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> | |
6fb14755 | 24 | #include <linux/pfn.h> |
c9cf5528 | 25 | #include <linux/poison.h> |
1da177e4 LT |
26 | #include <linux/bootmem.h> |
27 | #include <linux/slab.h> | |
28 | #include <linux/proc_fs.h> | |
05039b92 | 29 | #include <linux/memory_hotplug.h> |
27d99f7e | 30 | #include <linux/initrd.h> |
55b2355e | 31 | #include <linux/cpumask.h> |
1da177e4 | 32 | |
f832ff18 | 33 | #include <asm/asm.h> |
1da177e4 LT |
34 | #include <asm/processor.h> |
35 | #include <asm/system.h> | |
36 | #include <asm/uaccess.h> | |
37 | #include <asm/pgtable.h> | |
38 | #include <asm/dma.h> | |
39 | #include <asm/fixmap.h> | |
40 | #include <asm/e820.h> | |
41 | #include <asm/apic.h> | |
8550eb99 | 42 | #include <asm/bugs.h> |
1da177e4 LT |
43 | #include <asm/tlb.h> |
44 | #include <asm/tlbflush.h> | |
a5a19c63 | 45 | #include <asm/pgalloc.h> |
1da177e4 | 46 | #include <asm/sections.h> |
b239fb25 | 47 | #include <asm/paravirt.h> |
551889a6 | 48 | #include <asm/setup.h> |
7bfeab9a | 49 | #include <asm/cacheflush.h> |
1da177e4 LT |
50 | |
51 | unsigned int __VMALLOC_RESERVE = 128 << 20; | |
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 YL |
61 | |
62 | static unsigned long __initdata table_start; | |
63 | static unsigned long __meminitdata table_end; | |
64 | static unsigned long __meminitdata table_top; | |
65 | ||
66 | static int __initdata after_init_bootmem; | |
67 | ||
68 | static __init void *alloc_low_page(unsigned long *phys) | |
69 | { | |
70 | unsigned long pfn = table_end++; | |
71 | void *adr; | |
72 | ||
73 | if (pfn >= table_top) | |
74 | panic("alloc_low_page: ran out of memory"); | |
75 | ||
76 | adr = __va(pfn * PAGE_SIZE); | |
77 | memset(adr, 0, PAGE_SIZE); | |
78 | *phys = pfn * PAGE_SIZE; | |
79 | return adr; | |
80 | } | |
81 | ||
1da177e4 LT |
82 | /* |
83 | * Creates a middle page table and puts a pointer to it in the | |
84 | * given global directory entry. This only returns the gd entry | |
85 | * in non-PAE compilation mode, since the middle layer is folded. | |
86 | */ | |
87 | static pmd_t * __init one_md_table_init(pgd_t *pgd) | |
88 | { | |
89 | pud_t *pud; | |
90 | pmd_t *pmd_table; | |
8550eb99 | 91 | |
1da177e4 | 92 | #ifdef CONFIG_X86_PAE |
4e29684c | 93 | unsigned long phys; |
b239fb25 | 94 | if (!(pgd_val(*pgd) & _PAGE_PRESENT)) { |
4e29684c YL |
95 | if (after_init_bootmem) |
96 | pmd_table = (pmd_t *)alloc_bootmem_low_pages(PAGE_SIZE); | |
97 | else | |
98 | pmd_table = (pmd_t *)alloc_low_page(&phys); | |
6944a9c8 | 99 | paravirt_alloc_pmd(&init_mm, __pa(pmd_table) >> PAGE_SHIFT); |
b239fb25 JF |
100 | set_pgd(pgd, __pgd(__pa(pmd_table) | _PAGE_PRESENT)); |
101 | pud = pud_offset(pgd, 0); | |
8550eb99 | 102 | BUG_ON(pmd_table != pmd_offset(pud, 0)); |
b239fb25 JF |
103 | } |
104 | #endif | |
1da177e4 LT |
105 | pud = pud_offset(pgd, 0); |
106 | pmd_table = pmd_offset(pud, 0); | |
8550eb99 | 107 | |
1da177e4 LT |
108 | return pmd_table; |
109 | } | |
110 | ||
111 | /* | |
112 | * Create a page table and place a pointer to it in a middle page | |
8550eb99 | 113 | * directory entry: |
1da177e4 LT |
114 | */ |
115 | static pte_t * __init one_page_table_init(pmd_t *pmd) | |
116 | { | |
b239fb25 | 117 | if (!(pmd_val(*pmd) & _PAGE_PRESENT)) { |
509a80c4 IM |
118 | pte_t *page_table = NULL; |
119 | ||
4e29684c | 120 | if (after_init_bootmem) { |
509a80c4 | 121 | #ifdef CONFIG_DEBUG_PAGEALLOC |
4e29684c | 122 | page_table = (pte_t *) alloc_bootmem_pages(PAGE_SIZE); |
509a80c4 | 123 | #endif |
4e29684c YL |
124 | if (!page_table) |
125 | page_table = | |
509a80c4 | 126 | (pte_t *)alloc_bootmem_low_pages(PAGE_SIZE); |
4e29684c YL |
127 | } else { |
128 | unsigned long phys; | |
129 | page_table = (pte_t *)alloc_low_page(&phys); | |
8550eb99 | 130 | } |
b239fb25 | 131 | |
6944a9c8 | 132 | paravirt_alloc_pte(&init_mm, __pa(page_table) >> PAGE_SHIFT); |
1da177e4 | 133 | set_pmd(pmd, __pmd(__pa(page_table) | _PAGE_TABLE)); |
b239fb25 | 134 | BUG_ON(page_table != pte_offset_kernel(pmd, 0)); |
1da177e4 | 135 | } |
509a80c4 | 136 | |
1da177e4 LT |
137 | return pte_offset_kernel(pmd, 0); |
138 | } | |
139 | ||
140 | /* | |
8550eb99 | 141 | * This function initializes a certain range of kernel virtual memory |
1da177e4 LT |
142 | * with new bootmem page tables, everywhere page tables are missing in |
143 | * the given range. | |
8550eb99 IM |
144 | * |
145 | * NOTE: The pagetables are allocated contiguous on the physical space | |
146 | * so we can cache the place of the first one and move around without | |
1da177e4 LT |
147 | * checking the pgd every time. |
148 | */ | |
8550eb99 IM |
149 | static void __init |
150 | page_table_range_init(unsigned long start, unsigned long end, pgd_t *pgd_base) | |
1da177e4 | 151 | { |
1da177e4 LT |
152 | int pgd_idx, pmd_idx; |
153 | unsigned long vaddr; | |
8550eb99 IM |
154 | pgd_t *pgd; |
155 | pmd_t *pmd; | |
1da177e4 LT |
156 | |
157 | vaddr = start; | |
158 | pgd_idx = pgd_index(vaddr); | |
159 | pmd_idx = pmd_index(vaddr); | |
160 | pgd = pgd_base + pgd_idx; | |
161 | ||
162 | for ( ; (pgd_idx < PTRS_PER_PGD) && (vaddr != end); pgd++, pgd_idx++) { | |
b239fb25 JF |
163 | pmd = one_md_table_init(pgd); |
164 | pmd = pmd + pmd_index(vaddr); | |
8550eb99 IM |
165 | for (; (pmd_idx < PTRS_PER_PMD) && (vaddr != end); |
166 | pmd++, pmd_idx++) { | |
b239fb25 | 167 | one_page_table_init(pmd); |
1da177e4 LT |
168 | |
169 | vaddr += PMD_SIZE; | |
170 | } | |
171 | pmd_idx = 0; | |
172 | } | |
173 | } | |
174 | ||
175 | static inline int is_kernel_text(unsigned long addr) | |
176 | { | |
177 | if (addr >= PAGE_OFFSET && addr <= (unsigned long)__init_end) | |
178 | return 1; | |
179 | return 0; | |
180 | } | |
181 | ||
182 | /* | |
8550eb99 IM |
183 | * This maps the physical memory to kernel virtual address space, a total |
184 | * of max_low_pfn pages, by creating page tables starting from address | |
185 | * PAGE_OFFSET: | |
1da177e4 | 186 | */ |
4e29684c | 187 | static void __init kernel_physical_mapping_init(pgd_t *pgd_base, |
a04ad82d YL |
188 | unsigned long start_pfn, |
189 | unsigned long end_pfn, | |
190 | int use_pse) | |
1da177e4 | 191 | { |
8550eb99 | 192 | int pgd_idx, pmd_idx, pte_ofs; |
1da177e4 LT |
193 | unsigned long pfn; |
194 | pgd_t *pgd; | |
195 | pmd_t *pmd; | |
196 | pte_t *pte; | |
ce0c0e50 | 197 | unsigned pages_2m = 0, pages_4k = 0; |
1da177e4 | 198 | |
a04ad82d YL |
199 | if (!cpu_has_pse) |
200 | use_pse = 0; | |
1da177e4 | 201 | |
a04ad82d YL |
202 | pfn = start_pfn; |
203 | pgd_idx = pgd_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET); | |
204 | pgd = pgd_base + pgd_idx; | |
1da177e4 LT |
205 | for (; pgd_idx < PTRS_PER_PGD; pgd++, pgd_idx++) { |
206 | pmd = one_md_table_init(pgd); | |
8550eb99 | 207 | |
a04ad82d YL |
208 | if (pfn >= end_pfn) |
209 | continue; | |
210 | #ifdef CONFIG_X86_PAE | |
211 | pmd_idx = pmd_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET); | |
212 | pmd += pmd_idx; | |
213 | #else | |
214 | pmd_idx = 0; | |
215 | #endif | |
216 | for (; pmd_idx < PTRS_PER_PMD && pfn < end_pfn; | |
f3f20de8 | 217 | pmd++, pmd_idx++) { |
8550eb99 | 218 | unsigned int addr = pfn * PAGE_SIZE + PAGE_OFFSET; |
1da177e4 | 219 | |
8550eb99 IM |
220 | /* |
221 | * Map with big pages if possible, otherwise | |
222 | * create normal page tables: | |
223 | */ | |
a04ad82d | 224 | if (use_pse) { |
8550eb99 | 225 | unsigned int addr2; |
f3f20de8 JF |
226 | pgprot_t prot = PAGE_KERNEL_LARGE; |
227 | ||
8550eb99 | 228 | addr2 = (pfn + PTRS_PER_PTE-1) * PAGE_SIZE + |
f3f20de8 JF |
229 | PAGE_OFFSET + PAGE_SIZE-1; |
230 | ||
8550eb99 IM |
231 | if (is_kernel_text(addr) || |
232 | is_kernel_text(addr2)) | |
f3f20de8 JF |
233 | prot = PAGE_KERNEL_LARGE_EXEC; |
234 | ||
ce0c0e50 | 235 | pages_2m++; |
f3f20de8 | 236 | set_pmd(pmd, pfn_pmd(pfn, prot)); |
b239fb25 | 237 | |
1da177e4 | 238 | pfn += PTRS_PER_PTE; |
8550eb99 IM |
239 | continue; |
240 | } | |
241 | pte = one_page_table_init(pmd); | |
1da177e4 | 242 | |
a04ad82d YL |
243 | pte_ofs = pte_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET); |
244 | pte += pte_ofs; | |
245 | for (; pte_ofs < PTRS_PER_PTE && pfn < end_pfn; | |
8550eb99 IM |
246 | pte++, pfn++, pte_ofs++, addr += PAGE_SIZE) { |
247 | pgprot_t prot = PAGE_KERNEL; | |
f3f20de8 | 248 | |
8550eb99 IM |
249 | if (is_kernel_text(addr)) |
250 | prot = PAGE_KERNEL_EXEC; | |
f3f20de8 | 251 | |
ce0c0e50 | 252 | pages_4k++; |
8550eb99 | 253 | set_pte(pte, pfn_pte(pfn, prot)); |
1da177e4 LT |
254 | } |
255 | } | |
256 | } | |
ce0c0e50 AK |
257 | update_page_count(PG_LEVEL_2M, pages_2m); |
258 | update_page_count(PG_LEVEL_4K, pages_4k); | |
1da177e4 LT |
259 | } |
260 | ||
ae531c26 AV |
261 | /* |
262 | * devmem_is_allowed() checks to see if /dev/mem access to a certain address | |
263 | * is valid. The argument is a physical page number. | |
264 | * | |
265 | * | |
266 | * On x86, access has to be given to the first megabyte of ram because that area | |
267 | * contains bios code and data regions used by X and dosemu and similar apps. | |
268 | * Access has to be given to non-kernel-ram areas as well, these contain the PCI | |
269 | * mmio resources as well as potential bios/acpi data regions. | |
270 | */ | |
271 | int devmem_is_allowed(unsigned long pagenr) | |
272 | { | |
273 | if (pagenr <= 256) | |
274 | return 1; | |
275 | if (!page_is_ram(pagenr)) | |
276 | return 1; | |
277 | return 0; | |
278 | } | |
279 | ||
1da177e4 LT |
280 | #ifdef CONFIG_HIGHMEM |
281 | pte_t *kmap_pte; | |
282 | pgprot_t kmap_prot; | |
283 | ||
8550eb99 IM |
284 | static inline pte_t *kmap_get_fixmap_pte(unsigned long vaddr) |
285 | { | |
286 | return pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), | |
287 | vaddr), vaddr), vaddr); | |
288 | } | |
1da177e4 LT |
289 | |
290 | static void __init kmap_init(void) | |
291 | { | |
292 | unsigned long kmap_vstart; | |
293 | ||
8550eb99 IM |
294 | /* |
295 | * Cache the first kmap pte: | |
296 | */ | |
1da177e4 LT |
297 | kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN); |
298 | kmap_pte = kmap_get_fixmap_pte(kmap_vstart); | |
299 | ||
300 | kmap_prot = PAGE_KERNEL; | |
301 | } | |
302 | ||
303 | static void __init permanent_kmaps_init(pgd_t *pgd_base) | |
304 | { | |
8550eb99 | 305 | unsigned long vaddr; |
1da177e4 LT |
306 | pgd_t *pgd; |
307 | pud_t *pud; | |
308 | pmd_t *pmd; | |
309 | pte_t *pte; | |
1da177e4 LT |
310 | |
311 | vaddr = PKMAP_BASE; | |
312 | page_table_range_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base); | |
313 | ||
314 | pgd = swapper_pg_dir + pgd_index(vaddr); | |
315 | pud = pud_offset(pgd, vaddr); | |
316 | pmd = pmd_offset(pud, vaddr); | |
317 | pte = pte_offset_kernel(pmd, vaddr); | |
8550eb99 | 318 | pkmap_page_table = pte; |
1da177e4 LT |
319 | } |
320 | ||
cc9f7a0c | 321 | static void __init add_one_highpage_init(struct page *page, int pfn) |
1da177e4 | 322 | { |
cc9f7a0c YL |
323 | ClearPageReserved(page); |
324 | init_page_count(page); | |
325 | __free_page(page); | |
326 | totalhigh_pages++; | |
1da177e4 LT |
327 | } |
328 | ||
b5bc6c0e YL |
329 | struct add_highpages_data { |
330 | unsigned long start_pfn; | |
331 | unsigned long end_pfn; | |
b5bc6c0e YL |
332 | }; |
333 | ||
d52d53b8 | 334 | static int __init add_highpages_work_fn(unsigned long start_pfn, |
b5bc6c0e | 335 | unsigned long end_pfn, void *datax) |
1da177e4 | 336 | { |
b5bc6c0e YL |
337 | int node_pfn; |
338 | struct page *page; | |
339 | unsigned long final_start_pfn, final_end_pfn; | |
340 | struct add_highpages_data *data; | |
8550eb99 | 341 | |
b5bc6c0e | 342 | data = (struct add_highpages_data *)datax; |
b5bc6c0e YL |
343 | |
344 | final_start_pfn = max(start_pfn, data->start_pfn); | |
345 | final_end_pfn = min(end_pfn, data->end_pfn); | |
346 | if (final_start_pfn >= final_end_pfn) | |
d52d53b8 | 347 | return 0; |
b5bc6c0e YL |
348 | |
349 | for (node_pfn = final_start_pfn; node_pfn < final_end_pfn; | |
350 | node_pfn++) { | |
351 | if (!pfn_valid(node_pfn)) | |
352 | continue; | |
353 | page = pfn_to_page(node_pfn); | |
cc9f7a0c | 354 | add_one_highpage_init(page, node_pfn); |
23be8c7d | 355 | } |
b5bc6c0e | 356 | |
d52d53b8 YL |
357 | return 0; |
358 | ||
b5bc6c0e YL |
359 | } |
360 | ||
361 | void __init add_highpages_with_active_regions(int nid, unsigned long start_pfn, | |
cc9f7a0c | 362 | unsigned long end_pfn) |
b5bc6c0e YL |
363 | { |
364 | struct add_highpages_data data; | |
365 | ||
366 | data.start_pfn = start_pfn; | |
367 | data.end_pfn = end_pfn; | |
b5bc6c0e YL |
368 | |
369 | work_with_active_regions(nid, add_highpages_work_fn, &data); | |
370 | } | |
371 | ||
8550eb99 | 372 | #ifndef CONFIG_NUMA |
cc9f7a0c | 373 | static void __init set_highmem_pages_init(void) |
1da177e4 | 374 | { |
cc9f7a0c | 375 | add_highpages_with_active_regions(0, highstart_pfn, highend_pfn); |
b5bc6c0e | 376 | |
1da177e4 LT |
377 | totalram_pages += totalhigh_pages; |
378 | } | |
8550eb99 | 379 | #endif /* !CONFIG_NUMA */ |
1da177e4 LT |
380 | |
381 | #else | |
8550eb99 IM |
382 | # define kmap_init() do { } while (0) |
383 | # define permanent_kmaps_init(pgd_base) do { } while (0) | |
cc9f7a0c | 384 | # define set_highmem_pages_init() do { } while (0) |
1da177e4 LT |
385 | #endif /* CONFIG_HIGHMEM */ |
386 | ||
b239fb25 | 387 | void __init native_pagetable_setup_start(pgd_t *base) |
1da177e4 | 388 | { |
551889a6 IC |
389 | unsigned long pfn, va; |
390 | pgd_t *pgd; | |
391 | pud_t *pud; | |
392 | pmd_t *pmd; | |
393 | pte_t *pte; | |
b239fb25 JF |
394 | |
395 | /* | |
551889a6 IC |
396 | * Remove any mappings which extend past the end of physical |
397 | * memory from the boot time page table: | |
b239fb25 | 398 | */ |
551889a6 IC |
399 | for (pfn = max_low_pfn + 1; pfn < 1<<(32-PAGE_SHIFT); pfn++) { |
400 | va = PAGE_OFFSET + (pfn<<PAGE_SHIFT); | |
401 | pgd = base + pgd_index(va); | |
402 | if (!pgd_present(*pgd)) | |
403 | break; | |
404 | ||
405 | pud = pud_offset(pgd, va); | |
406 | pmd = pmd_offset(pud, va); | |
407 | if (!pmd_present(*pmd)) | |
408 | break; | |
409 | ||
410 | pte = pte_offset_kernel(pmd, va); | |
411 | if (!pte_present(*pte)) | |
412 | break; | |
413 | ||
414 | pte_clear(NULL, va, pte); | |
415 | } | |
6944a9c8 | 416 | paravirt_alloc_pmd(&init_mm, __pa(base) >> PAGE_SHIFT); |
b239fb25 JF |
417 | } |
418 | ||
419 | void __init native_pagetable_setup_done(pgd_t *base) | |
420 | { | |
b239fb25 JF |
421 | } |
422 | ||
423 | /* | |
424 | * Build a proper pagetable for the kernel mappings. Up until this | |
425 | * point, we've been running on some set of pagetables constructed by | |
426 | * the boot process. | |
427 | * | |
428 | * If we're booting on native hardware, this will be a pagetable | |
551889a6 IC |
429 | * constructed in arch/x86/kernel/head_32.S. The root of the |
430 | * pagetable will be swapper_pg_dir. | |
b239fb25 JF |
431 | * |
432 | * If we're booting paravirtualized under a hypervisor, then there are | |
433 | * more options: we may already be running PAE, and the pagetable may | |
434 | * or may not be based in swapper_pg_dir. In any case, | |
435 | * paravirt_pagetable_setup_start() will set up swapper_pg_dir | |
436 | * appropriately for the rest of the initialization to work. | |
437 | * | |
438 | * In general, pagetable_init() assumes that the pagetable may already | |
439 | * be partially populated, and so it avoids stomping on any existing | |
440 | * mappings. | |
441 | */ | |
e7b37895 | 442 | static void __init early_ioremap_page_table_range_init(pgd_t *pgd_base) |
b239fb25 | 443 | { |
8550eb99 | 444 | unsigned long vaddr, end; |
b239fb25 | 445 | |
1da177e4 LT |
446 | /* |
447 | * Fixed mappings, only the page table structure has to be | |
448 | * created - mappings will be set by set_fixmap(): | |
449 | */ | |
beacfaac | 450 | early_ioremap_clear(); |
1da177e4 | 451 | vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK; |
b239fb25 JF |
452 | end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK; |
453 | page_table_range_init(vaddr, end, pgd_base); | |
beacfaac | 454 | early_ioremap_reset(); |
e7b37895 YL |
455 | } |
456 | ||
457 | static void __init pagetable_init(void) | |
458 | { | |
459 | pgd_t *pgd_base = swapper_pg_dir; | |
460 | ||
1da177e4 | 461 | permanent_kmaps_init(pgd_base); |
1da177e4 LT |
462 | } |
463 | ||
a6eb84bc | 464 | #ifdef CONFIG_ACPI_SLEEP |
1da177e4 | 465 | /* |
a6eb84bc | 466 | * ACPI suspend needs this for resume, because things like the intel-agp |
1da177e4 LT |
467 | * driver might have split up a kernel 4MB mapping. |
468 | */ | |
a6eb84bc | 469 | char swsusp_pg_dir[PAGE_SIZE] |
8550eb99 | 470 | __attribute__ ((aligned(PAGE_SIZE))); |
1da177e4 LT |
471 | |
472 | static inline void save_pg_dir(void) | |
473 | { | |
474 | memcpy(swsusp_pg_dir, swapper_pg_dir, PAGE_SIZE); | |
475 | } | |
a6eb84bc | 476 | #else /* !CONFIG_ACPI_SLEEP */ |
1da177e4 LT |
477 | static inline void save_pg_dir(void) |
478 | { | |
479 | } | |
a6eb84bc | 480 | #endif /* !CONFIG_ACPI_SLEEP */ |
1da177e4 | 481 | |
8550eb99 | 482 | void zap_low_mappings(void) |
1da177e4 LT |
483 | { |
484 | int i; | |
485 | ||
1da177e4 LT |
486 | /* |
487 | * Zap initial low-memory mappings. | |
488 | * | |
489 | * Note that "pgd_clear()" doesn't do it for | |
490 | * us, because pgd_clear() is a no-op on i386. | |
491 | */ | |
68db065c | 492 | for (i = 0; i < KERNEL_PGD_BOUNDARY; i++) { |
1da177e4 LT |
493 | #ifdef CONFIG_X86_PAE |
494 | set_pgd(swapper_pg_dir+i, __pgd(1 + __pa(empty_zero_page))); | |
495 | #else | |
496 | set_pgd(swapper_pg_dir+i, __pgd(0)); | |
497 | #endif | |
8550eb99 | 498 | } |
1da177e4 LT |
499 | flush_tlb_all(); |
500 | } | |
501 | ||
8550eb99 | 502 | int nx_enabled; |
d5321abe | 503 | |
ef5e94af | 504 | pteval_t __supported_pte_mask __read_mostly = ~(_PAGE_NX | _PAGE_GLOBAL); |
6fdc05d4 JF |
505 | EXPORT_SYMBOL_GPL(__supported_pte_mask); |
506 | ||
d5321abe JB |
507 | #ifdef CONFIG_X86_PAE |
508 | ||
8550eb99 | 509 | static int disable_nx __initdata; |
1da177e4 LT |
510 | |
511 | /* | |
512 | * noexec = on|off | |
513 | * | |
514 | * Control non executable mappings. | |
515 | * | |
516 | * on Enable | |
517 | * off Disable | |
518 | */ | |
1a3f239d | 519 | static int __init noexec_setup(char *str) |
1da177e4 | 520 | { |
1a3f239d RR |
521 | if (!str || !strcmp(str, "on")) { |
522 | if (cpu_has_nx) { | |
523 | __supported_pte_mask |= _PAGE_NX; | |
524 | disable_nx = 0; | |
525 | } | |
8550eb99 IM |
526 | } else { |
527 | if (!strcmp(str, "off")) { | |
528 | disable_nx = 1; | |
529 | __supported_pte_mask &= ~_PAGE_NX; | |
530 | } else { | |
531 | return -EINVAL; | |
532 | } | |
533 | } | |
1a3f239d RR |
534 | |
535 | return 0; | |
1da177e4 | 536 | } |
1a3f239d | 537 | early_param("noexec", noexec_setup); |
1da177e4 | 538 | |
1da177e4 LT |
539 | static void __init set_nx(void) |
540 | { | |
541 | unsigned int v[4], l, h; | |
542 | ||
543 | if (cpu_has_pae && (cpuid_eax(0x80000000) > 0x80000001)) { | |
544 | cpuid(0x80000001, &v[0], &v[1], &v[2], &v[3]); | |
8550eb99 | 545 | |
1da177e4 LT |
546 | if ((v[3] & (1 << 20)) && !disable_nx) { |
547 | rdmsr(MSR_EFER, l, h); | |
548 | l |= EFER_NX; | |
549 | wrmsr(MSR_EFER, l, h); | |
550 | nx_enabled = 1; | |
551 | __supported_pte_mask |= _PAGE_NX; | |
552 | } | |
553 | } | |
554 | } | |
1da177e4 LT |
555 | #endif |
556 | ||
90d967e0 YL |
557 | /* user-defined highmem size */ |
558 | static unsigned int highmem_pages = -1; | |
559 | ||
560 | /* | |
561 | * highmem=size forces highmem to be exactly 'size' bytes. | |
562 | * This works even on boxes that have no highmem otherwise. | |
563 | * This also works to reduce highmem size on bigger boxes. | |
564 | */ | |
565 | static int __init parse_highmem(char *arg) | |
566 | { | |
567 | if (!arg) | |
568 | return -EINVAL; | |
569 | ||
570 | highmem_pages = memparse(arg, &arg) >> PAGE_SHIFT; | |
571 | return 0; | |
572 | } | |
573 | early_param("highmem", parse_highmem); | |
574 | ||
575 | /* | |
576 | * Determine low and high memory ranges: | |
577 | */ | |
2ec65f8b | 578 | void __init find_low_pfn_range(void) |
90d967e0 | 579 | { |
2ec65f8b YL |
580 | /* it could update max_pfn */ |
581 | ||
346cafec | 582 | /* max_low_pfn is 0, we already have early_res support */ |
90d967e0 YL |
583 | |
584 | max_low_pfn = max_pfn; | |
585 | if (max_low_pfn > MAXMEM_PFN) { | |
586 | if (highmem_pages == -1) | |
587 | highmem_pages = max_pfn - MAXMEM_PFN; | |
588 | if (highmem_pages + MAXMEM_PFN < max_pfn) | |
589 | max_pfn = MAXMEM_PFN + highmem_pages; | |
590 | if (highmem_pages + MAXMEM_PFN > max_pfn) { | |
591 | printk(KERN_WARNING "only %luMB highmem pages " | |
592 | "available, ignoring highmem size of %uMB.\n", | |
593 | pages_to_mb(max_pfn - MAXMEM_PFN), | |
594 | pages_to_mb(highmem_pages)); | |
595 | highmem_pages = 0; | |
596 | } | |
597 | max_low_pfn = MAXMEM_PFN; | |
598 | #ifndef CONFIG_HIGHMEM | |
599 | /* Maximum memory usable is what is directly addressable */ | |
600 | printk(KERN_WARNING "Warning only %ldMB will be used.\n", | |
601 | MAXMEM>>20); | |
602 | if (max_pfn > MAX_NONPAE_PFN) | |
603 | printk(KERN_WARNING | |
604 | "Use a HIGHMEM64G enabled kernel.\n"); | |
605 | else | |
606 | printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n"); | |
607 | max_pfn = MAXMEM_PFN; | |
608 | #else /* !CONFIG_HIGHMEM */ | |
609 | #ifndef CONFIG_HIGHMEM64G | |
610 | if (max_pfn > MAX_NONPAE_PFN) { | |
611 | max_pfn = MAX_NONPAE_PFN; | |
612 | printk(KERN_WARNING "Warning only 4GB will be used." | |
613 | "Use a HIGHMEM64G enabled kernel.\n"); | |
614 | } | |
615 | #endif /* !CONFIG_HIGHMEM64G */ | |
616 | #endif /* !CONFIG_HIGHMEM */ | |
617 | } else { | |
618 | if (highmem_pages == -1) | |
619 | highmem_pages = 0; | |
620 | #ifdef CONFIG_HIGHMEM | |
621 | if (highmem_pages >= max_pfn) { | |
622 | printk(KERN_ERR "highmem size specified (%uMB) is " | |
623 | "bigger than pages available (%luMB)!.\n", | |
624 | pages_to_mb(highmem_pages), | |
625 | pages_to_mb(max_pfn)); | |
626 | highmem_pages = 0; | |
627 | } | |
628 | if (highmem_pages) { | |
629 | if (max_low_pfn - highmem_pages < | |
630 | 64*1024*1024/PAGE_SIZE){ | |
631 | printk(KERN_ERR "highmem size %uMB results in " | |
632 | "smaller than 64MB lowmem, ignoring it.\n" | |
633 | , pages_to_mb(highmem_pages)); | |
634 | highmem_pages = 0; | |
635 | } | |
636 | max_low_pfn -= highmem_pages; | |
637 | } | |
638 | #else | |
639 | if (highmem_pages) | |
640 | printk(KERN_ERR "ignoring highmem size on non-highmem" | |
641 | " kernel!\n"); | |
642 | #endif | |
643 | } | |
90d967e0 YL |
644 | } |
645 | ||
b2ac82a0 | 646 | #ifndef CONFIG_NEED_MULTIPLE_NODES |
2ec65f8b | 647 | void __init initmem_init(unsigned long start_pfn, |
b2ac82a0 YL |
648 | unsigned long end_pfn) |
649 | { | |
b2ac82a0 YL |
650 | #ifdef CONFIG_HIGHMEM |
651 | highstart_pfn = highend_pfn = max_pfn; | |
652 | if (max_pfn > max_low_pfn) | |
653 | highstart_pfn = max_low_pfn; | |
654 | memory_present(0, 0, highend_pfn); | |
cb95a13a | 655 | e820_register_active_regions(0, 0, highend_pfn); |
b2ac82a0 YL |
656 | printk(KERN_NOTICE "%ldMB HIGHMEM available.\n", |
657 | pages_to_mb(highend_pfn - highstart_pfn)); | |
658 | num_physpages = highend_pfn; | |
659 | high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1; | |
660 | #else | |
661 | memory_present(0, 0, max_low_pfn); | |
cb95a13a | 662 | e820_register_active_regions(0, 0, max_low_pfn); |
b2ac82a0 YL |
663 | num_physpages = max_low_pfn; |
664 | high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1; | |
665 | #endif | |
666 | #ifdef CONFIG_FLATMEM | |
667 | max_mapnr = num_physpages; | |
668 | #endif | |
669 | printk(KERN_NOTICE "%ldMB LOWMEM available.\n", | |
670 | pages_to_mb(max_low_pfn)); | |
671 | ||
672 | setup_bootmem_allocator(); | |
b2ac82a0 | 673 | } |
cb95a13a | 674 | #endif /* !CONFIG_NEED_MULTIPLE_NODES */ |
b2ac82a0 | 675 | |
cb95a13a | 676 | static void __init zone_sizes_init(void) |
b2ac82a0 YL |
677 | { |
678 | unsigned long max_zone_pfns[MAX_NR_ZONES]; | |
679 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); | |
680 | max_zone_pfns[ZONE_DMA] = | |
681 | virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT; | |
682 | max_zone_pfns[ZONE_NORMAL] = max_low_pfn; | |
b2ac82a0 YL |
683 | #ifdef CONFIG_HIGHMEM |
684 | max_zone_pfns[ZONE_HIGHMEM] = highend_pfn; | |
b2ac82a0 YL |
685 | #endif |
686 | ||
687 | free_area_init_nodes(max_zone_pfns); | |
688 | } | |
b2ac82a0 | 689 | |
b2ac82a0 YL |
690 | void __init setup_bootmem_allocator(void) |
691 | { | |
692 | int i; | |
693 | unsigned long bootmap_size, bootmap; | |
694 | /* | |
695 | * Initialize the boot-time allocator (with low memory only): | |
696 | */ | |
697 | bootmap_size = bootmem_bootmap_pages(max_low_pfn)<<PAGE_SHIFT; | |
698 | bootmap = find_e820_area(min_low_pfn<<PAGE_SHIFT, | |
699 | max_pfn_mapped<<PAGE_SHIFT, bootmap_size, | |
700 | PAGE_SIZE); | |
701 | if (bootmap == -1L) | |
702 | panic("Cannot find bootmem map of size %ld\n", bootmap_size); | |
703 | reserve_early(bootmap, bootmap + bootmap_size, "BOOTMAP"); | |
225c37d7 | 704 | |
346cafec YL |
705 | /* don't touch min_low_pfn */ |
706 | bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap >> PAGE_SHIFT, | |
707 | min_low_pfn, max_low_pfn); | |
b2ac82a0 YL |
708 | printk(KERN_INFO " mapped low ram: 0 - %08lx\n", |
709 | max_pfn_mapped<<PAGE_SHIFT); | |
710 | printk(KERN_INFO " low ram: %08lx - %08lx\n", | |
711 | min_low_pfn<<PAGE_SHIFT, max_low_pfn<<PAGE_SHIFT); | |
712 | printk(KERN_INFO " bootmap %08lx - %08lx\n", | |
713 | bootmap, bootmap + bootmap_size); | |
714 | for_each_online_node(i) | |
715 | free_bootmem_with_active_regions(i, max_low_pfn); | |
716 | early_res_to_bootmem(0, max_low_pfn<<PAGE_SHIFT); | |
717 | ||
4e29684c | 718 | after_init_bootmem = 1; |
b2ac82a0 YL |
719 | } |
720 | ||
4e29684c YL |
721 | static void __init find_early_table_space(unsigned long end) |
722 | { | |
7482b0e9 | 723 | unsigned long puds, pmds, ptes, tables, start; |
4e29684c YL |
724 | |
725 | puds = (end + PUD_SIZE - 1) >> PUD_SHIFT; | |
726 | tables = PAGE_ALIGN(puds * sizeof(pud_t)); | |
727 | ||
728 | pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT; | |
729 | tables += PAGE_ALIGN(pmds * sizeof(pmd_t)); | |
730 | ||
7482b0e9 YL |
731 | if (cpu_has_pse) { |
732 | unsigned long extra; | |
a04ad82d YL |
733 | |
734 | extra = end - ((end>>PMD_SHIFT) << PMD_SHIFT); | |
735 | extra += PMD_SIZE; | |
7482b0e9 YL |
736 | ptes = (extra + PAGE_SIZE - 1) >> PAGE_SHIFT; |
737 | } else | |
738 | ptes = (end + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
739 | ||
740 | tables += PAGE_ALIGN(ptes * sizeof(pte_t)); | |
8207c257 | 741 | |
a04ad82d YL |
742 | /* for fixmap */ |
743 | tables += PAGE_SIZE * 2; | |
744 | ||
4e29684c YL |
745 | /* |
746 | * RED-PEN putting page tables only on node 0 could | |
747 | * cause a hotspot and fill up ZONE_DMA. The page tables | |
748 | * need roughly 0.5KB per GB. | |
749 | */ | |
750 | start = 0x7000; | |
751 | table_start = find_e820_area(start, max_pfn_mapped<<PAGE_SHIFT, | |
752 | tables, PAGE_SIZE); | |
753 | if (table_start == -1UL) | |
754 | panic("Cannot find space for the kernel page tables"); | |
755 | ||
756 | table_start >>= PAGE_SHIFT; | |
757 | table_end = table_start; | |
758 | table_top = table_start + (tables>>PAGE_SHIFT); | |
759 | ||
760 | printk(KERN_DEBUG "kernel direct mapping tables up to %lx @ %lx-%lx\n", | |
761 | end, table_start << PAGE_SHIFT, | |
762 | (table_start << PAGE_SHIFT) + tables); | |
763 | } | |
764 | ||
765 | unsigned long __init_refok init_memory_mapping(unsigned long start, | |
766 | unsigned long end) | |
767 | { | |
768 | pgd_t *pgd_base = swapper_pg_dir; | |
a04ad82d YL |
769 | unsigned long start_pfn, end_pfn; |
770 | unsigned long big_page_start; | |
4e29684c YL |
771 | |
772 | /* | |
773 | * Find space for the kernel direct mapping tables. | |
774 | */ | |
775 | if (!after_init_bootmem) | |
776 | find_early_table_space(end); | |
777 | ||
778 | #ifdef CONFIG_X86_PAE | |
779 | set_nx(); | |
780 | if (nx_enabled) | |
781 | printk(KERN_INFO "NX (Execute Disable) protection: active\n"); | |
782 | #endif | |
783 | ||
784 | /* Enable PSE if available */ | |
785 | if (cpu_has_pse) | |
786 | set_in_cr4(X86_CR4_PSE); | |
787 | ||
788 | /* Enable PGE if available */ | |
789 | if (cpu_has_pge) { | |
790 | set_in_cr4(X86_CR4_PGE); | |
ef5e94af | 791 | __supported_pte_mask |= _PAGE_GLOBAL; |
4e29684c YL |
792 | } |
793 | ||
a04ad82d YL |
794 | /* |
795 | * Don't use a large page for the first 2/4MB of memory | |
796 | * because there are often fixed size MTRRs in there | |
797 | * and overlapping MTRRs into large pages can cause | |
798 | * slowdowns. | |
799 | */ | |
800 | big_page_start = PMD_SIZE; | |
801 | ||
802 | if (start < big_page_start) { | |
803 | start_pfn = start >> PAGE_SHIFT; | |
804 | end_pfn = min(big_page_start>>PAGE_SHIFT, end>>PAGE_SHIFT); | |
805 | } else { | |
806 | /* head is not big page alignment ? */ | |
807 | start_pfn = start >> PAGE_SHIFT; | |
808 | end_pfn = ((start + (PMD_SIZE - 1))>>PMD_SHIFT) | |
809 | << (PMD_SHIFT - PAGE_SHIFT); | |
810 | } | |
811 | if (start_pfn < end_pfn) | |
812 | kernel_physical_mapping_init(pgd_base, start_pfn, end_pfn, 0); | |
813 | ||
814 | /* big page range */ | |
815 | start_pfn = ((start + (PMD_SIZE - 1))>>PMD_SHIFT) | |
816 | << (PMD_SHIFT - PAGE_SHIFT); | |
817 | if (start_pfn < (big_page_start >> PAGE_SHIFT)) | |
818 | start_pfn = big_page_start >> PAGE_SHIFT; | |
819 | end_pfn = (end>>PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT); | |
820 | if (start_pfn < end_pfn) | |
821 | kernel_physical_mapping_init(pgd_base, start_pfn, end_pfn, | |
822 | cpu_has_pse); | |
823 | ||
824 | /* tail is not big page alignment ? */ | |
825 | start_pfn = end_pfn; | |
826 | if (start_pfn > (big_page_start>>PAGE_SHIFT)) { | |
827 | end_pfn = end >> PAGE_SHIFT; | |
828 | if (start_pfn < end_pfn) | |
829 | kernel_physical_mapping_init(pgd_base, start_pfn, | |
830 | end_pfn, 0); | |
831 | } | |
4e29684c | 832 | |
e7b37895 YL |
833 | early_ioremap_page_table_range_init(pgd_base); |
834 | ||
4e29684c YL |
835 | load_cr3(swapper_pg_dir); |
836 | ||
837 | __flush_tlb_all(); | |
838 | ||
839 | if (!after_init_bootmem) | |
840 | reserve_early(table_start << PAGE_SHIFT, | |
841 | table_end << PAGE_SHIFT, "PGTABLE"); | |
842 | ||
caadbdce YL |
843 | if (!after_init_bootmem) |
844 | early_memtest(start, end); | |
845 | ||
4e29684c YL |
846 | return end >> PAGE_SHIFT; |
847 | } | |
848 | ||
e7b37895 | 849 | |
1da177e4 LT |
850 | /* |
851 | * paging_init() sets up the page tables - note that the first 8MB are | |
852 | * already mapped by head.S. | |
853 | * | |
854 | * This routines also unmaps the page at virtual kernel address 0, so | |
855 | * that we can trap those pesky NULL-reference errors in the kernel. | |
856 | */ | |
857 | void __init paging_init(void) | |
858 | { | |
1da177e4 LT |
859 | pagetable_init(); |
860 | ||
1da177e4 LT |
861 | __flush_tlb_all(); |
862 | ||
863 | kmap_init(); | |
11cd0bc1 YL |
864 | |
865 | /* | |
866 | * NOTE: at this point the bootmem allocator is fully available. | |
867 | */ | |
11cd0bc1 YL |
868 | sparse_init(); |
869 | zone_sizes_init(); | |
1da177e4 LT |
870 | } |
871 | ||
872 | /* | |
873 | * Test if the WP bit works in supervisor mode. It isn't supported on 386's | |
f7f17a67 DV |
874 | * and also on some strange 486's. All 586+'s are OK. This used to involve |
875 | * black magic jumps to work around some nasty CPU bugs, but fortunately the | |
876 | * switch to using exceptions got rid of all that. | |
1da177e4 | 877 | */ |
1da177e4 LT |
878 | static void __init test_wp_bit(void) |
879 | { | |
d7d119d7 IM |
880 | printk(KERN_INFO |
881 | "Checking if this processor honours the WP bit even in supervisor mode..."); | |
1da177e4 LT |
882 | |
883 | /* Any page-aligned address will do, the test is non-destructive */ | |
884 | __set_fixmap(FIX_WP_TEST, __pa(&swapper_pg_dir), PAGE_READONLY); | |
885 | boot_cpu_data.wp_works_ok = do_test_wp_bit(); | |
886 | clear_fixmap(FIX_WP_TEST); | |
887 | ||
888 | if (!boot_cpu_data.wp_works_ok) { | |
d7d119d7 | 889 | printk(KERN_CONT "No.\n"); |
1da177e4 | 890 | #ifdef CONFIG_X86_WP_WORKS_OK |
d7d119d7 IM |
891 | panic( |
892 | "This kernel doesn't support CPU's with broken WP. Recompile it for a 386!"); | |
1da177e4 LT |
893 | #endif |
894 | } else { | |
d7d119d7 | 895 | printk(KERN_CONT "Ok.\n"); |
1da177e4 LT |
896 | } |
897 | } | |
898 | ||
8550eb99 | 899 | static struct kcore_list kcore_mem, kcore_vmalloc; |
1da177e4 LT |
900 | |
901 | void __init mem_init(void) | |
902 | { | |
1da177e4 | 903 | int codesize, reservedpages, datasize, initsize; |
cc9f7a0c | 904 | int tmp; |
1da177e4 | 905 | |
05b79bdc | 906 | #ifdef CONFIG_FLATMEM |
8d8f3cbe | 907 | BUG_ON(!mem_map); |
1da177e4 | 908 | #endif |
1da177e4 LT |
909 | /* this will put all low memory onto the freelists */ |
910 | totalram_pages += free_all_bootmem(); | |
911 | ||
912 | reservedpages = 0; | |
913 | for (tmp = 0; tmp < max_low_pfn; tmp++) | |
914 | /* | |
8550eb99 | 915 | * Only count reserved RAM pages: |
1da177e4 LT |
916 | */ |
917 | if (page_is_ram(tmp) && PageReserved(pfn_to_page(tmp))) | |
918 | reservedpages++; | |
919 | ||
cc9f7a0c | 920 | set_highmem_pages_init(); |
1da177e4 LT |
921 | |
922 | codesize = (unsigned long) &_etext - (unsigned long) &_text; | |
923 | datasize = (unsigned long) &_edata - (unsigned long) &_etext; | |
924 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; | |
925 | ||
8550eb99 IM |
926 | kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT); |
927 | kclist_add(&kcore_vmalloc, (void *)VMALLOC_START, | |
1da177e4 LT |
928 | VMALLOC_END-VMALLOC_START); |
929 | ||
8550eb99 IM |
930 | printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, " |
931 | "%dk reserved, %dk data, %dk init, %ldk highmem)\n", | |
1da177e4 LT |
932 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), |
933 | num_physpages << (PAGE_SHIFT-10), | |
934 | codesize >> 10, | |
935 | reservedpages << (PAGE_SHIFT-10), | |
936 | datasize >> 10, | |
937 | initsize >> 10, | |
938 | (unsigned long) (totalhigh_pages << (PAGE_SHIFT-10)) | |
939 | ); | |
940 | ||
d7d119d7 | 941 | printk(KERN_INFO "virtual kernel memory layout:\n" |
8550eb99 | 942 | " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" |
052e7994 | 943 | #ifdef CONFIG_HIGHMEM |
8550eb99 | 944 | " pkmap : 0x%08lx - 0x%08lx (%4ld kB)\n" |
052e7994 | 945 | #endif |
8550eb99 IM |
946 | " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" |
947 | " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
948 | " .init : 0x%08lx - 0x%08lx (%4ld kB)\n" | |
949 | " .data : 0x%08lx - 0x%08lx (%4ld kB)\n" | |
950 | " .text : 0x%08lx - 0x%08lx (%4ld kB)\n", | |
951 | FIXADDR_START, FIXADDR_TOP, | |
952 | (FIXADDR_TOP - FIXADDR_START) >> 10, | |
052e7994 JF |
953 | |
954 | #ifdef CONFIG_HIGHMEM | |
8550eb99 IM |
955 | PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE, |
956 | (LAST_PKMAP*PAGE_SIZE) >> 10, | |
052e7994 JF |
957 | #endif |
958 | ||
8550eb99 IM |
959 | VMALLOC_START, VMALLOC_END, |
960 | (VMALLOC_END - VMALLOC_START) >> 20, | |
052e7994 | 961 | |
8550eb99 IM |
962 | (unsigned long)__va(0), (unsigned long)high_memory, |
963 | ((unsigned long)high_memory - (unsigned long)__va(0)) >> 20, | |
052e7994 | 964 | |
8550eb99 IM |
965 | (unsigned long)&__init_begin, (unsigned long)&__init_end, |
966 | ((unsigned long)&__init_end - | |
967 | (unsigned long)&__init_begin) >> 10, | |
052e7994 | 968 | |
8550eb99 IM |
969 | (unsigned long)&_etext, (unsigned long)&_edata, |
970 | ((unsigned long)&_edata - (unsigned long)&_etext) >> 10, | |
052e7994 | 971 | |
8550eb99 IM |
972 | (unsigned long)&_text, (unsigned long)&_etext, |
973 | ((unsigned long)&_etext - (unsigned long)&_text) >> 10); | |
052e7994 JF |
974 | |
975 | #ifdef CONFIG_HIGHMEM | |
8550eb99 IM |
976 | BUG_ON(PKMAP_BASE + LAST_PKMAP*PAGE_SIZE > FIXADDR_START); |
977 | BUG_ON(VMALLOC_END > PKMAP_BASE); | |
052e7994 | 978 | #endif |
8550eb99 IM |
979 | BUG_ON(VMALLOC_START > VMALLOC_END); |
980 | BUG_ON((unsigned long)high_memory > VMALLOC_START); | |
052e7994 | 981 | |
1da177e4 LT |
982 | if (boot_cpu_data.wp_works_ok < 0) |
983 | test_wp_bit(); | |
984 | ||
76ebd054 | 985 | cpa_init(); |
61165d7a | 986 | save_pg_dir(); |
1da177e4 | 987 | zap_low_mappings(); |
1da177e4 LT |
988 | } |
989 | ||
ad8f5797 | 990 | #ifdef CONFIG_MEMORY_HOTPLUG |
bc02af93 | 991 | int arch_add_memory(int nid, u64 start, u64 size) |
05039b92 | 992 | { |
7c7e9425 | 993 | struct pglist_data *pgdata = NODE_DATA(nid); |
776ed98b | 994 | struct zone *zone = pgdata->node_zones + ZONE_HIGHMEM; |
05039b92 DH |
995 | unsigned long start_pfn = start >> PAGE_SHIFT; |
996 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
997 | ||
998 | return __add_pages(zone, start_pfn, nr_pages); | |
999 | } | |
9d99aaa3 | 1000 | #endif |
05039b92 | 1001 | |
1da177e4 LT |
1002 | /* |
1003 | * This function cannot be __init, since exceptions don't work in that | |
1004 | * section. Put this after the callers, so that it cannot be inlined. | |
1005 | */ | |
8550eb99 | 1006 | static noinline int do_test_wp_bit(void) |
1da177e4 LT |
1007 | { |
1008 | char tmp_reg; | |
1009 | int flag; | |
1010 | ||
1011 | __asm__ __volatile__( | |
8550eb99 IM |
1012 | " movb %0, %1 \n" |
1013 | "1: movb %1, %0 \n" | |
1014 | " xorl %2, %2 \n" | |
1da177e4 | 1015 | "2: \n" |
f832ff18 | 1016 | _ASM_EXTABLE(1b,2b) |
1da177e4 LT |
1017 | :"=m" (*(char *)fix_to_virt(FIX_WP_TEST)), |
1018 | "=q" (tmp_reg), | |
1019 | "=r" (flag) | |
1020 | :"2" (1) | |
1021 | :"memory"); | |
8550eb99 | 1022 | |
1da177e4 LT |
1023 | return flag; |
1024 | } | |
1025 | ||
63aaf308 | 1026 | #ifdef CONFIG_DEBUG_RODATA |
edeed305 AV |
1027 | const int rodata_test_data = 0xC3; |
1028 | EXPORT_SYMBOL_GPL(rodata_test_data); | |
63aaf308 | 1029 | |
63aaf308 AV |
1030 | void mark_rodata_ro(void) |
1031 | { | |
6fb14755 JB |
1032 | unsigned long start = PFN_ALIGN(_text); |
1033 | unsigned long size = PFN_ALIGN(_etext) - start; | |
63aaf308 | 1034 | |
8f0f996e SR |
1035 | #ifndef CONFIG_DYNAMIC_FTRACE |
1036 | /* Dynamic tracing modifies the kernel text section */ | |
4e4eee0e MD |
1037 | set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT); |
1038 | printk(KERN_INFO "Write protecting the kernel text: %luk\n", | |
1039 | size >> 10); | |
0c42f392 AK |
1040 | |
1041 | #ifdef CONFIG_CPA_DEBUG | |
4e4eee0e MD |
1042 | printk(KERN_INFO "Testing CPA: Reverting %lx-%lx\n", |
1043 | start, start+size); | |
1044 | set_pages_rw(virt_to_page(start), size>>PAGE_SHIFT); | |
0c42f392 | 1045 | |
4e4eee0e MD |
1046 | printk(KERN_INFO "Testing CPA: write protecting again\n"); |
1047 | set_pages_ro(virt_to_page(start), size>>PAGE_SHIFT); | |
602033ed | 1048 | #endif |
8f0f996e SR |
1049 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
1050 | ||
6fb14755 JB |
1051 | start += size; |
1052 | size = (unsigned long)__end_rodata - start; | |
6d238cc4 | 1053 | set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT); |
d7d119d7 IM |
1054 | printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n", |
1055 | size >> 10); | |
edeed305 | 1056 | rodata_test(); |
63aaf308 | 1057 | |
0c42f392 | 1058 | #ifdef CONFIG_CPA_DEBUG |
d7d119d7 | 1059 | printk(KERN_INFO "Testing CPA: undo %lx-%lx\n", start, start + size); |
6d238cc4 | 1060 | set_pages_rw(virt_to_page(start), size >> PAGE_SHIFT); |
0c42f392 | 1061 | |
d7d119d7 | 1062 | printk(KERN_INFO "Testing CPA: write protecting again\n"); |
6d238cc4 | 1063 | set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT); |
0c42f392 | 1064 | #endif |
63aaf308 AV |
1065 | } |
1066 | #endif | |
1067 | ||
9a0b5817 GH |
1068 | void free_init_pages(char *what, unsigned long begin, unsigned long end) |
1069 | { | |
ee01f112 IM |
1070 | #ifdef CONFIG_DEBUG_PAGEALLOC |
1071 | /* | |
1072 | * If debugging page accesses then do not free this memory but | |
1073 | * mark them not present - any buggy init-section access will | |
1074 | * create a kernel page fault: | |
1075 | */ | |
1076 | printk(KERN_INFO "debug: unmapping init memory %08lx..%08lx\n", | |
1077 | begin, PAGE_ALIGN(end)); | |
1078 | set_memory_np(begin, (end - begin) >> PAGE_SHIFT); | |
1079 | #else | |
86f03989 IM |
1080 | unsigned long addr; |
1081 | ||
3c1df68b AV |
1082 | /* |
1083 | * We just marked the kernel text read only above, now that | |
1084 | * we are going to free part of that, we need to make that | |
1085 | * writeable first. | |
1086 | */ | |
1087 | set_memory_rw(begin, (end - begin) >> PAGE_SHIFT); | |
1088 | ||
9a0b5817 | 1089 | for (addr = begin; addr < end; addr += PAGE_SIZE) { |
e3ebadd9 LT |
1090 | ClearPageReserved(virt_to_page(addr)); |
1091 | init_page_count(virt_to_page(addr)); | |
1092 | memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE); | |
1093 | free_page(addr); | |
9a0b5817 GH |
1094 | totalram_pages++; |
1095 | } | |
6fb14755 | 1096 | printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10); |
ee01f112 | 1097 | #endif |
9a0b5817 GH |
1098 | } |
1099 | ||
1100 | void free_initmem(void) | |
1101 | { | |
1102 | free_init_pages("unused kernel memory", | |
e3ebadd9 LT |
1103 | (unsigned long)(&__init_begin), |
1104 | (unsigned long)(&__init_end)); | |
9a0b5817 | 1105 | } |
63aaf308 | 1106 | |
1da177e4 LT |
1107 | #ifdef CONFIG_BLK_DEV_INITRD |
1108 | void free_initrd_mem(unsigned long start, unsigned long end) | |
1109 | { | |
e3ebadd9 | 1110 | free_init_pages("initrd memory", start, end); |
1da177e4 LT |
1111 | } |
1112 | #endif | |
d2dbf343 YL |
1113 | |
1114 | int __init reserve_bootmem_generic(unsigned long phys, unsigned long len, | |
1115 | int flags) | |
1116 | { | |
1117 | return reserve_bootmem(phys, len, flags); | |
1118 | } |