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1da177e4 LT |
1 | /* |
2 | * linux/arch/i386/mm/init.c | |
3 | * | |
4 | * Copyright (C) 1995 Linus Torvalds | |
5 | * | |
6 | * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999 | |
7 | */ | |
8 | ||
9 | #include <linux/config.h> | |
10 | #include <linux/module.h> | |
11 | #include <linux/signal.h> | |
12 | #include <linux/sched.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/errno.h> | |
15 | #include <linux/string.h> | |
16 | #include <linux/types.h> | |
17 | #include <linux/ptrace.h> | |
18 | #include <linux/mman.h> | |
19 | #include <linux/mm.h> | |
20 | #include <linux/hugetlb.h> | |
21 | #include <linux/swap.h> | |
22 | #include <linux/smp.h> | |
23 | #include <linux/init.h> | |
24 | #include <linux/highmem.h> | |
25 | #include <linux/pagemap.h> | |
26 | #include <linux/bootmem.h> | |
27 | #include <linux/slab.h> | |
28 | #include <linux/proc_fs.h> | |
29 | #include <linux/efi.h> | |
30 | ||
31 | #include <asm/processor.h> | |
32 | #include <asm/system.h> | |
33 | #include <asm/uaccess.h> | |
34 | #include <asm/pgtable.h> | |
35 | #include <asm/dma.h> | |
36 | #include <asm/fixmap.h> | |
37 | #include <asm/e820.h> | |
38 | #include <asm/apic.h> | |
39 | #include <asm/tlb.h> | |
40 | #include <asm/tlbflush.h> | |
41 | #include <asm/sections.h> | |
42 | ||
43 | unsigned int __VMALLOC_RESERVE = 128 << 20; | |
44 | ||
45 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); | |
46 | unsigned long highstart_pfn, highend_pfn; | |
47 | ||
48 | static int noinline do_test_wp_bit(void); | |
49 | ||
50 | /* | |
51 | * Creates a middle page table and puts a pointer to it in the | |
52 | * given global directory entry. This only returns the gd entry | |
53 | * in non-PAE compilation mode, since the middle layer is folded. | |
54 | */ | |
55 | static pmd_t * __init one_md_table_init(pgd_t *pgd) | |
56 | { | |
57 | pud_t *pud; | |
58 | pmd_t *pmd_table; | |
59 | ||
60 | #ifdef CONFIG_X86_PAE | |
61 | pmd_table = (pmd_t *) alloc_bootmem_low_pages(PAGE_SIZE); | |
62 | set_pgd(pgd, __pgd(__pa(pmd_table) | _PAGE_PRESENT)); | |
63 | pud = pud_offset(pgd, 0); | |
64 | if (pmd_table != pmd_offset(pud, 0)) | |
65 | BUG(); | |
66 | #else | |
67 | pud = pud_offset(pgd, 0); | |
68 | pmd_table = pmd_offset(pud, 0); | |
69 | #endif | |
70 | ||
71 | return pmd_table; | |
72 | } | |
73 | ||
74 | /* | |
75 | * Create a page table and place a pointer to it in a middle page | |
76 | * directory entry. | |
77 | */ | |
78 | static pte_t * __init one_page_table_init(pmd_t *pmd) | |
79 | { | |
80 | if (pmd_none(*pmd)) { | |
81 | pte_t *page_table = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE); | |
82 | set_pmd(pmd, __pmd(__pa(page_table) | _PAGE_TABLE)); | |
83 | if (page_table != pte_offset_kernel(pmd, 0)) | |
84 | BUG(); | |
85 | ||
86 | return page_table; | |
87 | } | |
88 | ||
89 | return pte_offset_kernel(pmd, 0); | |
90 | } | |
91 | ||
92 | /* | |
93 | * This function initializes a certain range of kernel virtual memory | |
94 | * with new bootmem page tables, everywhere page tables are missing in | |
95 | * the given range. | |
96 | */ | |
97 | ||
98 | /* | |
99 | * NOTE: The pagetables are allocated contiguous on the physical space | |
100 | * so we can cache the place of the first one and move around without | |
101 | * checking the pgd every time. | |
102 | */ | |
103 | static void __init page_table_range_init (unsigned long start, unsigned long end, pgd_t *pgd_base) | |
104 | { | |
105 | pgd_t *pgd; | |
106 | pud_t *pud; | |
107 | pmd_t *pmd; | |
108 | int pgd_idx, pmd_idx; | |
109 | unsigned long vaddr; | |
110 | ||
111 | vaddr = start; | |
112 | pgd_idx = pgd_index(vaddr); | |
113 | pmd_idx = pmd_index(vaddr); | |
114 | pgd = pgd_base + pgd_idx; | |
115 | ||
116 | for ( ; (pgd_idx < PTRS_PER_PGD) && (vaddr != end); pgd++, pgd_idx++) { | |
117 | if (pgd_none(*pgd)) | |
118 | one_md_table_init(pgd); | |
119 | pud = pud_offset(pgd, vaddr); | |
120 | pmd = pmd_offset(pud, vaddr); | |
121 | for (; (pmd_idx < PTRS_PER_PMD) && (vaddr != end); pmd++, pmd_idx++) { | |
122 | if (pmd_none(*pmd)) | |
123 | one_page_table_init(pmd); | |
124 | ||
125 | vaddr += PMD_SIZE; | |
126 | } | |
127 | pmd_idx = 0; | |
128 | } | |
129 | } | |
130 | ||
131 | static inline int is_kernel_text(unsigned long addr) | |
132 | { | |
133 | if (addr >= PAGE_OFFSET && addr <= (unsigned long)__init_end) | |
134 | return 1; | |
135 | return 0; | |
136 | } | |
137 | ||
138 | /* | |
139 | * This maps the physical memory to kernel virtual address space, a total | |
140 | * of max_low_pfn pages, by creating page tables starting from address | |
141 | * PAGE_OFFSET. | |
142 | */ | |
143 | static void __init kernel_physical_mapping_init(pgd_t *pgd_base) | |
144 | { | |
145 | unsigned long pfn; | |
146 | pgd_t *pgd; | |
147 | pmd_t *pmd; | |
148 | pte_t *pte; | |
149 | int pgd_idx, pmd_idx, pte_ofs; | |
150 | ||
151 | pgd_idx = pgd_index(PAGE_OFFSET); | |
152 | pgd = pgd_base + pgd_idx; | |
153 | pfn = 0; | |
154 | ||
155 | for (; pgd_idx < PTRS_PER_PGD; pgd++, pgd_idx++) { | |
156 | pmd = one_md_table_init(pgd); | |
157 | if (pfn >= max_low_pfn) | |
158 | continue; | |
159 | for (pmd_idx = 0; pmd_idx < PTRS_PER_PMD && pfn < max_low_pfn; pmd++, pmd_idx++) { | |
160 | unsigned int address = pfn * PAGE_SIZE + PAGE_OFFSET; | |
161 | ||
162 | /* Map with big pages if possible, otherwise create normal page tables. */ | |
163 | if (cpu_has_pse) { | |
164 | unsigned int address2 = (pfn + PTRS_PER_PTE - 1) * PAGE_SIZE + PAGE_OFFSET + PAGE_SIZE-1; | |
165 | ||
166 | if (is_kernel_text(address) || is_kernel_text(address2)) | |
167 | set_pmd(pmd, pfn_pmd(pfn, PAGE_KERNEL_LARGE_EXEC)); | |
168 | else | |
169 | set_pmd(pmd, pfn_pmd(pfn, PAGE_KERNEL_LARGE)); | |
170 | pfn += PTRS_PER_PTE; | |
171 | } else { | |
172 | pte = one_page_table_init(pmd); | |
173 | ||
174 | for (pte_ofs = 0; pte_ofs < PTRS_PER_PTE && pfn < max_low_pfn; pte++, pfn++, pte_ofs++) { | |
175 | if (is_kernel_text(address)) | |
176 | set_pte(pte, pfn_pte(pfn, PAGE_KERNEL_EXEC)); | |
177 | else | |
178 | set_pte(pte, pfn_pte(pfn, PAGE_KERNEL)); | |
179 | } | |
180 | } | |
181 | } | |
182 | } | |
183 | } | |
184 | ||
185 | static inline int page_kills_ppro(unsigned long pagenr) | |
186 | { | |
187 | if (pagenr >= 0x70000 && pagenr <= 0x7003F) | |
188 | return 1; | |
189 | return 0; | |
190 | } | |
191 | ||
192 | extern int is_available_memory(efi_memory_desc_t *); | |
193 | ||
5b505b90 | 194 | int page_is_ram(unsigned long pagenr) |
1da177e4 LT |
195 | { |
196 | int i; | |
197 | unsigned long addr, end; | |
198 | ||
199 | if (efi_enabled) { | |
200 | efi_memory_desc_t *md; | |
201 | ||
202 | for (i = 0; i < memmap.nr_map; i++) { | |
203 | md = &memmap.map[i]; | |
204 | if (!is_available_memory(md)) | |
205 | continue; | |
206 | addr = (md->phys_addr+PAGE_SIZE-1) >> PAGE_SHIFT; | |
207 | end = (md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT)) >> PAGE_SHIFT; | |
208 | ||
209 | if ((pagenr >= addr) && (pagenr < end)) | |
210 | return 1; | |
211 | } | |
212 | return 0; | |
213 | } | |
214 | ||
215 | for (i = 0; i < e820.nr_map; i++) { | |
216 | ||
217 | if (e820.map[i].type != E820_RAM) /* not usable memory */ | |
218 | continue; | |
219 | /* | |
220 | * !!!FIXME!!! Some BIOSen report areas as RAM that | |
221 | * are not. Notably the 640->1Mb area. We need a sanity | |
222 | * check here. | |
223 | */ | |
224 | addr = (e820.map[i].addr+PAGE_SIZE-1) >> PAGE_SHIFT; | |
225 | end = (e820.map[i].addr+e820.map[i].size) >> PAGE_SHIFT; | |
226 | if ((pagenr >= addr) && (pagenr < end)) | |
227 | return 1; | |
228 | } | |
229 | return 0; | |
230 | } | |
231 | ||
232 | #ifdef CONFIG_HIGHMEM | |
233 | pte_t *kmap_pte; | |
234 | pgprot_t kmap_prot; | |
235 | ||
236 | #define kmap_get_fixmap_pte(vaddr) \ | |
237 | pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), vaddr), (vaddr)), (vaddr)) | |
238 | ||
239 | static void __init kmap_init(void) | |
240 | { | |
241 | unsigned long kmap_vstart; | |
242 | ||
243 | /* cache the first kmap pte */ | |
244 | kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN); | |
245 | kmap_pte = kmap_get_fixmap_pte(kmap_vstart); | |
246 | ||
247 | kmap_prot = PAGE_KERNEL; | |
248 | } | |
249 | ||
250 | static void __init permanent_kmaps_init(pgd_t *pgd_base) | |
251 | { | |
252 | pgd_t *pgd; | |
253 | pud_t *pud; | |
254 | pmd_t *pmd; | |
255 | pte_t *pte; | |
256 | unsigned long vaddr; | |
257 | ||
258 | vaddr = PKMAP_BASE; | |
259 | page_table_range_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base); | |
260 | ||
261 | pgd = swapper_pg_dir + pgd_index(vaddr); | |
262 | pud = pud_offset(pgd, vaddr); | |
263 | pmd = pmd_offset(pud, vaddr); | |
264 | pte = pte_offset_kernel(pmd, vaddr); | |
265 | pkmap_page_table = pte; | |
266 | } | |
267 | ||
268 | void __init one_highpage_init(struct page *page, int pfn, int bad_ppro) | |
269 | { | |
270 | if (page_is_ram(pfn) && !(bad_ppro && page_kills_ppro(pfn))) { | |
271 | ClearPageReserved(page); | |
1da177e4 LT |
272 | set_page_count(page, 1); |
273 | __free_page(page); | |
274 | totalhigh_pages++; | |
275 | } else | |
276 | SetPageReserved(page); | |
277 | } | |
278 | ||
05b79bdc AW |
279 | #ifdef CONFIG_NUMA |
280 | extern void set_highmem_pages_init(int); | |
281 | #else | |
1da177e4 LT |
282 | static void __init set_highmem_pages_init(int bad_ppro) |
283 | { | |
284 | int pfn; | |
285 | for (pfn = highstart_pfn; pfn < highend_pfn; pfn++) | |
286 | one_highpage_init(pfn_to_page(pfn), pfn, bad_ppro); | |
287 | totalram_pages += totalhigh_pages; | |
288 | } | |
05b79bdc | 289 | #endif /* CONFIG_FLATMEM */ |
1da177e4 LT |
290 | |
291 | #else | |
292 | #define kmap_init() do { } while (0) | |
293 | #define permanent_kmaps_init(pgd_base) do { } while (0) | |
294 | #define set_highmem_pages_init(bad_ppro) do { } while (0) | |
295 | #endif /* CONFIG_HIGHMEM */ | |
296 | ||
297 | unsigned long long __PAGE_KERNEL = _PAGE_KERNEL; | |
129f6946 | 298 | EXPORT_SYMBOL(__PAGE_KERNEL); |
1da177e4 LT |
299 | unsigned long long __PAGE_KERNEL_EXEC = _PAGE_KERNEL_EXEC; |
300 | ||
05b79bdc | 301 | #ifdef CONFIG_NUMA |
1da177e4 | 302 | extern void __init remap_numa_kva(void); |
05b79bdc AW |
303 | #else |
304 | #define remap_numa_kva() do {} while (0) | |
1da177e4 LT |
305 | #endif |
306 | ||
307 | static void __init pagetable_init (void) | |
308 | { | |
309 | unsigned long vaddr; | |
310 | pgd_t *pgd_base = swapper_pg_dir; | |
311 | ||
312 | #ifdef CONFIG_X86_PAE | |
313 | int i; | |
314 | /* Init entries of the first-level page table to the zero page */ | |
315 | for (i = 0; i < PTRS_PER_PGD; i++) | |
316 | set_pgd(pgd_base + i, __pgd(__pa(empty_zero_page) | _PAGE_PRESENT)); | |
317 | #endif | |
318 | ||
319 | /* Enable PSE if available */ | |
320 | if (cpu_has_pse) { | |
321 | set_in_cr4(X86_CR4_PSE); | |
322 | } | |
323 | ||
324 | /* Enable PGE if available */ | |
325 | if (cpu_has_pge) { | |
326 | set_in_cr4(X86_CR4_PGE); | |
327 | __PAGE_KERNEL |= _PAGE_GLOBAL; | |
328 | __PAGE_KERNEL_EXEC |= _PAGE_GLOBAL; | |
329 | } | |
330 | ||
331 | kernel_physical_mapping_init(pgd_base); | |
332 | remap_numa_kva(); | |
333 | ||
334 | /* | |
335 | * Fixed mappings, only the page table structure has to be | |
336 | * created - mappings will be set by set_fixmap(): | |
337 | */ | |
338 | vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK; | |
339 | page_table_range_init(vaddr, 0, pgd_base); | |
340 | ||
341 | permanent_kmaps_init(pgd_base); | |
342 | ||
343 | #ifdef CONFIG_X86_PAE | |
344 | /* | |
345 | * Add low memory identity-mappings - SMP needs it when | |
346 | * starting up on an AP from real-mode. In the non-PAE | |
347 | * case we already have these mappings through head.S. | |
348 | * All user-space mappings are explicitly cleared after | |
349 | * SMP startup. | |
350 | */ | |
351 | pgd_base[0] = pgd_base[USER_PTRS_PER_PGD]; | |
352 | #endif | |
353 | } | |
354 | ||
648be318 | 355 | #ifdef CONFIG_SOFTWARE_SUSPEND |
1da177e4 LT |
356 | /* |
357 | * Swap suspend & friends need this for resume because things like the intel-agp | |
358 | * driver might have split up a kernel 4MB mapping. | |
359 | */ | |
360 | char __nosavedata swsusp_pg_dir[PAGE_SIZE] | |
361 | __attribute__ ((aligned (PAGE_SIZE))); | |
362 | ||
363 | static inline void save_pg_dir(void) | |
364 | { | |
365 | memcpy(swsusp_pg_dir, swapper_pg_dir, PAGE_SIZE); | |
366 | } | |
367 | #else | |
368 | static inline void save_pg_dir(void) | |
369 | { | |
370 | } | |
371 | #endif | |
372 | ||
373 | void zap_low_mappings (void) | |
374 | { | |
375 | int i; | |
376 | ||
377 | save_pg_dir(); | |
378 | ||
379 | /* | |
380 | * Zap initial low-memory mappings. | |
381 | * | |
382 | * Note that "pgd_clear()" doesn't do it for | |
383 | * us, because pgd_clear() is a no-op on i386. | |
384 | */ | |
385 | for (i = 0; i < USER_PTRS_PER_PGD; i++) | |
386 | #ifdef CONFIG_X86_PAE | |
387 | set_pgd(swapper_pg_dir+i, __pgd(1 + __pa(empty_zero_page))); | |
388 | #else | |
389 | set_pgd(swapper_pg_dir+i, __pgd(0)); | |
390 | #endif | |
391 | flush_tlb_all(); | |
392 | } | |
393 | ||
394 | static int disable_nx __initdata = 0; | |
395 | u64 __supported_pte_mask = ~_PAGE_NX; | |
396 | ||
397 | /* | |
398 | * noexec = on|off | |
399 | * | |
400 | * Control non executable mappings. | |
401 | * | |
402 | * on Enable | |
403 | * off Disable | |
404 | */ | |
405 | void __init noexec_setup(const char *str) | |
406 | { | |
407 | if (!strncmp(str, "on",2) && cpu_has_nx) { | |
408 | __supported_pte_mask |= _PAGE_NX; | |
409 | disable_nx = 0; | |
410 | } else if (!strncmp(str,"off",3)) { | |
411 | disable_nx = 1; | |
412 | __supported_pte_mask &= ~_PAGE_NX; | |
413 | } | |
414 | } | |
415 | ||
416 | int nx_enabled = 0; | |
417 | #ifdef CONFIG_X86_PAE | |
418 | ||
419 | static void __init set_nx(void) | |
420 | { | |
421 | unsigned int v[4], l, h; | |
422 | ||
423 | if (cpu_has_pae && (cpuid_eax(0x80000000) > 0x80000001)) { | |
424 | cpuid(0x80000001, &v[0], &v[1], &v[2], &v[3]); | |
425 | if ((v[3] & (1 << 20)) && !disable_nx) { | |
426 | rdmsr(MSR_EFER, l, h); | |
427 | l |= EFER_NX; | |
428 | wrmsr(MSR_EFER, l, h); | |
429 | nx_enabled = 1; | |
430 | __supported_pte_mask |= _PAGE_NX; | |
431 | } | |
432 | } | |
433 | } | |
434 | ||
435 | /* | |
436 | * Enables/disables executability of a given kernel page and | |
437 | * returns the previous setting. | |
438 | */ | |
439 | int __init set_kernel_exec(unsigned long vaddr, int enable) | |
440 | { | |
441 | pte_t *pte; | |
442 | int ret = 1; | |
443 | ||
444 | if (!nx_enabled) | |
445 | goto out; | |
446 | ||
447 | pte = lookup_address(vaddr); | |
448 | BUG_ON(!pte); | |
449 | ||
450 | if (!pte_exec_kernel(*pte)) | |
451 | ret = 0; | |
452 | ||
453 | if (enable) | |
454 | pte->pte_high &= ~(1 << (_PAGE_BIT_NX - 32)); | |
455 | else | |
456 | pte->pte_high |= 1 << (_PAGE_BIT_NX - 32); | |
457 | __flush_tlb_all(); | |
458 | out: | |
459 | return ret; | |
460 | } | |
461 | ||
462 | #endif | |
463 | ||
464 | /* | |
465 | * paging_init() sets up the page tables - note that the first 8MB are | |
466 | * already mapped by head.S. | |
467 | * | |
468 | * This routines also unmaps the page at virtual kernel address 0, so | |
469 | * that we can trap those pesky NULL-reference errors in the kernel. | |
470 | */ | |
471 | void __init paging_init(void) | |
472 | { | |
473 | #ifdef CONFIG_X86_PAE | |
474 | set_nx(); | |
475 | if (nx_enabled) | |
476 | printk("NX (Execute Disable) protection: active\n"); | |
477 | #endif | |
478 | ||
479 | pagetable_init(); | |
480 | ||
481 | load_cr3(swapper_pg_dir); | |
482 | ||
483 | #ifdef CONFIG_X86_PAE | |
484 | /* | |
485 | * We will bail out later - printk doesn't work right now so | |
486 | * the user would just see a hanging kernel. | |
487 | */ | |
488 | if (cpu_has_pae) | |
489 | set_in_cr4(X86_CR4_PAE); | |
490 | #endif | |
491 | __flush_tlb_all(); | |
492 | ||
493 | kmap_init(); | |
494 | } | |
495 | ||
496 | /* | |
497 | * Test if the WP bit works in supervisor mode. It isn't supported on 386's | |
498 | * and also on some strange 486's (NexGen etc.). All 586+'s are OK. This | |
499 | * used to involve black magic jumps to work around some nasty CPU bugs, | |
500 | * but fortunately the switch to using exceptions got rid of all that. | |
501 | */ | |
502 | ||
503 | static void __init test_wp_bit(void) | |
504 | { | |
505 | printk("Checking if this processor honours the WP bit even in supervisor mode... "); | |
506 | ||
507 | /* Any page-aligned address will do, the test is non-destructive */ | |
508 | __set_fixmap(FIX_WP_TEST, __pa(&swapper_pg_dir), PAGE_READONLY); | |
509 | boot_cpu_data.wp_works_ok = do_test_wp_bit(); | |
510 | clear_fixmap(FIX_WP_TEST); | |
511 | ||
512 | if (!boot_cpu_data.wp_works_ok) { | |
513 | printk("No.\n"); | |
514 | #ifdef CONFIG_X86_WP_WORKS_OK | |
515 | panic("This kernel doesn't support CPU's with broken WP. Recompile it for a 386!"); | |
516 | #endif | |
517 | } else { | |
518 | printk("Ok.\n"); | |
519 | } | |
520 | } | |
521 | ||
522 | static void __init set_max_mapnr_init(void) | |
523 | { | |
524 | #ifdef CONFIG_HIGHMEM | |
525 | num_physpages = highend_pfn; | |
526 | #else | |
527 | num_physpages = max_low_pfn; | |
528 | #endif | |
05b79bdc | 529 | #ifdef CONFIG_FLATMEM |
1da177e4 LT |
530 | max_mapnr = num_physpages; |
531 | #endif | |
532 | } | |
533 | ||
534 | static struct kcore_list kcore_mem, kcore_vmalloc; | |
535 | ||
536 | void __init mem_init(void) | |
537 | { | |
538 | extern int ppro_with_ram_bug(void); | |
539 | int codesize, reservedpages, datasize, initsize; | |
540 | int tmp; | |
541 | int bad_ppro; | |
542 | ||
05b79bdc | 543 | #ifdef CONFIG_FLATMEM |
1da177e4 LT |
544 | if (!mem_map) |
545 | BUG(); | |
546 | #endif | |
547 | ||
548 | bad_ppro = ppro_with_ram_bug(); | |
549 | ||
550 | #ifdef CONFIG_HIGHMEM | |
551 | /* check that fixmap and pkmap do not overlap */ | |
552 | if (PKMAP_BASE+LAST_PKMAP*PAGE_SIZE >= FIXADDR_START) { | |
553 | printk(KERN_ERR "fixmap and kmap areas overlap - this will crash\n"); | |
554 | printk(KERN_ERR "pkstart: %lxh pkend: %lxh fixstart %lxh\n", | |
555 | PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE, FIXADDR_START); | |
556 | BUG(); | |
557 | } | |
558 | #endif | |
559 | ||
560 | set_max_mapnr_init(); | |
561 | ||
562 | #ifdef CONFIG_HIGHMEM | |
563 | high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1; | |
564 | #else | |
565 | high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1; | |
566 | #endif | |
567 | ||
568 | /* this will put all low memory onto the freelists */ | |
569 | totalram_pages += free_all_bootmem(); | |
570 | ||
571 | reservedpages = 0; | |
572 | for (tmp = 0; tmp < max_low_pfn; tmp++) | |
573 | /* | |
574 | * Only count reserved RAM pages | |
575 | */ | |
576 | if (page_is_ram(tmp) && PageReserved(pfn_to_page(tmp))) | |
577 | reservedpages++; | |
578 | ||
579 | set_highmem_pages_init(bad_ppro); | |
580 | ||
581 | codesize = (unsigned long) &_etext - (unsigned long) &_text; | |
582 | datasize = (unsigned long) &_edata - (unsigned long) &_etext; | |
583 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; | |
584 | ||
585 | kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT); | |
586 | kclist_add(&kcore_vmalloc, (void *)VMALLOC_START, | |
587 | VMALLOC_END-VMALLOC_START); | |
588 | ||
589 | printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init, %ldk highmem)\n", | |
590 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), | |
591 | num_physpages << (PAGE_SHIFT-10), | |
592 | codesize >> 10, | |
593 | reservedpages << (PAGE_SHIFT-10), | |
594 | datasize >> 10, | |
595 | initsize >> 10, | |
596 | (unsigned long) (totalhigh_pages << (PAGE_SHIFT-10)) | |
597 | ); | |
598 | ||
599 | #ifdef CONFIG_X86_PAE | |
600 | if (!cpu_has_pae) | |
601 | panic("cannot execute a PAE-enabled kernel on a PAE-less CPU!"); | |
602 | #endif | |
603 | if (boot_cpu_data.wp_works_ok < 0) | |
604 | test_wp_bit(); | |
605 | ||
606 | /* | |
607 | * Subtle. SMP is doing it's boot stuff late (because it has to | |
608 | * fork idle threads) - but it also needs low mappings for the | |
609 | * protected-mode entry to work. We zap these entries only after | |
610 | * the WP-bit has been tested. | |
611 | */ | |
612 | #ifndef CONFIG_SMP | |
613 | zap_low_mappings(); | |
614 | #endif | |
615 | } | |
616 | ||
617 | kmem_cache_t *pgd_cache; | |
618 | kmem_cache_t *pmd_cache; | |
619 | ||
620 | void __init pgtable_cache_init(void) | |
621 | { | |
622 | if (PTRS_PER_PMD > 1) { | |
623 | pmd_cache = kmem_cache_create("pmd", | |
624 | PTRS_PER_PMD*sizeof(pmd_t), | |
625 | PTRS_PER_PMD*sizeof(pmd_t), | |
626 | 0, | |
627 | pmd_ctor, | |
628 | NULL); | |
629 | if (!pmd_cache) | |
630 | panic("pgtable_cache_init(): cannot create pmd cache"); | |
631 | } | |
632 | pgd_cache = kmem_cache_create("pgd", | |
633 | PTRS_PER_PGD*sizeof(pgd_t), | |
634 | PTRS_PER_PGD*sizeof(pgd_t), | |
635 | 0, | |
636 | pgd_ctor, | |
637 | PTRS_PER_PMD == 1 ? pgd_dtor : NULL); | |
638 | if (!pgd_cache) | |
639 | panic("pgtable_cache_init(): Cannot create pgd cache"); | |
640 | } | |
641 | ||
642 | /* | |
643 | * This function cannot be __init, since exceptions don't work in that | |
644 | * section. Put this after the callers, so that it cannot be inlined. | |
645 | */ | |
646 | static int noinline do_test_wp_bit(void) | |
647 | { | |
648 | char tmp_reg; | |
649 | int flag; | |
650 | ||
651 | __asm__ __volatile__( | |
652 | " movb %0,%1 \n" | |
653 | "1: movb %1,%0 \n" | |
654 | " xorl %2,%2 \n" | |
655 | "2: \n" | |
656 | ".section __ex_table,\"a\"\n" | |
657 | " .align 4 \n" | |
658 | " .long 1b,2b \n" | |
659 | ".previous \n" | |
660 | :"=m" (*(char *)fix_to_virt(FIX_WP_TEST)), | |
661 | "=q" (tmp_reg), | |
662 | "=r" (flag) | |
663 | :"2" (1) | |
664 | :"memory"); | |
665 | ||
666 | return flag; | |
667 | } | |
668 | ||
669 | void free_initmem(void) | |
670 | { | |
671 | unsigned long addr; | |
672 | ||
673 | addr = (unsigned long)(&__init_begin); | |
674 | for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) { | |
675 | ClearPageReserved(virt_to_page(addr)); | |
676 | set_page_count(virt_to_page(addr), 1); | |
677 | memset((void *)addr, 0xcc, PAGE_SIZE); | |
678 | free_page(addr); | |
679 | totalram_pages++; | |
680 | } | |
681 | printk (KERN_INFO "Freeing unused kernel memory: %dk freed\n", (__init_end - __init_begin) >> 10); | |
682 | } | |
683 | ||
684 | #ifdef CONFIG_BLK_DEV_INITRD | |
685 | void free_initrd_mem(unsigned long start, unsigned long end) | |
686 | { | |
687 | if (start < end) | |
688 | printk (KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10); | |
689 | for (; start < end; start += PAGE_SIZE) { | |
690 | ClearPageReserved(virt_to_page(start)); | |
691 | set_page_count(virt_to_page(start), 1); | |
692 | free_page(start); | |
693 | totalram_pages++; | |
694 | } | |
695 | } | |
696 | #endif |