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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/arch/x86_64/mm/init.c | |
3 | * | |
4 | * Copyright (C) 1995 Linus Torvalds | |
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> |
e5f15b45 | 55 | #include <asm/setup.h> |
1da177e4 | 56 | |
5c51bdbe YL |
57 | #include "mm_internal.h" |
58 | ||
aece2785 YL |
59 | static void ident_pmd_init(unsigned long pmd_flag, pmd_t *pmd_page, |
60 | unsigned long addr, unsigned long end) | |
61 | { | |
62 | addr &= PMD_MASK; | |
63 | for (; addr < end; addr += PMD_SIZE) { | |
64 | pmd_t *pmd = pmd_page + pmd_index(addr); | |
65 | ||
66 | if (!pmd_present(*pmd)) | |
67 | set_pmd(pmd, __pmd(addr | pmd_flag)); | |
68 | } | |
69 | } | |
70 | static int ident_pud_init(struct x86_mapping_info *info, pud_t *pud_page, | |
71 | unsigned long addr, unsigned long end) | |
72 | { | |
73 | unsigned long next; | |
74 | ||
75 | for (; addr < end; addr = next) { | |
76 | pud_t *pud = pud_page + pud_index(addr); | |
77 | pmd_t *pmd; | |
78 | ||
79 | next = (addr & PUD_MASK) + PUD_SIZE; | |
80 | if (next > end) | |
81 | next = end; | |
82 | ||
83 | if (pud_present(*pud)) { | |
84 | pmd = pmd_offset(pud, 0); | |
85 | ident_pmd_init(info->pmd_flag, pmd, addr, next); | |
86 | continue; | |
87 | } | |
88 | pmd = (pmd_t *)info->alloc_pgt_page(info->context); | |
89 | if (!pmd) | |
90 | return -ENOMEM; | |
91 | ident_pmd_init(info->pmd_flag, pmd, addr, next); | |
92 | set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE)); | |
93 | } | |
94 | ||
95 | return 0; | |
96 | } | |
97 | ||
98 | int kernel_ident_mapping_init(struct x86_mapping_info *info, pgd_t *pgd_page, | |
99 | unsigned long addr, unsigned long end) | |
100 | { | |
101 | unsigned long next; | |
102 | int result; | |
103 | int off = info->kernel_mapping ? pgd_index(__PAGE_OFFSET) : 0; | |
104 | ||
105 | for (; addr < end; addr = next) { | |
106 | pgd_t *pgd = pgd_page + pgd_index(addr) + off; | |
107 | pud_t *pud; | |
108 | ||
109 | next = (addr & PGDIR_MASK) + PGDIR_SIZE; | |
110 | if (next > end) | |
111 | next = end; | |
112 | ||
113 | if (pgd_present(*pgd)) { | |
114 | pud = pud_offset(pgd, 0); | |
115 | result = ident_pud_init(info, pud, addr, next); | |
116 | if (result) | |
117 | return result; | |
118 | continue; | |
119 | } | |
120 | ||
121 | pud = (pud_t *)info->alloc_pgt_page(info->context); | |
122 | if (!pud) | |
123 | return -ENOMEM; | |
124 | result = ident_pud_init(info, pud, addr, next); | |
125 | if (result) | |
126 | return result; | |
127 | set_pgd(pgd, __pgd(__pa(pud) | _KERNPG_TABLE)); | |
128 | } | |
129 | ||
130 | return 0; | |
131 | } | |
132 | ||
1da177e4 LT |
133 | /* |
134 | * NOTE: pagetable_init alloc all the fixmap pagetables contiguous on the | |
135 | * physical space so we can cache the place of the first one and move | |
136 | * around without checking the pgd every time. | |
137 | */ | |
138 | ||
f955371c | 139 | pteval_t __supported_pte_mask __read_mostly = ~0; |
bd220a24 YL |
140 | EXPORT_SYMBOL_GPL(__supported_pte_mask); |
141 | ||
bd220a24 YL |
142 | int force_personality32; |
143 | ||
deed05b7 IM |
144 | /* |
145 | * noexec32=on|off | |
146 | * Control non executable heap for 32bit processes. | |
147 | * To control the stack too use noexec=off | |
148 | * | |
149 | * on PROT_READ does not imply PROT_EXEC for 32-bit processes (default) | |
150 | * off PROT_READ implies PROT_EXEC | |
151 | */ | |
bd220a24 YL |
152 | static int __init nonx32_setup(char *str) |
153 | { | |
154 | if (!strcmp(str, "on")) | |
155 | force_personality32 &= ~READ_IMPLIES_EXEC; | |
156 | else if (!strcmp(str, "off")) | |
157 | force_personality32 |= READ_IMPLIES_EXEC; | |
158 | return 1; | |
159 | } | |
160 | __setup("noexec32=", nonx32_setup); | |
161 | ||
6afb5157 HL |
162 | /* |
163 | * When memory was added/removed make sure all the processes MM have | |
164 | * suitable PGD entries in the local PGD level page. | |
165 | */ | |
9661d5bc | 166 | void sync_global_pgds(unsigned long start, unsigned long end, int removed) |
6afb5157 | 167 | { |
44235dcd JF |
168 | unsigned long address; |
169 | ||
170 | for (address = start; address <= end; address += PGDIR_SIZE) { | |
171 | const pgd_t *pgd_ref = pgd_offset_k(address); | |
44235dcd JF |
172 | struct page *page; |
173 | ||
9661d5bc YI |
174 | /* |
175 | * When it is called after memory hot remove, pgd_none() | |
176 | * returns true. In this case (removed == 1), we must clear | |
177 | * the PGD entries in the local PGD level page. | |
178 | */ | |
179 | if (pgd_none(*pgd_ref) && !removed) | |
44235dcd JF |
180 | continue; |
181 | ||
a79e53d8 | 182 | spin_lock(&pgd_lock); |
44235dcd | 183 | list_for_each_entry(page, &pgd_list, lru) { |
be354f40 | 184 | pgd_t *pgd; |
617d34d9 JF |
185 | spinlock_t *pgt_lock; |
186 | ||
44235dcd | 187 | pgd = (pgd_t *)page_address(page) + pgd_index(address); |
a79e53d8 | 188 | /* the pgt_lock only for Xen */ |
617d34d9 JF |
189 | pgt_lock = &pgd_page_get_mm(page)->page_table_lock; |
190 | spin_lock(pgt_lock); | |
191 | ||
9661d5bc | 192 | if (!pgd_none(*pgd_ref) && !pgd_none(*pgd)) |
44235dcd JF |
193 | BUG_ON(pgd_page_vaddr(*pgd) |
194 | != pgd_page_vaddr(*pgd_ref)); | |
617d34d9 | 195 | |
9661d5bc YI |
196 | if (removed) { |
197 | if (pgd_none(*pgd_ref) && !pgd_none(*pgd)) | |
198 | pgd_clear(pgd); | |
199 | } else { | |
200 | if (pgd_none(*pgd)) | |
201 | set_pgd(pgd, *pgd_ref); | |
202 | } | |
203 | ||
617d34d9 | 204 | spin_unlock(pgt_lock); |
44235dcd | 205 | } |
a79e53d8 | 206 | spin_unlock(&pgd_lock); |
44235dcd | 207 | } |
6afb5157 HL |
208 | } |
209 | ||
8d6ea967 MS |
210 | /* |
211 | * NOTE: This function is marked __ref because it calls __init function | |
212 | * (alloc_bootmem_pages). It's safe to do it ONLY when after_bootmem == 0. | |
213 | */ | |
214 | static __ref void *spp_getpage(void) | |
14a62c34 | 215 | { |
1da177e4 | 216 | void *ptr; |
14a62c34 | 217 | |
1da177e4 | 218 | if (after_bootmem) |
9e730237 | 219 | ptr = (void *) get_zeroed_page(GFP_ATOMIC | __GFP_NOTRACK); |
1da177e4 LT |
220 | else |
221 | ptr = alloc_bootmem_pages(PAGE_SIZE); | |
14a62c34 TG |
222 | |
223 | if (!ptr || ((unsigned long)ptr & ~PAGE_MASK)) { | |
224 | panic("set_pte_phys: cannot allocate page data %s\n", | |
225 | after_bootmem ? "after bootmem" : ""); | |
226 | } | |
1da177e4 | 227 | |
10f22dde | 228 | pr_debug("spp_getpage %p\n", ptr); |
14a62c34 | 229 | |
1da177e4 | 230 | return ptr; |
14a62c34 | 231 | } |
1da177e4 | 232 | |
f254f390 | 233 | static pud_t *fill_pud(pgd_t *pgd, unsigned long vaddr) |
1da177e4 | 234 | { |
458a3e64 TH |
235 | if (pgd_none(*pgd)) { |
236 | pud_t *pud = (pud_t *)spp_getpage(); | |
237 | pgd_populate(&init_mm, pgd, pud); | |
238 | if (pud != pud_offset(pgd, 0)) | |
239 | printk(KERN_ERR "PAGETABLE BUG #00! %p <-> %p\n", | |
240 | pud, pud_offset(pgd, 0)); | |
241 | } | |
242 | return pud_offset(pgd, vaddr); | |
243 | } | |
1da177e4 | 244 | |
f254f390 | 245 | static pmd_t *fill_pmd(pud_t *pud, unsigned long vaddr) |
458a3e64 | 246 | { |
1da177e4 | 247 | if (pud_none(*pud)) { |
458a3e64 | 248 | pmd_t *pmd = (pmd_t *) spp_getpage(); |
bb23e403 | 249 | pud_populate(&init_mm, pud, pmd); |
458a3e64 | 250 | if (pmd != pmd_offset(pud, 0)) |
10f22dde | 251 | printk(KERN_ERR "PAGETABLE BUG #01! %p <-> %p\n", |
458a3e64 | 252 | pmd, pmd_offset(pud, 0)); |
1da177e4 | 253 | } |
458a3e64 TH |
254 | return pmd_offset(pud, vaddr); |
255 | } | |
256 | ||
f254f390 | 257 | static pte_t *fill_pte(pmd_t *pmd, unsigned long vaddr) |
458a3e64 | 258 | { |
1da177e4 | 259 | if (pmd_none(*pmd)) { |
458a3e64 | 260 | pte_t *pte = (pte_t *) spp_getpage(); |
bb23e403 | 261 | pmd_populate_kernel(&init_mm, pmd, pte); |
458a3e64 | 262 | if (pte != pte_offset_kernel(pmd, 0)) |
10f22dde | 263 | printk(KERN_ERR "PAGETABLE BUG #02!\n"); |
1da177e4 | 264 | } |
458a3e64 TH |
265 | return pte_offset_kernel(pmd, vaddr); |
266 | } | |
267 | ||
268 | void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte) | |
269 | { | |
270 | pud_t *pud; | |
271 | pmd_t *pmd; | |
272 | pte_t *pte; | |
273 | ||
274 | pud = pud_page + pud_index(vaddr); | |
275 | pmd = fill_pmd(pud, vaddr); | |
276 | pte = fill_pte(pmd, vaddr); | |
1da177e4 | 277 | |
1da177e4 LT |
278 | set_pte(pte, new_pte); |
279 | ||
280 | /* | |
281 | * It's enough to flush this one mapping. | |
282 | * (PGE mappings get flushed as well) | |
283 | */ | |
284 | __flush_tlb_one(vaddr); | |
285 | } | |
286 | ||
458a3e64 | 287 | void set_pte_vaddr(unsigned long vaddr, pte_t pteval) |
0814e0ba EH |
288 | { |
289 | pgd_t *pgd; | |
290 | pud_t *pud_page; | |
291 | ||
292 | pr_debug("set_pte_vaddr %lx to %lx\n", vaddr, native_pte_val(pteval)); | |
293 | ||
294 | pgd = pgd_offset_k(vaddr); | |
295 | if (pgd_none(*pgd)) { | |
296 | printk(KERN_ERR | |
297 | "PGD FIXMAP MISSING, it should be setup in head.S!\n"); | |
298 | return; | |
299 | } | |
300 | pud_page = (pud_t*)pgd_page_vaddr(*pgd); | |
301 | set_pte_vaddr_pud(pud_page, vaddr, pteval); | |
302 | } | |
303 | ||
458a3e64 | 304 | pmd_t * __init populate_extra_pmd(unsigned long vaddr) |
11124411 TH |
305 | { |
306 | pgd_t *pgd; | |
307 | pud_t *pud; | |
308 | ||
309 | pgd = pgd_offset_k(vaddr); | |
458a3e64 TH |
310 | pud = fill_pud(pgd, vaddr); |
311 | return fill_pmd(pud, vaddr); | |
312 | } | |
313 | ||
314 | pte_t * __init populate_extra_pte(unsigned long vaddr) | |
315 | { | |
316 | pmd_t *pmd; | |
11124411 | 317 | |
458a3e64 TH |
318 | pmd = populate_extra_pmd(vaddr); |
319 | return fill_pte(pmd, vaddr); | |
11124411 TH |
320 | } |
321 | ||
3a9e189d JS |
322 | /* |
323 | * Create large page table mappings for a range of physical addresses. | |
324 | */ | |
325 | static void __init __init_extra_mapping(unsigned long phys, unsigned long size, | |
2df58b6d | 326 | enum page_cache_mode cache) |
3a9e189d JS |
327 | { |
328 | pgd_t *pgd; | |
329 | pud_t *pud; | |
330 | pmd_t *pmd; | |
2df58b6d | 331 | pgprot_t prot; |
3a9e189d | 332 | |
2df58b6d JG |
333 | pgprot_val(prot) = pgprot_val(PAGE_KERNEL_LARGE) | |
334 | pgprot_val(pgprot_4k_2_large(cachemode2pgprot(cache))); | |
3a9e189d JS |
335 | BUG_ON((phys & ~PMD_MASK) || (size & ~PMD_MASK)); |
336 | for (; size; phys += PMD_SIZE, size -= PMD_SIZE) { | |
337 | pgd = pgd_offset_k((unsigned long)__va(phys)); | |
338 | if (pgd_none(*pgd)) { | |
339 | pud = (pud_t *) spp_getpage(); | |
340 | set_pgd(pgd, __pgd(__pa(pud) | _KERNPG_TABLE | | |
341 | _PAGE_USER)); | |
342 | } | |
343 | pud = pud_offset(pgd, (unsigned long)__va(phys)); | |
344 | if (pud_none(*pud)) { | |
345 | pmd = (pmd_t *) spp_getpage(); | |
346 | set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE | | |
347 | _PAGE_USER)); | |
348 | } | |
349 | pmd = pmd_offset(pud, phys); | |
350 | BUG_ON(!pmd_none(*pmd)); | |
351 | set_pmd(pmd, __pmd(phys | pgprot_val(prot))); | |
352 | } | |
353 | } | |
354 | ||
355 | void __init init_extra_mapping_wb(unsigned long phys, unsigned long size) | |
356 | { | |
2df58b6d | 357 | __init_extra_mapping(phys, size, _PAGE_CACHE_MODE_WB); |
3a9e189d JS |
358 | } |
359 | ||
360 | void __init init_extra_mapping_uc(unsigned long phys, unsigned long size) | |
361 | { | |
2df58b6d | 362 | __init_extra_mapping(phys, size, _PAGE_CACHE_MODE_UC); |
3a9e189d JS |
363 | } |
364 | ||
31eedd82 | 365 | /* |
88f3aec7 IM |
366 | * The head.S code sets up the kernel high mapping: |
367 | * | |
368 | * from __START_KERNEL_map to __START_KERNEL_map + size (== _end-_text) | |
31eedd82 | 369 | * |
1e3b3081 | 370 | * phys_base holds the negative offset to the kernel, which is added |
31eedd82 TG |
371 | * to the compile time generated pmds. This results in invalid pmds up |
372 | * to the point where we hit the physaddr 0 mapping. | |
373 | * | |
e5f15b45 YL |
374 | * We limit the mappings to the region from _text to _brk_end. _brk_end |
375 | * is rounded up to the 2MB boundary. This catches the invalid pmds as | |
31eedd82 TG |
376 | * well, as they are located before _text: |
377 | */ | |
378 | void __init cleanup_highmap(void) | |
379 | { | |
380 | unsigned long vaddr = __START_KERNEL_map; | |
10054230 | 381 | unsigned long vaddr_end = __START_KERNEL_map + KERNEL_IMAGE_SIZE; |
e5f15b45 | 382 | unsigned long end = roundup((unsigned long)_brk_end, PMD_SIZE) - 1; |
31eedd82 | 383 | pmd_t *pmd = level2_kernel_pgt; |
31eedd82 | 384 | |
10054230 YL |
385 | /* |
386 | * Native path, max_pfn_mapped is not set yet. | |
387 | * Xen has valid max_pfn_mapped set in | |
388 | * arch/x86/xen/mmu.c:xen_setup_kernel_pagetable(). | |
389 | */ | |
390 | if (max_pfn_mapped) | |
391 | vaddr_end = __START_KERNEL_map + (max_pfn_mapped << PAGE_SHIFT); | |
392 | ||
e5f15b45 | 393 | for (; vaddr + PMD_SIZE - 1 < vaddr_end; pmd++, vaddr += PMD_SIZE) { |
2884f110 | 394 | if (pmd_none(*pmd)) |
31eedd82 TG |
395 | continue; |
396 | if (vaddr < (unsigned long) _text || vaddr > end) | |
397 | set_pmd(pmd, __pmd(0)); | |
398 | } | |
399 | } | |
400 | ||
7b16eb89 | 401 | static unsigned long __meminit |
b27a43c1 SS |
402 | phys_pte_init(pte_t *pte_page, unsigned long addr, unsigned long end, |
403 | pgprot_t prot) | |
4f9c11dd | 404 | { |
eceb3632 | 405 | unsigned long pages = 0, next; |
7b16eb89 | 406 | unsigned long last_map_addr = end; |
4f9c11dd | 407 | int i; |
7b16eb89 | 408 | |
4f9c11dd JF |
409 | pte_t *pte = pte_page + pte_index(addr); |
410 | ||
eceb3632 YL |
411 | for (i = pte_index(addr); i < PTRS_PER_PTE; i++, addr = next, pte++) { |
412 | next = (addr & PAGE_MASK) + PAGE_SIZE; | |
4f9c11dd | 413 | if (addr >= end) { |
eceb3632 YL |
414 | if (!after_bootmem && |
415 | !e820_any_mapped(addr & PAGE_MASK, next, E820_RAM) && | |
416 | !e820_any_mapped(addr & PAGE_MASK, next, E820_RESERVED_KERN)) | |
417 | set_pte(pte, __pte(0)); | |
418 | continue; | |
4f9c11dd JF |
419 | } |
420 | ||
b27a43c1 SS |
421 | /* |
422 | * We will re-use the existing mapping. | |
423 | * Xen for example has some special requirements, like mapping | |
424 | * pagetable pages as RO. So assume someone who pre-setup | |
425 | * these mappings are more intelligent. | |
426 | */ | |
3afa3949 | 427 | if (pte_val(*pte)) { |
876ee61a JB |
428 | if (!after_bootmem) |
429 | pages++; | |
4f9c11dd | 430 | continue; |
3afa3949 | 431 | } |
4f9c11dd JF |
432 | |
433 | if (0) | |
434 | printk(" pte=%p addr=%lx pte=%016lx\n", | |
435 | pte, addr, pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL).pte); | |
4f9c11dd | 436 | pages++; |
b27a43c1 | 437 | set_pte(pte, pfn_pte(addr >> PAGE_SHIFT, prot)); |
7b16eb89 | 438 | last_map_addr = (addr & PAGE_MASK) + PAGE_SIZE; |
4f9c11dd | 439 | } |
a2699e47 | 440 | |
4f9c11dd | 441 | update_page_count(PG_LEVEL_4K, pages); |
7b16eb89 YL |
442 | |
443 | return last_map_addr; | |
4f9c11dd JF |
444 | } |
445 | ||
cc615032 | 446 | static unsigned long __meminit |
b50efd2a | 447 | phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end, |
b27a43c1 | 448 | unsigned long page_size_mask, pgprot_t prot) |
44df75e6 | 449 | { |
20167d34 | 450 | unsigned long pages = 0, next; |
7b16eb89 | 451 | unsigned long last_map_addr = end; |
ce0c0e50 | 452 | |
6ad91658 | 453 | int i = pmd_index(address); |
44df75e6 | 454 | |
20167d34 | 455 | for (; i < PTRS_PER_PMD; i++, address = next) { |
6ad91658 | 456 | pmd_t *pmd = pmd_page + pmd_index(address); |
4f9c11dd | 457 | pte_t *pte; |
b27a43c1 | 458 | pgprot_t new_prot = prot; |
44df75e6 | 459 | |
eceb3632 | 460 | next = (address & PMD_MASK) + PMD_SIZE; |
5f51e139 | 461 | if (address >= end) { |
eceb3632 YL |
462 | if (!after_bootmem && |
463 | !e820_any_mapped(address & PMD_MASK, next, E820_RAM) && | |
464 | !e820_any_mapped(address & PMD_MASK, next, E820_RESERVED_KERN)) | |
465 | set_pmd(pmd, __pmd(0)); | |
466 | continue; | |
44df75e6 | 467 | } |
6ad91658 | 468 | |
4f9c11dd | 469 | if (pmd_val(*pmd)) { |
8ae3a5a8 JB |
470 | if (!pmd_large(*pmd)) { |
471 | spin_lock(&init_mm.page_table_lock); | |
973dc4f3 | 472 | pte = (pte_t *)pmd_page_vaddr(*pmd); |
4b239f45 | 473 | last_map_addr = phys_pte_init(pte, address, |
b27a43c1 | 474 | end, prot); |
8ae3a5a8 | 475 | spin_unlock(&init_mm.page_table_lock); |
a2699e47 | 476 | continue; |
8ae3a5a8 | 477 | } |
b27a43c1 SS |
478 | /* |
479 | * If we are ok with PG_LEVEL_2M mapping, then we will | |
480 | * use the existing mapping, | |
481 | * | |
482 | * Otherwise, we will split the large page mapping but | |
483 | * use the same existing protection bits except for | |
484 | * large page, so that we don't violate Intel's TLB | |
485 | * Application note (317080) which says, while changing | |
486 | * the page sizes, new and old translations should | |
487 | * not differ with respect to page frame and | |
488 | * attributes. | |
489 | */ | |
3afa3949 | 490 | if (page_size_mask & (1 << PG_LEVEL_2M)) { |
876ee61a JB |
491 | if (!after_bootmem) |
492 | pages++; | |
20167d34 | 493 | last_map_addr = next; |
b27a43c1 | 494 | continue; |
3afa3949 | 495 | } |
b27a43c1 | 496 | new_prot = pte_pgprot(pte_clrhuge(*(pte_t *)pmd)); |
4f9c11dd JF |
497 | } |
498 | ||
b50efd2a | 499 | if (page_size_mask & (1<<PG_LEVEL_2M)) { |
4f9c11dd | 500 | pages++; |
8ae3a5a8 | 501 | spin_lock(&init_mm.page_table_lock); |
4f9c11dd | 502 | set_pte((pte_t *)pmd, |
960ddb4f | 503 | pfn_pte((address & PMD_MASK) >> PAGE_SHIFT, |
b27a43c1 | 504 | __pgprot(pgprot_val(prot) | _PAGE_PSE))); |
8ae3a5a8 | 505 | spin_unlock(&init_mm.page_table_lock); |
20167d34 | 506 | last_map_addr = next; |
6ad91658 | 507 | continue; |
4f9c11dd | 508 | } |
6ad91658 | 509 | |
868bf4d6 | 510 | pte = alloc_low_page(); |
b27a43c1 | 511 | last_map_addr = phys_pte_init(pte, address, end, new_prot); |
4f9c11dd | 512 | |
8ae3a5a8 | 513 | spin_lock(&init_mm.page_table_lock); |
868bf4d6 | 514 | pmd_populate_kernel(&init_mm, pmd, pte); |
8ae3a5a8 | 515 | spin_unlock(&init_mm.page_table_lock); |
44df75e6 | 516 | } |
ce0c0e50 | 517 | update_page_count(PG_LEVEL_2M, pages); |
7b16eb89 | 518 | return last_map_addr; |
44df75e6 MT |
519 | } |
520 | ||
cc615032 | 521 | static unsigned long __meminit |
b50efd2a YL |
522 | phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end, |
523 | unsigned long page_size_mask) | |
14a62c34 | 524 | { |
20167d34 | 525 | unsigned long pages = 0, next; |
cc615032 | 526 | unsigned long last_map_addr = end; |
6ad91658 | 527 | int i = pud_index(addr); |
44df75e6 | 528 | |
20167d34 | 529 | for (; i < PTRS_PER_PUD; i++, addr = next) { |
6ad91658 | 530 | pud_t *pud = pud_page + pud_index(addr); |
1da177e4 | 531 | pmd_t *pmd; |
b27a43c1 | 532 | pgprot_t prot = PAGE_KERNEL; |
1da177e4 | 533 | |
20167d34 | 534 | next = (addr & PUD_MASK) + PUD_SIZE; |
eceb3632 YL |
535 | if (addr >= end) { |
536 | if (!after_bootmem && | |
537 | !e820_any_mapped(addr & PUD_MASK, next, E820_RAM) && | |
538 | !e820_any_mapped(addr & PUD_MASK, next, E820_RESERVED_KERN)) | |
539 | set_pud(pud, __pud(0)); | |
1da177e4 | 540 | continue; |
14a62c34 | 541 | } |
1da177e4 | 542 | |
6ad91658 | 543 | if (pud_val(*pud)) { |
a2699e47 | 544 | if (!pud_large(*pud)) { |
973dc4f3 | 545 | pmd = pmd_offset(pud, 0); |
4b239f45 | 546 | last_map_addr = phys_pmd_init(pmd, addr, end, |
b27a43c1 | 547 | page_size_mask, prot); |
4b239f45 | 548 | __flush_tlb_all(); |
a2699e47 SS |
549 | continue; |
550 | } | |
b27a43c1 SS |
551 | /* |
552 | * If we are ok with PG_LEVEL_1G mapping, then we will | |
553 | * use the existing mapping. | |
554 | * | |
555 | * Otherwise, we will split the gbpage mapping but use | |
556 | * the same existing protection bits except for large | |
557 | * page, so that we don't violate Intel's TLB | |
558 | * Application note (317080) which says, while changing | |
559 | * the page sizes, new and old translations should | |
560 | * not differ with respect to page frame and | |
561 | * attributes. | |
562 | */ | |
3afa3949 | 563 | if (page_size_mask & (1 << PG_LEVEL_1G)) { |
876ee61a JB |
564 | if (!after_bootmem) |
565 | pages++; | |
20167d34 | 566 | last_map_addr = next; |
b27a43c1 | 567 | continue; |
3afa3949 | 568 | } |
b27a43c1 | 569 | prot = pte_pgprot(pte_clrhuge(*(pte_t *)pud)); |
ef925766 AK |
570 | } |
571 | ||
b50efd2a | 572 | if (page_size_mask & (1<<PG_LEVEL_1G)) { |
ce0c0e50 | 573 | pages++; |
8ae3a5a8 | 574 | spin_lock(&init_mm.page_table_lock); |
ef925766 | 575 | set_pte((pte_t *)pud, |
960ddb4f YL |
576 | pfn_pte((addr & PUD_MASK) >> PAGE_SHIFT, |
577 | PAGE_KERNEL_LARGE)); | |
8ae3a5a8 | 578 | spin_unlock(&init_mm.page_table_lock); |
20167d34 | 579 | last_map_addr = next; |
6ad91658 KM |
580 | continue; |
581 | } | |
582 | ||
868bf4d6 | 583 | pmd = alloc_low_page(); |
b27a43c1 SS |
584 | last_map_addr = phys_pmd_init(pmd, addr, end, page_size_mask, |
585 | prot); | |
8ae3a5a8 JB |
586 | |
587 | spin_lock(&init_mm.page_table_lock); | |
868bf4d6 | 588 | pud_populate(&init_mm, pud, pmd); |
44df75e6 | 589 | spin_unlock(&init_mm.page_table_lock); |
1da177e4 | 590 | } |
1a2b4412 | 591 | __flush_tlb_all(); |
a2699e47 | 592 | |
ce0c0e50 | 593 | update_page_count(PG_LEVEL_1G, pages); |
cc615032 | 594 | |
1a0db38e | 595 | return last_map_addr; |
14a62c34 | 596 | } |
1da177e4 | 597 | |
41d840e2 | 598 | unsigned long __meminit |
f765090a PE |
599 | kernel_physical_mapping_init(unsigned long start, |
600 | unsigned long end, | |
601 | unsigned long page_size_mask) | |
14a62c34 | 602 | { |
9b861528 | 603 | bool pgd_changed = false; |
b50efd2a | 604 | unsigned long next, last_map_addr = end; |
9b861528 | 605 | unsigned long addr; |
1da177e4 LT |
606 | |
607 | start = (unsigned long)__va(start); | |
608 | end = (unsigned long)__va(end); | |
1c5f50ee | 609 | addr = start; |
1da177e4 LT |
610 | |
611 | for (; start < end; start = next) { | |
44df75e6 MT |
612 | pgd_t *pgd = pgd_offset_k(start); |
613 | pud_t *pud; | |
614 | ||
c2bdee59 | 615 | next = (start & PGDIR_MASK) + PGDIR_SIZE; |
4f9c11dd JF |
616 | |
617 | if (pgd_val(*pgd)) { | |
973dc4f3 | 618 | pud = (pud_t *)pgd_page_vaddr(*pgd); |
4b239f45 | 619 | last_map_addr = phys_pud_init(pud, __pa(start), |
b50efd2a | 620 | __pa(end), page_size_mask); |
4f9c11dd JF |
621 | continue; |
622 | } | |
623 | ||
868bf4d6 | 624 | pud = alloc_low_page(); |
c2bdee59 | 625 | last_map_addr = phys_pud_init(pud, __pa(start), __pa(end), |
b50efd2a | 626 | page_size_mask); |
8ae3a5a8 JB |
627 | |
628 | spin_lock(&init_mm.page_table_lock); | |
868bf4d6 | 629 | pgd_populate(&init_mm, pgd, pud); |
8ae3a5a8 | 630 | spin_unlock(&init_mm.page_table_lock); |
9b861528 | 631 | pgd_changed = true; |
14a62c34 | 632 | } |
9b861528 HL |
633 | |
634 | if (pgd_changed) | |
9661d5bc | 635 | sync_global_pgds(addr, end - 1, 0); |
9b861528 | 636 | |
a2699e47 | 637 | __flush_tlb_all(); |
1da177e4 | 638 | |
b50efd2a YL |
639 | return last_map_addr; |
640 | } | |
7b16eb89 | 641 | |
2b97690f | 642 | #ifndef CONFIG_NUMA |
d8fc3afc | 643 | void __init initmem_init(void) |
1f75d7e3 | 644 | { |
e7e8de59 | 645 | memblock_set_node(0, (phys_addr_t)ULLONG_MAX, &memblock.memory, 0); |
1f75d7e3 | 646 | } |
3551f88f | 647 | #endif |
1f75d7e3 | 648 | |
1da177e4 LT |
649 | void __init paging_init(void) |
650 | { | |
3551f88f | 651 | sparse_memory_present_with_active_regions(MAX_NUMNODES); |
44df75e6 | 652 | sparse_init(); |
44b57280 YL |
653 | |
654 | /* | |
655 | * clear the default setting with node 0 | |
656 | * note: don't use nodes_clear here, that is really clearing when | |
657 | * numa support is not compiled in, and later node_set_state | |
658 | * will not set it back. | |
659 | */ | |
4b0ef1fe LJ |
660 | node_clear_state(0, N_MEMORY); |
661 | if (N_MEMORY != N_NORMAL_MEMORY) | |
662 | node_clear_state(0, N_NORMAL_MEMORY); | |
44b57280 | 663 | |
4c0b2e5f | 664 | zone_sizes_init(); |
1da177e4 | 665 | } |
1da177e4 | 666 | |
44df75e6 MT |
667 | /* |
668 | * Memory hotplug specific functions | |
44df75e6 | 669 | */ |
bc02af93 | 670 | #ifdef CONFIG_MEMORY_HOTPLUG |
ea085417 SZ |
671 | /* |
672 | * After memory hotplug the variables max_pfn, max_low_pfn and high_memory need | |
673 | * updating. | |
674 | */ | |
675 | static void update_end_of_memory_vars(u64 start, u64 size) | |
676 | { | |
677 | unsigned long end_pfn = PFN_UP(start + size); | |
678 | ||
679 | if (end_pfn > max_pfn) { | |
680 | max_pfn = end_pfn; | |
681 | max_low_pfn = end_pfn; | |
682 | high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1; | |
683 | } | |
684 | } | |
685 | ||
9d99aaa3 AK |
686 | /* |
687 | * Memory is added always to NORMAL zone. This means you will never get | |
688 | * additional DMA/DMA32 memory. | |
689 | */ | |
033fbae9 | 690 | int arch_add_memory(int nid, u64 start, u64 size, bool for_device) |
44df75e6 | 691 | { |
bc02af93 | 692 | struct pglist_data *pgdat = NODE_DATA(nid); |
9bfc4113 | 693 | struct zone *zone = pgdat->node_zones + |
033fbae9 | 694 | zone_for_memory(nid, start, size, ZONE_NORMAL, for_device); |
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 | { | |
ae9aae9e WC |
715 | unsigned long magic; |
716 | unsigned int nr_pages = 1 << order; | |
717 | ||
718 | /* bootmem page has reserved flag */ | |
719 | if (PageReserved(page)) { | |
720 | __ClearPageReserved(page); | |
ae9aae9e WC |
721 | |
722 | magic = (unsigned long)page->lru.next; | |
723 | if (magic == SECTION_INFO || magic == MIX_SECTION_INFO) { | |
724 | while (nr_pages--) | |
725 | put_page_bootmem(page++); | |
726 | } else | |
170a5a7e JL |
727 | while (nr_pages--) |
728 | free_reserved_page(page++); | |
ae9aae9e WC |
729 | } else |
730 | free_pages((unsigned long)page_address(page), order); | |
ae9aae9e WC |
731 | } |
732 | ||
733 | static void __meminit free_pte_table(pte_t *pte_start, pmd_t *pmd) | |
734 | { | |
735 | pte_t *pte; | |
736 | int i; | |
737 | ||
738 | for (i = 0; i < PTRS_PER_PTE; i++) { | |
739 | pte = pte_start + i; | |
740 | if (pte_val(*pte)) | |
741 | return; | |
742 | } | |
743 | ||
744 | /* free a pte talbe */ | |
745 | free_pagetable(pmd_page(*pmd), 0); | |
746 | spin_lock(&init_mm.page_table_lock); | |
747 | pmd_clear(pmd); | |
748 | spin_unlock(&init_mm.page_table_lock); | |
749 | } | |
750 | ||
751 | static void __meminit free_pmd_table(pmd_t *pmd_start, pud_t *pud) | |
752 | { | |
753 | pmd_t *pmd; | |
754 | int i; | |
755 | ||
756 | for (i = 0; i < PTRS_PER_PMD; i++) { | |
757 | pmd = pmd_start + i; | |
758 | if (pmd_val(*pmd)) | |
759 | return; | |
760 | } | |
761 | ||
762 | /* free a pmd talbe */ | |
763 | free_pagetable(pud_page(*pud), 0); | |
764 | spin_lock(&init_mm.page_table_lock); | |
765 | pud_clear(pud); | |
766 | spin_unlock(&init_mm.page_table_lock); | |
767 | } | |
768 | ||
769 | /* Return true if pgd is changed, otherwise return false. */ | |
770 | static bool __meminit free_pud_table(pud_t *pud_start, pgd_t *pgd) | |
771 | { | |
772 | pud_t *pud; | |
773 | int i; | |
774 | ||
775 | for (i = 0; i < PTRS_PER_PUD; i++) { | |
776 | pud = pud_start + i; | |
777 | if (pud_val(*pud)) | |
778 | return false; | |
779 | } | |
780 | ||
781 | /* free a pud table */ | |
782 | free_pagetable(pgd_page(*pgd), 0); | |
783 | spin_lock(&init_mm.page_table_lock); | |
784 | pgd_clear(pgd); | |
785 | spin_unlock(&init_mm.page_table_lock); | |
786 | ||
787 | return true; | |
788 | } | |
789 | ||
790 | static void __meminit | |
791 | remove_pte_table(pte_t *pte_start, unsigned long addr, unsigned long end, | |
792 | bool direct) | |
793 | { | |
794 | unsigned long next, pages = 0; | |
795 | pte_t *pte; | |
796 | void *page_addr; | |
797 | phys_addr_t phys_addr; | |
798 | ||
799 | pte = pte_start + pte_index(addr); | |
800 | for (; addr < end; addr = next, pte++) { | |
801 | next = (addr + PAGE_SIZE) & PAGE_MASK; | |
802 | if (next > end) | |
803 | next = end; | |
804 | ||
805 | if (!pte_present(*pte)) | |
806 | continue; | |
807 | ||
808 | /* | |
809 | * We mapped [0,1G) memory as identity mapping when | |
810 | * initializing, in arch/x86/kernel/head_64.S. These | |
811 | * pagetables cannot be removed. | |
812 | */ | |
813 | phys_addr = pte_val(*pte) + (addr & PAGE_MASK); | |
814 | if (phys_addr < (phys_addr_t)0x40000000) | |
815 | return; | |
816 | ||
817 | if (IS_ALIGNED(addr, PAGE_SIZE) && | |
818 | IS_ALIGNED(next, PAGE_SIZE)) { | |
819 | /* | |
820 | * Do not free direct mapping pages since they were | |
821 | * freed when offlining, or simplely not in use. | |
822 | */ | |
823 | if (!direct) | |
824 | free_pagetable(pte_page(*pte), 0); | |
825 | ||
826 | spin_lock(&init_mm.page_table_lock); | |
827 | pte_clear(&init_mm, addr, pte); | |
828 | spin_unlock(&init_mm.page_table_lock); | |
829 | ||
830 | /* For non-direct mapping, pages means nothing. */ | |
831 | pages++; | |
832 | } else { | |
833 | /* | |
834 | * If we are here, we are freeing vmemmap pages since | |
835 | * direct mapped memory ranges to be freed are aligned. | |
836 | * | |
837 | * If we are not removing the whole page, it means | |
838 | * other page structs in this page are being used and | |
839 | * we canot remove them. So fill the unused page_structs | |
840 | * with 0xFD, and remove the page when it is wholly | |
841 | * filled with 0xFD. | |
842 | */ | |
843 | memset((void *)addr, PAGE_INUSE, next - addr); | |
844 | ||
845 | page_addr = page_address(pte_page(*pte)); | |
846 | if (!memchr_inv(page_addr, PAGE_INUSE, PAGE_SIZE)) { | |
847 | free_pagetable(pte_page(*pte), 0); | |
848 | ||
849 | spin_lock(&init_mm.page_table_lock); | |
850 | pte_clear(&init_mm, addr, pte); | |
851 | spin_unlock(&init_mm.page_table_lock); | |
852 | } | |
853 | } | |
854 | } | |
855 | ||
856 | /* Call free_pte_table() in remove_pmd_table(). */ | |
857 | flush_tlb_all(); | |
858 | if (direct) | |
859 | update_page_count(PG_LEVEL_4K, -pages); | |
860 | } | |
861 | ||
862 | static void __meminit | |
863 | remove_pmd_table(pmd_t *pmd_start, unsigned long addr, unsigned long end, | |
864 | bool direct) | |
865 | { | |
866 | unsigned long next, pages = 0; | |
867 | pte_t *pte_base; | |
868 | pmd_t *pmd; | |
869 | void *page_addr; | |
870 | ||
871 | pmd = pmd_start + pmd_index(addr); | |
872 | for (; addr < end; addr = next, pmd++) { | |
873 | next = pmd_addr_end(addr, end); | |
874 | ||
875 | if (!pmd_present(*pmd)) | |
876 | continue; | |
877 | ||
878 | if (pmd_large(*pmd)) { | |
879 | if (IS_ALIGNED(addr, PMD_SIZE) && | |
880 | IS_ALIGNED(next, PMD_SIZE)) { | |
881 | if (!direct) | |
882 | free_pagetable(pmd_page(*pmd), | |
883 | get_order(PMD_SIZE)); | |
884 | ||
885 | spin_lock(&init_mm.page_table_lock); | |
886 | pmd_clear(pmd); | |
887 | spin_unlock(&init_mm.page_table_lock); | |
888 | pages++; | |
889 | } else { | |
890 | /* If here, we are freeing vmemmap pages. */ | |
891 | memset((void *)addr, PAGE_INUSE, next - addr); | |
892 | ||
893 | page_addr = page_address(pmd_page(*pmd)); | |
894 | if (!memchr_inv(page_addr, PAGE_INUSE, | |
895 | PMD_SIZE)) { | |
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 | } | |
903 | } | |
904 | ||
905 | continue; | |
906 | } | |
907 | ||
908 | pte_base = (pte_t *)pmd_page_vaddr(*pmd); | |
909 | remove_pte_table(pte_base, addr, next, direct); | |
910 | free_pte_table(pte_base, pmd); | |
911 | } | |
912 | ||
913 | /* Call free_pmd_table() in remove_pud_table(). */ | |
914 | if (direct) | |
915 | update_page_count(PG_LEVEL_2M, -pages); | |
916 | } | |
917 | ||
918 | static void __meminit | |
919 | remove_pud_table(pud_t *pud_start, unsigned long addr, unsigned long end, | |
920 | bool direct) | |
921 | { | |
922 | unsigned long next, pages = 0; | |
923 | pmd_t *pmd_base; | |
924 | pud_t *pud; | |
925 | void *page_addr; | |
926 | ||
927 | pud = pud_start + pud_index(addr); | |
928 | for (; addr < end; addr = next, pud++) { | |
929 | next = pud_addr_end(addr, end); | |
930 | ||
931 | if (!pud_present(*pud)) | |
932 | continue; | |
933 | ||
934 | if (pud_large(*pud)) { | |
935 | if (IS_ALIGNED(addr, PUD_SIZE) && | |
936 | IS_ALIGNED(next, PUD_SIZE)) { | |
937 | if (!direct) | |
938 | free_pagetable(pud_page(*pud), | |
939 | get_order(PUD_SIZE)); | |
940 | ||
941 | spin_lock(&init_mm.page_table_lock); | |
942 | pud_clear(pud); | |
943 | spin_unlock(&init_mm.page_table_lock); | |
944 | pages++; | |
945 | } else { | |
946 | /* If here, we are freeing vmemmap pages. */ | |
947 | memset((void *)addr, PAGE_INUSE, next - addr); | |
948 | ||
949 | page_addr = page_address(pud_page(*pud)); | |
950 | if (!memchr_inv(page_addr, PAGE_INUSE, | |
951 | PUD_SIZE)) { | |
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 | } | |
959 | } | |
960 | ||
961 | continue; | |
962 | } | |
963 | ||
964 | pmd_base = (pmd_t *)pud_page_vaddr(*pud); | |
965 | remove_pmd_table(pmd_base, addr, next, direct); | |
966 | free_pmd_table(pmd_base, pud); | |
967 | } | |
968 | ||
969 | if (direct) | |
970 | update_page_count(PG_LEVEL_1G, -pages); | |
971 | } | |
972 | ||
973 | /* start and end are both virtual address. */ | |
974 | static void __meminit | |
975 | remove_pagetable(unsigned long start, unsigned long end, bool direct) | |
976 | { | |
977 | unsigned long next; | |
5255e0a7 | 978 | unsigned long addr; |
ae9aae9e WC |
979 | pgd_t *pgd; |
980 | pud_t *pud; | |
981 | bool pgd_changed = false; | |
982 | ||
5255e0a7 YI |
983 | for (addr = start; addr < end; addr = next) { |
984 | next = pgd_addr_end(addr, end); | |
ae9aae9e | 985 | |
5255e0a7 | 986 | pgd = pgd_offset_k(addr); |
ae9aae9e WC |
987 | if (!pgd_present(*pgd)) |
988 | continue; | |
989 | ||
990 | pud = (pud_t *)pgd_page_vaddr(*pgd); | |
5255e0a7 | 991 | remove_pud_table(pud, addr, next, direct); |
ae9aae9e WC |
992 | if (free_pud_table(pud, pgd)) |
993 | pgd_changed = true; | |
994 | } | |
995 | ||
996 | if (pgd_changed) | |
9661d5bc | 997 | sync_global_pgds(start, end - 1, 1); |
ae9aae9e WC |
998 | |
999 | flush_tlb_all(); | |
1000 | } | |
1001 | ||
0aad818b | 1002 | void __ref vmemmap_free(unsigned long start, unsigned long end) |
0197518c | 1003 | { |
0197518c TC |
1004 | remove_pagetable(start, end, false); |
1005 | } | |
1006 | ||
587ff8c4 | 1007 | #ifdef CONFIG_MEMORY_HOTREMOVE |
bbcab878 TC |
1008 | static void __meminit |
1009 | kernel_physical_mapping_remove(unsigned long start, unsigned long end) | |
1010 | { | |
1011 | start = (unsigned long)__va(start); | |
1012 | end = (unsigned long)__va(end); | |
1013 | ||
1014 | remove_pagetable(start, end, true); | |
1015 | } | |
1016 | ||
24d335ca WC |
1017 | int __ref arch_remove_memory(u64 start, u64 size) |
1018 | { | |
1019 | unsigned long start_pfn = start >> PAGE_SHIFT; | |
1020 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
1021 | struct zone *zone; | |
1022 | int ret; | |
1023 | ||
1024 | zone = page_zone(pfn_to_page(start_pfn)); | |
bbcab878 | 1025 | kernel_physical_mapping_remove(start, start + size); |
24d335ca WC |
1026 | ret = __remove_pages(zone, start_pfn, nr_pages); |
1027 | WARN_ON_ONCE(ret); | |
1028 | ||
1029 | return ret; | |
1030 | } | |
1031 | #endif | |
45e0b78b KM |
1032 | #endif /* CONFIG_MEMORY_HOTPLUG */ |
1033 | ||
81ac3ad9 | 1034 | static struct kcore_list kcore_vsyscall; |
1da177e4 | 1035 | |
94b43c3d YL |
1036 | static void __init register_page_bootmem_info(void) |
1037 | { | |
1038 | #ifdef CONFIG_NUMA | |
1039 | int i; | |
1040 | ||
1041 | for_each_online_node(i) | |
1042 | register_page_bootmem_info_node(NODE_DATA(i)); | |
1043 | #endif | |
1044 | } | |
1045 | ||
1da177e4 LT |
1046 | void __init mem_init(void) |
1047 | { | |
0dc243ae | 1048 | pci_iommu_alloc(); |
1da177e4 | 1049 | |
48ddb154 | 1050 | /* clear_bss() already clear the empty_zero_page */ |
1da177e4 | 1051 | |
94b43c3d | 1052 | register_page_bootmem_info(); |
bced0e32 JL |
1053 | |
1054 | /* this will put all memory onto the freelists */ | |
0c988534 | 1055 | free_all_bootmem(); |
1da177e4 LT |
1056 | after_bootmem = 1; |
1057 | ||
1da177e4 | 1058 | /* Register memory areas for /proc/kcore */ |
f40c3300 AL |
1059 | kclist_add(&kcore_vsyscall, (void *)VSYSCALL_ADDR, |
1060 | PAGE_SIZE, KCORE_OTHER); | |
1da177e4 | 1061 | |
46a84132 | 1062 | mem_init_print_info(NULL); |
1da177e4 LT |
1063 | } |
1064 | ||
67df197b | 1065 | #ifdef CONFIG_DEBUG_RODATA |
edeed305 AV |
1066 | const int rodata_test_data = 0xC3; |
1067 | EXPORT_SYMBOL_GPL(rodata_test_data); | |
67df197b | 1068 | |
502f6604 | 1069 | int kernel_set_to_readonly; |
16239630 SR |
1070 | |
1071 | void set_kernel_text_rw(void) | |
1072 | { | |
b9af7c0d | 1073 | unsigned long start = PFN_ALIGN(_text); |
e7d23dde | 1074 | unsigned long end = PFN_ALIGN(__stop___ex_table); |
16239630 SR |
1075 | |
1076 | if (!kernel_set_to_readonly) | |
1077 | return; | |
1078 | ||
1079 | pr_debug("Set kernel text: %lx - %lx for read write\n", | |
1080 | start, end); | |
1081 | ||
e7d23dde SS |
1082 | /* |
1083 | * Make the kernel identity mapping for text RW. Kernel text | |
1084 | * mapping will always be RO. Refer to the comment in | |
1085 | * static_protections() in pageattr.c | |
1086 | */ | |
16239630 SR |
1087 | set_memory_rw(start, (end - start) >> PAGE_SHIFT); |
1088 | } | |
1089 | ||
1090 | void set_kernel_text_ro(void) | |
1091 | { | |
b9af7c0d | 1092 | unsigned long start = PFN_ALIGN(_text); |
e7d23dde | 1093 | unsigned long end = PFN_ALIGN(__stop___ex_table); |
16239630 SR |
1094 | |
1095 | if (!kernel_set_to_readonly) | |
1096 | return; | |
1097 | ||
1098 | pr_debug("Set kernel text: %lx - %lx for read only\n", | |
1099 | start, end); | |
1100 | ||
e7d23dde SS |
1101 | /* |
1102 | * Set the kernel identity mapping for text RO. | |
1103 | */ | |
16239630 SR |
1104 | set_memory_ro(start, (end - start) >> PAGE_SHIFT); |
1105 | } | |
1106 | ||
67df197b AV |
1107 | void mark_rodata_ro(void) |
1108 | { | |
74e08179 | 1109 | unsigned long start = PFN_ALIGN(_text); |
fc8d7826 | 1110 | unsigned long rodata_start = PFN_ALIGN(__start_rodata); |
74e08179 | 1111 | unsigned long end = (unsigned long) &__end_rodata_hpage_align; |
fc8d7826 AD |
1112 | unsigned long text_end = PFN_ALIGN(&__stop___ex_table); |
1113 | unsigned long rodata_end = PFN_ALIGN(&__end_rodata); | |
45e2a9d4 | 1114 | unsigned long all_end; |
8f0f996e | 1115 | |
6fb14755 | 1116 | printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n", |
e3ebadd9 | 1117 | (end - start) >> 10); |
984bb80d AV |
1118 | set_memory_ro(start, (end - start) >> PAGE_SHIFT); |
1119 | ||
16239630 SR |
1120 | kernel_set_to_readonly = 1; |
1121 | ||
984bb80d | 1122 | /* |
72212675 YL |
1123 | * The rodata/data/bss/brk section (but not the kernel text!) |
1124 | * should also be not-executable. | |
45e2a9d4 KC |
1125 | * |
1126 | * We align all_end to PMD_SIZE because the existing mapping | |
1127 | * is a full PMD. If we would align _brk_end to PAGE_SIZE we | |
1128 | * split the PMD and the reminder between _brk_end and the end | |
1129 | * of the PMD will remain mapped executable. | |
1130 | * | |
1131 | * Any PMD which was setup after the one which covers _brk_end | |
1132 | * has been zapped already via cleanup_highmem(). | |
984bb80d | 1133 | */ |
45e2a9d4 | 1134 | all_end = roundup((unsigned long)_brk_end, PMD_SIZE); |
ab76f7b4 | 1135 | set_memory_nx(text_end, (all_end - text_end) >> PAGE_SHIFT); |
67df197b | 1136 | |
1a487252 AV |
1137 | rodata_test(); |
1138 | ||
0c42f392 | 1139 | #ifdef CONFIG_CPA_DEBUG |
10f22dde | 1140 | printk(KERN_INFO "Testing CPA: undo %lx-%lx\n", start, end); |
6d238cc4 | 1141 | set_memory_rw(start, (end-start) >> PAGE_SHIFT); |
0c42f392 | 1142 | |
10f22dde | 1143 | printk(KERN_INFO "Testing CPA: again\n"); |
6d238cc4 | 1144 | set_memory_ro(start, (end-start) >> PAGE_SHIFT); |
0c42f392 | 1145 | #endif |
74e08179 | 1146 | |
c88442ec | 1147 | free_init_pages("unused kernel", |
fc8d7826 AD |
1148 | (unsigned long) __va(__pa_symbol(text_end)), |
1149 | (unsigned long) __va(__pa_symbol(rodata_start))); | |
c88442ec | 1150 | free_init_pages("unused kernel", |
fc8d7826 AD |
1151 | (unsigned long) __va(__pa_symbol(rodata_end)), |
1152 | (unsigned long) __va(__pa_symbol(_sdata))); | |
e1a58320 SS |
1153 | |
1154 | debug_checkwx(); | |
67df197b | 1155 | } |
4e4eee0e | 1156 | |
67df197b AV |
1157 | #endif |
1158 | ||
14a62c34 TG |
1159 | int kern_addr_valid(unsigned long addr) |
1160 | { | |
1da177e4 | 1161 | unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT; |
14a62c34 TG |
1162 | pgd_t *pgd; |
1163 | pud_t *pud; | |
1164 | pmd_t *pmd; | |
1165 | pte_t *pte; | |
1da177e4 LT |
1166 | |
1167 | if (above != 0 && above != -1UL) | |
14a62c34 TG |
1168 | return 0; |
1169 | ||
1da177e4 LT |
1170 | pgd = pgd_offset_k(addr); |
1171 | if (pgd_none(*pgd)) | |
1172 | return 0; | |
1173 | ||
1174 | pud = pud_offset(pgd, addr); | |
1175 | if (pud_none(*pud)) | |
14a62c34 | 1176 | return 0; |
1da177e4 | 1177 | |
0ee364eb MG |
1178 | if (pud_large(*pud)) |
1179 | return pfn_valid(pud_pfn(*pud)); | |
1180 | ||
1da177e4 LT |
1181 | pmd = pmd_offset(pud, addr); |
1182 | if (pmd_none(*pmd)) | |
1183 | return 0; | |
14a62c34 | 1184 | |
1da177e4 LT |
1185 | if (pmd_large(*pmd)) |
1186 | return pfn_valid(pmd_pfn(*pmd)); | |
1187 | ||
1188 | pte = pte_offset_kernel(pmd, addr); | |
1189 | if (pte_none(*pte)) | |
1190 | return 0; | |
14a62c34 | 1191 | |
1da177e4 LT |
1192 | return pfn_valid(pte_pfn(*pte)); |
1193 | } | |
1194 | ||
982792c7 | 1195 | static unsigned long probe_memory_block_size(void) |
1dc41aa6 | 1196 | { |
982792c7 YL |
1197 | /* start from 2g */ |
1198 | unsigned long bz = 1UL<<31; | |
1199 | ||
bdee237c DB |
1200 | if (totalram_pages >= (64ULL << (30 - PAGE_SHIFT))) { |
1201 | pr_info("Using 2GB memory block size for large-memory system\n"); | |
1dc41aa6 NF |
1202 | return 2UL * 1024 * 1024 * 1024; |
1203 | } | |
1dc41aa6 | 1204 | |
982792c7 YL |
1205 | /* less than 64g installed */ |
1206 | if ((max_pfn << PAGE_SHIFT) < (16UL << 32)) | |
1207 | return MIN_MEMORY_BLOCK_SIZE; | |
1208 | ||
1209 | /* get the tail size */ | |
1210 | while (bz > MIN_MEMORY_BLOCK_SIZE) { | |
1211 | if (!((max_pfn << PAGE_SHIFT) & (bz - 1))) | |
1212 | break; | |
1213 | bz >>= 1; | |
1214 | } | |
1215 | ||
1216 | printk(KERN_DEBUG "memory block size : %ldMB\n", bz >> 20); | |
1217 | ||
1218 | return bz; | |
1219 | } | |
1220 | ||
1221 | static unsigned long memory_block_size_probed; | |
1222 | unsigned long memory_block_size_bytes(void) | |
1223 | { | |
1224 | if (!memory_block_size_probed) | |
1225 | memory_block_size_probed = probe_memory_block_size(); | |
1226 | ||
1227 | return memory_block_size_probed; | |
1228 | } | |
1229 | ||
0889eba5 CL |
1230 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
1231 | /* | |
1232 | * Initialise the sparsemem vmemmap using huge-pages at the PMD level. | |
1233 | */ | |
c2b91e2e YL |
1234 | static long __meminitdata addr_start, addr_end; |
1235 | static void __meminitdata *p_start, *p_end; | |
1236 | static int __meminitdata node_start; | |
1237 | ||
e8216da5 JW |
1238 | static int __meminit vmemmap_populate_hugepages(unsigned long start, |
1239 | unsigned long end, int node) | |
0889eba5 | 1240 | { |
0aad818b | 1241 | unsigned long addr; |
0889eba5 CL |
1242 | unsigned long next; |
1243 | pgd_t *pgd; | |
1244 | pud_t *pud; | |
1245 | pmd_t *pmd; | |
1246 | ||
0aad818b | 1247 | for (addr = start; addr < end; addr = next) { |
e8216da5 | 1248 | next = pmd_addr_end(addr, end); |
0889eba5 CL |
1249 | |
1250 | pgd = vmemmap_pgd_populate(addr, node); | |
1251 | if (!pgd) | |
1252 | return -ENOMEM; | |
14a62c34 | 1253 | |
0889eba5 CL |
1254 | pud = vmemmap_pud_populate(pgd, addr, node); |
1255 | if (!pud) | |
1256 | return -ENOMEM; | |
1257 | ||
e8216da5 JW |
1258 | pmd = pmd_offset(pud, addr); |
1259 | if (pmd_none(*pmd)) { | |
e8216da5 | 1260 | void *p; |
14a62c34 | 1261 | |
e8216da5 | 1262 | p = vmemmap_alloc_block_buf(PMD_SIZE, node); |
8e2cdbcb JW |
1263 | if (p) { |
1264 | pte_t entry; | |
1265 | ||
1266 | entry = pfn_pte(__pa(p) >> PAGE_SHIFT, | |
1267 | PAGE_KERNEL_LARGE); | |
1268 | set_pmd(pmd, __pmd(pte_val(entry))); | |
1269 | ||
1270 | /* check to see if we have contiguous blocks */ | |
1271 | if (p_end != p || node_start != node) { | |
1272 | if (p_start) | |
1273 | printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n", | |
1274 | addr_start, addr_end-1, p_start, p_end-1, node_start); | |
1275 | addr_start = addr; | |
1276 | node_start = node; | |
1277 | p_start = p; | |
1278 | } | |
7c934d39 | 1279 | |
8e2cdbcb JW |
1280 | addr_end = addr + PMD_SIZE; |
1281 | p_end = p + PMD_SIZE; | |
1282 | continue; | |
1283 | } | |
1284 | } else if (pmd_large(*pmd)) { | |
e8216da5 | 1285 | vmemmap_verify((pte_t *)pmd, node, addr, next); |
8e2cdbcb JW |
1286 | continue; |
1287 | } | |
1288 | pr_warn_once("vmemmap: falling back to regular page backing\n"); | |
1289 | if (vmemmap_populate_basepages(addr, next, node)) | |
1290 | return -ENOMEM; | |
0889eba5 | 1291 | } |
0889eba5 CL |
1292 | return 0; |
1293 | } | |
c2b91e2e | 1294 | |
e8216da5 JW |
1295 | int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node) |
1296 | { | |
1297 | int err; | |
1298 | ||
1299 | if (cpu_has_pse) | |
1300 | err = vmemmap_populate_hugepages(start, end, node); | |
1301 | else | |
1302 | err = vmemmap_populate_basepages(start, end, node); | |
1303 | if (!err) | |
9661d5bc | 1304 | sync_global_pgds(start, end - 1, 0); |
e8216da5 JW |
1305 | return err; |
1306 | } | |
1307 | ||
46723bfa YI |
1308 | #if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HAVE_BOOTMEM_INFO_NODE) |
1309 | void register_page_bootmem_memmap(unsigned long section_nr, | |
1310 | struct page *start_page, unsigned long size) | |
1311 | { | |
1312 | unsigned long addr = (unsigned long)start_page; | |
1313 | unsigned long end = (unsigned long)(start_page + size); | |
1314 | unsigned long next; | |
1315 | pgd_t *pgd; | |
1316 | pud_t *pud; | |
1317 | pmd_t *pmd; | |
1318 | unsigned int nr_pages; | |
1319 | struct page *page; | |
1320 | ||
1321 | for (; addr < end; addr = next) { | |
1322 | pte_t *pte = NULL; | |
1323 | ||
1324 | pgd = pgd_offset_k(addr); | |
1325 | if (pgd_none(*pgd)) { | |
1326 | next = (addr + PAGE_SIZE) & PAGE_MASK; | |
1327 | continue; | |
1328 | } | |
1329 | get_page_bootmem(section_nr, pgd_page(*pgd), MIX_SECTION_INFO); | |
1330 | ||
1331 | pud = pud_offset(pgd, addr); | |
1332 | if (pud_none(*pud)) { | |
1333 | next = (addr + PAGE_SIZE) & PAGE_MASK; | |
1334 | continue; | |
1335 | } | |
1336 | get_page_bootmem(section_nr, pud_page(*pud), MIX_SECTION_INFO); | |
1337 | ||
1338 | if (!cpu_has_pse) { | |
1339 | next = (addr + PAGE_SIZE) & PAGE_MASK; | |
1340 | pmd = pmd_offset(pud, addr); | |
1341 | if (pmd_none(*pmd)) | |
1342 | continue; | |
1343 | get_page_bootmem(section_nr, pmd_page(*pmd), | |
1344 | MIX_SECTION_INFO); | |
1345 | ||
1346 | pte = pte_offset_kernel(pmd, addr); | |
1347 | if (pte_none(*pte)) | |
1348 | continue; | |
1349 | get_page_bootmem(section_nr, pte_page(*pte), | |
1350 | SECTION_INFO); | |
1351 | } else { | |
1352 | next = pmd_addr_end(addr, end); | |
1353 | ||
1354 | pmd = pmd_offset(pud, addr); | |
1355 | if (pmd_none(*pmd)) | |
1356 | continue; | |
1357 | ||
1358 | nr_pages = 1 << (get_order(PMD_SIZE)); | |
1359 | page = pmd_page(*pmd); | |
1360 | while (nr_pages--) | |
1361 | get_page_bootmem(section_nr, page++, | |
1362 | SECTION_INFO); | |
1363 | } | |
1364 | } | |
1365 | } | |
1366 | #endif | |
1367 | ||
c2b91e2e YL |
1368 | void __meminit vmemmap_populate_print_last(void) |
1369 | { | |
1370 | if (p_start) { | |
1371 | printk(KERN_DEBUG " [%lx-%lx] PMD -> [%p-%p] on node %d\n", | |
1372 | addr_start, addr_end-1, p_start, p_end-1, node_start); | |
1373 | p_start = NULL; | |
1374 | p_end = NULL; | |
1375 | node_start = 0; | |
1376 | } | |
1377 | } | |
0889eba5 | 1378 | #endif |