Commit | Line | Data |
---|---|---|
114069f7 | 1 | /* |
1da177e4 LT |
2 | * Copyright (C) 2000 - 2003 Jeff Dike (jdike@addtoit.com) |
3 | * Licensed under the GPL | |
4 | */ | |
5 | ||
6 | #include "linux/stddef.h" | |
7 | #include "linux/kernel.h" | |
8 | #include "linux/mm.h" | |
9 | #include "linux/bootmem.h" | |
10 | #include "linux/swap.h" | |
11 | #include "linux/highmem.h" | |
12 | #include "linux/gfp.h" | |
13 | #include "asm/page.h" | |
14 | #include "asm/fixmap.h" | |
15 | #include "asm/pgalloc.h" | |
1da177e4 | 16 | #include "kern_util.h" |
4ff83ce1 | 17 | #include "as-layout.h" |
1da177e4 LT |
18 | #include "kern.h" |
19 | #include "mem_user.h" | |
fab95c55 | 20 | #include "um_uaccess.h" |
1da177e4 | 21 | #include "os.h" |
114069f7 JD |
22 | #include "linux/types.h" |
23 | #include "linux/string.h" | |
24 | #include "init.h" | |
25 | #include "kern_constants.h" | |
1da177e4 | 26 | |
6bf79482 | 27 | /* allocated in paging_init, zeroed in mem_init, and unchanged thereafter */ |
1da177e4 | 28 | unsigned long *empty_zero_page = NULL; |
6bf79482 | 29 | /* allocated in paging_init and unchanged thereafter */ |
1da177e4 LT |
30 | unsigned long *empty_bad_page = NULL; |
31 | pgd_t swapper_pg_dir[PTRS_PER_PGD]; | |
9902abd7 | 32 | unsigned long long highmem; |
1da177e4 LT |
33 | int kmalloc_ok = 0; |
34 | ||
35 | static unsigned long brk_end; | |
36 | ||
37 | void unmap_physmem(void) | |
38 | { | |
39 | os_unmap_memory((void *) brk_end, uml_reserved - brk_end); | |
40 | } | |
41 | ||
42 | static void map_cb(void *unused) | |
43 | { | |
44 | map_memory(brk_end, __pa(brk_end), uml_reserved - brk_end, 1, 1, 0); | |
45 | } | |
46 | ||
47 | #ifdef CONFIG_HIGHMEM | |
48 | static void setup_highmem(unsigned long highmem_start, | |
49 | unsigned long highmem_len) | |
50 | { | |
51 | struct page *page; | |
52 | unsigned long highmem_pfn; | |
53 | int i; | |
54 | ||
55 | highmem_pfn = __pa(highmem_start) >> PAGE_SHIFT; | |
56 | for(i = 0; i < highmem_len >> PAGE_SHIFT; i++){ | |
57 | page = &mem_map[highmem_pfn + i]; | |
58 | ClearPageReserved(page); | |
7835e98b | 59 | init_page_count(page); |
1da177e4 LT |
60 | __free_page(page); |
61 | } | |
62 | } | |
63 | #endif | |
64 | ||
97a1fcbb | 65 | void __init mem_init(void) |
1da177e4 | 66 | { |
60678bbc | 67 | /* clear the zero-page */ |
c0a9290e | 68 | memset(empty_zero_page, 0, PAGE_SIZE); |
1da177e4 LT |
69 | |
70 | /* Map in the area just after the brk now that kmalloc is about | |
71 | * to be turned on. | |
72 | */ | |
73 | brk_end = (unsigned long) UML_ROUND_UP(sbrk(0)); | |
74 | map_cb(NULL); | |
75 | initial_thread_cb(map_cb, NULL); | |
76 | free_bootmem(__pa(brk_end), uml_reserved - brk_end); | |
77 | uml_reserved = brk_end; | |
78 | ||
1da177e4 LT |
79 | /* this will put all low memory onto the freelists */ |
80 | totalram_pages = free_all_bootmem(); | |
af84eab2 | 81 | max_low_pfn = totalram_pages; |
c1f60a5a | 82 | #ifdef CONFIG_HIGHMEM |
1da177e4 LT |
83 | totalhigh_pages = highmem >> PAGE_SHIFT; |
84 | totalram_pages += totalhigh_pages; | |
c1f60a5a | 85 | #endif |
1da177e4 LT |
86 | num_physpages = totalram_pages; |
87 | max_pfn = totalram_pages; | |
88 | printk(KERN_INFO "Memory: %luk available\n", | |
89 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10)); | |
90 | kmalloc_ok = 1; | |
91 | ||
92 | #ifdef CONFIG_HIGHMEM | |
93 | setup_highmem(end_iomem, highmem); | |
94 | #endif | |
95 | } | |
96 | ||
12f49643 JD |
97 | /* |
98 | * Create a page table and place a pointer to it in a middle page | |
99 | * directory entry. | |
100 | */ | |
101 | static void __init one_page_table_init(pmd_t *pmd) | |
102 | { | |
103 | if (pmd_none(*pmd)) { | |
104 | pte_t *pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE); | |
105 | set_pmd(pmd, __pmd(_KERNPG_TABLE + | |
106 | (unsigned long) __pa(pte))); | |
107 | if (pte != pte_offset_kernel(pmd, 0)) | |
108 | BUG(); | |
109 | } | |
110 | } | |
111 | ||
112 | static void __init one_md_table_init(pud_t *pud) | |
113 | { | |
114 | #ifdef CONFIG_3_LEVEL_PGTABLES | |
115 | pmd_t *pmd_table = (pmd_t *) alloc_bootmem_low_pages(PAGE_SIZE); | |
116 | set_pud(pud, __pud(_KERNPG_TABLE + (unsigned long) __pa(pmd_table))); | |
117 | if (pmd_table != pmd_offset(pud, 0)) | |
118 | BUG(); | |
119 | #endif | |
120 | } | |
121 | ||
1da177e4 LT |
122 | static void __init fixrange_init(unsigned long start, unsigned long end, |
123 | pgd_t *pgd_base) | |
124 | { | |
125 | pgd_t *pgd; | |
12f49643 | 126 | pud_t *pud; |
1da177e4 | 127 | pmd_t *pmd; |
1da177e4 LT |
128 | int i, j; |
129 | unsigned long vaddr; | |
130 | ||
131 | vaddr = start; | |
132 | i = pgd_index(vaddr); | |
133 | j = pmd_index(vaddr); | |
134 | pgd = pgd_base + i; | |
135 | ||
136 | for ( ; (i < PTRS_PER_PGD) && (vaddr < end); pgd++, i++) { | |
12f49643 JD |
137 | pud = pud_offset(pgd, vaddr); |
138 | if (pud_none(*pud)) | |
139 | one_md_table_init(pud); | |
140 | pmd = pmd_offset(pud, vaddr); | |
1da177e4 | 141 | for (; (j < PTRS_PER_PMD) && (vaddr != end); pmd++, j++) { |
12f49643 | 142 | one_page_table_init(pmd); |
1da177e4 LT |
143 | vaddr += PMD_SIZE; |
144 | } | |
145 | j = 0; | |
146 | } | |
147 | } | |
148 | ||
149 | #ifdef CONFIG_HIGHMEM | |
150 | pte_t *kmap_pte; | |
151 | pgprot_t kmap_prot; | |
152 | ||
153 | #define kmap_get_fixmap_pte(vaddr) \ | |
154 | pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), (vaddr)),\ | |
8192ab42 | 155 | (vaddr)), (vaddr)) |
1da177e4 LT |
156 | |
157 | static void __init kmap_init(void) | |
158 | { | |
159 | unsigned long kmap_vstart; | |
160 | ||
161 | /* cache the first kmap pte */ | |
162 | kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN); | |
163 | kmap_pte = kmap_get_fixmap_pte(kmap_vstart); | |
164 | ||
165 | kmap_prot = PAGE_KERNEL; | |
166 | } | |
167 | ||
b4a08a10 | 168 | static void __init init_highmem(void) |
1da177e4 LT |
169 | { |
170 | pgd_t *pgd; | |
171 | pud_t *pud; | |
172 | pmd_t *pmd; | |
173 | pte_t *pte; | |
174 | unsigned long vaddr; | |
175 | ||
176 | /* | |
177 | * Permanent kmaps: | |
178 | */ | |
179 | vaddr = PKMAP_BASE; | |
180 | fixrange_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, swapper_pg_dir); | |
181 | ||
182 | pgd = swapper_pg_dir + pgd_index(vaddr); | |
183 | pud = pud_offset(pgd, vaddr); | |
184 | pmd = pmd_offset(pud, vaddr); | |
185 | pte = pte_offset_kernel(pmd, vaddr); | |
186 | pkmap_page_table = pte; | |
187 | ||
188 | kmap_init(); | |
189 | } | |
190 | #endif /* CONFIG_HIGHMEM */ | |
191 | ||
192 | static void __init fixaddr_user_init( void) | |
193 | { | |
9a0b3869 | 194 | #ifdef CONFIG_ARCH_REUSE_HOST_VSYSCALL_AREA |
1da177e4 LT |
195 | long size = FIXADDR_USER_END - FIXADDR_USER_START; |
196 | pgd_t *pgd; | |
197 | pud_t *pud; | |
198 | pmd_t *pmd; | |
199 | pte_t *pte; | |
200 | unsigned long paddr, vaddr = FIXADDR_USER_START; | |
201 | ||
202 | if ( ! size ) | |
203 | return; | |
204 | ||
205 | fixrange_init( FIXADDR_USER_START, FIXADDR_USER_END, swapper_pg_dir); | |
206 | paddr = (unsigned long)alloc_bootmem_low_pages( size); | |
207 | memcpy( (void *)paddr, (void *)FIXADDR_USER_START, size); | |
208 | paddr = __pa(paddr); | |
209 | for ( ; size > 0; size-=PAGE_SIZE, vaddr+=PAGE_SIZE, paddr+=PAGE_SIZE){ | |
210 | pgd = swapper_pg_dir + pgd_index(vaddr); | |
211 | pud = pud_offset(pgd, vaddr); | |
212 | pmd = pmd_offset(pud, vaddr); | |
213 | pte = pte_offset_kernel(pmd, vaddr); | |
214 | pte_set_val( (*pte), paddr, PAGE_READONLY); | |
215 | } | |
216 | #endif | |
217 | } | |
218 | ||
36e45463 | 219 | void __init paging_init(void) |
1da177e4 LT |
220 | { |
221 | unsigned long zones_size[MAX_NR_ZONES], vaddr; | |
222 | int i; | |
223 | ||
224 | empty_zero_page = (unsigned long *) alloc_bootmem_low_pages(PAGE_SIZE); | |
225 | empty_bad_page = (unsigned long *) alloc_bootmem_low_pages(PAGE_SIZE); | |
91b165c0 | 226 | for(i = 0; i < ARRAY_SIZE(zones_size); i++) |
1da177e4 | 227 | zones_size[i] = 0; |
91b165c0 | 228 | |
0715501b JD |
229 | zones_size[ZONE_NORMAL] = (end_iomem >> PAGE_SHIFT) - |
230 | (uml_physmem >> PAGE_SHIFT); | |
e53ef38d | 231 | #ifdef CONFIG_HIGHMEM |
353f8d1c | 232 | zones_size[ZONE_HIGHMEM] = highmem >> PAGE_SHIFT; |
e53ef38d | 233 | #endif |
1da177e4 LT |
234 | free_area_init(zones_size); |
235 | ||
236 | /* | |
237 | * Fixed mappings, only the page table structure has to be | |
238 | * created - mappings will be set by set_fixmap(): | |
239 | */ | |
240 | vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK; | |
241 | fixrange_init(vaddr, FIXADDR_TOP, swapper_pg_dir); | |
242 | ||
243 | fixaddr_user_init(); | |
244 | ||
245 | #ifdef CONFIG_HIGHMEM | |
246 | init_highmem(); | |
247 | #endif | |
248 | } | |
249 | ||
53f9fc93 | 250 | struct page *arch_validate(struct page *page, gfp_t mask, int order) |
1da177e4 LT |
251 | { |
252 | unsigned long addr, zero = 0; | |
253 | int i; | |
254 | ||
255 | again: | |
60678bbc JD |
256 | if(page == NULL) |
257 | return page; | |
258 | if(PageHighMem(page)) | |
259 | return page; | |
1da177e4 LT |
260 | |
261 | addr = (unsigned long) page_address(page); | |
262 | for(i = 0; i < (1 << order); i++){ | |
263 | current->thread.fault_addr = (void *) addr; | |
264 | if(__do_copy_to_user((void __user *) addr, &zero, | |
265 | sizeof(zero), | |
266 | ¤t->thread.fault_addr, | |
267 | ¤t->thread.fault_catcher)){ | |
60678bbc JD |
268 | if(!(mask & __GFP_WAIT)) |
269 | return NULL; | |
1da177e4 LT |
270 | else break; |
271 | } | |
272 | addr += PAGE_SIZE; | |
273 | } | |
274 | ||
60678bbc JD |
275 | if(i == (1 << order)) |
276 | return page; | |
1da177e4 LT |
277 | page = alloc_pages(mask, order); |
278 | goto again; | |
279 | } | |
280 | ||
8192ab42 JD |
281 | /* |
282 | * This can't do anything because nothing in the kernel image can be freed | |
1da177e4 LT |
283 | * since it's not in kernel physical memory. |
284 | */ | |
285 | ||
286 | void free_initmem(void) | |
287 | { | |
288 | } | |
289 | ||
290 | #ifdef CONFIG_BLK_DEV_INITRD | |
1da177e4 LT |
291 | void free_initrd_mem(unsigned long start, unsigned long end) |
292 | { | |
293 | if (start < end) | |
294 | printk ("Freeing initrd memory: %ldk freed\n", | |
295 | (end - start) >> 10); | |
296 | for (; start < end; start += PAGE_SIZE) { | |
297 | ClearPageReserved(virt_to_page(start)); | |
7835e98b | 298 | init_page_count(virt_to_page(start)); |
1da177e4 LT |
299 | free_page(start); |
300 | totalram_pages++; | |
301 | } | |
302 | } | |
1da177e4 LT |
303 | #endif |
304 | ||
305 | void show_mem(void) | |
306 | { | |
60678bbc JD |
307 | int pfn, total = 0, reserved = 0; |
308 | int shared = 0, cached = 0; | |
309 | int highmem = 0; | |
1da177e4 LT |
310 | struct page *page; |
311 | ||
60678bbc JD |
312 | printk("Mem-info:\n"); |
313 | show_free_areas(); | |
314 | printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); | |
315 | pfn = max_mapnr; | |
316 | while(pfn-- > 0) { | |
1da177e4 | 317 | page = pfn_to_page(pfn); |
60678bbc JD |
318 | total++; |
319 | if(PageHighMem(page)) | |
320 | highmem++; | |
321 | if(PageReserved(page)) | |
322 | reserved++; | |
323 | else if(PageSwapCache(page)) | |
324 | cached++; | |
325 | else if(page_count(page)) | |
326 | shared += page_count(page) - 1; | |
327 | } | |
328 | printk("%d pages of RAM\n", total); | |
329 | printk("%d pages of HIGHMEM\n", highmem); | |
330 | printk("%d reserved pages\n", reserved); | |
331 | printk("%d pages shared\n", shared); | |
332 | printk("%d pages swap cached\n", cached); | |
1da177e4 LT |
333 | } |
334 | ||
8192ab42 | 335 | /* Allocate and free page tables. */ |
1da177e4 LT |
336 | |
337 | pgd_t *pgd_alloc(struct mm_struct *mm) | |
338 | { | |
339 | pgd_t *pgd = (pgd_t *)__get_free_page(GFP_KERNEL); | |
340 | ||
341 | if (pgd) { | |
342 | memset(pgd, 0, USER_PTRS_PER_PGD * sizeof(pgd_t)); | |
343 | memcpy(pgd + USER_PTRS_PER_PGD, | |
344 | swapper_pg_dir + USER_PTRS_PER_PGD, | |
345 | (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t)); | |
346 | } | |
347 | return pgd; | |
348 | } | |
349 | ||
5e541973 | 350 | void pgd_free(struct mm_struct *mm, pgd_t *pgd) |
1da177e4 LT |
351 | { |
352 | free_page((unsigned long) pgd); | |
353 | } | |
354 | ||
355 | pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address) | |
356 | { | |
357 | pte_t *pte; | |
358 | ||
359 | pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO); | |
360 | return pte; | |
361 | } | |
362 | ||
363 | struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address) | |
364 | { | |
365 | struct page *pte; | |
60678bbc | 366 | |
1da177e4 LT |
367 | pte = alloc_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO); |
368 | return pte; | |
369 | } | |
8192ab42 JD |
370 | |
371 | #ifdef CONFIG_3_LEVEL_PGTABLES | |
372 | pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address) | |
373 | { | |
374 | pmd_t *pmd = (pmd_t *) __get_free_page(GFP_KERNEL); | |
375 | ||
376 | if (pmd) | |
377 | memset(pmd, 0, PAGE_SIZE); | |
378 | ||
379 | return pmd; | |
380 | } | |
381 | #endif |