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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> | |
05039b92 | 30 | #include <linux/memory_hotplug.h> |
27d99f7e | 31 | #include <linux/initrd.h> |
1da177e4 LT |
32 | |
33 | #include <asm/processor.h> | |
34 | #include <asm/system.h> | |
35 | #include <asm/uaccess.h> | |
36 | #include <asm/pgtable.h> | |
37 | #include <asm/dma.h> | |
38 | #include <asm/fixmap.h> | |
39 | #include <asm/e820.h> | |
40 | #include <asm/apic.h> | |
41 | #include <asm/tlb.h> | |
42 | #include <asm/tlbflush.h> | |
43 | #include <asm/sections.h> | |
44 | ||
45 | unsigned int __VMALLOC_RESERVE = 128 << 20; | |
46 | ||
47 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); | |
48 | unsigned long highstart_pfn, highend_pfn; | |
49 | ||
50 | static int noinline do_test_wp_bit(void); | |
51 | ||
52 | /* | |
53 | * Creates a middle page table and puts a pointer to it in the | |
54 | * given global directory entry. This only returns the gd entry | |
55 | * in non-PAE compilation mode, since the middle layer is folded. | |
56 | */ | |
57 | static pmd_t * __init one_md_table_init(pgd_t *pgd) | |
58 | { | |
59 | pud_t *pud; | |
60 | pmd_t *pmd_table; | |
61 | ||
62 | #ifdef CONFIG_X86_PAE | |
63 | pmd_table = (pmd_t *) alloc_bootmem_low_pages(PAGE_SIZE); | |
64 | set_pgd(pgd, __pgd(__pa(pmd_table) | _PAGE_PRESENT)); | |
65 | pud = pud_offset(pgd, 0); | |
66 | if (pmd_table != pmd_offset(pud, 0)) | |
67 | BUG(); | |
68 | #else | |
69 | pud = pud_offset(pgd, 0); | |
70 | pmd_table = pmd_offset(pud, 0); | |
71 | #endif | |
72 | ||
73 | return pmd_table; | |
74 | } | |
75 | ||
76 | /* | |
77 | * Create a page table and place a pointer to it in a middle page | |
78 | * directory entry. | |
79 | */ | |
80 | static pte_t * __init one_page_table_init(pmd_t *pmd) | |
81 | { | |
82 | if (pmd_none(*pmd)) { | |
83 | pte_t *page_table = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE); | |
84 | set_pmd(pmd, __pmd(__pa(page_table) | _PAGE_TABLE)); | |
85 | if (page_table != pte_offset_kernel(pmd, 0)) | |
86 | BUG(); | |
87 | ||
88 | return page_table; | |
89 | } | |
90 | ||
91 | return pte_offset_kernel(pmd, 0); | |
92 | } | |
93 | ||
94 | /* | |
95 | * This function initializes a certain range of kernel virtual memory | |
96 | * with new bootmem page tables, everywhere page tables are missing in | |
97 | * the given range. | |
98 | */ | |
99 | ||
100 | /* | |
101 | * NOTE: The pagetables are allocated contiguous on the physical space | |
102 | * so we can cache the place of the first one and move around without | |
103 | * checking the pgd every time. | |
104 | */ | |
105 | static void __init page_table_range_init (unsigned long start, unsigned long end, pgd_t *pgd_base) | |
106 | { | |
107 | pgd_t *pgd; | |
108 | pud_t *pud; | |
109 | pmd_t *pmd; | |
110 | int pgd_idx, pmd_idx; | |
111 | unsigned long vaddr; | |
112 | ||
113 | vaddr = start; | |
114 | pgd_idx = pgd_index(vaddr); | |
115 | pmd_idx = pmd_index(vaddr); | |
116 | pgd = pgd_base + pgd_idx; | |
117 | ||
118 | for ( ; (pgd_idx < PTRS_PER_PGD) && (vaddr != end); pgd++, pgd_idx++) { | |
119 | if (pgd_none(*pgd)) | |
120 | one_md_table_init(pgd); | |
121 | pud = pud_offset(pgd, vaddr); | |
122 | pmd = pmd_offset(pud, vaddr); | |
123 | for (; (pmd_idx < PTRS_PER_PMD) && (vaddr != end); pmd++, pmd_idx++) { | |
124 | if (pmd_none(*pmd)) | |
125 | one_page_table_init(pmd); | |
126 | ||
127 | vaddr += PMD_SIZE; | |
128 | } | |
129 | pmd_idx = 0; | |
130 | } | |
131 | } | |
132 | ||
133 | static inline int is_kernel_text(unsigned long addr) | |
134 | { | |
135 | if (addr >= PAGE_OFFSET && addr <= (unsigned long)__init_end) | |
136 | return 1; | |
137 | return 0; | |
138 | } | |
139 | ||
140 | /* | |
141 | * This maps the physical memory to kernel virtual address space, a total | |
142 | * of max_low_pfn pages, by creating page tables starting from address | |
143 | * PAGE_OFFSET. | |
144 | */ | |
145 | static void __init kernel_physical_mapping_init(pgd_t *pgd_base) | |
146 | { | |
147 | unsigned long pfn; | |
148 | pgd_t *pgd; | |
149 | pmd_t *pmd; | |
150 | pte_t *pte; | |
151 | int pgd_idx, pmd_idx, pte_ofs; | |
152 | ||
153 | pgd_idx = pgd_index(PAGE_OFFSET); | |
154 | pgd = pgd_base + pgd_idx; | |
155 | pfn = 0; | |
156 | ||
157 | for (; pgd_idx < PTRS_PER_PGD; pgd++, pgd_idx++) { | |
158 | pmd = one_md_table_init(pgd); | |
159 | if (pfn >= max_low_pfn) | |
160 | continue; | |
161 | for (pmd_idx = 0; pmd_idx < PTRS_PER_PMD && pfn < max_low_pfn; pmd++, pmd_idx++) { | |
162 | unsigned int address = pfn * PAGE_SIZE + PAGE_OFFSET; | |
163 | ||
164 | /* Map with big pages if possible, otherwise create normal page tables. */ | |
165 | if (cpu_has_pse) { | |
166 | unsigned int address2 = (pfn + PTRS_PER_PTE - 1) * PAGE_SIZE + PAGE_OFFSET + PAGE_SIZE-1; | |
167 | ||
168 | if (is_kernel_text(address) || is_kernel_text(address2)) | |
169 | set_pmd(pmd, pfn_pmd(pfn, PAGE_KERNEL_LARGE_EXEC)); | |
170 | else | |
171 | set_pmd(pmd, pfn_pmd(pfn, PAGE_KERNEL_LARGE)); | |
172 | pfn += PTRS_PER_PTE; | |
173 | } else { | |
174 | pte = one_page_table_init(pmd); | |
175 | ||
176 | for (pte_ofs = 0; pte_ofs < PTRS_PER_PTE && pfn < max_low_pfn; pte++, pfn++, pte_ofs++) { | |
177 | if (is_kernel_text(address)) | |
178 | set_pte(pte, pfn_pte(pfn, PAGE_KERNEL_EXEC)); | |
179 | else | |
180 | set_pte(pte, pfn_pte(pfn, PAGE_KERNEL)); | |
181 | } | |
182 | } | |
183 | } | |
184 | } | |
185 | } | |
186 | ||
187 | static inline int page_kills_ppro(unsigned long pagenr) | |
188 | { | |
189 | if (pagenr >= 0x70000 && pagenr <= 0x7003F) | |
190 | return 1; | |
191 | return 0; | |
192 | } | |
193 | ||
194 | extern int is_available_memory(efi_memory_desc_t *); | |
195 | ||
5b505b90 | 196 | int page_is_ram(unsigned long pagenr) |
1da177e4 LT |
197 | { |
198 | int i; | |
199 | unsigned long addr, end; | |
200 | ||
201 | if (efi_enabled) { | |
202 | efi_memory_desc_t *md; | |
7ae65fd3 | 203 | void *p; |
1da177e4 | 204 | |
7ae65fd3 MT |
205 | for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { |
206 | md = p; | |
1da177e4 LT |
207 | if (!is_available_memory(md)) |
208 | continue; | |
209 | addr = (md->phys_addr+PAGE_SIZE-1) >> PAGE_SHIFT; | |
210 | end = (md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT)) >> PAGE_SHIFT; | |
211 | ||
212 | if ((pagenr >= addr) && (pagenr < end)) | |
213 | return 1; | |
214 | } | |
215 | return 0; | |
216 | } | |
217 | ||
218 | for (i = 0; i < e820.nr_map; i++) { | |
219 | ||
220 | if (e820.map[i].type != E820_RAM) /* not usable memory */ | |
221 | continue; | |
222 | /* | |
223 | * !!!FIXME!!! Some BIOSen report areas as RAM that | |
224 | * are not. Notably the 640->1Mb area. We need a sanity | |
225 | * check here. | |
226 | */ | |
227 | addr = (e820.map[i].addr+PAGE_SIZE-1) >> PAGE_SHIFT; | |
228 | end = (e820.map[i].addr+e820.map[i].size) >> PAGE_SHIFT; | |
229 | if ((pagenr >= addr) && (pagenr < end)) | |
230 | return 1; | |
231 | } | |
232 | return 0; | |
233 | } | |
234 | ||
235 | #ifdef CONFIG_HIGHMEM | |
236 | pte_t *kmap_pte; | |
237 | pgprot_t kmap_prot; | |
238 | ||
239 | #define kmap_get_fixmap_pte(vaddr) \ | |
240 | pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), vaddr), (vaddr)), (vaddr)) | |
241 | ||
242 | static void __init kmap_init(void) | |
243 | { | |
244 | unsigned long kmap_vstart; | |
245 | ||
246 | /* cache the first kmap pte */ | |
247 | kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN); | |
248 | kmap_pte = kmap_get_fixmap_pte(kmap_vstart); | |
249 | ||
250 | kmap_prot = PAGE_KERNEL; | |
251 | } | |
252 | ||
253 | static void __init permanent_kmaps_init(pgd_t *pgd_base) | |
254 | { | |
255 | pgd_t *pgd; | |
256 | pud_t *pud; | |
257 | pmd_t *pmd; | |
258 | pte_t *pte; | |
259 | unsigned long vaddr; | |
260 | ||
261 | vaddr = PKMAP_BASE; | |
262 | page_table_range_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base); | |
263 | ||
264 | pgd = swapper_pg_dir + pgd_index(vaddr); | |
265 | pud = pud_offset(pgd, vaddr); | |
266 | pmd = pmd_offset(pud, vaddr); | |
267 | pte = pte_offset_kernel(pmd, vaddr); | |
268 | pkmap_page_table = pte; | |
269 | } | |
270 | ||
c09b4240 | 271 | static void __meminit free_new_highpage(struct page *page) |
05039b92 DH |
272 | { |
273 | set_page_count(page, 1); | |
274 | __free_page(page); | |
275 | totalhigh_pages++; | |
276 | } | |
277 | ||
278 | void __init add_one_highpage_init(struct page *page, int pfn, int bad_ppro) | |
1da177e4 LT |
279 | { |
280 | if (page_is_ram(pfn) && !(bad_ppro && page_kills_ppro(pfn))) { | |
281 | ClearPageReserved(page); | |
05039b92 | 282 | free_new_highpage(page); |
1da177e4 LT |
283 | } else |
284 | SetPageReserved(page); | |
285 | } | |
286 | ||
05039b92 DH |
287 | static int add_one_highpage_hotplug(struct page *page, unsigned long pfn) |
288 | { | |
289 | free_new_highpage(page); | |
290 | totalram_pages++; | |
291 | #ifdef CONFIG_FLATMEM | |
292 | max_mapnr = max(pfn, max_mapnr); | |
293 | #endif | |
294 | num_physpages++; | |
295 | return 0; | |
296 | } | |
297 | ||
298 | /* | |
299 | * Not currently handling the NUMA case. | |
300 | * Assuming single node and all memory that | |
301 | * has been added dynamically that would be | |
302 | * onlined here is in HIGHMEM | |
303 | */ | |
304 | void online_page(struct page *page) | |
305 | { | |
306 | ClearPageReserved(page); | |
307 | add_one_highpage_hotplug(page, page_to_pfn(page)); | |
308 | } | |
309 | ||
310 | ||
05b79bdc AW |
311 | #ifdef CONFIG_NUMA |
312 | extern void set_highmem_pages_init(int); | |
313 | #else | |
1da177e4 LT |
314 | static void __init set_highmem_pages_init(int bad_ppro) |
315 | { | |
316 | int pfn; | |
317 | for (pfn = highstart_pfn; pfn < highend_pfn; pfn++) | |
05039b92 | 318 | add_one_highpage_init(pfn_to_page(pfn), pfn, bad_ppro); |
1da177e4 LT |
319 | totalram_pages += totalhigh_pages; |
320 | } | |
05b79bdc | 321 | #endif /* CONFIG_FLATMEM */ |
1da177e4 LT |
322 | |
323 | #else | |
324 | #define kmap_init() do { } while (0) | |
325 | #define permanent_kmaps_init(pgd_base) do { } while (0) | |
326 | #define set_highmem_pages_init(bad_ppro) do { } while (0) | |
327 | #endif /* CONFIG_HIGHMEM */ | |
328 | ||
329 | unsigned long long __PAGE_KERNEL = _PAGE_KERNEL; | |
129f6946 | 330 | EXPORT_SYMBOL(__PAGE_KERNEL); |
1da177e4 LT |
331 | unsigned long long __PAGE_KERNEL_EXEC = _PAGE_KERNEL_EXEC; |
332 | ||
05b79bdc | 333 | #ifdef CONFIG_NUMA |
1da177e4 | 334 | extern void __init remap_numa_kva(void); |
05b79bdc AW |
335 | #else |
336 | #define remap_numa_kva() do {} while (0) | |
1da177e4 LT |
337 | #endif |
338 | ||
339 | static void __init pagetable_init (void) | |
340 | { | |
341 | unsigned long vaddr; | |
342 | pgd_t *pgd_base = swapper_pg_dir; | |
343 | ||
344 | #ifdef CONFIG_X86_PAE | |
345 | int i; | |
346 | /* Init entries of the first-level page table to the zero page */ | |
347 | for (i = 0; i < PTRS_PER_PGD; i++) | |
348 | set_pgd(pgd_base + i, __pgd(__pa(empty_zero_page) | _PAGE_PRESENT)); | |
349 | #endif | |
350 | ||
351 | /* Enable PSE if available */ | |
352 | if (cpu_has_pse) { | |
353 | set_in_cr4(X86_CR4_PSE); | |
354 | } | |
355 | ||
356 | /* Enable PGE if available */ | |
357 | if (cpu_has_pge) { | |
358 | set_in_cr4(X86_CR4_PGE); | |
359 | __PAGE_KERNEL |= _PAGE_GLOBAL; | |
360 | __PAGE_KERNEL_EXEC |= _PAGE_GLOBAL; | |
361 | } | |
362 | ||
363 | kernel_physical_mapping_init(pgd_base); | |
364 | remap_numa_kva(); | |
365 | ||
366 | /* | |
367 | * Fixed mappings, only the page table structure has to be | |
368 | * created - mappings will be set by set_fixmap(): | |
369 | */ | |
370 | vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK; | |
371 | page_table_range_init(vaddr, 0, pgd_base); | |
372 | ||
373 | permanent_kmaps_init(pgd_base); | |
374 | ||
375 | #ifdef CONFIG_X86_PAE | |
376 | /* | |
377 | * Add low memory identity-mappings - SMP needs it when | |
378 | * starting up on an AP from real-mode. In the non-PAE | |
379 | * case we already have these mappings through head.S. | |
380 | * All user-space mappings are explicitly cleared after | |
381 | * SMP startup. | |
382 | */ | |
c9b02a24 | 383 | set_pgd(&pgd_base[0], pgd_base[USER_PTRS_PER_PGD]); |
1da177e4 LT |
384 | #endif |
385 | } | |
386 | ||
648be318 | 387 | #ifdef CONFIG_SOFTWARE_SUSPEND |
1da177e4 LT |
388 | /* |
389 | * Swap suspend & friends need this for resume because things like the intel-agp | |
390 | * driver might have split up a kernel 4MB mapping. | |
391 | */ | |
392 | char __nosavedata swsusp_pg_dir[PAGE_SIZE] | |
393 | __attribute__ ((aligned (PAGE_SIZE))); | |
394 | ||
395 | static inline void save_pg_dir(void) | |
396 | { | |
397 | memcpy(swsusp_pg_dir, swapper_pg_dir, PAGE_SIZE); | |
398 | } | |
399 | #else | |
400 | static inline void save_pg_dir(void) | |
401 | { | |
402 | } | |
403 | #endif | |
404 | ||
405 | void zap_low_mappings (void) | |
406 | { | |
407 | int i; | |
408 | ||
409 | save_pg_dir(); | |
410 | ||
411 | /* | |
412 | * Zap initial low-memory mappings. | |
413 | * | |
414 | * Note that "pgd_clear()" doesn't do it for | |
415 | * us, because pgd_clear() is a no-op on i386. | |
416 | */ | |
417 | for (i = 0; i < USER_PTRS_PER_PGD; i++) | |
418 | #ifdef CONFIG_X86_PAE | |
419 | set_pgd(swapper_pg_dir+i, __pgd(1 + __pa(empty_zero_page))); | |
420 | #else | |
421 | set_pgd(swapper_pg_dir+i, __pgd(0)); | |
422 | #endif | |
423 | flush_tlb_all(); | |
424 | } | |
425 | ||
426 | static int disable_nx __initdata = 0; | |
6c231b7b | 427 | u64 __supported_pte_mask __read_mostly = ~_PAGE_NX; |
1da177e4 LT |
428 | |
429 | /* | |
430 | * noexec = on|off | |
431 | * | |
432 | * Control non executable mappings. | |
433 | * | |
434 | * on Enable | |
435 | * off Disable | |
436 | */ | |
437 | void __init noexec_setup(const char *str) | |
438 | { | |
439 | if (!strncmp(str, "on",2) && cpu_has_nx) { | |
440 | __supported_pte_mask |= _PAGE_NX; | |
441 | disable_nx = 0; | |
442 | } else if (!strncmp(str,"off",3)) { | |
443 | disable_nx = 1; | |
444 | __supported_pte_mask &= ~_PAGE_NX; | |
445 | } | |
446 | } | |
447 | ||
448 | int nx_enabled = 0; | |
449 | #ifdef CONFIG_X86_PAE | |
450 | ||
451 | static void __init set_nx(void) | |
452 | { | |
453 | unsigned int v[4], l, h; | |
454 | ||
455 | if (cpu_has_pae && (cpuid_eax(0x80000000) > 0x80000001)) { | |
456 | cpuid(0x80000001, &v[0], &v[1], &v[2], &v[3]); | |
457 | if ((v[3] & (1 << 20)) && !disable_nx) { | |
458 | rdmsr(MSR_EFER, l, h); | |
459 | l |= EFER_NX; | |
460 | wrmsr(MSR_EFER, l, h); | |
461 | nx_enabled = 1; | |
462 | __supported_pte_mask |= _PAGE_NX; | |
463 | } | |
464 | } | |
465 | } | |
466 | ||
467 | /* | |
468 | * Enables/disables executability of a given kernel page and | |
469 | * returns the previous setting. | |
470 | */ | |
471 | int __init set_kernel_exec(unsigned long vaddr, int enable) | |
472 | { | |
473 | pte_t *pte; | |
474 | int ret = 1; | |
475 | ||
476 | if (!nx_enabled) | |
477 | goto out; | |
478 | ||
479 | pte = lookup_address(vaddr); | |
480 | BUG_ON(!pte); | |
481 | ||
482 | if (!pte_exec_kernel(*pte)) | |
483 | ret = 0; | |
484 | ||
485 | if (enable) | |
486 | pte->pte_high &= ~(1 << (_PAGE_BIT_NX - 32)); | |
487 | else | |
488 | pte->pte_high |= 1 << (_PAGE_BIT_NX - 32); | |
489 | __flush_tlb_all(); | |
490 | out: | |
491 | return ret; | |
492 | } | |
493 | ||
494 | #endif | |
495 | ||
496 | /* | |
497 | * paging_init() sets up the page tables - note that the first 8MB are | |
498 | * already mapped by head.S. | |
499 | * | |
500 | * This routines also unmaps the page at virtual kernel address 0, so | |
501 | * that we can trap those pesky NULL-reference errors in the kernel. | |
502 | */ | |
503 | void __init paging_init(void) | |
504 | { | |
505 | #ifdef CONFIG_X86_PAE | |
506 | set_nx(); | |
507 | if (nx_enabled) | |
508 | printk("NX (Execute Disable) protection: active\n"); | |
509 | #endif | |
510 | ||
511 | pagetable_init(); | |
512 | ||
513 | load_cr3(swapper_pg_dir); | |
514 | ||
515 | #ifdef CONFIG_X86_PAE | |
516 | /* | |
517 | * We will bail out later - printk doesn't work right now so | |
518 | * the user would just see a hanging kernel. | |
519 | */ | |
520 | if (cpu_has_pae) | |
521 | set_in_cr4(X86_CR4_PAE); | |
522 | #endif | |
523 | __flush_tlb_all(); | |
524 | ||
525 | kmap_init(); | |
526 | } | |
527 | ||
528 | /* | |
529 | * Test if the WP bit works in supervisor mode. It isn't supported on 386's | |
530 | * and also on some strange 486's (NexGen etc.). All 586+'s are OK. This | |
531 | * used to involve black magic jumps to work around some nasty CPU bugs, | |
532 | * but fortunately the switch to using exceptions got rid of all that. | |
533 | */ | |
534 | ||
535 | static void __init test_wp_bit(void) | |
536 | { | |
537 | printk("Checking if this processor honours the WP bit even in supervisor mode... "); | |
538 | ||
539 | /* Any page-aligned address will do, the test is non-destructive */ | |
540 | __set_fixmap(FIX_WP_TEST, __pa(&swapper_pg_dir), PAGE_READONLY); | |
541 | boot_cpu_data.wp_works_ok = do_test_wp_bit(); | |
542 | clear_fixmap(FIX_WP_TEST); | |
543 | ||
544 | if (!boot_cpu_data.wp_works_ok) { | |
545 | printk("No.\n"); | |
546 | #ifdef CONFIG_X86_WP_WORKS_OK | |
547 | panic("This kernel doesn't support CPU's with broken WP. Recompile it for a 386!"); | |
548 | #endif | |
549 | } else { | |
550 | printk("Ok.\n"); | |
551 | } | |
552 | } | |
553 | ||
554 | static void __init set_max_mapnr_init(void) | |
555 | { | |
556 | #ifdef CONFIG_HIGHMEM | |
557 | num_physpages = highend_pfn; | |
558 | #else | |
559 | num_physpages = max_low_pfn; | |
560 | #endif | |
05b79bdc | 561 | #ifdef CONFIG_FLATMEM |
1da177e4 LT |
562 | max_mapnr = num_physpages; |
563 | #endif | |
564 | } | |
565 | ||
566 | static struct kcore_list kcore_mem, kcore_vmalloc; | |
567 | ||
568 | void __init mem_init(void) | |
569 | { | |
570 | extern int ppro_with_ram_bug(void); | |
571 | int codesize, reservedpages, datasize, initsize; | |
572 | int tmp; | |
573 | int bad_ppro; | |
574 | ||
05b79bdc | 575 | #ifdef CONFIG_FLATMEM |
1da177e4 LT |
576 | if (!mem_map) |
577 | BUG(); | |
578 | #endif | |
579 | ||
580 | bad_ppro = ppro_with_ram_bug(); | |
581 | ||
582 | #ifdef CONFIG_HIGHMEM | |
583 | /* check that fixmap and pkmap do not overlap */ | |
584 | if (PKMAP_BASE+LAST_PKMAP*PAGE_SIZE >= FIXADDR_START) { | |
585 | printk(KERN_ERR "fixmap and kmap areas overlap - this will crash\n"); | |
586 | printk(KERN_ERR "pkstart: %lxh pkend: %lxh fixstart %lxh\n", | |
587 | PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE, FIXADDR_START); | |
588 | BUG(); | |
589 | } | |
590 | #endif | |
591 | ||
592 | set_max_mapnr_init(); | |
593 | ||
594 | #ifdef CONFIG_HIGHMEM | |
595 | high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1; | |
596 | #else | |
597 | high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1; | |
598 | #endif | |
599 | ||
600 | /* this will put all low memory onto the freelists */ | |
601 | totalram_pages += free_all_bootmem(); | |
602 | ||
603 | reservedpages = 0; | |
604 | for (tmp = 0; tmp < max_low_pfn; tmp++) | |
605 | /* | |
606 | * Only count reserved RAM pages | |
607 | */ | |
608 | if (page_is_ram(tmp) && PageReserved(pfn_to_page(tmp))) | |
609 | reservedpages++; | |
610 | ||
611 | set_highmem_pages_init(bad_ppro); | |
612 | ||
613 | codesize = (unsigned long) &_etext - (unsigned long) &_text; | |
614 | datasize = (unsigned long) &_edata - (unsigned long) &_etext; | |
615 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; | |
616 | ||
617 | kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT); | |
618 | kclist_add(&kcore_vmalloc, (void *)VMALLOC_START, | |
619 | VMALLOC_END-VMALLOC_START); | |
620 | ||
621 | printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init, %ldk highmem)\n", | |
622 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), | |
623 | num_physpages << (PAGE_SHIFT-10), | |
624 | codesize >> 10, | |
625 | reservedpages << (PAGE_SHIFT-10), | |
626 | datasize >> 10, | |
627 | initsize >> 10, | |
628 | (unsigned long) (totalhigh_pages << (PAGE_SHIFT-10)) | |
629 | ); | |
630 | ||
631 | #ifdef CONFIG_X86_PAE | |
632 | if (!cpu_has_pae) | |
633 | panic("cannot execute a PAE-enabled kernel on a PAE-less CPU!"); | |
634 | #endif | |
635 | if (boot_cpu_data.wp_works_ok < 0) | |
636 | test_wp_bit(); | |
637 | ||
638 | /* | |
639 | * Subtle. SMP is doing it's boot stuff late (because it has to | |
640 | * fork idle threads) - but it also needs low mappings for the | |
641 | * protected-mode entry to work. We zap these entries only after | |
642 | * the WP-bit has been tested. | |
643 | */ | |
644 | #ifndef CONFIG_SMP | |
645 | zap_low_mappings(); | |
646 | #endif | |
647 | } | |
648 | ||
05039b92 DH |
649 | /* |
650 | * this is for the non-NUMA, single node SMP system case. | |
651 | * Specifically, in the case of x86, we will always add | |
652 | * memory to the highmem for now. | |
653 | */ | |
654 | #ifndef CONFIG_NEED_MULTIPLE_NODES | |
655 | int add_memory(u64 start, u64 size) | |
656 | { | |
657 | struct pglist_data *pgdata = &contig_page_data; | |
658 | struct zone *zone = pgdata->node_zones + MAX_NR_ZONES-1; | |
659 | unsigned long start_pfn = start >> PAGE_SHIFT; | |
660 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
661 | ||
662 | return __add_pages(zone, start_pfn, nr_pages); | |
663 | } | |
664 | ||
665 | int remove_memory(u64 start, u64 size) | |
666 | { | |
667 | return -EINVAL; | |
668 | } | |
669 | #endif | |
670 | ||
1da177e4 LT |
671 | kmem_cache_t *pgd_cache; |
672 | kmem_cache_t *pmd_cache; | |
673 | ||
674 | void __init pgtable_cache_init(void) | |
675 | { | |
676 | if (PTRS_PER_PMD > 1) { | |
677 | pmd_cache = kmem_cache_create("pmd", | |
678 | PTRS_PER_PMD*sizeof(pmd_t), | |
679 | PTRS_PER_PMD*sizeof(pmd_t), | |
680 | 0, | |
681 | pmd_ctor, | |
682 | NULL); | |
683 | if (!pmd_cache) | |
684 | panic("pgtable_cache_init(): cannot create pmd cache"); | |
685 | } | |
686 | pgd_cache = kmem_cache_create("pgd", | |
687 | PTRS_PER_PGD*sizeof(pgd_t), | |
688 | PTRS_PER_PGD*sizeof(pgd_t), | |
689 | 0, | |
690 | pgd_ctor, | |
691 | PTRS_PER_PMD == 1 ? pgd_dtor : NULL); | |
692 | if (!pgd_cache) | |
693 | panic("pgtable_cache_init(): Cannot create pgd cache"); | |
694 | } | |
695 | ||
696 | /* | |
697 | * This function cannot be __init, since exceptions don't work in that | |
698 | * section. Put this after the callers, so that it cannot be inlined. | |
699 | */ | |
700 | static int noinline do_test_wp_bit(void) | |
701 | { | |
702 | char tmp_reg; | |
703 | int flag; | |
704 | ||
705 | __asm__ __volatile__( | |
706 | " movb %0,%1 \n" | |
707 | "1: movb %1,%0 \n" | |
708 | " xorl %2,%2 \n" | |
709 | "2: \n" | |
710 | ".section __ex_table,\"a\"\n" | |
711 | " .align 4 \n" | |
712 | " .long 1b,2b \n" | |
713 | ".previous \n" | |
714 | :"=m" (*(char *)fix_to_virt(FIX_WP_TEST)), | |
715 | "=q" (tmp_reg), | |
716 | "=r" (flag) | |
717 | :"2" (1) | |
718 | :"memory"); | |
719 | ||
720 | return flag; | |
721 | } | |
722 | ||
723 | void free_initmem(void) | |
724 | { | |
725 | unsigned long addr; | |
726 | ||
727 | addr = (unsigned long)(&__init_begin); | |
728 | for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) { | |
729 | ClearPageReserved(virt_to_page(addr)); | |
730 | set_page_count(virt_to_page(addr), 1); | |
731 | memset((void *)addr, 0xcc, PAGE_SIZE); | |
732 | free_page(addr); | |
733 | totalram_pages++; | |
734 | } | |
735 | printk (KERN_INFO "Freeing unused kernel memory: %dk freed\n", (__init_end - __init_begin) >> 10); | |
736 | } | |
737 | ||
63aaf308 AV |
738 | #ifdef CONFIG_DEBUG_RODATA |
739 | ||
740 | extern char __start_rodata, __end_rodata; | |
741 | void mark_rodata_ro(void) | |
742 | { | |
743 | unsigned long addr = (unsigned long)&__start_rodata; | |
744 | ||
745 | for (; addr < (unsigned long)&__end_rodata; addr += PAGE_SIZE) | |
746 | change_page_attr(virt_to_page(addr), 1, PAGE_KERNEL_RO); | |
747 | ||
748 | printk ("Write protecting the kernel read-only data: %luk\n", | |
749 | (unsigned long)(&__end_rodata - &__start_rodata) >> 10); | |
750 | ||
751 | /* | |
752 | * change_page_attr() requires a global_flush_tlb() call after it. | |
753 | * We do this after the printk so that if something went wrong in the | |
754 | * change, the printk gets out at least to give a better debug hint | |
755 | * of who is the culprit. | |
756 | */ | |
757 | global_flush_tlb(); | |
758 | } | |
759 | #endif | |
760 | ||
761 | ||
1da177e4 LT |
762 | #ifdef CONFIG_BLK_DEV_INITRD |
763 | void free_initrd_mem(unsigned long start, unsigned long end) | |
764 | { | |
765 | if (start < end) | |
766 | printk (KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10); | |
767 | for (; start < end; start += PAGE_SIZE) { | |
768 | ClearPageReserved(virt_to_page(start)); | |
769 | set_page_count(virt_to_page(start), 1); | |
770 | free_page(start); | |
771 | totalram_pages++; | |
772 | } | |
773 | } | |
774 | #endif |