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> |
a80495ec | 50 | #include <asm/smp.h> |
1da177e4 LT |
51 | |
52 | unsigned int __VMALLOC_RESERVE = 128 << 20; | |
53 | ||
f361a450 | 54 | unsigned long max_low_pfn_mapped; |
67794292 | 55 | unsigned long max_pfn_mapped; |
7d1116a9 | 56 | |
1da177e4 LT |
57 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); |
58 | unsigned long highstart_pfn, highend_pfn; | |
59 | ||
8550eb99 | 60 | static noinline int do_test_wp_bit(void); |
1da177e4 | 61 | |
4e29684c YL |
62 | |
63 | static unsigned long __initdata table_start; | |
64 | static unsigned long __meminitdata table_end; | |
65 | static unsigned long __meminitdata table_top; | |
66 | ||
67 | static int __initdata after_init_bootmem; | |
68 | ||
69 | static __init void *alloc_low_page(unsigned long *phys) | |
70 | { | |
71 | unsigned long pfn = table_end++; | |
72 | void *adr; | |
73 | ||
74 | if (pfn >= table_top) | |
75 | panic("alloc_low_page: ran out of memory"); | |
76 | ||
77 | adr = __va(pfn * PAGE_SIZE); | |
78 | memset(adr, 0, PAGE_SIZE); | |
79 | *phys = pfn * PAGE_SIZE; | |
80 | return adr; | |
81 | } | |
82 | ||
1da177e4 LT |
83 | /* |
84 | * Creates a middle page table and puts a pointer to it in the | |
85 | * given global directory entry. This only returns the gd entry | |
86 | * in non-PAE compilation mode, since the middle layer is folded. | |
87 | */ | |
88 | static pmd_t * __init one_md_table_init(pgd_t *pgd) | |
89 | { | |
90 | pud_t *pud; | |
91 | pmd_t *pmd_table; | |
8550eb99 | 92 | |
1da177e4 | 93 | #ifdef CONFIG_X86_PAE |
4e29684c | 94 | unsigned long phys; |
b239fb25 | 95 | if (!(pgd_val(*pgd) & _PAGE_PRESENT)) { |
4e29684c YL |
96 | if (after_init_bootmem) |
97 | pmd_table = (pmd_t *)alloc_bootmem_low_pages(PAGE_SIZE); | |
98 | else | |
99 | pmd_table = (pmd_t *)alloc_low_page(&phys); | |
6944a9c8 | 100 | paravirt_alloc_pmd(&init_mm, __pa(pmd_table) >> PAGE_SHIFT); |
b239fb25 JF |
101 | set_pgd(pgd, __pgd(__pa(pmd_table) | _PAGE_PRESENT)); |
102 | pud = pud_offset(pgd, 0); | |
8550eb99 | 103 | BUG_ON(pmd_table != pmd_offset(pud, 0)); |
b239fb25 JF |
104 | } |
105 | #endif | |
1da177e4 LT |
106 | pud = pud_offset(pgd, 0); |
107 | pmd_table = pmd_offset(pud, 0); | |
8550eb99 | 108 | |
1da177e4 LT |
109 | return pmd_table; |
110 | } | |
111 | ||
112 | /* | |
113 | * Create a page table and place a pointer to it in a middle page | |
8550eb99 | 114 | * directory entry: |
1da177e4 LT |
115 | */ |
116 | static pte_t * __init one_page_table_init(pmd_t *pmd) | |
117 | { | |
b239fb25 | 118 | if (!(pmd_val(*pmd) & _PAGE_PRESENT)) { |
509a80c4 IM |
119 | pte_t *page_table = NULL; |
120 | ||
4e29684c | 121 | if (after_init_bootmem) { |
509a80c4 | 122 | #ifdef CONFIG_DEBUG_PAGEALLOC |
4e29684c | 123 | page_table = (pte_t *) alloc_bootmem_pages(PAGE_SIZE); |
509a80c4 | 124 | #endif |
4e29684c YL |
125 | if (!page_table) |
126 | page_table = | |
509a80c4 | 127 | (pte_t *)alloc_bootmem_low_pages(PAGE_SIZE); |
4e29684c YL |
128 | } else { |
129 | unsigned long phys; | |
130 | page_table = (pte_t *)alloc_low_page(&phys); | |
8550eb99 | 131 | } |
b239fb25 | 132 | |
6944a9c8 | 133 | paravirt_alloc_pte(&init_mm, __pa(page_table) >> PAGE_SHIFT); |
1da177e4 | 134 | set_pmd(pmd, __pmd(__pa(page_table) | _PAGE_TABLE)); |
b239fb25 | 135 | BUG_ON(page_table != pte_offset_kernel(pmd, 0)); |
1da177e4 | 136 | } |
509a80c4 | 137 | |
1da177e4 LT |
138 | return pte_offset_kernel(pmd, 0); |
139 | } | |
140 | ||
141 | /* | |
8550eb99 | 142 | * This function initializes a certain range of kernel virtual memory |
1da177e4 LT |
143 | * with new bootmem page tables, everywhere page tables are missing in |
144 | * the given range. | |
8550eb99 IM |
145 | * |
146 | * NOTE: The pagetables are allocated contiguous on the physical space | |
147 | * so we can cache the place of the first one and move around without | |
1da177e4 LT |
148 | * checking the pgd every time. |
149 | */ | |
8550eb99 IM |
150 | static void __init |
151 | page_table_range_init(unsigned long start, unsigned long end, pgd_t *pgd_base) | |
1da177e4 | 152 | { |
1da177e4 LT |
153 | int pgd_idx, pmd_idx; |
154 | unsigned long vaddr; | |
8550eb99 IM |
155 | pgd_t *pgd; |
156 | pmd_t *pmd; | |
1da177e4 LT |
157 | |
158 | vaddr = start; | |
159 | pgd_idx = pgd_index(vaddr); | |
160 | pmd_idx = pmd_index(vaddr); | |
161 | pgd = pgd_base + pgd_idx; | |
162 | ||
163 | for ( ; (pgd_idx < PTRS_PER_PGD) && (vaddr != end); pgd++, pgd_idx++) { | |
b239fb25 JF |
164 | pmd = one_md_table_init(pgd); |
165 | pmd = pmd + pmd_index(vaddr); | |
8550eb99 IM |
166 | for (; (pmd_idx < PTRS_PER_PMD) && (vaddr != end); |
167 | pmd++, pmd_idx++) { | |
b239fb25 | 168 | one_page_table_init(pmd); |
1da177e4 LT |
169 | |
170 | vaddr += PMD_SIZE; | |
171 | } | |
172 | pmd_idx = 0; | |
173 | } | |
174 | } | |
175 | ||
176 | static inline int is_kernel_text(unsigned long addr) | |
177 | { | |
178 | if (addr >= PAGE_OFFSET && addr <= (unsigned long)__init_end) | |
179 | return 1; | |
180 | return 0; | |
181 | } | |
182 | ||
183 | /* | |
8550eb99 IM |
184 | * This maps the physical memory to kernel virtual address space, a total |
185 | * of max_low_pfn pages, by creating page tables starting from address | |
186 | * PAGE_OFFSET: | |
1da177e4 | 187 | */ |
4e29684c | 188 | static void __init kernel_physical_mapping_init(pgd_t *pgd_base, |
a04ad82d YL |
189 | unsigned long start_pfn, |
190 | unsigned long end_pfn, | |
191 | int use_pse) | |
1da177e4 | 192 | { |
8550eb99 | 193 | int pgd_idx, pmd_idx, pte_ofs; |
1da177e4 LT |
194 | unsigned long pfn; |
195 | pgd_t *pgd; | |
196 | pmd_t *pmd; | |
197 | pte_t *pte; | |
ce0c0e50 | 198 | unsigned pages_2m = 0, pages_4k = 0; |
1da177e4 | 199 | |
a04ad82d YL |
200 | if (!cpu_has_pse) |
201 | use_pse = 0; | |
1da177e4 | 202 | |
a04ad82d YL |
203 | pfn = start_pfn; |
204 | pgd_idx = pgd_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET); | |
205 | pgd = pgd_base + pgd_idx; | |
1da177e4 LT |
206 | for (; pgd_idx < PTRS_PER_PGD; pgd++, pgd_idx++) { |
207 | pmd = one_md_table_init(pgd); | |
8550eb99 | 208 | |
a04ad82d YL |
209 | if (pfn >= end_pfn) |
210 | continue; | |
211 | #ifdef CONFIG_X86_PAE | |
212 | pmd_idx = pmd_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET); | |
213 | pmd += pmd_idx; | |
214 | #else | |
215 | pmd_idx = 0; | |
216 | #endif | |
217 | for (; pmd_idx < PTRS_PER_PMD && pfn < end_pfn; | |
f3f20de8 | 218 | pmd++, pmd_idx++) { |
8550eb99 | 219 | unsigned int addr = pfn * PAGE_SIZE + PAGE_OFFSET; |
1da177e4 | 220 | |
8550eb99 IM |
221 | /* |
222 | * Map with big pages if possible, otherwise | |
223 | * create normal page tables: | |
224 | */ | |
a04ad82d | 225 | if (use_pse) { |
8550eb99 | 226 | unsigned int addr2; |
f3f20de8 JF |
227 | pgprot_t prot = PAGE_KERNEL_LARGE; |
228 | ||
8550eb99 | 229 | addr2 = (pfn + PTRS_PER_PTE-1) * PAGE_SIZE + |
f3f20de8 JF |
230 | PAGE_OFFSET + PAGE_SIZE-1; |
231 | ||
8550eb99 IM |
232 | if (is_kernel_text(addr) || |
233 | is_kernel_text(addr2)) | |
f3f20de8 JF |
234 | prot = PAGE_KERNEL_LARGE_EXEC; |
235 | ||
ce0c0e50 | 236 | pages_2m++; |
f3f20de8 | 237 | set_pmd(pmd, pfn_pmd(pfn, prot)); |
b239fb25 | 238 | |
1da177e4 | 239 | pfn += PTRS_PER_PTE; |
8550eb99 IM |
240 | continue; |
241 | } | |
242 | pte = one_page_table_init(pmd); | |
1da177e4 | 243 | |
a04ad82d YL |
244 | pte_ofs = pte_index((pfn<<PAGE_SHIFT) + PAGE_OFFSET); |
245 | pte += pte_ofs; | |
246 | for (; pte_ofs < PTRS_PER_PTE && pfn < end_pfn; | |
8550eb99 IM |
247 | pte++, pfn++, pte_ofs++, addr += PAGE_SIZE) { |
248 | pgprot_t prot = PAGE_KERNEL; | |
f3f20de8 | 249 | |
8550eb99 IM |
250 | if (is_kernel_text(addr)) |
251 | prot = PAGE_KERNEL_EXEC; | |
f3f20de8 | 252 | |
ce0c0e50 | 253 | pages_4k++; |
8550eb99 | 254 | set_pte(pte, pfn_pte(pfn, prot)); |
1da177e4 LT |
255 | } |
256 | } | |
257 | } | |
ce0c0e50 AK |
258 | update_page_count(PG_LEVEL_2M, pages_2m); |
259 | update_page_count(PG_LEVEL_4K, pages_4k); | |
1da177e4 LT |
260 | } |
261 | ||
ae531c26 AV |
262 | /* |
263 | * devmem_is_allowed() checks to see if /dev/mem access to a certain address | |
264 | * is valid. The argument is a physical page number. | |
265 | * | |
266 | * | |
267 | * On x86, access has to be given to the first megabyte of ram because that area | |
268 | * contains bios code and data regions used by X and dosemu and similar apps. | |
269 | * Access has to be given to non-kernel-ram areas as well, these contain the PCI | |
270 | * mmio resources as well as potential bios/acpi data regions. | |
271 | */ | |
272 | int devmem_is_allowed(unsigned long pagenr) | |
273 | { | |
274 | if (pagenr <= 256) | |
275 | return 1; | |
276 | if (!page_is_ram(pagenr)) | |
277 | return 1; | |
278 | return 0; | |
279 | } | |
280 | ||
1da177e4 LT |
281 | #ifdef CONFIG_HIGHMEM |
282 | pte_t *kmap_pte; | |
283 | pgprot_t kmap_prot; | |
284 | ||
8550eb99 IM |
285 | static inline pte_t *kmap_get_fixmap_pte(unsigned long vaddr) |
286 | { | |
287 | return pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), | |
288 | vaddr), vaddr), vaddr); | |
289 | } | |
1da177e4 LT |
290 | |
291 | static void __init kmap_init(void) | |
292 | { | |
293 | unsigned long kmap_vstart; | |
294 | ||
8550eb99 IM |
295 | /* |
296 | * Cache the first kmap pte: | |
297 | */ | |
1da177e4 LT |
298 | kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN); |
299 | kmap_pte = kmap_get_fixmap_pte(kmap_vstart); | |
300 | ||
301 | kmap_prot = PAGE_KERNEL; | |
302 | } | |
303 | ||
304 | static void __init permanent_kmaps_init(pgd_t *pgd_base) | |
305 | { | |
8550eb99 | 306 | unsigned long vaddr; |
1da177e4 LT |
307 | pgd_t *pgd; |
308 | pud_t *pud; | |
309 | pmd_t *pmd; | |
310 | pte_t *pte; | |
1da177e4 LT |
311 | |
312 | vaddr = PKMAP_BASE; | |
313 | page_table_range_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base); | |
314 | ||
315 | pgd = swapper_pg_dir + pgd_index(vaddr); | |
316 | pud = pud_offset(pgd, vaddr); | |
317 | pmd = pmd_offset(pud, vaddr); | |
318 | pte = pte_offset_kernel(pmd, vaddr); | |
8550eb99 | 319 | pkmap_page_table = pte; |
1da177e4 LT |
320 | } |
321 | ||
cc9f7a0c | 322 | static void __init add_one_highpage_init(struct page *page, int pfn) |
1da177e4 | 323 | { |
cc9f7a0c YL |
324 | ClearPageReserved(page); |
325 | init_page_count(page); | |
326 | __free_page(page); | |
327 | totalhigh_pages++; | |
1da177e4 LT |
328 | } |
329 | ||
b5bc6c0e YL |
330 | struct add_highpages_data { |
331 | unsigned long start_pfn; | |
332 | unsigned long end_pfn; | |
b5bc6c0e YL |
333 | }; |
334 | ||
d52d53b8 | 335 | static int __init add_highpages_work_fn(unsigned long start_pfn, |
b5bc6c0e | 336 | unsigned long end_pfn, void *datax) |
1da177e4 | 337 | { |
b5bc6c0e YL |
338 | int node_pfn; |
339 | struct page *page; | |
340 | unsigned long final_start_pfn, final_end_pfn; | |
341 | struct add_highpages_data *data; | |
8550eb99 | 342 | |
b5bc6c0e | 343 | data = (struct add_highpages_data *)datax; |
b5bc6c0e YL |
344 | |
345 | final_start_pfn = max(start_pfn, data->start_pfn); | |
346 | final_end_pfn = min(end_pfn, data->end_pfn); | |
347 | if (final_start_pfn >= final_end_pfn) | |
d52d53b8 | 348 | return 0; |
b5bc6c0e YL |
349 | |
350 | for (node_pfn = final_start_pfn; node_pfn < final_end_pfn; | |
351 | node_pfn++) { | |
352 | if (!pfn_valid(node_pfn)) | |
353 | continue; | |
354 | page = pfn_to_page(node_pfn); | |
cc9f7a0c | 355 | add_one_highpage_init(page, node_pfn); |
23be8c7d | 356 | } |
b5bc6c0e | 357 | |
d52d53b8 YL |
358 | return 0; |
359 | ||
b5bc6c0e YL |
360 | } |
361 | ||
362 | void __init add_highpages_with_active_regions(int nid, unsigned long start_pfn, | |
cc9f7a0c | 363 | unsigned long end_pfn) |
b5bc6c0e YL |
364 | { |
365 | struct add_highpages_data data; | |
366 | ||
367 | data.start_pfn = start_pfn; | |
368 | data.end_pfn = end_pfn; | |
b5bc6c0e YL |
369 | |
370 | work_with_active_regions(nid, add_highpages_work_fn, &data); | |
371 | } | |
372 | ||
8550eb99 | 373 | #ifndef CONFIG_NUMA |
cc9f7a0c | 374 | static void __init set_highmem_pages_init(void) |
1da177e4 | 375 | { |
cc9f7a0c | 376 | add_highpages_with_active_regions(0, highstart_pfn, highend_pfn); |
b5bc6c0e | 377 | |
1da177e4 LT |
378 | totalram_pages += totalhigh_pages; |
379 | } | |
8550eb99 | 380 | #endif /* !CONFIG_NUMA */ |
1da177e4 LT |
381 | |
382 | #else | |
8550eb99 IM |
383 | # define kmap_init() do { } while (0) |
384 | # define permanent_kmaps_init(pgd_base) do { } while (0) | |
cc9f7a0c | 385 | # define set_highmem_pages_init() do { } while (0) |
1da177e4 LT |
386 | #endif /* CONFIG_HIGHMEM */ |
387 | ||
b239fb25 | 388 | void __init native_pagetable_setup_start(pgd_t *base) |
1da177e4 | 389 | { |
551889a6 IC |
390 | unsigned long pfn, va; |
391 | pgd_t *pgd; | |
392 | pud_t *pud; | |
393 | pmd_t *pmd; | |
394 | pte_t *pte; | |
b239fb25 JF |
395 | |
396 | /* | |
551889a6 IC |
397 | * Remove any mappings which extend past the end of physical |
398 | * memory from the boot time page table: | |
b239fb25 | 399 | */ |
551889a6 IC |
400 | for (pfn = max_low_pfn + 1; pfn < 1<<(32-PAGE_SHIFT); pfn++) { |
401 | va = PAGE_OFFSET + (pfn<<PAGE_SHIFT); | |
402 | pgd = base + pgd_index(va); | |
403 | if (!pgd_present(*pgd)) | |
404 | break; | |
405 | ||
406 | pud = pud_offset(pgd, va); | |
407 | pmd = pmd_offset(pud, va); | |
408 | if (!pmd_present(*pmd)) | |
409 | break; | |
410 | ||
411 | pte = pte_offset_kernel(pmd, va); | |
412 | if (!pte_present(*pte)) | |
413 | break; | |
414 | ||
415 | pte_clear(NULL, va, pte); | |
416 | } | |
6944a9c8 | 417 | paravirt_alloc_pmd(&init_mm, __pa(base) >> PAGE_SHIFT); |
b239fb25 JF |
418 | } |
419 | ||
420 | void __init native_pagetable_setup_done(pgd_t *base) | |
421 | { | |
b239fb25 JF |
422 | } |
423 | ||
424 | /* | |
425 | * Build a proper pagetable for the kernel mappings. Up until this | |
426 | * point, we've been running on some set of pagetables constructed by | |
427 | * the boot process. | |
428 | * | |
429 | * If we're booting on native hardware, this will be a pagetable | |
551889a6 IC |
430 | * constructed in arch/x86/kernel/head_32.S. The root of the |
431 | * pagetable will be swapper_pg_dir. | |
b239fb25 JF |
432 | * |
433 | * If we're booting paravirtualized under a hypervisor, then there are | |
434 | * more options: we may already be running PAE, and the pagetable may | |
435 | * or may not be based in swapper_pg_dir. In any case, | |
436 | * paravirt_pagetable_setup_start() will set up swapper_pg_dir | |
437 | * appropriately for the rest of the initialization to work. | |
438 | * | |
439 | * In general, pagetable_init() assumes that the pagetable may already | |
440 | * be partially populated, and so it avoids stomping on any existing | |
441 | * mappings. | |
442 | */ | |
e7b37895 | 443 | static void __init early_ioremap_page_table_range_init(pgd_t *pgd_base) |
b239fb25 | 444 | { |
8550eb99 | 445 | unsigned long vaddr, end; |
b239fb25 | 446 | |
1da177e4 LT |
447 | /* |
448 | * Fixed mappings, only the page table structure has to be | |
449 | * created - mappings will be set by set_fixmap(): | |
450 | */ | |
beacfaac | 451 | early_ioremap_clear(); |
1da177e4 | 452 | vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK; |
b239fb25 JF |
453 | end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK; |
454 | page_table_range_init(vaddr, end, pgd_base); | |
beacfaac | 455 | early_ioremap_reset(); |
e7b37895 YL |
456 | } |
457 | ||
458 | static void __init pagetable_init(void) | |
459 | { | |
460 | pgd_t *pgd_base = swapper_pg_dir; | |
461 | ||
1da177e4 | 462 | permanent_kmaps_init(pgd_base); |
1da177e4 LT |
463 | } |
464 | ||
a6eb84bc | 465 | #ifdef CONFIG_ACPI_SLEEP |
1da177e4 | 466 | /* |
a6eb84bc | 467 | * ACPI suspend needs this for resume, because things like the intel-agp |
1da177e4 LT |
468 | * driver might have split up a kernel 4MB mapping. |
469 | */ | |
a6eb84bc | 470 | char swsusp_pg_dir[PAGE_SIZE] |
8550eb99 | 471 | __attribute__ ((aligned(PAGE_SIZE))); |
1da177e4 LT |
472 | |
473 | static inline void save_pg_dir(void) | |
474 | { | |
475 | memcpy(swsusp_pg_dir, swapper_pg_dir, PAGE_SIZE); | |
476 | } | |
a6eb84bc | 477 | #else /* !CONFIG_ACPI_SLEEP */ |
1da177e4 LT |
478 | static inline void save_pg_dir(void) |
479 | { | |
480 | } | |
a6eb84bc | 481 | #endif /* !CONFIG_ACPI_SLEEP */ |
1da177e4 | 482 | |
8550eb99 | 483 | void zap_low_mappings(void) |
1da177e4 LT |
484 | { |
485 | int i; | |
486 | ||
1da177e4 LT |
487 | /* |
488 | * Zap initial low-memory mappings. | |
489 | * | |
490 | * Note that "pgd_clear()" doesn't do it for | |
491 | * us, because pgd_clear() is a no-op on i386. | |
492 | */ | |
68db065c | 493 | for (i = 0; i < KERNEL_PGD_BOUNDARY; i++) { |
1da177e4 LT |
494 | #ifdef CONFIG_X86_PAE |
495 | set_pgd(swapper_pg_dir+i, __pgd(1 + __pa(empty_zero_page))); | |
496 | #else | |
497 | set_pgd(swapper_pg_dir+i, __pgd(0)); | |
498 | #endif | |
8550eb99 | 499 | } |
1da177e4 LT |
500 | flush_tlb_all(); |
501 | } | |
502 | ||
8550eb99 | 503 | int nx_enabled; |
d5321abe | 504 | |
ef5e94af | 505 | pteval_t __supported_pte_mask __read_mostly = ~(_PAGE_NX | _PAGE_GLOBAL); |
6fdc05d4 JF |
506 | EXPORT_SYMBOL_GPL(__supported_pte_mask); |
507 | ||
d5321abe JB |
508 | #ifdef CONFIG_X86_PAE |
509 | ||
8550eb99 | 510 | static int disable_nx __initdata; |
1da177e4 LT |
511 | |
512 | /* | |
513 | * noexec = on|off | |
514 | * | |
515 | * Control non executable mappings. | |
516 | * | |
517 | * on Enable | |
518 | * off Disable | |
519 | */ | |
1a3f239d | 520 | static int __init noexec_setup(char *str) |
1da177e4 | 521 | { |
1a3f239d RR |
522 | if (!str || !strcmp(str, "on")) { |
523 | if (cpu_has_nx) { | |
524 | __supported_pte_mask |= _PAGE_NX; | |
525 | disable_nx = 0; | |
526 | } | |
8550eb99 IM |
527 | } else { |
528 | if (!strcmp(str, "off")) { | |
529 | disable_nx = 1; | |
530 | __supported_pte_mask &= ~_PAGE_NX; | |
531 | } else { | |
532 | return -EINVAL; | |
533 | } | |
534 | } | |
1a3f239d RR |
535 | |
536 | return 0; | |
1da177e4 | 537 | } |
1a3f239d | 538 | early_param("noexec", noexec_setup); |
1da177e4 | 539 | |
1da177e4 LT |
540 | static void __init set_nx(void) |
541 | { | |
542 | unsigned int v[4], l, h; | |
543 | ||
544 | if (cpu_has_pae && (cpuid_eax(0x80000000) > 0x80000001)) { | |
545 | cpuid(0x80000001, &v[0], &v[1], &v[2], &v[3]); | |
8550eb99 | 546 | |
1da177e4 LT |
547 | if ((v[3] & (1 << 20)) && !disable_nx) { |
548 | rdmsr(MSR_EFER, l, h); | |
549 | l |= EFER_NX; | |
550 | wrmsr(MSR_EFER, l, h); | |
551 | nx_enabled = 1; | |
552 | __supported_pte_mask |= _PAGE_NX; | |
553 | } | |
554 | } | |
555 | } | |
1da177e4 LT |
556 | #endif |
557 | ||
90d967e0 YL |
558 | /* user-defined highmem size */ |
559 | static unsigned int highmem_pages = -1; | |
560 | ||
561 | /* | |
562 | * highmem=size forces highmem to be exactly 'size' bytes. | |
563 | * This works even on boxes that have no highmem otherwise. | |
564 | * This also works to reduce highmem size on bigger boxes. | |
565 | */ | |
566 | static int __init parse_highmem(char *arg) | |
567 | { | |
568 | if (!arg) | |
569 | return -EINVAL; | |
570 | ||
571 | highmem_pages = memparse(arg, &arg) >> PAGE_SHIFT; | |
572 | return 0; | |
573 | } | |
574 | early_param("highmem", parse_highmem); | |
575 | ||
576 | /* | |
577 | * Determine low and high memory ranges: | |
578 | */ | |
2ec65f8b | 579 | void __init find_low_pfn_range(void) |
90d967e0 | 580 | { |
2ec65f8b YL |
581 | /* it could update max_pfn */ |
582 | ||
346cafec | 583 | /* max_low_pfn is 0, we already have early_res support */ |
90d967e0 YL |
584 | |
585 | max_low_pfn = max_pfn; | |
586 | if (max_low_pfn > MAXMEM_PFN) { | |
587 | if (highmem_pages == -1) | |
588 | highmem_pages = max_pfn - MAXMEM_PFN; | |
589 | if (highmem_pages + MAXMEM_PFN < max_pfn) | |
590 | max_pfn = MAXMEM_PFN + highmem_pages; | |
591 | if (highmem_pages + MAXMEM_PFN > max_pfn) { | |
592 | printk(KERN_WARNING "only %luMB highmem pages " | |
593 | "available, ignoring highmem size of %uMB.\n", | |
594 | pages_to_mb(max_pfn - MAXMEM_PFN), | |
595 | pages_to_mb(highmem_pages)); | |
596 | highmem_pages = 0; | |
597 | } | |
598 | max_low_pfn = MAXMEM_PFN; | |
599 | #ifndef CONFIG_HIGHMEM | |
600 | /* Maximum memory usable is what is directly addressable */ | |
601 | printk(KERN_WARNING "Warning only %ldMB will be used.\n", | |
602 | MAXMEM>>20); | |
603 | if (max_pfn > MAX_NONPAE_PFN) | |
604 | printk(KERN_WARNING | |
605 | "Use a HIGHMEM64G enabled kernel.\n"); | |
606 | else | |
607 | printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n"); | |
608 | max_pfn = MAXMEM_PFN; | |
609 | #else /* !CONFIG_HIGHMEM */ | |
610 | #ifndef CONFIG_HIGHMEM64G | |
611 | if (max_pfn > MAX_NONPAE_PFN) { | |
612 | max_pfn = MAX_NONPAE_PFN; | |
613 | printk(KERN_WARNING "Warning only 4GB will be used." | |
614 | "Use a HIGHMEM64G enabled kernel.\n"); | |
615 | } | |
616 | #endif /* !CONFIG_HIGHMEM64G */ | |
617 | #endif /* !CONFIG_HIGHMEM */ | |
618 | } else { | |
619 | if (highmem_pages == -1) | |
620 | highmem_pages = 0; | |
621 | #ifdef CONFIG_HIGHMEM | |
622 | if (highmem_pages >= max_pfn) { | |
623 | printk(KERN_ERR "highmem size specified (%uMB) is " | |
624 | "bigger than pages available (%luMB)!.\n", | |
625 | pages_to_mb(highmem_pages), | |
626 | pages_to_mb(max_pfn)); | |
627 | highmem_pages = 0; | |
628 | } | |
629 | if (highmem_pages) { | |
630 | if (max_low_pfn - highmem_pages < | |
631 | 64*1024*1024/PAGE_SIZE){ | |
632 | printk(KERN_ERR "highmem size %uMB results in " | |
633 | "smaller than 64MB lowmem, ignoring it.\n" | |
634 | , pages_to_mb(highmem_pages)); | |
635 | highmem_pages = 0; | |
636 | } | |
637 | max_low_pfn -= highmem_pages; | |
638 | } | |
639 | #else | |
640 | if (highmem_pages) | |
641 | printk(KERN_ERR "ignoring highmem size on non-highmem" | |
642 | " kernel!\n"); | |
643 | #endif | |
644 | } | |
90d967e0 YL |
645 | } |
646 | ||
b2ac82a0 | 647 | #ifndef CONFIG_NEED_MULTIPLE_NODES |
2ec65f8b | 648 | void __init initmem_init(unsigned long start_pfn, |
b2ac82a0 YL |
649 | unsigned long end_pfn) |
650 | { | |
b2ac82a0 YL |
651 | #ifdef CONFIG_HIGHMEM |
652 | highstart_pfn = highend_pfn = max_pfn; | |
653 | if (max_pfn > max_low_pfn) | |
654 | highstart_pfn = max_low_pfn; | |
655 | memory_present(0, 0, highend_pfn); | |
cb95a13a | 656 | e820_register_active_regions(0, 0, highend_pfn); |
b2ac82a0 YL |
657 | printk(KERN_NOTICE "%ldMB HIGHMEM available.\n", |
658 | pages_to_mb(highend_pfn - highstart_pfn)); | |
659 | num_physpages = highend_pfn; | |
660 | high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1; | |
661 | #else | |
662 | memory_present(0, 0, max_low_pfn); | |
cb95a13a | 663 | e820_register_active_regions(0, 0, max_low_pfn); |
b2ac82a0 YL |
664 | num_physpages = max_low_pfn; |
665 | high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1; | |
666 | #endif | |
667 | #ifdef CONFIG_FLATMEM | |
668 | max_mapnr = num_physpages; | |
669 | #endif | |
670 | printk(KERN_NOTICE "%ldMB LOWMEM available.\n", | |
671 | pages_to_mb(max_low_pfn)); | |
672 | ||
673 | setup_bootmem_allocator(); | |
b2ac82a0 | 674 | } |
cb95a13a | 675 | #endif /* !CONFIG_NEED_MULTIPLE_NODES */ |
b2ac82a0 | 676 | |
cb95a13a | 677 | static void __init zone_sizes_init(void) |
b2ac82a0 YL |
678 | { |
679 | unsigned long max_zone_pfns[MAX_NR_ZONES]; | |
680 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); | |
681 | max_zone_pfns[ZONE_DMA] = | |
682 | virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT; | |
683 | max_zone_pfns[ZONE_NORMAL] = max_low_pfn; | |
b2ac82a0 YL |
684 | #ifdef CONFIG_HIGHMEM |
685 | max_zone_pfns[ZONE_HIGHMEM] = highend_pfn; | |
b2ac82a0 YL |
686 | #endif |
687 | ||
688 | free_area_init_nodes(max_zone_pfns); | |
689 | } | |
b2ac82a0 | 690 | |
b2ac82a0 YL |
691 | void __init setup_bootmem_allocator(void) |
692 | { | |
693 | int i; | |
694 | unsigned long bootmap_size, bootmap; | |
695 | /* | |
696 | * Initialize the boot-time allocator (with low memory only): | |
697 | */ | |
698 | bootmap_size = bootmem_bootmap_pages(max_low_pfn)<<PAGE_SHIFT; | |
699 | bootmap = find_e820_area(min_low_pfn<<PAGE_SHIFT, | |
700 | max_pfn_mapped<<PAGE_SHIFT, bootmap_size, | |
701 | PAGE_SIZE); | |
702 | if (bootmap == -1L) | |
703 | panic("Cannot find bootmem map of size %ld\n", bootmap_size); | |
704 | reserve_early(bootmap, bootmap + bootmap_size, "BOOTMAP"); | |
225c37d7 | 705 | |
346cafec YL |
706 | /* don't touch min_low_pfn */ |
707 | bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap >> PAGE_SHIFT, | |
708 | min_low_pfn, max_low_pfn); | |
b2ac82a0 YL |
709 | printk(KERN_INFO " mapped low ram: 0 - %08lx\n", |
710 | max_pfn_mapped<<PAGE_SHIFT); | |
711 | printk(KERN_INFO " low ram: %08lx - %08lx\n", | |
712 | min_low_pfn<<PAGE_SHIFT, max_low_pfn<<PAGE_SHIFT); | |
713 | printk(KERN_INFO " bootmap %08lx - %08lx\n", | |
714 | bootmap, bootmap + bootmap_size); | |
715 | for_each_online_node(i) | |
716 | free_bootmem_with_active_regions(i, max_low_pfn); | |
717 | early_res_to_bootmem(0, max_low_pfn<<PAGE_SHIFT); | |
718 | ||
4e29684c | 719 | after_init_bootmem = 1; |
b2ac82a0 YL |
720 | } |
721 | ||
4e29684c YL |
722 | static void __init find_early_table_space(unsigned long end) |
723 | { | |
7482b0e9 | 724 | unsigned long puds, pmds, ptes, tables, start; |
4e29684c YL |
725 | |
726 | puds = (end + PUD_SIZE - 1) >> PUD_SHIFT; | |
727 | tables = PAGE_ALIGN(puds * sizeof(pud_t)); | |
728 | ||
729 | pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT; | |
730 | tables += PAGE_ALIGN(pmds * sizeof(pmd_t)); | |
731 | ||
7482b0e9 YL |
732 | if (cpu_has_pse) { |
733 | unsigned long extra; | |
a04ad82d YL |
734 | |
735 | extra = end - ((end>>PMD_SHIFT) << PMD_SHIFT); | |
736 | extra += PMD_SIZE; | |
7482b0e9 YL |
737 | ptes = (extra + PAGE_SIZE - 1) >> PAGE_SHIFT; |
738 | } else | |
739 | ptes = (end + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
740 | ||
741 | tables += PAGE_ALIGN(ptes * sizeof(pte_t)); | |
8207c257 | 742 | |
a04ad82d YL |
743 | /* for fixmap */ |
744 | tables += PAGE_SIZE * 2; | |
745 | ||
4e29684c YL |
746 | /* |
747 | * RED-PEN putting page tables only on node 0 could | |
748 | * cause a hotspot and fill up ZONE_DMA. The page tables | |
749 | * need roughly 0.5KB per GB. | |
750 | */ | |
751 | start = 0x7000; | |
752 | table_start = find_e820_area(start, max_pfn_mapped<<PAGE_SHIFT, | |
753 | tables, PAGE_SIZE); | |
754 | if (table_start == -1UL) | |
755 | panic("Cannot find space for the kernel page tables"); | |
756 | ||
757 | table_start >>= PAGE_SHIFT; | |
758 | table_end = table_start; | |
759 | table_top = table_start + (tables>>PAGE_SHIFT); | |
760 | ||
761 | printk(KERN_DEBUG "kernel direct mapping tables up to %lx @ %lx-%lx\n", | |
762 | end, table_start << PAGE_SHIFT, | |
763 | (table_start << PAGE_SHIFT) + tables); | |
764 | } | |
765 | ||
766 | unsigned long __init_refok init_memory_mapping(unsigned long start, | |
767 | unsigned long end) | |
768 | { | |
769 | pgd_t *pgd_base = swapper_pg_dir; | |
a04ad82d YL |
770 | unsigned long start_pfn, end_pfn; |
771 | unsigned long big_page_start; | |
4e29684c YL |
772 | |
773 | /* | |
774 | * Find space for the kernel direct mapping tables. | |
775 | */ | |
776 | if (!after_init_bootmem) | |
777 | find_early_table_space(end); | |
778 | ||
779 | #ifdef CONFIG_X86_PAE | |
780 | set_nx(); | |
781 | if (nx_enabled) | |
782 | printk(KERN_INFO "NX (Execute Disable) protection: active\n"); | |
783 | #endif | |
784 | ||
785 | /* Enable PSE if available */ | |
786 | if (cpu_has_pse) | |
787 | set_in_cr4(X86_CR4_PSE); | |
788 | ||
789 | /* Enable PGE if available */ | |
790 | if (cpu_has_pge) { | |
791 | set_in_cr4(X86_CR4_PGE); | |
ef5e94af | 792 | __supported_pte_mask |= _PAGE_GLOBAL; |
4e29684c YL |
793 | } |
794 | ||
a04ad82d YL |
795 | /* |
796 | * Don't use a large page for the first 2/4MB of memory | |
797 | * because there are often fixed size MTRRs in there | |
798 | * and overlapping MTRRs into large pages can cause | |
799 | * slowdowns. | |
800 | */ | |
801 | big_page_start = PMD_SIZE; | |
802 | ||
803 | if (start < big_page_start) { | |
804 | start_pfn = start >> PAGE_SHIFT; | |
805 | end_pfn = min(big_page_start>>PAGE_SHIFT, end>>PAGE_SHIFT); | |
806 | } else { | |
807 | /* head is not big page alignment ? */ | |
808 | start_pfn = start >> PAGE_SHIFT; | |
809 | end_pfn = ((start + (PMD_SIZE - 1))>>PMD_SHIFT) | |
810 | << (PMD_SHIFT - PAGE_SHIFT); | |
811 | } | |
812 | if (start_pfn < end_pfn) | |
813 | kernel_physical_mapping_init(pgd_base, start_pfn, end_pfn, 0); | |
814 | ||
815 | /* big page range */ | |
816 | start_pfn = ((start + (PMD_SIZE - 1))>>PMD_SHIFT) | |
817 | << (PMD_SHIFT - PAGE_SHIFT); | |
818 | if (start_pfn < (big_page_start >> PAGE_SHIFT)) | |
819 | start_pfn = big_page_start >> PAGE_SHIFT; | |
820 | end_pfn = (end>>PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT); | |
821 | if (start_pfn < end_pfn) | |
822 | kernel_physical_mapping_init(pgd_base, start_pfn, end_pfn, | |
823 | cpu_has_pse); | |
824 | ||
825 | /* tail is not big page alignment ? */ | |
826 | start_pfn = end_pfn; | |
827 | if (start_pfn > (big_page_start>>PAGE_SHIFT)) { | |
828 | end_pfn = end >> PAGE_SHIFT; | |
829 | if (start_pfn < end_pfn) | |
830 | kernel_physical_mapping_init(pgd_base, start_pfn, | |
831 | end_pfn, 0); | |
832 | } | |
4e29684c | 833 | |
e7b37895 YL |
834 | early_ioremap_page_table_range_init(pgd_base); |
835 | ||
4e29684c YL |
836 | load_cr3(swapper_pg_dir); |
837 | ||
838 | __flush_tlb_all(); | |
839 | ||
840 | if (!after_init_bootmem) | |
841 | reserve_early(table_start << PAGE_SHIFT, | |
842 | table_end << PAGE_SHIFT, "PGTABLE"); | |
843 | ||
caadbdce YL |
844 | if (!after_init_bootmem) |
845 | early_memtest(start, end); | |
846 | ||
4e29684c YL |
847 | return end >> PAGE_SHIFT; |
848 | } | |
849 | ||
e7b37895 | 850 | |
1da177e4 LT |
851 | /* |
852 | * paging_init() sets up the page tables - note that the first 8MB are | |
853 | * already mapped by head.S. | |
854 | * | |
855 | * This routines also unmaps the page at virtual kernel address 0, so | |
856 | * that we can trap those pesky NULL-reference errors in the kernel. | |
857 | */ | |
858 | void __init paging_init(void) | |
859 | { | |
1da177e4 LT |
860 | pagetable_init(); |
861 | ||
1da177e4 LT |
862 | __flush_tlb_all(); |
863 | ||
864 | kmap_init(); | |
11cd0bc1 YL |
865 | |
866 | /* | |
867 | * NOTE: at this point the bootmem allocator is fully available. | |
868 | */ | |
11cd0bc1 YL |
869 | sparse_init(); |
870 | zone_sizes_init(); | |
1da177e4 LT |
871 | } |
872 | ||
873 | /* | |
874 | * Test if the WP bit works in supervisor mode. It isn't supported on 386's | |
f7f17a67 DV |
875 | * and also on some strange 486's. All 586+'s are OK. This used to involve |
876 | * black magic jumps to work around some nasty CPU bugs, but fortunately the | |
877 | * switch to using exceptions got rid of all that. | |
1da177e4 | 878 | */ |
1da177e4 LT |
879 | static void __init test_wp_bit(void) |
880 | { | |
d7d119d7 IM |
881 | printk(KERN_INFO |
882 | "Checking if this processor honours the WP bit even in supervisor mode..."); | |
1da177e4 LT |
883 | |
884 | /* Any page-aligned address will do, the test is non-destructive */ | |
885 | __set_fixmap(FIX_WP_TEST, __pa(&swapper_pg_dir), PAGE_READONLY); | |
886 | boot_cpu_data.wp_works_ok = do_test_wp_bit(); | |
887 | clear_fixmap(FIX_WP_TEST); | |
888 | ||
889 | if (!boot_cpu_data.wp_works_ok) { | |
d7d119d7 | 890 | printk(KERN_CONT "No.\n"); |
1da177e4 | 891 | #ifdef CONFIG_X86_WP_WORKS_OK |
d7d119d7 IM |
892 | panic( |
893 | "This kernel doesn't support CPU's with broken WP. Recompile it for a 386!"); | |
1da177e4 LT |
894 | #endif |
895 | } else { | |
d7d119d7 | 896 | printk(KERN_CONT "Ok.\n"); |
1da177e4 LT |
897 | } |
898 | } | |
899 | ||
8550eb99 | 900 | static struct kcore_list kcore_mem, kcore_vmalloc; |
1da177e4 LT |
901 | |
902 | void __init mem_init(void) | |
903 | { | |
1da177e4 | 904 | int codesize, reservedpages, datasize, initsize; |
cc9f7a0c | 905 | int tmp; |
1da177e4 | 906 | |
05b79bdc | 907 | #ifdef CONFIG_FLATMEM |
8d8f3cbe | 908 | BUG_ON(!mem_map); |
1da177e4 | 909 | #endif |
1da177e4 LT |
910 | /* this will put all low memory onto the freelists */ |
911 | totalram_pages += free_all_bootmem(); | |
912 | ||
913 | reservedpages = 0; | |
914 | for (tmp = 0; tmp < max_low_pfn; tmp++) | |
915 | /* | |
8550eb99 | 916 | * Only count reserved RAM pages: |
1da177e4 LT |
917 | */ |
918 | if (page_is_ram(tmp) && PageReserved(pfn_to_page(tmp))) | |
919 | reservedpages++; | |
920 | ||
cc9f7a0c | 921 | set_highmem_pages_init(); |
1da177e4 LT |
922 | |
923 | codesize = (unsigned long) &_etext - (unsigned long) &_text; | |
924 | datasize = (unsigned long) &_edata - (unsigned long) &_etext; | |
925 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; | |
926 | ||
8550eb99 IM |
927 | kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT); |
928 | kclist_add(&kcore_vmalloc, (void *)VMALLOC_START, | |
1da177e4 LT |
929 | VMALLOC_END-VMALLOC_START); |
930 | ||
8550eb99 IM |
931 | printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, " |
932 | "%dk reserved, %dk data, %dk init, %ldk highmem)\n", | |
1da177e4 LT |
933 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), |
934 | num_physpages << (PAGE_SHIFT-10), | |
935 | codesize >> 10, | |
936 | reservedpages << (PAGE_SHIFT-10), | |
937 | datasize >> 10, | |
938 | initsize >> 10, | |
939 | (unsigned long) (totalhigh_pages << (PAGE_SHIFT-10)) | |
940 | ); | |
941 | ||
d7d119d7 | 942 | printk(KERN_INFO "virtual kernel memory layout:\n" |
8550eb99 | 943 | " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" |
052e7994 | 944 | #ifdef CONFIG_HIGHMEM |
8550eb99 | 945 | " pkmap : 0x%08lx - 0x%08lx (%4ld kB)\n" |
052e7994 | 946 | #endif |
8550eb99 IM |
947 | " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" |
948 | " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" | |
949 | " .init : 0x%08lx - 0x%08lx (%4ld kB)\n" | |
950 | " .data : 0x%08lx - 0x%08lx (%4ld kB)\n" | |
951 | " .text : 0x%08lx - 0x%08lx (%4ld kB)\n", | |
952 | FIXADDR_START, FIXADDR_TOP, | |
953 | (FIXADDR_TOP - FIXADDR_START) >> 10, | |
052e7994 JF |
954 | |
955 | #ifdef CONFIG_HIGHMEM | |
8550eb99 IM |
956 | PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE, |
957 | (LAST_PKMAP*PAGE_SIZE) >> 10, | |
052e7994 JF |
958 | #endif |
959 | ||
8550eb99 IM |
960 | VMALLOC_START, VMALLOC_END, |
961 | (VMALLOC_END - VMALLOC_START) >> 20, | |
052e7994 | 962 | |
8550eb99 IM |
963 | (unsigned long)__va(0), (unsigned long)high_memory, |
964 | ((unsigned long)high_memory - (unsigned long)__va(0)) >> 20, | |
052e7994 | 965 | |
8550eb99 IM |
966 | (unsigned long)&__init_begin, (unsigned long)&__init_end, |
967 | ((unsigned long)&__init_end - | |
968 | (unsigned long)&__init_begin) >> 10, | |
052e7994 | 969 | |
8550eb99 IM |
970 | (unsigned long)&_etext, (unsigned long)&_edata, |
971 | ((unsigned long)&_edata - (unsigned long)&_etext) >> 10, | |
052e7994 | 972 | |
8550eb99 IM |
973 | (unsigned long)&_text, (unsigned long)&_etext, |
974 | ((unsigned long)&_etext - (unsigned long)&_text) >> 10); | |
052e7994 JF |
975 | |
976 | #ifdef CONFIG_HIGHMEM | |
8550eb99 IM |
977 | BUG_ON(PKMAP_BASE + LAST_PKMAP*PAGE_SIZE > FIXADDR_START); |
978 | BUG_ON(VMALLOC_END > PKMAP_BASE); | |
052e7994 | 979 | #endif |
8550eb99 IM |
980 | BUG_ON(VMALLOC_START > VMALLOC_END); |
981 | BUG_ON((unsigned long)high_memory > VMALLOC_START); | |
052e7994 | 982 | |
1da177e4 LT |
983 | if (boot_cpu_data.wp_works_ok < 0) |
984 | test_wp_bit(); | |
985 | ||
76ebd054 | 986 | cpa_init(); |
61165d7a | 987 | save_pg_dir(); |
1da177e4 | 988 | zap_low_mappings(); |
1da177e4 LT |
989 | } |
990 | ||
ad8f5797 | 991 | #ifdef CONFIG_MEMORY_HOTPLUG |
bc02af93 | 992 | int arch_add_memory(int nid, u64 start, u64 size) |
05039b92 | 993 | { |
7c7e9425 | 994 | struct pglist_data *pgdata = NODE_DATA(nid); |
776ed98b | 995 | struct zone *zone = pgdata->node_zones + ZONE_HIGHMEM; |
05039b92 DH |
996 | unsigned long start_pfn = start >> PAGE_SHIFT; |
997 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
998 | ||
999 | return __add_pages(zone, start_pfn, nr_pages); | |
1000 | } | |
9d99aaa3 | 1001 | #endif |
05039b92 | 1002 | |
1da177e4 LT |
1003 | /* |
1004 | * This function cannot be __init, since exceptions don't work in that | |
1005 | * section. Put this after the callers, so that it cannot be inlined. | |
1006 | */ | |
8550eb99 | 1007 | static noinline int do_test_wp_bit(void) |
1da177e4 LT |
1008 | { |
1009 | char tmp_reg; | |
1010 | int flag; | |
1011 | ||
1012 | __asm__ __volatile__( | |
8550eb99 IM |
1013 | " movb %0, %1 \n" |
1014 | "1: movb %1, %0 \n" | |
1015 | " xorl %2, %2 \n" | |
1da177e4 | 1016 | "2: \n" |
f832ff18 | 1017 | _ASM_EXTABLE(1b,2b) |
1da177e4 LT |
1018 | :"=m" (*(char *)fix_to_virt(FIX_WP_TEST)), |
1019 | "=q" (tmp_reg), | |
1020 | "=r" (flag) | |
1021 | :"2" (1) | |
1022 | :"memory"); | |
8550eb99 | 1023 | |
1da177e4 LT |
1024 | return flag; |
1025 | } | |
1026 | ||
63aaf308 | 1027 | #ifdef CONFIG_DEBUG_RODATA |
edeed305 AV |
1028 | const int rodata_test_data = 0xC3; |
1029 | EXPORT_SYMBOL_GPL(rodata_test_data); | |
63aaf308 | 1030 | |
63aaf308 AV |
1031 | void mark_rodata_ro(void) |
1032 | { | |
6fb14755 JB |
1033 | unsigned long start = PFN_ALIGN(_text); |
1034 | unsigned long size = PFN_ALIGN(_etext) - start; | |
63aaf308 | 1035 | |
8f0f996e SR |
1036 | #ifndef CONFIG_DYNAMIC_FTRACE |
1037 | /* Dynamic tracing modifies the kernel text section */ | |
4e4eee0e MD |
1038 | set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT); |
1039 | printk(KERN_INFO "Write protecting the kernel text: %luk\n", | |
1040 | size >> 10); | |
0c42f392 AK |
1041 | |
1042 | #ifdef CONFIG_CPA_DEBUG | |
4e4eee0e MD |
1043 | printk(KERN_INFO "Testing CPA: Reverting %lx-%lx\n", |
1044 | start, start+size); | |
1045 | set_pages_rw(virt_to_page(start), size>>PAGE_SHIFT); | |
0c42f392 | 1046 | |
4e4eee0e MD |
1047 | printk(KERN_INFO "Testing CPA: write protecting again\n"); |
1048 | set_pages_ro(virt_to_page(start), size>>PAGE_SHIFT); | |
602033ed | 1049 | #endif |
8f0f996e SR |
1050 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
1051 | ||
6fb14755 JB |
1052 | start += size; |
1053 | size = (unsigned long)__end_rodata - start; | |
6d238cc4 | 1054 | set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT); |
d7d119d7 IM |
1055 | printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n", |
1056 | size >> 10); | |
edeed305 | 1057 | rodata_test(); |
63aaf308 | 1058 | |
0c42f392 | 1059 | #ifdef CONFIG_CPA_DEBUG |
d7d119d7 | 1060 | printk(KERN_INFO "Testing CPA: undo %lx-%lx\n", start, start + size); |
6d238cc4 | 1061 | set_pages_rw(virt_to_page(start), size >> PAGE_SHIFT); |
0c42f392 | 1062 | |
d7d119d7 | 1063 | printk(KERN_INFO "Testing CPA: write protecting again\n"); |
6d238cc4 | 1064 | set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT); |
0c42f392 | 1065 | #endif |
63aaf308 AV |
1066 | } |
1067 | #endif | |
1068 | ||
9a0b5817 GH |
1069 | void free_init_pages(char *what, unsigned long begin, unsigned long end) |
1070 | { | |
ee01f112 IM |
1071 | #ifdef CONFIG_DEBUG_PAGEALLOC |
1072 | /* | |
1073 | * If debugging page accesses then do not free this memory but | |
1074 | * mark them not present - any buggy init-section access will | |
1075 | * create a kernel page fault: | |
1076 | */ | |
1077 | printk(KERN_INFO "debug: unmapping init memory %08lx..%08lx\n", | |
1078 | begin, PAGE_ALIGN(end)); | |
1079 | set_memory_np(begin, (end - begin) >> PAGE_SHIFT); | |
1080 | #else | |
86f03989 IM |
1081 | unsigned long addr; |
1082 | ||
3c1df68b AV |
1083 | /* |
1084 | * We just marked the kernel text read only above, now that | |
1085 | * we are going to free part of that, we need to make that | |
1086 | * writeable first. | |
1087 | */ | |
1088 | set_memory_rw(begin, (end - begin) >> PAGE_SHIFT); | |
1089 | ||
9a0b5817 | 1090 | for (addr = begin; addr < end; addr += PAGE_SIZE) { |
e3ebadd9 LT |
1091 | ClearPageReserved(virt_to_page(addr)); |
1092 | init_page_count(virt_to_page(addr)); | |
1093 | memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE); | |
1094 | free_page(addr); | |
9a0b5817 GH |
1095 | totalram_pages++; |
1096 | } | |
6fb14755 | 1097 | printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10); |
ee01f112 | 1098 | #endif |
9a0b5817 GH |
1099 | } |
1100 | ||
1101 | void free_initmem(void) | |
1102 | { | |
1103 | free_init_pages("unused kernel memory", | |
e3ebadd9 LT |
1104 | (unsigned long)(&__init_begin), |
1105 | (unsigned long)(&__init_end)); | |
9a0b5817 | 1106 | } |
63aaf308 | 1107 | |
1da177e4 LT |
1108 | #ifdef CONFIG_BLK_DEV_INITRD |
1109 | void free_initrd_mem(unsigned long start, unsigned long end) | |
1110 | { | |
e3ebadd9 | 1111 | free_init_pages("initrd memory", start, end); |
1da177e4 LT |
1112 | } |
1113 | #endif | |
d2dbf343 YL |
1114 | |
1115 | int __init reserve_bootmem_generic(unsigned long phys, unsigned long len, | |
1116 | int flags) | |
1117 | { | |
1118 | return reserve_bootmem(phys, len, flags); | |
1119 | } |