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> |
4b94ffdc | 33 | #include <linux/memremap.h> |
ae32b129 | 34 | #include <linux/nmi.h> |
5a0e3ad6 | 35 | #include <linux/gfp.h> |
2f96b8c1 | 36 | #include <linux/kcore.h> |
1da177e4 LT |
37 | |
38 | #include <asm/processor.h> | |
46eaa670 | 39 | #include <asm/bios_ebda.h> |
1da177e4 LT |
40 | #include <asm/uaccess.h> |
41 | #include <asm/pgtable.h> | |
42 | #include <asm/pgalloc.h> | |
43 | #include <asm/dma.h> | |
44 | #include <asm/fixmap.h> | |
45 | #include <asm/e820.h> | |
46 | #include <asm/apic.h> | |
47 | #include <asm/tlb.h> | |
48 | #include <asm/mmu_context.h> | |
49 | #include <asm/proto.h> | |
50 | #include <asm/smp.h> | |
2bc0414e | 51 | #include <asm/sections.h> |
718fc13b | 52 | #include <asm/kdebug.h> |
aaa64e04 | 53 | #include <asm/numa.h> |
7bfeab9a | 54 | #include <asm/cacheflush.h> |
4fcb2083 | 55 | #include <asm/init.h> |
43c75f93 | 56 | #include <asm/uv/uv.h> |
e5f15b45 | 57 | #include <asm/setup.h> |
1da177e4 | 58 | |
5c51bdbe YL |
59 | #include "mm_internal.h" |
60 | ||
cf4fb15b | 61 | #include "ident_map.c" |
aece2785 | 62 | |
1da177e4 LT |
63 | /* |
64 | * NOTE: pagetable_init alloc all the fixmap pagetables contiguous on the | |
65 | * physical space so we can cache the place of the first one and move | |
66 | * around without checking the pgd every time. | |
67 | */ | |
68 | ||
f955371c | 69 | pteval_t __supported_pte_mask __read_mostly = ~0; |
bd220a24 YL |
70 | EXPORT_SYMBOL_GPL(__supported_pte_mask); |
71 | ||
bd220a24 YL |
72 | int force_personality32; |
73 | ||
deed05b7 IM |
74 | /* |
75 | * noexec32=on|off | |
76 | * Control non executable heap for 32bit processes. | |
77 | * To control the stack too use noexec=off | |
78 | * | |
79 | * on PROT_READ does not imply PROT_EXEC for 32-bit processes (default) | |
80 | * off PROT_READ implies PROT_EXEC | |
81 | */ | |
bd220a24 YL |
82 | static int __init nonx32_setup(char *str) |
83 | { | |
84 | if (!strcmp(str, "on")) | |
85 | force_personality32 &= ~READ_IMPLIES_EXEC; | |
86 | else if (!strcmp(str, "off")) | |
87 | force_personality32 |= READ_IMPLIES_EXEC; | |
88 | return 1; | |
89 | } | |
90 | __setup("noexec32=", nonx32_setup); | |
91 | ||
6afb5157 HL |
92 | /* |
93 | * When memory was added/removed make sure all the processes MM have | |
94 | * suitable PGD entries in the local PGD level page. | |
95 | */ | |
9661d5bc | 96 | void sync_global_pgds(unsigned long start, unsigned long end, int removed) |
6afb5157 | 97 | { |
44235dcd JF |
98 | unsigned long address; |
99 | ||
100 | for (address = start; address <= end; address += PGDIR_SIZE) { | |
101 | const pgd_t *pgd_ref = pgd_offset_k(address); | |
44235dcd JF |
102 | struct page *page; |
103 | ||
9661d5bc YI |
104 | /* |
105 | * When it is called after memory hot remove, pgd_none() | |
106 | * returns true. In this case (removed == 1), we must clear | |
107 | * the PGD entries in the local PGD level page. | |
108 | */ | |
109 | if (pgd_none(*pgd_ref) && !removed) | |
44235dcd JF |
110 | continue; |
111 | ||
a79e53d8 | 112 | spin_lock(&pgd_lock); |
44235dcd | 113 | list_for_each_entry(page, &pgd_list, lru) { |
be354f40 | 114 | pgd_t *pgd; |
617d34d9 JF |
115 | spinlock_t *pgt_lock; |
116 | ||
44235dcd | 117 | pgd = (pgd_t *)page_address(page) + pgd_index(address); |
a79e53d8 | 118 | /* the pgt_lock only for Xen */ |
617d34d9 JF |
119 | pgt_lock = &pgd_page_get_mm(page)->page_table_lock; |
120 | spin_lock(pgt_lock); | |
121 | ||
9661d5bc | 122 | if (!pgd_none(*pgd_ref) && !pgd_none(*pgd)) |
44235dcd JF |
123 | BUG_ON(pgd_page_vaddr(*pgd) |
124 | != pgd_page_vaddr(*pgd_ref)); | |
617d34d9 | 125 | |
9661d5bc YI |
126 | if (removed) { |
127 | if (pgd_none(*pgd_ref) && !pgd_none(*pgd)) | |
128 | pgd_clear(pgd); | |
129 | } else { | |
130 | if (pgd_none(*pgd)) | |
131 | set_pgd(pgd, *pgd_ref); | |
132 | } | |
133 | ||
617d34d9 | 134 | spin_unlock(pgt_lock); |
44235dcd | 135 | } |
a79e53d8 | 136 | spin_unlock(&pgd_lock); |
44235dcd | 137 | } |
6afb5157 HL |
138 | } |
139 | ||
8d6ea967 MS |
140 | /* |
141 | * NOTE: This function is marked __ref because it calls __init function | |
142 | * (alloc_bootmem_pages). It's safe to do it ONLY when after_bootmem == 0. | |
143 | */ | |
144 | static __ref void *spp_getpage(void) | |
14a62c34 | 145 | { |
1da177e4 | 146 | void *ptr; |
14a62c34 | 147 | |
1da177e4 | 148 | if (after_bootmem) |
9e730237 | 149 | ptr = (void *) get_zeroed_page(GFP_ATOMIC | __GFP_NOTRACK); |
1da177e4 LT |
150 | else |
151 | ptr = alloc_bootmem_pages(PAGE_SIZE); | |
14a62c34 TG |
152 | |
153 | if (!ptr || ((unsigned long)ptr & ~PAGE_MASK)) { | |
154 | panic("set_pte_phys: cannot allocate page data %s\n", | |
155 | after_bootmem ? "after bootmem" : ""); | |
156 | } | |
1da177e4 | 157 | |
10f22dde | 158 | pr_debug("spp_getpage %p\n", ptr); |
14a62c34 | 159 | |
1da177e4 | 160 | return ptr; |
14a62c34 | 161 | } |
1da177e4 | 162 | |
f254f390 | 163 | static pud_t *fill_pud(pgd_t *pgd, unsigned long vaddr) |
1da177e4 | 164 | { |
458a3e64 TH |
165 | if (pgd_none(*pgd)) { |
166 | pud_t *pud = (pud_t *)spp_getpage(); | |
167 | pgd_populate(&init_mm, pgd, pud); | |
168 | if (pud != pud_offset(pgd, 0)) | |
169 | printk(KERN_ERR "PAGETABLE BUG #00! %p <-> %p\n", | |
170 | pud, pud_offset(pgd, 0)); | |
171 | } | |
172 | return pud_offset(pgd, vaddr); | |
173 | } | |
1da177e4 | 174 | |
f254f390 | 175 | static pmd_t *fill_pmd(pud_t *pud, unsigned long vaddr) |
458a3e64 | 176 | { |
1da177e4 | 177 | if (pud_none(*pud)) { |
458a3e64 | 178 | pmd_t *pmd = (pmd_t *) spp_getpage(); |
bb23e403 | 179 | pud_populate(&init_mm, pud, pmd); |
458a3e64 | 180 | if (pmd != pmd_offset(pud, 0)) |
10f22dde | 181 | printk(KERN_ERR "PAGETABLE BUG #01! %p <-> %p\n", |
458a3e64 | 182 | pmd, pmd_offset(pud, 0)); |
1da177e4 | 183 | } |
458a3e64 TH |
184 | return pmd_offset(pud, vaddr); |
185 | } | |
186 | ||
f254f390 | 187 | static pte_t *fill_pte(pmd_t *pmd, unsigned long vaddr) |
458a3e64 | 188 | { |
1da177e4 | 189 | if (pmd_none(*pmd)) { |
458a3e64 | 190 | pte_t *pte = (pte_t *) spp_getpage(); |
bb23e403 | 191 | pmd_populate_kernel(&init_mm, pmd, pte); |
458a3e64 | 192 | if (pte != pte_offset_kernel(pmd, 0)) |
10f22dde | 193 | printk(KERN_ERR "PAGETABLE BUG #02!\n"); |
1da177e4 | 194 | } |
458a3e64 TH |
195 | return pte_offset_kernel(pmd, vaddr); |
196 | } | |
197 | ||
198 | void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte) | |
199 | { | |
200 | pud_t *pud; | |
201 | pmd_t *pmd; | |
202 | pte_t *pte; | |
203 | ||
204 | pud = pud_page + pud_index(vaddr); | |
205 | pmd = fill_pmd(pud, vaddr); | |
206 | pte = fill_pte(pmd, vaddr); | |
1da177e4 | 207 | |
1da177e4 LT |
208 | set_pte(pte, new_pte); |
209 | ||
210 | /* | |
211 | * It's enough to flush this one mapping. | |
212 | * (PGE mappings get flushed as well) | |
213 | */ | |
214 | __flush_tlb_one(vaddr); | |
215 | } | |
216 | ||
458a3e64 | 217 | void set_pte_vaddr(unsigned long vaddr, pte_t pteval) |
0814e0ba EH |
218 | { |
219 | pgd_t *pgd; | |
220 | pud_t *pud_page; | |
221 | ||
222 | pr_debug("set_pte_vaddr %lx to %lx\n", vaddr, native_pte_val(pteval)); | |
223 | ||
224 | pgd = pgd_offset_k(vaddr); | |
225 | if (pgd_none(*pgd)) { | |
226 | printk(KERN_ERR | |
227 | "PGD FIXMAP MISSING, it should be setup in head.S!\n"); | |
228 | return; | |
229 | } | |
230 | pud_page = (pud_t*)pgd_page_vaddr(*pgd); | |
231 | set_pte_vaddr_pud(pud_page, vaddr, pteval); | |
232 | } | |
233 | ||
458a3e64 | 234 | pmd_t * __init populate_extra_pmd(unsigned long vaddr) |
11124411 TH |
235 | { |
236 | pgd_t *pgd; | |
237 | pud_t *pud; | |
238 | ||
239 | pgd = pgd_offset_k(vaddr); | |
458a3e64 TH |
240 | pud = fill_pud(pgd, vaddr); |
241 | return fill_pmd(pud, vaddr); | |
242 | } | |
243 | ||
244 | pte_t * __init populate_extra_pte(unsigned long vaddr) | |
245 | { | |
246 | pmd_t *pmd; | |
11124411 | 247 | |
458a3e64 TH |
248 | pmd = populate_extra_pmd(vaddr); |
249 | return fill_pte(pmd, vaddr); | |
11124411 TH |
250 | } |
251 | ||
3a9e189d JS |
252 | /* |
253 | * Create large page table mappings for a range of physical addresses. | |
254 | */ | |
255 | static void __init __init_extra_mapping(unsigned long phys, unsigned long size, | |
2df58b6d | 256 | enum page_cache_mode cache) |
3a9e189d JS |
257 | { |
258 | pgd_t *pgd; | |
259 | pud_t *pud; | |
260 | pmd_t *pmd; | |
2df58b6d | 261 | pgprot_t prot; |
3a9e189d | 262 | |
2df58b6d JG |
263 | pgprot_val(prot) = pgprot_val(PAGE_KERNEL_LARGE) | |
264 | pgprot_val(pgprot_4k_2_large(cachemode2pgprot(cache))); | |
3a9e189d JS |
265 | BUG_ON((phys & ~PMD_MASK) || (size & ~PMD_MASK)); |
266 | for (; size; phys += PMD_SIZE, size -= PMD_SIZE) { | |
267 | pgd = pgd_offset_k((unsigned long)__va(phys)); | |
268 | if (pgd_none(*pgd)) { | |
269 | pud = (pud_t *) spp_getpage(); | |
270 | set_pgd(pgd, __pgd(__pa(pud) | _KERNPG_TABLE | | |
271 | _PAGE_USER)); | |
272 | } | |
273 | pud = pud_offset(pgd, (unsigned long)__va(phys)); | |
274 | if (pud_none(*pud)) { | |
275 | pmd = (pmd_t *) spp_getpage(); | |
276 | set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE | | |
277 | _PAGE_USER)); | |
278 | } | |
279 | pmd = pmd_offset(pud, phys); | |
280 | BUG_ON(!pmd_none(*pmd)); | |
281 | set_pmd(pmd, __pmd(phys | pgprot_val(prot))); | |
282 | } | |
283 | } | |
284 | ||
285 | void __init init_extra_mapping_wb(unsigned long phys, unsigned long size) | |
286 | { | |
2df58b6d | 287 | __init_extra_mapping(phys, size, _PAGE_CACHE_MODE_WB); |
3a9e189d JS |
288 | } |
289 | ||
290 | void __init init_extra_mapping_uc(unsigned long phys, unsigned long size) | |
291 | { | |
2df58b6d | 292 | __init_extra_mapping(phys, size, _PAGE_CACHE_MODE_UC); |
3a9e189d JS |
293 | } |
294 | ||
31eedd82 | 295 | /* |
88f3aec7 IM |
296 | * The head.S code sets up the kernel high mapping: |
297 | * | |
298 | * from __START_KERNEL_map to __START_KERNEL_map + size (== _end-_text) | |
31eedd82 | 299 | * |
1e3b3081 | 300 | * phys_base holds the negative offset to the kernel, which is added |
31eedd82 TG |
301 | * to the compile time generated pmds. This results in invalid pmds up |
302 | * to the point where we hit the physaddr 0 mapping. | |
303 | * | |
e5f15b45 YL |
304 | * We limit the mappings to the region from _text to _brk_end. _brk_end |
305 | * is rounded up to the 2MB boundary. This catches the invalid pmds as | |
31eedd82 TG |
306 | * well, as they are located before _text: |
307 | */ | |
308 | void __init cleanup_highmap(void) | |
309 | { | |
310 | unsigned long vaddr = __START_KERNEL_map; | |
10054230 | 311 | unsigned long vaddr_end = __START_KERNEL_map + KERNEL_IMAGE_SIZE; |
e5f15b45 | 312 | unsigned long end = roundup((unsigned long)_brk_end, PMD_SIZE) - 1; |
31eedd82 | 313 | pmd_t *pmd = level2_kernel_pgt; |
31eedd82 | 314 | |
10054230 YL |
315 | /* |
316 | * Native path, max_pfn_mapped is not set yet. | |
317 | * Xen has valid max_pfn_mapped set in | |
318 | * arch/x86/xen/mmu.c:xen_setup_kernel_pagetable(). | |
319 | */ | |
320 | if (max_pfn_mapped) | |
321 | vaddr_end = __START_KERNEL_map + (max_pfn_mapped << PAGE_SHIFT); | |
322 | ||
e5f15b45 | 323 | for (; vaddr + PMD_SIZE - 1 < vaddr_end; pmd++, vaddr += PMD_SIZE) { |
2884f110 | 324 | if (pmd_none(*pmd)) |
31eedd82 TG |
325 | continue; |
326 | if (vaddr < (unsigned long) _text || vaddr > end) | |
327 | set_pmd(pmd, __pmd(0)); | |
328 | } | |
329 | } | |
330 | ||
7b16eb89 | 331 | static unsigned long __meminit |
b27a43c1 SS |
332 | phys_pte_init(pte_t *pte_page, unsigned long addr, unsigned long end, |
333 | pgprot_t prot) | |
4f9c11dd | 334 | { |
eceb3632 | 335 | unsigned long pages = 0, next; |
7b16eb89 | 336 | unsigned long last_map_addr = end; |
4f9c11dd | 337 | int i; |
7b16eb89 | 338 | |
4f9c11dd JF |
339 | pte_t *pte = pte_page + pte_index(addr); |
340 | ||
eceb3632 YL |
341 | for (i = pte_index(addr); i < PTRS_PER_PTE; i++, addr = next, pte++) { |
342 | next = (addr & PAGE_MASK) + PAGE_SIZE; | |
4f9c11dd | 343 | if (addr >= end) { |
eceb3632 YL |
344 | if (!after_bootmem && |
345 | !e820_any_mapped(addr & PAGE_MASK, next, E820_RAM) && | |
346 | !e820_any_mapped(addr & PAGE_MASK, next, E820_RESERVED_KERN)) | |
347 | set_pte(pte, __pte(0)); | |
348 | continue; | |
4f9c11dd JF |
349 | } |
350 | ||
b27a43c1 SS |
351 | /* |
352 | * We will re-use the existing mapping. | |
353 | * Xen for example has some special requirements, like mapping | |
354 | * pagetable pages as RO. So assume someone who pre-setup | |
355 | * these mappings are more intelligent. | |
356 | */ | |
dcb32d99 | 357 | if (!pte_none(*pte)) { |
876ee61a JB |
358 | if (!after_bootmem) |
359 | pages++; | |
4f9c11dd | 360 | continue; |
3afa3949 | 361 | } |
4f9c11dd JF |
362 | |
363 | if (0) | |
364 | printk(" pte=%p addr=%lx pte=%016lx\n", | |
365 | pte, addr, pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL).pte); | |
4f9c11dd | 366 | pages++; |
b27a43c1 | 367 | set_pte(pte, pfn_pte(addr >> PAGE_SHIFT, prot)); |
7b16eb89 | 368 | last_map_addr = (addr & PAGE_MASK) + PAGE_SIZE; |
4f9c11dd | 369 | } |
a2699e47 | 370 | |
4f9c11dd | 371 | update_page_count(PG_LEVEL_4K, pages); |
7b16eb89 YL |
372 | |
373 | return last_map_addr; | |
4f9c11dd JF |
374 | } |
375 | ||
cc615032 | 376 | static unsigned long __meminit |
b50efd2a | 377 | phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end, |
b27a43c1 | 378 | unsigned long page_size_mask, pgprot_t prot) |
44df75e6 | 379 | { |
20167d34 | 380 | unsigned long pages = 0, next; |
7b16eb89 | 381 | unsigned long last_map_addr = end; |
ce0c0e50 | 382 | |
6ad91658 | 383 | int i = pmd_index(address); |
44df75e6 | 384 | |
20167d34 | 385 | for (; i < PTRS_PER_PMD; i++, address = next) { |
6ad91658 | 386 | pmd_t *pmd = pmd_page + pmd_index(address); |
4f9c11dd | 387 | pte_t *pte; |
b27a43c1 | 388 | pgprot_t new_prot = prot; |
44df75e6 | 389 | |
eceb3632 | 390 | next = (address & PMD_MASK) + PMD_SIZE; |
5f51e139 | 391 | if (address >= end) { |
eceb3632 YL |
392 | if (!after_bootmem && |
393 | !e820_any_mapped(address & PMD_MASK, next, E820_RAM) && | |
394 | !e820_any_mapped(address & PMD_MASK, next, E820_RESERVED_KERN)) | |
395 | set_pmd(pmd, __pmd(0)); | |
396 | continue; | |
44df75e6 | 397 | } |
6ad91658 | 398 | |
dcb32d99 | 399 | if (!pmd_none(*pmd)) { |
8ae3a5a8 JB |
400 | if (!pmd_large(*pmd)) { |
401 | spin_lock(&init_mm.page_table_lock); | |
973dc4f3 | 402 | pte = (pte_t *)pmd_page_vaddr(*pmd); |
4b239f45 | 403 | last_map_addr = phys_pte_init(pte, address, |
b27a43c1 | 404 | end, prot); |
8ae3a5a8 | 405 | spin_unlock(&init_mm.page_table_lock); |
a2699e47 | 406 | continue; |
8ae3a5a8 | 407 | } |
b27a43c1 SS |
408 | /* |
409 | * If we are ok with PG_LEVEL_2M mapping, then we will | |
410 | * use the existing mapping, | |
411 | * | |
412 | * Otherwise, we will split the large page mapping but | |
413 | * use the same existing protection bits except for | |
414 | * large page, so that we don't violate Intel's TLB | |
415 | * Application note (317080) which says, while changing | |
416 | * the page sizes, new and old translations should | |
417 | * not differ with respect to page frame and | |
418 | * attributes. | |
419 | */ | |
3afa3949 | 420 | if (page_size_mask & (1 << PG_LEVEL_2M)) { |
876ee61a JB |
421 | if (!after_bootmem) |
422 | pages++; | |
20167d34 | 423 | last_map_addr = next; |
b27a43c1 | 424 | continue; |
3afa3949 | 425 | } |
b27a43c1 | 426 | new_prot = pte_pgprot(pte_clrhuge(*(pte_t *)pmd)); |
4f9c11dd JF |
427 | } |
428 | ||
b50efd2a | 429 | if (page_size_mask & (1<<PG_LEVEL_2M)) { |
4f9c11dd | 430 | pages++; |
8ae3a5a8 | 431 | spin_lock(&init_mm.page_table_lock); |
4f9c11dd | 432 | set_pte((pte_t *)pmd, |
960ddb4f | 433 | pfn_pte((address & PMD_MASK) >> PAGE_SHIFT, |
b27a43c1 | 434 | __pgprot(pgprot_val(prot) | _PAGE_PSE))); |
8ae3a5a8 | 435 | spin_unlock(&init_mm.page_table_lock); |
20167d34 | 436 | last_map_addr = next; |
6ad91658 | 437 | continue; |
4f9c11dd | 438 | } |
6ad91658 | 439 | |
868bf4d6 | 440 | pte = alloc_low_page(); |
b27a43c1 | 441 | last_map_addr = phys_pte_init(pte, address, end, new_prot); |
4f9c11dd | 442 | |
8ae3a5a8 | 443 | spin_lock(&init_mm.page_table_lock); |
868bf4d6 | 444 | pmd_populate_kernel(&init_mm, pmd, pte); |
8ae3a5a8 | 445 | spin_unlock(&init_mm.page_table_lock); |
44df75e6 | 446 | } |
ce0c0e50 | 447 | update_page_count(PG_LEVEL_2M, pages); |
7b16eb89 | 448 | return last_map_addr; |
44df75e6 MT |
449 | } |
450 | ||
cc615032 | 451 | static unsigned long __meminit |
b50efd2a YL |
452 | phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end, |
453 | unsigned long page_size_mask) | |
14a62c34 | 454 | { |
20167d34 | 455 | unsigned long pages = 0, next; |
cc615032 | 456 | unsigned long last_map_addr = end; |
6ad91658 | 457 | int i = pud_index(addr); |
44df75e6 | 458 | |
20167d34 | 459 | for (; i < PTRS_PER_PUD; i++, addr = next) { |
6ad91658 | 460 | pud_t *pud = pud_page + pud_index(addr); |
1da177e4 | 461 | pmd_t *pmd; |
b27a43c1 | 462 | pgprot_t prot = PAGE_KERNEL; |
1da177e4 | 463 | |
20167d34 | 464 | next = (addr & PUD_MASK) + PUD_SIZE; |
eceb3632 YL |
465 | if (addr >= end) { |
466 | if (!after_bootmem && | |
467 | !e820_any_mapped(addr & PUD_MASK, next, E820_RAM) && | |
468 | !e820_any_mapped(addr & PUD_MASK, next, E820_RESERVED_KERN)) | |
469 | set_pud(pud, __pud(0)); | |
1da177e4 | 470 | continue; |
14a62c34 | 471 | } |
1da177e4 | 472 | |
dcb32d99 | 473 | if (!pud_none(*pud)) { |
a2699e47 | 474 | if (!pud_large(*pud)) { |
973dc4f3 | 475 | pmd = pmd_offset(pud, 0); |
4b239f45 | 476 | last_map_addr = phys_pmd_init(pmd, addr, end, |
b27a43c1 | 477 | page_size_mask, prot); |
4b239f45 | 478 | __flush_tlb_all(); |
a2699e47 SS |
479 | continue; |
480 | } | |
b27a43c1 SS |
481 | /* |
482 | * If we are ok with PG_LEVEL_1G mapping, then we will | |
483 | * use the existing mapping. | |
484 | * | |
485 | * Otherwise, we will split the gbpage mapping but use | |
486 | * the same existing protection bits except for large | |
487 | * page, so that we don't violate Intel's TLB | |
488 | * Application note (317080) which says, while changing | |
489 | * the page sizes, new and old translations should | |
490 | * not differ with respect to page frame and | |
491 | * attributes. | |
492 | */ | |
3afa3949 | 493 | if (page_size_mask & (1 << PG_LEVEL_1G)) { |
876ee61a JB |
494 | if (!after_bootmem) |
495 | pages++; | |
20167d34 | 496 | last_map_addr = next; |
b27a43c1 | 497 | continue; |
3afa3949 | 498 | } |
b27a43c1 | 499 | prot = pte_pgprot(pte_clrhuge(*(pte_t *)pud)); |
ef925766 AK |
500 | } |
501 | ||
b50efd2a | 502 | if (page_size_mask & (1<<PG_LEVEL_1G)) { |
ce0c0e50 | 503 | pages++; |
8ae3a5a8 | 504 | spin_lock(&init_mm.page_table_lock); |
ef925766 | 505 | set_pte((pte_t *)pud, |
960ddb4f YL |
506 | pfn_pte((addr & PUD_MASK) >> PAGE_SHIFT, |
507 | PAGE_KERNEL_LARGE)); | |
8ae3a5a8 | 508 | spin_unlock(&init_mm.page_table_lock); |
20167d34 | 509 | last_map_addr = next; |
6ad91658 KM |
510 | continue; |
511 | } | |
512 | ||
868bf4d6 | 513 | pmd = alloc_low_page(); |
b27a43c1 SS |
514 | last_map_addr = phys_pmd_init(pmd, addr, end, page_size_mask, |
515 | prot); | |
8ae3a5a8 JB |
516 | |
517 | spin_lock(&init_mm.page_table_lock); | |
868bf4d6 | 518 | pud_populate(&init_mm, pud, pmd); |
44df75e6 | 519 | spin_unlock(&init_mm.page_table_lock); |
1da177e4 | 520 | } |
1a2b4412 | 521 | __flush_tlb_all(); |
a2699e47 | 522 | |
ce0c0e50 | 523 | update_page_count(PG_LEVEL_1G, pages); |
cc615032 | 524 | |
1a0db38e | 525 | return last_map_addr; |
14a62c34 | 526 | } |
1da177e4 | 527 | |
41d840e2 | 528 | unsigned long __meminit |
f765090a PE |
529 | kernel_physical_mapping_init(unsigned long start, |
530 | unsigned long end, | |
531 | unsigned long page_size_mask) | |
14a62c34 | 532 | { |
9b861528 | 533 | bool pgd_changed = false; |
b50efd2a | 534 | unsigned long next, last_map_addr = end; |
9b861528 | 535 | unsigned long addr; |
1da177e4 LT |
536 | |
537 | start = (unsigned long)__va(start); | |
538 | end = (unsigned long)__va(end); | |
1c5f50ee | 539 | addr = start; |
1da177e4 LT |
540 | |
541 | for (; start < end; start = next) { | |
44df75e6 MT |
542 | pgd_t *pgd = pgd_offset_k(start); |
543 | pud_t *pud; | |
544 | ||
c2bdee59 | 545 | next = (start & PGDIR_MASK) + PGDIR_SIZE; |
4f9c11dd JF |
546 | |
547 | if (pgd_val(*pgd)) { | |
973dc4f3 | 548 | pud = (pud_t *)pgd_page_vaddr(*pgd); |
4b239f45 | 549 | last_map_addr = phys_pud_init(pud, __pa(start), |
b50efd2a | 550 | __pa(end), page_size_mask); |
4f9c11dd JF |
551 | continue; |
552 | } | |
553 | ||
868bf4d6 | 554 | pud = alloc_low_page(); |
c2bdee59 | 555 | last_map_addr = phys_pud_init(pud, __pa(start), __pa(end), |
b50efd2a | 556 | page_size_mask); |
8ae3a5a8 JB |
557 | |
558 | spin_lock(&init_mm.page_table_lock); | |
868bf4d6 | 559 | pgd_populate(&init_mm, pgd, pud); |
8ae3a5a8 | 560 | spin_unlock(&init_mm.page_table_lock); |
9b861528 | 561 | pgd_changed = true; |
14a62c34 | 562 | } |
9b861528 HL |
563 | |
564 | if (pgd_changed) | |
9661d5bc | 565 | sync_global_pgds(addr, end - 1, 0); |
9b861528 | 566 | |
a2699e47 | 567 | __flush_tlb_all(); |
1da177e4 | 568 | |
b50efd2a YL |
569 | return last_map_addr; |
570 | } | |
7b16eb89 | 571 | |
2b97690f | 572 | #ifndef CONFIG_NUMA |
d8fc3afc | 573 | void __init initmem_init(void) |
1f75d7e3 | 574 | { |
e7e8de59 | 575 | memblock_set_node(0, (phys_addr_t)ULLONG_MAX, &memblock.memory, 0); |
1f75d7e3 | 576 | } |
3551f88f | 577 | #endif |
1f75d7e3 | 578 | |
1da177e4 LT |
579 | void __init paging_init(void) |
580 | { | |
3551f88f | 581 | sparse_memory_present_with_active_regions(MAX_NUMNODES); |
44df75e6 | 582 | sparse_init(); |
44b57280 YL |
583 | |
584 | /* | |
585 | * clear the default setting with node 0 | |
586 | * note: don't use nodes_clear here, that is really clearing when | |
587 | * numa support is not compiled in, and later node_set_state | |
588 | * will not set it back. | |
589 | */ | |
4b0ef1fe LJ |
590 | node_clear_state(0, N_MEMORY); |
591 | if (N_MEMORY != N_NORMAL_MEMORY) | |
592 | node_clear_state(0, N_NORMAL_MEMORY); | |
44b57280 | 593 | |
4c0b2e5f | 594 | zone_sizes_init(); |
1da177e4 | 595 | } |
1da177e4 | 596 | |
44df75e6 MT |
597 | /* |
598 | * Memory hotplug specific functions | |
44df75e6 | 599 | */ |
bc02af93 | 600 | #ifdef CONFIG_MEMORY_HOTPLUG |
ea085417 SZ |
601 | /* |
602 | * After memory hotplug the variables max_pfn, max_low_pfn and high_memory need | |
603 | * updating. | |
604 | */ | |
605 | static void update_end_of_memory_vars(u64 start, u64 size) | |
606 | { | |
607 | unsigned long end_pfn = PFN_UP(start + size); | |
608 | ||
609 | if (end_pfn > max_pfn) { | |
610 | max_pfn = end_pfn; | |
611 | max_low_pfn = end_pfn; | |
612 | high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1; | |
613 | } | |
614 | } | |
615 | ||
9d99aaa3 AK |
616 | /* |
617 | * Memory is added always to NORMAL zone. This means you will never get | |
618 | * additional DMA/DMA32 memory. | |
619 | */ | |
033fbae9 | 620 | int arch_add_memory(int nid, u64 start, u64 size, bool for_device) |
44df75e6 | 621 | { |
bc02af93 | 622 | struct pglist_data *pgdat = NODE_DATA(nid); |
9bfc4113 | 623 | struct zone *zone = pgdat->node_zones + |
033fbae9 | 624 | zone_for_memory(nid, start, size, ZONE_NORMAL, for_device); |
66520ebc | 625 | unsigned long start_pfn = start >> PAGE_SHIFT; |
44df75e6 MT |
626 | unsigned long nr_pages = size >> PAGE_SHIFT; |
627 | int ret; | |
628 | ||
66520ebc | 629 | init_memory_mapping(start, start + size); |
45e0b78b | 630 | |
c04fc586 | 631 | ret = __add_pages(nid, zone, start_pfn, nr_pages); |
fe8b868e | 632 | WARN_ON_ONCE(ret); |
44df75e6 | 633 | |
ea085417 SZ |
634 | /* update max_pfn, max_low_pfn and high_memory */ |
635 | update_end_of_memory_vars(start, size); | |
636 | ||
44df75e6 | 637 | return ret; |
44df75e6 | 638 | } |
bc02af93 | 639 | EXPORT_SYMBOL_GPL(arch_add_memory); |
44df75e6 | 640 | |
ae9aae9e WC |
641 | #define PAGE_INUSE 0xFD |
642 | ||
643 | static void __meminit free_pagetable(struct page *page, int order) | |
644 | { | |
ae9aae9e WC |
645 | unsigned long magic; |
646 | unsigned int nr_pages = 1 << order; | |
4b94ffdc DW |
647 | struct vmem_altmap *altmap = to_vmem_altmap((unsigned long) page); |
648 | ||
649 | if (altmap) { | |
650 | vmem_altmap_free(altmap, nr_pages); | |
651 | return; | |
652 | } | |
ae9aae9e WC |
653 | |
654 | /* bootmem page has reserved flag */ | |
655 | if (PageReserved(page)) { | |
656 | __ClearPageReserved(page); | |
ae9aae9e WC |
657 | |
658 | magic = (unsigned long)page->lru.next; | |
659 | if (magic == SECTION_INFO || magic == MIX_SECTION_INFO) { | |
660 | while (nr_pages--) | |
661 | put_page_bootmem(page++); | |
662 | } else | |
170a5a7e JL |
663 | while (nr_pages--) |
664 | free_reserved_page(page++); | |
ae9aae9e WC |
665 | } else |
666 | free_pages((unsigned long)page_address(page), order); | |
ae9aae9e WC |
667 | } |
668 | ||
669 | static void __meminit free_pte_table(pte_t *pte_start, pmd_t *pmd) | |
670 | { | |
671 | pte_t *pte; | |
672 | int i; | |
673 | ||
674 | for (i = 0; i < PTRS_PER_PTE; i++) { | |
675 | pte = pte_start + i; | |
dcb32d99 | 676 | if (!pte_none(*pte)) |
ae9aae9e WC |
677 | return; |
678 | } | |
679 | ||
680 | /* free a pte talbe */ | |
681 | free_pagetable(pmd_page(*pmd), 0); | |
682 | spin_lock(&init_mm.page_table_lock); | |
683 | pmd_clear(pmd); | |
684 | spin_unlock(&init_mm.page_table_lock); | |
685 | } | |
686 | ||
687 | static void __meminit free_pmd_table(pmd_t *pmd_start, pud_t *pud) | |
688 | { | |
689 | pmd_t *pmd; | |
690 | int i; | |
691 | ||
692 | for (i = 0; i < PTRS_PER_PMD; i++) { | |
693 | pmd = pmd_start + i; | |
dcb32d99 | 694 | if (!pmd_none(*pmd)) |
ae9aae9e WC |
695 | return; |
696 | } | |
697 | ||
698 | /* free a pmd talbe */ | |
699 | free_pagetable(pud_page(*pud), 0); | |
700 | spin_lock(&init_mm.page_table_lock); | |
701 | pud_clear(pud); | |
702 | spin_unlock(&init_mm.page_table_lock); | |
703 | } | |
704 | ||
705 | /* Return true if pgd is changed, otherwise return false. */ | |
706 | static bool __meminit free_pud_table(pud_t *pud_start, pgd_t *pgd) | |
707 | { | |
708 | pud_t *pud; | |
709 | int i; | |
710 | ||
711 | for (i = 0; i < PTRS_PER_PUD; i++) { | |
712 | pud = pud_start + i; | |
dcb32d99 | 713 | if (!pud_none(*pud)) |
ae9aae9e WC |
714 | return false; |
715 | } | |
716 | ||
717 | /* free a pud table */ | |
718 | free_pagetable(pgd_page(*pgd), 0); | |
719 | spin_lock(&init_mm.page_table_lock); | |
720 | pgd_clear(pgd); | |
721 | spin_unlock(&init_mm.page_table_lock); | |
722 | ||
723 | return true; | |
724 | } | |
725 | ||
726 | static void __meminit | |
727 | remove_pte_table(pte_t *pte_start, unsigned long addr, unsigned long end, | |
728 | bool direct) | |
729 | { | |
730 | unsigned long next, pages = 0; | |
731 | pte_t *pte; | |
732 | void *page_addr; | |
733 | phys_addr_t phys_addr; | |
734 | ||
735 | pte = pte_start + pte_index(addr); | |
736 | for (; addr < end; addr = next, pte++) { | |
737 | next = (addr + PAGE_SIZE) & PAGE_MASK; | |
738 | if (next > end) | |
739 | next = end; | |
740 | ||
741 | if (!pte_present(*pte)) | |
742 | continue; | |
743 | ||
744 | /* | |
745 | * We mapped [0,1G) memory as identity mapping when | |
746 | * initializing, in arch/x86/kernel/head_64.S. These | |
747 | * pagetables cannot be removed. | |
748 | */ | |
749 | phys_addr = pte_val(*pte) + (addr & PAGE_MASK); | |
750 | if (phys_addr < (phys_addr_t)0x40000000) | |
751 | return; | |
752 | ||
b500f77b | 753 | if (PAGE_ALIGNED(addr) && PAGE_ALIGNED(next)) { |
ae9aae9e WC |
754 | /* |
755 | * Do not free direct mapping pages since they were | |
756 | * freed when offlining, or simplely not in use. | |
757 | */ | |
758 | if (!direct) | |
759 | free_pagetable(pte_page(*pte), 0); | |
760 | ||
761 | spin_lock(&init_mm.page_table_lock); | |
762 | pte_clear(&init_mm, addr, pte); | |
763 | spin_unlock(&init_mm.page_table_lock); | |
764 | ||
765 | /* For non-direct mapping, pages means nothing. */ | |
766 | pages++; | |
767 | } else { | |
768 | /* | |
769 | * If we are here, we are freeing vmemmap pages since | |
770 | * direct mapped memory ranges to be freed are aligned. | |
771 | * | |
772 | * If we are not removing the whole page, it means | |
773 | * other page structs in this page are being used and | |
774 | * we canot remove them. So fill the unused page_structs | |
775 | * with 0xFD, and remove the page when it is wholly | |
776 | * filled with 0xFD. | |
777 | */ | |
778 | memset((void *)addr, PAGE_INUSE, next - addr); | |
779 | ||
780 | page_addr = page_address(pte_page(*pte)); | |
781 | if (!memchr_inv(page_addr, PAGE_INUSE, PAGE_SIZE)) { | |
782 | free_pagetable(pte_page(*pte), 0); | |
783 | ||
784 | spin_lock(&init_mm.page_table_lock); | |
785 | pte_clear(&init_mm, addr, pte); | |
786 | spin_unlock(&init_mm.page_table_lock); | |
787 | } | |
788 | } | |
789 | } | |
790 | ||
791 | /* Call free_pte_table() in remove_pmd_table(). */ | |
792 | flush_tlb_all(); | |
793 | if (direct) | |
794 | update_page_count(PG_LEVEL_4K, -pages); | |
795 | } | |
796 | ||
797 | static void __meminit | |
798 | remove_pmd_table(pmd_t *pmd_start, unsigned long addr, unsigned long end, | |
799 | bool direct) | |
800 | { | |
801 | unsigned long next, pages = 0; | |
802 | pte_t *pte_base; | |
803 | pmd_t *pmd; | |
804 | void *page_addr; | |
805 | ||
806 | pmd = pmd_start + pmd_index(addr); | |
807 | for (; addr < end; addr = next, pmd++) { | |
808 | next = pmd_addr_end(addr, end); | |
809 | ||
810 | if (!pmd_present(*pmd)) | |
811 | continue; | |
812 | ||
813 | if (pmd_large(*pmd)) { | |
814 | if (IS_ALIGNED(addr, PMD_SIZE) && | |
815 | IS_ALIGNED(next, PMD_SIZE)) { | |
816 | if (!direct) | |
817 | free_pagetable(pmd_page(*pmd), | |
818 | get_order(PMD_SIZE)); | |
819 | ||
820 | spin_lock(&init_mm.page_table_lock); | |
821 | pmd_clear(pmd); | |
822 | spin_unlock(&init_mm.page_table_lock); | |
823 | pages++; | |
824 | } else { | |
825 | /* If here, we are freeing vmemmap pages. */ | |
826 | memset((void *)addr, PAGE_INUSE, next - addr); | |
827 | ||
828 | page_addr = page_address(pmd_page(*pmd)); | |
829 | if (!memchr_inv(page_addr, PAGE_INUSE, | |
830 | PMD_SIZE)) { | |
831 | free_pagetable(pmd_page(*pmd), | |
832 | get_order(PMD_SIZE)); | |
833 | ||
834 | spin_lock(&init_mm.page_table_lock); | |
835 | pmd_clear(pmd); | |
836 | spin_unlock(&init_mm.page_table_lock); | |
837 | } | |
838 | } | |
839 | ||
840 | continue; | |
841 | } | |
842 | ||
843 | pte_base = (pte_t *)pmd_page_vaddr(*pmd); | |
844 | remove_pte_table(pte_base, addr, next, direct); | |
845 | free_pte_table(pte_base, pmd); | |
846 | } | |
847 | ||
848 | /* Call free_pmd_table() in remove_pud_table(). */ | |
849 | if (direct) | |
850 | update_page_count(PG_LEVEL_2M, -pages); | |
851 | } | |
852 | ||
853 | static void __meminit | |
854 | remove_pud_table(pud_t *pud_start, unsigned long addr, unsigned long end, | |
855 | bool direct) | |
856 | { | |
857 | unsigned long next, pages = 0; | |
858 | pmd_t *pmd_base; | |
859 | pud_t *pud; | |
860 | void *page_addr; | |
861 | ||
862 | pud = pud_start + pud_index(addr); | |
863 | for (; addr < end; addr = next, pud++) { | |
864 | next = pud_addr_end(addr, end); | |
865 | ||
866 | if (!pud_present(*pud)) | |
867 | continue; | |
868 | ||
869 | if (pud_large(*pud)) { | |
870 | if (IS_ALIGNED(addr, PUD_SIZE) && | |
871 | IS_ALIGNED(next, PUD_SIZE)) { | |
872 | if (!direct) | |
873 | free_pagetable(pud_page(*pud), | |
874 | get_order(PUD_SIZE)); | |
875 | ||
876 | spin_lock(&init_mm.page_table_lock); | |
877 | pud_clear(pud); | |
878 | spin_unlock(&init_mm.page_table_lock); | |
879 | pages++; | |
880 | } else { | |
881 | /* If here, we are freeing vmemmap pages. */ | |
882 | memset((void *)addr, PAGE_INUSE, next - addr); | |
883 | ||
884 | page_addr = page_address(pud_page(*pud)); | |
885 | if (!memchr_inv(page_addr, PAGE_INUSE, | |
886 | PUD_SIZE)) { | |
887 | free_pagetable(pud_page(*pud), | |
888 | get_order(PUD_SIZE)); | |
889 | ||
890 | spin_lock(&init_mm.page_table_lock); | |
891 | pud_clear(pud); | |
892 | spin_unlock(&init_mm.page_table_lock); | |
893 | } | |
894 | } | |
895 | ||
896 | continue; | |
897 | } | |
898 | ||
899 | pmd_base = (pmd_t *)pud_page_vaddr(*pud); | |
900 | remove_pmd_table(pmd_base, addr, next, direct); | |
901 | free_pmd_table(pmd_base, pud); | |
902 | } | |
903 | ||
904 | if (direct) | |
905 | update_page_count(PG_LEVEL_1G, -pages); | |
906 | } | |
907 | ||
908 | /* start and end are both virtual address. */ | |
909 | static void __meminit | |
910 | remove_pagetable(unsigned long start, unsigned long end, bool direct) | |
911 | { | |
912 | unsigned long next; | |
5255e0a7 | 913 | unsigned long addr; |
ae9aae9e WC |
914 | pgd_t *pgd; |
915 | pud_t *pud; | |
916 | bool pgd_changed = false; | |
917 | ||
5255e0a7 YI |
918 | for (addr = start; addr < end; addr = next) { |
919 | next = pgd_addr_end(addr, end); | |
ae9aae9e | 920 | |
5255e0a7 | 921 | pgd = pgd_offset_k(addr); |
ae9aae9e WC |
922 | if (!pgd_present(*pgd)) |
923 | continue; | |
924 | ||
925 | pud = (pud_t *)pgd_page_vaddr(*pgd); | |
5255e0a7 | 926 | remove_pud_table(pud, addr, next, direct); |
ae9aae9e WC |
927 | if (free_pud_table(pud, pgd)) |
928 | pgd_changed = true; | |
929 | } | |
930 | ||
931 | if (pgd_changed) | |
9661d5bc | 932 | sync_global_pgds(start, end - 1, 1); |
ae9aae9e WC |
933 | |
934 | flush_tlb_all(); | |
935 | } | |
936 | ||
0aad818b | 937 | void __ref vmemmap_free(unsigned long start, unsigned long end) |
0197518c | 938 | { |
0197518c TC |
939 | remove_pagetable(start, end, false); |
940 | } | |
941 | ||
587ff8c4 | 942 | #ifdef CONFIG_MEMORY_HOTREMOVE |
bbcab878 TC |
943 | static void __meminit |
944 | kernel_physical_mapping_remove(unsigned long start, unsigned long end) | |
945 | { | |
946 | start = (unsigned long)__va(start); | |
947 | end = (unsigned long)__va(end); | |
948 | ||
949 | remove_pagetable(start, end, true); | |
950 | } | |
951 | ||
24d335ca WC |
952 | int __ref arch_remove_memory(u64 start, u64 size) |
953 | { | |
954 | unsigned long start_pfn = start >> PAGE_SHIFT; | |
955 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
4b94ffdc DW |
956 | struct page *page = pfn_to_page(start_pfn); |
957 | struct vmem_altmap *altmap; | |
24d335ca WC |
958 | struct zone *zone; |
959 | int ret; | |
960 | ||
4b94ffdc DW |
961 | /* With altmap the first mapped page is offset from @start */ |
962 | altmap = to_vmem_altmap((unsigned long) page); | |
963 | if (altmap) | |
964 | page += vmem_altmap_offset(altmap); | |
965 | zone = page_zone(page); | |
24d335ca WC |
966 | ret = __remove_pages(zone, start_pfn, nr_pages); |
967 | WARN_ON_ONCE(ret); | |
4b94ffdc | 968 | kernel_physical_mapping_remove(start, start + size); |
24d335ca WC |
969 | |
970 | return ret; | |
971 | } | |
972 | #endif | |
45e0b78b KM |
973 | #endif /* CONFIG_MEMORY_HOTPLUG */ |
974 | ||
81ac3ad9 | 975 | static struct kcore_list kcore_vsyscall; |
1da177e4 | 976 | |
94b43c3d YL |
977 | static void __init register_page_bootmem_info(void) |
978 | { | |
979 | #ifdef CONFIG_NUMA | |
980 | int i; | |
981 | ||
982 | for_each_online_node(i) | |
983 | register_page_bootmem_info_node(NODE_DATA(i)); | |
984 | #endif | |
985 | } | |
986 | ||
1da177e4 LT |
987 | void __init mem_init(void) |
988 | { | |
0dc243ae | 989 | pci_iommu_alloc(); |
1da177e4 | 990 | |
48ddb154 | 991 | /* clear_bss() already clear the empty_zero_page */ |
1da177e4 | 992 | |
94b43c3d | 993 | register_page_bootmem_info(); |
bced0e32 JL |
994 | |
995 | /* this will put all memory onto the freelists */ | |
0c988534 | 996 | free_all_bootmem(); |
1da177e4 LT |
997 | after_bootmem = 1; |
998 | ||
1da177e4 | 999 | /* Register memory areas for /proc/kcore */ |
f40c3300 AL |
1000 | kclist_add(&kcore_vsyscall, (void *)VSYSCALL_ADDR, |
1001 | PAGE_SIZE, KCORE_OTHER); | |
1da177e4 | 1002 | |
46a84132 | 1003 | mem_init_print_info(NULL); |
1da177e4 LT |
1004 | } |
1005 | ||
edeed305 AV |
1006 | const int rodata_test_data = 0xC3; |
1007 | EXPORT_SYMBOL_GPL(rodata_test_data); | |
67df197b | 1008 | |
502f6604 | 1009 | int kernel_set_to_readonly; |
16239630 SR |
1010 | |
1011 | void set_kernel_text_rw(void) | |
1012 | { | |
b9af7c0d | 1013 | unsigned long start = PFN_ALIGN(_text); |
e7d23dde | 1014 | unsigned long end = PFN_ALIGN(__stop___ex_table); |
16239630 SR |
1015 | |
1016 | if (!kernel_set_to_readonly) | |
1017 | return; | |
1018 | ||
1019 | pr_debug("Set kernel text: %lx - %lx for read write\n", | |
1020 | start, end); | |
1021 | ||
e7d23dde SS |
1022 | /* |
1023 | * Make the kernel identity mapping for text RW. Kernel text | |
1024 | * mapping will always be RO. Refer to the comment in | |
1025 | * static_protections() in pageattr.c | |
1026 | */ | |
16239630 SR |
1027 | set_memory_rw(start, (end - start) >> PAGE_SHIFT); |
1028 | } | |
1029 | ||
1030 | void set_kernel_text_ro(void) | |
1031 | { | |
b9af7c0d | 1032 | unsigned long start = PFN_ALIGN(_text); |
e7d23dde | 1033 | unsigned long end = PFN_ALIGN(__stop___ex_table); |
16239630 SR |
1034 | |
1035 | if (!kernel_set_to_readonly) | |
1036 | return; | |
1037 | ||
1038 | pr_debug("Set kernel text: %lx - %lx for read only\n", | |
1039 | start, end); | |
1040 | ||
e7d23dde SS |
1041 | /* |
1042 | * Set the kernel identity mapping for text RO. | |
1043 | */ | |
16239630 SR |
1044 | set_memory_ro(start, (end - start) >> PAGE_SHIFT); |
1045 | } | |
1046 | ||
67df197b AV |
1047 | void mark_rodata_ro(void) |
1048 | { | |
74e08179 | 1049 | unsigned long start = PFN_ALIGN(_text); |
fc8d7826 | 1050 | unsigned long rodata_start = PFN_ALIGN(__start_rodata); |
74e08179 | 1051 | unsigned long end = (unsigned long) &__end_rodata_hpage_align; |
fc8d7826 AD |
1052 | unsigned long text_end = PFN_ALIGN(&__stop___ex_table); |
1053 | unsigned long rodata_end = PFN_ALIGN(&__end_rodata); | |
45e2a9d4 | 1054 | unsigned long all_end; |
8f0f996e | 1055 | |
6fb14755 | 1056 | printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n", |
e3ebadd9 | 1057 | (end - start) >> 10); |
984bb80d AV |
1058 | set_memory_ro(start, (end - start) >> PAGE_SHIFT); |
1059 | ||
16239630 SR |
1060 | kernel_set_to_readonly = 1; |
1061 | ||
984bb80d | 1062 | /* |
72212675 YL |
1063 | * The rodata/data/bss/brk section (but not the kernel text!) |
1064 | * should also be not-executable. | |
45e2a9d4 KC |
1065 | * |
1066 | * We align all_end to PMD_SIZE because the existing mapping | |
1067 | * is a full PMD. If we would align _brk_end to PAGE_SIZE we | |
1068 | * split the PMD and the reminder between _brk_end and the end | |
1069 | * of the PMD will remain mapped executable. | |
1070 | * | |
1071 | * Any PMD which was setup after the one which covers _brk_end | |
1072 | * has been zapped already via cleanup_highmem(). | |
984bb80d | 1073 | */ |
45e2a9d4 | 1074 | all_end = roundup((unsigned long)_brk_end, PMD_SIZE); |
ab76f7b4 | 1075 | set_memory_nx(text_end, (all_end - text_end) >> PAGE_SHIFT); |
67df197b | 1076 | |
1a487252 AV |
1077 | rodata_test(); |
1078 | ||
0c42f392 | 1079 | #ifdef CONFIG_CPA_DEBUG |
10f22dde | 1080 | printk(KERN_INFO "Testing CPA: undo %lx-%lx\n", start, end); |
6d238cc4 | 1081 | set_memory_rw(start, (end-start) >> PAGE_SHIFT); |
0c42f392 | 1082 | |
10f22dde | 1083 | printk(KERN_INFO "Testing CPA: again\n"); |
6d238cc4 | 1084 | set_memory_ro(start, (end-start) >> PAGE_SHIFT); |
0c42f392 | 1085 | #endif |
74e08179 | 1086 | |
c88442ec | 1087 | free_init_pages("unused kernel", |
fc8d7826 AD |
1088 | (unsigned long) __va(__pa_symbol(text_end)), |
1089 | (unsigned long) __va(__pa_symbol(rodata_start))); | |
c88442ec | 1090 | free_init_pages("unused kernel", |
fc8d7826 AD |
1091 | (unsigned long) __va(__pa_symbol(rodata_end)), |
1092 | (unsigned long) __va(__pa_symbol(_sdata))); | |
e1a58320 SS |
1093 | |
1094 | debug_checkwx(); | |
67df197b | 1095 | } |
4e4eee0e | 1096 | |
14a62c34 TG |
1097 | int kern_addr_valid(unsigned long addr) |
1098 | { | |
1da177e4 | 1099 | unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT; |
14a62c34 TG |
1100 | pgd_t *pgd; |
1101 | pud_t *pud; | |
1102 | pmd_t *pmd; | |
1103 | pte_t *pte; | |
1da177e4 LT |
1104 | |
1105 | if (above != 0 && above != -1UL) | |
14a62c34 TG |
1106 | return 0; |
1107 | ||
1da177e4 LT |
1108 | pgd = pgd_offset_k(addr); |
1109 | if (pgd_none(*pgd)) | |
1110 | return 0; | |
1111 | ||
1112 | pud = pud_offset(pgd, addr); | |
1113 | if (pud_none(*pud)) | |
14a62c34 | 1114 | return 0; |
1da177e4 | 1115 | |
0ee364eb MG |
1116 | if (pud_large(*pud)) |
1117 | return pfn_valid(pud_pfn(*pud)); | |
1118 | ||
1da177e4 LT |
1119 | pmd = pmd_offset(pud, addr); |
1120 | if (pmd_none(*pmd)) | |
1121 | return 0; | |
14a62c34 | 1122 | |
1da177e4 LT |
1123 | if (pmd_large(*pmd)) |
1124 | return pfn_valid(pmd_pfn(*pmd)); | |
1125 | ||
1126 | pte = pte_offset_kernel(pmd, addr); | |
1127 | if (pte_none(*pte)) | |
1128 | return 0; | |
14a62c34 | 1129 | |
1da177e4 LT |
1130 | return pfn_valid(pte_pfn(*pte)); |
1131 | } | |
1132 | ||
982792c7 | 1133 | static unsigned long probe_memory_block_size(void) |
1dc41aa6 | 1134 | { |
43c75f93 | 1135 | unsigned long bz = MIN_MEMORY_BLOCK_SIZE; |
982792c7 | 1136 | |
43c75f93 SJ |
1137 | /* if system is UV or has 64GB of RAM or more, use large blocks */ |
1138 | if (is_uv_system() || ((max_pfn << PAGE_SHIFT) >= (64UL << 30))) | |
1139 | bz = 2UL << 30; /* 2GB */ | |
982792c7 | 1140 | |
43c75f93 | 1141 | pr_info("x86/mm: Memory block size: %ldMB\n", bz >> 20); |
982792c7 YL |
1142 | |
1143 | return bz; | |
1144 | } | |
1145 | ||
1146 | static unsigned long memory_block_size_probed; | |
1147 | unsigned long memory_block_size_bytes(void) | |
1148 | { | |
1149 | if (!memory_block_size_probed) | |
1150 | memory_block_size_probed = probe_memory_block_size(); | |
1151 | ||
1152 | return memory_block_size_probed; | |
1153 | } | |
1154 | ||
0889eba5 CL |
1155 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
1156 | /* | |
1157 | * Initialise the sparsemem vmemmap using huge-pages at the PMD level. | |
1158 | */ | |
c2b91e2e YL |
1159 | static long __meminitdata addr_start, addr_end; |
1160 | static void __meminitdata *p_start, *p_end; | |
1161 | static int __meminitdata node_start; | |
1162 | ||
e8216da5 | 1163 | static int __meminit vmemmap_populate_hugepages(unsigned long start, |
4b94ffdc | 1164 | unsigned long end, int node, struct vmem_altmap *altmap) |
0889eba5 | 1165 | { |
0aad818b | 1166 | unsigned long addr; |
0889eba5 CL |
1167 | unsigned long next; |
1168 | pgd_t *pgd; | |
1169 | pud_t *pud; | |
1170 | pmd_t *pmd; | |
1171 | ||
0aad818b | 1172 | for (addr = start; addr < end; addr = next) { |
e8216da5 | 1173 | next = pmd_addr_end(addr, end); |
0889eba5 CL |
1174 | |
1175 | pgd = vmemmap_pgd_populate(addr, node); | |
1176 | if (!pgd) | |
1177 | return -ENOMEM; | |
14a62c34 | 1178 | |
0889eba5 CL |
1179 | pud = vmemmap_pud_populate(pgd, addr, node); |
1180 | if (!pud) | |
1181 | return -ENOMEM; | |
1182 | ||
e8216da5 JW |
1183 | pmd = pmd_offset(pud, addr); |
1184 | if (pmd_none(*pmd)) { | |
e8216da5 | 1185 | void *p; |
14a62c34 | 1186 | |
4b94ffdc | 1187 | p = __vmemmap_alloc_block_buf(PMD_SIZE, node, altmap); |
8e2cdbcb JW |
1188 | if (p) { |
1189 | pte_t entry; | |
1190 | ||
1191 | entry = pfn_pte(__pa(p) >> PAGE_SHIFT, | |
1192 | PAGE_KERNEL_LARGE); | |
1193 | set_pmd(pmd, __pmd(pte_val(entry))); | |
1194 | ||
1195 | /* check to see if we have contiguous blocks */ | |
1196 | if (p_end != p || node_start != node) { | |
1197 | if (p_start) | |
c9cdaeb2 | 1198 | pr_debug(" [%lx-%lx] PMD -> [%p-%p] on node %d\n", |
8e2cdbcb JW |
1199 | addr_start, addr_end-1, p_start, p_end-1, node_start); |
1200 | addr_start = addr; | |
1201 | node_start = node; | |
1202 | p_start = p; | |
1203 | } | |
7c934d39 | 1204 | |
8e2cdbcb JW |
1205 | addr_end = addr + PMD_SIZE; |
1206 | p_end = p + PMD_SIZE; | |
1207 | continue; | |
4b94ffdc DW |
1208 | } else if (altmap) |
1209 | return -ENOMEM; /* no fallback */ | |
8e2cdbcb | 1210 | } else if (pmd_large(*pmd)) { |
e8216da5 | 1211 | vmemmap_verify((pte_t *)pmd, node, addr, next); |
8e2cdbcb JW |
1212 | continue; |
1213 | } | |
1214 | pr_warn_once("vmemmap: falling back to regular page backing\n"); | |
1215 | if (vmemmap_populate_basepages(addr, next, node)) | |
1216 | return -ENOMEM; | |
0889eba5 | 1217 | } |
0889eba5 CL |
1218 | return 0; |
1219 | } | |
c2b91e2e | 1220 | |
e8216da5 JW |
1221 | int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node) |
1222 | { | |
4b94ffdc | 1223 | struct vmem_altmap *altmap = to_vmem_altmap(start); |
e8216da5 JW |
1224 | int err; |
1225 | ||
16bf9226 | 1226 | if (boot_cpu_has(X86_FEATURE_PSE)) |
4b94ffdc DW |
1227 | err = vmemmap_populate_hugepages(start, end, node, altmap); |
1228 | else if (altmap) { | |
1229 | pr_err_once("%s: no cpu support for altmap allocations\n", | |
1230 | __func__); | |
1231 | err = -ENOMEM; | |
1232 | } else | |
e8216da5 JW |
1233 | err = vmemmap_populate_basepages(start, end, node); |
1234 | if (!err) | |
9661d5bc | 1235 | sync_global_pgds(start, end - 1, 0); |
e8216da5 JW |
1236 | return err; |
1237 | } | |
1238 | ||
46723bfa YI |
1239 | #if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HAVE_BOOTMEM_INFO_NODE) |
1240 | void register_page_bootmem_memmap(unsigned long section_nr, | |
1241 | struct page *start_page, unsigned long size) | |
1242 | { | |
1243 | unsigned long addr = (unsigned long)start_page; | |
1244 | unsigned long end = (unsigned long)(start_page + size); | |
1245 | unsigned long next; | |
1246 | pgd_t *pgd; | |
1247 | pud_t *pud; | |
1248 | pmd_t *pmd; | |
1249 | unsigned int nr_pages; | |
1250 | struct page *page; | |
1251 | ||
1252 | for (; addr < end; addr = next) { | |
1253 | pte_t *pte = NULL; | |
1254 | ||
1255 | pgd = pgd_offset_k(addr); | |
1256 | if (pgd_none(*pgd)) { | |
1257 | next = (addr + PAGE_SIZE) & PAGE_MASK; | |
1258 | continue; | |
1259 | } | |
1260 | get_page_bootmem(section_nr, pgd_page(*pgd), MIX_SECTION_INFO); | |
1261 | ||
1262 | pud = pud_offset(pgd, addr); | |
1263 | if (pud_none(*pud)) { | |
1264 | next = (addr + PAGE_SIZE) & PAGE_MASK; | |
1265 | continue; | |
1266 | } | |
1267 | get_page_bootmem(section_nr, pud_page(*pud), MIX_SECTION_INFO); | |
1268 | ||
16bf9226 | 1269 | if (!boot_cpu_has(X86_FEATURE_PSE)) { |
46723bfa YI |
1270 | next = (addr + PAGE_SIZE) & PAGE_MASK; |
1271 | pmd = pmd_offset(pud, addr); | |
1272 | if (pmd_none(*pmd)) | |
1273 | continue; | |
1274 | get_page_bootmem(section_nr, pmd_page(*pmd), | |
1275 | MIX_SECTION_INFO); | |
1276 | ||
1277 | pte = pte_offset_kernel(pmd, addr); | |
1278 | if (pte_none(*pte)) | |
1279 | continue; | |
1280 | get_page_bootmem(section_nr, pte_page(*pte), | |
1281 | SECTION_INFO); | |
1282 | } else { | |
1283 | next = pmd_addr_end(addr, end); | |
1284 | ||
1285 | pmd = pmd_offset(pud, addr); | |
1286 | if (pmd_none(*pmd)) | |
1287 | continue; | |
1288 | ||
1289 | nr_pages = 1 << (get_order(PMD_SIZE)); | |
1290 | page = pmd_page(*pmd); | |
1291 | while (nr_pages--) | |
1292 | get_page_bootmem(section_nr, page++, | |
1293 | SECTION_INFO); | |
1294 | } | |
1295 | } | |
1296 | } | |
1297 | #endif | |
1298 | ||
c2b91e2e YL |
1299 | void __meminit vmemmap_populate_print_last(void) |
1300 | { | |
1301 | if (p_start) { | |
c9cdaeb2 | 1302 | pr_debug(" [%lx-%lx] PMD -> [%p-%p] on node %d\n", |
c2b91e2e YL |
1303 | addr_start, addr_end-1, p_start, p_end-1, node_start); |
1304 | p_start = NULL; | |
1305 | p_end = NULL; | |
1306 | node_start = 0; | |
1307 | } | |
1308 | } | |
0889eba5 | 1309 | #endif |