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)) { |
4e37a890 | 76 | pmd_table = (pmd_t *)alloc_low_page(); |
6944a9c8 | 77 | paravirt_alloc_pmd(&init_mm, __pa(pmd_table) >> PAGE_SHIFT); |
b239fb25 JF |
78 | set_pgd(pgd, __pgd(__pa(pmd_table) | _PAGE_PRESENT)); |
79 | pud = pud_offset(pgd, 0); | |
8550eb99 | 80 | BUG_ON(pmd_table != pmd_offset(pud, 0)); |
a376f30a Z |
81 | |
82 | return pmd_table; | |
b239fb25 JF |
83 | } |
84 | #endif | |
1da177e4 LT |
85 | pud = pud_offset(pgd, 0); |
86 | pmd_table = pmd_offset(pud, 0); | |
8550eb99 | 87 | |
1da177e4 LT |
88 | return pmd_table; |
89 | } | |
90 | ||
91 | /* | |
92 | * Create a page table and place a pointer to it in a middle page | |
8550eb99 | 93 | * directory entry: |
1da177e4 LT |
94 | */ |
95 | static pte_t * __init one_page_table_init(pmd_t *pmd) | |
96 | { | |
b239fb25 | 97 | if (!(pmd_val(*pmd) & _PAGE_PRESENT)) { |
4e37a890 | 98 | pte_t *page_table = (pte_t *)alloc_low_page(); |
b239fb25 | 99 | |
6944a9c8 | 100 | paravirt_alloc_pte(&init_mm, __pa(page_table) >> PAGE_SHIFT); |
1da177e4 | 101 | set_pmd(pmd, __pmd(__pa(page_table) | _PAGE_TABLE)); |
b239fb25 | 102 | BUG_ON(page_table != pte_offset_kernel(pmd, 0)); |
1da177e4 | 103 | } |
509a80c4 | 104 | |
1da177e4 LT |
105 | return pte_offset_kernel(pmd, 0); |
106 | } | |
107 | ||
458a3e64 | 108 | pmd_t * __init populate_extra_pmd(unsigned long vaddr) |
11124411 TH |
109 | { |
110 | int pgd_idx = pgd_index(vaddr); | |
111 | int pmd_idx = pmd_index(vaddr); | |
458a3e64 TH |
112 | |
113 | return one_md_table_init(swapper_pg_dir + pgd_idx) + pmd_idx; | |
114 | } | |
115 | ||
116 | pte_t * __init populate_extra_pte(unsigned long vaddr) | |
117 | { | |
118 | int pte_idx = pte_index(vaddr); | |
11124411 TH |
119 | pmd_t *pmd; |
120 | ||
458a3e64 TH |
121 | pmd = populate_extra_pmd(vaddr); |
122 | return one_page_table_init(pmd) + pte_idx; | |
11124411 TH |
123 | } |
124 | ||
719272c4 YL |
125 | static unsigned long __init |
126 | page_table_range_init_count(unsigned long start, unsigned long end) | |
127 | { | |
128 | unsigned long count = 0; | |
129 | #ifdef CONFIG_HIGHMEM | |
130 | int pmd_idx_kmap_begin = fix_to_virt(FIX_KMAP_END) >> PMD_SHIFT; | |
131 | int pmd_idx_kmap_end = fix_to_virt(FIX_KMAP_BEGIN) >> PMD_SHIFT; | |
132 | int pgd_idx, pmd_idx; | |
133 | unsigned long vaddr; | |
134 | ||
135 | if (pmd_idx_kmap_begin == pmd_idx_kmap_end) | |
136 | return 0; | |
137 | ||
138 | vaddr = start; | |
139 | pgd_idx = pgd_index(vaddr); | |
9962eea9 | 140 | pmd_idx = pmd_index(vaddr); |
719272c4 YL |
141 | |
142 | for ( ; (pgd_idx < PTRS_PER_PGD) && (vaddr != end); pgd_idx++) { | |
143 | for (; (pmd_idx < PTRS_PER_PMD) && (vaddr != end); | |
144 | pmd_idx++) { | |
145 | if ((vaddr >> PMD_SHIFT) >= pmd_idx_kmap_begin && | |
146 | (vaddr >> PMD_SHIFT) <= pmd_idx_kmap_end) | |
147 | count++; | |
148 | vaddr += PMD_SIZE; | |
149 | } | |
150 | pmd_idx = 0; | |
151 | } | |
152 | #endif | |
153 | return count; | |
154 | } | |
155 | ||
a3c6018e | 156 | static pte_t *__init page_table_kmap_check(pte_t *pte, pmd_t *pmd, |
719272c4 YL |
157 | unsigned long vaddr, pte_t *lastpte, |
158 | void **adr) | |
a3c6018e JB |
159 | { |
160 | #ifdef CONFIG_HIGHMEM | |
161 | /* | |
162 | * Something (early fixmap) may already have put a pte | |
163 | * page here, which causes the page table allocation | |
164 | * to become nonlinear. Attempt to fix it, and if it | |
165 | * is still nonlinear then we have to bug. | |
166 | */ | |
167 | int pmd_idx_kmap_begin = fix_to_virt(FIX_KMAP_END) >> PMD_SHIFT; | |
168 | int pmd_idx_kmap_end = fix_to_virt(FIX_KMAP_BEGIN) >> PMD_SHIFT; | |
169 | ||
170 | if (pmd_idx_kmap_begin != pmd_idx_kmap_end | |
171 | && (vaddr >> PMD_SHIFT) >= pmd_idx_kmap_begin | |
719272c4 | 172 | && (vaddr >> PMD_SHIFT) <= pmd_idx_kmap_end) { |
a3c6018e JB |
173 | pte_t *newpte; |
174 | int i; | |
175 | ||
c464573c | 176 | BUG_ON(after_bootmem); |
719272c4 | 177 | newpte = *adr; |
a3c6018e JB |
178 | for (i = 0; i < PTRS_PER_PTE; i++) |
179 | set_pte(newpte + i, pte[i]); | |
719272c4 | 180 | *adr = (void *)(((unsigned long)(*adr)) + PAGE_SIZE); |
a3c6018e JB |
181 | |
182 | paravirt_alloc_pte(&init_mm, __pa(newpte) >> PAGE_SHIFT); | |
183 | set_pmd(pmd, __pmd(__pa(newpte)|_PAGE_TABLE)); | |
184 | BUG_ON(newpte != pte_offset_kernel(pmd, 0)); | |
185 | __flush_tlb_all(); | |
186 | ||
187 | paravirt_release_pte(__pa(pte) >> PAGE_SHIFT); | |
188 | pte = newpte; | |
189 | } | |
190 | BUG_ON(vaddr < fix_to_virt(FIX_KMAP_BEGIN - 1) | |
191 | && vaddr > fix_to_virt(FIX_KMAP_END) | |
192 | && lastpte && lastpte + PTRS_PER_PTE != pte); | |
193 | #endif | |
194 | return pte; | |
195 | } | |
196 | ||
1da177e4 | 197 | /* |
8550eb99 | 198 | * This function initializes a certain range of kernel virtual memory |
1da177e4 LT |
199 | * with new bootmem page tables, everywhere page tables are missing in |
200 | * the given range. | |
8550eb99 IM |
201 | * |
202 | * NOTE: The pagetables are allocated contiguous on the physical space | |
203 | * so we can cache the place of the first one and move around without | |
1da177e4 LT |
204 | * checking the pgd every time. |
205 | */ | |
8550eb99 IM |
206 | static void __init |
207 | page_table_range_init(unsigned long start, unsigned long end, pgd_t *pgd_base) | |
1da177e4 | 208 | { |
1da177e4 LT |
209 | int pgd_idx, pmd_idx; |
210 | unsigned long vaddr; | |
8550eb99 IM |
211 | pgd_t *pgd; |
212 | pmd_t *pmd; | |
a3c6018e | 213 | pte_t *pte = NULL; |
719272c4 YL |
214 | unsigned long count = page_table_range_init_count(start, end); |
215 | void *adr = NULL; | |
216 | ||
217 | if (count) | |
218 | adr = alloc_low_pages(count); | |
1da177e4 LT |
219 | |
220 | vaddr = start; | |
221 | pgd_idx = pgd_index(vaddr); | |
222 | pmd_idx = pmd_index(vaddr); | |
223 | pgd = pgd_base + pgd_idx; | |
224 | ||
225 | for ( ; (pgd_idx < PTRS_PER_PGD) && (vaddr != end); pgd++, pgd_idx++) { | |
b239fb25 JF |
226 | pmd = one_md_table_init(pgd); |
227 | pmd = pmd + pmd_index(vaddr); | |
8550eb99 IM |
228 | for (; (pmd_idx < PTRS_PER_PMD) && (vaddr != end); |
229 | pmd++, pmd_idx++) { | |
a3c6018e | 230 | pte = page_table_kmap_check(one_page_table_init(pmd), |
719272c4 | 231 | pmd, vaddr, pte, &adr); |
1da177e4 LT |
232 | |
233 | vaddr += PMD_SIZE; | |
234 | } | |
235 | pmd_idx = 0; | |
236 | } | |
237 | } | |
238 | ||
239 | static inline int is_kernel_text(unsigned long addr) | |
240 | { | |
5bd5a452 | 241 | if (addr >= (unsigned long)_text && addr <= (unsigned long)__init_end) |
1da177e4 LT |
242 | return 1; |
243 | return 0; | |
244 | } | |
245 | ||
246 | /* | |
8550eb99 IM |
247 | * This maps the physical memory to kernel virtual address space, a total |
248 | * of max_low_pfn pages, by creating page tables starting from address | |
249 | * PAGE_OFFSET: | |
1da177e4 | 250 | */ |
e53fb04f PE |
251 | unsigned long __init |
252 | kernel_physical_mapping_init(unsigned long start, | |
253 | unsigned long end, | |
254 | unsigned long page_size_mask) | |
1da177e4 | 255 | { |
e53fb04f | 256 | int use_pse = page_size_mask == (1<<PG_LEVEL_2M); |
c1fd1b43 | 257 | unsigned long last_map_addr = end; |
e53fb04f | 258 | unsigned long start_pfn, end_pfn; |
e7179853 | 259 | pgd_t *pgd_base = swapper_pg_dir; |
8550eb99 | 260 | int pgd_idx, pmd_idx, pte_ofs; |
1da177e4 LT |
261 | unsigned long pfn; |
262 | pgd_t *pgd; | |
263 | pmd_t *pmd; | |
264 | pte_t *pte; | |
a2699e47 SS |
265 | unsigned pages_2m, pages_4k; |
266 | int mapping_iter; | |
267 | ||
e53fb04f PE |
268 | start_pfn = start >> PAGE_SHIFT; |
269 | end_pfn = end >> PAGE_SHIFT; | |
270 | ||
a2699e47 SS |
271 | /* |
272 | * First iteration will setup identity mapping using large/small pages | |
273 | * based on use_pse, with other attributes same as set by | |
274 | * the early code in head_32.S | |
275 | * | |
276 | * Second iteration will setup the appropriate attributes (NX, GLOBAL..) | |
277 | * as desired for the kernel identity mapping. | |
278 | * | |
279 | * This two pass mechanism conforms to the TLB app note which says: | |
280 | * | |
281 | * "Software should not write to a paging-structure entry in a way | |
282 | * that would change, for any linear address, both the page size | |
283 | * and either the page frame or attributes." | |
284 | */ | |
285 | mapping_iter = 1; | |
1da177e4 | 286 | |
16bf9226 | 287 | if (!boot_cpu_has(X86_FEATURE_PSE)) |
a04ad82d | 288 | use_pse = 0; |
1da177e4 | 289 | |
a2699e47 SS |
290 | repeat: |
291 | pages_2m = pages_4k = 0; | |
a04ad82d YL |
292 | pfn = start_pfn; |
293 | pgd_idx = pgd_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET); | |
294 | pgd = pgd_base + pgd_idx; | |
1da177e4 LT |
295 | for (; pgd_idx < PTRS_PER_PGD; pgd++, pgd_idx++) { |
296 | pmd = one_md_table_init(pgd); | |
8550eb99 | 297 | |
a04ad82d YL |
298 | if (pfn >= end_pfn) |
299 | continue; | |
300 | #ifdef CONFIG_X86_PAE | |
301 | pmd_idx = pmd_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET); | |
302 | pmd += pmd_idx; | |
303 | #else | |
304 | pmd_idx = 0; | |
305 | #endif | |
306 | for (; pmd_idx < PTRS_PER_PMD && pfn < end_pfn; | |
f3f20de8 | 307 | pmd++, pmd_idx++) { |
8550eb99 | 308 | unsigned int addr = pfn * PAGE_SIZE + PAGE_OFFSET; |
1da177e4 | 309 | |
8550eb99 IM |
310 | /* |
311 | * Map with big pages if possible, otherwise | |
312 | * create normal page tables: | |
313 | */ | |
a04ad82d | 314 | if (use_pse) { |
8550eb99 | 315 | unsigned int addr2; |
f3f20de8 | 316 | pgprot_t prot = PAGE_KERNEL_LARGE; |
a2699e47 SS |
317 | /* |
318 | * first pass will use the same initial | |
319 | * identity mapping attribute + _PAGE_PSE. | |
320 | */ | |
321 | pgprot_t init_prot = | |
322 | __pgprot(PTE_IDENT_ATTR | | |
323 | _PAGE_PSE); | |
f3f20de8 | 324 | |
960ddb4f | 325 | pfn &= PMD_MASK >> PAGE_SHIFT; |
8550eb99 | 326 | addr2 = (pfn + PTRS_PER_PTE-1) * PAGE_SIZE + |
f3f20de8 JF |
327 | PAGE_OFFSET + PAGE_SIZE-1; |
328 | ||
8550eb99 IM |
329 | if (is_kernel_text(addr) || |
330 | is_kernel_text(addr2)) | |
f3f20de8 JF |
331 | prot = PAGE_KERNEL_LARGE_EXEC; |
332 | ||
ce0c0e50 | 333 | pages_2m++; |
a2699e47 SS |
334 | if (mapping_iter == 1) |
335 | set_pmd(pmd, pfn_pmd(pfn, init_prot)); | |
336 | else | |
337 | set_pmd(pmd, pfn_pmd(pfn, prot)); | |
b239fb25 | 338 | |
1da177e4 | 339 | pfn += PTRS_PER_PTE; |
8550eb99 IM |
340 | continue; |
341 | } | |
342 | pte = one_page_table_init(pmd); | |
1da177e4 | 343 | |
a04ad82d YL |
344 | pte_ofs = pte_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET); |
345 | pte += pte_ofs; | |
346 | for (; pte_ofs < PTRS_PER_PTE && pfn < end_pfn; | |
8550eb99 IM |
347 | pte++, pfn++, pte_ofs++, addr += PAGE_SIZE) { |
348 | pgprot_t prot = PAGE_KERNEL; | |
a2699e47 SS |
349 | /* |
350 | * first pass will use the same initial | |
351 | * identity mapping attribute. | |
352 | */ | |
353 | pgprot_t init_prot = __pgprot(PTE_IDENT_ATTR); | |
f3f20de8 | 354 | |
8550eb99 IM |
355 | if (is_kernel_text(addr)) |
356 | prot = PAGE_KERNEL_EXEC; | |
f3f20de8 | 357 | |
ce0c0e50 | 358 | pages_4k++; |
c1fd1b43 | 359 | if (mapping_iter == 1) { |
a2699e47 | 360 | set_pte(pte, pfn_pte(pfn, init_prot)); |
c1fd1b43 PE |
361 | last_map_addr = (pfn << PAGE_SHIFT) + PAGE_SIZE; |
362 | } else | |
a2699e47 | 363 | set_pte(pte, pfn_pte(pfn, prot)); |
1da177e4 LT |
364 | } |
365 | } | |
366 | } | |
a2699e47 SS |
367 | if (mapping_iter == 1) { |
368 | /* | |
369 | * update direct mapping page count only in the first | |
370 | * iteration. | |
371 | */ | |
372 | update_page_count(PG_LEVEL_2M, pages_2m); | |
373 | update_page_count(PG_LEVEL_4K, pages_4k); | |
374 | ||
375 | /* | |
376 | * local global flush tlb, which will flush the previous | |
377 | * mappings present in both small and large page TLB's. | |
378 | */ | |
379 | __flush_tlb_all(); | |
380 | ||
381 | /* | |
382 | * Second iteration will set the actual desired PTE attributes. | |
383 | */ | |
384 | mapping_iter = 2; | |
385 | goto repeat; | |
386 | } | |
c1fd1b43 | 387 | return last_map_addr; |
ae531c26 AV |
388 | } |
389 | ||
1da177e4 | 390 | pte_t *kmap_pte; |
1da177e4 | 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); | |
1da177e4 LT |
407 | } |
408 | ||
fd940934 | 409 | #ifdef CONFIG_HIGHMEM |
1da177e4 LT |
410 | static void __init permanent_kmaps_init(pgd_t *pgd_base) |
411 | { | |
8550eb99 | 412 | unsigned long vaddr; |
1da177e4 LT |
413 | pgd_t *pgd; |
414 | pud_t *pud; | |
415 | pmd_t *pmd; | |
416 | pte_t *pte; | |
1da177e4 LT |
417 | |
418 | vaddr = PKMAP_BASE; | |
419 | page_table_range_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base); | |
420 | ||
421 | pgd = swapper_pg_dir + pgd_index(vaddr); | |
422 | pud = pud_offset(pgd, vaddr); | |
423 | pmd = pmd_offset(pud, vaddr); | |
424 | pte = pte_offset_kernel(pmd, vaddr); | |
8550eb99 | 425 | pkmap_page_table = pte; |
1da177e4 LT |
426 | } |
427 | ||
1d931264 YL |
428 | void __init add_highpages_with_active_regions(int nid, |
429 | unsigned long start_pfn, unsigned long end_pfn) | |
1da177e4 | 430 | { |
8a9ca34c TH |
431 | phys_addr_t start, end; |
432 | u64 i; | |
433 | ||
fc6daaf9 | 434 | for_each_free_mem_range(i, nid, MEMBLOCK_NONE, &start, &end, NULL) { |
8a9ca34c TH |
435 | unsigned long pfn = clamp_t(unsigned long, PFN_UP(start), |
436 | start_pfn, end_pfn); | |
437 | unsigned long e_pfn = clamp_t(unsigned long, PFN_DOWN(end), | |
438 | start_pfn, end_pfn); | |
439 | for ( ; pfn < e_pfn; pfn++) | |
440 | if (pfn_valid(pfn)) | |
5e7ccf86 | 441 | free_highmem_page(pfn_to_page(pfn)); |
23be8c7d | 442 | } |
b5bc6c0e | 443 | } |
1da177e4 | 444 | #else |
e8e32326 IB |
445 | static inline void permanent_kmaps_init(pgd_t *pgd_base) |
446 | { | |
447 | } | |
1da177e4 LT |
448 | #endif /* CONFIG_HIGHMEM */ |
449 | ||
7737b215 | 450 | void __init native_pagetable_init(void) |
1da177e4 | 451 | { |
551889a6 | 452 | unsigned long pfn, va; |
73090f89 | 453 | pgd_t *pgd, *base = swapper_pg_dir; |
551889a6 IC |
454 | pud_t *pud; |
455 | pmd_t *pmd; | |
456 | pte_t *pte; | |
b239fb25 JF |
457 | |
458 | /* | |
551889a6 | 459 | * Remove any mappings which extend past the end of physical |
11ed9e92 YL |
460 | * memory from the boot time page table. |
461 | * In virtual address space, we should have at least two pages | |
462 | * from VMALLOC_END to pkmap or fixmap according to VMALLOC_END | |
463 | * definition. And max_low_pfn is set to VMALLOC_END physical | |
464 | * address. If initial memory mapping is doing right job, we | |
465 | * should have pte used near max_low_pfn or one pmd is not present. | |
b239fb25 | 466 | */ |
11ed9e92 | 467 | for (pfn = max_low_pfn; pfn < 1<<(32-PAGE_SHIFT); pfn++) { |
551889a6 IC |
468 | va = PAGE_OFFSET + (pfn<<PAGE_SHIFT); |
469 | pgd = base + pgd_index(va); | |
470 | if (!pgd_present(*pgd)) | |
471 | break; | |
472 | ||
473 | pud = pud_offset(pgd, va); | |
474 | pmd = pmd_offset(pud, va); | |
475 | if (!pmd_present(*pmd)) | |
476 | break; | |
477 | ||
11ed9e92 YL |
478 | /* should not be large page here */ |
479 | if (pmd_large(*pmd)) { | |
480 | pr_warn("try to clear pte for ram above max_low_pfn: pfn: %lx pmd: %p pmd phys: %lx, but pmd is big page and is not using pte !\n", | |
481 | pfn, pmd, __pa(pmd)); | |
482 | BUG_ON(1); | |
483 | } | |
484 | ||
551889a6 IC |
485 | pte = pte_offset_kernel(pmd, va); |
486 | if (!pte_present(*pte)) | |
487 | break; | |
488 | ||
11ed9e92 YL |
489 | printk(KERN_DEBUG "clearing pte for ram above max_low_pfn: pfn: %lx pmd: %p pmd phys: %lx pte: %p pte phys: %lx\n", |
490 | pfn, pmd, __pa(pmd), pte, __pa(pte)); | |
551889a6 IC |
491 | pte_clear(NULL, va, pte); |
492 | } | |
6944a9c8 | 493 | paravirt_alloc_pmd(&init_mm, __pa(base) >> PAGE_SHIFT); |
843b8ed2 | 494 | paging_init(); |
b239fb25 JF |
495 | } |
496 | ||
b239fb25 JF |
497 | /* |
498 | * Build a proper pagetable for the kernel mappings. Up until this | |
499 | * point, we've been running on some set of pagetables constructed by | |
500 | * the boot process. | |
501 | * | |
502 | * If we're booting on native hardware, this will be a pagetable | |
551889a6 IC |
503 | * constructed in arch/x86/kernel/head_32.S. The root of the |
504 | * pagetable will be swapper_pg_dir. | |
b239fb25 JF |
505 | * |
506 | * If we're booting paravirtualized under a hypervisor, then there are | |
507 | * more options: we may already be running PAE, and the pagetable may | |
508 | * or may not be based in swapper_pg_dir. In any case, | |
7737b215 | 509 | * paravirt_pagetable_init() will set up swapper_pg_dir |
b239fb25 JF |
510 | * appropriately for the rest of the initialization to work. |
511 | * | |
512 | * In general, pagetable_init() assumes that the pagetable may already | |
513 | * be partially populated, and so it avoids stomping on any existing | |
514 | * mappings. | |
515 | */ | |
f765090a | 516 | void __init early_ioremap_page_table_range_init(void) |
b239fb25 | 517 | { |
e7179853 | 518 | pgd_t *pgd_base = swapper_pg_dir; |
8550eb99 | 519 | unsigned long vaddr, end; |
b239fb25 | 520 | |
1da177e4 LT |
521 | /* |
522 | * Fixed mappings, only the page table structure has to be | |
523 | * created - mappings will be set by set_fixmap(): | |
524 | */ | |
525 | vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK; | |
b239fb25 JF |
526 | end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK; |
527 | page_table_range_init(vaddr, end, pgd_base); | |
beacfaac | 528 | early_ioremap_reset(); |
e7b37895 YL |
529 | } |
530 | ||
531 | static void __init pagetable_init(void) | |
532 | { | |
533 | pgd_t *pgd_base = swapper_pg_dir; | |
534 | ||
1da177e4 | 535 | permanent_kmaps_init(pgd_base); |
1da177e4 LT |
536 | } |
537 | ||
f955371c | 538 | pteval_t __supported_pte_mask __read_mostly = ~(_PAGE_NX | _PAGE_GLOBAL); |
6fdc05d4 JF |
539 | EXPORT_SYMBOL_GPL(__supported_pte_mask); |
540 | ||
90d967e0 YL |
541 | /* user-defined highmem size */ |
542 | static unsigned int highmem_pages = -1; | |
543 | ||
544 | /* | |
545 | * highmem=size forces highmem to be exactly 'size' bytes. | |
546 | * This works even on boxes that have no highmem otherwise. | |
547 | * This also works to reduce highmem size on bigger boxes. | |
548 | */ | |
549 | static int __init parse_highmem(char *arg) | |
550 | { | |
551 | if (!arg) | |
552 | return -EINVAL; | |
553 | ||
554 | highmem_pages = memparse(arg, &arg) >> PAGE_SHIFT; | |
555 | return 0; | |
556 | } | |
557 | early_param("highmem", parse_highmem); | |
558 | ||
4769843b IM |
559 | #define MSG_HIGHMEM_TOO_BIG \ |
560 | "highmem size (%luMB) is bigger than pages available (%luMB)!\n" | |
561 | ||
562 | #define MSG_LOWMEM_TOO_SMALL \ | |
563 | "highmem size (%luMB) results in <64MB lowmem, ignoring it!\n" | |
90d967e0 | 564 | /* |
4769843b IM |
565 | * All of RAM fits into lowmem - but if user wants highmem |
566 | * artificially via the highmem=x boot parameter then create | |
567 | * it: | |
90d967e0 | 568 | */ |
f836e35a | 569 | static void __init lowmem_pfn_init(void) |
90d967e0 | 570 | { |
346cafec | 571 | /* max_low_pfn is 0, we already have early_res support */ |
90d967e0 | 572 | max_low_pfn = max_pfn; |
d88316c2 | 573 | |
4769843b IM |
574 | if (highmem_pages == -1) |
575 | highmem_pages = 0; | |
576 | #ifdef CONFIG_HIGHMEM | |
577 | if (highmem_pages >= max_pfn) { | |
578 | printk(KERN_ERR MSG_HIGHMEM_TOO_BIG, | |
579 | pages_to_mb(highmem_pages), pages_to_mb(max_pfn)); | |
580 | highmem_pages = 0; | |
581 | } | |
582 | if (highmem_pages) { | |
583 | if (max_low_pfn - highmem_pages < 64*1024*1024/PAGE_SIZE) { | |
584 | printk(KERN_ERR MSG_LOWMEM_TOO_SMALL, | |
90d967e0 YL |
585 | pages_to_mb(highmem_pages)); |
586 | highmem_pages = 0; | |
587 | } | |
4769843b IM |
588 | max_low_pfn -= highmem_pages; |
589 | } | |
590 | #else | |
591 | if (highmem_pages) | |
592 | printk(KERN_ERR "ignoring highmem size on non-highmem kernel!\n"); | |
593 | #endif | |
594 | } | |
595 | ||
596 | #define MSG_HIGHMEM_TOO_SMALL \ | |
597 | "only %luMB highmem pages available, ignoring highmem size of %luMB!\n" | |
598 | ||
599 | #define MSG_HIGHMEM_TRIMMED \ | |
600 | "Warning: only 4GB will be used. Use a HIGHMEM64G enabled kernel!\n" | |
601 | /* | |
602 | * We have more RAM than fits into lowmem - we try to put it into | |
603 | * highmem, also taking the highmem=x boot parameter into account: | |
604 | */ | |
f836e35a | 605 | static void __init highmem_pfn_init(void) |
4769843b | 606 | { |
d88316c2 IM |
607 | max_low_pfn = MAXMEM_PFN; |
608 | ||
4769843b IM |
609 | if (highmem_pages == -1) |
610 | highmem_pages = max_pfn - MAXMEM_PFN; | |
611 | ||
612 | if (highmem_pages + MAXMEM_PFN < max_pfn) | |
613 | max_pfn = MAXMEM_PFN + highmem_pages; | |
614 | ||
615 | if (highmem_pages + MAXMEM_PFN > max_pfn) { | |
616 | printk(KERN_WARNING MSG_HIGHMEM_TOO_SMALL, | |
617 | pages_to_mb(max_pfn - MAXMEM_PFN), | |
618 | pages_to_mb(highmem_pages)); | |
619 | highmem_pages = 0; | |
620 | } | |
90d967e0 | 621 | #ifndef CONFIG_HIGHMEM |
4769843b IM |
622 | /* Maximum memory usable is what is directly addressable */ |
623 | printk(KERN_WARNING "Warning only %ldMB will be used.\n", MAXMEM>>20); | |
624 | if (max_pfn > MAX_NONPAE_PFN) | |
625 | printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n"); | |
626 | else | |
627 | printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n"); | |
628 | max_pfn = MAXMEM_PFN; | |
90d967e0 YL |
629 | #else /* !CONFIG_HIGHMEM */ |
630 | #ifndef CONFIG_HIGHMEM64G | |
4769843b IM |
631 | if (max_pfn > MAX_NONPAE_PFN) { |
632 | max_pfn = MAX_NONPAE_PFN; | |
633 | printk(KERN_WARNING MSG_HIGHMEM_TRIMMED); | |
634 | } | |
90d967e0 YL |
635 | #endif /* !CONFIG_HIGHMEM64G */ |
636 | #endif /* !CONFIG_HIGHMEM */ | |
4769843b IM |
637 | } |
638 | ||
639 | /* | |
640 | * Determine low and high memory ranges: | |
641 | */ | |
642 | void __init find_low_pfn_range(void) | |
643 | { | |
644 | /* it could update max_pfn */ | |
645 | ||
d88316c2 | 646 | if (max_pfn <= MAXMEM_PFN) |
4769843b | 647 | lowmem_pfn_init(); |
d88316c2 IM |
648 | else |
649 | highmem_pfn_init(); | |
90d967e0 YL |
650 | } |
651 | ||
b2ac82a0 | 652 | #ifndef CONFIG_NEED_MULTIPLE_NODES |
d8fc3afc | 653 | void __init initmem_init(void) |
b2ac82a0 | 654 | { |
b2ac82a0 YL |
655 | #ifdef CONFIG_HIGHMEM |
656 | highstart_pfn = highend_pfn = max_pfn; | |
657 | if (max_pfn > max_low_pfn) | |
658 | highstart_pfn = max_low_pfn; | |
b2ac82a0 YL |
659 | printk(KERN_NOTICE "%ldMB HIGHMEM available.\n", |
660 | pages_to_mb(highend_pfn - highstart_pfn)); | |
b2ac82a0 YL |
661 | high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1; |
662 | #else | |
b2ac82a0 YL |
663 | high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1; |
664 | #endif | |
0608f70c | 665 | |
e7e8de59 | 666 | memblock_set_node(0, (phys_addr_t)ULLONG_MAX, &memblock.memory, 0); |
0608f70c TH |
667 | sparse_memory_present_with_active_regions(0); |
668 | ||
b2ac82a0 | 669 | #ifdef CONFIG_FLATMEM |
46a84132 | 670 | max_mapnr = IS_ENABLED(CONFIG_HIGHMEM) ? highend_pfn : max_low_pfn; |
b2ac82a0 | 671 | #endif |
dc16ecf7 JF |
672 | __vmalloc_start_set = true; |
673 | ||
b2ac82a0 YL |
674 | printk(KERN_NOTICE "%ldMB LOWMEM available.\n", |
675 | pages_to_mb(max_low_pfn)); | |
676 | ||
677 | setup_bootmem_allocator(); | |
b2ac82a0 | 678 | } |
cb95a13a | 679 | #endif /* !CONFIG_NEED_MULTIPLE_NODES */ |
b2ac82a0 | 680 | |
b2ac82a0 YL |
681 | void __init setup_bootmem_allocator(void) |
682 | { | |
b2ac82a0 YL |
683 | printk(KERN_INFO " mapped low ram: 0 - %08lx\n", |
684 | max_pfn_mapped<<PAGE_SHIFT); | |
fc5efe39 | 685 | printk(KERN_INFO " low ram: 0 - %08lx\n", max_low_pfn<<PAGE_SHIFT); |
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"); |
a5c2a893 | 730 | panic("Linux doesn't support CPUs with broken WP."); |
1da177e4 | 731 | } else { |
d7d119d7 | 732 | printk(KERN_CONT "Ok.\n"); |
1da177e4 LT |
733 | } |
734 | } | |
735 | ||
1da177e4 LT |
736 | void __init mem_init(void) |
737 | { | |
cfb80c9e JF |
738 | pci_iommu_alloc(); |
739 | ||
05b79bdc | 740 | #ifdef CONFIG_FLATMEM |
8d8f3cbe | 741 | BUG_ON(!mem_map); |
1da177e4 | 742 | #endif |
855c743a SG |
743 | /* |
744 | * With CONFIG_DEBUG_PAGEALLOC initialization of highmem pages has to | |
745 | * be done before free_all_bootmem(). Memblock use free low memory for | |
746 | * temporary data (see find_range_array()) and for this purpose can use | |
747 | * pages that was already passed to the buddy allocator, hence marked as | |
748 | * not accessible in the page tables when compiled with | |
749 | * CONFIG_DEBUG_PAGEALLOC. Otherwise order of initialization is not | |
750 | * important here. | |
751 | */ | |
752 | set_highmem_pages_init(); | |
753 | ||
1da177e4 | 754 | /* this will put all low memory onto the freelists */ |
0c988534 | 755 | free_all_bootmem(); |
1da177e4 | 756 | |
4e37a890 YL |
757 | after_bootmem = 1; |
758 | ||
46a84132 | 759 | mem_init_print_info(NULL); |
d7d119d7 | 760 | printk(KERN_INFO "virtual kernel memory layout:\n" |
8550eb99 | 761 | " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" |
052e7994 | 762 | #ifdef CONFIG_HIGHMEM |
8550eb99 | 763 | " pkmap : 0x%08lx - 0x%08lx (%4ld kB)\n" |
052e7994 | 764 | #endif |
8550eb99 IM |
765 | " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" |
766 | " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
767 | " .init : 0x%08lx - 0x%08lx (%4ld kB)\n" | |
768 | " .data : 0x%08lx - 0x%08lx (%4ld kB)\n" | |
769 | " .text : 0x%08lx - 0x%08lx (%4ld kB)\n", | |
770 | FIXADDR_START, FIXADDR_TOP, | |
771 | (FIXADDR_TOP - FIXADDR_START) >> 10, | |
052e7994 JF |
772 | |
773 | #ifdef CONFIG_HIGHMEM | |
8550eb99 IM |
774 | PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE, |
775 | (LAST_PKMAP*PAGE_SIZE) >> 10, | |
052e7994 JF |
776 | #endif |
777 | ||
8550eb99 IM |
778 | VMALLOC_START, VMALLOC_END, |
779 | (VMALLOC_END - VMALLOC_START) >> 20, | |
052e7994 | 780 | |
8550eb99 IM |
781 | (unsigned long)__va(0), (unsigned long)high_memory, |
782 | ((unsigned long)high_memory - (unsigned long)__va(0)) >> 20, | |
052e7994 | 783 | |
8550eb99 IM |
784 | (unsigned long)&__init_begin, (unsigned long)&__init_end, |
785 | ((unsigned long)&__init_end - | |
786 | (unsigned long)&__init_begin) >> 10, | |
052e7994 | 787 | |
8550eb99 IM |
788 | (unsigned long)&_etext, (unsigned long)&_edata, |
789 | ((unsigned long)&_edata - (unsigned long)&_etext) >> 10, | |
052e7994 | 790 | |
8550eb99 IM |
791 | (unsigned long)&_text, (unsigned long)&_etext, |
792 | ((unsigned long)&_etext - (unsigned long)&_text) >> 10); | |
052e7994 | 793 | |
beeb4195 JB |
794 | /* |
795 | * Check boundaries twice: Some fundamental inconsistencies can | |
796 | * be detected at build time already. | |
797 | */ | |
798 | #define __FIXADDR_TOP (-PAGE_SIZE) | |
799 | #ifdef CONFIG_HIGHMEM | |
800 | BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP*PAGE_SIZE > FIXADDR_START); | |
801 | BUILD_BUG_ON(VMALLOC_END > PKMAP_BASE); | |
802 | #endif | |
803 | #define high_memory (-128UL << 20) | |
804 | BUILD_BUG_ON(VMALLOC_START >= VMALLOC_END); | |
805 | #undef high_memory | |
806 | #undef __FIXADDR_TOP | |
6145cfe3 KC |
807 | #ifdef CONFIG_RANDOMIZE_BASE |
808 | BUILD_BUG_ON(CONFIG_RANDOMIZE_BASE_MAX_OFFSET > KERNEL_IMAGE_SIZE); | |
809 | #endif | |
beeb4195 | 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 |
033fbae9 | 823 | int arch_add_memory(int nid, u64 start, u64 size, bool for_device) |
05039b92 | 824 | { |
7c7e9425 | 825 | struct pglist_data *pgdata = NODE_DATA(nid); |
03d4be64 | 826 | struct zone *zone = pgdata->node_zones + |
033fbae9 | 827 | zone_for_memory(nid, start, size, ZONE_HIGHMEM, for_device); |
05039b92 DH |
828 | unsigned long start_pfn = start >> PAGE_SHIFT; |
829 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
830 | ||
c04fc586 | 831 | return __add_pages(nid, zone, start_pfn, nr_pages); |
05039b92 | 832 | } |
24d335ca WC |
833 | |
834 | #ifdef CONFIG_MEMORY_HOTREMOVE | |
835 | int arch_remove_memory(u64 start, u64 size) | |
836 | { | |
837 | unsigned long start_pfn = start >> PAGE_SHIFT; | |
838 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
839 | struct zone *zone; | |
840 | ||
841 | zone = page_zone(pfn_to_page(start_pfn)); | |
842 | return __remove_pages(zone, start_pfn, nr_pages); | |
843 | } | |
844 | #endif | |
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 | ||
edeed305 AV |
871 | const int rodata_test_data = 0xC3; |
872 | EXPORT_SYMBOL_GPL(rodata_test_data); | |
63aaf308 | 873 | |
502f6604 | 874 | int kernel_set_to_readonly __read_mostly; |
16239630 SR |
875 | |
876 | void set_kernel_text_rw(void) | |
877 | { | |
878 | unsigned long start = PFN_ALIGN(_text); | |
879 | unsigned long size = PFN_ALIGN(_etext) - start; | |
880 | ||
881 | if (!kernel_set_to_readonly) | |
882 | return; | |
883 | ||
884 | pr_debug("Set kernel text: %lx - %lx for read write\n", | |
885 | start, start+size); | |
886 | ||
887 | set_pages_rw(virt_to_page(start), size >> PAGE_SHIFT); | |
888 | } | |
889 | ||
890 | void set_kernel_text_ro(void) | |
891 | { | |
892 | unsigned long start = PFN_ALIGN(_text); | |
893 | unsigned long size = PFN_ALIGN(_etext) - start; | |
894 | ||
895 | if (!kernel_set_to_readonly) | |
896 | return; | |
897 | ||
898 | pr_debug("Set kernel text: %lx - %lx for read only\n", | |
899 | start, start+size); | |
900 | ||
901 | set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT); | |
902 | } | |
903 | ||
5bd5a452 MC |
904 | static void mark_nxdata_nx(void) |
905 | { | |
906 | /* | |
907 | * When this called, init has already been executed and released, | |
0d2eb44f | 908 | * so everything past _etext should be NX. |
5bd5a452 MC |
909 | */ |
910 | unsigned long start = PFN_ALIGN(_etext); | |
911 | /* | |
912 | * This comes from is_kernel_text upper limit. Also HPAGE where used: | |
913 | */ | |
914 | unsigned long size = (((unsigned long)__init_end + HPAGE_SIZE) & HPAGE_MASK) - start; | |
915 | ||
916 | if (__supported_pte_mask & _PAGE_NX) | |
917 | printk(KERN_INFO "NX-protecting the kernel data: %luk\n", size >> 10); | |
918 | set_pages_nx(virt_to_page(start), size >> PAGE_SHIFT); | |
919 | } | |
920 | ||
63aaf308 AV |
921 | void mark_rodata_ro(void) |
922 | { | |
6fb14755 JB |
923 | unsigned long start = PFN_ALIGN(_text); |
924 | unsigned long size = PFN_ALIGN(_etext) - start; | |
63aaf308 | 925 | |
4e4eee0e MD |
926 | set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT); |
927 | printk(KERN_INFO "Write protecting the kernel text: %luk\n", | |
928 | size >> 10); | |
0c42f392 | 929 | |
16239630 SR |
930 | kernel_set_to_readonly = 1; |
931 | ||
0c42f392 | 932 | #ifdef CONFIG_CPA_DEBUG |
4e4eee0e MD |
933 | printk(KERN_INFO "Testing CPA: Reverting %lx-%lx\n", |
934 | start, start+size); | |
935 | set_pages_rw(virt_to_page(start), size>>PAGE_SHIFT); | |
0c42f392 | 936 | |
4e4eee0e MD |
937 | printk(KERN_INFO "Testing CPA: write protecting again\n"); |
938 | set_pages_ro(virt_to_page(start), size>>PAGE_SHIFT); | |
602033ed | 939 | #endif |
8f0f996e | 940 | |
6fb14755 JB |
941 | start += size; |
942 | size = (unsigned long)__end_rodata - start; | |
6d238cc4 | 943 | set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT); |
d7d119d7 IM |
944 | printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n", |
945 | size >> 10); | |
edeed305 | 946 | rodata_test(); |
63aaf308 | 947 | |
0c42f392 | 948 | #ifdef CONFIG_CPA_DEBUG |
d7d119d7 | 949 | printk(KERN_INFO "Testing CPA: undo %lx-%lx\n", start, start + size); |
6d238cc4 | 950 | set_pages_rw(virt_to_page(start), size >> PAGE_SHIFT); |
0c42f392 | 951 | |
d7d119d7 | 952 | printk(KERN_INFO "Testing CPA: write protecting again\n"); |
6d238cc4 | 953 | set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT); |
0c42f392 | 954 | #endif |
5bd5a452 | 955 | mark_nxdata_nx(); |
e1a58320 SS |
956 | if (__supported_pte_mask & _PAGE_NX) |
957 | debug_checkwx(); | |
63aaf308 | 958 | } |