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 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> |
2b72394e | 52 | #include <asm/page_types.h> |
4fcb2083 | 53 | #include <asm/init.h> |
1da177e4 | 54 | |
1da177e4 LT |
55 | unsigned long highstart_pfn, highend_pfn; |
56 | ||
8550eb99 | 57 | static noinline int do_test_wp_bit(void); |
1da177e4 | 58 | |
dc16ecf7 | 59 | bool __read_mostly __vmalloc_start_set = false; |
4e29684c | 60 | |
d6be89ad | 61 | static __init void *alloc_low_page(void) |
4e29684c | 62 | { |
298af9d8 | 63 | unsigned long pfn = e820_table_end++; |
4e29684c YL |
64 | void *adr; |
65 | ||
298af9d8 | 66 | if (pfn >= e820_table_top) |
4e29684c YL |
67 | panic("alloc_low_page: ran out of memory"); |
68 | ||
69 | adr = __va(pfn * PAGE_SIZE); | |
70 | memset(adr, 0, PAGE_SIZE); | |
4e29684c YL |
71 | return adr; |
72 | } | |
73 | ||
1da177e4 LT |
74 | /* |
75 | * Creates a middle page table and puts a pointer to it in the | |
76 | * given global directory entry. This only returns the gd entry | |
77 | * in non-PAE compilation mode, since the middle layer is folded. | |
78 | */ | |
79 | static pmd_t * __init one_md_table_init(pgd_t *pgd) | |
80 | { | |
81 | pud_t *pud; | |
82 | pmd_t *pmd_table; | |
8550eb99 | 83 | |
1da177e4 | 84 | #ifdef CONFIG_X86_PAE |
b239fb25 | 85 | if (!(pgd_val(*pgd) & _PAGE_PRESENT)) { |
c464573c | 86 | if (after_bootmem) |
3c1596ef | 87 | pmd_table = (pmd_t *)alloc_bootmem_pages(PAGE_SIZE); |
4e29684c | 88 | else |
d6be89ad | 89 | pmd_table = (pmd_t *)alloc_low_page(); |
6944a9c8 | 90 | paravirt_alloc_pmd(&init_mm, __pa(pmd_table) >> PAGE_SHIFT); |
b239fb25 JF |
91 | set_pgd(pgd, __pgd(__pa(pmd_table) | _PAGE_PRESENT)); |
92 | pud = pud_offset(pgd, 0); | |
8550eb99 | 93 | BUG_ON(pmd_table != pmd_offset(pud, 0)); |
a376f30a Z |
94 | |
95 | return pmd_table; | |
b239fb25 JF |
96 | } |
97 | #endif | |
1da177e4 LT |
98 | pud = pud_offset(pgd, 0); |
99 | pmd_table = pmd_offset(pud, 0); | |
8550eb99 | 100 | |
1da177e4 LT |
101 | return pmd_table; |
102 | } | |
103 | ||
104 | /* | |
105 | * Create a page table and place a pointer to it in a middle page | |
8550eb99 | 106 | * directory entry: |
1da177e4 LT |
107 | */ |
108 | static pte_t * __init one_page_table_init(pmd_t *pmd) | |
109 | { | |
b239fb25 | 110 | if (!(pmd_val(*pmd) & _PAGE_PRESENT)) { |
509a80c4 IM |
111 | pte_t *page_table = NULL; |
112 | ||
c464573c | 113 | if (after_bootmem) { |
f8561296 | 114 | #if defined(CONFIG_DEBUG_PAGEALLOC) || defined(CONFIG_KMEMCHECK) |
4e29684c | 115 | page_table = (pte_t *) alloc_bootmem_pages(PAGE_SIZE); |
509a80c4 | 116 | #endif |
4e29684c YL |
117 | if (!page_table) |
118 | page_table = | |
3c1596ef | 119 | (pte_t *)alloc_bootmem_pages(PAGE_SIZE); |
d6be89ad JB |
120 | } else |
121 | page_table = (pte_t *)alloc_low_page(); | |
b239fb25 | 122 | |
6944a9c8 | 123 | paravirt_alloc_pte(&init_mm, __pa(page_table) >> PAGE_SHIFT); |
1da177e4 | 124 | set_pmd(pmd, __pmd(__pa(page_table) | _PAGE_TABLE)); |
b239fb25 | 125 | BUG_ON(page_table != pte_offset_kernel(pmd, 0)); |
1da177e4 | 126 | } |
509a80c4 | 127 | |
1da177e4 LT |
128 | return pte_offset_kernel(pmd, 0); |
129 | } | |
130 | ||
458a3e64 | 131 | pmd_t * __init populate_extra_pmd(unsigned long vaddr) |
11124411 TH |
132 | { |
133 | int pgd_idx = pgd_index(vaddr); | |
134 | int pmd_idx = pmd_index(vaddr); | |
458a3e64 TH |
135 | |
136 | return one_md_table_init(swapper_pg_dir + pgd_idx) + pmd_idx; | |
137 | } | |
138 | ||
139 | pte_t * __init populate_extra_pte(unsigned long vaddr) | |
140 | { | |
141 | int pte_idx = pte_index(vaddr); | |
11124411 TH |
142 | pmd_t *pmd; |
143 | ||
458a3e64 TH |
144 | pmd = populate_extra_pmd(vaddr); |
145 | return one_page_table_init(pmd) + pte_idx; | |
11124411 TH |
146 | } |
147 | ||
a3c6018e JB |
148 | static pte_t *__init page_table_kmap_check(pte_t *pte, pmd_t *pmd, |
149 | unsigned long vaddr, pte_t *lastpte) | |
150 | { | |
151 | #ifdef CONFIG_HIGHMEM | |
152 | /* | |
153 | * Something (early fixmap) may already have put a pte | |
154 | * page here, which causes the page table allocation | |
155 | * to become nonlinear. Attempt to fix it, and if it | |
156 | * is still nonlinear then we have to bug. | |
157 | */ | |
158 | int pmd_idx_kmap_begin = fix_to_virt(FIX_KMAP_END) >> PMD_SHIFT; | |
159 | int pmd_idx_kmap_end = fix_to_virt(FIX_KMAP_BEGIN) >> PMD_SHIFT; | |
160 | ||
161 | if (pmd_idx_kmap_begin != pmd_idx_kmap_end | |
162 | && (vaddr >> PMD_SHIFT) >= pmd_idx_kmap_begin | |
163 | && (vaddr >> PMD_SHIFT) <= pmd_idx_kmap_end | |
298af9d8 PE |
164 | && ((__pa(pte) >> PAGE_SHIFT) < e820_table_start |
165 | || (__pa(pte) >> PAGE_SHIFT) >= e820_table_end)) { | |
a3c6018e JB |
166 | pte_t *newpte; |
167 | int i; | |
168 | ||
c464573c | 169 | BUG_ON(after_bootmem); |
a3c6018e JB |
170 | newpte = alloc_low_page(); |
171 | for (i = 0; i < PTRS_PER_PTE; i++) | |
172 | set_pte(newpte + i, pte[i]); | |
173 | ||
174 | paravirt_alloc_pte(&init_mm, __pa(newpte) >> PAGE_SHIFT); | |
175 | set_pmd(pmd, __pmd(__pa(newpte)|_PAGE_TABLE)); | |
176 | BUG_ON(newpte != pte_offset_kernel(pmd, 0)); | |
177 | __flush_tlb_all(); | |
178 | ||
179 | paravirt_release_pte(__pa(pte) >> PAGE_SHIFT); | |
180 | pte = newpte; | |
181 | } | |
182 | BUG_ON(vaddr < fix_to_virt(FIX_KMAP_BEGIN - 1) | |
183 | && vaddr > fix_to_virt(FIX_KMAP_END) | |
184 | && lastpte && lastpte + PTRS_PER_PTE != pte); | |
185 | #endif | |
186 | return pte; | |
187 | } | |
188 | ||
1da177e4 | 189 | /* |
8550eb99 | 190 | * This function initializes a certain range of kernel virtual memory |
1da177e4 LT |
191 | * with new bootmem page tables, everywhere page tables are missing in |
192 | * the given range. | |
8550eb99 IM |
193 | * |
194 | * NOTE: The pagetables are allocated contiguous on the physical space | |
195 | * so we can cache the place of the first one and move around without | |
1da177e4 LT |
196 | * checking the pgd every time. |
197 | */ | |
8550eb99 IM |
198 | static void __init |
199 | page_table_range_init(unsigned long start, unsigned long end, pgd_t *pgd_base) | |
1da177e4 | 200 | { |
1da177e4 LT |
201 | int pgd_idx, pmd_idx; |
202 | unsigned long vaddr; | |
8550eb99 IM |
203 | pgd_t *pgd; |
204 | pmd_t *pmd; | |
a3c6018e | 205 | pte_t *pte = NULL; |
1da177e4 LT |
206 | |
207 | vaddr = start; | |
208 | pgd_idx = pgd_index(vaddr); | |
209 | pmd_idx = pmd_index(vaddr); | |
210 | pgd = pgd_base + pgd_idx; | |
211 | ||
212 | for ( ; (pgd_idx < PTRS_PER_PGD) && (vaddr != end); pgd++, pgd_idx++) { | |
b239fb25 JF |
213 | pmd = one_md_table_init(pgd); |
214 | pmd = pmd + pmd_index(vaddr); | |
8550eb99 IM |
215 | for (; (pmd_idx < PTRS_PER_PMD) && (vaddr != end); |
216 | pmd++, pmd_idx++) { | |
a3c6018e JB |
217 | pte = page_table_kmap_check(one_page_table_init(pmd), |
218 | pmd, vaddr, pte); | |
1da177e4 LT |
219 | |
220 | vaddr += PMD_SIZE; | |
221 | } | |
222 | pmd_idx = 0; | |
223 | } | |
224 | } | |
225 | ||
226 | static inline int is_kernel_text(unsigned long addr) | |
227 | { | |
228 | if (addr >= PAGE_OFFSET && addr <= (unsigned long)__init_end) | |
229 | return 1; | |
230 | return 0; | |
231 | } | |
232 | ||
233 | /* | |
8550eb99 IM |
234 | * This maps the physical memory to kernel virtual address space, a total |
235 | * of max_low_pfn pages, by creating page tables starting from address | |
236 | * PAGE_OFFSET: | |
1da177e4 | 237 | */ |
e53fb04f PE |
238 | unsigned long __init |
239 | kernel_physical_mapping_init(unsigned long start, | |
240 | unsigned long end, | |
241 | unsigned long page_size_mask) | |
1da177e4 | 242 | { |
e53fb04f | 243 | int use_pse = page_size_mask == (1<<PG_LEVEL_2M); |
c1fd1b43 | 244 | unsigned long last_map_addr = end; |
e53fb04f | 245 | unsigned long start_pfn, end_pfn; |
e7179853 | 246 | pgd_t *pgd_base = swapper_pg_dir; |
8550eb99 | 247 | int pgd_idx, pmd_idx, pte_ofs; |
1da177e4 LT |
248 | unsigned long pfn; |
249 | pgd_t *pgd; | |
250 | pmd_t *pmd; | |
251 | pte_t *pte; | |
a2699e47 SS |
252 | unsigned pages_2m, pages_4k; |
253 | int mapping_iter; | |
254 | ||
e53fb04f PE |
255 | start_pfn = start >> PAGE_SHIFT; |
256 | end_pfn = end >> PAGE_SHIFT; | |
257 | ||
a2699e47 SS |
258 | /* |
259 | * First iteration will setup identity mapping using large/small pages | |
260 | * based on use_pse, with other attributes same as set by | |
261 | * the early code in head_32.S | |
262 | * | |
263 | * Second iteration will setup the appropriate attributes (NX, GLOBAL..) | |
264 | * as desired for the kernel identity mapping. | |
265 | * | |
266 | * This two pass mechanism conforms to the TLB app note which says: | |
267 | * | |
268 | * "Software should not write to a paging-structure entry in a way | |
269 | * that would change, for any linear address, both the page size | |
270 | * and either the page frame or attributes." | |
271 | */ | |
272 | mapping_iter = 1; | |
1da177e4 | 273 | |
a04ad82d YL |
274 | if (!cpu_has_pse) |
275 | use_pse = 0; | |
1da177e4 | 276 | |
a2699e47 SS |
277 | repeat: |
278 | pages_2m = pages_4k = 0; | |
a04ad82d YL |
279 | pfn = start_pfn; |
280 | pgd_idx = pgd_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET); | |
281 | pgd = pgd_base + pgd_idx; | |
1da177e4 LT |
282 | for (; pgd_idx < PTRS_PER_PGD; pgd++, pgd_idx++) { |
283 | pmd = one_md_table_init(pgd); | |
8550eb99 | 284 | |
a04ad82d YL |
285 | if (pfn >= end_pfn) |
286 | continue; | |
287 | #ifdef CONFIG_X86_PAE | |
288 | pmd_idx = pmd_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET); | |
289 | pmd += pmd_idx; | |
290 | #else | |
291 | pmd_idx = 0; | |
292 | #endif | |
293 | for (; pmd_idx < PTRS_PER_PMD && pfn < end_pfn; | |
f3f20de8 | 294 | pmd++, pmd_idx++) { |
8550eb99 | 295 | unsigned int addr = pfn * PAGE_SIZE + PAGE_OFFSET; |
1da177e4 | 296 | |
8550eb99 IM |
297 | /* |
298 | * Map with big pages if possible, otherwise | |
299 | * create normal page tables: | |
300 | */ | |
a04ad82d | 301 | if (use_pse) { |
8550eb99 | 302 | unsigned int addr2; |
f3f20de8 | 303 | pgprot_t prot = PAGE_KERNEL_LARGE; |
a2699e47 SS |
304 | /* |
305 | * first pass will use the same initial | |
306 | * identity mapping attribute + _PAGE_PSE. | |
307 | */ | |
308 | pgprot_t init_prot = | |
309 | __pgprot(PTE_IDENT_ATTR | | |
310 | _PAGE_PSE); | |
f3f20de8 | 311 | |
8550eb99 | 312 | addr2 = (pfn + PTRS_PER_PTE-1) * PAGE_SIZE + |
f3f20de8 JF |
313 | PAGE_OFFSET + PAGE_SIZE-1; |
314 | ||
8550eb99 IM |
315 | if (is_kernel_text(addr) || |
316 | is_kernel_text(addr2)) | |
f3f20de8 JF |
317 | prot = PAGE_KERNEL_LARGE_EXEC; |
318 | ||
ce0c0e50 | 319 | pages_2m++; |
a2699e47 SS |
320 | if (mapping_iter == 1) |
321 | set_pmd(pmd, pfn_pmd(pfn, init_prot)); | |
322 | else | |
323 | set_pmd(pmd, pfn_pmd(pfn, prot)); | |
b239fb25 | 324 | |
1da177e4 | 325 | pfn += PTRS_PER_PTE; |
8550eb99 IM |
326 | continue; |
327 | } | |
328 | pte = one_page_table_init(pmd); | |
1da177e4 | 329 | |
a04ad82d YL |
330 | pte_ofs = pte_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET); |
331 | pte += pte_ofs; | |
332 | for (; pte_ofs < PTRS_PER_PTE && pfn < end_pfn; | |
8550eb99 IM |
333 | pte++, pfn++, pte_ofs++, addr += PAGE_SIZE) { |
334 | pgprot_t prot = PAGE_KERNEL; | |
a2699e47 SS |
335 | /* |
336 | * first pass will use the same initial | |
337 | * identity mapping attribute. | |
338 | */ | |
339 | pgprot_t init_prot = __pgprot(PTE_IDENT_ATTR); | |
f3f20de8 | 340 | |
8550eb99 IM |
341 | if (is_kernel_text(addr)) |
342 | prot = PAGE_KERNEL_EXEC; | |
f3f20de8 | 343 | |
ce0c0e50 | 344 | pages_4k++; |
c1fd1b43 | 345 | if (mapping_iter == 1) { |
a2699e47 | 346 | set_pte(pte, pfn_pte(pfn, init_prot)); |
c1fd1b43 PE |
347 | last_map_addr = (pfn << PAGE_SHIFT) + PAGE_SIZE; |
348 | } else | |
a2699e47 | 349 | set_pte(pte, pfn_pte(pfn, prot)); |
1da177e4 LT |
350 | } |
351 | } | |
352 | } | |
a2699e47 SS |
353 | if (mapping_iter == 1) { |
354 | /* | |
355 | * update direct mapping page count only in the first | |
356 | * iteration. | |
357 | */ | |
358 | update_page_count(PG_LEVEL_2M, pages_2m); | |
359 | update_page_count(PG_LEVEL_4K, pages_4k); | |
360 | ||
361 | /* | |
362 | * local global flush tlb, which will flush the previous | |
363 | * mappings present in both small and large page TLB's. | |
364 | */ | |
365 | __flush_tlb_all(); | |
366 | ||
367 | /* | |
368 | * Second iteration will set the actual desired PTE attributes. | |
369 | */ | |
370 | mapping_iter = 2; | |
371 | goto repeat; | |
372 | } | |
c1fd1b43 | 373 | return last_map_addr; |
ae531c26 AV |
374 | } |
375 | ||
1da177e4 LT |
376 | pte_t *kmap_pte; |
377 | pgprot_t kmap_prot; | |
378 | ||
8550eb99 IM |
379 | static inline pte_t *kmap_get_fixmap_pte(unsigned long vaddr) |
380 | { | |
381 | return pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), | |
382 | vaddr), vaddr), vaddr); | |
383 | } | |
1da177e4 LT |
384 | |
385 | static void __init kmap_init(void) | |
386 | { | |
387 | unsigned long kmap_vstart; | |
388 | ||
8550eb99 IM |
389 | /* |
390 | * Cache the first kmap pte: | |
391 | */ | |
1da177e4 LT |
392 | kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN); |
393 | kmap_pte = kmap_get_fixmap_pte(kmap_vstart); | |
394 | ||
395 | kmap_prot = PAGE_KERNEL; | |
396 | } | |
397 | ||
fd940934 | 398 | #ifdef CONFIG_HIGHMEM |
1da177e4 LT |
399 | static void __init permanent_kmaps_init(pgd_t *pgd_base) |
400 | { | |
8550eb99 | 401 | unsigned long vaddr; |
1da177e4 LT |
402 | pgd_t *pgd; |
403 | pud_t *pud; | |
404 | pmd_t *pmd; | |
405 | pte_t *pte; | |
1da177e4 LT |
406 | |
407 | vaddr = PKMAP_BASE; | |
408 | page_table_range_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base); | |
409 | ||
410 | pgd = swapper_pg_dir + pgd_index(vaddr); | |
411 | pud = pud_offset(pgd, vaddr); | |
412 | pmd = pmd_offset(pud, vaddr); | |
413 | pte = pte_offset_kernel(pmd, vaddr); | |
8550eb99 | 414 | pkmap_page_table = pte; |
1da177e4 LT |
415 | } |
416 | ||
b1258ac2 | 417 | static void __init add_one_highpage_init(struct page *page) |
1da177e4 | 418 | { |
cc9f7a0c YL |
419 | ClearPageReserved(page); |
420 | init_page_count(page); | |
421 | __free_page(page); | |
422 | totalhigh_pages++; | |
1da177e4 LT |
423 | } |
424 | ||
b5bc6c0e YL |
425 | struct add_highpages_data { |
426 | unsigned long start_pfn; | |
427 | unsigned long end_pfn; | |
b5bc6c0e YL |
428 | }; |
429 | ||
d52d53b8 | 430 | static int __init add_highpages_work_fn(unsigned long start_pfn, |
b5bc6c0e | 431 | unsigned long end_pfn, void *datax) |
1da177e4 | 432 | { |
b5bc6c0e YL |
433 | int node_pfn; |
434 | struct page *page; | |
435 | unsigned long final_start_pfn, final_end_pfn; | |
436 | struct add_highpages_data *data; | |
8550eb99 | 437 | |
b5bc6c0e | 438 | data = (struct add_highpages_data *)datax; |
b5bc6c0e YL |
439 | |
440 | final_start_pfn = max(start_pfn, data->start_pfn); | |
441 | final_end_pfn = min(end_pfn, data->end_pfn); | |
442 | if (final_start_pfn >= final_end_pfn) | |
d52d53b8 | 443 | return 0; |
b5bc6c0e YL |
444 | |
445 | for (node_pfn = final_start_pfn; node_pfn < final_end_pfn; | |
446 | node_pfn++) { | |
447 | if (!pfn_valid(node_pfn)) | |
448 | continue; | |
449 | page = pfn_to_page(node_pfn); | |
b1258ac2 | 450 | add_one_highpage_init(page); |
23be8c7d | 451 | } |
b5bc6c0e | 452 | |
d52d53b8 YL |
453 | return 0; |
454 | ||
b5bc6c0e YL |
455 | } |
456 | ||
457 | void __init add_highpages_with_active_regions(int nid, unsigned long start_pfn, | |
cc9f7a0c | 458 | unsigned long end_pfn) |
b5bc6c0e YL |
459 | { |
460 | struct add_highpages_data data; | |
461 | ||
462 | data.start_pfn = start_pfn; | |
463 | data.end_pfn = end_pfn; | |
b5bc6c0e YL |
464 | |
465 | work_with_active_regions(nid, add_highpages_work_fn, &data); | |
466 | } | |
467 | ||
1da177e4 | 468 | #else |
e8e32326 IB |
469 | static inline void permanent_kmaps_init(pgd_t *pgd_base) |
470 | { | |
471 | } | |
1da177e4 LT |
472 | #endif /* CONFIG_HIGHMEM */ |
473 | ||
b239fb25 | 474 | void __init native_pagetable_setup_start(pgd_t *base) |
1da177e4 | 475 | { |
551889a6 IC |
476 | unsigned long pfn, va; |
477 | pgd_t *pgd; | |
478 | pud_t *pud; | |
479 | pmd_t *pmd; | |
480 | pte_t *pte; | |
b239fb25 JF |
481 | |
482 | /* | |
551889a6 IC |
483 | * Remove any mappings which extend past the end of physical |
484 | * memory from the boot time page table: | |
b239fb25 | 485 | */ |
551889a6 IC |
486 | for (pfn = max_low_pfn + 1; pfn < 1<<(32-PAGE_SHIFT); pfn++) { |
487 | va = PAGE_OFFSET + (pfn<<PAGE_SHIFT); | |
488 | pgd = base + pgd_index(va); | |
489 | if (!pgd_present(*pgd)) | |
490 | break; | |
491 | ||
492 | pud = pud_offset(pgd, va); | |
493 | pmd = pmd_offset(pud, va); | |
494 | if (!pmd_present(*pmd)) | |
495 | break; | |
496 | ||
497 | pte = pte_offset_kernel(pmd, va); | |
498 | if (!pte_present(*pte)) | |
499 | break; | |
500 | ||
501 | pte_clear(NULL, va, pte); | |
502 | } | |
6944a9c8 | 503 | paravirt_alloc_pmd(&init_mm, __pa(base) >> PAGE_SHIFT); |
b239fb25 JF |
504 | } |
505 | ||
506 | void __init native_pagetable_setup_done(pgd_t *base) | |
507 | { | |
b239fb25 JF |
508 | } |
509 | ||
510 | /* | |
511 | * Build a proper pagetable for the kernel mappings. Up until this | |
512 | * point, we've been running on some set of pagetables constructed by | |
513 | * the boot process. | |
514 | * | |
515 | * If we're booting on native hardware, this will be a pagetable | |
551889a6 IC |
516 | * constructed in arch/x86/kernel/head_32.S. The root of the |
517 | * pagetable will be swapper_pg_dir. | |
b239fb25 JF |
518 | * |
519 | * If we're booting paravirtualized under a hypervisor, then there are | |
520 | * more options: we may already be running PAE, and the pagetable may | |
521 | * or may not be based in swapper_pg_dir. In any case, | |
522 | * paravirt_pagetable_setup_start() will set up swapper_pg_dir | |
523 | * appropriately for the rest of the initialization to work. | |
524 | * | |
525 | * In general, pagetable_init() assumes that the pagetable may already | |
526 | * be partially populated, and so it avoids stomping on any existing | |
527 | * mappings. | |
528 | */ | |
f765090a | 529 | void __init early_ioremap_page_table_range_init(void) |
b239fb25 | 530 | { |
e7179853 | 531 | pgd_t *pgd_base = swapper_pg_dir; |
8550eb99 | 532 | unsigned long vaddr, end; |
b239fb25 | 533 | |
1da177e4 LT |
534 | /* |
535 | * Fixed mappings, only the page table structure has to be | |
536 | * created - mappings will be set by set_fixmap(): | |
537 | */ | |
538 | vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK; | |
b239fb25 JF |
539 | end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK; |
540 | page_table_range_init(vaddr, end, pgd_base); | |
beacfaac | 541 | early_ioremap_reset(); |
e7b37895 YL |
542 | } |
543 | ||
544 | static void __init pagetable_init(void) | |
545 | { | |
546 | pgd_t *pgd_base = swapper_pg_dir; | |
547 | ||
1da177e4 | 548 | permanent_kmaps_init(pgd_base); |
1da177e4 LT |
549 | } |
550 | ||
a6eb84bc | 551 | #ifdef CONFIG_ACPI_SLEEP |
1da177e4 | 552 | /* |
a6eb84bc | 553 | * ACPI suspend needs this for resume, because things like the intel-agp |
1da177e4 LT |
554 | * driver might have split up a kernel 4MB mapping. |
555 | */ | |
a6eb84bc | 556 | char swsusp_pg_dir[PAGE_SIZE] |
8550eb99 | 557 | __attribute__ ((aligned(PAGE_SIZE))); |
1da177e4 LT |
558 | |
559 | static inline void save_pg_dir(void) | |
560 | { | |
561 | memcpy(swsusp_pg_dir, swapper_pg_dir, PAGE_SIZE); | |
562 | } | |
a6eb84bc | 563 | #else /* !CONFIG_ACPI_SLEEP */ |
1da177e4 LT |
564 | static inline void save_pg_dir(void) |
565 | { | |
566 | } | |
a6eb84bc | 567 | #endif /* !CONFIG_ACPI_SLEEP */ |
1da177e4 | 568 | |
55cd6367 | 569 | void zap_low_mappings(bool early) |
1da177e4 LT |
570 | { |
571 | int i; | |
572 | ||
1da177e4 LT |
573 | /* |
574 | * Zap initial low-memory mappings. | |
575 | * | |
576 | * Note that "pgd_clear()" doesn't do it for | |
577 | * us, because pgd_clear() is a no-op on i386. | |
578 | */ | |
68db065c | 579 | for (i = 0; i < KERNEL_PGD_BOUNDARY; i++) { |
1da177e4 LT |
580 | #ifdef CONFIG_X86_PAE |
581 | set_pgd(swapper_pg_dir+i, __pgd(1 + __pa(empty_zero_page))); | |
582 | #else | |
583 | set_pgd(swapper_pg_dir+i, __pgd(0)); | |
584 | #endif | |
8550eb99 | 585 | } |
55cd6367 YL |
586 | |
587 | if (early) | |
588 | __flush_tlb(); | |
589 | else | |
590 | flush_tlb_all(); | |
1da177e4 LT |
591 | } |
592 | ||
be43d728 | 593 | pteval_t __supported_pte_mask __read_mostly = ~(_PAGE_NX | _PAGE_GLOBAL | _PAGE_IOMAP); |
6fdc05d4 JF |
594 | EXPORT_SYMBOL_GPL(__supported_pte_mask); |
595 | ||
90d967e0 YL |
596 | /* user-defined highmem size */ |
597 | static unsigned int highmem_pages = -1; | |
598 | ||
599 | /* | |
600 | * highmem=size forces highmem to be exactly 'size' bytes. | |
601 | * This works even on boxes that have no highmem otherwise. | |
602 | * This also works to reduce highmem size on bigger boxes. | |
603 | */ | |
604 | static int __init parse_highmem(char *arg) | |
605 | { | |
606 | if (!arg) | |
607 | return -EINVAL; | |
608 | ||
609 | highmem_pages = memparse(arg, &arg) >> PAGE_SHIFT; | |
610 | return 0; | |
611 | } | |
612 | early_param("highmem", parse_highmem); | |
613 | ||
4769843b IM |
614 | #define MSG_HIGHMEM_TOO_BIG \ |
615 | "highmem size (%luMB) is bigger than pages available (%luMB)!\n" | |
616 | ||
617 | #define MSG_LOWMEM_TOO_SMALL \ | |
618 | "highmem size (%luMB) results in <64MB lowmem, ignoring it!\n" | |
90d967e0 | 619 | /* |
4769843b IM |
620 | * All of RAM fits into lowmem - but if user wants highmem |
621 | * artificially via the highmem=x boot parameter then create | |
622 | * it: | |
90d967e0 | 623 | */ |
4769843b | 624 | void __init lowmem_pfn_init(void) |
90d967e0 | 625 | { |
346cafec | 626 | /* max_low_pfn is 0, we already have early_res support */ |
90d967e0 | 627 | max_low_pfn = max_pfn; |
d88316c2 | 628 | |
4769843b IM |
629 | if (highmem_pages == -1) |
630 | highmem_pages = 0; | |
631 | #ifdef CONFIG_HIGHMEM | |
632 | if (highmem_pages >= max_pfn) { | |
633 | printk(KERN_ERR MSG_HIGHMEM_TOO_BIG, | |
634 | pages_to_mb(highmem_pages), pages_to_mb(max_pfn)); | |
635 | highmem_pages = 0; | |
636 | } | |
637 | if (highmem_pages) { | |
638 | if (max_low_pfn - highmem_pages < 64*1024*1024/PAGE_SIZE) { | |
639 | printk(KERN_ERR MSG_LOWMEM_TOO_SMALL, | |
90d967e0 YL |
640 | pages_to_mb(highmem_pages)); |
641 | highmem_pages = 0; | |
642 | } | |
4769843b IM |
643 | max_low_pfn -= highmem_pages; |
644 | } | |
645 | #else | |
646 | if (highmem_pages) | |
647 | printk(KERN_ERR "ignoring highmem size on non-highmem kernel!\n"); | |
648 | #endif | |
649 | } | |
650 | ||
651 | #define MSG_HIGHMEM_TOO_SMALL \ | |
652 | "only %luMB highmem pages available, ignoring highmem size of %luMB!\n" | |
653 | ||
654 | #define MSG_HIGHMEM_TRIMMED \ | |
655 | "Warning: only 4GB will be used. Use a HIGHMEM64G enabled kernel!\n" | |
656 | /* | |
657 | * We have more RAM than fits into lowmem - we try to put it into | |
658 | * highmem, also taking the highmem=x boot parameter into account: | |
659 | */ | |
660 | void __init highmem_pfn_init(void) | |
661 | { | |
d88316c2 IM |
662 | max_low_pfn = MAXMEM_PFN; |
663 | ||
4769843b IM |
664 | if (highmem_pages == -1) |
665 | highmem_pages = max_pfn - MAXMEM_PFN; | |
666 | ||
667 | if (highmem_pages + MAXMEM_PFN < max_pfn) | |
668 | max_pfn = MAXMEM_PFN + highmem_pages; | |
669 | ||
670 | if (highmem_pages + MAXMEM_PFN > max_pfn) { | |
671 | printk(KERN_WARNING MSG_HIGHMEM_TOO_SMALL, | |
672 | pages_to_mb(max_pfn - MAXMEM_PFN), | |
673 | pages_to_mb(highmem_pages)); | |
674 | highmem_pages = 0; | |
675 | } | |
90d967e0 | 676 | #ifndef CONFIG_HIGHMEM |
4769843b IM |
677 | /* Maximum memory usable is what is directly addressable */ |
678 | printk(KERN_WARNING "Warning only %ldMB will be used.\n", MAXMEM>>20); | |
679 | if (max_pfn > MAX_NONPAE_PFN) | |
680 | printk(KERN_WARNING "Use a HIGHMEM64G enabled kernel.\n"); | |
681 | else | |
682 | printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n"); | |
683 | max_pfn = MAXMEM_PFN; | |
90d967e0 YL |
684 | #else /* !CONFIG_HIGHMEM */ |
685 | #ifndef CONFIG_HIGHMEM64G | |
4769843b IM |
686 | if (max_pfn > MAX_NONPAE_PFN) { |
687 | max_pfn = MAX_NONPAE_PFN; | |
688 | printk(KERN_WARNING MSG_HIGHMEM_TRIMMED); | |
689 | } | |
90d967e0 YL |
690 | #endif /* !CONFIG_HIGHMEM64G */ |
691 | #endif /* !CONFIG_HIGHMEM */ | |
4769843b IM |
692 | } |
693 | ||
694 | /* | |
695 | * Determine low and high memory ranges: | |
696 | */ | |
697 | void __init find_low_pfn_range(void) | |
698 | { | |
699 | /* it could update max_pfn */ | |
700 | ||
d88316c2 | 701 | if (max_pfn <= MAXMEM_PFN) |
4769843b | 702 | lowmem_pfn_init(); |
d88316c2 IM |
703 | else |
704 | highmem_pfn_init(); | |
90d967e0 YL |
705 | } |
706 | ||
b2ac82a0 | 707 | #ifndef CONFIG_NEED_MULTIPLE_NODES |
8ee2debc DR |
708 | void __init initmem_init(unsigned long start_pfn, unsigned long end_pfn, |
709 | int acpi, int k8) | |
b2ac82a0 | 710 | { |
b2ac82a0 YL |
711 | #ifdef CONFIG_HIGHMEM |
712 | highstart_pfn = highend_pfn = max_pfn; | |
713 | if (max_pfn > max_low_pfn) | |
714 | highstart_pfn = max_low_pfn; | |
cb95a13a | 715 | e820_register_active_regions(0, 0, highend_pfn); |
ed077b58 | 716 | sparse_memory_present_with_active_regions(0); |
b2ac82a0 YL |
717 | printk(KERN_NOTICE "%ldMB HIGHMEM available.\n", |
718 | pages_to_mb(highend_pfn - highstart_pfn)); | |
719 | num_physpages = highend_pfn; | |
720 | high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1; | |
721 | #else | |
cb95a13a | 722 | e820_register_active_regions(0, 0, max_low_pfn); |
ed077b58 | 723 | sparse_memory_present_with_active_regions(0); |
b2ac82a0 YL |
724 | num_physpages = max_low_pfn; |
725 | high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1; | |
726 | #endif | |
727 | #ifdef CONFIG_FLATMEM | |
728 | max_mapnr = num_physpages; | |
729 | #endif | |
dc16ecf7 JF |
730 | __vmalloc_start_set = true; |
731 | ||
b2ac82a0 YL |
732 | printk(KERN_NOTICE "%ldMB LOWMEM available.\n", |
733 | pages_to_mb(max_low_pfn)); | |
734 | ||
735 | setup_bootmem_allocator(); | |
b2ac82a0 | 736 | } |
cb95a13a | 737 | #endif /* !CONFIG_NEED_MULTIPLE_NODES */ |
b2ac82a0 | 738 | |
cb95a13a | 739 | static void __init zone_sizes_init(void) |
b2ac82a0 YL |
740 | { |
741 | unsigned long max_zone_pfns[MAX_NR_ZONES]; | |
742 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); | |
743 | max_zone_pfns[ZONE_DMA] = | |
744 | virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT; | |
745 | max_zone_pfns[ZONE_NORMAL] = max_low_pfn; | |
b2ac82a0 YL |
746 | #ifdef CONFIG_HIGHMEM |
747 | max_zone_pfns[ZONE_HIGHMEM] = highend_pfn; | |
b2ac82a0 YL |
748 | #endif |
749 | ||
750 | free_area_init_nodes(max_zone_pfns); | |
751 | } | |
b2ac82a0 | 752 | |
59be5a8e | 753 | #ifndef CONFIG_NO_BOOTMEM |
a71edd1f YL |
754 | static unsigned long __init setup_node_bootmem(int nodeid, |
755 | unsigned long start_pfn, | |
756 | unsigned long end_pfn, | |
757 | unsigned long bootmap) | |
758 | { | |
759 | unsigned long bootmap_size; | |
760 | ||
a71edd1f YL |
761 | /* don't touch min_low_pfn */ |
762 | bootmap_size = init_bootmem_node(NODE_DATA(nodeid), | |
763 | bootmap >> PAGE_SHIFT, | |
764 | start_pfn, end_pfn); | |
765 | printk(KERN_INFO " node %d low ram: %08lx - %08lx\n", | |
766 | nodeid, start_pfn<<PAGE_SHIFT, end_pfn<<PAGE_SHIFT); | |
767 | printk(KERN_INFO " node %d bootmap %08lx - %08lx\n", | |
768 | nodeid, bootmap, bootmap + bootmap_size); | |
769 | free_bootmem_with_active_regions(nodeid, end_pfn); | |
a71edd1f YL |
770 | |
771 | return bootmap + bootmap_size; | |
772 | } | |
59be5a8e | 773 | #endif |
a71edd1f | 774 | |
b2ac82a0 YL |
775 | void __init setup_bootmem_allocator(void) |
776 | { | |
59be5a8e | 777 | #ifndef CONFIG_NO_BOOTMEM |
a71edd1f | 778 | int nodeid; |
b2ac82a0 YL |
779 | unsigned long bootmap_size, bootmap; |
780 | /* | |
781 | * Initialize the boot-time allocator (with low memory only): | |
782 | */ | |
783 | bootmap_size = bootmem_bootmap_pages(max_low_pfn)<<PAGE_SHIFT; | |
fc5efe39 | 784 | bootmap = find_e820_area(0, max_pfn_mapped<<PAGE_SHIFT, bootmap_size, |
b2ac82a0 YL |
785 | PAGE_SIZE); |
786 | if (bootmap == -1L) | |
787 | panic("Cannot find bootmem map of size %ld\n", bootmap_size); | |
788 | reserve_early(bootmap, bootmap + bootmap_size, "BOOTMAP"); | |
59be5a8e | 789 | #endif |
225c37d7 | 790 | |
b2ac82a0 YL |
791 | printk(KERN_INFO " mapped low ram: 0 - %08lx\n", |
792 | max_pfn_mapped<<PAGE_SHIFT); | |
fc5efe39 | 793 | printk(KERN_INFO " low ram: 0 - %08lx\n", max_low_pfn<<PAGE_SHIFT); |
7482b0e9 | 794 | |
59be5a8e | 795 | #ifndef CONFIG_NO_BOOTMEM |
e954ef20 YL |
796 | for_each_online_node(nodeid) { |
797 | unsigned long start_pfn, end_pfn; | |
798 | ||
a71edd1f | 799 | #ifdef CONFIG_NEED_MULTIPLE_NODES |
e954ef20 YL |
800 | start_pfn = node_start_pfn[nodeid]; |
801 | end_pfn = node_end_pfn[nodeid]; | |
802 | if (start_pfn > max_low_pfn) | |
803 | continue; | |
804 | if (end_pfn > max_low_pfn) | |
805 | end_pfn = max_low_pfn; | |
0b8fdcbc | 806 | #else |
e954ef20 YL |
807 | start_pfn = 0; |
808 | end_pfn = max_low_pfn; | |
4e29684c | 809 | #endif |
e954ef20 YL |
810 | bootmap = setup_node_bootmem(nodeid, start_pfn, end_pfn, |
811 | bootmap); | |
812 | } | |
59be5a8e | 813 | #endif |
4e29684c | 814 | |
c464573c | 815 | after_bootmem = 1; |
4e29684c YL |
816 | } |
817 | ||
1da177e4 LT |
818 | /* |
819 | * paging_init() sets up the page tables - note that the first 8MB are | |
820 | * already mapped by head.S. | |
821 | * | |
822 | * This routines also unmaps the page at virtual kernel address 0, so | |
823 | * that we can trap those pesky NULL-reference errors in the kernel. | |
824 | */ | |
825 | void __init paging_init(void) | |
826 | { | |
1da177e4 LT |
827 | pagetable_init(); |
828 | ||
1da177e4 LT |
829 | __flush_tlb_all(); |
830 | ||
831 | kmap_init(); | |
11cd0bc1 YL |
832 | |
833 | /* | |
834 | * NOTE: at this point the bootmem allocator is fully available. | |
835 | */ | |
11cd0bc1 YL |
836 | sparse_init(); |
837 | zone_sizes_init(); | |
1da177e4 LT |
838 | } |
839 | ||
840 | /* | |
841 | * Test if the WP bit works in supervisor mode. It isn't supported on 386's | |
f7f17a67 DV |
842 | * and also on some strange 486's. All 586+'s are OK. This used to involve |
843 | * black magic jumps to work around some nasty CPU bugs, but fortunately the | |
844 | * switch to using exceptions got rid of all that. | |
1da177e4 | 845 | */ |
1da177e4 LT |
846 | static void __init test_wp_bit(void) |
847 | { | |
d7d119d7 IM |
848 | printk(KERN_INFO |
849 | "Checking if this processor honours the WP bit even in supervisor mode..."); | |
1da177e4 LT |
850 | |
851 | /* Any page-aligned address will do, the test is non-destructive */ | |
852 | __set_fixmap(FIX_WP_TEST, __pa(&swapper_pg_dir), PAGE_READONLY); | |
853 | boot_cpu_data.wp_works_ok = do_test_wp_bit(); | |
854 | clear_fixmap(FIX_WP_TEST); | |
855 | ||
856 | if (!boot_cpu_data.wp_works_ok) { | |
d7d119d7 | 857 | printk(KERN_CONT "No.\n"); |
1da177e4 | 858 | #ifdef CONFIG_X86_WP_WORKS_OK |
d7d119d7 IM |
859 | panic( |
860 | "This kernel doesn't support CPU's with broken WP. Recompile it for a 386!"); | |
1da177e4 LT |
861 | #endif |
862 | } else { | |
d7d119d7 | 863 | printk(KERN_CONT "Ok.\n"); |
1da177e4 LT |
864 | } |
865 | } | |
866 | ||
1da177e4 LT |
867 | void __init mem_init(void) |
868 | { | |
1da177e4 | 869 | int codesize, reservedpages, datasize, initsize; |
cc9f7a0c | 870 | int tmp; |
1da177e4 | 871 | |
cfb80c9e JF |
872 | pci_iommu_alloc(); |
873 | ||
05b79bdc | 874 | #ifdef CONFIG_FLATMEM |
8d8f3cbe | 875 | BUG_ON(!mem_map); |
1da177e4 | 876 | #endif |
1da177e4 LT |
877 | /* this will put all low memory onto the freelists */ |
878 | totalram_pages += free_all_bootmem(); | |
879 | ||
880 | reservedpages = 0; | |
881 | for (tmp = 0; tmp < max_low_pfn; tmp++) | |
882 | /* | |
8550eb99 | 883 | * Only count reserved RAM pages: |
1da177e4 LT |
884 | */ |
885 | if (page_is_ram(tmp) && PageReserved(pfn_to_page(tmp))) | |
886 | reservedpages++; | |
887 | ||
cc9f7a0c | 888 | set_highmem_pages_init(); |
1da177e4 LT |
889 | |
890 | codesize = (unsigned long) &_etext - (unsigned long) &_text; | |
891 | datasize = (unsigned long) &_edata - (unsigned long) &_etext; | |
892 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; | |
893 | ||
8550eb99 IM |
894 | printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, " |
895 | "%dk reserved, %dk data, %dk init, %ldk highmem)\n", | |
cc013a88 | 896 | nr_free_pages() << (PAGE_SHIFT-10), |
1da177e4 LT |
897 | num_physpages << (PAGE_SHIFT-10), |
898 | codesize >> 10, | |
899 | reservedpages << (PAGE_SHIFT-10), | |
900 | datasize >> 10, | |
901 | initsize >> 10, | |
4b529401 | 902 | totalhigh_pages << (PAGE_SHIFT-10)); |
1da177e4 | 903 | |
d7d119d7 | 904 | printk(KERN_INFO "virtual kernel memory layout:\n" |
8550eb99 | 905 | " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" |
052e7994 | 906 | #ifdef CONFIG_HIGHMEM |
8550eb99 | 907 | " pkmap : 0x%08lx - 0x%08lx (%4ld kB)\n" |
052e7994 | 908 | #endif |
8550eb99 IM |
909 | " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" |
910 | " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
911 | " .init : 0x%08lx - 0x%08lx (%4ld kB)\n" | |
912 | " .data : 0x%08lx - 0x%08lx (%4ld kB)\n" | |
913 | " .text : 0x%08lx - 0x%08lx (%4ld kB)\n", | |
914 | FIXADDR_START, FIXADDR_TOP, | |
915 | (FIXADDR_TOP - FIXADDR_START) >> 10, | |
052e7994 JF |
916 | |
917 | #ifdef CONFIG_HIGHMEM | |
8550eb99 IM |
918 | PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE, |
919 | (LAST_PKMAP*PAGE_SIZE) >> 10, | |
052e7994 JF |
920 | #endif |
921 | ||
8550eb99 IM |
922 | VMALLOC_START, VMALLOC_END, |
923 | (VMALLOC_END - VMALLOC_START) >> 20, | |
052e7994 | 924 | |
8550eb99 IM |
925 | (unsigned long)__va(0), (unsigned long)high_memory, |
926 | ((unsigned long)high_memory - (unsigned long)__va(0)) >> 20, | |
052e7994 | 927 | |
8550eb99 IM |
928 | (unsigned long)&__init_begin, (unsigned long)&__init_end, |
929 | ((unsigned long)&__init_end - | |
930 | (unsigned long)&__init_begin) >> 10, | |
052e7994 | 931 | |
8550eb99 IM |
932 | (unsigned long)&_etext, (unsigned long)&_edata, |
933 | ((unsigned long)&_edata - (unsigned long)&_etext) >> 10, | |
052e7994 | 934 | |
8550eb99 IM |
935 | (unsigned long)&_text, (unsigned long)&_etext, |
936 | ((unsigned long)&_etext - (unsigned long)&_text) >> 10); | |
052e7994 | 937 | |
beeb4195 JB |
938 | /* |
939 | * Check boundaries twice: Some fundamental inconsistencies can | |
940 | * be detected at build time already. | |
941 | */ | |
942 | #define __FIXADDR_TOP (-PAGE_SIZE) | |
943 | #ifdef CONFIG_HIGHMEM | |
944 | BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP*PAGE_SIZE > FIXADDR_START); | |
945 | BUILD_BUG_ON(VMALLOC_END > PKMAP_BASE); | |
946 | #endif | |
947 | #define high_memory (-128UL << 20) | |
948 | BUILD_BUG_ON(VMALLOC_START >= VMALLOC_END); | |
949 | #undef high_memory | |
950 | #undef __FIXADDR_TOP | |
951 | ||
052e7994 | 952 | #ifdef CONFIG_HIGHMEM |
8550eb99 IM |
953 | BUG_ON(PKMAP_BASE + LAST_PKMAP*PAGE_SIZE > FIXADDR_START); |
954 | BUG_ON(VMALLOC_END > PKMAP_BASE); | |
052e7994 | 955 | #endif |
beeb4195 | 956 | BUG_ON(VMALLOC_START >= VMALLOC_END); |
8550eb99 | 957 | BUG_ON((unsigned long)high_memory > VMALLOC_START); |
052e7994 | 958 | |
1da177e4 LT |
959 | if (boot_cpu_data.wp_works_ok < 0) |
960 | test_wp_bit(); | |
961 | ||
61165d7a | 962 | save_pg_dir(); |
55cd6367 | 963 | zap_low_mappings(true); |
1da177e4 LT |
964 | } |
965 | ||
ad8f5797 | 966 | #ifdef CONFIG_MEMORY_HOTPLUG |
bc02af93 | 967 | int arch_add_memory(int nid, u64 start, u64 size) |
05039b92 | 968 | { |
7c7e9425 | 969 | struct pglist_data *pgdata = NODE_DATA(nid); |
776ed98b | 970 | struct zone *zone = pgdata->node_zones + ZONE_HIGHMEM; |
05039b92 DH |
971 | unsigned long start_pfn = start >> PAGE_SHIFT; |
972 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
973 | ||
c04fc586 | 974 | return __add_pages(nid, zone, start_pfn, nr_pages); |
05039b92 | 975 | } |
9d99aaa3 | 976 | #endif |
05039b92 | 977 | |
1da177e4 LT |
978 | /* |
979 | * This function cannot be __init, since exceptions don't work in that | |
980 | * section. Put this after the callers, so that it cannot be inlined. | |
981 | */ | |
8550eb99 | 982 | static noinline int do_test_wp_bit(void) |
1da177e4 LT |
983 | { |
984 | char tmp_reg; | |
985 | int flag; | |
986 | ||
987 | __asm__ __volatile__( | |
8550eb99 IM |
988 | " movb %0, %1 \n" |
989 | "1: movb %1, %0 \n" | |
990 | " xorl %2, %2 \n" | |
1da177e4 | 991 | "2: \n" |
f832ff18 | 992 | _ASM_EXTABLE(1b,2b) |
1da177e4 LT |
993 | :"=m" (*(char *)fix_to_virt(FIX_WP_TEST)), |
994 | "=q" (tmp_reg), | |
995 | "=r" (flag) | |
996 | :"2" (1) | |
997 | :"memory"); | |
8550eb99 | 998 | |
1da177e4 LT |
999 | return flag; |
1000 | } | |
1001 | ||
63aaf308 | 1002 | #ifdef CONFIG_DEBUG_RODATA |
edeed305 AV |
1003 | const int rodata_test_data = 0xC3; |
1004 | EXPORT_SYMBOL_GPL(rodata_test_data); | |
63aaf308 | 1005 | |
502f6604 | 1006 | int kernel_set_to_readonly __read_mostly; |
16239630 SR |
1007 | |
1008 | void set_kernel_text_rw(void) | |
1009 | { | |
1010 | unsigned long start = PFN_ALIGN(_text); | |
1011 | unsigned long size = PFN_ALIGN(_etext) - start; | |
1012 | ||
1013 | if (!kernel_set_to_readonly) | |
1014 | return; | |
1015 | ||
1016 | pr_debug("Set kernel text: %lx - %lx for read write\n", | |
1017 | start, start+size); | |
1018 | ||
1019 | set_pages_rw(virt_to_page(start), size >> PAGE_SHIFT); | |
1020 | } | |
1021 | ||
1022 | void set_kernel_text_ro(void) | |
1023 | { | |
1024 | unsigned long start = PFN_ALIGN(_text); | |
1025 | unsigned long size = PFN_ALIGN(_etext) - start; | |
1026 | ||
1027 | if (!kernel_set_to_readonly) | |
1028 | return; | |
1029 | ||
1030 | pr_debug("Set kernel text: %lx - %lx for read only\n", | |
1031 | start, start+size); | |
1032 | ||
1033 | set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT); | |
1034 | } | |
1035 | ||
63aaf308 AV |
1036 | void mark_rodata_ro(void) |
1037 | { | |
6fb14755 JB |
1038 | unsigned long start = PFN_ALIGN(_text); |
1039 | unsigned long size = PFN_ALIGN(_etext) - start; | |
63aaf308 | 1040 | |
4e4eee0e MD |
1041 | set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT); |
1042 | printk(KERN_INFO "Write protecting the kernel text: %luk\n", | |
1043 | size >> 10); | |
0c42f392 | 1044 | |
16239630 SR |
1045 | kernel_set_to_readonly = 1; |
1046 | ||
0c42f392 | 1047 | #ifdef CONFIG_CPA_DEBUG |
4e4eee0e MD |
1048 | printk(KERN_INFO "Testing CPA: Reverting %lx-%lx\n", |
1049 | start, start+size); | |
1050 | set_pages_rw(virt_to_page(start), size>>PAGE_SHIFT); | |
0c42f392 | 1051 | |
4e4eee0e MD |
1052 | printk(KERN_INFO "Testing CPA: write protecting again\n"); |
1053 | set_pages_ro(virt_to_page(start), size>>PAGE_SHIFT); | |
602033ed | 1054 | #endif |
8f0f996e | 1055 | |
6fb14755 JB |
1056 | start += size; |
1057 | size = (unsigned long)__end_rodata - start; | |
6d238cc4 | 1058 | set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT); |
d7d119d7 IM |
1059 | printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n", |
1060 | size >> 10); | |
edeed305 | 1061 | rodata_test(); |
63aaf308 | 1062 | |
0c42f392 | 1063 | #ifdef CONFIG_CPA_DEBUG |
d7d119d7 | 1064 | printk(KERN_INFO "Testing CPA: undo %lx-%lx\n", start, start + size); |
6d238cc4 | 1065 | set_pages_rw(virt_to_page(start), size >> PAGE_SHIFT); |
0c42f392 | 1066 | |
d7d119d7 | 1067 | printk(KERN_INFO "Testing CPA: write protecting again\n"); |
6d238cc4 | 1068 | set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT); |
0c42f392 | 1069 | #endif |
63aaf308 AV |
1070 | } |
1071 | #endif | |
1072 | ||
d2dbf343 YL |
1073 | int __init reserve_bootmem_generic(unsigned long phys, unsigned long len, |
1074 | int flags) | |
1075 | { | |
1076 | return reserve_bootmem(phys, len, flags); | |
1077 | } |