Commit | Line | Data |
---|---|---|
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 LT |
67 | /* this will put all low memory onto the freelists */ |
68 | totalram_pages = 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 LT |
73 | num_physpages = totalram_pages; |
74 | max_pfn = totalram_pages; | |
009ec2a9 | 75 | printk(KERN_INFO "Memory: %luk available\n", |
cc013a88 | 76 | nr_free_pages() << (PAGE_SHIFT-10)); |
1da177e4 | 77 | kmalloc_ok = 1; |
1da177e4 LT |
78 | } |
79 | ||
12f49643 JD |
80 | /* |
81 | * Create a page table and place a pointer to it in a middle page | |
82 | * directory entry. | |
83 | */ | |
84 | static void __init one_page_table_init(pmd_t *pmd) | |
85 | { | |
86 | if (pmd_none(*pmd)) { | |
87 | pte_t *pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE); | |
88 | set_pmd(pmd, __pmd(_KERNPG_TABLE + | |
89 | (unsigned long) __pa(pte))); | |
90 | if (pte != pte_offset_kernel(pmd, 0)) | |
91 | BUG(); | |
92 | } | |
93 | } | |
94 | ||
95 | static void __init one_md_table_init(pud_t *pud) | |
96 | { | |
97 | #ifdef CONFIG_3_LEVEL_PGTABLES | |
98 | pmd_t *pmd_table = (pmd_t *) alloc_bootmem_low_pages(PAGE_SIZE); | |
99 | set_pud(pud, __pud(_KERNPG_TABLE + (unsigned long) __pa(pmd_table))); | |
100 | if (pmd_table != pmd_offset(pud, 0)) | |
101 | BUG(); | |
102 | #endif | |
103 | } | |
104 | ||
009ec2a9 | 105 | static void __init fixrange_init(unsigned long start, unsigned long end, |
1da177e4 LT |
106 | pgd_t *pgd_base) |
107 | { | |
108 | pgd_t *pgd; | |
12f49643 | 109 | pud_t *pud; |
1da177e4 | 110 | pmd_t *pmd; |
1da177e4 LT |
111 | int i, j; |
112 | unsigned long vaddr; | |
113 | ||
114 | vaddr = start; | |
115 | i = pgd_index(vaddr); | |
116 | j = pmd_index(vaddr); | |
117 | pgd = pgd_base + i; | |
118 | ||
119 | for ( ; (i < PTRS_PER_PGD) && (vaddr < end); pgd++, i++) { | |
12f49643 JD |
120 | pud = pud_offset(pgd, vaddr); |
121 | if (pud_none(*pud)) | |
122 | one_md_table_init(pud); | |
123 | pmd = pmd_offset(pud, vaddr); | |
655e4ed0 | 124 | for (; (j < PTRS_PER_PMD) && (vaddr < end); pmd++, j++) { |
12f49643 | 125 | one_page_table_init(pmd); |
1da177e4 LT |
126 | vaddr += PMD_SIZE; |
127 | } | |
128 | j = 0; | |
129 | } | |
130 | } | |
131 | ||
132 | #ifdef CONFIG_HIGHMEM | |
133 | pte_t *kmap_pte; | |
134 | pgprot_t kmap_prot; | |
135 | ||
136 | #define kmap_get_fixmap_pte(vaddr) \ | |
137 | pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), (vaddr)),\ | |
8192ab42 | 138 | (vaddr)), (vaddr)) |
1da177e4 LT |
139 | |
140 | static void __init kmap_init(void) | |
141 | { | |
142 | unsigned long kmap_vstart; | |
143 | ||
144 | /* cache the first kmap pte */ | |
145 | kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN); | |
146 | kmap_pte = kmap_get_fixmap_pte(kmap_vstart); | |
147 | ||
148 | kmap_prot = PAGE_KERNEL; | |
149 | } | |
150 | ||
b4a08a10 | 151 | static void __init init_highmem(void) |
1da177e4 LT |
152 | { |
153 | pgd_t *pgd; | |
154 | pud_t *pud; | |
155 | pmd_t *pmd; | |
156 | pte_t *pte; | |
157 | unsigned long vaddr; | |
158 | ||
159 | /* | |
160 | * Permanent kmaps: | |
161 | */ | |
162 | vaddr = PKMAP_BASE; | |
163 | fixrange_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, swapper_pg_dir); | |
164 | ||
165 | pgd = swapper_pg_dir + pgd_index(vaddr); | |
166 | pud = pud_offset(pgd, vaddr); | |
167 | pmd = pmd_offset(pud, vaddr); | |
168 | pte = pte_offset_kernel(pmd, vaddr); | |
169 | pkmap_page_table = pte; | |
170 | ||
171 | kmap_init(); | |
172 | } | |
173 | #endif /* CONFIG_HIGHMEM */ | |
174 | ||
175 | static void __init fixaddr_user_init( void) | |
176 | { | |
9a0b3869 | 177 | #ifdef CONFIG_ARCH_REUSE_HOST_VSYSCALL_AREA |
1da177e4 LT |
178 | long size = FIXADDR_USER_END - FIXADDR_USER_START; |
179 | pgd_t *pgd; | |
180 | pud_t *pud; | |
181 | pmd_t *pmd; | |
182 | pte_t *pte; | |
655e4ed0 JD |
183 | phys_t p; |
184 | unsigned long v, vaddr = FIXADDR_USER_START; | |
1da177e4 | 185 | |
655e4ed0 | 186 | if (!size) |
1da177e4 LT |
187 | return; |
188 | ||
189 | fixrange_init( FIXADDR_USER_START, FIXADDR_USER_END, swapper_pg_dir); | |
655e4ed0 JD |
190 | v = (unsigned long) alloc_bootmem_low_pages(size); |
191 | memcpy((void *) v , (void *) FIXADDR_USER_START, size); | |
192 | p = __pa(v); | |
009ec2a9 | 193 | for ( ; size > 0; size -= PAGE_SIZE, vaddr += PAGE_SIZE, |
655e4ed0 | 194 | p += PAGE_SIZE) { |
1da177e4 LT |
195 | pgd = swapper_pg_dir + pgd_index(vaddr); |
196 | pud = pud_offset(pgd, vaddr); | |
197 | pmd = pmd_offset(pud, vaddr); | |
198 | pte = pte_offset_kernel(pmd, vaddr); | |
655e4ed0 | 199 | pte_set_val(*pte, p, PAGE_READONLY); |
1da177e4 LT |
200 | } |
201 | #endif | |
202 | } | |
203 | ||
36e45463 | 204 | void __init paging_init(void) |
1da177e4 LT |
205 | { |
206 | unsigned long zones_size[MAX_NR_ZONES], vaddr; | |
207 | int i; | |
208 | ||
209 | empty_zero_page = (unsigned long *) alloc_bootmem_low_pages(PAGE_SIZE); | |
210 | empty_bad_page = (unsigned long *) alloc_bootmem_low_pages(PAGE_SIZE); | |
009ec2a9 | 211 | for (i = 0; i < ARRAY_SIZE(zones_size); i++) |
1da177e4 | 212 | zones_size[i] = 0; |
91b165c0 | 213 | |
0715501b JD |
214 | zones_size[ZONE_NORMAL] = (end_iomem >> PAGE_SHIFT) - |
215 | (uml_physmem >> PAGE_SHIFT); | |
e53ef38d | 216 | #ifdef CONFIG_HIGHMEM |
353f8d1c | 217 | zones_size[ZONE_HIGHMEM] = highmem >> PAGE_SHIFT; |
e53ef38d | 218 | #endif |
1da177e4 LT |
219 | free_area_init(zones_size); |
220 | ||
221 | /* | |
222 | * Fixed mappings, only the page table structure has to be | |
223 | * created - mappings will be set by set_fixmap(): | |
224 | */ | |
225 | vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK; | |
226 | fixrange_init(vaddr, FIXADDR_TOP, swapper_pg_dir); | |
227 | ||
228 | fixaddr_user_init(); | |
229 | ||
230 | #ifdef CONFIG_HIGHMEM | |
231 | init_highmem(); | |
232 | #endif | |
233 | } | |
234 | ||
8192ab42 JD |
235 | /* |
236 | * This can't do anything because nothing in the kernel image can be freed | |
1da177e4 LT |
237 | * since it's not in kernel physical memory. |
238 | */ | |
239 | ||
240 | void free_initmem(void) | |
241 | { | |
242 | } | |
243 | ||
244 | #ifdef CONFIG_BLK_DEV_INITRD | |
1da177e4 LT |
245 | void free_initrd_mem(unsigned long start, unsigned long end) |
246 | { | |
e16e0b1b | 247 | free_reserved_area(start, end, 0, "initrd"); |
1da177e4 | 248 | } |
1da177e4 LT |
249 | #endif |
250 | ||
8192ab42 | 251 | /* Allocate and free page tables. */ |
1da177e4 LT |
252 | |
253 | pgd_t *pgd_alloc(struct mm_struct *mm) | |
254 | { | |
255 | pgd_t *pgd = (pgd_t *)__get_free_page(GFP_KERNEL); | |
256 | ||
257 | if (pgd) { | |
258 | memset(pgd, 0, USER_PTRS_PER_PGD * sizeof(pgd_t)); | |
009ec2a9 JD |
259 | memcpy(pgd + USER_PTRS_PER_PGD, |
260 | swapper_pg_dir + USER_PTRS_PER_PGD, | |
1da177e4 LT |
261 | (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t)); |
262 | } | |
263 | return pgd; | |
264 | } | |
265 | ||
5e541973 | 266 | void pgd_free(struct mm_struct *mm, pgd_t *pgd) |
1da177e4 LT |
267 | { |
268 | free_page((unsigned long) pgd); | |
269 | } | |
270 | ||
271 | pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address) | |
272 | { | |
273 | pte_t *pte; | |
274 | ||
275 | pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO); | |
276 | return pte; | |
277 | } | |
278 | ||
2f569afd | 279 | pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address) |
1da177e4 LT |
280 | { |
281 | struct page *pte; | |
60678bbc | 282 | |
1da177e4 | 283 | pte = alloc_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO); |
2f569afd MS |
284 | if (pte) |
285 | pgtable_page_ctor(pte); | |
1da177e4 LT |
286 | return pte; |
287 | } | |
8192ab42 JD |
288 | |
289 | #ifdef CONFIG_3_LEVEL_PGTABLES | |
290 | pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address) | |
291 | { | |
292 | pmd_t *pmd = (pmd_t *) __get_free_page(GFP_KERNEL); | |
293 | ||
294 | if (pmd) | |
295 | memset(pmd, 0, PAGE_SIZE); | |
296 | ||
297 | return pmd; | |
298 | } | |
299 | #endif | |
43f5b308 JD |
300 | |
301 | void *uml_kmalloc(int size, int flags) | |
302 | { | |
303 | return kmalloc(size, flags); | |
304 | } |