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> | |
4ff83ce1 | 15 | #include "as-layout.h" |
009ec2a9 | 16 | #include "init.h" |
1da177e4 | 17 | #include "kern.h" |
009ec2a9 | 18 | #include "kern_util.h" |
1da177e4 | 19 | #include "mem_user.h" |
1da177e4 LT |
20 | #include "os.h" |
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 | { | |
45 | struct page *page; | |
46 | unsigned long highmem_pfn; | |
47 | int i; | |
48 | ||
49 | highmem_pfn = __pa(highmem_start) >> PAGE_SHIFT; | |
009ec2a9 | 50 | for (i = 0; i < highmem_len >> PAGE_SHIFT; i++) { |
1da177e4 LT |
51 | page = &mem_map[highmem_pfn + i]; |
52 | ClearPageReserved(page); | |
7835e98b | 53 | init_page_count(page); |
1da177e4 LT |
54 | __free_page(page); |
55 | } | |
56 | } | |
57 | #endif | |
58 | ||
97a1fcbb | 59 | void __init mem_init(void) |
1da177e4 | 60 | { |
60678bbc | 61 | /* clear the zero-page */ |
c0a9290e | 62 | memset(empty_zero_page, 0, PAGE_SIZE); |
1da177e4 LT |
63 | |
64 | /* Map in the area just after the brk now that kmalloc is about | |
65 | * to be turned on. | |
66 | */ | |
67 | brk_end = (unsigned long) UML_ROUND_UP(sbrk(0)); | |
ab26a527 | 68 | map_memory(brk_end, __pa(brk_end), uml_reserved - brk_end, 1, 1, 0); |
1da177e4 LT |
69 | free_bootmem(__pa(brk_end), uml_reserved - brk_end); |
70 | uml_reserved = brk_end; | |
71 | ||
1da177e4 LT |
72 | /* this will put all low memory onto the freelists */ |
73 | totalram_pages = free_all_bootmem(); | |
af84eab2 | 74 | max_low_pfn = totalram_pages; |
c1f60a5a | 75 | #ifdef CONFIG_HIGHMEM |
1da177e4 LT |
76 | totalhigh_pages = highmem >> PAGE_SHIFT; |
77 | totalram_pages += totalhigh_pages; | |
c1f60a5a | 78 | #endif |
1da177e4 LT |
79 | num_physpages = totalram_pages; |
80 | max_pfn = totalram_pages; | |
009ec2a9 | 81 | printk(KERN_INFO "Memory: %luk available\n", |
cc013a88 | 82 | nr_free_pages() << (PAGE_SHIFT-10)); |
1da177e4 LT |
83 | kmalloc_ok = 1; |
84 | ||
85 | #ifdef CONFIG_HIGHMEM | |
86 | setup_highmem(end_iomem, highmem); | |
87 | #endif | |
88 | } | |
89 | ||
12f49643 JD |
90 | /* |
91 | * Create a page table and place a pointer to it in a middle page | |
92 | * directory entry. | |
93 | */ | |
94 | static void __init one_page_table_init(pmd_t *pmd) | |
95 | { | |
96 | if (pmd_none(*pmd)) { | |
97 | pte_t *pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE); | |
98 | set_pmd(pmd, __pmd(_KERNPG_TABLE + | |
99 | (unsigned long) __pa(pte))); | |
100 | if (pte != pte_offset_kernel(pmd, 0)) | |
101 | BUG(); | |
102 | } | |
103 | } | |
104 | ||
105 | static void __init one_md_table_init(pud_t *pud) | |
106 | { | |
107 | #ifdef CONFIG_3_LEVEL_PGTABLES | |
108 | pmd_t *pmd_table = (pmd_t *) alloc_bootmem_low_pages(PAGE_SIZE); | |
109 | set_pud(pud, __pud(_KERNPG_TABLE + (unsigned long) __pa(pmd_table))); | |
110 | if (pmd_table != pmd_offset(pud, 0)) | |
111 | BUG(); | |
112 | #endif | |
113 | } | |
114 | ||
009ec2a9 | 115 | static void __init fixrange_init(unsigned long start, unsigned long end, |
1da177e4 LT |
116 | pgd_t *pgd_base) |
117 | { | |
118 | pgd_t *pgd; | |
12f49643 | 119 | pud_t *pud; |
1da177e4 | 120 | pmd_t *pmd; |
1da177e4 LT |
121 | int i, j; |
122 | unsigned long vaddr; | |
123 | ||
124 | vaddr = start; | |
125 | i = pgd_index(vaddr); | |
126 | j = pmd_index(vaddr); | |
127 | pgd = pgd_base + i; | |
128 | ||
129 | for ( ; (i < PTRS_PER_PGD) && (vaddr < end); pgd++, i++) { | |
12f49643 JD |
130 | pud = pud_offset(pgd, vaddr); |
131 | if (pud_none(*pud)) | |
132 | one_md_table_init(pud); | |
133 | pmd = pmd_offset(pud, vaddr); | |
655e4ed0 | 134 | for (; (j < PTRS_PER_PMD) && (vaddr < end); pmd++, j++) { |
12f49643 | 135 | one_page_table_init(pmd); |
1da177e4 LT |
136 | vaddr += PMD_SIZE; |
137 | } | |
138 | j = 0; | |
139 | } | |
140 | } | |
141 | ||
142 | #ifdef CONFIG_HIGHMEM | |
143 | pte_t *kmap_pte; | |
144 | pgprot_t kmap_prot; | |
145 | ||
146 | #define kmap_get_fixmap_pte(vaddr) \ | |
147 | pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), (vaddr)),\ | |
8192ab42 | 148 | (vaddr)), (vaddr)) |
1da177e4 LT |
149 | |
150 | static void __init kmap_init(void) | |
151 | { | |
152 | unsigned long kmap_vstart; | |
153 | ||
154 | /* cache the first kmap pte */ | |
155 | kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN); | |
156 | kmap_pte = kmap_get_fixmap_pte(kmap_vstart); | |
157 | ||
158 | kmap_prot = PAGE_KERNEL; | |
159 | } | |
160 | ||
b4a08a10 | 161 | static void __init init_highmem(void) |
1da177e4 LT |
162 | { |
163 | pgd_t *pgd; | |
164 | pud_t *pud; | |
165 | pmd_t *pmd; | |
166 | pte_t *pte; | |
167 | unsigned long vaddr; | |
168 | ||
169 | /* | |
170 | * Permanent kmaps: | |
171 | */ | |
172 | vaddr = PKMAP_BASE; | |
173 | fixrange_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, swapper_pg_dir); | |
174 | ||
175 | pgd = swapper_pg_dir + pgd_index(vaddr); | |
176 | pud = pud_offset(pgd, vaddr); | |
177 | pmd = pmd_offset(pud, vaddr); | |
178 | pte = pte_offset_kernel(pmd, vaddr); | |
179 | pkmap_page_table = pte; | |
180 | ||
181 | kmap_init(); | |
182 | } | |
183 | #endif /* CONFIG_HIGHMEM */ | |
184 | ||
185 | static void __init fixaddr_user_init( void) | |
186 | { | |
9a0b3869 | 187 | #ifdef CONFIG_ARCH_REUSE_HOST_VSYSCALL_AREA |
1da177e4 LT |
188 | long size = FIXADDR_USER_END - FIXADDR_USER_START; |
189 | pgd_t *pgd; | |
190 | pud_t *pud; | |
191 | pmd_t *pmd; | |
192 | pte_t *pte; | |
655e4ed0 JD |
193 | phys_t p; |
194 | unsigned long v, vaddr = FIXADDR_USER_START; | |
1da177e4 | 195 | |
655e4ed0 | 196 | if (!size) |
1da177e4 LT |
197 | return; |
198 | ||
199 | fixrange_init( FIXADDR_USER_START, FIXADDR_USER_END, swapper_pg_dir); | |
655e4ed0 JD |
200 | v = (unsigned long) alloc_bootmem_low_pages(size); |
201 | memcpy((void *) v , (void *) FIXADDR_USER_START, size); | |
202 | p = __pa(v); | |
009ec2a9 | 203 | for ( ; size > 0; size -= PAGE_SIZE, vaddr += PAGE_SIZE, |
655e4ed0 | 204 | p += PAGE_SIZE) { |
1da177e4 LT |
205 | pgd = swapper_pg_dir + pgd_index(vaddr); |
206 | pud = pud_offset(pgd, vaddr); | |
207 | pmd = pmd_offset(pud, vaddr); | |
208 | pte = pte_offset_kernel(pmd, vaddr); | |
655e4ed0 | 209 | pte_set_val(*pte, p, PAGE_READONLY); |
1da177e4 LT |
210 | } |
211 | #endif | |
212 | } | |
213 | ||
36e45463 | 214 | void __init paging_init(void) |
1da177e4 LT |
215 | { |
216 | unsigned long zones_size[MAX_NR_ZONES], vaddr; | |
217 | int i; | |
218 | ||
219 | empty_zero_page = (unsigned long *) alloc_bootmem_low_pages(PAGE_SIZE); | |
220 | empty_bad_page = (unsigned long *) alloc_bootmem_low_pages(PAGE_SIZE); | |
009ec2a9 | 221 | for (i = 0; i < ARRAY_SIZE(zones_size); i++) |
1da177e4 | 222 | zones_size[i] = 0; |
91b165c0 | 223 | |
0715501b JD |
224 | zones_size[ZONE_NORMAL] = (end_iomem >> PAGE_SHIFT) - |
225 | (uml_physmem >> PAGE_SHIFT); | |
e53ef38d | 226 | #ifdef CONFIG_HIGHMEM |
353f8d1c | 227 | zones_size[ZONE_HIGHMEM] = highmem >> PAGE_SHIFT; |
e53ef38d | 228 | #endif |
1da177e4 LT |
229 | free_area_init(zones_size); |
230 | ||
231 | /* | |
232 | * Fixed mappings, only the page table structure has to be | |
233 | * created - mappings will be set by set_fixmap(): | |
234 | */ | |
235 | vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK; | |
236 | fixrange_init(vaddr, FIXADDR_TOP, swapper_pg_dir); | |
237 | ||
238 | fixaddr_user_init(); | |
239 | ||
240 | #ifdef CONFIG_HIGHMEM | |
241 | init_highmem(); | |
242 | #endif | |
243 | } | |
244 | ||
8192ab42 JD |
245 | /* |
246 | * This can't do anything because nothing in the kernel image can be freed | |
1da177e4 LT |
247 | * since it's not in kernel physical memory. |
248 | */ | |
249 | ||
250 | void free_initmem(void) | |
251 | { | |
252 | } | |
253 | ||
254 | #ifdef CONFIG_BLK_DEV_INITRD | |
1da177e4 LT |
255 | void free_initrd_mem(unsigned long start, unsigned long end) |
256 | { | |
257 | if (start < end) | |
009ec2a9 JD |
258 | printk(KERN_INFO "Freeing initrd memory: %ldk freed\n", |
259 | (end - start) >> 10); | |
1da177e4 LT |
260 | for (; start < end; start += PAGE_SIZE) { |
261 | ClearPageReserved(virt_to_page(start)); | |
7835e98b | 262 | init_page_count(virt_to_page(start)); |
1da177e4 LT |
263 | free_page(start); |
264 | totalram_pages++; | |
265 | } | |
266 | } | |
1da177e4 LT |
267 | #endif |
268 | ||
8192ab42 | 269 | /* Allocate and free page tables. */ |
1da177e4 LT |
270 | |
271 | pgd_t *pgd_alloc(struct mm_struct *mm) | |
272 | { | |
273 | pgd_t *pgd = (pgd_t *)__get_free_page(GFP_KERNEL); | |
274 | ||
275 | if (pgd) { | |
276 | memset(pgd, 0, USER_PTRS_PER_PGD * sizeof(pgd_t)); | |
009ec2a9 JD |
277 | memcpy(pgd + USER_PTRS_PER_PGD, |
278 | swapper_pg_dir + USER_PTRS_PER_PGD, | |
1da177e4 LT |
279 | (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t)); |
280 | } | |
281 | return pgd; | |
282 | } | |
283 | ||
5e541973 | 284 | void pgd_free(struct mm_struct *mm, pgd_t *pgd) |
1da177e4 LT |
285 | { |
286 | free_page((unsigned long) pgd); | |
287 | } | |
288 | ||
289 | pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address) | |
290 | { | |
291 | pte_t *pte; | |
292 | ||
293 | pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO); | |
294 | return pte; | |
295 | } | |
296 | ||
2f569afd | 297 | pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address) |
1da177e4 LT |
298 | { |
299 | struct page *pte; | |
60678bbc | 300 | |
1da177e4 | 301 | pte = alloc_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO); |
2f569afd MS |
302 | if (pte) |
303 | pgtable_page_ctor(pte); | |
1da177e4 LT |
304 | return pte; |
305 | } | |
8192ab42 JD |
306 | |
307 | #ifdef CONFIG_3_LEVEL_PGTABLES | |
308 | pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address) | |
309 | { | |
310 | pmd_t *pmd = (pmd_t *) __get_free_page(GFP_KERNEL); | |
311 | ||
312 | if (pmd) | |
313 | memset(pmd, 0, PAGE_SIZE); | |
314 | ||
315 | return pmd; | |
316 | } | |
317 | #endif | |
43f5b308 JD |
318 | |
319 | void *uml_kmalloc(int size, int flags) | |
320 | { | |
321 | return kmalloc(size, flags); | |
322 | } |