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 | |
5c51bdbe YL |
56 | #include "mm_internal.h" |
57 | ||
1da177e4 LT |
58 | unsigned long highstart_pfn, highend_pfn; |
59 | ||
8550eb99 | 60 | static noinline int do_test_wp_bit(void); |
1da177e4 | 61 | |
dc16ecf7 | 62 | bool __read_mostly __vmalloc_start_set = false; |
4e29684c | 63 | |
1da177e4 LT |
64 | /* |
65 | * Creates a middle page table and puts a pointer to it in the | |
66 | * given global directory entry. This only returns the gd entry | |
67 | * in non-PAE compilation mode, since the middle layer is folded. | |
68 | */ | |
69 | static pmd_t * __init one_md_table_init(pgd_t *pgd) | |
70 | { | |
71 | pud_t *pud; | |
72 | pmd_t *pmd_table; | |
8550eb99 | 73 | |
1da177e4 | 74 | #ifdef CONFIG_X86_PAE |
b239fb25 | 75 | if (!(pgd_val(*pgd) & _PAGE_PRESENT)) { |
c464573c | 76 | if (after_bootmem) |
3c1596ef | 77 | pmd_table = (pmd_t *)alloc_bootmem_pages(PAGE_SIZE); |
4e29684c | 78 | else |
d6be89ad | 79 | pmd_table = (pmd_t *)alloc_low_page(); |
6944a9c8 | 80 | paravirt_alloc_pmd(&init_mm, __pa(pmd_table) >> PAGE_SHIFT); |
b239fb25 JF |
81 | set_pgd(pgd, __pgd(__pa(pmd_table) | _PAGE_PRESENT)); |
82 | pud = pud_offset(pgd, 0); | |
8550eb99 | 83 | BUG_ON(pmd_table != pmd_offset(pud, 0)); |
a376f30a Z |
84 | |
85 | return pmd_table; | |
b239fb25 JF |
86 | } |
87 | #endif | |
1da177e4 LT |
88 | pud = pud_offset(pgd, 0); |
89 | pmd_table = pmd_offset(pud, 0); | |
8550eb99 | 90 | |
1da177e4 LT |
91 | return pmd_table; |
92 | } | |
93 | ||
94 | /* | |
95 | * Create a page table and place a pointer to it in a middle page | |
8550eb99 | 96 | * directory entry: |
1da177e4 LT |
97 | */ |
98 | static pte_t * __init one_page_table_init(pmd_t *pmd) | |
99 | { | |
b239fb25 | 100 | if (!(pmd_val(*pmd) & _PAGE_PRESENT)) { |
509a80c4 IM |
101 | pte_t *page_table = NULL; |
102 | ||
c464573c | 103 | if (after_bootmem) { |
f8561296 | 104 | #if defined(CONFIG_DEBUG_PAGEALLOC) || defined(CONFIG_KMEMCHECK) |
4e29684c | 105 | page_table = (pte_t *) alloc_bootmem_pages(PAGE_SIZE); |
509a80c4 | 106 | #endif |
4e29684c YL |
107 | if (!page_table) |
108 | page_table = | |
3c1596ef | 109 | (pte_t *)alloc_bootmem_pages(PAGE_SIZE); |
d6be89ad JB |
110 | } else |
111 | page_table = (pte_t *)alloc_low_page(); | |
b239fb25 | 112 | |
6944a9c8 | 113 | paravirt_alloc_pte(&init_mm, __pa(page_table) >> PAGE_SHIFT); |
1da177e4 | 114 | set_pmd(pmd, __pmd(__pa(page_table) | _PAGE_TABLE)); |
b239fb25 | 115 | BUG_ON(page_table != pte_offset_kernel(pmd, 0)); |
1da177e4 | 116 | } |
509a80c4 | 117 | |
1da177e4 LT |
118 | return pte_offset_kernel(pmd, 0); |
119 | } | |
120 | ||
458a3e64 | 121 | pmd_t * __init populate_extra_pmd(unsigned long vaddr) |
11124411 TH |
122 | { |
123 | int pgd_idx = pgd_index(vaddr); | |
124 | int pmd_idx = pmd_index(vaddr); | |
458a3e64 TH |
125 | |
126 | return one_md_table_init(swapper_pg_dir + pgd_idx) + pmd_idx; | |
127 | } | |
128 | ||
129 | pte_t * __init populate_extra_pte(unsigned long vaddr) | |
130 | { | |
131 | int pte_idx = pte_index(vaddr); | |
11124411 TH |
132 | pmd_t *pmd; |
133 | ||
458a3e64 TH |
134 | pmd = populate_extra_pmd(vaddr); |
135 | return one_page_table_init(pmd) + pte_idx; | |
11124411 TH |
136 | } |
137 | ||
a3c6018e JB |
138 | static pte_t *__init page_table_kmap_check(pte_t *pte, pmd_t *pmd, |
139 | unsigned long vaddr, pte_t *lastpte) | |
140 | { | |
141 | #ifdef CONFIG_HIGHMEM | |
142 | /* | |
143 | * Something (early fixmap) may already have put a pte | |
144 | * page here, which causes the page table allocation | |
145 | * to become nonlinear. Attempt to fix it, and if it | |
146 | * is still nonlinear then we have to bug. | |
147 | */ | |
148 | int pmd_idx_kmap_begin = fix_to_virt(FIX_KMAP_END) >> PMD_SHIFT; | |
149 | int pmd_idx_kmap_end = fix_to_virt(FIX_KMAP_BEGIN) >> PMD_SHIFT; | |
150 | ||
151 | if (pmd_idx_kmap_begin != pmd_idx_kmap_end | |
152 | && (vaddr >> PMD_SHIFT) >= pmd_idx_kmap_begin | |
153 | && (vaddr >> PMD_SHIFT) <= pmd_idx_kmap_end | |
d1b19426 YL |
154 | && ((__pa(pte) >> PAGE_SHIFT) < pgt_buf_start |
155 | || (__pa(pte) >> PAGE_SHIFT) >= pgt_buf_end)) { | |
a3c6018e JB |
156 | pte_t *newpte; |
157 | int i; | |
158 | ||
c464573c | 159 | BUG_ON(after_bootmem); |
a3c6018e JB |
160 | newpte = alloc_low_page(); |
161 | for (i = 0; i < PTRS_PER_PTE; i++) | |
162 | set_pte(newpte + i, pte[i]); | |
163 | ||
164 | paravirt_alloc_pte(&init_mm, __pa(newpte) >> PAGE_SHIFT); | |
165 | set_pmd(pmd, __pmd(__pa(newpte)|_PAGE_TABLE)); | |
166 | BUG_ON(newpte != pte_offset_kernel(pmd, 0)); | |
167 | __flush_tlb_all(); | |
168 | ||
169 | paravirt_release_pte(__pa(pte) >> PAGE_SHIFT); | |
170 | pte = newpte; | |
171 | } | |
172 | BUG_ON(vaddr < fix_to_virt(FIX_KMAP_BEGIN - 1) | |
173 | && vaddr > fix_to_virt(FIX_KMAP_END) | |
174 | && lastpte && lastpte + PTRS_PER_PTE != pte); | |
175 | #endif | |
176 | return pte; | |
177 | } | |
178 | ||
1da177e4 | 179 | /* |
8550eb99 | 180 | * This function initializes a certain range of kernel virtual memory |
1da177e4 LT |
181 | * with new bootmem page tables, everywhere page tables are missing in |
182 | * the given range. | |
8550eb99 IM |
183 | * |
184 | * NOTE: The pagetables are allocated contiguous on the physical space | |
185 | * so we can cache the place of the first one and move around without | |
1da177e4 LT |
186 | * checking the pgd every time. |
187 | */ | |
8550eb99 IM |
188 | static void __init |
189 | page_table_range_init(unsigned long start, unsigned long end, pgd_t *pgd_base) | |
1da177e4 | 190 | { |
1da177e4 LT |
191 | int pgd_idx, pmd_idx; |
192 | unsigned long vaddr; | |
8550eb99 IM |
193 | pgd_t *pgd; |
194 | pmd_t *pmd; | |
a3c6018e | 195 | pte_t *pte = NULL; |
1da177e4 LT |
196 | |
197 | vaddr = start; | |
198 | pgd_idx = pgd_index(vaddr); | |
199 | pmd_idx = pmd_index(vaddr); | |
200 | pgd = pgd_base + pgd_idx; | |
201 | ||
202 | for ( ; (pgd_idx < PTRS_PER_PGD) && (vaddr != end); pgd++, pgd_idx++) { | |
b239fb25 JF |
203 | pmd = one_md_table_init(pgd); |
204 | pmd = pmd + pmd_index(vaddr); | |
8550eb99 IM |
205 | for (; (pmd_idx < PTRS_PER_PMD) && (vaddr != end); |
206 | pmd++, pmd_idx++) { | |
a3c6018e JB |
207 | pte = page_table_kmap_check(one_page_table_init(pmd), |
208 | pmd, vaddr, pte); | |
1da177e4 LT |
209 | |
210 | vaddr += PMD_SIZE; | |
211 | } | |
212 | pmd_idx = 0; | |
213 | } | |
214 | } | |
215 | ||
216 | static inline int is_kernel_text(unsigned long addr) | |
217 | { | |
5bd5a452 | 218 | if (addr >= (unsigned long)_text && addr <= (unsigned long)__init_end) |
1da177e4 LT |
219 | return 1; |
220 | return 0; | |
221 | } | |
222 | ||
223 | /* | |
8550eb99 IM |
224 | * This maps the physical memory to kernel virtual address space, a total |
225 | * of max_low_pfn pages, by creating page tables starting from address | |
226 | * PAGE_OFFSET: | |
1da177e4 | 227 | */ |
e53fb04f PE |
228 | unsigned long __init |
229 | kernel_physical_mapping_init(unsigned long start, | |
230 | unsigned long end, | |
231 | unsigned long page_size_mask) | |
1da177e4 | 232 | { |
e53fb04f | 233 | int use_pse = page_size_mask == (1<<PG_LEVEL_2M); |
c1fd1b43 | 234 | unsigned long last_map_addr = end; |
e53fb04f | 235 | unsigned long start_pfn, end_pfn; |
e7179853 | 236 | pgd_t *pgd_base = swapper_pg_dir; |
8550eb99 | 237 | int pgd_idx, pmd_idx, pte_ofs; |
1da177e4 LT |
238 | unsigned long pfn; |
239 | pgd_t *pgd; | |
240 | pmd_t *pmd; | |
241 | pte_t *pte; | |
a2699e47 SS |
242 | unsigned pages_2m, pages_4k; |
243 | int mapping_iter; | |
244 | ||
e53fb04f PE |
245 | start_pfn = start >> PAGE_SHIFT; |
246 | end_pfn = end >> PAGE_SHIFT; | |
247 | ||
a2699e47 SS |
248 | /* |
249 | * First iteration will setup identity mapping using large/small pages | |
250 | * based on use_pse, with other attributes same as set by | |
251 | * the early code in head_32.S | |
252 | * | |
253 | * Second iteration will setup the appropriate attributes (NX, GLOBAL..) | |
254 | * as desired for the kernel identity mapping. | |
255 | * | |
256 | * This two pass mechanism conforms to the TLB app note which says: | |
257 | * | |
258 | * "Software should not write to a paging-structure entry in a way | |
259 | * that would change, for any linear address, both the page size | |
260 | * and either the page frame or attributes." | |
261 | */ | |
262 | mapping_iter = 1; | |
1da177e4 | 263 | |
a04ad82d YL |
264 | if (!cpu_has_pse) |
265 | use_pse = 0; | |
1da177e4 | 266 | |
a2699e47 SS |
267 | repeat: |
268 | pages_2m = pages_4k = 0; | |
a04ad82d YL |
269 | pfn = start_pfn; |
270 | pgd_idx = pgd_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET); | |
271 | pgd = pgd_base + pgd_idx; | |
1da177e4 LT |
272 | for (; pgd_idx < PTRS_PER_PGD; pgd++, pgd_idx++) { |
273 | pmd = one_md_table_init(pgd); | |
8550eb99 | 274 | |
a04ad82d YL |
275 | if (pfn >= end_pfn) |
276 | continue; | |
277 | #ifdef CONFIG_X86_PAE | |
278 | pmd_idx = pmd_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET); | |
279 | pmd += pmd_idx; | |
280 | #else | |
281 | pmd_idx = 0; | |
282 | #endif | |
283 | for (; pmd_idx < PTRS_PER_PMD && pfn < end_pfn; | |
f3f20de8 | 284 | pmd++, pmd_idx++) { |
8550eb99 | 285 | unsigned int addr = pfn * PAGE_SIZE + PAGE_OFFSET; |
1da177e4 | 286 | |
8550eb99 IM |
287 | /* |
288 | * Map with big pages if possible, otherwise | |
289 | * create normal page tables: | |
290 | */ | |
a04ad82d | 291 | if (use_pse) { |
8550eb99 | 292 | unsigned int addr2; |
f3f20de8 | 293 | pgprot_t prot = PAGE_KERNEL_LARGE; |
a2699e47 SS |
294 | /* |
295 | * first pass will use the same initial | |
296 | * identity mapping attribute + _PAGE_PSE. | |
297 | */ | |
298 | pgprot_t init_prot = | |
299 | __pgprot(PTE_IDENT_ATTR | | |
300 | _PAGE_PSE); | |
f3f20de8 | 301 | |
960ddb4f | 302 | pfn &= PMD_MASK >> PAGE_SHIFT; |
8550eb99 | 303 | addr2 = (pfn + PTRS_PER_PTE-1) * PAGE_SIZE + |
f3f20de8 JF |
304 | PAGE_OFFSET + PAGE_SIZE-1; |
305 | ||
8550eb99 IM |
306 | if (is_kernel_text(addr) || |
307 | is_kernel_text(addr2)) | |
f3f20de8 JF |
308 | prot = PAGE_KERNEL_LARGE_EXEC; |
309 | ||
ce0c0e50 | 310 | pages_2m++; |
a2699e47 SS |
311 | if (mapping_iter == 1) |
312 | set_pmd(pmd, pfn_pmd(pfn, init_prot)); | |
313 | else | |
314 | set_pmd(pmd, pfn_pmd(pfn, prot)); | |
b239fb25 | 315 | |
1da177e4 | 316 | pfn += PTRS_PER_PTE; |
8550eb99 IM |
317 | continue; |
318 | } | |
319 | pte = one_page_table_init(pmd); | |
1da177e4 | 320 | |
a04ad82d YL |
321 | pte_ofs = pte_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET); |
322 | pte += pte_ofs; | |
323 | for (; pte_ofs < PTRS_PER_PTE && pfn < end_pfn; | |
8550eb99 IM |
324 | pte++, pfn++, pte_ofs++, addr += PAGE_SIZE) { |
325 | pgprot_t prot = PAGE_KERNEL; | |
a2699e47 SS |
326 | /* |
327 | * first pass will use the same initial | |
328 | * identity mapping attribute. | |
329 | */ | |
330 | pgprot_t init_prot = __pgprot(PTE_IDENT_ATTR); | |
f3f20de8 | 331 | |
8550eb99 IM |
332 | if (is_kernel_text(addr)) |
333 | prot = PAGE_KERNEL_EXEC; | |
f3f20de8 | 334 | |
ce0c0e50 | 335 | pages_4k++; |
c1fd1b43 | 336 | if (mapping_iter == 1) { |
a2699e47 | 337 | set_pte(pte, pfn_pte(pfn, init_prot)); |
c1fd1b43 PE |
338 | last_map_addr = (pfn << PAGE_SHIFT) + PAGE_SIZE; |
339 | } else | |
a2699e47 | 340 | set_pte(pte, pfn_pte(pfn, prot)); |
1da177e4 LT |
341 | } |
342 | } | |
343 | } | |
a2699e47 SS |
344 | if (mapping_iter == 1) { |
345 | /* | |
346 | * update direct mapping page count only in the first | |
347 | * iteration. | |
348 | */ | |
349 | update_page_count(PG_LEVEL_2M, pages_2m); | |
350 | update_page_count(PG_LEVEL_4K, pages_4k); | |
351 | ||
352 | /* | |
353 | * local global flush tlb, which will flush the previous | |
354 | * mappings present in both small and large page TLB's. | |
355 | */ | |
356 | __flush_tlb_all(); | |
357 | ||
358 | /* | |
359 | * Second iteration will set the actual desired PTE attributes. | |
360 | */ | |
361 | mapping_iter = 2; | |
362 | goto repeat; | |
363 | } | |
c1fd1b43 | 364 | return last_map_addr; |
ae531c26 AV |
365 | } |
366 | ||
1da177e4 LT |
367 | pte_t *kmap_pte; |
368 | pgprot_t kmap_prot; | |
369 | ||
8550eb99 IM |
370 | static inline pte_t *kmap_get_fixmap_pte(unsigned long vaddr) |
371 | { | |
372 | return pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), | |
373 | vaddr), vaddr), vaddr); | |
374 | } | |
1da177e4 LT |
375 | |
376 | static void __init kmap_init(void) | |
377 | { | |
378 | unsigned long kmap_vstart; | |
379 | ||
8550eb99 IM |
380 | /* |
381 | * Cache the first kmap pte: | |
382 | */ | |
1da177e4 LT |
383 | kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN); |
384 | kmap_pte = kmap_get_fixmap_pte(kmap_vstart); | |
385 | ||
386 | kmap_prot = PAGE_KERNEL; | |
387 | } | |
388 | ||
fd940934 | 389 | #ifdef CONFIG_HIGHMEM |
1da177e4 LT |
390 | static void __init permanent_kmaps_init(pgd_t *pgd_base) |
391 | { | |
8550eb99 | 392 | unsigned long vaddr; |
1da177e4 LT |
393 | pgd_t *pgd; |
394 | pud_t *pud; | |
395 | pmd_t *pmd; | |
396 | pte_t *pte; | |
1da177e4 LT |
397 | |
398 | vaddr = PKMAP_BASE; | |
399 | page_table_range_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base); | |
400 | ||
401 | pgd = swapper_pg_dir + pgd_index(vaddr); | |
402 | pud = pud_offset(pgd, vaddr); | |
403 | pmd = pmd_offset(pud, vaddr); | |
404 | pte = pte_offset_kernel(pmd, vaddr); | |
8550eb99 | 405 | pkmap_page_table = pte; |
1da177e4 LT |
406 | } |
407 | ||
b1258ac2 | 408 | static void __init add_one_highpage_init(struct page *page) |
1da177e4 | 409 | { |
cc9f7a0c YL |
410 | ClearPageReserved(page); |
411 | init_page_count(page); | |
412 | __free_page(page); | |
413 | totalhigh_pages++; | |
1da177e4 LT |
414 | } |
415 | ||
1d931264 YL |
416 | void __init add_highpages_with_active_regions(int nid, |
417 | unsigned long start_pfn, unsigned long end_pfn) | |
1da177e4 | 418 | { |
8a9ca34c TH |
419 | phys_addr_t start, end; |
420 | u64 i; | |
421 | ||
422 | for_each_free_mem_range(i, nid, &start, &end, NULL) { | |
423 | unsigned long pfn = clamp_t(unsigned long, PFN_UP(start), | |
424 | start_pfn, end_pfn); | |
425 | unsigned long e_pfn = clamp_t(unsigned long, PFN_DOWN(end), | |
426 | start_pfn, end_pfn); | |
427 | for ( ; pfn < e_pfn; pfn++) | |
428 | if (pfn_valid(pfn)) | |
429 | add_one_highpage_init(pfn_to_page(pfn)); | |
23be8c7d | 430 | } |
b5bc6c0e | 431 | } |
1da177e4 | 432 | #else |
e8e32326 IB |
433 | static inline void permanent_kmaps_init(pgd_t *pgd_base) |
434 | { | |
435 | } | |
1da177e4 LT |
436 | #endif /* CONFIG_HIGHMEM */ |
437 | ||
7737b215 | 438 | void __init native_pagetable_init(void) |
1da177e4 | 439 | { |
551889a6 | 440 | unsigned long pfn, va; |
73090f89 | 441 | pgd_t *pgd, *base = swapper_pg_dir; |
551889a6 IC |
442 | pud_t *pud; |
443 | pmd_t *pmd; | |
444 | pte_t *pte; | |
b239fb25 JF |
445 | |
446 | /* | |
551889a6 IC |
447 | * Remove any mappings which extend past the end of physical |
448 | * memory from the boot time page table: | |
b239fb25 | 449 | */ |
551889a6 IC |
450 | for (pfn = max_low_pfn + 1; pfn < 1<<(32-PAGE_SHIFT); pfn++) { |
451 | va = PAGE_OFFSET + (pfn<<PAGE_SHIFT); | |
452 | pgd = base + pgd_index(va); | |
453 | if (!pgd_present(*pgd)) | |
454 | break; | |
455 | ||
456 | pud = pud_offset(pgd, va); | |
457 | pmd = pmd_offset(pud, va); | |
458 | if (!pmd_present(*pmd)) | |
459 | break; | |
460 | ||
461 | pte = pte_offset_kernel(pmd, va); | |
462 | if (!pte_present(*pte)) | |
463 | break; | |
464 | ||
465 | pte_clear(NULL, va, pte); | |
466 | } | |
6944a9c8 | 467 | paravirt_alloc_pmd(&init_mm, __pa(base) >> PAGE_SHIFT); |
843b8ed2 | 468 | paging_init(); |
b239fb25 JF |
469 | } |
470 | ||
b239fb25 JF |
471 | /* |
472 | * Build a proper pagetable for the kernel mappings. Up until this | |
473 | * point, we've been running on some set of pagetables constructed by | |
474 | * the boot process. | |
475 | * | |
476 | * If we're booting on native hardware, this will be a pagetable | |
551889a6 IC |
477 | * constructed in arch/x86/kernel/head_32.S. The root of the |
478 | * pagetable will be swapper_pg_dir. | |
b239fb25 JF |
479 | * |
480 | * If we're booting paravirtualized under a hypervisor, then there are | |
481 | * more options: we may already be running PAE, and the pagetable may | |
482 | * or may not be based in swapper_pg_dir. In any case, | |
7737b215 | 483 | * paravirt_pagetable_init() will set up swapper_pg_dir |
b239fb25 JF |
484 | * appropriately for the rest of the initialization to work. |
485 | * | |
486 | * In general, pagetable_init() assumes that the pagetable may already | |
487 | * be partially populated, and so it avoids stomping on any existing | |
488 | * mappings. | |
489 | */ | |
f765090a | 490 | void __init early_ioremap_page_table_range_init(void) |
b239fb25 | 491 | { |
e7179853 | 492 | pgd_t *pgd_base = swapper_pg_dir; |
8550eb99 | 493 | unsigned long vaddr, end; |
b239fb25 | 494 | |
1da177e4 LT |
495 | /* |
496 | * Fixed mappings, only the page table structure has to be | |
497 | * created - mappings will be set by set_fixmap(): | |
498 | */ | |
499 | vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK; | |
b239fb25 JF |
500 | end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK; |
501 | page_table_range_init(vaddr, end, pgd_base); | |
beacfaac | 502 | early_ioremap_reset(); |
e7b37895 YL |
503 | } |
504 | ||
505 | static void __init pagetable_init(void) | |
506 | { | |
507 | pgd_t *pgd_base = swapper_pg_dir; | |
508 | ||
1da177e4 | 509 | permanent_kmaps_init(pgd_base); |
1da177e4 LT |
510 | } |
511 | ||
be43d728 | 512 | pteval_t __supported_pte_mask __read_mostly = ~(_PAGE_NX | _PAGE_GLOBAL | _PAGE_IOMAP); |
6fdc05d4 JF |
513 | EXPORT_SYMBOL_GPL(__supported_pte_mask); |
514 | ||
90d967e0 YL |
515 | /* user-defined highmem size */ |
516 | static unsigned int highmem_pages = -1; | |
517 | ||
518 | /* | |
519 | * highmem=size forces highmem to be exactly 'size' bytes. | |
520 | * This works even on boxes that have no highmem otherwise. | |
521 | * This also works to reduce highmem size on bigger boxes. | |
522 | */ | |
523 | static int __init parse_highmem(char *arg) | |
524 | { | |
525 | if (!arg) | |
526 | return -EINVAL; | |
527 | ||
528 | highmem_pages = memparse(arg, &arg) >> PAGE_SHIFT; | |
529 | return 0; | |
530 | } | |
531 | early_param("highmem", parse_highmem); | |
532 | ||
4769843b IM |
533 | #define MSG_HIGHMEM_TOO_BIG \ |
534 | "highmem size (%luMB) is bigger than pages available (%luMB)!\n" | |
535 | ||
536 | #define MSG_LOWMEM_TOO_SMALL \ | |
537 | "highmem size (%luMB) results in <64MB lowmem, ignoring it!\n" | |
90d967e0 | 538 | /* |
4769843b IM |
539 | * All of RAM fits into lowmem - but if user wants highmem |
540 | * artificially via the highmem=x boot parameter then create | |
541 | * it: | |
90d967e0 | 542 | */ |
4769843b | 543 | void __init lowmem_pfn_init(void) |
90d967e0 | 544 | { |
346cafec | 545 | /* max_low_pfn is 0, we already have early_res support */ |
90d967e0 | 546 | max_low_pfn = max_pfn; |
d88316c2 | 547 | |
4769843b IM |
548 | if (highmem_pages == -1) |
549 | highmem_pages = 0; | |
550 | #ifdef CONFIG_HIGHMEM | |
551 | if (highmem_pages >= max_pfn) { | |
552 | printk(KERN_ERR MSG_HIGHMEM_TOO_BIG, | |
553 | pages_to_mb(highmem_pages), pages_to_mb(max_pfn)); | |
554 | highmem_pages = 0; | |
555 | } | |
556 | if (highmem_pages) { | |
557 | if (max_low_pfn - highmem_pages < 64*1024*1024/PAGE_SIZE) { | |
558 | printk(KERN_ERR MSG_LOWMEM_TOO_SMALL, | |
90d967e0 YL |
559 | pages_to_mb(highmem_pages)); |
560 | highmem_pages = 0; | |
561 | } | |
4769843b IM |
562 | max_low_pfn -= highmem_pages; |
563 | } | |
564 | #else | |
565 | if (highmem_pages) | |
566 | printk(KERN_ERR "ignoring highmem size on non-highmem kernel!\n"); | |
567 | #endif | |
568 | } | |
569 | ||
570 | #define MSG_HIGHMEM_TOO_SMALL \ | |
571 | "only %luMB highmem pages available, ignoring highmem size of %luMB!\n" | |
572 | ||
573 | #define MSG_HIGHMEM_TRIMMED \ | |
574 | "Warning: only 4GB will be used. Use a HIGHMEM64G enabled kernel!\n" | |
575 | /* | |
576 | * We have more RAM than fits into lowmem - we try to put it into | |
577 | * highmem, also taking the highmem=x boot parameter into account: | |
578 | */ | |
579 | void __init highmem_pfn_init(void) | |
580 | { | |
d88316c2 IM |
581 | max_low_pfn = MAXMEM_PFN; |
582 | ||
4769843b IM |
583 | if (highmem_pages == -1) |
584 | highmem_pages = max_pfn - MAXMEM_PFN; | |
585 | ||
586 | if (highmem_pages + MAXMEM_PFN < max_pfn) | |
587 | max_pfn = MAXMEM_PFN + highmem_pages; | |
588 | ||
589 | if (highmem_pages + MAXMEM_PFN > max_pfn) { | |
590 | printk(KERN_WARNING MSG_HIGHMEM_TOO_SMALL, | |
591 | pages_to_mb(max_pfn - MAXMEM_PFN), | |
592 | pages_to_mb(highmem_pages)); | |
593 | highmem_pages = 0; | |
594 | } | |
90d967e0 | 595 | #ifndef CONFIG_HIGHMEM |
4769843b IM |
596 | /* Maximum memory usable is what is directly addressable */ |
597 | printk(KERN_WARNING "Warning only %ldMB will be used.\n", MAXMEM>>20); | |
598 | if (max_pfn > MAX_NONPAE_PFN) | |
599 | printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n"); | |
600 | else | |
601 | printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n"); | |
602 | max_pfn = MAXMEM_PFN; | |
90d967e0 YL |
603 | #else /* !CONFIG_HIGHMEM */ |
604 | #ifndef CONFIG_HIGHMEM64G | |
4769843b IM |
605 | if (max_pfn > MAX_NONPAE_PFN) { |
606 | max_pfn = MAX_NONPAE_PFN; | |
607 | printk(KERN_WARNING MSG_HIGHMEM_TRIMMED); | |
608 | } | |
90d967e0 YL |
609 | #endif /* !CONFIG_HIGHMEM64G */ |
610 | #endif /* !CONFIG_HIGHMEM */ | |
4769843b IM |
611 | } |
612 | ||
613 | /* | |
614 | * Determine low and high memory ranges: | |
615 | */ | |
616 | void __init find_low_pfn_range(void) | |
617 | { | |
618 | /* it could update max_pfn */ | |
619 | ||
d88316c2 | 620 | if (max_pfn <= MAXMEM_PFN) |
4769843b | 621 | lowmem_pfn_init(); |
d88316c2 IM |
622 | else |
623 | highmem_pfn_init(); | |
90d967e0 YL |
624 | } |
625 | ||
b2ac82a0 | 626 | #ifndef CONFIG_NEED_MULTIPLE_NODES |
d8fc3afc | 627 | void __init initmem_init(void) |
b2ac82a0 | 628 | { |
b2ac82a0 YL |
629 | #ifdef CONFIG_HIGHMEM |
630 | highstart_pfn = highend_pfn = max_pfn; | |
631 | if (max_pfn > max_low_pfn) | |
632 | highstart_pfn = max_low_pfn; | |
b2ac82a0 YL |
633 | printk(KERN_NOTICE "%ldMB HIGHMEM available.\n", |
634 | pages_to_mb(highend_pfn - highstart_pfn)); | |
635 | num_physpages = highend_pfn; | |
636 | high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1; | |
637 | #else | |
b2ac82a0 YL |
638 | num_physpages = max_low_pfn; |
639 | high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1; | |
640 | #endif | |
0608f70c TH |
641 | |
642 | memblock_set_node(0, (phys_addr_t)ULLONG_MAX, 0); | |
643 | sparse_memory_present_with_active_regions(0); | |
644 | ||
b2ac82a0 YL |
645 | #ifdef CONFIG_FLATMEM |
646 | max_mapnr = num_physpages; | |
647 | #endif | |
dc16ecf7 JF |
648 | __vmalloc_start_set = true; |
649 | ||
b2ac82a0 YL |
650 | printk(KERN_NOTICE "%ldMB LOWMEM available.\n", |
651 | pages_to_mb(max_low_pfn)); | |
652 | ||
653 | setup_bootmem_allocator(); | |
b2ac82a0 | 654 | } |
cb95a13a | 655 | #endif /* !CONFIG_NEED_MULTIPLE_NODES */ |
b2ac82a0 | 656 | |
b2ac82a0 YL |
657 | void __init setup_bootmem_allocator(void) |
658 | { | |
b2ac82a0 YL |
659 | printk(KERN_INFO " mapped low ram: 0 - %08lx\n", |
660 | max_pfn_mapped<<PAGE_SHIFT); | |
fc5efe39 | 661 | printk(KERN_INFO " low ram: 0 - %08lx\n", max_low_pfn<<PAGE_SHIFT); |
7482b0e9 | 662 | |
c464573c | 663 | after_bootmem = 1; |
4e29684c YL |
664 | } |
665 | ||
1da177e4 LT |
666 | /* |
667 | * paging_init() sets up the page tables - note that the first 8MB are | |
668 | * already mapped by head.S. | |
669 | * | |
670 | * This routines also unmaps the page at virtual kernel address 0, so | |
671 | * that we can trap those pesky NULL-reference errors in the kernel. | |
672 | */ | |
673 | void __init paging_init(void) | |
674 | { | |
1da177e4 LT |
675 | pagetable_init(); |
676 | ||
1da177e4 LT |
677 | __flush_tlb_all(); |
678 | ||
679 | kmap_init(); | |
11cd0bc1 YL |
680 | |
681 | /* | |
682 | * NOTE: at this point the bootmem allocator is fully available. | |
683 | */ | |
c10d1e26 | 684 | olpc_dt_build_devicetree(); |
797390d8 | 685 | sparse_memory_present_with_active_regions(MAX_NUMNODES); |
11cd0bc1 YL |
686 | sparse_init(); |
687 | zone_sizes_init(); | |
1da177e4 LT |
688 | } |
689 | ||
690 | /* | |
691 | * Test if the WP bit works in supervisor mode. It isn't supported on 386's | |
f7f17a67 DV |
692 | * and also on some strange 486's. All 586+'s are OK. This used to involve |
693 | * black magic jumps to work around some nasty CPU bugs, but fortunately the | |
694 | * switch to using exceptions got rid of all that. | |
1da177e4 | 695 | */ |
1da177e4 LT |
696 | static void __init test_wp_bit(void) |
697 | { | |
d7d119d7 IM |
698 | printk(KERN_INFO |
699 | "Checking if this processor honours the WP bit even in supervisor mode..."); | |
1da177e4 LT |
700 | |
701 | /* Any page-aligned address will do, the test is non-destructive */ | |
8bd753be | 702 | __set_fixmap(FIX_WP_TEST, __pa(&swapper_pg_dir), PAGE_KERNEL_RO); |
1da177e4 LT |
703 | boot_cpu_data.wp_works_ok = do_test_wp_bit(); |
704 | clear_fixmap(FIX_WP_TEST); | |
705 | ||
706 | if (!boot_cpu_data.wp_works_ok) { | |
d7d119d7 | 707 | printk(KERN_CONT "No.\n"); |
1da177e4 | 708 | #ifdef CONFIG_X86_WP_WORKS_OK |
d7d119d7 IM |
709 | panic( |
710 | "This kernel doesn't support CPU's with broken WP. Recompile it for a 386!"); | |
1da177e4 LT |
711 | #endif |
712 | } else { | |
d7d119d7 | 713 | printk(KERN_CONT "Ok.\n"); |
1da177e4 LT |
714 | } |
715 | } | |
716 | ||
1da177e4 LT |
717 | void __init mem_init(void) |
718 | { | |
1da177e4 | 719 | int codesize, reservedpages, datasize, initsize; |
cc9f7a0c | 720 | int tmp; |
1da177e4 | 721 | |
cfb80c9e JF |
722 | pci_iommu_alloc(); |
723 | ||
05b79bdc | 724 | #ifdef CONFIG_FLATMEM |
8d8f3cbe | 725 | BUG_ON(!mem_map); |
1da177e4 | 726 | #endif |
855c743a SG |
727 | /* |
728 | * With CONFIG_DEBUG_PAGEALLOC initialization of highmem pages has to | |
729 | * be done before free_all_bootmem(). Memblock use free low memory for | |
730 | * temporary data (see find_range_array()) and for this purpose can use | |
731 | * pages that was already passed to the buddy allocator, hence marked as | |
732 | * not accessible in the page tables when compiled with | |
733 | * CONFIG_DEBUG_PAGEALLOC. Otherwise order of initialization is not | |
734 | * important here. | |
735 | */ | |
736 | set_highmem_pages_init(); | |
737 | ||
1da177e4 LT |
738 | /* this will put all low memory onto the freelists */ |
739 | totalram_pages += free_all_bootmem(); | |
740 | ||
741 | reservedpages = 0; | |
742 | for (tmp = 0; tmp < max_low_pfn; tmp++) | |
743 | /* | |
8550eb99 | 744 | * Only count reserved RAM pages: |
1da177e4 LT |
745 | */ |
746 | if (page_is_ram(tmp) && PageReserved(pfn_to_page(tmp))) | |
747 | reservedpages++; | |
748 | ||
1da177e4 LT |
749 | codesize = (unsigned long) &_etext - (unsigned long) &_text; |
750 | datasize = (unsigned long) &_edata - (unsigned long) &_etext; | |
751 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; | |
752 | ||
8550eb99 IM |
753 | printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, " |
754 | "%dk reserved, %dk data, %dk init, %ldk highmem)\n", | |
cc013a88 | 755 | nr_free_pages() << (PAGE_SHIFT-10), |
1da177e4 LT |
756 | num_physpages << (PAGE_SHIFT-10), |
757 | codesize >> 10, | |
758 | reservedpages << (PAGE_SHIFT-10), | |
759 | datasize >> 10, | |
760 | initsize >> 10, | |
4b529401 | 761 | totalhigh_pages << (PAGE_SHIFT-10)); |
1da177e4 | 762 | |
d7d119d7 | 763 | printk(KERN_INFO "virtual kernel memory layout:\n" |
8550eb99 | 764 | " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" |
052e7994 | 765 | #ifdef CONFIG_HIGHMEM |
8550eb99 | 766 | " pkmap : 0x%08lx - 0x%08lx (%4ld kB)\n" |
052e7994 | 767 | #endif |
8550eb99 IM |
768 | " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" |
769 | " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
770 | " .init : 0x%08lx - 0x%08lx (%4ld kB)\n" | |
771 | " .data : 0x%08lx - 0x%08lx (%4ld kB)\n" | |
772 | " .text : 0x%08lx - 0x%08lx (%4ld kB)\n", | |
773 | FIXADDR_START, FIXADDR_TOP, | |
774 | (FIXADDR_TOP - FIXADDR_START) >> 10, | |
052e7994 JF |
775 | |
776 | #ifdef CONFIG_HIGHMEM | |
8550eb99 IM |
777 | PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE, |
778 | (LAST_PKMAP*PAGE_SIZE) >> 10, | |
052e7994 JF |
779 | #endif |
780 | ||
8550eb99 IM |
781 | VMALLOC_START, VMALLOC_END, |
782 | (VMALLOC_END - VMALLOC_START) >> 20, | |
052e7994 | 783 | |
8550eb99 IM |
784 | (unsigned long)__va(0), (unsigned long)high_memory, |
785 | ((unsigned long)high_memory - (unsigned long)__va(0)) >> 20, | |
052e7994 | 786 | |
8550eb99 IM |
787 | (unsigned long)&__init_begin, (unsigned long)&__init_end, |
788 | ((unsigned long)&__init_end - | |
789 | (unsigned long)&__init_begin) >> 10, | |
052e7994 | 790 | |
8550eb99 IM |
791 | (unsigned long)&_etext, (unsigned long)&_edata, |
792 | ((unsigned long)&_edata - (unsigned long)&_etext) >> 10, | |
052e7994 | 793 | |
8550eb99 IM |
794 | (unsigned long)&_text, (unsigned long)&_etext, |
795 | ((unsigned long)&_etext - (unsigned long)&_text) >> 10); | |
052e7994 | 796 | |
beeb4195 JB |
797 | /* |
798 | * Check boundaries twice: Some fundamental inconsistencies can | |
799 | * be detected at build time already. | |
800 | */ | |
801 | #define __FIXADDR_TOP (-PAGE_SIZE) | |
802 | #ifdef CONFIG_HIGHMEM | |
803 | BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP*PAGE_SIZE > FIXADDR_START); | |
804 | BUILD_BUG_ON(VMALLOC_END > PKMAP_BASE); | |
805 | #endif | |
806 | #define high_memory (-128UL << 20) | |
807 | BUILD_BUG_ON(VMALLOC_START >= VMALLOC_END); | |
808 | #undef high_memory | |
809 | #undef __FIXADDR_TOP | |
810 | ||
052e7994 | 811 | #ifdef CONFIG_HIGHMEM |
8550eb99 IM |
812 | BUG_ON(PKMAP_BASE + LAST_PKMAP*PAGE_SIZE > FIXADDR_START); |
813 | BUG_ON(VMALLOC_END > PKMAP_BASE); | |
052e7994 | 814 | #endif |
beeb4195 | 815 | BUG_ON(VMALLOC_START >= VMALLOC_END); |
8550eb99 | 816 | BUG_ON((unsigned long)high_memory > VMALLOC_START); |
052e7994 | 817 | |
1da177e4 LT |
818 | if (boot_cpu_data.wp_works_ok < 0) |
819 | test_wp_bit(); | |
1da177e4 LT |
820 | } |
821 | ||
ad8f5797 | 822 | #ifdef CONFIG_MEMORY_HOTPLUG |
bc02af93 | 823 | int arch_add_memory(int nid, u64 start, u64 size) |
05039b92 | 824 | { |
7c7e9425 | 825 | struct pglist_data *pgdata = NODE_DATA(nid); |
776ed98b | 826 | struct zone *zone = pgdata->node_zones + ZONE_HIGHMEM; |
05039b92 DH |
827 | unsigned long start_pfn = start >> PAGE_SHIFT; |
828 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
829 | ||
c04fc586 | 830 | return __add_pages(nid, zone, start_pfn, nr_pages); |
05039b92 | 831 | } |
9d99aaa3 | 832 | #endif |
05039b92 | 833 | |
1da177e4 LT |
834 | /* |
835 | * This function cannot be __init, since exceptions don't work in that | |
836 | * section. Put this after the callers, so that it cannot be inlined. | |
837 | */ | |
8550eb99 | 838 | static noinline int do_test_wp_bit(void) |
1da177e4 LT |
839 | { |
840 | char tmp_reg; | |
841 | int flag; | |
842 | ||
843 | __asm__ __volatile__( | |
8550eb99 IM |
844 | " movb %0, %1 \n" |
845 | "1: movb %1, %0 \n" | |
846 | " xorl %2, %2 \n" | |
1da177e4 | 847 | "2: \n" |
f832ff18 | 848 | _ASM_EXTABLE(1b,2b) |
1da177e4 LT |
849 | :"=m" (*(char *)fix_to_virt(FIX_WP_TEST)), |
850 | "=q" (tmp_reg), | |
851 | "=r" (flag) | |
852 | :"2" (1) | |
853 | :"memory"); | |
8550eb99 | 854 | |
1da177e4 LT |
855 | return flag; |
856 | } | |
857 | ||
63aaf308 | 858 | #ifdef CONFIG_DEBUG_RODATA |
edeed305 AV |
859 | const int rodata_test_data = 0xC3; |
860 | EXPORT_SYMBOL_GPL(rodata_test_data); | |
63aaf308 | 861 | |
502f6604 | 862 | int kernel_set_to_readonly __read_mostly; |
16239630 SR |
863 | |
864 | void set_kernel_text_rw(void) | |
865 | { | |
866 | unsigned long start = PFN_ALIGN(_text); | |
867 | unsigned long size = PFN_ALIGN(_etext) - start; | |
868 | ||
869 | if (!kernel_set_to_readonly) | |
870 | return; | |
871 | ||
872 | pr_debug("Set kernel text: %lx - %lx for read write\n", | |
873 | start, start+size); | |
874 | ||
875 | set_pages_rw(virt_to_page(start), size >> PAGE_SHIFT); | |
876 | } | |
877 | ||
878 | void set_kernel_text_ro(void) | |
879 | { | |
880 | unsigned long start = PFN_ALIGN(_text); | |
881 | unsigned long size = PFN_ALIGN(_etext) - start; | |
882 | ||
883 | if (!kernel_set_to_readonly) | |
884 | return; | |
885 | ||
886 | pr_debug("Set kernel text: %lx - %lx for read only\n", | |
887 | start, start+size); | |
888 | ||
889 | set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT); | |
890 | } | |
891 | ||
5bd5a452 MC |
892 | static void mark_nxdata_nx(void) |
893 | { | |
894 | /* | |
895 | * When this called, init has already been executed and released, | |
0d2eb44f | 896 | * so everything past _etext should be NX. |
5bd5a452 MC |
897 | */ |
898 | unsigned long start = PFN_ALIGN(_etext); | |
899 | /* | |
900 | * This comes from is_kernel_text upper limit. Also HPAGE where used: | |
901 | */ | |
902 | unsigned long size = (((unsigned long)__init_end + HPAGE_SIZE) & HPAGE_MASK) - start; | |
903 | ||
904 | if (__supported_pte_mask & _PAGE_NX) | |
905 | printk(KERN_INFO "NX-protecting the kernel data: %luk\n", size >> 10); | |
906 | set_pages_nx(virt_to_page(start), size >> PAGE_SHIFT); | |
907 | } | |
908 | ||
63aaf308 AV |
909 | void mark_rodata_ro(void) |
910 | { | |
6fb14755 JB |
911 | unsigned long start = PFN_ALIGN(_text); |
912 | unsigned long size = PFN_ALIGN(_etext) - start; | |
63aaf308 | 913 | |
4e4eee0e MD |
914 | set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT); |
915 | printk(KERN_INFO "Write protecting the kernel text: %luk\n", | |
916 | size >> 10); | |
0c42f392 | 917 | |
16239630 SR |
918 | kernel_set_to_readonly = 1; |
919 | ||
0c42f392 | 920 | #ifdef CONFIG_CPA_DEBUG |
4e4eee0e MD |
921 | printk(KERN_INFO "Testing CPA: Reverting %lx-%lx\n", |
922 | start, start+size); | |
923 | set_pages_rw(virt_to_page(start), size>>PAGE_SHIFT); | |
0c42f392 | 924 | |
4e4eee0e MD |
925 | printk(KERN_INFO "Testing CPA: write protecting again\n"); |
926 | set_pages_ro(virt_to_page(start), size>>PAGE_SHIFT); | |
602033ed | 927 | #endif |
8f0f996e | 928 | |
6fb14755 JB |
929 | start += size; |
930 | size = (unsigned long)__end_rodata - start; | |
6d238cc4 | 931 | set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT); |
d7d119d7 IM |
932 | printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n", |
933 | size >> 10); | |
edeed305 | 934 | rodata_test(); |
63aaf308 | 935 | |
0c42f392 | 936 | #ifdef CONFIG_CPA_DEBUG |
d7d119d7 | 937 | printk(KERN_INFO "Testing CPA: undo %lx-%lx\n", start, start + size); |
6d238cc4 | 938 | set_pages_rw(virt_to_page(start), size >> PAGE_SHIFT); |
0c42f392 | 939 | |
d7d119d7 | 940 | printk(KERN_INFO "Testing CPA: write protecting again\n"); |
6d238cc4 | 941 | set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT); |
0c42f392 | 942 | #endif |
5bd5a452 | 943 | mark_nxdata_nx(); |
63aaf308 AV |
944 | } |
945 | #endif | |
946 |