Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 LT |
2 | * |
3 | * Copyright (C) 1995 Linus Torvalds | |
4 | * | |
5 | * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999 | |
6 | */ | |
7 | ||
1da177e4 LT |
8 | #include <linux/module.h> |
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/hugetlb.h> | |
19 | #include <linux/swap.h> | |
20 | #include <linux/smp.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/highmem.h> | |
23 | #include <linux/pagemap.h> | |
cfb80c9e | 24 | #include <linux/pci.h> |
6fb14755 | 25 | #include <linux/pfn.h> |
c9cf5528 | 26 | #include <linux/poison.h> |
1da177e4 | 27 | #include <linux/bootmem.h> |
a9ce6bc1 | 28 | #include <linux/memblock.h> |
1da177e4 | 29 | #include <linux/proc_fs.h> |
05039b92 | 30 | #include <linux/memory_hotplug.h> |
27d99f7e | 31 | #include <linux/initrd.h> |
55b2355e | 32 | #include <linux/cpumask.h> |
5a0e3ad6 | 33 | #include <linux/gfp.h> |
1da177e4 | 34 | |
f832ff18 | 35 | #include <asm/asm.h> |
46eaa670 | 36 | #include <asm/bios_ebda.h> |
1da177e4 | 37 | #include <asm/processor.h> |
1da177e4 LT |
38 | #include <asm/uaccess.h> |
39 | #include <asm/pgtable.h> | |
40 | #include <asm/dma.h> | |
41 | #include <asm/fixmap.h> | |
42 | #include <asm/e820.h> | |
43 | #include <asm/apic.h> | |
8550eb99 | 44 | #include <asm/bugs.h> |
1da177e4 LT |
45 | #include <asm/tlb.h> |
46 | #include <asm/tlbflush.h> | |
c10d1e26 | 47 | #include <asm/olpc_ofw.h> |
a5a19c63 | 48 | #include <asm/pgalloc.h> |
1da177e4 | 49 | #include <asm/sections.h> |
b239fb25 | 50 | #include <asm/paravirt.h> |
551889a6 | 51 | #include <asm/setup.h> |
7bfeab9a | 52 | #include <asm/cacheflush.h> |
2b72394e | 53 | #include <asm/page_types.h> |
4fcb2083 | 54 | #include <asm/init.h> |
1da177e4 | 55 | |
1da177e4 LT |
56 | unsigned long highstart_pfn, highend_pfn; |
57 | ||
8550eb99 | 58 | static noinline int do_test_wp_bit(void); |
1da177e4 | 59 | |
dc16ecf7 | 60 | bool __read_mostly __vmalloc_start_set = false; |
4e29684c | 61 | |
d6be89ad | 62 | static __init void *alloc_low_page(void) |
4e29684c | 63 | { |
8d57470d | 64 | unsigned long pfn; |
4e29684c YL |
65 | void *adr; |
66 | ||
8d57470d YL |
67 | if ((pgt_buf_end + 1) >= pgt_buf_top) { |
68 | unsigned long ret; | |
69 | if (min_pfn_mapped >= max_pfn_mapped) | |
70 | panic("alloc_low_page: ran out of memory"); | |
71 | ret = memblock_find_in_range(min_pfn_mapped << PAGE_SHIFT, | |
72 | max_pfn_mapped << PAGE_SHIFT, | |
73 | PAGE_SIZE, PAGE_SIZE); | |
74 | if (!ret) | |
75 | panic("alloc_low_page: can not alloc memory"); | |
76 | memblock_reserve(ret, PAGE_SIZE); | |
77 | pfn = ret >> PAGE_SHIFT; | |
78 | } else | |
79 | pfn = pgt_buf_end++; | |
4e29684c YL |
80 | |
81 | adr = __va(pfn * PAGE_SIZE); | |
234bb549 | 82 | clear_page(adr); |
4e29684c YL |
83 | return adr; |
84 | } | |
85 | ||
1da177e4 LT |
86 | /* |
87 | * Creates a middle page table and puts a pointer to it in the | |
88 | * given global directory entry. This only returns the gd entry | |
89 | * in non-PAE compilation mode, since the middle layer is folded. | |
90 | */ | |
91 | static pmd_t * __init one_md_table_init(pgd_t *pgd) | |
92 | { | |
93 | pud_t *pud; | |
94 | pmd_t *pmd_table; | |
8550eb99 | 95 | |
1da177e4 | 96 | #ifdef CONFIG_X86_PAE |
b239fb25 | 97 | if (!(pgd_val(*pgd) & _PAGE_PRESENT)) { |
c464573c | 98 | if (after_bootmem) |
3c1596ef | 99 | pmd_table = (pmd_t *)alloc_bootmem_pages(PAGE_SIZE); |
4e29684c | 100 | else |
d6be89ad | 101 | pmd_table = (pmd_t *)alloc_low_page(); |
6944a9c8 | 102 | paravirt_alloc_pmd(&init_mm, __pa(pmd_table) >> PAGE_SHIFT); |
b239fb25 JF |
103 | set_pgd(pgd, __pgd(__pa(pmd_table) | _PAGE_PRESENT)); |
104 | pud = pud_offset(pgd, 0); | |
8550eb99 | 105 | BUG_ON(pmd_table != pmd_offset(pud, 0)); |
a376f30a Z |
106 | |
107 | return pmd_table; | |
b239fb25 JF |
108 | } |
109 | #endif | |
1da177e4 LT |
110 | pud = pud_offset(pgd, 0); |
111 | pmd_table = pmd_offset(pud, 0); | |
8550eb99 | 112 | |
1da177e4 LT |
113 | return pmd_table; |
114 | } | |
115 | ||
116 | /* | |
117 | * Create a page table and place a pointer to it in a middle page | |
8550eb99 | 118 | * directory entry: |
1da177e4 LT |
119 | */ |
120 | static pte_t * __init one_page_table_init(pmd_t *pmd) | |
121 | { | |
b239fb25 | 122 | if (!(pmd_val(*pmd) & _PAGE_PRESENT)) { |
509a80c4 IM |
123 | pte_t *page_table = NULL; |
124 | ||
c464573c | 125 | if (after_bootmem) { |
f8561296 | 126 | #if defined(CONFIG_DEBUG_PAGEALLOC) || defined(CONFIG_KMEMCHECK) |
4e29684c | 127 | page_table = (pte_t *) alloc_bootmem_pages(PAGE_SIZE); |
509a80c4 | 128 | #endif |
4e29684c YL |
129 | if (!page_table) |
130 | page_table = | |
3c1596ef | 131 | (pte_t *)alloc_bootmem_pages(PAGE_SIZE); |
d6be89ad JB |
132 | } else |
133 | page_table = (pte_t *)alloc_low_page(); | |
b239fb25 | 134 | |
6944a9c8 | 135 | paravirt_alloc_pte(&init_mm, __pa(page_table) >> PAGE_SHIFT); |
1da177e4 | 136 | set_pmd(pmd, __pmd(__pa(page_table) | _PAGE_TABLE)); |
b239fb25 | 137 | BUG_ON(page_table != pte_offset_kernel(pmd, 0)); |
1da177e4 | 138 | } |
509a80c4 | 139 | |
1da177e4 LT |
140 | return pte_offset_kernel(pmd, 0); |
141 | } | |
142 | ||
458a3e64 | 143 | pmd_t * __init populate_extra_pmd(unsigned long vaddr) |
11124411 TH |
144 | { |
145 | int pgd_idx = pgd_index(vaddr); | |
146 | int pmd_idx = pmd_index(vaddr); | |
458a3e64 TH |
147 | |
148 | return one_md_table_init(swapper_pg_dir + pgd_idx) + pmd_idx; | |
149 | } | |
150 | ||
151 | pte_t * __init populate_extra_pte(unsigned long vaddr) | |
152 | { | |
153 | int pte_idx = pte_index(vaddr); | |
11124411 TH |
154 | pmd_t *pmd; |
155 | ||
458a3e64 TH |
156 | pmd = populate_extra_pmd(vaddr); |
157 | return one_page_table_init(pmd) + pte_idx; | |
11124411 TH |
158 | } |
159 | ||
a3c6018e JB |
160 | static pte_t *__init page_table_kmap_check(pte_t *pte, pmd_t *pmd, |
161 | unsigned long vaddr, pte_t *lastpte) | |
162 | { | |
163 | #ifdef CONFIG_HIGHMEM | |
164 | /* | |
165 | * Something (early fixmap) may already have put a pte | |
166 | * page here, which causes the page table allocation | |
167 | * to become nonlinear. Attempt to fix it, and if it | |
168 | * is still nonlinear then we have to bug. | |
169 | */ | |
170 | int pmd_idx_kmap_begin = fix_to_virt(FIX_KMAP_END) >> PMD_SHIFT; | |
171 | int pmd_idx_kmap_end = fix_to_virt(FIX_KMAP_BEGIN) >> PMD_SHIFT; | |
172 | ||
173 | if (pmd_idx_kmap_begin != pmd_idx_kmap_end | |
174 | && (vaddr >> PMD_SHIFT) >= pmd_idx_kmap_begin | |
175 | && (vaddr >> PMD_SHIFT) <= pmd_idx_kmap_end | |
d1b19426 YL |
176 | && ((__pa(pte) >> PAGE_SHIFT) < pgt_buf_start |
177 | || (__pa(pte) >> PAGE_SHIFT) >= pgt_buf_end)) { | |
a3c6018e JB |
178 | pte_t *newpte; |
179 | int i; | |
180 | ||
c464573c | 181 | BUG_ON(after_bootmem); |
a3c6018e JB |
182 | newpte = alloc_low_page(); |
183 | for (i = 0; i < PTRS_PER_PTE; i++) | |
184 | set_pte(newpte + i, pte[i]); | |
185 | ||
186 | paravirt_alloc_pte(&init_mm, __pa(newpte) >> PAGE_SHIFT); | |
187 | set_pmd(pmd, __pmd(__pa(newpte)|_PAGE_TABLE)); | |
188 | BUG_ON(newpte != pte_offset_kernel(pmd, 0)); | |
189 | __flush_tlb_all(); | |
190 | ||
191 | paravirt_release_pte(__pa(pte) >> PAGE_SHIFT); | |
192 | pte = newpte; | |
193 | } | |
194 | BUG_ON(vaddr < fix_to_virt(FIX_KMAP_BEGIN - 1) | |
195 | && vaddr > fix_to_virt(FIX_KMAP_END) | |
196 | && lastpte && lastpte + PTRS_PER_PTE != pte); | |
197 | #endif | |
198 | return pte; | |
199 | } | |
200 | ||
1da177e4 | 201 | /* |
8550eb99 | 202 | * This function initializes a certain range of kernel virtual memory |
1da177e4 LT |
203 | * with new bootmem page tables, everywhere page tables are missing in |
204 | * the given range. | |
8550eb99 IM |
205 | * |
206 | * NOTE: The pagetables are allocated contiguous on the physical space | |
207 | * so we can cache the place of the first one and move around without | |
1da177e4 LT |
208 | * checking the pgd every time. |
209 | */ | |
8550eb99 IM |
210 | static void __init |
211 | page_table_range_init(unsigned long start, unsigned long end, pgd_t *pgd_base) | |
1da177e4 | 212 | { |
1da177e4 LT |
213 | int pgd_idx, pmd_idx; |
214 | unsigned long vaddr; | |
8550eb99 IM |
215 | pgd_t *pgd; |
216 | pmd_t *pmd; | |
a3c6018e | 217 | pte_t *pte = NULL; |
1da177e4 LT |
218 | |
219 | vaddr = start; | |
220 | pgd_idx = pgd_index(vaddr); | |
221 | pmd_idx = pmd_index(vaddr); | |
222 | pgd = pgd_base + pgd_idx; | |
223 | ||
224 | for ( ; (pgd_idx < PTRS_PER_PGD) && (vaddr != end); pgd++, pgd_idx++) { | |
b239fb25 JF |
225 | pmd = one_md_table_init(pgd); |
226 | pmd = pmd + pmd_index(vaddr); | |
8550eb99 IM |
227 | for (; (pmd_idx < PTRS_PER_PMD) && (vaddr != end); |
228 | pmd++, pmd_idx++) { | |
a3c6018e JB |
229 | pte = page_table_kmap_check(one_page_table_init(pmd), |
230 | pmd, vaddr, pte); | |
1da177e4 LT |
231 | |
232 | vaddr += PMD_SIZE; | |
233 | } | |
234 | pmd_idx = 0; | |
235 | } | |
236 | } | |
237 | ||
238 | static inline int is_kernel_text(unsigned long addr) | |
239 | { | |
5bd5a452 | 240 | if (addr >= (unsigned long)_text && addr <= (unsigned long)__init_end) |
1da177e4 LT |
241 | return 1; |
242 | return 0; | |
243 | } | |
244 | ||
245 | /* | |
8550eb99 IM |
246 | * This maps the physical memory to kernel virtual address space, a total |
247 | * of max_low_pfn pages, by creating page tables starting from address | |
248 | * PAGE_OFFSET: | |
1da177e4 | 249 | */ |
e53fb04f PE |
250 | unsigned long __init |
251 | kernel_physical_mapping_init(unsigned long start, | |
252 | unsigned long end, | |
253 | unsigned long page_size_mask) | |
1da177e4 | 254 | { |
e53fb04f | 255 | int use_pse = page_size_mask == (1<<PG_LEVEL_2M); |
c1fd1b43 | 256 | unsigned long last_map_addr = end; |
e53fb04f | 257 | unsigned long start_pfn, end_pfn; |
e7179853 | 258 | pgd_t *pgd_base = swapper_pg_dir; |
8550eb99 | 259 | int pgd_idx, pmd_idx, pte_ofs; |
1da177e4 LT |
260 | unsigned long pfn; |
261 | pgd_t *pgd; | |
262 | pmd_t *pmd; | |
263 | pte_t *pte; | |
a2699e47 SS |
264 | unsigned pages_2m, pages_4k; |
265 | int mapping_iter; | |
266 | ||
e53fb04f PE |
267 | start_pfn = start >> PAGE_SHIFT; |
268 | end_pfn = end >> PAGE_SHIFT; | |
269 | ||
a2699e47 SS |
270 | /* |
271 | * First iteration will setup identity mapping using large/small pages | |
272 | * based on use_pse, with other attributes same as set by | |
273 | * the early code in head_32.S | |
274 | * | |
275 | * Second iteration will setup the appropriate attributes (NX, GLOBAL..) | |
276 | * as desired for the kernel identity mapping. | |
277 | * | |
278 | * This two pass mechanism conforms to the TLB app note which says: | |
279 | * | |
280 | * "Software should not write to a paging-structure entry in a way | |
281 | * that would change, for any linear address, both the page size | |
282 | * and either the page frame or attributes." | |
283 | */ | |
284 | mapping_iter = 1; | |
1da177e4 | 285 | |
a04ad82d YL |
286 | if (!cpu_has_pse) |
287 | use_pse = 0; | |
1da177e4 | 288 | |
a2699e47 SS |
289 | repeat: |
290 | pages_2m = pages_4k = 0; | |
a04ad82d YL |
291 | pfn = start_pfn; |
292 | pgd_idx = pgd_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET); | |
293 | pgd = pgd_base + pgd_idx; | |
1da177e4 LT |
294 | for (; pgd_idx < PTRS_PER_PGD; pgd++, pgd_idx++) { |
295 | pmd = one_md_table_init(pgd); | |
8550eb99 | 296 | |
a04ad82d YL |
297 | if (pfn >= end_pfn) |
298 | continue; | |
299 | #ifdef CONFIG_X86_PAE | |
300 | pmd_idx = pmd_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET); | |
301 | pmd += pmd_idx; | |
302 | #else | |
303 | pmd_idx = 0; | |
304 | #endif | |
305 | for (; pmd_idx < PTRS_PER_PMD && pfn < end_pfn; | |
f3f20de8 | 306 | pmd++, pmd_idx++) { |
8550eb99 | 307 | unsigned int addr = pfn * PAGE_SIZE + PAGE_OFFSET; |
1da177e4 | 308 | |
8550eb99 IM |
309 | /* |
310 | * Map with big pages if possible, otherwise | |
311 | * create normal page tables: | |
312 | */ | |
a04ad82d | 313 | if (use_pse) { |
8550eb99 | 314 | unsigned int addr2; |
f3f20de8 | 315 | pgprot_t prot = PAGE_KERNEL_LARGE; |
a2699e47 SS |
316 | /* |
317 | * first pass will use the same initial | |
318 | * identity mapping attribute + _PAGE_PSE. | |
319 | */ | |
320 | pgprot_t init_prot = | |
321 | __pgprot(PTE_IDENT_ATTR | | |
322 | _PAGE_PSE); | |
f3f20de8 | 323 | |
960ddb4f | 324 | pfn &= PMD_MASK >> PAGE_SHIFT; |
8550eb99 | 325 | addr2 = (pfn + PTRS_PER_PTE-1) * PAGE_SIZE + |
f3f20de8 JF |
326 | PAGE_OFFSET + PAGE_SIZE-1; |
327 | ||
8550eb99 IM |
328 | if (is_kernel_text(addr) || |
329 | is_kernel_text(addr2)) | |
f3f20de8 JF |
330 | prot = PAGE_KERNEL_LARGE_EXEC; |
331 | ||
ce0c0e50 | 332 | pages_2m++; |
a2699e47 SS |
333 | if (mapping_iter == 1) |
334 | set_pmd(pmd, pfn_pmd(pfn, init_prot)); | |
335 | else | |
336 | set_pmd(pmd, pfn_pmd(pfn, prot)); | |
b239fb25 | 337 | |
1da177e4 | 338 | pfn += PTRS_PER_PTE; |
8550eb99 IM |
339 | continue; |
340 | } | |
341 | pte = one_page_table_init(pmd); | |
1da177e4 | 342 | |
a04ad82d YL |
343 | pte_ofs = pte_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET); |
344 | pte += pte_ofs; | |
345 | for (; pte_ofs < PTRS_PER_PTE && pfn < end_pfn; | |
8550eb99 IM |
346 | pte++, pfn++, pte_ofs++, addr += PAGE_SIZE) { |
347 | pgprot_t prot = PAGE_KERNEL; | |
a2699e47 SS |
348 | /* |
349 | * first pass will use the same initial | |
350 | * identity mapping attribute. | |
351 | */ | |
352 | pgprot_t init_prot = __pgprot(PTE_IDENT_ATTR); | |
f3f20de8 | 353 | |
8550eb99 IM |
354 | if (is_kernel_text(addr)) |
355 | prot = PAGE_KERNEL_EXEC; | |
f3f20de8 | 356 | |
ce0c0e50 | 357 | pages_4k++; |
c1fd1b43 | 358 | if (mapping_iter == 1) { |
a2699e47 | 359 | set_pte(pte, pfn_pte(pfn, init_prot)); |
c1fd1b43 PE |
360 | last_map_addr = (pfn << PAGE_SHIFT) + PAGE_SIZE; |
361 | } else | |
a2699e47 | 362 | set_pte(pte, pfn_pte(pfn, prot)); |
1da177e4 LT |
363 | } |
364 | } | |
365 | } | |
a2699e47 SS |
366 | if (mapping_iter == 1) { |
367 | /* | |
368 | * update direct mapping page count only in the first | |
369 | * iteration. | |
370 | */ | |
371 | update_page_count(PG_LEVEL_2M, pages_2m); | |
372 | update_page_count(PG_LEVEL_4K, pages_4k); | |
373 | ||
374 | /* | |
375 | * local global flush tlb, which will flush the previous | |
376 | * mappings present in both small and large page TLB's. | |
377 | */ | |
378 | __flush_tlb_all(); | |
379 | ||
380 | /* | |
381 | * Second iteration will set the actual desired PTE attributes. | |
382 | */ | |
383 | mapping_iter = 2; | |
384 | goto repeat; | |
385 | } | |
c1fd1b43 | 386 | return last_map_addr; |
ae531c26 AV |
387 | } |
388 | ||
1da177e4 LT |
389 | pte_t *kmap_pte; |
390 | pgprot_t kmap_prot; | |
391 | ||
8550eb99 IM |
392 | static inline pte_t *kmap_get_fixmap_pte(unsigned long vaddr) |
393 | { | |
394 | return pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), | |
395 | vaddr), vaddr), vaddr); | |
396 | } | |
1da177e4 LT |
397 | |
398 | static void __init kmap_init(void) | |
399 | { | |
400 | unsigned long kmap_vstart; | |
401 | ||
8550eb99 IM |
402 | /* |
403 | * Cache the first kmap pte: | |
404 | */ | |
1da177e4 LT |
405 | kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN); |
406 | kmap_pte = kmap_get_fixmap_pte(kmap_vstart); | |
407 | ||
408 | kmap_prot = PAGE_KERNEL; | |
409 | } | |
410 | ||
fd940934 | 411 | #ifdef CONFIG_HIGHMEM |
1da177e4 LT |
412 | static void __init permanent_kmaps_init(pgd_t *pgd_base) |
413 | { | |
8550eb99 | 414 | unsigned long vaddr; |
1da177e4 LT |
415 | pgd_t *pgd; |
416 | pud_t *pud; | |
417 | pmd_t *pmd; | |
418 | pte_t *pte; | |
1da177e4 LT |
419 | |
420 | vaddr = PKMAP_BASE; | |
421 | page_table_range_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base); | |
422 | ||
423 | pgd = swapper_pg_dir + pgd_index(vaddr); | |
424 | pud = pud_offset(pgd, vaddr); | |
425 | pmd = pmd_offset(pud, vaddr); | |
426 | pte = pte_offset_kernel(pmd, vaddr); | |
8550eb99 | 427 | pkmap_page_table = pte; |
1da177e4 LT |
428 | } |
429 | ||
b1258ac2 | 430 | static void __init add_one_highpage_init(struct page *page) |
1da177e4 | 431 | { |
cc9f7a0c YL |
432 | ClearPageReserved(page); |
433 | init_page_count(page); | |
434 | __free_page(page); | |
435 | totalhigh_pages++; | |
1da177e4 LT |
436 | } |
437 | ||
1d931264 YL |
438 | void __init add_highpages_with_active_regions(int nid, |
439 | unsigned long start_pfn, unsigned long end_pfn) | |
1da177e4 | 440 | { |
8a9ca34c TH |
441 | phys_addr_t start, end; |
442 | u64 i; | |
443 | ||
444 | for_each_free_mem_range(i, nid, &start, &end, NULL) { | |
445 | unsigned long pfn = clamp_t(unsigned long, PFN_UP(start), | |
446 | start_pfn, end_pfn); | |
447 | unsigned long e_pfn = clamp_t(unsigned long, PFN_DOWN(end), | |
448 | start_pfn, end_pfn); | |
449 | for ( ; pfn < e_pfn; pfn++) | |
450 | if (pfn_valid(pfn)) | |
451 | add_one_highpage_init(pfn_to_page(pfn)); | |
23be8c7d | 452 | } |
b5bc6c0e | 453 | } |
1da177e4 | 454 | #else |
e8e32326 IB |
455 | static inline void permanent_kmaps_init(pgd_t *pgd_base) |
456 | { | |
457 | } | |
1da177e4 LT |
458 | #endif /* CONFIG_HIGHMEM */ |
459 | ||
7737b215 | 460 | void __init native_pagetable_init(void) |
1da177e4 | 461 | { |
551889a6 | 462 | unsigned long pfn, va; |
73090f89 | 463 | pgd_t *pgd, *base = swapper_pg_dir; |
551889a6 IC |
464 | pud_t *pud; |
465 | pmd_t *pmd; | |
466 | pte_t *pte; | |
b239fb25 JF |
467 | |
468 | /* | |
551889a6 IC |
469 | * Remove any mappings which extend past the end of physical |
470 | * memory from the boot time page table: | |
b239fb25 | 471 | */ |
551889a6 IC |
472 | for (pfn = max_low_pfn + 1; pfn < 1<<(32-PAGE_SHIFT); pfn++) { |
473 | va = PAGE_OFFSET + (pfn<<PAGE_SHIFT); | |
474 | pgd = base + pgd_index(va); | |
475 | if (!pgd_present(*pgd)) | |
476 | break; | |
477 | ||
478 | pud = pud_offset(pgd, va); | |
479 | pmd = pmd_offset(pud, va); | |
480 | if (!pmd_present(*pmd)) | |
481 | break; | |
482 | ||
483 | pte = pte_offset_kernel(pmd, va); | |
484 | if (!pte_present(*pte)) | |
485 | break; | |
486 | ||
487 | pte_clear(NULL, va, pte); | |
488 | } | |
6944a9c8 | 489 | paravirt_alloc_pmd(&init_mm, __pa(base) >> PAGE_SHIFT); |
843b8ed2 | 490 | paging_init(); |
b239fb25 JF |
491 | } |
492 | ||
b239fb25 JF |
493 | /* |
494 | * Build a proper pagetable for the kernel mappings. Up until this | |
495 | * point, we've been running on some set of pagetables constructed by | |
496 | * the boot process. | |
497 | * | |
498 | * If we're booting on native hardware, this will be a pagetable | |
551889a6 IC |
499 | * constructed in arch/x86/kernel/head_32.S. The root of the |
500 | * pagetable will be swapper_pg_dir. | |
b239fb25 JF |
501 | * |
502 | * If we're booting paravirtualized under a hypervisor, then there are | |
503 | * more options: we may already be running PAE, and the pagetable may | |
504 | * or may not be based in swapper_pg_dir. In any case, | |
7737b215 | 505 | * paravirt_pagetable_init() will set up swapper_pg_dir |
b239fb25 JF |
506 | * appropriately for the rest of the initialization to work. |
507 | * | |
508 | * In general, pagetable_init() assumes that the pagetable may already | |
509 | * be partially populated, and so it avoids stomping on any existing | |
510 | * mappings. | |
511 | */ | |
f765090a | 512 | void __init early_ioremap_page_table_range_init(void) |
b239fb25 | 513 | { |
e7179853 | 514 | pgd_t *pgd_base = swapper_pg_dir; |
8550eb99 | 515 | unsigned long vaddr, end; |
b239fb25 | 516 | |
1da177e4 LT |
517 | /* |
518 | * Fixed mappings, only the page table structure has to be | |
519 | * created - mappings will be set by set_fixmap(): | |
520 | */ | |
521 | vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK; | |
b239fb25 JF |
522 | end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK; |
523 | page_table_range_init(vaddr, end, pgd_base); | |
beacfaac | 524 | early_ioremap_reset(); |
e7b37895 YL |
525 | } |
526 | ||
527 | static void __init pagetable_init(void) | |
528 | { | |
529 | pgd_t *pgd_base = swapper_pg_dir; | |
530 | ||
1da177e4 | 531 | permanent_kmaps_init(pgd_base); |
1da177e4 LT |
532 | } |
533 | ||
be43d728 | 534 | pteval_t __supported_pte_mask __read_mostly = ~(_PAGE_NX | _PAGE_GLOBAL | _PAGE_IOMAP); |
6fdc05d4 JF |
535 | EXPORT_SYMBOL_GPL(__supported_pte_mask); |
536 | ||
90d967e0 YL |
537 | /* user-defined highmem size */ |
538 | static unsigned int highmem_pages = -1; | |
539 | ||
540 | /* | |
541 | * highmem=size forces highmem to be exactly 'size' bytes. | |
542 | * This works even on boxes that have no highmem otherwise. | |
543 | * This also works to reduce highmem size on bigger boxes. | |
544 | */ | |
545 | static int __init parse_highmem(char *arg) | |
546 | { | |
547 | if (!arg) | |
548 | return -EINVAL; | |
549 | ||
550 | highmem_pages = memparse(arg, &arg) >> PAGE_SHIFT; | |
551 | return 0; | |
552 | } | |
553 | early_param("highmem", parse_highmem); | |
554 | ||
4769843b IM |
555 | #define MSG_HIGHMEM_TOO_BIG \ |
556 | "highmem size (%luMB) is bigger than pages available (%luMB)!\n" | |
557 | ||
558 | #define MSG_LOWMEM_TOO_SMALL \ | |
559 | "highmem size (%luMB) results in <64MB lowmem, ignoring it!\n" | |
90d967e0 | 560 | /* |
4769843b IM |
561 | * All of RAM fits into lowmem - but if user wants highmem |
562 | * artificially via the highmem=x boot parameter then create | |
563 | * it: | |
90d967e0 | 564 | */ |
4769843b | 565 | void __init lowmem_pfn_init(void) |
90d967e0 | 566 | { |
346cafec | 567 | /* max_low_pfn is 0, we already have early_res support */ |
90d967e0 | 568 | max_low_pfn = max_pfn; |
d88316c2 | 569 | |
4769843b IM |
570 | if (highmem_pages == -1) |
571 | highmem_pages = 0; | |
572 | #ifdef CONFIG_HIGHMEM | |
573 | if (highmem_pages >= max_pfn) { | |
574 | printk(KERN_ERR MSG_HIGHMEM_TOO_BIG, | |
575 | pages_to_mb(highmem_pages), pages_to_mb(max_pfn)); | |
576 | highmem_pages = 0; | |
577 | } | |
578 | if (highmem_pages) { | |
579 | if (max_low_pfn - highmem_pages < 64*1024*1024/PAGE_SIZE) { | |
580 | printk(KERN_ERR MSG_LOWMEM_TOO_SMALL, | |
90d967e0 YL |
581 | pages_to_mb(highmem_pages)); |
582 | highmem_pages = 0; | |
583 | } | |
4769843b IM |
584 | max_low_pfn -= highmem_pages; |
585 | } | |
586 | #else | |
587 | if (highmem_pages) | |
588 | printk(KERN_ERR "ignoring highmem size on non-highmem kernel!\n"); | |
589 | #endif | |
590 | } | |
591 | ||
592 | #define MSG_HIGHMEM_TOO_SMALL \ | |
593 | "only %luMB highmem pages available, ignoring highmem size of %luMB!\n" | |
594 | ||
595 | #define MSG_HIGHMEM_TRIMMED \ | |
596 | "Warning: only 4GB will be used. Use a HIGHMEM64G enabled kernel!\n" | |
597 | /* | |
598 | * We have more RAM than fits into lowmem - we try to put it into | |
599 | * highmem, also taking the highmem=x boot parameter into account: | |
600 | */ | |
601 | void __init highmem_pfn_init(void) | |
602 | { | |
d88316c2 IM |
603 | max_low_pfn = MAXMEM_PFN; |
604 | ||
4769843b IM |
605 | if (highmem_pages == -1) |
606 | highmem_pages = max_pfn - MAXMEM_PFN; | |
607 | ||
608 | if (highmem_pages + MAXMEM_PFN < max_pfn) | |
609 | max_pfn = MAXMEM_PFN + highmem_pages; | |
610 | ||
611 | if (highmem_pages + MAXMEM_PFN > max_pfn) { | |
612 | printk(KERN_WARNING MSG_HIGHMEM_TOO_SMALL, | |
613 | pages_to_mb(max_pfn - MAXMEM_PFN), | |
614 | pages_to_mb(highmem_pages)); | |
615 | highmem_pages = 0; | |
616 | } | |
90d967e0 | 617 | #ifndef CONFIG_HIGHMEM |
4769843b IM |
618 | /* Maximum memory usable is what is directly addressable */ |
619 | printk(KERN_WARNING "Warning only %ldMB will be used.\n", MAXMEM>>20); | |
620 | if (max_pfn > MAX_NONPAE_PFN) | |
621 | printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n"); | |
622 | else | |
623 | printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n"); | |
624 | max_pfn = MAXMEM_PFN; | |
90d967e0 YL |
625 | #else /* !CONFIG_HIGHMEM */ |
626 | #ifndef CONFIG_HIGHMEM64G | |
4769843b IM |
627 | if (max_pfn > MAX_NONPAE_PFN) { |
628 | max_pfn = MAX_NONPAE_PFN; | |
629 | printk(KERN_WARNING MSG_HIGHMEM_TRIMMED); | |
630 | } | |
90d967e0 YL |
631 | #endif /* !CONFIG_HIGHMEM64G */ |
632 | #endif /* !CONFIG_HIGHMEM */ | |
4769843b IM |
633 | } |
634 | ||
635 | /* | |
636 | * Determine low and high memory ranges: | |
637 | */ | |
638 | void __init find_low_pfn_range(void) | |
639 | { | |
640 | /* it could update max_pfn */ | |
641 | ||
d88316c2 | 642 | if (max_pfn <= MAXMEM_PFN) |
4769843b | 643 | lowmem_pfn_init(); |
d88316c2 IM |
644 | else |
645 | highmem_pfn_init(); | |
90d967e0 YL |
646 | } |
647 | ||
b2ac82a0 | 648 | #ifndef CONFIG_NEED_MULTIPLE_NODES |
d8fc3afc | 649 | void __init initmem_init(void) |
b2ac82a0 | 650 | { |
b2ac82a0 YL |
651 | #ifdef CONFIG_HIGHMEM |
652 | highstart_pfn = highend_pfn = max_pfn; | |
653 | if (max_pfn > max_low_pfn) | |
654 | highstart_pfn = max_low_pfn; | |
b2ac82a0 YL |
655 | printk(KERN_NOTICE "%ldMB HIGHMEM available.\n", |
656 | pages_to_mb(highend_pfn - highstart_pfn)); | |
657 | num_physpages = highend_pfn; | |
658 | high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1; | |
659 | #else | |
b2ac82a0 YL |
660 | num_physpages = max_low_pfn; |
661 | high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1; | |
662 | #endif | |
0608f70c TH |
663 | |
664 | memblock_set_node(0, (phys_addr_t)ULLONG_MAX, 0); | |
665 | sparse_memory_present_with_active_regions(0); | |
666 | ||
b2ac82a0 YL |
667 | #ifdef CONFIG_FLATMEM |
668 | max_mapnr = num_physpages; | |
669 | #endif | |
dc16ecf7 JF |
670 | __vmalloc_start_set = true; |
671 | ||
b2ac82a0 YL |
672 | printk(KERN_NOTICE "%ldMB LOWMEM available.\n", |
673 | pages_to_mb(max_low_pfn)); | |
674 | ||
675 | setup_bootmem_allocator(); | |
b2ac82a0 | 676 | } |
cb95a13a | 677 | #endif /* !CONFIG_NEED_MULTIPLE_NODES */ |
b2ac82a0 | 678 | |
b2ac82a0 YL |
679 | void __init setup_bootmem_allocator(void) |
680 | { | |
b2ac82a0 YL |
681 | printk(KERN_INFO " mapped low ram: 0 - %08lx\n", |
682 | max_pfn_mapped<<PAGE_SHIFT); | |
fc5efe39 | 683 | printk(KERN_INFO " low ram: 0 - %08lx\n", max_low_pfn<<PAGE_SHIFT); |
7482b0e9 | 684 | |
c464573c | 685 | after_bootmem = 1; |
4e29684c YL |
686 | } |
687 | ||
1da177e4 LT |
688 | /* |
689 | * paging_init() sets up the page tables - note that the first 8MB are | |
690 | * already mapped by head.S. | |
691 | * | |
692 | * This routines also unmaps the page at virtual kernel address 0, so | |
693 | * that we can trap those pesky NULL-reference errors in the kernel. | |
694 | */ | |
695 | void __init paging_init(void) | |
696 | { | |
1da177e4 LT |
697 | pagetable_init(); |
698 | ||
1da177e4 LT |
699 | __flush_tlb_all(); |
700 | ||
701 | kmap_init(); | |
11cd0bc1 YL |
702 | |
703 | /* | |
704 | * NOTE: at this point the bootmem allocator is fully available. | |
705 | */ | |
c10d1e26 | 706 | olpc_dt_build_devicetree(); |
797390d8 | 707 | sparse_memory_present_with_active_regions(MAX_NUMNODES); |
11cd0bc1 YL |
708 | sparse_init(); |
709 | zone_sizes_init(); | |
1da177e4 LT |
710 | } |
711 | ||
712 | /* | |
713 | * Test if the WP bit works in supervisor mode. It isn't supported on 386's | |
f7f17a67 DV |
714 | * and also on some strange 486's. All 586+'s are OK. This used to involve |
715 | * black magic jumps to work around some nasty CPU bugs, but fortunately the | |
716 | * switch to using exceptions got rid of all that. | |
1da177e4 | 717 | */ |
1da177e4 LT |
718 | static void __init test_wp_bit(void) |
719 | { | |
d7d119d7 IM |
720 | printk(KERN_INFO |
721 | "Checking if this processor honours the WP bit even in supervisor mode..."); | |
1da177e4 LT |
722 | |
723 | /* Any page-aligned address will do, the test is non-destructive */ | |
8bd753be | 724 | __set_fixmap(FIX_WP_TEST, __pa(&swapper_pg_dir), PAGE_KERNEL_RO); |
1da177e4 LT |
725 | boot_cpu_data.wp_works_ok = do_test_wp_bit(); |
726 | clear_fixmap(FIX_WP_TEST); | |
727 | ||
728 | if (!boot_cpu_data.wp_works_ok) { | |
d7d119d7 | 729 | printk(KERN_CONT "No.\n"); |
1da177e4 | 730 | #ifdef CONFIG_X86_WP_WORKS_OK |
d7d119d7 IM |
731 | panic( |
732 | "This kernel doesn't support CPU's with broken WP. Recompile it for a 386!"); | |
1da177e4 LT |
733 | #endif |
734 | } else { | |
d7d119d7 | 735 | printk(KERN_CONT "Ok.\n"); |
1da177e4 LT |
736 | } |
737 | } | |
738 | ||
1da177e4 LT |
739 | void __init mem_init(void) |
740 | { | |
1da177e4 | 741 | int codesize, reservedpages, datasize, initsize; |
cc9f7a0c | 742 | int tmp; |
1da177e4 | 743 | |
cfb80c9e JF |
744 | pci_iommu_alloc(); |
745 | ||
05b79bdc | 746 | #ifdef CONFIG_FLATMEM |
8d8f3cbe | 747 | BUG_ON(!mem_map); |
1da177e4 | 748 | #endif |
855c743a SG |
749 | /* |
750 | * With CONFIG_DEBUG_PAGEALLOC initialization of highmem pages has to | |
751 | * be done before free_all_bootmem(). Memblock use free low memory for | |
752 | * temporary data (see find_range_array()) and for this purpose can use | |
753 | * pages that was already passed to the buddy allocator, hence marked as | |
754 | * not accessible in the page tables when compiled with | |
755 | * CONFIG_DEBUG_PAGEALLOC. Otherwise order of initialization is not | |
756 | * important here. | |
757 | */ | |
758 | set_highmem_pages_init(); | |
759 | ||
1da177e4 LT |
760 | /* this will put all low memory onto the freelists */ |
761 | totalram_pages += free_all_bootmem(); | |
762 | ||
763 | reservedpages = 0; | |
764 | for (tmp = 0; tmp < max_low_pfn; tmp++) | |
765 | /* | |
8550eb99 | 766 | * Only count reserved RAM pages: |
1da177e4 LT |
767 | */ |
768 | if (page_is_ram(tmp) && PageReserved(pfn_to_page(tmp))) | |
769 | reservedpages++; | |
770 | ||
1da177e4 LT |
771 | codesize = (unsigned long) &_etext - (unsigned long) &_text; |
772 | datasize = (unsigned long) &_edata - (unsigned long) &_etext; | |
773 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; | |
774 | ||
8550eb99 IM |
775 | printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, " |
776 | "%dk reserved, %dk data, %dk init, %ldk highmem)\n", | |
cc013a88 | 777 | nr_free_pages() << (PAGE_SHIFT-10), |
1da177e4 LT |
778 | num_physpages << (PAGE_SHIFT-10), |
779 | codesize >> 10, | |
780 | reservedpages << (PAGE_SHIFT-10), | |
781 | datasize >> 10, | |
782 | initsize >> 10, | |
4b529401 | 783 | totalhigh_pages << (PAGE_SHIFT-10)); |
1da177e4 | 784 | |
d7d119d7 | 785 | printk(KERN_INFO "virtual kernel memory layout:\n" |
8550eb99 | 786 | " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" |
052e7994 | 787 | #ifdef CONFIG_HIGHMEM |
8550eb99 | 788 | " pkmap : 0x%08lx - 0x%08lx (%4ld kB)\n" |
052e7994 | 789 | #endif |
8550eb99 IM |
790 | " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" |
791 | " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
792 | " .init : 0x%08lx - 0x%08lx (%4ld kB)\n" | |
793 | " .data : 0x%08lx - 0x%08lx (%4ld kB)\n" | |
794 | " .text : 0x%08lx - 0x%08lx (%4ld kB)\n", | |
795 | FIXADDR_START, FIXADDR_TOP, | |
796 | (FIXADDR_TOP - FIXADDR_START) >> 10, | |
052e7994 JF |
797 | |
798 | #ifdef CONFIG_HIGHMEM | |
8550eb99 IM |
799 | PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE, |
800 | (LAST_PKMAP*PAGE_SIZE) >> 10, | |
052e7994 JF |
801 | #endif |
802 | ||
8550eb99 IM |
803 | VMALLOC_START, VMALLOC_END, |
804 | (VMALLOC_END - VMALLOC_START) >> 20, | |
052e7994 | 805 | |
8550eb99 IM |
806 | (unsigned long)__va(0), (unsigned long)high_memory, |
807 | ((unsigned long)high_memory - (unsigned long)__va(0)) >> 20, | |
052e7994 | 808 | |
8550eb99 IM |
809 | (unsigned long)&__init_begin, (unsigned long)&__init_end, |
810 | ((unsigned long)&__init_end - | |
811 | (unsigned long)&__init_begin) >> 10, | |
052e7994 | 812 | |
8550eb99 IM |
813 | (unsigned long)&_etext, (unsigned long)&_edata, |
814 | ((unsigned long)&_edata - (unsigned long)&_etext) >> 10, | |
052e7994 | 815 | |
8550eb99 IM |
816 | (unsigned long)&_text, (unsigned long)&_etext, |
817 | ((unsigned long)&_etext - (unsigned long)&_text) >> 10); | |
052e7994 | 818 | |
beeb4195 JB |
819 | /* |
820 | * Check boundaries twice: Some fundamental inconsistencies can | |
821 | * be detected at build time already. | |
822 | */ | |
823 | #define __FIXADDR_TOP (-PAGE_SIZE) | |
824 | #ifdef CONFIG_HIGHMEM | |
825 | BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP*PAGE_SIZE > FIXADDR_START); | |
826 | BUILD_BUG_ON(VMALLOC_END > PKMAP_BASE); | |
827 | #endif | |
828 | #define high_memory (-128UL << 20) | |
829 | BUILD_BUG_ON(VMALLOC_START >= VMALLOC_END); | |
830 | #undef high_memory | |
831 | #undef __FIXADDR_TOP | |
832 | ||
052e7994 | 833 | #ifdef CONFIG_HIGHMEM |
8550eb99 IM |
834 | BUG_ON(PKMAP_BASE + LAST_PKMAP*PAGE_SIZE > FIXADDR_START); |
835 | BUG_ON(VMALLOC_END > PKMAP_BASE); | |
052e7994 | 836 | #endif |
beeb4195 | 837 | BUG_ON(VMALLOC_START >= VMALLOC_END); |
8550eb99 | 838 | BUG_ON((unsigned long)high_memory > VMALLOC_START); |
052e7994 | 839 | |
1da177e4 LT |
840 | if (boot_cpu_data.wp_works_ok < 0) |
841 | test_wp_bit(); | |
1da177e4 LT |
842 | } |
843 | ||
ad8f5797 | 844 | #ifdef CONFIG_MEMORY_HOTPLUG |
bc02af93 | 845 | int arch_add_memory(int nid, u64 start, u64 size) |
05039b92 | 846 | { |
7c7e9425 | 847 | struct pglist_data *pgdata = NODE_DATA(nid); |
776ed98b | 848 | struct zone *zone = pgdata->node_zones + ZONE_HIGHMEM; |
05039b92 DH |
849 | unsigned long start_pfn = start >> PAGE_SHIFT; |
850 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
851 | ||
c04fc586 | 852 | return __add_pages(nid, zone, start_pfn, nr_pages); |
05039b92 | 853 | } |
9d99aaa3 | 854 | #endif |
05039b92 | 855 | |
1da177e4 LT |
856 | /* |
857 | * This function cannot be __init, since exceptions don't work in that | |
858 | * section. Put this after the callers, so that it cannot be inlined. | |
859 | */ | |
8550eb99 | 860 | static noinline int do_test_wp_bit(void) |
1da177e4 LT |
861 | { |
862 | char tmp_reg; | |
863 | int flag; | |
864 | ||
865 | __asm__ __volatile__( | |
8550eb99 IM |
866 | " movb %0, %1 \n" |
867 | "1: movb %1, %0 \n" | |
868 | " xorl %2, %2 \n" | |
1da177e4 | 869 | "2: \n" |
f832ff18 | 870 | _ASM_EXTABLE(1b,2b) |
1da177e4 LT |
871 | :"=m" (*(char *)fix_to_virt(FIX_WP_TEST)), |
872 | "=q" (tmp_reg), | |
873 | "=r" (flag) | |
874 | :"2" (1) | |
875 | :"memory"); | |
8550eb99 | 876 | |
1da177e4 LT |
877 | return flag; |
878 | } | |
879 | ||
63aaf308 | 880 | #ifdef CONFIG_DEBUG_RODATA |
edeed305 AV |
881 | const int rodata_test_data = 0xC3; |
882 | EXPORT_SYMBOL_GPL(rodata_test_data); | |
63aaf308 | 883 | |
502f6604 | 884 | int kernel_set_to_readonly __read_mostly; |
16239630 SR |
885 | |
886 | void set_kernel_text_rw(void) | |
887 | { | |
888 | unsigned long start = PFN_ALIGN(_text); | |
889 | unsigned long size = PFN_ALIGN(_etext) - start; | |
890 | ||
891 | if (!kernel_set_to_readonly) | |
892 | return; | |
893 | ||
894 | pr_debug("Set kernel text: %lx - %lx for read write\n", | |
895 | start, start+size); | |
896 | ||
897 | set_pages_rw(virt_to_page(start), size >> PAGE_SHIFT); | |
898 | } | |
899 | ||
900 | void set_kernel_text_ro(void) | |
901 | { | |
902 | unsigned long start = PFN_ALIGN(_text); | |
903 | unsigned long size = PFN_ALIGN(_etext) - start; | |
904 | ||
905 | if (!kernel_set_to_readonly) | |
906 | return; | |
907 | ||
908 | pr_debug("Set kernel text: %lx - %lx for read only\n", | |
909 | start, start+size); | |
910 | ||
911 | set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT); | |
912 | } | |
913 | ||
5bd5a452 MC |
914 | static void mark_nxdata_nx(void) |
915 | { | |
916 | /* | |
917 | * When this called, init has already been executed and released, | |
0d2eb44f | 918 | * so everything past _etext should be NX. |
5bd5a452 MC |
919 | */ |
920 | unsigned long start = PFN_ALIGN(_etext); | |
921 | /* | |
922 | * This comes from is_kernel_text upper limit. Also HPAGE where used: | |
923 | */ | |
924 | unsigned long size = (((unsigned long)__init_end + HPAGE_SIZE) & HPAGE_MASK) - start; | |
925 | ||
926 | if (__supported_pte_mask & _PAGE_NX) | |
927 | printk(KERN_INFO "NX-protecting the kernel data: %luk\n", size >> 10); | |
928 | set_pages_nx(virt_to_page(start), size >> PAGE_SHIFT); | |
929 | } | |
930 | ||
63aaf308 AV |
931 | void mark_rodata_ro(void) |
932 | { | |
6fb14755 JB |
933 | unsigned long start = PFN_ALIGN(_text); |
934 | unsigned long size = PFN_ALIGN(_etext) - start; | |
63aaf308 | 935 | |
4e4eee0e MD |
936 | set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT); |
937 | printk(KERN_INFO "Write protecting the kernel text: %luk\n", | |
938 | size >> 10); | |
0c42f392 | 939 | |
16239630 SR |
940 | kernel_set_to_readonly = 1; |
941 | ||
0c42f392 | 942 | #ifdef CONFIG_CPA_DEBUG |
4e4eee0e MD |
943 | printk(KERN_INFO "Testing CPA: Reverting %lx-%lx\n", |
944 | start, start+size); | |
945 | set_pages_rw(virt_to_page(start), size>>PAGE_SHIFT); | |
0c42f392 | 946 | |
4e4eee0e MD |
947 | printk(KERN_INFO "Testing CPA: write protecting again\n"); |
948 | set_pages_ro(virt_to_page(start), size>>PAGE_SHIFT); | |
602033ed | 949 | #endif |
8f0f996e | 950 | |
6fb14755 JB |
951 | start += size; |
952 | size = (unsigned long)__end_rodata - start; | |
6d238cc4 | 953 | set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT); |
d7d119d7 IM |
954 | printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n", |
955 | size >> 10); | |
edeed305 | 956 | rodata_test(); |
63aaf308 | 957 | |
0c42f392 | 958 | #ifdef CONFIG_CPA_DEBUG |
d7d119d7 | 959 | printk(KERN_INFO "Testing CPA: undo %lx-%lx\n", start, start + size); |
6d238cc4 | 960 | set_pages_rw(virt_to_page(start), size >> PAGE_SHIFT); |
0c42f392 | 961 | |
d7d119d7 | 962 | printk(KERN_INFO "Testing CPA: write protecting again\n"); |
6d238cc4 | 963 | set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT); |
0c42f392 | 964 | #endif |
5bd5a452 | 965 | mark_nxdata_nx(); |
63aaf308 AV |
966 | } |
967 | #endif | |
968 |