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 | */ | |
9661d5bc | 181 | void sync_global_pgds(unsigned long start, unsigned long end, int removed) |
6afb5157 | 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 | ||
9661d5bc YI |
189 | /* |
190 | * When it is called after memory hot remove, pgd_none() | |
191 | * returns true. In this case (removed == 1), we must clear | |
192 | * the PGD entries in the local PGD level page. | |
193 | */ | |
194 | if (pgd_none(*pgd_ref) && !removed) | |
44235dcd JF |
195 | continue; |
196 | ||
a79e53d8 | 197 | spin_lock(&pgd_lock); |
44235dcd | 198 | list_for_each_entry(page, &pgd_list, lru) { |
be354f40 | 199 | pgd_t *pgd; |
617d34d9 JF |
200 | spinlock_t *pgt_lock; |
201 | ||
44235dcd | 202 | pgd = (pgd_t *)page_address(page) + pgd_index(address); |
a79e53d8 | 203 | /* the pgt_lock only for Xen */ |
617d34d9 JF |
204 | pgt_lock = &pgd_page_get_mm(page)->page_table_lock; |
205 | spin_lock(pgt_lock); | |
206 | ||
9661d5bc | 207 | if (!pgd_none(*pgd_ref) && !pgd_none(*pgd)) |
44235dcd JF |
208 | BUG_ON(pgd_page_vaddr(*pgd) |
209 | != pgd_page_vaddr(*pgd_ref)); | |
617d34d9 | 210 | |
9661d5bc YI |
211 | if (removed) { |
212 | if (pgd_none(*pgd_ref) && !pgd_none(*pgd)) | |
213 | pgd_clear(pgd); | |
214 | } else { | |
215 | if (pgd_none(*pgd)) | |
216 | set_pgd(pgd, *pgd_ref); | |
217 | } | |
218 | ||
617d34d9 | 219 | spin_unlock(pgt_lock); |
44235dcd | 220 | } |
a79e53d8 | 221 | spin_unlock(&pgd_lock); |
44235dcd | 222 | } |
6afb5157 HL |
223 | } |
224 | ||
8d6ea967 MS |
225 | /* |
226 | * NOTE: This function is marked __ref because it calls __init function | |
227 | * (alloc_bootmem_pages). It's safe to do it ONLY when after_bootmem == 0. | |
228 | */ | |
229 | static __ref void *spp_getpage(void) | |
14a62c34 | 230 | { |
1da177e4 | 231 | void *ptr; |
14a62c34 | 232 | |
1da177e4 | 233 | if (after_bootmem) |
9e730237 | 234 | ptr = (void *) get_zeroed_page(GFP_ATOMIC | __GFP_NOTRACK); |
1da177e4 LT |
235 | else |
236 | ptr = alloc_bootmem_pages(PAGE_SIZE); | |
14a62c34 TG |
237 | |
238 | if (!ptr || ((unsigned long)ptr & ~PAGE_MASK)) { | |
239 | panic("set_pte_phys: cannot allocate page data %s\n", | |
240 | after_bootmem ? "after bootmem" : ""); | |
241 | } | |
1da177e4 | 242 | |
10f22dde | 243 | pr_debug("spp_getpage %p\n", ptr); |
14a62c34 | 244 | |
1da177e4 | 245 | return ptr; |
14a62c34 | 246 | } |
1da177e4 | 247 | |
f254f390 | 248 | static pud_t *fill_pud(pgd_t *pgd, unsigned long vaddr) |
1da177e4 | 249 | { |
458a3e64 TH |
250 | if (pgd_none(*pgd)) { |
251 | pud_t *pud = (pud_t *)spp_getpage(); | |
252 | pgd_populate(&init_mm, pgd, pud); | |
253 | if (pud != pud_offset(pgd, 0)) | |
254 | printk(KERN_ERR "PAGETABLE BUG #00! %p <-> %p\n", | |
255 | pud, pud_offset(pgd, 0)); | |
256 | } | |
257 | return pud_offset(pgd, vaddr); | |
258 | } | |
1da177e4 | 259 | |
f254f390 | 260 | static pmd_t *fill_pmd(pud_t *pud, unsigned long vaddr) |
458a3e64 | 261 | { |
1da177e4 | 262 | if (pud_none(*pud)) { |
458a3e64 | 263 | pmd_t *pmd = (pmd_t *) spp_getpage(); |
bb23e403 | 264 | pud_populate(&init_mm, pud, pmd); |
458a3e64 | 265 | if (pmd != pmd_offset(pud, 0)) |
10f22dde | 266 | printk(KERN_ERR "PAGETABLE BUG #01! %p <-> %p\n", |
458a3e64 | 267 | pmd, pmd_offset(pud, 0)); |
1da177e4 | 268 | } |
458a3e64 TH |
269 | return pmd_offset(pud, vaddr); |
270 | } | |
271 | ||
f254f390 | 272 | static pte_t *fill_pte(pmd_t *pmd, unsigned long vaddr) |
458a3e64 | 273 | { |
1da177e4 | 274 | if (pmd_none(*pmd)) { |
458a3e64 | 275 | pte_t *pte = (pte_t *) spp_getpage(); |
bb23e403 | 276 | pmd_populate_kernel(&init_mm, pmd, pte); |
458a3e64 | 277 | if (pte != pte_offset_kernel(pmd, 0)) |
10f22dde | 278 | printk(KERN_ERR "PAGETABLE BUG #02!\n"); |
1da177e4 | 279 | } |
458a3e64 TH |
280 | return pte_offset_kernel(pmd, vaddr); |
281 | } | |
282 | ||
283 | void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte) | |
284 | { | |
285 | pud_t *pud; | |
286 | pmd_t *pmd; | |
287 | pte_t *pte; | |
288 | ||
289 | pud = pud_page + pud_index(vaddr); | |
290 | pmd = fill_pmd(pud, vaddr); | |
291 | pte = fill_pte(pmd, vaddr); | |
1da177e4 | 292 | |
1da177e4 LT |
293 | set_pte(pte, new_pte); |
294 | ||
295 | /* | |
296 | * It's enough to flush this one mapping. | |
297 | * (PGE mappings get flushed as well) | |
298 | */ | |
299 | __flush_tlb_one(vaddr); | |
300 | } | |
301 | ||
458a3e64 | 302 | void set_pte_vaddr(unsigned long vaddr, pte_t pteval) |
0814e0ba EH |
303 | { |
304 | pgd_t *pgd; | |
305 | pud_t *pud_page; | |
306 | ||
307 | pr_debug("set_pte_vaddr %lx to %lx\n", vaddr, native_pte_val(pteval)); | |
308 | ||
309 | pgd = pgd_offset_k(vaddr); | |
310 | if (pgd_none(*pgd)) { | |
311 | printk(KERN_ERR | |
312 | "PGD FIXMAP MISSING, it should be setup in head.S!\n"); | |
313 | return; | |
314 | } | |
315 | pud_page = (pud_t*)pgd_page_vaddr(*pgd); | |
316 | set_pte_vaddr_pud(pud_page, vaddr, pteval); | |
317 | } | |
318 | ||
458a3e64 | 319 | pmd_t * __init populate_extra_pmd(unsigned long vaddr) |
11124411 TH |
320 | { |
321 | pgd_t *pgd; | |
322 | pud_t *pud; | |
323 | ||
324 | pgd = pgd_offset_k(vaddr); | |
458a3e64 TH |
325 | pud = fill_pud(pgd, vaddr); |
326 | return fill_pmd(pud, vaddr); | |
327 | } | |
328 | ||
329 | pte_t * __init populate_extra_pte(unsigned long vaddr) | |
330 | { | |
331 | pmd_t *pmd; | |
11124411 | 332 | |
458a3e64 TH |
333 | pmd = populate_extra_pmd(vaddr); |
334 | return fill_pte(pmd, vaddr); | |
11124411 TH |
335 | } |
336 | ||
3a9e189d JS |
337 | /* |
338 | * Create large page table mappings for a range of physical addresses. | |
339 | */ | |
340 | static void __init __init_extra_mapping(unsigned long phys, unsigned long size, | |
341 | pgprot_t prot) | |
342 | { | |
343 | pgd_t *pgd; | |
344 | pud_t *pud; | |
345 | pmd_t *pmd; | |
346 | ||
347 | BUG_ON((phys & ~PMD_MASK) || (size & ~PMD_MASK)); | |
348 | for (; size; phys += PMD_SIZE, size -= PMD_SIZE) { | |
349 | pgd = pgd_offset_k((unsigned long)__va(phys)); | |
350 | if (pgd_none(*pgd)) { | |
351 | pud = (pud_t *) spp_getpage(); | |
352 | set_pgd(pgd, __pgd(__pa(pud) | _KERNPG_TABLE | | |
353 | _PAGE_USER)); | |
354 | } | |
355 | pud = pud_offset(pgd, (unsigned long)__va(phys)); | |
356 | if (pud_none(*pud)) { | |
357 | pmd = (pmd_t *) spp_getpage(); | |
358 | set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE | | |
359 | _PAGE_USER)); | |
360 | } | |
361 | pmd = pmd_offset(pud, phys); | |
362 | BUG_ON(!pmd_none(*pmd)); | |
363 | set_pmd(pmd, __pmd(phys | pgprot_val(prot))); | |
364 | } | |
365 | } | |
366 | ||
367 | void __init init_extra_mapping_wb(unsigned long phys, unsigned long size) | |
368 | { | |
369 | __init_extra_mapping(phys, size, PAGE_KERNEL_LARGE); | |
370 | } | |
371 | ||
372 | void __init init_extra_mapping_uc(unsigned long phys, unsigned long size) | |
373 | { | |
374 | __init_extra_mapping(phys, size, PAGE_KERNEL_LARGE_NOCACHE); | |
375 | } | |
376 | ||
31eedd82 | 377 | /* |
88f3aec7 IM |
378 | * The head.S code sets up the kernel high mapping: |
379 | * | |
380 | * from __START_KERNEL_map to __START_KERNEL_map + size (== _end-_text) | |
31eedd82 | 381 | * |
1e3b3081 | 382 | * phys_base holds the negative offset to the kernel, which is added |
31eedd82 TG |
383 | * to the compile time generated pmds. This results in invalid pmds up |
384 | * to the point where we hit the physaddr 0 mapping. | |
385 | * | |
e5f15b45 YL |
386 | * We limit the mappings to the region from _text to _brk_end. _brk_end |
387 | * is rounded up to the 2MB boundary. This catches the invalid pmds as | |
31eedd82 TG |
388 | * well, as they are located before _text: |
389 | */ | |
390 | void __init cleanup_highmap(void) | |
391 | { | |
392 | unsigned long vaddr = __START_KERNEL_map; | |
10054230 | 393 | unsigned long vaddr_end = __START_KERNEL_map + KERNEL_IMAGE_SIZE; |
e5f15b45 | 394 | unsigned long end = roundup((unsigned long)_brk_end, PMD_SIZE) - 1; |
31eedd82 | 395 | pmd_t *pmd = level2_kernel_pgt; |
31eedd82 | 396 | |
10054230 YL |
397 | /* |
398 | * Native path, max_pfn_mapped is not set yet. | |
399 | * Xen has valid max_pfn_mapped set in | |
400 | * arch/x86/xen/mmu.c:xen_setup_kernel_pagetable(). | |
401 | */ | |
402 | if (max_pfn_mapped) | |
403 | vaddr_end = __START_KERNEL_map + (max_pfn_mapped << PAGE_SHIFT); | |
404 | ||
e5f15b45 | 405 | for (; vaddr + PMD_SIZE - 1 < vaddr_end; pmd++, vaddr += PMD_SIZE) { |
2884f110 | 406 | if (pmd_none(*pmd)) |
31eedd82 TG |
407 | continue; |
408 | if (vaddr < (unsigned long) _text || vaddr > end) | |
409 | set_pmd(pmd, __pmd(0)); | |
410 | } | |
411 | } | |
412 | ||
7b16eb89 | 413 | static unsigned long __meminit |
b27a43c1 SS |
414 | phys_pte_init(pte_t *pte_page, unsigned long addr, unsigned long end, |
415 | pgprot_t prot) | |
4f9c11dd | 416 | { |
eceb3632 | 417 | unsigned long pages = 0, next; |
7b16eb89 | 418 | unsigned long last_map_addr = end; |
4f9c11dd | 419 | int i; |
7b16eb89 | 420 | |
4f9c11dd JF |
421 | pte_t *pte = pte_page + pte_index(addr); |
422 | ||
eceb3632 YL |
423 | for (i = pte_index(addr); i < PTRS_PER_PTE; i++, addr = next, pte++) { |
424 | next = (addr & PAGE_MASK) + PAGE_SIZE; | |
4f9c11dd | 425 | if (addr >= end) { |
eceb3632 YL |
426 | if (!after_bootmem && |
427 | !e820_any_mapped(addr & PAGE_MASK, next, E820_RAM) && | |
428 | !e820_any_mapped(addr & PAGE_MASK, next, E820_RESERVED_KERN)) | |
429 | set_pte(pte, __pte(0)); | |
430 | continue; | |
4f9c11dd JF |
431 | } |
432 | ||
b27a43c1 SS |
433 | /* |
434 | * We will re-use the existing mapping. | |
435 | * Xen for example has some special requirements, like mapping | |
436 | * pagetable pages as RO. So assume someone who pre-setup | |
437 | * these mappings are more intelligent. | |
438 | */ | |
3afa3949 | 439 | if (pte_val(*pte)) { |
876ee61a JB |
440 | if (!after_bootmem) |
441 | pages++; | |
4f9c11dd | 442 | continue; |
3afa3949 | 443 | } |
4f9c11dd JF |
444 | |
445 | if (0) | |
446 | printk(" pte=%p addr=%lx pte=%016lx\n", | |
447 | pte, addr, pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL).pte); | |
4f9c11dd | 448 | pages++; |
b27a43c1 | 449 | set_pte(pte, pfn_pte(addr >> PAGE_SHIFT, prot)); |
7b16eb89 | 450 | last_map_addr = (addr & PAGE_MASK) + PAGE_SIZE; |
4f9c11dd | 451 | } |
a2699e47 | 452 | |
4f9c11dd | 453 | update_page_count(PG_LEVEL_4K, pages); |
7b16eb89 YL |
454 | |
455 | return last_map_addr; | |
4f9c11dd JF |
456 | } |
457 | ||
cc615032 | 458 | static unsigned long __meminit |
b50efd2a | 459 | phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end, |
b27a43c1 | 460 | unsigned long page_size_mask, pgprot_t prot) |
44df75e6 | 461 | { |
20167d34 | 462 | unsigned long pages = 0, next; |
7b16eb89 | 463 | unsigned long last_map_addr = end; |
ce0c0e50 | 464 | |
6ad91658 | 465 | int i = pmd_index(address); |
44df75e6 | 466 | |
20167d34 | 467 | for (; i < PTRS_PER_PMD; i++, address = next) { |
6ad91658 | 468 | pmd_t *pmd = pmd_page + pmd_index(address); |
4f9c11dd | 469 | pte_t *pte; |
b27a43c1 | 470 | pgprot_t new_prot = prot; |
44df75e6 | 471 | |
eceb3632 | 472 | next = (address & PMD_MASK) + PMD_SIZE; |
5f51e139 | 473 | if (address >= end) { |
eceb3632 YL |
474 | if (!after_bootmem && |
475 | !e820_any_mapped(address & PMD_MASK, next, E820_RAM) && | |
476 | !e820_any_mapped(address & PMD_MASK, next, E820_RESERVED_KERN)) | |
477 | set_pmd(pmd, __pmd(0)); | |
478 | continue; | |
44df75e6 | 479 | } |
6ad91658 | 480 | |
4f9c11dd | 481 | if (pmd_val(*pmd)) { |
8ae3a5a8 JB |
482 | if (!pmd_large(*pmd)) { |
483 | spin_lock(&init_mm.page_table_lock); | |
973dc4f3 | 484 | pte = (pte_t *)pmd_page_vaddr(*pmd); |
4b239f45 | 485 | last_map_addr = phys_pte_init(pte, address, |
b27a43c1 | 486 | end, prot); |
8ae3a5a8 | 487 | spin_unlock(&init_mm.page_table_lock); |
a2699e47 | 488 | continue; |
8ae3a5a8 | 489 | } |
b27a43c1 SS |
490 | /* |
491 | * If we are ok with PG_LEVEL_2M mapping, then we will | |
492 | * use the existing mapping, | |
493 | * | |
494 | * Otherwise, we will split the large page mapping but | |
495 | * use the same existing protection bits except for | |
496 | * large page, so that we don't violate Intel's TLB | |
497 | * Application note (317080) which says, while changing | |
498 | * the page sizes, new and old translations should | |
499 | * not differ with respect to page frame and | |
500 | * attributes. | |
501 | */ | |
3afa3949 | 502 | if (page_size_mask & (1 << PG_LEVEL_2M)) { |
876ee61a JB |
503 | if (!after_bootmem) |
504 | pages++; | |
20167d34 | 505 | last_map_addr = next; |
b27a43c1 | 506 | continue; |
3afa3949 | 507 | } |
b27a43c1 | 508 | new_prot = pte_pgprot(pte_clrhuge(*(pte_t *)pmd)); |
4f9c11dd JF |
509 | } |
510 | ||
b50efd2a | 511 | if (page_size_mask & (1<<PG_LEVEL_2M)) { |
4f9c11dd | 512 | pages++; |
8ae3a5a8 | 513 | spin_lock(&init_mm.page_table_lock); |
4f9c11dd | 514 | set_pte((pte_t *)pmd, |
960ddb4f | 515 | pfn_pte((address & PMD_MASK) >> PAGE_SHIFT, |
b27a43c1 | 516 | __pgprot(pgprot_val(prot) | _PAGE_PSE))); |
8ae3a5a8 | 517 | spin_unlock(&init_mm.page_table_lock); |
20167d34 | 518 | last_map_addr = next; |
6ad91658 | 519 | continue; |
4f9c11dd | 520 | } |
6ad91658 | 521 | |
868bf4d6 | 522 | pte = alloc_low_page(); |
b27a43c1 | 523 | last_map_addr = phys_pte_init(pte, address, end, new_prot); |
4f9c11dd | 524 | |
8ae3a5a8 | 525 | spin_lock(&init_mm.page_table_lock); |
868bf4d6 | 526 | pmd_populate_kernel(&init_mm, pmd, pte); |
8ae3a5a8 | 527 | spin_unlock(&init_mm.page_table_lock); |
44df75e6 | 528 | } |
ce0c0e50 | 529 | update_page_count(PG_LEVEL_2M, pages); |
7b16eb89 | 530 | return last_map_addr; |
44df75e6 MT |
531 | } |
532 | ||
cc615032 | 533 | static unsigned long __meminit |
b50efd2a YL |
534 | phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end, |
535 | unsigned long page_size_mask) | |
14a62c34 | 536 | { |
20167d34 | 537 | unsigned long pages = 0, next; |
cc615032 | 538 | unsigned long last_map_addr = end; |
6ad91658 | 539 | int i = pud_index(addr); |
44df75e6 | 540 | |
20167d34 | 541 | for (; i < PTRS_PER_PUD; i++, addr = next) { |
6ad91658 | 542 | pud_t *pud = pud_page + pud_index(addr); |
1da177e4 | 543 | pmd_t *pmd; |
b27a43c1 | 544 | pgprot_t prot = PAGE_KERNEL; |
1da177e4 | 545 | |
20167d34 | 546 | next = (addr & PUD_MASK) + PUD_SIZE; |
eceb3632 YL |
547 | if (addr >= end) { |
548 | if (!after_bootmem && | |
549 | !e820_any_mapped(addr & PUD_MASK, next, E820_RAM) && | |
550 | !e820_any_mapped(addr & PUD_MASK, next, E820_RESERVED_KERN)) | |
551 | set_pud(pud, __pud(0)); | |
1da177e4 | 552 | continue; |
14a62c34 | 553 | } |
1da177e4 | 554 | |
6ad91658 | 555 | if (pud_val(*pud)) { |
a2699e47 | 556 | if (!pud_large(*pud)) { |
973dc4f3 | 557 | pmd = pmd_offset(pud, 0); |
4b239f45 | 558 | last_map_addr = phys_pmd_init(pmd, addr, end, |
b27a43c1 | 559 | page_size_mask, prot); |
4b239f45 | 560 | __flush_tlb_all(); |
a2699e47 SS |
561 | continue; |
562 | } | |
b27a43c1 SS |
563 | /* |
564 | * If we are ok with PG_LEVEL_1G mapping, then we will | |
565 | * use the existing mapping. | |
566 | * | |
567 | * Otherwise, we will split the gbpage mapping but use | |
568 | * the same existing protection bits except for large | |
569 | * page, so that we don't violate Intel's TLB | |
570 | * Application note (317080) which says, while changing | |
571 | * the page sizes, new and old translations should | |
572 | * not differ with respect to page frame and | |
573 | * attributes. | |
574 | */ | |
3afa3949 | 575 | if (page_size_mask & (1 << PG_LEVEL_1G)) { |
876ee61a JB |
576 | if (!after_bootmem) |
577 | pages++; | |
20167d34 | 578 | last_map_addr = next; |
b27a43c1 | 579 | continue; |
3afa3949 | 580 | } |
b27a43c1 | 581 | prot = pte_pgprot(pte_clrhuge(*(pte_t *)pud)); |
ef925766 AK |
582 | } |
583 | ||
b50efd2a | 584 | if (page_size_mask & (1<<PG_LEVEL_1G)) { |
ce0c0e50 | 585 | pages++; |
8ae3a5a8 | 586 | spin_lock(&init_mm.page_table_lock); |
ef925766 | 587 | set_pte((pte_t *)pud, |
960ddb4f YL |
588 | pfn_pte((addr & PUD_MASK) >> PAGE_SHIFT, |
589 | PAGE_KERNEL_LARGE)); | |
8ae3a5a8 | 590 | spin_unlock(&init_mm.page_table_lock); |
20167d34 | 591 | last_map_addr = next; |
6ad91658 KM |
592 | continue; |
593 | } | |
594 | ||
868bf4d6 | 595 | pmd = alloc_low_page(); |
b27a43c1 SS |
596 | last_map_addr = phys_pmd_init(pmd, addr, end, page_size_mask, |
597 | prot); | |
8ae3a5a8 JB |
598 | |
599 | spin_lock(&init_mm.page_table_lock); | |
868bf4d6 | 600 | pud_populate(&init_mm, pud, pmd); |
44df75e6 | 601 | spin_unlock(&init_mm.page_table_lock); |
1da177e4 | 602 | } |
1a2b4412 | 603 | __flush_tlb_all(); |
a2699e47 | 604 | |
ce0c0e50 | 605 | update_page_count(PG_LEVEL_1G, pages); |
cc615032 | 606 | |
1a0db38e | 607 | return last_map_addr; |
14a62c34 | 608 | } |
1da177e4 | 609 | |
41d840e2 | 610 | unsigned long __meminit |
f765090a PE |
611 | kernel_physical_mapping_init(unsigned long start, |
612 | unsigned long end, | |
613 | unsigned long page_size_mask) | |
14a62c34 | 614 | { |
9b861528 | 615 | bool pgd_changed = false; |
b50efd2a | 616 | unsigned long next, last_map_addr = end; |
9b861528 | 617 | unsigned long addr; |
1da177e4 LT |
618 | |
619 | start = (unsigned long)__va(start); | |
620 | end = (unsigned long)__va(end); | |
1c5f50ee | 621 | addr = start; |
1da177e4 LT |
622 | |
623 | for (; start < end; start = next) { | |
44df75e6 MT |
624 | pgd_t *pgd = pgd_offset_k(start); |
625 | pud_t *pud; | |
626 | ||
c2bdee59 | 627 | next = (start & PGDIR_MASK) + PGDIR_SIZE; |
4f9c11dd JF |
628 | |
629 | if (pgd_val(*pgd)) { | |
973dc4f3 | 630 | pud = (pud_t *)pgd_page_vaddr(*pgd); |
4b239f45 | 631 | last_map_addr = phys_pud_init(pud, __pa(start), |
b50efd2a | 632 | __pa(end), page_size_mask); |
4f9c11dd JF |
633 | continue; |
634 | } | |
635 | ||
868bf4d6 | 636 | pud = alloc_low_page(); |
c2bdee59 | 637 | last_map_addr = phys_pud_init(pud, __pa(start), __pa(end), |
b50efd2a | 638 | page_size_mask); |
8ae3a5a8 JB |
639 | |
640 | spin_lock(&init_mm.page_table_lock); | |
868bf4d6 | 641 | pgd_populate(&init_mm, pgd, pud); |
8ae3a5a8 | 642 | spin_unlock(&init_mm.page_table_lock); |
9b861528 | 643 | pgd_changed = true; |
14a62c34 | 644 | } |
9b861528 HL |
645 | |
646 | if (pgd_changed) | |
9661d5bc | 647 | sync_global_pgds(addr, end - 1, 0); |
9b861528 | 648 | |
a2699e47 | 649 | __flush_tlb_all(); |
1da177e4 | 650 | |
b50efd2a YL |
651 | return last_map_addr; |
652 | } | |
7b16eb89 | 653 | |
2b97690f | 654 | #ifndef CONFIG_NUMA |
d8fc3afc | 655 | void __init initmem_init(void) |
1f75d7e3 | 656 | { |
e7e8de59 | 657 | memblock_set_node(0, (phys_addr_t)ULLONG_MAX, &memblock.memory, 0); |
1f75d7e3 | 658 | } |
3551f88f | 659 | #endif |
1f75d7e3 | 660 | |
1da177e4 LT |
661 | void __init paging_init(void) |
662 | { | |
3551f88f | 663 | sparse_memory_present_with_active_regions(MAX_NUMNODES); |
44df75e6 | 664 | sparse_init(); |
44b57280 YL |
665 | |
666 | /* | |
667 | * clear the default setting with node 0 | |
668 | * note: don't use nodes_clear here, that is really clearing when | |
669 | * numa support is not compiled in, and later node_set_state | |
670 | * will not set it back. | |
671 | */ | |
4b0ef1fe LJ |
672 | node_clear_state(0, N_MEMORY); |
673 | if (N_MEMORY != N_NORMAL_MEMORY) | |
674 | node_clear_state(0, N_NORMAL_MEMORY); | |
44b57280 | 675 | |
4c0b2e5f | 676 | zone_sizes_init(); |
1da177e4 | 677 | } |
1da177e4 | 678 | |
44df75e6 MT |
679 | /* |
680 | * Memory hotplug specific functions | |
44df75e6 | 681 | */ |
bc02af93 | 682 | #ifdef CONFIG_MEMORY_HOTPLUG |
ea085417 SZ |
683 | /* |
684 | * After memory hotplug the variables max_pfn, max_low_pfn and high_memory need | |
685 | * updating. | |
686 | */ | |
687 | static void update_end_of_memory_vars(u64 start, u64 size) | |
688 | { | |
689 | unsigned long end_pfn = PFN_UP(start + size); | |
690 | ||
691 | if (end_pfn > max_pfn) { | |
692 | max_pfn = end_pfn; | |
693 | max_low_pfn = end_pfn; | |
694 | high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1; | |
695 | } | |
696 | } | |
697 | ||
9d99aaa3 AK |
698 | /* |
699 | * Memory is added always to NORMAL zone. This means you will never get | |
700 | * additional DMA/DMA32 memory. | |
701 | */ | |
bc02af93 | 702 | int arch_add_memory(int nid, u64 start, u64 size) |
44df75e6 | 703 | { |
bc02af93 | 704 | struct pglist_data *pgdat = NODE_DATA(nid); |
9bfc4113 WN |
705 | struct zone *zone = pgdat->node_zones + |
706 | zone_for_memory(nid, start, size, ZONE_NORMAL); | |
66520ebc | 707 | unsigned long start_pfn = start >> PAGE_SHIFT; |
44df75e6 MT |
708 | unsigned long nr_pages = size >> PAGE_SHIFT; |
709 | int ret; | |
710 | ||
66520ebc | 711 | init_memory_mapping(start, start + size); |
45e0b78b | 712 | |
c04fc586 | 713 | ret = __add_pages(nid, zone, start_pfn, nr_pages); |
fe8b868e | 714 | WARN_ON_ONCE(ret); |
44df75e6 | 715 | |
ea085417 SZ |
716 | /* update max_pfn, max_low_pfn and high_memory */ |
717 | update_end_of_memory_vars(start, size); | |
718 | ||
44df75e6 | 719 | return ret; |
44df75e6 | 720 | } |
bc02af93 | 721 | EXPORT_SYMBOL_GPL(arch_add_memory); |
44df75e6 | 722 | |
ae9aae9e WC |
723 | #define PAGE_INUSE 0xFD |
724 | ||
725 | static void __meminit free_pagetable(struct page *page, int order) | |
726 | { | |
ae9aae9e WC |
727 | unsigned long magic; |
728 | unsigned int nr_pages = 1 << order; | |
729 | ||
730 | /* bootmem page has reserved flag */ | |
731 | if (PageReserved(page)) { | |
732 | __ClearPageReserved(page); | |
ae9aae9e WC |
733 | |
734 | magic = (unsigned long)page->lru.next; | |
735 | if (magic == SECTION_INFO || magic == MIX_SECTION_INFO) { | |
736 | while (nr_pages--) | |
737 | put_page_bootmem(page++); | |
738 | } else | |
170a5a7e JL |
739 | while (nr_pages--) |
740 | free_reserved_page(page++); | |
ae9aae9e WC |
741 | } else |
742 | free_pages((unsigned long)page_address(page), order); | |
ae9aae9e WC |
743 | } |
744 | ||
745 | static void __meminit free_pte_table(pte_t *pte_start, pmd_t *pmd) | |
746 | { | |
747 | pte_t *pte; | |
748 | int i; | |
749 | ||
750 | for (i = 0; i < PTRS_PER_PTE; i++) { | |
751 | pte = pte_start + i; | |
752 | if (pte_val(*pte)) | |
753 | return; | |
754 | } | |
755 | ||
756 | /* free a pte talbe */ | |
757 | free_pagetable(pmd_page(*pmd), 0); | |
758 | spin_lock(&init_mm.page_table_lock); | |
759 | pmd_clear(pmd); | |
760 | spin_unlock(&init_mm.page_table_lock); | |
761 | } | |
762 | ||
763 | static void __meminit free_pmd_table(pmd_t *pmd_start, pud_t *pud) | |
764 | { | |
765 | pmd_t *pmd; | |
766 | int i; | |
767 | ||
768 | for (i = 0; i < PTRS_PER_PMD; i++) { | |
769 | pmd = pmd_start + i; | |
770 | if (pmd_val(*pmd)) | |
771 | return; | |
772 | } | |
773 | ||
774 | /* free a pmd talbe */ | |
775 | free_pagetable(pud_page(*pud), 0); | |
776 | spin_lock(&init_mm.page_table_lock); | |
777 | pud_clear(pud); | |
778 | spin_unlock(&init_mm.page_table_lock); | |
779 | } | |
780 | ||
781 | /* Return true if pgd is changed, otherwise return false. */ | |
782 | static bool __meminit free_pud_table(pud_t *pud_start, pgd_t *pgd) | |
783 | { | |
784 | pud_t *pud; | |
785 | int i; | |
786 | ||
787 | for (i = 0; i < PTRS_PER_PUD; i++) { | |
788 | pud = pud_start + i; | |
789 | if (pud_val(*pud)) | |
790 | return false; | |
791 | } | |
792 | ||
793 | /* free a pud table */ | |
794 | free_pagetable(pgd_page(*pgd), 0); | |
795 | spin_lock(&init_mm.page_table_lock); | |
796 | pgd_clear(pgd); | |
797 | spin_unlock(&init_mm.page_table_lock); | |
798 | ||
799 | return true; | |
800 | } | |
801 | ||
802 | static void __meminit | |
803 | remove_pte_table(pte_t *pte_start, unsigned long addr, unsigned long end, | |
804 | bool direct) | |
805 | { | |
806 | unsigned long next, pages = 0; | |
807 | pte_t *pte; | |
808 | void *page_addr; | |
809 | phys_addr_t phys_addr; | |
810 | ||
811 | pte = pte_start + pte_index(addr); | |
812 | for (; addr < end; addr = next, pte++) { | |
813 | next = (addr + PAGE_SIZE) & PAGE_MASK; | |
814 | if (next > end) | |
815 | next = end; | |
816 | ||
817 | if (!pte_present(*pte)) | |
818 | continue; | |
819 | ||
820 | /* | |
821 | * We mapped [0,1G) memory as identity mapping when | |
822 | * initializing, in arch/x86/kernel/head_64.S. These | |
823 | * pagetables cannot be removed. | |
824 | */ | |
825 | phys_addr = pte_val(*pte) + (addr & PAGE_MASK); | |
826 | if (phys_addr < (phys_addr_t)0x40000000) | |
827 | return; | |
828 | ||
829 | if (IS_ALIGNED(addr, PAGE_SIZE) && | |
830 | IS_ALIGNED(next, PAGE_SIZE)) { | |
831 | /* | |
832 | * Do not free direct mapping pages since they were | |
833 | * freed when offlining, or simplely not in use. | |
834 | */ | |
835 | if (!direct) | |
836 | free_pagetable(pte_page(*pte), 0); | |
837 | ||
838 | spin_lock(&init_mm.page_table_lock); | |
839 | pte_clear(&init_mm, addr, pte); | |
840 | spin_unlock(&init_mm.page_table_lock); | |
841 | ||
842 | /* For non-direct mapping, pages means nothing. */ | |
843 | pages++; | |
844 | } else { | |
845 | /* | |
846 | * If we are here, we are freeing vmemmap pages since | |
847 | * direct mapped memory ranges to be freed are aligned. | |
848 | * | |
849 | * If we are not removing the whole page, it means | |
850 | * other page structs in this page are being used and | |
851 | * we canot remove them. So fill the unused page_structs | |
852 | * with 0xFD, and remove the page when it is wholly | |
853 | * filled with 0xFD. | |
854 | */ | |
855 | memset((void *)addr, PAGE_INUSE, next - addr); | |
856 | ||
857 | page_addr = page_address(pte_page(*pte)); | |
858 | if (!memchr_inv(page_addr, PAGE_INUSE, PAGE_SIZE)) { | |
859 | free_pagetable(pte_page(*pte), 0); | |
860 | ||
861 | spin_lock(&init_mm.page_table_lock); | |
862 | pte_clear(&init_mm, addr, pte); | |
863 | spin_unlock(&init_mm.page_table_lock); | |
864 | } | |
865 | } | |
866 | } | |
867 | ||
868 | /* Call free_pte_table() in remove_pmd_table(). */ | |
869 | flush_tlb_all(); | |
870 | if (direct) | |
871 | update_page_count(PG_LEVEL_4K, -pages); | |
872 | } | |
873 | ||
874 | static void __meminit | |
875 | remove_pmd_table(pmd_t *pmd_start, unsigned long addr, unsigned long end, | |
876 | bool direct) | |
877 | { | |
878 | unsigned long next, pages = 0; | |
879 | pte_t *pte_base; | |
880 | pmd_t *pmd; | |
881 | void *page_addr; | |
882 | ||
883 | pmd = pmd_start + pmd_index(addr); | |
884 | for (; addr < end; addr = next, pmd++) { | |
885 | next = pmd_addr_end(addr, end); | |
886 | ||
887 | if (!pmd_present(*pmd)) | |
888 | continue; | |
889 | ||
890 | if (pmd_large(*pmd)) { | |
891 | if (IS_ALIGNED(addr, PMD_SIZE) && | |
892 | IS_ALIGNED(next, PMD_SIZE)) { | |
893 | if (!direct) | |
894 | free_pagetable(pmd_page(*pmd), | |
895 | get_order(PMD_SIZE)); | |
896 | ||
897 | spin_lock(&init_mm.page_table_lock); | |
898 | pmd_clear(pmd); | |
899 | spin_unlock(&init_mm.page_table_lock); | |
900 | pages++; | |
901 | } else { | |
902 | /* If here, we are freeing vmemmap pages. */ | |
903 | memset((void *)addr, PAGE_INUSE, next - addr); | |
904 | ||
905 | page_addr = page_address(pmd_page(*pmd)); | |
906 | if (!memchr_inv(page_addr, PAGE_INUSE, | |
907 | PMD_SIZE)) { | |
908 | free_pagetable(pmd_page(*pmd), | |
909 | get_order(PMD_SIZE)); | |
910 | ||
911 | spin_lock(&init_mm.page_table_lock); | |
912 | pmd_clear(pmd); | |
913 | spin_unlock(&init_mm.page_table_lock); | |
914 | } | |
915 | } | |
916 | ||
917 | continue; | |
918 | } | |
919 | ||
920 | pte_base = (pte_t *)pmd_page_vaddr(*pmd); | |
921 | remove_pte_table(pte_base, addr, next, direct); | |
922 | free_pte_table(pte_base, pmd); | |
923 | } | |
924 | ||
925 | /* Call free_pmd_table() in remove_pud_table(). */ | |
926 | if (direct) | |
927 | update_page_count(PG_LEVEL_2M, -pages); | |
928 | } | |
929 | ||
930 | static void __meminit | |
931 | remove_pud_table(pud_t *pud_start, unsigned long addr, unsigned long end, | |
932 | bool direct) | |
933 | { | |
934 | unsigned long next, pages = 0; | |
935 | pmd_t *pmd_base; | |
936 | pud_t *pud; | |
937 | void *page_addr; | |
938 | ||
939 | pud = pud_start + pud_index(addr); | |
940 | for (; addr < end; addr = next, pud++) { | |
941 | next = pud_addr_end(addr, end); | |
942 | ||
943 | if (!pud_present(*pud)) | |
944 | continue; | |
945 | ||
946 | if (pud_large(*pud)) { | |
947 | if (IS_ALIGNED(addr, PUD_SIZE) && | |
948 | IS_ALIGNED(next, PUD_SIZE)) { | |
949 | if (!direct) | |
950 | free_pagetable(pud_page(*pud), | |
951 | get_order(PUD_SIZE)); | |
952 | ||
953 | spin_lock(&init_mm.page_table_lock); | |
954 | pud_clear(pud); | |
955 | spin_unlock(&init_mm.page_table_lock); | |
956 | pages++; | |
957 | } else { | |
958 | /* If here, we are freeing vmemmap pages. */ | |
959 | memset((void *)addr, PAGE_INUSE, next - addr); | |
960 | ||
961 | page_addr = page_address(pud_page(*pud)); | |
962 | if (!memchr_inv(page_addr, PAGE_INUSE, | |
963 | PUD_SIZE)) { | |
964 | free_pagetable(pud_page(*pud), | |
965 | get_order(PUD_SIZE)); | |
966 | ||
967 | spin_lock(&init_mm.page_table_lock); | |
968 | pud_clear(pud); | |
969 | spin_unlock(&init_mm.page_table_lock); | |
970 | } | |
971 | } | |
972 | ||
973 | continue; | |
974 | } | |
975 | ||
976 | pmd_base = (pmd_t *)pud_page_vaddr(*pud); | |
977 | remove_pmd_table(pmd_base, addr, next, direct); | |
978 | free_pmd_table(pmd_base, pud); | |
979 | } | |
980 | ||
981 | if (direct) | |
982 | update_page_count(PG_LEVEL_1G, -pages); | |
983 | } | |
984 | ||
985 | /* start and end are both virtual address. */ | |
986 | static void __meminit | |
987 | remove_pagetable(unsigned long start, unsigned long end, bool direct) | |
988 | { | |
989 | unsigned long next; | |
5255e0a7 | 990 | unsigned long addr; |
ae9aae9e WC |
991 | pgd_t *pgd; |
992 | pud_t *pud; | |
993 | bool pgd_changed = false; | |
994 | ||
5255e0a7 YI |
995 | for (addr = start; addr < end; addr = next) { |
996 | next = pgd_addr_end(addr, end); | |
ae9aae9e | 997 | |
5255e0a7 | 998 | pgd = pgd_offset_k(addr); |
ae9aae9e WC |
999 | if (!pgd_present(*pgd)) |
1000 | continue; | |
1001 | ||
1002 | pud = (pud_t *)pgd_page_vaddr(*pgd); | |
5255e0a7 | 1003 | remove_pud_table(pud, addr, next, direct); |
ae9aae9e WC |
1004 | if (free_pud_table(pud, pgd)) |
1005 | pgd_changed = true; | |
1006 | } | |
1007 | ||
1008 | if (pgd_changed) | |
9661d5bc | 1009 | sync_global_pgds(start, end - 1, 1); |
ae9aae9e WC |
1010 | |
1011 | flush_tlb_all(); | |
1012 | } | |
1013 | ||
0aad818b | 1014 | void __ref vmemmap_free(unsigned long start, unsigned long end) |
0197518c | 1015 | { |
0197518c TC |
1016 | remove_pagetable(start, end, false); |
1017 | } | |
1018 | ||
587ff8c4 | 1019 | #ifdef CONFIG_MEMORY_HOTREMOVE |
bbcab878 TC |
1020 | static void __meminit |
1021 | kernel_physical_mapping_remove(unsigned long start, unsigned long end) | |
1022 | { | |
1023 | start = (unsigned long)__va(start); | |
1024 | end = (unsigned long)__va(end); | |
1025 | ||
1026 | remove_pagetable(start, end, true); | |
1027 | } | |
1028 | ||
24d335ca WC |
1029 | int __ref arch_remove_memory(u64 start, u64 size) |
1030 | { | |
1031 | unsigned long start_pfn = start >> PAGE_SHIFT; | |
1032 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
1033 | struct zone *zone; | |
1034 | int ret; | |
1035 | ||
1036 | zone = page_zone(pfn_to_page(start_pfn)); | |
bbcab878 | 1037 | kernel_physical_mapping_remove(start, start + size); |
24d335ca WC |
1038 | ret = __remove_pages(zone, start_pfn, nr_pages); |
1039 | WARN_ON_ONCE(ret); | |
1040 | ||
1041 | return ret; | |
1042 | } | |
1043 | #endif | |
45e0b78b KM |
1044 | #endif /* CONFIG_MEMORY_HOTPLUG */ |
1045 | ||
81ac3ad9 | 1046 | static struct kcore_list kcore_vsyscall; |
1da177e4 | 1047 | |
94b43c3d YL |
1048 | static void __init register_page_bootmem_info(void) |
1049 | { | |
1050 | #ifdef CONFIG_NUMA | |
1051 | int i; | |
1052 | ||
1053 | for_each_online_node(i) | |
1054 | register_page_bootmem_info_node(NODE_DATA(i)); | |
1055 | #endif | |
1056 | } | |
1057 | ||
1da177e4 LT |
1058 | void __init mem_init(void) |
1059 | { | |
0dc243ae | 1060 | pci_iommu_alloc(); |
1da177e4 | 1061 | |
48ddb154 | 1062 | /* clear_bss() already clear the empty_zero_page */ |
1da177e4 | 1063 | |
94b43c3d | 1064 | register_page_bootmem_info(); |
bced0e32 JL |
1065 | |
1066 | /* this will put all memory onto the freelists */ | |
0c988534 | 1067 | free_all_bootmem(); |
1da177e4 LT |
1068 | after_bootmem = 1; |
1069 | ||
1da177e4 | 1070 | /* Register memory areas for /proc/kcore */ |
f40c3300 AL |
1071 | kclist_add(&kcore_vsyscall, (void *)VSYSCALL_ADDR, |
1072 | PAGE_SIZE, KCORE_OTHER); | |
1da177e4 | 1073 | |
46a84132 | 1074 | mem_init_print_info(NULL); |
1da177e4 LT |
1075 | } |
1076 | ||
67df197b | 1077 | #ifdef CONFIG_DEBUG_RODATA |
edeed305 AV |
1078 | const int rodata_test_data = 0xC3; |
1079 | EXPORT_SYMBOL_GPL(rodata_test_data); | |
67df197b | 1080 | |
502f6604 | 1081 | int kernel_set_to_readonly; |
16239630 SR |
1082 | |
1083 | void set_kernel_text_rw(void) | |
1084 | { | |
b9af7c0d | 1085 | unsigned long start = PFN_ALIGN(_text); |
e7d23dde | 1086 | unsigned long end = PFN_ALIGN(__stop___ex_table); |
16239630 SR |
1087 | |
1088 | if (!kernel_set_to_readonly) | |
1089 | return; | |
1090 | ||
1091 | pr_debug("Set kernel text: %lx - %lx for read write\n", | |
1092 | start, end); | |
1093 | ||
e7d23dde SS |
1094 | /* |
1095 | * Make the kernel identity mapping for text RW. Kernel text | |
1096 | * mapping will always be RO. Refer to the comment in | |
1097 | * static_protections() in pageattr.c | |
1098 | */ | |
16239630 SR |
1099 | set_memory_rw(start, (end - start) >> PAGE_SHIFT); |
1100 | } | |
1101 | ||
1102 | void set_kernel_text_ro(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 only\n", | |
1111 | start, end); | |
1112 | ||
e7d23dde SS |
1113 | /* |
1114 | * Set the kernel identity mapping for text RO. | |
1115 | */ | |
16239630 SR |
1116 | set_memory_ro(start, (end - start) >> PAGE_SHIFT); |
1117 | } | |
1118 | ||
67df197b AV |
1119 | void mark_rodata_ro(void) |
1120 | { | |
74e08179 | 1121 | unsigned long start = PFN_ALIGN(_text); |
fc8d7826 | 1122 | unsigned long rodata_start = PFN_ALIGN(__start_rodata); |
74e08179 | 1123 | unsigned long end = (unsigned long) &__end_rodata_hpage_align; |
fc8d7826 AD |
1124 | unsigned long text_end = PFN_ALIGN(&__stop___ex_table); |
1125 | unsigned long rodata_end = PFN_ALIGN(&__end_rodata); | |
72212675 | 1126 | unsigned long all_end = PFN_ALIGN(&_end); |
8f0f996e | 1127 | |
6fb14755 | 1128 | printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n", |
e3ebadd9 | 1129 | (end - start) >> 10); |
984bb80d AV |
1130 | set_memory_ro(start, (end - start) >> PAGE_SHIFT); |
1131 | ||
16239630 SR |
1132 | kernel_set_to_readonly = 1; |
1133 | ||
984bb80d | 1134 | /* |
72212675 YL |
1135 | * The rodata/data/bss/brk section (but not the kernel text!) |
1136 | * should also be not-executable. | |
984bb80d | 1137 | */ |
72212675 | 1138 | set_memory_nx(rodata_start, (all_end - rodata_start) >> PAGE_SHIFT); |
67df197b | 1139 | |
1a487252 AV |
1140 | rodata_test(); |
1141 | ||
0c42f392 | 1142 | #ifdef CONFIG_CPA_DEBUG |
10f22dde | 1143 | printk(KERN_INFO "Testing CPA: undo %lx-%lx\n", start, end); |
6d238cc4 | 1144 | set_memory_rw(start, (end-start) >> PAGE_SHIFT); |
0c42f392 | 1145 | |
10f22dde | 1146 | printk(KERN_INFO "Testing CPA: again\n"); |
6d238cc4 | 1147 | set_memory_ro(start, (end-start) >> PAGE_SHIFT); |
0c42f392 | 1148 | #endif |
74e08179 | 1149 | |
c88442ec | 1150 | free_init_pages("unused kernel", |
fc8d7826 AD |
1151 | (unsigned long) __va(__pa_symbol(text_end)), |
1152 | (unsigned long) __va(__pa_symbol(rodata_start))); | |
c88442ec | 1153 | free_init_pages("unused kernel", |
fc8d7826 AD |
1154 | (unsigned long) __va(__pa_symbol(rodata_end)), |
1155 | (unsigned long) __va(__pa_symbol(_sdata))); | |
67df197b | 1156 | } |
4e4eee0e | 1157 | |
67df197b AV |
1158 | #endif |
1159 | ||
14a62c34 TG |
1160 | int kern_addr_valid(unsigned long addr) |
1161 | { | |
1da177e4 | 1162 | unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT; |
14a62c34 TG |
1163 | pgd_t *pgd; |
1164 | pud_t *pud; | |
1165 | pmd_t *pmd; | |
1166 | pte_t *pte; | |
1da177e4 LT |
1167 | |
1168 | if (above != 0 && above != -1UL) | |
14a62c34 TG |
1169 | return 0; |
1170 | ||
1da177e4 LT |
1171 | pgd = pgd_offset_k(addr); |
1172 | if (pgd_none(*pgd)) | |
1173 | return 0; | |
1174 | ||
1175 | pud = pud_offset(pgd, addr); | |
1176 | if (pud_none(*pud)) | |
14a62c34 | 1177 | return 0; |
1da177e4 | 1178 | |
0ee364eb MG |
1179 | if (pud_large(*pud)) |
1180 | return pfn_valid(pud_pfn(*pud)); | |
1181 | ||
1da177e4 LT |
1182 | pmd = pmd_offset(pud, addr); |
1183 | if (pmd_none(*pmd)) | |
1184 | return 0; | |
14a62c34 | 1185 | |
1da177e4 LT |
1186 | if (pmd_large(*pmd)) |
1187 | return pfn_valid(pmd_pfn(*pmd)); | |
1188 | ||
1189 | pte = pte_offset_kernel(pmd, addr); | |
1190 | if (pte_none(*pte)) | |
1191 | return 0; | |
14a62c34 | 1192 | |
1da177e4 LT |
1193 | return pfn_valid(pte_pfn(*pte)); |
1194 | } | |
1195 | ||
14a62c34 TG |
1196 | /* |
1197 | * A pseudo VMA to allow ptrace access for the vsyscall page. This only | |
1198 | * covers the 64bit vsyscall page now. 32bit has a real VMA now and does | |
1199 | * not need special handling anymore: | |
1200 | */ | |
ac49b9a9 AL |
1201 | static const char *gate_vma_name(struct vm_area_struct *vma) |
1202 | { | |
1203 | return "[vsyscall]"; | |
1204 | } | |
1205 | static struct vm_operations_struct gate_vma_ops = { | |
1206 | .name = gate_vma_name, | |
1207 | }; | |
1da177e4 | 1208 | static struct vm_area_struct gate_vma = { |
f40c3300 AL |
1209 | .vm_start = VSYSCALL_ADDR, |
1210 | .vm_end = VSYSCALL_ADDR + PAGE_SIZE, | |
14a62c34 | 1211 | .vm_page_prot = PAGE_READONLY_EXEC, |
ac49b9a9 AL |
1212 | .vm_flags = VM_READ | VM_EXEC, |
1213 | .vm_ops = &gate_vma_ops, | |
1da177e4 LT |
1214 | }; |
1215 | ||
31db58b3 | 1216 | struct vm_area_struct *get_gate_vma(struct mm_struct *mm) |
1da177e4 LT |
1217 | { |
1218 | #ifdef CONFIG_IA32_EMULATION | |
31db58b3 | 1219 | if (!mm || mm->context.ia32_compat) |
1e014410 | 1220 | return NULL; |
1da177e4 LT |
1221 | #endif |
1222 | return &gate_vma; | |
1223 | } | |
1224 | ||
83b964bb | 1225 | int in_gate_area(struct mm_struct *mm, unsigned long addr) |
1da177e4 | 1226 | { |
83b964bb | 1227 | struct vm_area_struct *vma = get_gate_vma(mm); |
14a62c34 | 1228 | |
1e014410 AK |
1229 | if (!vma) |
1230 | return 0; | |
14a62c34 | 1231 | |
1da177e4 LT |
1232 | return (addr >= vma->vm_start) && (addr < vma->vm_end); |
1233 | } | |
1234 | ||
14a62c34 | 1235 | /* |
cae5d390 SW |
1236 | * Use this when you have no reliable mm, typically from interrupt |
1237 | * context. It is less reliable than using a task's mm and may give | |
1238 | * false positives. | |
1da177e4 | 1239 | */ |
cae5d390 | 1240 | int in_gate_area_no_mm(unsigned long addr) |
1da177e4 | 1241 | { |
f40c3300 | 1242 | return (addr & PAGE_MASK) == VSYSCALL_ADDR; |
2aae950b | 1243 | } |
0889eba5 | 1244 | |
982792c7 | 1245 | static unsigned long probe_memory_block_size(void) |
1dc41aa6 | 1246 | { |
982792c7 YL |
1247 | /* start from 2g */ |
1248 | unsigned long bz = 1UL<<31; | |
1249 | ||
1250 | #ifdef CONFIG_X86_UV | |
1dc41aa6 NF |
1251 | if (is_uv_system()) { |
1252 | printk(KERN_INFO "UV: memory block size 2GB\n"); | |
1253 | return 2UL * 1024 * 1024 * 1024; | |
1254 | } | |
1dc41aa6 NF |
1255 | #endif |
1256 | ||
982792c7 YL |
1257 | /* less than 64g installed */ |
1258 | if ((max_pfn << PAGE_SHIFT) < (16UL << 32)) | |
1259 | return MIN_MEMORY_BLOCK_SIZE; | |
1260 | ||
1261 | /* get the tail size */ | |
1262 | while (bz > MIN_MEMORY_BLOCK_SIZE) { | |
1263 | if (!((max_pfn << PAGE_SHIFT) & (bz - 1))) | |
1264 | break; | |
1265 | bz >>= 1; | |
1266 | } | |
1267 | ||
1268 | printk(KERN_DEBUG "memory block size : %ldMB\n", bz >> 20); | |
1269 | ||
1270 | return bz; | |
1271 | } | |
1272 | ||
1273 | static unsigned long memory_block_size_probed; | |
1274 | unsigned long memory_block_size_bytes(void) | |
1275 | { | |
1276 | if (!memory_block_size_probed) | |
1277 | memory_block_size_probed = probe_memory_block_size(); | |
1278 | ||
1279 | return memory_block_size_probed; | |
1280 | } | |
1281 | ||
0889eba5 CL |
1282 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
1283 | /* | |
1284 | * Initialise the sparsemem vmemmap using huge-pages at the PMD level. | |
1285 | */ | |
c2b91e2e YL |
1286 | static long __meminitdata addr_start, addr_end; |
1287 | static void __meminitdata *p_start, *p_end; | |
1288 | static int __meminitdata node_start; | |
1289 | ||
e8216da5 JW |
1290 | static int __meminit vmemmap_populate_hugepages(unsigned long start, |
1291 | unsigned long end, int node) | |
0889eba5 | 1292 | { |
0aad818b | 1293 | unsigned long addr; |
0889eba5 CL |
1294 | unsigned long next; |
1295 | pgd_t *pgd; | |
1296 | pud_t *pud; | |
1297 | pmd_t *pmd; | |
1298 | ||
0aad818b | 1299 | for (addr = start; addr < end; addr = next) { |
e8216da5 | 1300 | next = pmd_addr_end(addr, end); |
0889eba5 CL |
1301 | |
1302 | pgd = vmemmap_pgd_populate(addr, node); | |
1303 | if (!pgd) | |
1304 | return -ENOMEM; | |
14a62c34 | 1305 | |
0889eba5 CL |
1306 | pud = vmemmap_pud_populate(pgd, addr, node); |
1307 | if (!pud) | |
1308 | return -ENOMEM; | |
1309 | ||
e8216da5 JW |
1310 | pmd = pmd_offset(pud, addr); |
1311 | if (pmd_none(*pmd)) { | |
e8216da5 | 1312 | void *p; |
14a62c34 | 1313 | |
e8216da5 | 1314 | p = vmemmap_alloc_block_buf(PMD_SIZE, node); |
8e2cdbcb JW |
1315 | if (p) { |
1316 | pte_t entry; | |
1317 | ||
1318 | entry = pfn_pte(__pa(p) >> PAGE_SHIFT, | |
1319 | PAGE_KERNEL_LARGE); | |
1320 | set_pmd(pmd, __pmd(pte_val(entry))); | |
1321 | ||
1322 | /* check to see if we have contiguous blocks */ | |
1323 | if (p_end != p || node_start != node) { | |
1324 | if (p_start) | |
1325 | printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n", | |
1326 | addr_start, addr_end-1, p_start, p_end-1, node_start); | |
1327 | addr_start = addr; | |
1328 | node_start = node; | |
1329 | p_start = p; | |
1330 | } | |
7c934d39 | 1331 | |
8e2cdbcb JW |
1332 | addr_end = addr + PMD_SIZE; |
1333 | p_end = p + PMD_SIZE; | |
1334 | continue; | |
1335 | } | |
1336 | } else if (pmd_large(*pmd)) { | |
e8216da5 | 1337 | vmemmap_verify((pte_t *)pmd, node, addr, next); |
8e2cdbcb JW |
1338 | continue; |
1339 | } | |
1340 | pr_warn_once("vmemmap: falling back to regular page backing\n"); | |
1341 | if (vmemmap_populate_basepages(addr, next, node)) | |
1342 | return -ENOMEM; | |
0889eba5 | 1343 | } |
0889eba5 CL |
1344 | return 0; |
1345 | } | |
c2b91e2e | 1346 | |
e8216da5 JW |
1347 | int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node) |
1348 | { | |
1349 | int err; | |
1350 | ||
1351 | if (cpu_has_pse) | |
1352 | err = vmemmap_populate_hugepages(start, end, node); | |
1353 | else | |
1354 | err = vmemmap_populate_basepages(start, end, node); | |
1355 | if (!err) | |
9661d5bc | 1356 | sync_global_pgds(start, end - 1, 0); |
e8216da5 JW |
1357 | return err; |
1358 | } | |
1359 | ||
46723bfa YI |
1360 | #if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HAVE_BOOTMEM_INFO_NODE) |
1361 | void register_page_bootmem_memmap(unsigned long section_nr, | |
1362 | struct page *start_page, unsigned long size) | |
1363 | { | |
1364 | unsigned long addr = (unsigned long)start_page; | |
1365 | unsigned long end = (unsigned long)(start_page + size); | |
1366 | unsigned long next; | |
1367 | pgd_t *pgd; | |
1368 | pud_t *pud; | |
1369 | pmd_t *pmd; | |
1370 | unsigned int nr_pages; | |
1371 | struct page *page; | |
1372 | ||
1373 | for (; addr < end; addr = next) { | |
1374 | pte_t *pte = NULL; | |
1375 | ||
1376 | pgd = pgd_offset_k(addr); | |
1377 | if (pgd_none(*pgd)) { | |
1378 | next = (addr + PAGE_SIZE) & PAGE_MASK; | |
1379 | continue; | |
1380 | } | |
1381 | get_page_bootmem(section_nr, pgd_page(*pgd), MIX_SECTION_INFO); | |
1382 | ||
1383 | pud = pud_offset(pgd, addr); | |
1384 | if (pud_none(*pud)) { | |
1385 | next = (addr + PAGE_SIZE) & PAGE_MASK; | |
1386 | continue; | |
1387 | } | |
1388 | get_page_bootmem(section_nr, pud_page(*pud), MIX_SECTION_INFO); | |
1389 | ||
1390 | if (!cpu_has_pse) { | |
1391 | next = (addr + PAGE_SIZE) & PAGE_MASK; | |
1392 | pmd = pmd_offset(pud, addr); | |
1393 | if (pmd_none(*pmd)) | |
1394 | continue; | |
1395 | get_page_bootmem(section_nr, pmd_page(*pmd), | |
1396 | MIX_SECTION_INFO); | |
1397 | ||
1398 | pte = pte_offset_kernel(pmd, addr); | |
1399 | if (pte_none(*pte)) | |
1400 | continue; | |
1401 | get_page_bootmem(section_nr, pte_page(*pte), | |
1402 | SECTION_INFO); | |
1403 | } else { | |
1404 | next = pmd_addr_end(addr, end); | |
1405 | ||
1406 | pmd = pmd_offset(pud, addr); | |
1407 | if (pmd_none(*pmd)) | |
1408 | continue; | |
1409 | ||
1410 | nr_pages = 1 << (get_order(PMD_SIZE)); | |
1411 | page = pmd_page(*pmd); | |
1412 | while (nr_pages--) | |
1413 | get_page_bootmem(section_nr, page++, | |
1414 | SECTION_INFO); | |
1415 | } | |
1416 | } | |
1417 | } | |
1418 | #endif | |
1419 | ||
c2b91e2e YL |
1420 | void __meminit vmemmap_populate_print_last(void) |
1421 | { | |
1422 | if (p_start) { | |
1423 | printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n", | |
1424 | addr_start, addr_end-1, p_start, p_end-1, node_start); | |
1425 | p_start = NULL; | |
1426 | p_end = NULL; | |
1427 | node_start = 0; | |
1428 | } | |
1429 | } | |
0889eba5 | 1430 | #endif |