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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 LT |
27 | #include <linux/bootmem.h> |
28 | #include <linux/slab.h> | |
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> |
1da177e4 | 33 | |
f832ff18 | 34 | #include <asm/asm.h> |
46eaa670 | 35 | #include <asm/bios_ebda.h> |
1da177e4 LT |
36 | #include <asm/processor.h> |
37 | #include <asm/system.h> | |
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> | |
a5a19c63 | 47 | #include <asm/pgalloc.h> |
1da177e4 | 48 | #include <asm/sections.h> |
b239fb25 | 49 | #include <asm/paravirt.h> |
551889a6 | 50 | #include <asm/setup.h> |
7bfeab9a | 51 | #include <asm/cacheflush.h> |
1da177e4 | 52 | |
f361a450 | 53 | unsigned long max_low_pfn_mapped; |
67794292 | 54 | unsigned long max_pfn_mapped; |
7d1116a9 | 55 | |
1da177e4 LT |
56 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); |
57 | unsigned long highstart_pfn, highend_pfn; | |
58 | ||
8550eb99 | 59 | static noinline int do_test_wp_bit(void); |
1da177e4 | 60 | |
4e29684c | 61 | |
f765090a PE |
62 | extern unsigned long __initdata table_start; |
63 | extern unsigned long __meminitdata table_end; | |
64 | extern unsigned long __meminitdata table_top; | |
4bbd4fa0 | 65 | |
d6be89ad | 66 | static __init void *alloc_low_page(void) |
4e29684c YL |
67 | { |
68 | unsigned long pfn = table_end++; | |
69 | void *adr; | |
70 | ||
71 | if (pfn >= table_top) | |
72 | panic("alloc_low_page: ran out of memory"); | |
73 | ||
74 | adr = __va(pfn * PAGE_SIZE); | |
75 | memset(adr, 0, PAGE_SIZE); | |
4e29684c YL |
76 | return adr; |
77 | } | |
78 | ||
1da177e4 LT |
79 | /* |
80 | * Creates a middle page table and puts a pointer to it in the | |
81 | * given global directory entry. This only returns the gd entry | |
82 | * in non-PAE compilation mode, since the middle layer is folded. | |
83 | */ | |
84 | static pmd_t * __init one_md_table_init(pgd_t *pgd) | |
85 | { | |
86 | pud_t *pud; | |
87 | pmd_t *pmd_table; | |
8550eb99 | 88 | |
1da177e4 | 89 | #ifdef CONFIG_X86_PAE |
b239fb25 | 90 | if (!(pgd_val(*pgd) & _PAGE_PRESENT)) { |
c464573c | 91 | if (after_bootmem) |
4e29684c YL |
92 | pmd_table = (pmd_t *)alloc_bootmem_low_pages(PAGE_SIZE); |
93 | else | |
d6be89ad | 94 | pmd_table = (pmd_t *)alloc_low_page(); |
6944a9c8 | 95 | paravirt_alloc_pmd(&init_mm, __pa(pmd_table) >> PAGE_SHIFT); |
b239fb25 JF |
96 | set_pgd(pgd, __pgd(__pa(pmd_table) | _PAGE_PRESENT)); |
97 | pud = pud_offset(pgd, 0); | |
8550eb99 | 98 | BUG_ON(pmd_table != pmd_offset(pud, 0)); |
a376f30a Z |
99 | |
100 | return pmd_table; | |
b239fb25 JF |
101 | } |
102 | #endif | |
1da177e4 LT |
103 | pud = pud_offset(pgd, 0); |
104 | pmd_table = pmd_offset(pud, 0); | |
8550eb99 | 105 | |
1da177e4 LT |
106 | return pmd_table; |
107 | } | |
108 | ||
109 | /* | |
110 | * Create a page table and place a pointer to it in a middle page | |
8550eb99 | 111 | * directory entry: |
1da177e4 LT |
112 | */ |
113 | static pte_t * __init one_page_table_init(pmd_t *pmd) | |
114 | { | |
b239fb25 | 115 | if (!(pmd_val(*pmd) & _PAGE_PRESENT)) { |
509a80c4 IM |
116 | pte_t *page_table = NULL; |
117 | ||
c464573c | 118 | if (after_bootmem) { |
509a80c4 | 119 | #ifdef CONFIG_DEBUG_PAGEALLOC |
4e29684c | 120 | page_table = (pte_t *) alloc_bootmem_pages(PAGE_SIZE); |
509a80c4 | 121 | #endif |
4e29684c YL |
122 | if (!page_table) |
123 | page_table = | |
509a80c4 | 124 | (pte_t *)alloc_bootmem_low_pages(PAGE_SIZE); |
d6be89ad JB |
125 | } else |
126 | page_table = (pte_t *)alloc_low_page(); | |
b239fb25 | 127 | |
6944a9c8 | 128 | paravirt_alloc_pte(&init_mm, __pa(page_table) >> PAGE_SHIFT); |
1da177e4 | 129 | set_pmd(pmd, __pmd(__pa(page_table) | _PAGE_TABLE)); |
b239fb25 | 130 | BUG_ON(page_table != pte_offset_kernel(pmd, 0)); |
1da177e4 | 131 | } |
509a80c4 | 132 | |
1da177e4 LT |
133 | return pte_offset_kernel(pmd, 0); |
134 | } | |
135 | ||
a3c6018e JB |
136 | static pte_t *__init page_table_kmap_check(pte_t *pte, pmd_t *pmd, |
137 | unsigned long vaddr, pte_t *lastpte) | |
138 | { | |
139 | #ifdef CONFIG_HIGHMEM | |
140 | /* | |
141 | * Something (early fixmap) may already have put a pte | |
142 | * page here, which causes the page table allocation | |
143 | * to become nonlinear. Attempt to fix it, and if it | |
144 | * is still nonlinear then we have to bug. | |
145 | */ | |
146 | int pmd_idx_kmap_begin = fix_to_virt(FIX_KMAP_END) >> PMD_SHIFT; | |
147 | int pmd_idx_kmap_end = fix_to_virt(FIX_KMAP_BEGIN) >> PMD_SHIFT; | |
148 | ||
149 | if (pmd_idx_kmap_begin != pmd_idx_kmap_end | |
150 | && (vaddr >> PMD_SHIFT) >= pmd_idx_kmap_begin | |
151 | && (vaddr >> PMD_SHIFT) <= pmd_idx_kmap_end | |
152 | && ((__pa(pte) >> PAGE_SHIFT) < table_start | |
153 | || (__pa(pte) >> PAGE_SHIFT) >= table_end)) { | |
154 | pte_t *newpte; | |
155 | int i; | |
156 | ||
c464573c | 157 | BUG_ON(after_bootmem); |
a3c6018e JB |
158 | newpte = alloc_low_page(); |
159 | for (i = 0; i < PTRS_PER_PTE; i++) | |
160 | set_pte(newpte + i, pte[i]); | |
161 | ||
162 | paravirt_alloc_pte(&init_mm, __pa(newpte) >> PAGE_SHIFT); | |
163 | set_pmd(pmd, __pmd(__pa(newpte)|_PAGE_TABLE)); | |
164 | BUG_ON(newpte != pte_offset_kernel(pmd, 0)); | |
165 | __flush_tlb_all(); | |
166 | ||
167 | paravirt_release_pte(__pa(pte) >> PAGE_SHIFT); | |
168 | pte = newpte; | |
169 | } | |
170 | BUG_ON(vaddr < fix_to_virt(FIX_KMAP_BEGIN - 1) | |
171 | && vaddr > fix_to_virt(FIX_KMAP_END) | |
172 | && lastpte && lastpte + PTRS_PER_PTE != pte); | |
173 | #endif | |
174 | return pte; | |
175 | } | |
176 | ||
1da177e4 | 177 | /* |
8550eb99 | 178 | * This function initializes a certain range of kernel virtual memory |
1da177e4 LT |
179 | * with new bootmem page tables, everywhere page tables are missing in |
180 | * the given range. | |
8550eb99 IM |
181 | * |
182 | * NOTE: The pagetables are allocated contiguous on the physical space | |
183 | * so we can cache the place of the first one and move around without | |
1da177e4 LT |
184 | * checking the pgd every time. |
185 | */ | |
8550eb99 IM |
186 | static void __init |
187 | page_table_range_init(unsigned long start, unsigned long end, pgd_t *pgd_base) | |
1da177e4 | 188 | { |
1da177e4 LT |
189 | int pgd_idx, pmd_idx; |
190 | unsigned long vaddr; | |
8550eb99 IM |
191 | pgd_t *pgd; |
192 | pmd_t *pmd; | |
a3c6018e | 193 | pte_t *pte = NULL; |
1da177e4 LT |
194 | |
195 | vaddr = start; | |
196 | pgd_idx = pgd_index(vaddr); | |
197 | pmd_idx = pmd_index(vaddr); | |
198 | pgd = pgd_base + pgd_idx; | |
199 | ||
200 | for ( ; (pgd_idx < PTRS_PER_PGD) && (vaddr != end); pgd++, pgd_idx++) { | |
b239fb25 JF |
201 | pmd = one_md_table_init(pgd); |
202 | pmd = pmd + pmd_index(vaddr); | |
8550eb99 IM |
203 | for (; (pmd_idx < PTRS_PER_PMD) && (vaddr != end); |
204 | pmd++, pmd_idx++) { | |
a3c6018e JB |
205 | pte = page_table_kmap_check(one_page_table_init(pmd), |
206 | pmd, vaddr, pte); | |
1da177e4 LT |
207 | |
208 | vaddr += PMD_SIZE; | |
209 | } | |
210 | pmd_idx = 0; | |
211 | } | |
212 | } | |
213 | ||
214 | static inline int is_kernel_text(unsigned long addr) | |
215 | { | |
216 | if (addr >= PAGE_OFFSET && addr <= (unsigned long)__init_end) | |
217 | return 1; | |
218 | return 0; | |
219 | } | |
220 | ||
221 | /* | |
8550eb99 IM |
222 | * This maps the physical memory to kernel virtual address space, a total |
223 | * of max_low_pfn pages, by creating page tables starting from address | |
224 | * PAGE_OFFSET: | |
1da177e4 | 225 | */ |
f765090a PE |
226 | void __init kernel_physical_mapping_init(unsigned long start_pfn, |
227 | unsigned long end_pfn, | |
228 | int use_pse) | |
1da177e4 | 229 | { |
e7179853 | 230 | pgd_t *pgd_base = swapper_pg_dir; |
8550eb99 | 231 | int pgd_idx, pmd_idx, pte_ofs; |
1da177e4 LT |
232 | unsigned long pfn; |
233 | pgd_t *pgd; | |
234 | pmd_t *pmd; | |
235 | pte_t *pte; | |
a2699e47 SS |
236 | unsigned pages_2m, pages_4k; |
237 | int mapping_iter; | |
238 | ||
239 | /* | |
240 | * First iteration will setup identity mapping using large/small pages | |
241 | * based on use_pse, with other attributes same as set by | |
242 | * the early code in head_32.S | |
243 | * | |
244 | * Second iteration will setup the appropriate attributes (NX, GLOBAL..) | |
245 | * as desired for the kernel identity mapping. | |
246 | * | |
247 | * This two pass mechanism conforms to the TLB app note which says: | |
248 | * | |
249 | * "Software should not write to a paging-structure entry in a way | |
250 | * that would change, for any linear address, both the page size | |
251 | * and either the page frame or attributes." | |
252 | */ | |
253 | mapping_iter = 1; | |
1da177e4 | 254 | |
a04ad82d YL |
255 | if (!cpu_has_pse) |
256 | use_pse = 0; | |
1da177e4 | 257 | |
a2699e47 SS |
258 | repeat: |
259 | pages_2m = pages_4k = 0; | |
a04ad82d YL |
260 | pfn = start_pfn; |
261 | pgd_idx = pgd_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET); | |
262 | pgd = pgd_base + pgd_idx; | |
1da177e4 LT |
263 | for (; pgd_idx < PTRS_PER_PGD; pgd++, pgd_idx++) { |
264 | pmd = one_md_table_init(pgd); | |
8550eb99 | 265 | |
a04ad82d YL |
266 | if (pfn >= end_pfn) |
267 | continue; | |
268 | #ifdef CONFIG_X86_PAE | |
269 | pmd_idx = pmd_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET); | |
270 | pmd += pmd_idx; | |
271 | #else | |
272 | pmd_idx = 0; | |
273 | #endif | |
274 | for (; pmd_idx < PTRS_PER_PMD && pfn < end_pfn; | |
f3f20de8 | 275 | pmd++, pmd_idx++) { |
8550eb99 | 276 | unsigned int addr = pfn * PAGE_SIZE + PAGE_OFFSET; |
1da177e4 | 277 | |
8550eb99 IM |
278 | /* |
279 | * Map with big pages if possible, otherwise | |
280 | * create normal page tables: | |
281 | */ | |
a04ad82d | 282 | if (use_pse) { |
8550eb99 | 283 | unsigned int addr2; |
f3f20de8 | 284 | pgprot_t prot = PAGE_KERNEL_LARGE; |
a2699e47 SS |
285 | /* |
286 | * first pass will use the same initial | |
287 | * identity mapping attribute + _PAGE_PSE. | |
288 | */ | |
289 | pgprot_t init_prot = | |
290 | __pgprot(PTE_IDENT_ATTR | | |
291 | _PAGE_PSE); | |
f3f20de8 | 292 | |
8550eb99 | 293 | addr2 = (pfn + PTRS_PER_PTE-1) * PAGE_SIZE + |
f3f20de8 JF |
294 | PAGE_OFFSET + PAGE_SIZE-1; |
295 | ||
8550eb99 IM |
296 | if (is_kernel_text(addr) || |
297 | is_kernel_text(addr2)) | |
f3f20de8 JF |
298 | prot = PAGE_KERNEL_LARGE_EXEC; |
299 | ||
ce0c0e50 | 300 | pages_2m++; |
a2699e47 SS |
301 | if (mapping_iter == 1) |
302 | set_pmd(pmd, pfn_pmd(pfn, init_prot)); | |
303 | else | |
304 | set_pmd(pmd, pfn_pmd(pfn, prot)); | |
b239fb25 | 305 | |
1da177e4 | 306 | pfn += PTRS_PER_PTE; |
8550eb99 IM |
307 | continue; |
308 | } | |
309 | pte = one_page_table_init(pmd); | |
1da177e4 | 310 | |
a04ad82d YL |
311 | pte_ofs = pte_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET); |
312 | pte += pte_ofs; | |
313 | for (; pte_ofs < PTRS_PER_PTE && pfn < end_pfn; | |
8550eb99 IM |
314 | pte++, pfn++, pte_ofs++, addr += PAGE_SIZE) { |
315 | pgprot_t prot = PAGE_KERNEL; | |
a2699e47 SS |
316 | /* |
317 | * first pass will use the same initial | |
318 | * identity mapping attribute. | |
319 | */ | |
320 | pgprot_t init_prot = __pgprot(PTE_IDENT_ATTR); | |
f3f20de8 | 321 | |
8550eb99 IM |
322 | if (is_kernel_text(addr)) |
323 | prot = PAGE_KERNEL_EXEC; | |
f3f20de8 | 324 | |
ce0c0e50 | 325 | pages_4k++; |
a2699e47 SS |
326 | if (mapping_iter == 1) |
327 | set_pte(pte, pfn_pte(pfn, init_prot)); | |
328 | else | |
329 | set_pte(pte, pfn_pte(pfn, prot)); | |
1da177e4 LT |
330 | } |
331 | } | |
332 | } | |
a2699e47 SS |
333 | if (mapping_iter == 1) { |
334 | /* | |
335 | * update direct mapping page count only in the first | |
336 | * iteration. | |
337 | */ | |
338 | update_page_count(PG_LEVEL_2M, pages_2m); | |
339 | update_page_count(PG_LEVEL_4K, pages_4k); | |
340 | ||
341 | /* | |
342 | * local global flush tlb, which will flush the previous | |
343 | * mappings present in both small and large page TLB's. | |
344 | */ | |
345 | __flush_tlb_all(); | |
346 | ||
347 | /* | |
348 | * Second iteration will set the actual desired PTE attributes. | |
349 | */ | |
350 | mapping_iter = 2; | |
351 | goto repeat; | |
352 | } | |
1da177e4 LT |
353 | } |
354 | ||
1da177e4 LT |
355 | pte_t *kmap_pte; |
356 | pgprot_t kmap_prot; | |
357 | ||
8550eb99 IM |
358 | static inline pte_t *kmap_get_fixmap_pte(unsigned long vaddr) |
359 | { | |
360 | return pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), | |
361 | vaddr), vaddr), vaddr); | |
362 | } | |
1da177e4 LT |
363 | |
364 | static void __init kmap_init(void) | |
365 | { | |
366 | unsigned long kmap_vstart; | |
367 | ||
8550eb99 IM |
368 | /* |
369 | * Cache the first kmap pte: | |
370 | */ | |
1da177e4 LT |
371 | kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN); |
372 | kmap_pte = kmap_get_fixmap_pte(kmap_vstart); | |
373 | ||
374 | kmap_prot = PAGE_KERNEL; | |
375 | } | |
376 | ||
fd940934 | 377 | #ifdef CONFIG_HIGHMEM |
1da177e4 LT |
378 | static void __init permanent_kmaps_init(pgd_t *pgd_base) |
379 | { | |
8550eb99 | 380 | unsigned long vaddr; |
1da177e4 LT |
381 | pgd_t *pgd; |
382 | pud_t *pud; | |
383 | pmd_t *pmd; | |
384 | pte_t *pte; | |
1da177e4 LT |
385 | |
386 | vaddr = PKMAP_BASE; | |
387 | page_table_range_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base); | |
388 | ||
389 | pgd = swapper_pg_dir + pgd_index(vaddr); | |
390 | pud = pud_offset(pgd, vaddr); | |
391 | pmd = pmd_offset(pud, vaddr); | |
392 | pte = pte_offset_kernel(pmd, vaddr); | |
8550eb99 | 393 | pkmap_page_table = pte; |
1da177e4 LT |
394 | } |
395 | ||
cc9f7a0c | 396 | static void __init add_one_highpage_init(struct page *page, int pfn) |
1da177e4 | 397 | { |
cc9f7a0c YL |
398 | ClearPageReserved(page); |
399 | init_page_count(page); | |
400 | __free_page(page); | |
401 | totalhigh_pages++; | |
1da177e4 LT |
402 | } |
403 | ||
b5bc6c0e YL |
404 | struct add_highpages_data { |
405 | unsigned long start_pfn; | |
406 | unsigned long end_pfn; | |
b5bc6c0e YL |
407 | }; |
408 | ||
d52d53b8 | 409 | static int __init add_highpages_work_fn(unsigned long start_pfn, |
b5bc6c0e | 410 | unsigned long end_pfn, void *datax) |
1da177e4 | 411 | { |
b5bc6c0e YL |
412 | int node_pfn; |
413 | struct page *page; | |
414 | unsigned long final_start_pfn, final_end_pfn; | |
415 | struct add_highpages_data *data; | |
8550eb99 | 416 | |
b5bc6c0e | 417 | data = (struct add_highpages_data *)datax; |
b5bc6c0e YL |
418 | |
419 | final_start_pfn = max(start_pfn, data->start_pfn); | |
420 | final_end_pfn = min(end_pfn, data->end_pfn); | |
421 | if (final_start_pfn >= final_end_pfn) | |
d52d53b8 | 422 | return 0; |
b5bc6c0e YL |
423 | |
424 | for (node_pfn = final_start_pfn; node_pfn < final_end_pfn; | |
425 | node_pfn++) { | |
426 | if (!pfn_valid(node_pfn)) | |
427 | continue; | |
428 | page = pfn_to_page(node_pfn); | |
cc9f7a0c | 429 | add_one_highpage_init(page, node_pfn); |
23be8c7d | 430 | } |
b5bc6c0e | 431 | |
d52d53b8 YL |
432 | return 0; |
433 | ||
b5bc6c0e YL |
434 | } |
435 | ||
436 | void __init add_highpages_with_active_regions(int nid, unsigned long start_pfn, | |
cc9f7a0c | 437 | unsigned long end_pfn) |
b5bc6c0e YL |
438 | { |
439 | struct add_highpages_data data; | |
440 | ||
441 | data.start_pfn = start_pfn; | |
442 | data.end_pfn = end_pfn; | |
b5bc6c0e YL |
443 | |
444 | work_with_active_regions(nid, add_highpages_work_fn, &data); | |
445 | } | |
446 | ||
1da177e4 | 447 | #else |
e8e32326 IB |
448 | static inline void permanent_kmaps_init(pgd_t *pgd_base) |
449 | { | |
450 | } | |
1da177e4 LT |
451 | #endif /* CONFIG_HIGHMEM */ |
452 | ||
b239fb25 | 453 | void __init native_pagetable_setup_start(pgd_t *base) |
1da177e4 | 454 | { |
551889a6 IC |
455 | unsigned long pfn, va; |
456 | pgd_t *pgd; | |
457 | pud_t *pud; | |
458 | pmd_t *pmd; | |
459 | pte_t *pte; | |
b239fb25 JF |
460 | |
461 | /* | |
551889a6 IC |
462 | * Remove any mappings which extend past the end of physical |
463 | * memory from the boot time page table: | |
b239fb25 | 464 | */ |
551889a6 IC |
465 | for (pfn = max_low_pfn + 1; pfn < 1<<(32-PAGE_SHIFT); pfn++) { |
466 | va = PAGE_OFFSET + (pfn<<PAGE_SHIFT); | |
467 | pgd = base + pgd_index(va); | |
468 | if (!pgd_present(*pgd)) | |
469 | break; | |
470 | ||
471 | pud = pud_offset(pgd, va); | |
472 | pmd = pmd_offset(pud, va); | |
473 | if (!pmd_present(*pmd)) | |
474 | break; | |
475 | ||
476 | pte = pte_offset_kernel(pmd, va); | |
477 | if (!pte_present(*pte)) | |
478 | break; | |
479 | ||
480 | pte_clear(NULL, va, pte); | |
481 | } | |
6944a9c8 | 482 | paravirt_alloc_pmd(&init_mm, __pa(base) >> PAGE_SHIFT); |
b239fb25 JF |
483 | } |
484 | ||
485 | void __init native_pagetable_setup_done(pgd_t *base) | |
486 | { | |
b239fb25 JF |
487 | } |
488 | ||
489 | /* | |
490 | * Build a proper pagetable for the kernel mappings. Up until this | |
491 | * point, we've been running on some set of pagetables constructed by | |
492 | * the boot process. | |
493 | * | |
494 | * If we're booting on native hardware, this will be a pagetable | |
551889a6 IC |
495 | * constructed in arch/x86/kernel/head_32.S. The root of the |
496 | * pagetable will be swapper_pg_dir. | |
b239fb25 JF |
497 | * |
498 | * If we're booting paravirtualized under a hypervisor, then there are | |
499 | * more options: we may already be running PAE, and the pagetable may | |
500 | * or may not be based in swapper_pg_dir. In any case, | |
501 | * paravirt_pagetable_setup_start() will set up swapper_pg_dir | |
502 | * appropriately for the rest of the initialization to work. | |
503 | * | |
504 | * In general, pagetable_init() assumes that the pagetable may already | |
505 | * be partially populated, and so it avoids stomping on any existing | |
506 | * mappings. | |
507 | */ | |
f765090a | 508 | void __init early_ioremap_page_table_range_init(void) |
b239fb25 | 509 | { |
e7179853 | 510 | pgd_t *pgd_base = swapper_pg_dir; |
8550eb99 | 511 | unsigned long vaddr, end; |
b239fb25 | 512 | |
1da177e4 LT |
513 | /* |
514 | * Fixed mappings, only the page table structure has to be | |
515 | * created - mappings will be set by set_fixmap(): | |
516 | */ | |
517 | vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK; | |
b239fb25 JF |
518 | end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK; |
519 | page_table_range_init(vaddr, end, pgd_base); | |
beacfaac | 520 | early_ioremap_reset(); |
e7b37895 YL |
521 | } |
522 | ||
523 | static void __init pagetable_init(void) | |
524 | { | |
525 | pgd_t *pgd_base = swapper_pg_dir; | |
526 | ||
1da177e4 | 527 | permanent_kmaps_init(pgd_base); |
1da177e4 LT |
528 | } |
529 | ||
a6eb84bc | 530 | #ifdef CONFIG_ACPI_SLEEP |
1da177e4 | 531 | /* |
a6eb84bc | 532 | * ACPI suspend needs this for resume, because things like the intel-agp |
1da177e4 LT |
533 | * driver might have split up a kernel 4MB mapping. |
534 | */ | |
a6eb84bc | 535 | char swsusp_pg_dir[PAGE_SIZE] |
8550eb99 | 536 | __attribute__ ((aligned(PAGE_SIZE))); |
1da177e4 LT |
537 | |
538 | static inline void save_pg_dir(void) | |
539 | { | |
540 | memcpy(swsusp_pg_dir, swapper_pg_dir, PAGE_SIZE); | |
541 | } | |
a6eb84bc | 542 | #else /* !CONFIG_ACPI_SLEEP */ |
1da177e4 LT |
543 | static inline void save_pg_dir(void) |
544 | { | |
545 | } | |
a6eb84bc | 546 | #endif /* !CONFIG_ACPI_SLEEP */ |
1da177e4 | 547 | |
8550eb99 | 548 | void zap_low_mappings(void) |
1da177e4 LT |
549 | { |
550 | int i; | |
551 | ||
1da177e4 LT |
552 | /* |
553 | * Zap initial low-memory mappings. | |
554 | * | |
555 | * Note that "pgd_clear()" doesn't do it for | |
556 | * us, because pgd_clear() is a no-op on i386. | |
557 | */ | |
68db065c | 558 | for (i = 0; i < KERNEL_PGD_BOUNDARY; i++) { |
1da177e4 LT |
559 | #ifdef CONFIG_X86_PAE |
560 | set_pgd(swapper_pg_dir+i, __pgd(1 + __pa(empty_zero_page))); | |
561 | #else | |
562 | set_pgd(swapper_pg_dir+i, __pgd(0)); | |
563 | #endif | |
8550eb99 | 564 | } |
1da177e4 LT |
565 | flush_tlb_all(); |
566 | } | |
567 | ||
8550eb99 | 568 | int nx_enabled; |
d5321abe | 569 | |
be43d728 | 570 | pteval_t __supported_pte_mask __read_mostly = ~(_PAGE_NX | _PAGE_GLOBAL | _PAGE_IOMAP); |
6fdc05d4 JF |
571 | EXPORT_SYMBOL_GPL(__supported_pte_mask); |
572 | ||
d5321abe JB |
573 | #ifdef CONFIG_X86_PAE |
574 | ||
8550eb99 | 575 | static int disable_nx __initdata; |
1da177e4 LT |
576 | |
577 | /* | |
578 | * noexec = on|off | |
579 | * | |
580 | * Control non executable mappings. | |
581 | * | |
582 | * on Enable | |
583 | * off Disable | |
584 | */ | |
1a3f239d | 585 | static int __init noexec_setup(char *str) |
1da177e4 | 586 | { |
1a3f239d RR |
587 | if (!str || !strcmp(str, "on")) { |
588 | if (cpu_has_nx) { | |
589 | __supported_pte_mask |= _PAGE_NX; | |
590 | disable_nx = 0; | |
591 | } | |
8550eb99 IM |
592 | } else { |
593 | if (!strcmp(str, "off")) { | |
594 | disable_nx = 1; | |
595 | __supported_pte_mask &= ~_PAGE_NX; | |
596 | } else { | |
597 | return -EINVAL; | |
598 | } | |
599 | } | |
1a3f239d RR |
600 | |
601 | return 0; | |
1da177e4 | 602 | } |
1a3f239d | 603 | early_param("noexec", noexec_setup); |
1da177e4 | 604 | |
1da177e4 LT |
605 | static void __init set_nx(void) |
606 | { | |
607 | unsigned int v[4], l, h; | |
608 | ||
609 | if (cpu_has_pae && (cpuid_eax(0x80000000) > 0x80000001)) { | |
610 | cpuid(0x80000001, &v[0], &v[1], &v[2], &v[3]); | |
8550eb99 | 611 | |
1da177e4 LT |
612 | if ((v[3] & (1 << 20)) && !disable_nx) { |
613 | rdmsr(MSR_EFER, l, h); | |
614 | l |= EFER_NX; | |
615 | wrmsr(MSR_EFER, l, h); | |
616 | nx_enabled = 1; | |
617 | __supported_pte_mask |= _PAGE_NX; | |
618 | } | |
619 | } | |
620 | } | |
1da177e4 LT |
621 | #endif |
622 | ||
90d967e0 YL |
623 | /* user-defined highmem size */ |
624 | static unsigned int highmem_pages = -1; | |
625 | ||
626 | /* | |
627 | * highmem=size forces highmem to be exactly 'size' bytes. | |
628 | * This works even on boxes that have no highmem otherwise. | |
629 | * This also works to reduce highmem size on bigger boxes. | |
630 | */ | |
631 | static int __init parse_highmem(char *arg) | |
632 | { | |
633 | if (!arg) | |
634 | return -EINVAL; | |
635 | ||
636 | highmem_pages = memparse(arg, &arg) >> PAGE_SHIFT; | |
637 | return 0; | |
638 | } | |
639 | early_param("highmem", parse_highmem); | |
640 | ||
4769843b IM |
641 | #define MSG_HIGHMEM_TOO_BIG \ |
642 | "highmem size (%luMB) is bigger than pages available (%luMB)!\n" | |
643 | ||
644 | #define MSG_LOWMEM_TOO_SMALL \ | |
645 | "highmem size (%luMB) results in <64MB lowmem, ignoring it!\n" | |
90d967e0 | 646 | /* |
4769843b IM |
647 | * All of RAM fits into lowmem - but if user wants highmem |
648 | * artificially via the highmem=x boot parameter then create | |
649 | * it: | |
90d967e0 | 650 | */ |
4769843b | 651 | void __init lowmem_pfn_init(void) |
90d967e0 | 652 | { |
346cafec | 653 | /* max_low_pfn is 0, we already have early_res support */ |
90d967e0 | 654 | max_low_pfn = max_pfn; |
d88316c2 | 655 | |
4769843b IM |
656 | if (highmem_pages == -1) |
657 | highmem_pages = 0; | |
658 | #ifdef CONFIG_HIGHMEM | |
659 | if (highmem_pages >= max_pfn) { | |
660 | printk(KERN_ERR MSG_HIGHMEM_TOO_BIG, | |
661 | pages_to_mb(highmem_pages), pages_to_mb(max_pfn)); | |
662 | highmem_pages = 0; | |
663 | } | |
664 | if (highmem_pages) { | |
665 | if (max_low_pfn - highmem_pages < 64*1024*1024/PAGE_SIZE) { | |
666 | printk(KERN_ERR MSG_LOWMEM_TOO_SMALL, | |
90d967e0 YL |
667 | pages_to_mb(highmem_pages)); |
668 | highmem_pages = 0; | |
669 | } | |
4769843b IM |
670 | max_low_pfn -= highmem_pages; |
671 | } | |
672 | #else | |
673 | if (highmem_pages) | |
674 | printk(KERN_ERR "ignoring highmem size on non-highmem kernel!\n"); | |
675 | #endif | |
676 | } | |
677 | ||
678 | #define MSG_HIGHMEM_TOO_SMALL \ | |
679 | "only %luMB highmem pages available, ignoring highmem size of %luMB!\n" | |
680 | ||
681 | #define MSG_HIGHMEM_TRIMMED \ | |
682 | "Warning: only 4GB will be used. Use a HIGHMEM64G enabled kernel!\n" | |
683 | /* | |
684 | * We have more RAM than fits into lowmem - we try to put it into | |
685 | * highmem, also taking the highmem=x boot parameter into account: | |
686 | */ | |
687 | void __init highmem_pfn_init(void) | |
688 | { | |
d88316c2 IM |
689 | max_low_pfn = MAXMEM_PFN; |
690 | ||
4769843b IM |
691 | if (highmem_pages == -1) |
692 | highmem_pages = max_pfn - MAXMEM_PFN; | |
693 | ||
694 | if (highmem_pages + MAXMEM_PFN < max_pfn) | |
695 | max_pfn = MAXMEM_PFN + highmem_pages; | |
696 | ||
697 | if (highmem_pages + MAXMEM_PFN > max_pfn) { | |
698 | printk(KERN_WARNING MSG_HIGHMEM_TOO_SMALL, | |
699 | pages_to_mb(max_pfn - MAXMEM_PFN), | |
700 | pages_to_mb(highmem_pages)); | |
701 | highmem_pages = 0; | |
702 | } | |
90d967e0 | 703 | #ifndef CONFIG_HIGHMEM |
4769843b IM |
704 | /* Maximum memory usable is what is directly addressable */ |
705 | printk(KERN_WARNING "Warning only %ldMB will be used.\n", MAXMEM>>20); | |
706 | if (max_pfn > MAX_NONPAE_PFN) | |
707 | printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n"); | |
708 | else | |
709 | printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n"); | |
710 | max_pfn = MAXMEM_PFN; | |
90d967e0 YL |
711 | #else /* !CONFIG_HIGHMEM */ |
712 | #ifndef CONFIG_HIGHMEM64G | |
4769843b IM |
713 | if (max_pfn > MAX_NONPAE_PFN) { |
714 | max_pfn = MAX_NONPAE_PFN; | |
715 | printk(KERN_WARNING MSG_HIGHMEM_TRIMMED); | |
716 | } | |
90d967e0 YL |
717 | #endif /* !CONFIG_HIGHMEM64G */ |
718 | #endif /* !CONFIG_HIGHMEM */ | |
4769843b IM |
719 | } |
720 | ||
721 | /* | |
722 | * Determine low and high memory ranges: | |
723 | */ | |
724 | void __init find_low_pfn_range(void) | |
725 | { | |
726 | /* it could update max_pfn */ | |
727 | ||
d88316c2 | 728 | if (max_pfn <= MAXMEM_PFN) |
4769843b | 729 | lowmem_pfn_init(); |
d88316c2 IM |
730 | else |
731 | highmem_pfn_init(); | |
90d967e0 YL |
732 | } |
733 | ||
b2ac82a0 | 734 | #ifndef CONFIG_NEED_MULTIPLE_NODES |
2ec65f8b | 735 | void __init initmem_init(unsigned long start_pfn, |
b2ac82a0 YL |
736 | unsigned long end_pfn) |
737 | { | |
b2ac82a0 YL |
738 | #ifdef CONFIG_HIGHMEM |
739 | highstart_pfn = highend_pfn = max_pfn; | |
740 | if (max_pfn > max_low_pfn) | |
741 | highstart_pfn = max_low_pfn; | |
742 | memory_present(0, 0, highend_pfn); | |
cb95a13a | 743 | e820_register_active_regions(0, 0, highend_pfn); |
b2ac82a0 YL |
744 | printk(KERN_NOTICE "%ldMB HIGHMEM available.\n", |
745 | pages_to_mb(highend_pfn - highstart_pfn)); | |
746 | num_physpages = highend_pfn; | |
747 | high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1; | |
748 | #else | |
749 | memory_present(0, 0, max_low_pfn); | |
cb95a13a | 750 | e820_register_active_regions(0, 0, max_low_pfn); |
b2ac82a0 YL |
751 | num_physpages = max_low_pfn; |
752 | high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1; | |
753 | #endif | |
754 | #ifdef CONFIG_FLATMEM | |
755 | max_mapnr = num_physpages; | |
756 | #endif | |
757 | printk(KERN_NOTICE "%ldMB LOWMEM available.\n", | |
758 | pages_to_mb(max_low_pfn)); | |
759 | ||
760 | setup_bootmem_allocator(); | |
b2ac82a0 | 761 | } |
cb95a13a | 762 | #endif /* !CONFIG_NEED_MULTIPLE_NODES */ |
b2ac82a0 | 763 | |
cb95a13a | 764 | static void __init zone_sizes_init(void) |
b2ac82a0 YL |
765 | { |
766 | unsigned long max_zone_pfns[MAX_NR_ZONES]; | |
767 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); | |
768 | max_zone_pfns[ZONE_DMA] = | |
769 | virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT; | |
770 | max_zone_pfns[ZONE_NORMAL] = max_low_pfn; | |
b2ac82a0 YL |
771 | #ifdef CONFIG_HIGHMEM |
772 | max_zone_pfns[ZONE_HIGHMEM] = highend_pfn; | |
b2ac82a0 YL |
773 | #endif |
774 | ||
775 | free_area_init_nodes(max_zone_pfns); | |
776 | } | |
b2ac82a0 | 777 | |
a71edd1f YL |
778 | static unsigned long __init setup_node_bootmem(int nodeid, |
779 | unsigned long start_pfn, | |
780 | unsigned long end_pfn, | |
781 | unsigned long bootmap) | |
782 | { | |
783 | unsigned long bootmap_size; | |
784 | ||
785 | if (start_pfn > max_low_pfn) | |
786 | return bootmap; | |
787 | if (end_pfn > max_low_pfn) | |
788 | end_pfn = max_low_pfn; | |
789 | ||
790 | /* don't touch min_low_pfn */ | |
791 | bootmap_size = init_bootmem_node(NODE_DATA(nodeid), | |
792 | bootmap >> PAGE_SHIFT, | |
793 | start_pfn, end_pfn); | |
794 | printk(KERN_INFO " node %d low ram: %08lx - %08lx\n", | |
795 | nodeid, start_pfn<<PAGE_SHIFT, end_pfn<<PAGE_SHIFT); | |
796 | printk(KERN_INFO " node %d bootmap %08lx - %08lx\n", | |
797 | nodeid, bootmap, bootmap + bootmap_size); | |
798 | free_bootmem_with_active_regions(nodeid, end_pfn); | |
799 | early_res_to_bootmem(start_pfn<<PAGE_SHIFT, end_pfn<<PAGE_SHIFT); | |
800 | ||
801 | return bootmap + bootmap_size; | |
802 | } | |
a71edd1f | 803 | |
b2ac82a0 YL |
804 | void __init setup_bootmem_allocator(void) |
805 | { | |
a71edd1f | 806 | int nodeid; |
b2ac82a0 YL |
807 | unsigned long bootmap_size, bootmap; |
808 | /* | |
809 | * Initialize the boot-time allocator (with low memory only): | |
810 | */ | |
811 | bootmap_size = bootmem_bootmap_pages(max_low_pfn)<<PAGE_SHIFT; | |
fc5efe39 | 812 | bootmap = find_e820_area(0, max_pfn_mapped<<PAGE_SHIFT, bootmap_size, |
b2ac82a0 YL |
813 | PAGE_SIZE); |
814 | if (bootmap == -1L) | |
815 | panic("Cannot find bootmem map of size %ld\n", bootmap_size); | |
816 | reserve_early(bootmap, bootmap + bootmap_size, "BOOTMAP"); | |
225c37d7 | 817 | |
b2ac82a0 YL |
818 | printk(KERN_INFO " mapped low ram: 0 - %08lx\n", |
819 | max_pfn_mapped<<PAGE_SHIFT); | |
fc5efe39 | 820 | printk(KERN_INFO " low ram: 0 - %08lx\n", max_low_pfn<<PAGE_SHIFT); |
a71edd1f YL |
821 | |
822 | #ifdef CONFIG_NEED_MULTIPLE_NODES | |
823 | for_each_online_node(nodeid) | |
824 | bootmap = setup_node_bootmem(nodeid, node_start_pfn[nodeid], | |
825 | node_end_pfn[nodeid], bootmap); | |
826 | #else | |
fc5efe39 | 827 | bootmap = setup_node_bootmem(0, 0, max_low_pfn, bootmap); |
a71edd1f | 828 | #endif |
b2ac82a0 | 829 | |
c464573c | 830 | after_bootmem = 1; |
b2ac82a0 YL |
831 | } |
832 | ||
1da177e4 LT |
833 | /* |
834 | * paging_init() sets up the page tables - note that the first 8MB are | |
835 | * already mapped by head.S. | |
836 | * | |
837 | * This routines also unmaps the page at virtual kernel address 0, so | |
838 | * that we can trap those pesky NULL-reference errors in the kernel. | |
839 | */ | |
840 | void __init paging_init(void) | |
841 | { | |
1da177e4 LT |
842 | pagetable_init(); |
843 | ||
1da177e4 LT |
844 | __flush_tlb_all(); |
845 | ||
846 | kmap_init(); | |
11cd0bc1 YL |
847 | |
848 | /* | |
849 | * NOTE: at this point the bootmem allocator is fully available. | |
850 | */ | |
11cd0bc1 YL |
851 | sparse_init(); |
852 | zone_sizes_init(); | |
1da177e4 LT |
853 | } |
854 | ||
855 | /* | |
856 | * Test if the WP bit works in supervisor mode. It isn't supported on 386's | |
f7f17a67 DV |
857 | * and also on some strange 486's. All 586+'s are OK. This used to involve |
858 | * black magic jumps to work around some nasty CPU bugs, but fortunately the | |
859 | * switch to using exceptions got rid of all that. | |
1da177e4 | 860 | */ |
1da177e4 LT |
861 | static void __init test_wp_bit(void) |
862 | { | |
d7d119d7 IM |
863 | printk(KERN_INFO |
864 | "Checking if this processor honours the WP bit even in supervisor mode..."); | |
1da177e4 LT |
865 | |
866 | /* Any page-aligned address will do, the test is non-destructive */ | |
867 | __set_fixmap(FIX_WP_TEST, __pa(&swapper_pg_dir), PAGE_READONLY); | |
868 | boot_cpu_data.wp_works_ok = do_test_wp_bit(); | |
869 | clear_fixmap(FIX_WP_TEST); | |
870 | ||
871 | if (!boot_cpu_data.wp_works_ok) { | |
d7d119d7 | 872 | printk(KERN_CONT "No.\n"); |
1da177e4 | 873 | #ifdef CONFIG_X86_WP_WORKS_OK |
d7d119d7 IM |
874 | panic( |
875 | "This kernel doesn't support CPU's with broken WP. Recompile it for a 386!"); | |
1da177e4 LT |
876 | #endif |
877 | } else { | |
d7d119d7 | 878 | printk(KERN_CONT "Ok.\n"); |
1da177e4 LT |
879 | } |
880 | } | |
881 | ||
8550eb99 | 882 | static struct kcore_list kcore_mem, kcore_vmalloc; |
1da177e4 LT |
883 | |
884 | void __init mem_init(void) | |
885 | { | |
1da177e4 | 886 | int codesize, reservedpages, datasize, initsize; |
cc9f7a0c | 887 | int tmp; |
1da177e4 | 888 | |
cfb80c9e JF |
889 | pci_iommu_alloc(); |
890 | ||
05b79bdc | 891 | #ifdef CONFIG_FLATMEM |
8d8f3cbe | 892 | BUG_ON(!mem_map); |
1da177e4 | 893 | #endif |
1da177e4 LT |
894 | /* this will put all low memory onto the freelists */ |
895 | totalram_pages += free_all_bootmem(); | |
896 | ||
897 | reservedpages = 0; | |
898 | for (tmp = 0; tmp < max_low_pfn; tmp++) | |
899 | /* | |
8550eb99 | 900 | * Only count reserved RAM pages: |
1da177e4 LT |
901 | */ |
902 | if (page_is_ram(tmp) && PageReserved(pfn_to_page(tmp))) | |
903 | reservedpages++; | |
904 | ||
cc9f7a0c | 905 | set_highmem_pages_init(); |
1da177e4 LT |
906 | |
907 | codesize = (unsigned long) &_etext - (unsigned long) &_text; | |
908 | datasize = (unsigned long) &_edata - (unsigned long) &_etext; | |
909 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; | |
910 | ||
8550eb99 IM |
911 | kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT); |
912 | kclist_add(&kcore_vmalloc, (void *)VMALLOC_START, | |
1da177e4 LT |
913 | VMALLOC_END-VMALLOC_START); |
914 | ||
8550eb99 IM |
915 | printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, " |
916 | "%dk reserved, %dk data, %dk init, %ldk highmem)\n", | |
1da177e4 LT |
917 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), |
918 | num_physpages << (PAGE_SHIFT-10), | |
919 | codesize >> 10, | |
920 | reservedpages << (PAGE_SHIFT-10), | |
921 | datasize >> 10, | |
922 | initsize >> 10, | |
923 | (unsigned long) (totalhigh_pages << (PAGE_SHIFT-10)) | |
924 | ); | |
925 | ||
d7d119d7 | 926 | printk(KERN_INFO "virtual kernel memory layout:\n" |
8550eb99 | 927 | " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" |
052e7994 | 928 | #ifdef CONFIG_HIGHMEM |
8550eb99 | 929 | " pkmap : 0x%08lx - 0x%08lx (%4ld kB)\n" |
052e7994 | 930 | #endif |
8550eb99 IM |
931 | " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" |
932 | " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
933 | " .init : 0x%08lx - 0x%08lx (%4ld kB)\n" | |
934 | " .data : 0x%08lx - 0x%08lx (%4ld kB)\n" | |
935 | " .text : 0x%08lx - 0x%08lx (%4ld kB)\n", | |
936 | FIXADDR_START, FIXADDR_TOP, | |
937 | (FIXADDR_TOP - FIXADDR_START) >> 10, | |
052e7994 JF |
938 | |
939 | #ifdef CONFIG_HIGHMEM | |
8550eb99 IM |
940 | PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE, |
941 | (LAST_PKMAP*PAGE_SIZE) >> 10, | |
052e7994 JF |
942 | #endif |
943 | ||
8550eb99 IM |
944 | VMALLOC_START, VMALLOC_END, |
945 | (VMALLOC_END - VMALLOC_START) >> 20, | |
052e7994 | 946 | |
8550eb99 IM |
947 | (unsigned long)__va(0), (unsigned long)high_memory, |
948 | ((unsigned long)high_memory - (unsigned long)__va(0)) >> 20, | |
052e7994 | 949 | |
8550eb99 IM |
950 | (unsigned long)&__init_begin, (unsigned long)&__init_end, |
951 | ((unsigned long)&__init_end - | |
952 | (unsigned long)&__init_begin) >> 10, | |
052e7994 | 953 | |
8550eb99 IM |
954 | (unsigned long)&_etext, (unsigned long)&_edata, |
955 | ((unsigned long)&_edata - (unsigned long)&_etext) >> 10, | |
052e7994 | 956 | |
8550eb99 IM |
957 | (unsigned long)&_text, (unsigned long)&_etext, |
958 | ((unsigned long)&_etext - (unsigned long)&_text) >> 10); | |
052e7994 | 959 | |
beeb4195 JB |
960 | /* |
961 | * Check boundaries twice: Some fundamental inconsistencies can | |
962 | * be detected at build time already. | |
963 | */ | |
964 | #define __FIXADDR_TOP (-PAGE_SIZE) | |
965 | #ifdef CONFIG_HIGHMEM | |
966 | BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP*PAGE_SIZE > FIXADDR_START); | |
967 | BUILD_BUG_ON(VMALLOC_END > PKMAP_BASE); | |
968 | #endif | |
969 | #define high_memory (-128UL << 20) | |
970 | BUILD_BUG_ON(VMALLOC_START >= VMALLOC_END); | |
971 | #undef high_memory | |
972 | #undef __FIXADDR_TOP | |
973 | ||
052e7994 | 974 | #ifdef CONFIG_HIGHMEM |
8550eb99 IM |
975 | BUG_ON(PKMAP_BASE + LAST_PKMAP*PAGE_SIZE > FIXADDR_START); |
976 | BUG_ON(VMALLOC_END > PKMAP_BASE); | |
052e7994 | 977 | #endif |
beeb4195 | 978 | BUG_ON(VMALLOC_START >= VMALLOC_END); |
8550eb99 | 979 | BUG_ON((unsigned long)high_memory > VMALLOC_START); |
052e7994 | 980 | |
1da177e4 LT |
981 | if (boot_cpu_data.wp_works_ok < 0) |
982 | test_wp_bit(); | |
983 | ||
61165d7a | 984 | save_pg_dir(); |
1da177e4 | 985 | zap_low_mappings(); |
1da177e4 LT |
986 | } |
987 | ||
ad8f5797 | 988 | #ifdef CONFIG_MEMORY_HOTPLUG |
bc02af93 | 989 | int arch_add_memory(int nid, u64 start, u64 size) |
05039b92 | 990 | { |
7c7e9425 | 991 | struct pglist_data *pgdata = NODE_DATA(nid); |
776ed98b | 992 | struct zone *zone = pgdata->node_zones + ZONE_HIGHMEM; |
05039b92 DH |
993 | unsigned long start_pfn = start >> PAGE_SHIFT; |
994 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
995 | ||
c04fc586 | 996 | return __add_pages(nid, zone, start_pfn, nr_pages); |
05039b92 | 997 | } |
9d99aaa3 | 998 | #endif |
05039b92 | 999 | |
1da177e4 LT |
1000 | /* |
1001 | * This function cannot be __init, since exceptions don't work in that | |
1002 | * section. Put this after the callers, so that it cannot be inlined. | |
1003 | */ | |
8550eb99 | 1004 | static noinline int do_test_wp_bit(void) |
1da177e4 LT |
1005 | { |
1006 | char tmp_reg; | |
1007 | int flag; | |
1008 | ||
1009 | __asm__ __volatile__( | |
8550eb99 IM |
1010 | " movb %0, %1 \n" |
1011 | "1: movb %1, %0 \n" | |
1012 | " xorl %2, %2 \n" | |
1da177e4 | 1013 | "2: \n" |
f832ff18 | 1014 | _ASM_EXTABLE(1b,2b) |
1da177e4 LT |
1015 | :"=m" (*(char *)fix_to_virt(FIX_WP_TEST)), |
1016 | "=q" (tmp_reg), | |
1017 | "=r" (flag) | |
1018 | :"2" (1) | |
1019 | :"memory"); | |
8550eb99 | 1020 | |
1da177e4 LT |
1021 | return flag; |
1022 | } | |
1023 | ||
63aaf308 | 1024 | #ifdef CONFIG_DEBUG_RODATA |
edeed305 AV |
1025 | const int rodata_test_data = 0xC3; |
1026 | EXPORT_SYMBOL_GPL(rodata_test_data); | |
63aaf308 | 1027 | |
63aaf308 AV |
1028 | void mark_rodata_ro(void) |
1029 | { | |
6fb14755 JB |
1030 | unsigned long start = PFN_ALIGN(_text); |
1031 | unsigned long size = PFN_ALIGN(_etext) - start; | |
63aaf308 | 1032 | |
8f0f996e SR |
1033 | #ifndef CONFIG_DYNAMIC_FTRACE |
1034 | /* Dynamic tracing modifies the kernel text section */ | |
4e4eee0e MD |
1035 | set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT); |
1036 | printk(KERN_INFO "Write protecting the kernel text: %luk\n", | |
1037 | size >> 10); | |
0c42f392 AK |
1038 | |
1039 | #ifdef CONFIG_CPA_DEBUG | |
4e4eee0e MD |
1040 | printk(KERN_INFO "Testing CPA: Reverting %lx-%lx\n", |
1041 | start, start+size); | |
1042 | set_pages_rw(virt_to_page(start), size>>PAGE_SHIFT); | |
0c42f392 | 1043 | |
4e4eee0e MD |
1044 | printk(KERN_INFO "Testing CPA: write protecting again\n"); |
1045 | set_pages_ro(virt_to_page(start), size>>PAGE_SHIFT); | |
602033ed | 1046 | #endif |
8f0f996e SR |
1047 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
1048 | ||
6fb14755 JB |
1049 | start += size; |
1050 | size = (unsigned long)__end_rodata - start; | |
6d238cc4 | 1051 | set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT); |
d7d119d7 IM |
1052 | printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n", |
1053 | size >> 10); | |
edeed305 | 1054 | rodata_test(); |
63aaf308 | 1055 | |
0c42f392 | 1056 | #ifdef CONFIG_CPA_DEBUG |
d7d119d7 | 1057 | printk(KERN_INFO "Testing CPA: undo %lx-%lx\n", start, start + size); |
6d238cc4 | 1058 | set_pages_rw(virt_to_page(start), size >> PAGE_SHIFT); |
0c42f392 | 1059 | |
d7d119d7 | 1060 | printk(KERN_INFO "Testing CPA: write protecting again\n"); |
6d238cc4 | 1061 | set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT); |
0c42f392 | 1062 | #endif |
63aaf308 AV |
1063 | } |
1064 | #endif | |
1065 | ||
d2dbf343 YL |
1066 | int __init reserve_bootmem_generic(unsigned long phys, unsigned long len, |
1067 | int flags) | |
1068 | { | |
1069 | return reserve_bootmem(phys, len, flags); | |
1070 | } |