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