da177e4 | 639 | |
b50efd2a YL |
640 | return last_map_addr; |
641 | } | |
7b16eb89 | 642 | |
2b97690f | 643 | #ifndef CONFIG_NUMA |
d8fc3afc | 644 | void __init initmem_init(void) |
1f75d7e3 | 645 | { |
0608f70c | 646 | memblock_set_node(0, (phys_addr_t)ULLONG_MAX, 0); |
1f75d7e3 | 647 | } |
3551f88f | 648 | #endif |
1f75d7e3 | 649 | |
1da177e4 LT |
650 | void __init paging_init(void) |
651 | { | |
3551f88f | 652 | sparse_memory_present_with_active_regions(MAX_NUMNODES); |
44df75e6 | 653 | sparse_init(); |
44b57280 YL |
654 | |
655 | /* | |
656 | * clear the default setting with node 0 | |
657 | * note: don't use nodes_clear here, that is really clearing when | |
658 | * numa support is not compiled in, and later node_set_state | |
659 | * will not set it back. | |
660 | */ | |
4b0ef1fe LJ |
661 | node_clear_state(0, N_MEMORY); |
662 | if (N_MEMORY != N_NORMAL_MEMORY) | |
663 | node_clear_state(0, N_NORMAL_MEMORY); | |
44b57280 | 664 | |
4c0b2e5f | 665 | zone_sizes_init(); |
1da177e4 | 666 | } |
1da177e4 | 667 | |
44df75e6 MT |
668 | /* |
669 | * Memory hotplug specific functions | |
44df75e6 | 670 | */ |
bc02af93 | 671 | #ifdef CONFIG_MEMORY_HOTPLUG |
ea085417 SZ |
672 | /* |
673 | * After memory hotplug the variables max_pfn, max_low_pfn and high_memory need | |
674 | * updating. | |
675 | */ | |
676 | static void update_end_of_memory_vars(u64 start, u64 size) | |
677 | { | |
678 | unsigned long end_pfn = PFN_UP(start + size); | |
679 | ||
680 | if (end_pfn > max_pfn) { | |
681 | max_pfn = end_pfn; | |
682 | max_low_pfn = end_pfn; | |
683 | high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1; | |
684 | } | |
685 | } | |
686 | ||
9d99aaa3 AK |
687 | /* |
688 | * Memory is added always to NORMAL zone. This means you will never get | |
689 | * additional DMA/DMA32 memory. | |
690 | */ | |
bc02af93 | 691 | int arch_add_memory(int nid, u64 start, u64 size) |
44df75e6 | 692 | { |
bc02af93 | 693 | struct pglist_data *pgdat = NODE_DATA(nid); |
776ed98b | 694 | struct zone *zone = pgdat->node_zones + ZONE_NORMAL; |
66520ebc | 695 | unsigned long start_pfn = start >> PAGE_SHIFT; |
44df75e6 MT |
696 | unsigned long nr_pages = size >> PAGE_SHIFT; |
697 | int ret; | |
698 | ||
66520ebc | 699 | init_memory_mapping(start, start + size); |
45e0b78b | 700 | |
c04fc586 | 701 | ret = __add_pages(nid, zone, start_pfn, nr_pages); |
fe8b868e | 702 | WARN_ON_ONCE(ret); |
44df75e6 | 703 | |
ea085417 SZ |
704 | /* update max_pfn, max_low_pfn and high_memory */ |
705 | update_end_of_memory_vars(start, size); | |
706 | ||
44df75e6 | 707 | return ret; |
44df75e6 | 708 | } |
bc02af93 | 709 | EXPORT_SYMBOL_GPL(arch_add_memory); |
44df75e6 | 710 | |
ae9aae9e WC |
711 | #define PAGE_INUSE 0xFD |
712 | ||
713 | static void __meminit free_pagetable(struct page *page, int order) | |
714 | { | |
715 | struct zone *zone; | |
716 | bool bootmem = false; | |
717 | unsigned long magic; | |
718 | unsigned int nr_pages = 1 << order; | |
719 | ||
720 | /* bootmem page has reserved flag */ | |
721 | if (PageReserved(page)) { | |
722 | __ClearPageReserved(page); | |
723 | bootmem = true; | |
724 | ||
725 | magic = (unsigned long)page->lru.next; | |
726 | if (magic == SECTION_INFO || magic == MIX_SECTION_INFO) { | |
727 | while (nr_pages--) | |
728 | put_page_bootmem(page++); | |
729 | } else | |
730 | __free_pages_bootmem(page, order); | |
731 | } else | |
732 | free_pages((unsigned long)page_address(page), order); | |
733 | ||
734 | /* | |
735 | * SECTION_INFO pages and MIX_SECTION_INFO pages | |
736 | * are all allocated by bootmem. | |
737 | */ | |
738 | if (bootmem) { | |
739 | zone = page_zone(page); | |
740 | zone_span_writelock(zone); | |
741 | zone->present_pages += nr_pages; | |
742 | zone_span_writeunlock(zone); | |
743 | totalram_pages += nr_pages; | |
744 | } | |
745 | } | |
746 | ||
747 | static void __meminit free_pte_table(pte_t *pte_start, pmd_t *pmd) | |
748 | { | |
749 | pte_t *pte; | |
750 | int i; | |
751 | ||
752 | for (i = 0; i < PTRS_PER_PTE; i++) { | |
753 | pte = pte_start + i; | |
754 | if (pte_val(*pte)) | |
755 | return; | |
756 | } | |
757 | ||
758 | /* free a pte talbe */ | |
759 | free_pagetable(pmd_page(*pmd), 0); | |
760 | spin_lock(&init_mm.page_table_lock); | |
761 | pmd_clear(pmd); | |
762 | spin_unlock(&init_mm.page_table_lock); | |
763 | } | |
764 | ||
765 | static void __meminit free_pmd_table(pmd_t *pmd_start, pud_t *pud) | |
766 | { | |
767 | pmd_t *pmd; | |
768 | int i; | |
769 | ||
770 | for (i = 0; i < PTRS_PER_PMD; i++) { | |
771 | pmd = pmd_start + i; | |
772 | if (pmd_val(*pmd)) | |
773 | return; | |
774 | } | |
775 | ||
776 | /* free a pmd talbe */ | |
777 | free_pagetable(pud_page(*pud), 0); | |
778 | spin_lock(&init_mm.page_table_lock); | |
779 | pud_clear(pud); | |
780 | spin_unlock(&init_mm.page_table_lock); | |
781 | } | |
782 | ||
783 | /* Return true if pgd is changed, otherwise return false. */ | |
784 | static bool __meminit free_pud_table(pud_t *pud_start, pgd_t *pgd) | |
785 | { | |
786 | pud_t *pud; | |
787 | int i; | |
788 | ||
789 | for (i = 0; i < PTRS_PER_PUD; i++) { | |
790 | pud = pud_start + i; | |
791 | if (pud_val(*pud)) | |
792 | return false; | |
793 | } | |
794 | ||
795 | /* free a pud table */ | |
796 | free_pagetable(pgd_page(*pgd), 0); | |
797 | spin_lock(&init_mm.page_table_lock); | |
798 | pgd_clear(pgd); | |
799 | spin_unlock(&init_mm.page_table_lock); | |
800 | ||
801 | return true; | |
802 | } | |
803 | ||
804 | static void __meminit | |
805 | remove_pte_table(pte_t *pte_start, unsigned long addr, unsigned long end, | |
806 | bool direct) | |
807 | { | |
808 | unsigned long next, pages = 0; | |
809 | pte_t *pte; | |
810 | void *page_addr; | |
811 | phys_addr_t phys_addr; | |
812 | ||
813 | pte = pte_start + pte_index(addr); | |
814 | for (; addr < end; addr = next, pte++) { | |
815 | next = (addr + PAGE_SIZE) & PAGE_MASK; | |
816 | if (next > end) | |
817 | next = end; | |
818 | ||
819 | if (!pte_present(*pte)) | |
820 | continue; | |
821 | ||
822 | /* | |
823 | * We mapped [0,1G) memory as identity mapping when | |
824 | * initializing, in arch/x86/kernel/head_64.S. These | |
825 | * pagetables cannot be removed. | |
826 | */ | |
827 | phys_addr = pte_val(*pte) + (addr & PAGE_MASK); | |
828 | if (phys_addr < (phys_addr_t)0x40000000) | |
829 | return; | |
830 | ||
831 | if (IS_ALIGNED(addr, PAGE_SIZE) && | |
832 | IS_ALIGNED(next, PAGE_SIZE)) { | |
833 | /* | |
834 | * Do not free direct mapping pages since they were | |
835 | * freed when offlining, or simplely not in use. | |
836 | */ | |
837 | if (!direct) | |
838 | free_pagetable(pte_page(*pte), 0); | |
839 | ||
840 | spin_lock(&init_mm.page_table_lock); | |
841 | pte_clear(&init_mm, addr, pte); | |
842 | spin_unlock(&init_mm.page_table_lock); | |
843 | ||
844 | /* For non-direct mapping, pages means nothing. */ | |
845 | pages++; | |
846 | } else { | |
847 | /* | |
848 | * If we are here, we are freeing vmemmap pages since | |
849 | * direct mapped memory ranges to be freed are aligned. | |
850 | * | |
851 | * If we are not removing the whole page, it means | |
852 | * other page structs in this page are being used and | |
853 | * we canot remove them. So fill the unused page_structs | |
854 | * with 0xFD, and remove the page when it is wholly | |
855 | * filled with 0xFD. | |
856 | */ | |
857 | memset((void *)addr, PAGE_INUSE, next - addr); | |
858 | ||
859 | page_addr = page_address(pte_page(*pte)); | |
860 | if (!memchr_inv(page_addr, PAGE_INUSE, PAGE_SIZE)) { | |
861 | free_pagetable(pte_page(*pte), 0); | |
862 | ||
863 | spin_lock(&init_mm.page_table_lock); | |
864 | pte_clear(&init_mm, addr, pte); | |
865 | spin_unlock(&init_mm.page_table_lock); | |
866 | } | |
867 | } | |
868 | } | |
869 | ||
870 | /* Call free_pte_table() in remove_pmd_table(). */ | |
871 | flush_tlb_all(); | |
872 | if (direct) | |
873 | update_page_count(PG_LEVEL_4K, -pages); | |
874 | } | |
875 | ||
876 | static void __meminit | |
877 | remove_pmd_table(pmd_t *pmd_start, unsigned long addr, unsigned long end, | |
878 | bool direct) | |
879 | { | |
880 | unsigned long next, pages = 0; | |
881 | pte_t *pte_base; | |
882 | pmd_t *pmd; | |
883 | void *page_addr; | |
884 | ||
885 | pmd = pmd_start + pmd_index(addr); | |
886 | for (; addr < end; addr = next, pmd++) { | |
887 | next = pmd_addr_end(addr, end); | |
888 | ||
889 | if (!pmd_present(*pmd)) | |
890 | continue; | |
891 | ||
892 | if (pmd_large(*pmd)) { | |
893 | if (IS_ALIGNED(addr, PMD_SIZE) && | |
894 | IS_ALIGNED(next, PMD_SIZE)) { | |
895 | if (!direct) | |
896 | free_pagetable(pmd_page(*pmd), | |
897 | get_order(PMD_SIZE)); | |
898 | ||
899 | spin_lock(&init_mm.page_table_lock); | |
900 | pmd_clear(pmd); | |
901 | spin_unlock(&init_mm.page_table_lock); | |
902 | pages++; | |
903 | } else { | |
904 | /* If here, we are freeing vmemmap pages. */ | |
905 | memset((void *)addr, PAGE_INUSE, next - addr); | |
906 | ||
907 | page_addr = page_address(pmd_page(*pmd)); | |
908 | if (!memchr_inv(page_addr, PAGE_INUSE, | |
909 | PMD_SIZE)) { | |
910 | free_pagetable(pmd_page(*pmd), | |
911 | get_order(PMD_SIZE)); | |
912 | ||
913 | spin_lock(&init_mm.page_table_lock); | |
914 | pmd_clear(pmd); | |
915 | spin_unlock(&init_mm.page_table_lock); | |
916 | } | |
917 | } | |
918 | ||
919 | continue; | |
920 | } | |
921 | ||
922 | pte_base = (pte_t *)pmd_page_vaddr(*pmd); | |
923 | remove_pte_table(pte_base, addr, next, direct); | |
924 | free_pte_table(pte_base, pmd); | |
925 | } | |
926 | ||
927 | /* Call free_pmd_table() in remove_pud_table(). */ | |
928 | if (direct) | |
929 | update_page_count(PG_LEVEL_2M, -pages); | |
930 | } | |
931 | ||
932 | static void __meminit | |
933 | remove_pud_table(pud_t *pud_start, unsigned long addr, unsigned long end, | |
934 | bool direct) | |
935 | { | |
936 | unsigned long next, pages = 0; | |
937 | pmd_t *pmd_base; | |
938 | pud_t *pud; | |
939 | void *page_addr; | |
940 | ||
941 | pud = pud_start + pud_index(addr); | |
942 | for (; addr < end; addr = next, pud++) { | |
943 | next = pud_addr_end(addr, end); | |
944 | ||
945 | if (!pud_present(*pud)) | |
946 | continue; | |
947 | ||
948 | if (pud_large(*pud)) { | |
949 | if (IS_ALIGNED(addr, PUD_SIZE) && | |
950 | IS_ALIGNED(next, PUD_SIZE)) { | |
951 | if (!direct) | |
952 | free_pagetable(pud_page(*pud), | |
953 | get_order(PUD_SIZE)); | |
954 | ||
955 | spin_lock(&init_mm.page_table_lock); | |
956 | pud_clear(pud); | |
957 | spin_unlock(&init_mm.page_table_lock); | |
958 | pages++; | |
959 | } else { | |
960 | /* If here, we are freeing vmemmap pages. */ | |
961 | memset((void *)addr, PAGE_INUSE, next - addr); | |
962 | ||
963 | page_addr = page_address(pud_page(*pud)); | |
964 | if (!memchr_inv(page_addr, PAGE_INUSE, | |
965 | PUD_SIZE)) { | |
966 | free_pagetable(pud_page(*pud), | |
967 | get_order(PUD_SIZE)); | |
968 | ||
969 | spin_lock(&init_mm.page_table_lock); | |
970 | pud_clear(pud); | |
971 | spin_unlock(&init_mm.page_table_lock); | |
972 | } | |
973 | } | |
974 | ||
975 | continue; | |
976 | } | |
977 | ||
978 | pmd_base = (pmd_t *)pud_page_vaddr(*pud); | |
979 | remove_pmd_table(pmd_base, addr, next, direct); | |
980 | free_pmd_table(pmd_base, pud); | |
981 | } | |
982 | ||
983 | if (direct) | |
984 | update_page_count(PG_LEVEL_1G, -pages); | |
985 | } | |
986 | ||
987 | /* start and end are both virtual address. */ | |
988 | static void __meminit | |
989 | remove_pagetable(unsigned long start, unsigned long end, bool direct) | |
990 | { | |
991 | unsigned long next; | |
992 | pgd_t *pgd; | |
993 | pud_t *pud; | |
994 | bool pgd_changed = false; | |
995 | ||
996 | for (; start < end; start = next) { | |
997 | next = pgd_addr_end(start, end); | |
998 | ||
999 | pgd = pgd_offset_k(start); | |
1000 | if (!pgd_present(*pgd)) | |
1001 | continue; | |
1002 | ||
1003 | pud = (pud_t *)pgd_page_vaddr(*pgd); | |
1004 | remove_pud_table(pud, start, next, direct); | |
1005 | if (free_pud_table(pud, pgd)) | |
1006 | pgd_changed = true; | |
1007 | } | |
1008 | ||
1009 | if (pgd_changed) | |
1010 | sync_global_pgds(start, end - 1); | |
1011 | ||
1012 | flush_tlb_all(); | |
1013 | } | |
1014 | ||
0aad818b | 1015 | void __ref vmemmap_free(unsigned long start, unsigned long end) |
0197518c | 1016 | { |
0197518c TC |
1017 | remove_pagetable(start, end, false); |
1018 | } | |
1019 | ||
587ff8c4 | 1020 | #ifdef CONFIG_MEMORY_HOTREMOVE |
bbcab878 TC |
1021 | static void __meminit |
1022 | kernel_physical_mapping_remove(unsigned long start, unsigned long end) | |
1023 | { | |
1024 | start = (unsigned long)__va(start); | |
1025 | end = (unsigned long)__va(end); | |
1026 | ||
1027 | remove_pagetable(start, end, true); | |
1028 | } | |
1029 | ||
24d335ca WC |
1030 | int __ref arch_remove_memory(u64 start, u64 size) |
1031 | { | |
1032 | unsigned long start_pfn = start >> PAGE_SHIFT; | |
1033 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
1034 | struct zone *zone; | |
1035 | int ret; | |
1036 | ||
1037 | zone = page_zone(pfn_to_page(start_pfn)); | |
bbcab878 | 1038 | kernel_physical_mapping_remove(start, start + size); |
24d335ca WC |
1039 | ret = __remove_pages(zone, start_pfn, nr_pages); |
1040 | WARN_ON_ONCE(ret); | |
1041 | ||
1042 | return ret; | |
1043 | } | |
1044 | #endif | |
45e0b78b KM |
1045 | #endif /* CONFIG_MEMORY_HOTPLUG */ |
1046 | ||
81ac3ad9 | 1047 | static struct kcore_list kcore_vsyscall; |
1da177e4 | 1048 | |
94b43c3d YL |
1049 | static void __init register_page_bootmem_info(void) |
1050 | { | |
1051 | #ifdef CONFIG_NUMA | |
1052 | int i; | |
1053 | ||
1054 | for_each_online_node(i) | |
1055 | register_page_bootmem_info_node(NODE_DATA(i)); | |
1056 | #endif | |
1057 | } | |
1058 | ||
1da177e4 LT |
1059 | void __init mem_init(void) |
1060 | { | |
0a43e4bf | 1061 | long codesize, reservedpages, datasize, initsize; |
11a6b0c9 | 1062 | unsigned long absent_pages; |
1da177e4 | 1063 | |
0dc243ae | 1064 | pci_iommu_alloc(); |
1da177e4 | 1065 | |
48ddb154 | 1066 | /* clear_bss() already clear the empty_zero_page */ |
1da177e4 | 1067 | |
94b43c3d | 1068 | register_page_bootmem_info(); |
bced0e32 JL |
1069 | |
1070 | /* this will put all memory onto the freelists */ | |
0a43e4bf | 1071 | totalram_pages = free_all_bootmem(); |
11a6b0c9 YL |
1072 | |
1073 | absent_pages = absent_pages_in_range(0, max_pfn); | |
1074 | reservedpages = max_pfn - totalram_pages - absent_pages; | |
1da177e4 LT |
1075 | after_bootmem = 1; |
1076 | ||
1077 | codesize = (unsigned long) &_etext - (unsigned long) &_text; | |
1078 | datasize = (unsigned long) &_edata - (unsigned long) &_etext; | |
1079 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; | |
1080 | ||
1081 | /* Register memory areas for /proc/kcore */ | |
14a62c34 | 1082 | kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START, |
c30bb2a2 | 1083 | VSYSCALL_END - VSYSCALL_START, KCORE_OTHER); |
1da177e4 | 1084 | |
10f22dde | 1085 | printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, " |
11a6b0c9 | 1086 | "%ldk absent, %ldk reserved, %ldk data, %ldk init)\n", |
cc013a88 | 1087 | nr_free_pages() << (PAGE_SHIFT-10), |
c987d12f | 1088 | max_pfn << (PAGE_SHIFT-10), |
1da177e4 | 1089 | codesize >> 10, |
11a6b0c9 | 1090 | absent_pages << (PAGE_SHIFT-10), |
1da177e4 LT |
1091 | reservedpages << (PAGE_SHIFT-10), |
1092 | datasize >> 10, | |
1093 | initsize >> 10); | |
1da177e4 LT |
1094 | } |
1095 | ||
67df197b | 1096 | #ifdef CONFIG_DEBUG_RODATA |
edeed305 AV |
1097 | const int rodata_test_data = 0xC3; |
1098 | EXPORT_SYMBOL_GPL(rodata_test_data); | |
67df197b | 1099 | |
502f6604 | 1100 | int kernel_set_to_readonly; |
16239630 SR |
1101 | |
1102 | void set_kernel_text_rw(void) | |
1103 | { | |
b9af7c0d | 1104 | unsigned long start = PFN_ALIGN(_text); |
e7d23dde | 1105 | unsigned long end = PFN_ALIGN(__stop___ex_table); |
16239630 SR |
1106 | |
1107 | if (!kernel_set_to_readonly) | |
1108 | return; | |
1109 | ||
1110 | pr_debug("Set kernel text: %lx - %lx for read write\n", | |
1111 | start, end); | |
1112 | ||
e7d23dde SS |
1113 | /* |
1114 | * Make the kernel identity mapping for text RW. Kernel text | |
1115 | * mapping will always be RO. Refer to the comment in | |
1116 | * static_protections() in pageattr.c | |
1117 | */ | |
16239630 SR |
1118 | set_memory_rw(start, (end - start) >> PAGE_SHIFT); |
1119 | } | |
1120 | ||
1121 | void set_kernel_text_ro(void) | |
1122 | { | |
b9af7c0d | 1123 | unsigned long start = PFN_ALIGN(_text); |
e7d23dde | 1124 | unsigned long end = PFN_ALIGN(__stop___ex_table); |
16239630 SR |
1125 | |
1126 | if (!kernel_set_to_readonly) | |
1127 | return; | |
1128 | ||
1129 | pr_debug("Set kernel text: %lx - %lx for read only\n", | |
1130 | start, end); | |
1131 | ||
e7d23dde SS |
1132 | /* |
1133 | * Set the kernel identity mapping for text RO. | |
1134 | */ | |
16239630 SR |
1135 | set_memory_ro(start, (end - start) >> PAGE_SHIFT); |
1136 | } | |
1137 | ||
67df197b AV |
1138 | void mark_rodata_ro(void) |
1139 | { | |
74e08179 | 1140 | unsigned long start = PFN_ALIGN(_text); |
fc8d7826 | 1141 | unsigned long rodata_start = PFN_ALIGN(__start_rodata); |
74e08179 | 1142 | unsigned long end = (unsigned long) &__end_rodata_hpage_align; |
fc8d7826 AD |
1143 | unsigned long text_end = PFN_ALIGN(&__stop___ex_table); |
1144 | unsigned long rodata_end = PFN_ALIGN(&__end_rodata); | |
72212675 | 1145 | unsigned long all_end = PFN_ALIGN(&_end); |
8f0f996e | 1146 | |
6fb14755 | 1147 | printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n", |
e3ebadd9 | 1148 | (end - start) >> 10); |
984bb80d AV |
1149 | set_memory_ro(start, (end - start) >> PAGE_SHIFT); |
1150 | ||
16239630 SR |
1151 | kernel_set_to_readonly = 1; |
1152 | ||
984bb80d | 1153 | /* |
72212675 YL |
1154 | * The rodata/data/bss/brk section (but not the kernel text!) |
1155 | * should also be not-executable. | |
984bb80d | 1156 | */ |
72212675 | 1157 | set_memory_nx(rodata_start, (all_end - rodata_start) >> PAGE_SHIFT); |
67df197b | 1158 | |
1a487252 AV |
1159 | rodata_test(); |
1160 | ||
0c42f392 | 1161 | #ifdef CONFIG_CPA_DEBUG |
10f22dde | 1162 | printk(KERN_INFO "Testing CPA: undo %lx-%lx\n", start, end); |
6d238cc4 | 1163 | set_memory_rw(start, (end-start) >> PAGE_SHIFT); |
0c42f392 | 1164 | |
10f22dde | 1165 | printk(KERN_INFO "Testing CPA: again\n"); |
6d238cc4 | 1166 | set_memory_ro(start, (end-start) >> PAGE_SHIFT); |
0c42f392 | 1167 | #endif |
74e08179 SS |
1168 | |
1169 | free_init_pages("unused kernel memory", | |
fc8d7826 AD |
1170 | (unsigned long) __va(__pa_symbol(text_end)), |
1171 | (unsigned long) __va(__pa_symbol(rodata_start))); | |
1172 | ||
74e08179 | 1173 | free_init_pages("unused kernel memory", |
fc8d7826 AD |
1174 | (unsigned long) __va(__pa_symbol(rodata_end)), |
1175 | (unsigned long) __va(__pa_symbol(_sdata))); | |
67df197b | 1176 | } |
4e4eee0e | 1177 | |
67df197b AV |
1178 | #endif |
1179 | ||
14a62c34 TG |
1180 | int kern_addr_valid(unsigned long addr) |
1181 | { | |
1da177e4 | 1182 | unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT; |
14a62c34 TG |
1183 | pgd_t *pgd; |
1184 | pud_t *pud; | |
1185 | pmd_t *pmd; | |
1186 | pte_t *pte; | |
1da177e4 LT |
1187 | |
1188 | if (above != 0 && above != -1UL) | |
14a62c34 TG |
1189 | return 0; |
1190 | ||
1da177e4 LT |
1191 | pgd = pgd_offset_k(addr); |
1192 | if (pgd_none(*pgd)) | |
1193 | return 0; | |
1194 | ||
1195 | pud = pud_offset(pgd, addr); | |
1196 | if (pud_none(*pud)) | |
14a62c34 | 1197 | return 0; |
1da177e4 | 1198 | |
0ee364eb MG |
1199 | if (pud_large(*pud)) |
1200 | return pfn_valid(pud_pfn(*pud)); | |
1201 | ||
1da177e4 LT |
1202 | pmd = pmd_offset(pud, addr); |
1203 | if (pmd_none(*pmd)) | |
1204 | return 0; | |
14a62c34 | 1205 | |
1da177e4 LT |
1206 | if (pmd_large(*pmd)) |
1207 | return pfn_valid(pmd_pfn(*pmd)); | |
1208 | ||
1209 | pte = pte_offset_kernel(pmd, addr); | |
1210 | if (pte_none(*pte)) | |
1211 | return 0; | |
14a62c34 | 1212 | |
1da177e4 LT |
1213 | return pfn_valid(pte_pfn(*pte)); |
1214 | } | |
1215 | ||
14a62c34 TG |
1216 | /* |
1217 | * A pseudo VMA to allow ptrace access for the vsyscall page. This only | |
1218 | * covers the 64bit vsyscall page now. 32bit has a real VMA now and does | |
1219 | * not need special handling anymore: | |
1220 | */ | |
1da177e4 | 1221 | static struct vm_area_struct gate_vma = { |
14a62c34 TG |
1222 | .vm_start = VSYSCALL_START, |
1223 | .vm_end = VSYSCALL_START + (VSYSCALL_MAPPED_PAGES * PAGE_SIZE), | |
1224 | .vm_page_prot = PAGE_READONLY_EXEC, | |
1225 | .vm_flags = VM_READ | VM_EXEC | |
1da177e4 LT |
1226 | }; |
1227 | ||
31db58b3 | 1228 | struct vm_area_struct *get_gate_vma(struct mm_struct *mm) |
1da177e4 LT |
1229 | { |
1230 | #ifdef CONFIG_IA32_EMULATION | |
31db58b3 | 1231 | if (!mm || mm->context.ia32_compat) |
1e014410 | 1232 | return NULL; |
1da177e4 LT |
1233 | #endif |
1234 | return &gate_vma; | |
1235 | } | |
1236 | ||
83b964bb | 1237 | int in_gate_area(struct mm_struct *mm, unsigned long addr) |
1da177e4 | 1238 | { |
83b964bb | 1239 | struct vm_area_struct *vma = get_gate_vma(mm); |
14a62c34 | 1240 | |
1e014410 AK |
1241 | if (!vma) |
1242 | return 0; | |
14a62c34 | 1243 | |
1da177e4 LT |
1244 | return (addr >= vma->vm_start) && (addr < vma->vm_end); |
1245 | } | |
1246 | ||
14a62c34 | 1247 | /* |
cae5d390 SW |
1248 | * Use this when you have no reliable mm, typically from interrupt |
1249 | * context. It is less reliable than using a task's mm and may give | |
1250 | * false positives. | |
1da177e4 | 1251 | */ |
cae5d390 | 1252 | int in_gate_area_no_mm(unsigned long addr) |
1da177e4 | 1253 | { |
1e014410 | 1254 | return (addr >= VSYSCALL_START) && (addr < VSYSCALL_END); |
1da177e4 | 1255 | } |
2e1c49db | 1256 | |
2aae950b AK |
1257 | const char *arch_vma_name(struct vm_area_struct *vma) |
1258 | { | |
1259 | if (vma->vm_mm && vma->vm_start == (long)vma->vm_mm->context.vdso) | |
1260 | return "[vdso]"; | |
1261 | if (vma == &gate_vma) | |
1262 | return "[vsyscall]"; | |
1263 | return NULL; | |
1264 | } | |
0889eba5 | 1265 | |
1dc41aa6 | 1266 | #ifdef CONFIG_X86_UV |
1dc41aa6 NF |
1267 | unsigned long memory_block_size_bytes(void) |
1268 | { | |
1269 | if (is_uv_system()) { | |
1270 | printk(KERN_INFO "UV: memory block size 2GB\n"); | |
1271 | return 2UL * 1024 * 1024 * 1024; | |
1272 | } | |
1273 | return MIN_MEMORY_BLOCK_SIZE; | |
1274 | } | |
1275 | #endif | |
1276 | ||
0889eba5 CL |
1277 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
1278 | /* | |
1279 | * Initialise the sparsemem vmemmap using huge-pages at the PMD level. | |
1280 | */ | |
c2b91e2e YL |
1281 | static long __meminitdata addr_start, addr_end; |
1282 | static void __meminitdata *p_start, *p_end; | |
1283 | static int __meminitdata node_start; | |
1284 | ||
e8216da5 JW |
1285 | static int __meminit vmemmap_populate_hugepages(unsigned long start, |
1286 | unsigned long end, int node) | |
0889eba5 | 1287 | { |
0aad818b | 1288 | unsigned long addr; |
0889eba5 CL |
1289 | unsigned long next; |
1290 | pgd_t *pgd; | |
1291 | pud_t *pud; | |
1292 | pmd_t *pmd; | |
1293 | ||
0aad818b | 1294 | for (addr = start; addr < end; addr = next) { |
e8216da5 | 1295 | next = pmd_addr_end(addr, end); |
0889eba5 CL |
1296 | |
1297 | pgd = vmemmap_pgd_populate(addr, node); | |
1298 | if (!pgd) | |
1299 | return -ENOMEM; | |
14a62c34 | 1300 | |
0889eba5 CL |
1301 | pud = vmemmap_pud_populate(pgd, addr, node); |
1302 | if (!pud) | |
1303 | return -ENOMEM; | |
1304 | ||
e8216da5 JW |
1305 | pmd = pmd_offset(pud, addr); |
1306 | if (pmd_none(*pmd)) { | |
e8216da5 | 1307 | void *p; |
14a62c34 | 1308 | |
e8216da5 | 1309 | p = vmemmap_alloc_block_buf(PMD_SIZE, node); |
8e2cdbcb JW |
1310 | if (p) { |
1311 | pte_t entry; | |
1312 | ||
1313 | entry = pfn_pte(__pa(p) >> PAGE_SHIFT, | |
1314 | PAGE_KERNEL_LARGE); | |
1315 | set_pmd(pmd, __pmd(pte_val(entry))); | |
1316 | ||
1317 | /* check to see if we have contiguous blocks */ | |
1318 | if (p_end != p || node_start != node) { | |
1319 | if (p_start) | |
1320 | printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n", | |
1321 | addr_start, addr_end-1, p_start, p_end-1, node_start); | |
1322 | addr_start = addr; | |
1323 | node_start = node; | |
1324 | p_start = p; | |
1325 | } | |
7c934d39 | 1326 | |
8e2cdbcb JW |
1327 | addr_end = addr + PMD_SIZE; |
1328 | p_end = p + PMD_SIZE; | |
1329 | continue; | |
1330 | } | |
1331 | } else if (pmd_large(*pmd)) { | |
e8216da5 | 1332 | vmemmap_verify((pte_t *)pmd, node, addr, next); |
8e2cdbcb JW |
1333 | continue; |
1334 | } | |
1335 | pr_warn_once("vmemmap: falling back to regular page backing\n"); | |
1336 | if (vmemmap_populate_basepages(addr, next, node)) | |
1337 | return -ENOMEM; | |
0889eba5 | 1338 | } |
0889eba5 CL |
1339 | return 0; |
1340 | } | |
c2b91e2e | 1341 | |
e8216da5 JW |
1342 | int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node) |
1343 | { | |
1344 | int err; | |
1345 | ||
1346 | if (cpu_has_pse) | |
1347 | err = vmemmap_populate_hugepages(start, end, node); | |
1348 | else | |
1349 | err = vmemmap_populate_basepages(start, end, node); | |
1350 | if (!err) | |
1351 | sync_global_pgds(start, end - 1); | |
1352 | return err; | |
1353 | } | |
1354 | ||
46723bfa YI |
1355 | #if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HAVE_BOOTMEM_INFO_NODE) |
1356 | void register_page_bootmem_memmap(unsigned long section_nr, | |
1357 | struct page *start_page, unsigned long size) | |
1358 | { | |
1359 | unsigned long addr = (unsigned long)start_page; | |
1360 | unsigned long end = (unsigned long)(start_page + size); | |
1361 | unsigned long next; | |
1362 | pgd_t *pgd; | |
1363 | pud_t *pud; | |
1364 | pmd_t *pmd; | |
1365 | unsigned int nr_pages; | |
1366 | struct page *page; | |
1367 | ||
1368 | for (; addr < end; addr = next) { | |
1369 | pte_t *pte = NULL; | |
1370 | ||
1371 | pgd = pgd_offset_k(addr); | |
1372 | if (pgd_none(*pgd)) { | |
1373 | next = (addr + PAGE_SIZE) & PAGE_MASK; | |
1374 | continue; | |
1375 | } | |
1376 | get_page_bootmem(section_nr, pgd_page(*pgd), MIX_SECTION_INFO); | |
1377 | ||
1378 | pud = pud_offset(pgd, addr); | |
1379 | if (pud_none(*pud)) { | |
1380 | next = (addr + PAGE_SIZE) & PAGE_MASK; | |
1381 | continue; | |
1382 | } | |
1383 | get_page_bootmem(section_nr, pud_page(*pud), MIX_SECTION_INFO); | |
1384 | ||
1385 | if (!cpu_has_pse) { | |
1386 | next = (addr + PAGE_SIZE) & PAGE_MASK; | |
1387 | pmd = pmd_offset(pud, addr); | |
1388 | if (pmd_none(*pmd)) | |
1389 | continue; | |
1390 | get_page_bootmem(section_nr, pmd_page(*pmd), | |
1391 | MIX_SECTION_INFO); | |
1392 | ||
1393 | pte = pte_offset_kernel(pmd, addr); | |
1394 | if (pte_none(*pte)) | |
1395 | continue; | |
1396 | get_page_bootmem(section_nr, pte_page(*pte), | |
1397 | SECTION_INFO); | |
1398 | } else { | |
1399 | next = pmd_addr_end(addr, end); | |
1400 | ||
1401 | pmd = pmd_offset(pud, addr); | |
1402 | if (pmd_none(*pmd)) | |
1403 | continue; | |
1404 | ||
1405 | nr_pages = 1 << (get_order(PMD_SIZE)); | |
1406 | page = pmd_page(*pmd); | |
1407 | while (nr_pages--) | |
1408 | get_page_bootmem(section_nr, page++, | |
1409 | SECTION_INFO); | |
1410 | } | |
1411 | } | |
1412 | } | |
1413 | #endif | |
1414 | ||
c2b91e2e YL |
1415 | void __meminit vmemmap_populate_print_last(void) |
1416 | { | |
1417 | if (p_start) { | |
1418 | printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n", | |
1419 | addr_start, addr_end-1, p_start, p_end-1, node_start); | |
1420 | p_start = NULL; | |
1421 | p_end = NULL; | |
1422 | node_start = 0; | |
1423 | } | |
1424 | } | |
0889eba5 | 1425 | #endif |