Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/arch/i386/mm/pgtable.c | |
3 | */ | |
4 | ||
5 | #include <linux/config.h> | |
6 | #include <linux/sched.h> | |
7 | #include <linux/kernel.h> | |
8 | #include <linux/errno.h> | |
9 | #include <linux/mm.h> | |
10 | #include <linux/swap.h> | |
11 | #include <linux/smp.h> | |
12 | #include <linux/highmem.h> | |
13 | #include <linux/slab.h> | |
14 | #include <linux/pagemap.h> | |
15 | #include <linux/spinlock.h> | |
16 | ||
17 | #include <asm/system.h> | |
18 | #include <asm/pgtable.h> | |
19 | #include <asm/pgalloc.h> | |
20 | #include <asm/fixmap.h> | |
21 | #include <asm/e820.h> | |
22 | #include <asm/tlb.h> | |
23 | #include <asm/tlbflush.h> | |
24 | ||
25 | void show_mem(void) | |
26 | { | |
27 | int total = 0, reserved = 0; | |
28 | int shared = 0, cached = 0; | |
29 | int highmem = 0; | |
30 | struct page *page; | |
31 | pg_data_t *pgdat; | |
32 | unsigned long i; | |
6f4e1e50 | 33 | struct page_state ps; |
208d54e5 | 34 | unsigned long flags; |
1da177e4 | 35 | |
f90e7185 | 36 | printk(KERN_INFO "Mem-info:\n"); |
1da177e4 | 37 | show_free_areas(); |
f90e7185 | 38 | printk(KERN_INFO "Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); |
ec936fc5 | 39 | for_each_online_pgdat(pgdat) { |
208d54e5 | 40 | pgdat_resize_lock(pgdat, &flags); |
1da177e4 | 41 | for (i = 0; i < pgdat->node_spanned_pages; ++i) { |
408fde81 | 42 | page = pgdat_page_nr(pgdat, i); |
1da177e4 LT |
43 | total++; |
44 | if (PageHighMem(page)) | |
45 | highmem++; | |
46 | if (PageReserved(page)) | |
47 | reserved++; | |
48 | else if (PageSwapCache(page)) | |
49 | cached++; | |
50 | else if (page_count(page)) | |
51 | shared += page_count(page) - 1; | |
52 | } | |
208d54e5 | 53 | pgdat_resize_unlock(pgdat, &flags); |
1da177e4 | 54 | } |
f90e7185 CL |
55 | printk(KERN_INFO "%d pages of RAM\n", total); |
56 | printk(KERN_INFO "%d pages of HIGHMEM\n", highmem); | |
57 | printk(KERN_INFO "%d reserved pages\n", reserved); | |
58 | printk(KERN_INFO "%d pages shared\n", shared); | |
59 | printk(KERN_INFO "%d pages swap cached\n", cached); | |
6f4e1e50 MB |
60 | |
61 | get_page_state(&ps); | |
f90e7185 CL |
62 | printk(KERN_INFO "%lu pages dirty\n", ps.nr_dirty); |
63 | printk(KERN_INFO "%lu pages writeback\n", ps.nr_writeback); | |
65ba55f5 | 64 | printk(KERN_INFO "%lu pages mapped\n", global_page_state(NR_FILE_MAPPED)); |
f90e7185 CL |
65 | printk(KERN_INFO "%lu pages slab\n", ps.nr_slab); |
66 | printk(KERN_INFO "%lu pages pagetables\n", ps.nr_page_table_pages); | |
1da177e4 LT |
67 | } |
68 | ||
69 | /* | |
70 | * Associate a virtual page frame with a given physical page frame | |
71 | * and protection flags for that frame. | |
72 | */ | |
73 | static void set_pte_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags) | |
74 | { | |
75 | pgd_t *pgd; | |
76 | pud_t *pud; | |
77 | pmd_t *pmd; | |
78 | pte_t *pte; | |
79 | ||
80 | pgd = swapper_pg_dir + pgd_index(vaddr); | |
81 | if (pgd_none(*pgd)) { | |
82 | BUG(); | |
83 | return; | |
84 | } | |
85 | pud = pud_offset(pgd, vaddr); | |
86 | if (pud_none(*pud)) { | |
87 | BUG(); | |
88 | return; | |
89 | } | |
90 | pmd = pmd_offset(pud, vaddr); | |
91 | if (pmd_none(*pmd)) { | |
92 | BUG(); | |
93 | return; | |
94 | } | |
95 | pte = pte_offset_kernel(pmd, vaddr); | |
96 | /* <pfn,flags> stored as-is, to permit clearing entries */ | |
97 | set_pte(pte, pfn_pte(pfn, flags)); | |
98 | ||
99 | /* | |
100 | * It's enough to flush this one mapping. | |
101 | * (PGE mappings get flushed as well) | |
102 | */ | |
103 | __flush_tlb_one(vaddr); | |
104 | } | |
105 | ||
106 | /* | |
107 | * Associate a large virtual page frame with a given physical page frame | |
108 | * and protection flags for that frame. pfn is for the base of the page, | |
109 | * vaddr is what the page gets mapped to - both must be properly aligned. | |
110 | * The pmd must already be instantiated. Assumes PAE mode. | |
111 | */ | |
112 | void set_pmd_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags) | |
113 | { | |
114 | pgd_t *pgd; | |
115 | pud_t *pud; | |
116 | pmd_t *pmd; | |
117 | ||
118 | if (vaddr & (PMD_SIZE-1)) { /* vaddr is misaligned */ | |
f90e7185 | 119 | printk(KERN_WARNING "set_pmd_pfn: vaddr misaligned\n"); |
1da177e4 LT |
120 | return; /* BUG(); */ |
121 | } | |
122 | if (pfn & (PTRS_PER_PTE-1)) { /* pfn is misaligned */ | |
f90e7185 | 123 | printk(KERN_WARNING "set_pmd_pfn: pfn misaligned\n"); |
1da177e4 LT |
124 | return; /* BUG(); */ |
125 | } | |
126 | pgd = swapper_pg_dir + pgd_index(vaddr); | |
127 | if (pgd_none(*pgd)) { | |
f90e7185 | 128 | printk(KERN_WARNING "set_pmd_pfn: pgd_none\n"); |
1da177e4 LT |
129 | return; /* BUG(); */ |
130 | } | |
131 | pud = pud_offset(pgd, vaddr); | |
132 | pmd = pmd_offset(pud, vaddr); | |
133 | set_pmd(pmd, pfn_pmd(pfn, flags)); | |
134 | /* | |
135 | * It's enough to flush this one mapping. | |
136 | * (PGE mappings get flushed as well) | |
137 | */ | |
138 | __flush_tlb_one(vaddr); | |
139 | } | |
140 | ||
141 | void __set_fixmap (enum fixed_addresses idx, unsigned long phys, pgprot_t flags) | |
142 | { | |
143 | unsigned long address = __fix_to_virt(idx); | |
144 | ||
145 | if (idx >= __end_of_fixed_addresses) { | |
146 | BUG(); | |
147 | return; | |
148 | } | |
149 | set_pte_pfn(address, phys >> PAGE_SHIFT, flags); | |
150 | } | |
151 | ||
152 | pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address) | |
153 | { | |
154 | return (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO); | |
155 | } | |
156 | ||
157 | struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address) | |
158 | { | |
159 | struct page *pte; | |
160 | ||
161 | #ifdef CONFIG_HIGHPTE | |
162 | pte = alloc_pages(GFP_KERNEL|__GFP_HIGHMEM|__GFP_REPEAT|__GFP_ZERO, 0); | |
163 | #else | |
164 | pte = alloc_pages(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, 0); | |
165 | #endif | |
166 | return pte; | |
167 | } | |
168 | ||
169 | void pmd_ctor(void *pmd, kmem_cache_t *cache, unsigned long flags) | |
170 | { | |
171 | memset(pmd, 0, PTRS_PER_PMD*sizeof(pmd_t)); | |
172 | } | |
173 | ||
174 | /* | |
175 | * List of all pgd's needed for non-PAE so it can invalidate entries | |
176 | * in both cached and uncached pgd's; not needed for PAE since the | |
177 | * kernel pmd is shared. If PAE were not to share the pmd a similar | |
178 | * tactic would be needed. This is essentially codepath-based locking | |
179 | * against pageattr.c; it is the unique case in which a valid change | |
180 | * of kernel pagetables can't be lazily synchronized by vmalloc faults. | |
181 | * vmalloc faults work because attached pagetables are never freed. | |
182 | * The locking scheme was chosen on the basis of manfred's | |
183 | * recommendations and having no core impact whatsoever. | |
184 | * -- wli | |
185 | */ | |
186 | DEFINE_SPINLOCK(pgd_lock); | |
187 | struct page *pgd_list; | |
188 | ||
189 | static inline void pgd_list_add(pgd_t *pgd) | |
190 | { | |
191 | struct page *page = virt_to_page(pgd); | |
192 | page->index = (unsigned long)pgd_list; | |
193 | if (pgd_list) | |
4c21e2f2 | 194 | set_page_private(pgd_list, (unsigned long)&page->index); |
1da177e4 | 195 | pgd_list = page; |
4c21e2f2 | 196 | set_page_private(page, (unsigned long)&pgd_list); |
1da177e4 LT |
197 | } |
198 | ||
199 | static inline void pgd_list_del(pgd_t *pgd) | |
200 | { | |
201 | struct page *next, **pprev, *page = virt_to_page(pgd); | |
202 | next = (struct page *)page->index; | |
4c21e2f2 | 203 | pprev = (struct page **)page_private(page); |
1da177e4 LT |
204 | *pprev = next; |
205 | if (next) | |
4c21e2f2 | 206 | set_page_private(next, (unsigned long)pprev); |
1da177e4 LT |
207 | } |
208 | ||
209 | void pgd_ctor(void *pgd, kmem_cache_t *cache, unsigned long unused) | |
210 | { | |
211 | unsigned long flags; | |
212 | ||
d7271b14 ZA |
213 | if (PTRS_PER_PMD == 1) { |
214 | memset(pgd, 0, USER_PTRS_PER_PGD*sizeof(pgd_t)); | |
1da177e4 | 215 | spin_lock_irqsave(&pgd_lock, flags); |
d7271b14 | 216 | } |
1da177e4 | 217 | |
d7271b14 | 218 | clone_pgd_range((pgd_t *)pgd + USER_PTRS_PER_PGD, |
1da177e4 | 219 | swapper_pg_dir + USER_PTRS_PER_PGD, |
d7271b14 | 220 | KERNEL_PGD_PTRS); |
1da177e4 LT |
221 | if (PTRS_PER_PMD > 1) |
222 | return; | |
223 | ||
224 | pgd_list_add(pgd); | |
225 | spin_unlock_irqrestore(&pgd_lock, flags); | |
1da177e4 LT |
226 | } |
227 | ||
228 | /* never called when PTRS_PER_PMD > 1 */ | |
229 | void pgd_dtor(void *pgd, kmem_cache_t *cache, unsigned long unused) | |
230 | { | |
231 | unsigned long flags; /* can be called from interrupt context */ | |
232 | ||
233 | spin_lock_irqsave(&pgd_lock, flags); | |
234 | pgd_list_del(pgd); | |
235 | spin_unlock_irqrestore(&pgd_lock, flags); | |
236 | } | |
237 | ||
238 | pgd_t *pgd_alloc(struct mm_struct *mm) | |
239 | { | |
240 | int i; | |
241 | pgd_t *pgd = kmem_cache_alloc(pgd_cache, GFP_KERNEL); | |
242 | ||
243 | if (PTRS_PER_PMD == 1 || !pgd) | |
244 | return pgd; | |
245 | ||
246 | for (i = 0; i < USER_PTRS_PER_PGD; ++i) { | |
247 | pmd_t *pmd = kmem_cache_alloc(pmd_cache, GFP_KERNEL); | |
248 | if (!pmd) | |
249 | goto out_oom; | |
250 | set_pgd(&pgd[i], __pgd(1 + __pa(pmd))); | |
251 | } | |
252 | return pgd; | |
253 | ||
254 | out_oom: | |
255 | for (i--; i >= 0; i--) | |
256 | kmem_cache_free(pmd_cache, (void *)__va(pgd_val(pgd[i])-1)); | |
257 | kmem_cache_free(pgd_cache, pgd); | |
258 | return NULL; | |
259 | } | |
260 | ||
261 | void pgd_free(pgd_t *pgd) | |
262 | { | |
263 | int i; | |
264 | ||
265 | /* in the PAE case user pgd entries are overwritten before usage */ | |
266 | if (PTRS_PER_PMD > 1) | |
267 | for (i = 0; i < USER_PTRS_PER_PGD; ++i) | |
268 | kmem_cache_free(pmd_cache, (void *)__va(pgd_val(pgd[i])-1)); | |
e0da382c | 269 | /* in the non-PAE case, free_pgtables() clears user pgd entries */ |
1da177e4 LT |
270 | kmem_cache_free(pgd_cache, pgd); |
271 | } |