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Commit | Line | Data |
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114069f7 | 1 | /* |
009ec2a9 | 2 | * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
1da177e4 LT |
3 | * Licensed under the GPL |
4 | */ | |
5 | ||
009ec2a9 | 6 | #include <linux/stddef.h> |
73395a00 | 7 | #include <linux/module.h> |
009ec2a9 | 8 | #include <linux/bootmem.h> |
009ec2a9 JD |
9 | #include <linux/highmem.h> |
10 | #include <linux/mm.h> | |
11 | #include <linux/swap.h> | |
5a0e3ad6 | 12 | #include <linux/slab.h> |
009ec2a9 JD |
13 | #include <asm/fixmap.h> |
14 | #include <asm/page.h> | |
37185b33 AV |
15 | #include <as-layout.h> |
16 | #include <init.h> | |
17 | #include <kern.h> | |
18 | #include <kern_util.h> | |
19 | #include <mem_user.h> | |
20 | #include <os.h> | |
1da177e4 | 21 | |
6bf79482 | 22 | /* allocated in paging_init, zeroed in mem_init, and unchanged thereafter */ |
1da177e4 | 23 | unsigned long *empty_zero_page = NULL; |
73395a00 | 24 | EXPORT_SYMBOL(empty_zero_page); |
6bf79482 | 25 | /* allocated in paging_init and unchanged thereafter */ |
4a567582 | 26 | static unsigned long *empty_bad_page = NULL; |
80e39311 JD |
27 | |
28 | /* | |
29 | * Initialized during boot, and readonly for initializing page tables | |
30 | * afterwards | |
31 | */ | |
1da177e4 | 32 | pgd_t swapper_pg_dir[PTRS_PER_PGD]; |
80e39311 JD |
33 | |
34 | /* Initialized at boot time, and readonly after that */ | |
9902abd7 | 35 | unsigned long long highmem; |
1da177e4 LT |
36 | int kmalloc_ok = 0; |
37 | ||
80e39311 | 38 | /* Used during early boot */ |
1da177e4 LT |
39 | static unsigned long brk_end; |
40 | ||
1da177e4 LT |
41 | #ifdef CONFIG_HIGHMEM |
42 | static void setup_highmem(unsigned long highmem_start, | |
43 | unsigned long highmem_len) | |
44 | { | |
1da177e4 LT |
45 | unsigned long highmem_pfn; |
46 | int i; | |
47 | ||
48 | highmem_pfn = __pa(highmem_start) >> PAGE_SHIFT; | |
5b472b20 JL |
49 | for (i = 0; i < highmem_len >> PAGE_SHIFT; i++) |
50 | free_highmem_page(&mem_map[highmem_pfn + i]); | |
1da177e4 LT |
51 | } |
52 | #endif | |
53 | ||
97a1fcbb | 54 | void __init mem_init(void) |
1da177e4 | 55 | { |
60678bbc | 56 | /* clear the zero-page */ |
c0a9290e | 57 | memset(empty_zero_page, 0, PAGE_SIZE); |
1da177e4 LT |
58 | |
59 | /* Map in the area just after the brk now that kmalloc is about | |
60 | * to be turned on. | |
61 | */ | |
62 | brk_end = (unsigned long) UML_ROUND_UP(sbrk(0)); | |
ab26a527 | 63 | map_memory(brk_end, __pa(brk_end), uml_reserved - brk_end, 1, 1, 0); |
1da177e4 LT |
64 | free_bootmem(__pa(brk_end), uml_reserved - brk_end); |
65 | uml_reserved = brk_end; | |
66 | ||
1da177e4 | 67 | /* this will put all low memory onto the freelists */ |
0c988534 | 68 | free_all_bootmem(); |
af84eab2 | 69 | max_low_pfn = totalram_pages; |
c1f60a5a | 70 | #ifdef CONFIG_HIGHMEM |
5b472b20 | 71 | setup_highmem(end_iomem, highmem); |
c1f60a5a | 72 | #endif |
1da177e4 | 73 | max_pfn = totalram_pages; |
715ee356 | 74 | mem_init_print_info(NULL); |
1da177e4 | 75 | kmalloc_ok = 1; |
1da177e4 LT |
76 | } |
77 | ||
12f49643 JD |
78 | /* |
79 | * Create a page table and place a pointer to it in a middle page | |
80 | * directory entry. | |
81 | */ | |
82 | static void __init one_page_table_init(pmd_t *pmd) | |
83 | { | |
84 | if (pmd_none(*pmd)) { | |
85 | pte_t *pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE); | |
86 | set_pmd(pmd, __pmd(_KERNPG_TABLE + | |
87 | (unsigned long) __pa(pte))); | |
88 | if (pte != pte_offset_kernel(pmd, 0)) | |
89 | BUG(); | |
90 | } | |
91 | } | |
92 | ||
93 | static void __init one_md_table_init(pud_t *pud) | |
94 | { | |
95 | #ifdef CONFIG_3_LEVEL_PGTABLES | |
96 | pmd_t *pmd_table = (pmd_t *) alloc_bootmem_low_pages(PAGE_SIZE); | |
97 | set_pud(pud, __pud(_KERNPG_TABLE + (unsigned long) __pa(pmd_table))); | |
98 | if (pmd_table != pmd_offset(pud, 0)) | |
99 | BUG(); | |
100 | #endif | |
101 | } | |
102 | ||
009ec2a9 | 103 | static void __init fixrange_init(unsigned long start, unsigned long end, |
1da177e4 LT |
104 | pgd_t *pgd_base) |
105 | { | |
106 | pgd_t *pgd; | |
12f49643 | 107 | pud_t *pud; |
1da177e4 | 108 | pmd_t *pmd; |
1da177e4 LT |
109 | int i, j; |
110 | unsigned long vaddr; | |
111 | ||
112 | vaddr = start; | |
113 | i = pgd_index(vaddr); | |
114 | j = pmd_index(vaddr); | |
115 | pgd = pgd_base + i; | |
116 | ||
117 | for ( ; (i < PTRS_PER_PGD) && (vaddr < end); pgd++, i++) { | |
12f49643 JD |
118 | pud = pud_offset(pgd, vaddr); |
119 | if (pud_none(*pud)) | |
120 | one_md_table_init(pud); | |
121 | pmd = pmd_offset(pud, vaddr); | |
655e4ed0 | 122 | for (; (j < PTRS_PER_PMD) && (vaddr < end); pmd++, j++) { |
12f49643 | 123 | one_page_table_init(pmd); |
1da177e4 LT |
124 | vaddr += PMD_SIZE; |
125 | } | |
126 | j = 0; | |
127 | } | |
128 | } | |
129 | ||
130 | #ifdef CONFIG_HIGHMEM | |
131 | pte_t *kmap_pte; | |
132 | pgprot_t kmap_prot; | |
133 | ||
134 | #define kmap_get_fixmap_pte(vaddr) \ | |
135 | pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), (vaddr)),\ | |
8192ab42 | 136 | (vaddr)), (vaddr)) |
1da177e4 LT |
137 | |
138 | static void __init kmap_init(void) | |
139 | { | |
140 | unsigned long kmap_vstart; | |
141 | ||
142 | /* cache the first kmap pte */ | |
143 | kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN); | |
144 | kmap_pte = kmap_get_fixmap_pte(kmap_vstart); | |
145 | ||
146 | kmap_prot = PAGE_KERNEL; | |
147 | } | |
148 | ||
b4a08a10 | 149 | static void __init init_highmem(void) |
1da177e4 LT |
150 | { |
151 | pgd_t *pgd; | |
152 | pud_t *pud; | |
153 | pmd_t *pmd; | |
154 | pte_t *pte; | |
155 | unsigned long vaddr; | |
156 | ||
157 | /* | |
158 | * Permanent kmaps: | |
159 | */ | |
160 | vaddr = PKMAP_BASE; | |
161 | fixrange_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, swapper_pg_dir); | |
162 | ||
163 | pgd = swapper_pg_dir + pgd_index(vaddr); | |
164 | pud = pud_offset(pgd, vaddr); | |
165 | pmd = pmd_offset(pud, vaddr); | |
166 | pte = pte_offset_kernel(pmd, vaddr); | |
167 | pkmap_page_table = pte; | |
168 | ||
169 | kmap_init(); | |
170 | } | |
171 | #endif /* CONFIG_HIGHMEM */ | |
172 | ||
173 | static void __init fixaddr_user_init( void) | |
174 | { | |
9a0b3869 | 175 | #ifdef CONFIG_ARCH_REUSE_HOST_VSYSCALL_AREA |
1da177e4 LT |
176 | long size = FIXADDR_USER_END - FIXADDR_USER_START; |
177 | pgd_t *pgd; | |
178 | pud_t *pud; | |
179 | pmd_t *pmd; | |
180 | pte_t *pte; | |
655e4ed0 JD |
181 | phys_t p; |
182 | unsigned long v, vaddr = FIXADDR_USER_START; | |
1da177e4 | 183 | |
655e4ed0 | 184 | if (!size) |
1da177e4 LT |
185 | return; |
186 | ||
187 | fixrange_init( FIXADDR_USER_START, FIXADDR_USER_END, swapper_pg_dir); | |
655e4ed0 JD |
188 | v = (unsigned long) alloc_bootmem_low_pages(size); |
189 | memcpy((void *) v , (void *) FIXADDR_USER_START, size); | |
190 | p = __pa(v); | |
009ec2a9 | 191 | for ( ; size > 0; size -= PAGE_SIZE, vaddr += PAGE_SIZE, |
655e4ed0 | 192 | p += PAGE_SIZE) { |
1da177e4 LT |
193 | pgd = swapper_pg_dir + pgd_index(vaddr); |
194 | pud = pud_offset(pgd, vaddr); | |
195 | pmd = pmd_offset(pud, vaddr); | |
196 | pte = pte_offset_kernel(pmd, vaddr); | |
655e4ed0 | 197 | pte_set_val(*pte, p, PAGE_READONLY); |
1da177e4 LT |
198 | } |
199 | #endif | |
200 | } | |
201 | ||
36e45463 | 202 | void __init paging_init(void) |
1da177e4 LT |
203 | { |
204 | unsigned long zones_size[MAX_NR_ZONES], vaddr; | |
205 | int i; | |
206 | ||
207 | empty_zero_page = (unsigned long *) alloc_bootmem_low_pages(PAGE_SIZE); | |
208 | empty_bad_page = (unsigned long *) alloc_bootmem_low_pages(PAGE_SIZE); | |
009ec2a9 | 209 | for (i = 0; i < ARRAY_SIZE(zones_size); i++) |
1da177e4 | 210 | zones_size[i] = 0; |
91b165c0 | 211 | |
0715501b JD |
212 | zones_size[ZONE_NORMAL] = (end_iomem >> PAGE_SHIFT) - |
213 | (uml_physmem >> PAGE_SHIFT); | |
e53ef38d | 214 | #ifdef CONFIG_HIGHMEM |
353f8d1c | 215 | zones_size[ZONE_HIGHMEM] = highmem >> PAGE_SHIFT; |
e53ef38d | 216 | #endif |
1da177e4 LT |
217 | free_area_init(zones_size); |
218 | ||
219 | /* | |
220 | * Fixed mappings, only the page table structure has to be | |
221 | * created - mappings will be set by set_fixmap(): | |
222 | */ | |
223 | vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK; | |
224 | fixrange_init(vaddr, FIXADDR_TOP, swapper_pg_dir); | |
225 | ||
226 | fixaddr_user_init(); | |
227 | ||
228 | #ifdef CONFIG_HIGHMEM | |
229 | init_highmem(); | |
230 | #endif | |
231 | } | |
232 | ||
8192ab42 JD |
233 | /* |
234 | * This can't do anything because nothing in the kernel image can be freed | |
1da177e4 LT |
235 | * since it's not in kernel physical memory. |
236 | */ | |
237 | ||
238 | void free_initmem(void) | |
239 | { | |
240 | } | |
241 | ||
242 | #ifdef CONFIG_BLK_DEV_INITRD | |
1da177e4 LT |
243 | void free_initrd_mem(unsigned long start, unsigned long end) |
244 | { | |
dbe67df4 | 245 | free_reserved_area((void *)start, (void *)end, -1, "initrd"); |
1da177e4 | 246 | } |
1da177e4 LT |
247 | #endif |
248 | ||
8192ab42 | 249 | /* Allocate and free page tables. */ |
1da177e4 LT |
250 | |
251 | pgd_t *pgd_alloc(struct mm_struct *mm) | |
252 | { | |
253 | pgd_t *pgd = (pgd_t *)__get_free_page(GFP_KERNEL); | |
254 | ||
255 | if (pgd) { | |
256 | memset(pgd, 0, USER_PTRS_PER_PGD * sizeof(pgd_t)); | |
009ec2a9 JD |
257 | memcpy(pgd + USER_PTRS_PER_PGD, |
258 | swapper_pg_dir + USER_PTRS_PER_PGD, | |
1da177e4 LT |
259 | (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t)); |
260 | } | |
261 | return pgd; | |
262 | } | |
263 | ||
5e541973 | 264 | void pgd_free(struct mm_struct *mm, pgd_t *pgd) |
1da177e4 LT |
265 | { |
266 | free_page((unsigned long) pgd); | |
267 | } | |
268 | ||
269 | pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address) | |
270 | { | |
271 | pte_t *pte; | |
272 | ||
273 | pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO); | |
274 | return pte; | |
275 | } | |
276 | ||
2f569afd | 277 | pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address) |
1da177e4 LT |
278 | { |
279 | struct page *pte; | |
60678bbc | 280 | |
1da177e4 | 281 | pte = alloc_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO); |
647f884e KS |
282 | if (!pte) |
283 | return NULL; | |
284 | if (!pgtable_page_ctor(pte)) { | |
285 | __free_page(pte); | |
286 | return NULL; | |
287 | } | |
1da177e4 LT |
288 | return pte; |
289 | } | |
8192ab42 JD |
290 | |
291 | #ifdef CONFIG_3_LEVEL_PGTABLES | |
292 | pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address) | |
293 | { | |
294 | pmd_t *pmd = (pmd_t *) __get_free_page(GFP_KERNEL); | |
295 | ||
296 | if (pmd) | |
297 | memset(pmd, 0, PAGE_SIZE); | |
298 | ||
299 | return pmd; | |
300 | } | |
301 | #endif | |
43f5b308 JD |
302 | |
303 | void *uml_kmalloc(int size, int flags) | |
304 | { | |
305 | return kmalloc(size, flags); | |
306 | } |