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1/*
2 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3 * Licensed under the GPL
4 */
5
6#include <linux/stddef.h>
7#include <linux/module.h>
8#include <linux/bootmem.h>
9#include <linux/highmem.h>
10#include <linux/mm.h>
11#include <linux/swap.h>
12#include <linux/slab.h>
13#include <asm/fixmap.h>
14#include <asm/page.h>
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>
21
22/* allocated in paging_init, zeroed in mem_init, and unchanged thereafter */
23unsigned long *empty_zero_page = NULL;
24EXPORT_SYMBOL(empty_zero_page);
25
26/*
27 * Initialized during boot, and readonly for initializing page tables
28 * afterwards
29 */
30pgd_t swapper_pg_dir[PTRS_PER_PGD];
31
32/* Initialized at boot time, and readonly after that */
33unsigned long long highmem;
34int kmalloc_ok = 0;
35
36/* Used during early boot */
37static unsigned long brk_end;
38
39void __init mem_init(void)
40{
41 /* clear the zero-page */
42 memset(empty_zero_page, 0, PAGE_SIZE);
43
44 /* Map in the area just after the brk now that kmalloc is about
45 * to be turned on.
46 */
47 brk_end = (unsigned long) UML_ROUND_UP(sbrk(0));
48 map_memory(brk_end, __pa(brk_end), uml_reserved - brk_end, 1, 1, 0);
49 free_bootmem(__pa(brk_end), uml_reserved - brk_end);
50 uml_reserved = brk_end;
51
52 /* this will put all low memory onto the freelists */
53 free_all_bootmem();
54 max_low_pfn = totalram_pages;
55 max_pfn = totalram_pages;
56 mem_init_print_info(NULL);
57 kmalloc_ok = 1;
58}
59
60/*
61 * Create a page table and place a pointer to it in a middle page
62 * directory entry.
63 */
64static void __init one_page_table_init(pmd_t *pmd)
65{
66 if (pmd_none(*pmd)) {
67 pte_t *pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
68 set_pmd(pmd, __pmd(_KERNPG_TABLE +
69 (unsigned long) __pa(pte)));
70 if (pte != pte_offset_kernel(pmd, 0))
71 BUG();
72 }
73}
74
75static void __init one_md_table_init(pud_t *pud)
76{
77#ifdef CONFIG_3_LEVEL_PGTABLES
78 pmd_t *pmd_table = (pmd_t *) alloc_bootmem_low_pages(PAGE_SIZE);
79 set_pud(pud, __pud(_KERNPG_TABLE + (unsigned long) __pa(pmd_table)));
80 if (pmd_table != pmd_offset(pud, 0))
81 BUG();
82#endif
83}
84
85static void __init fixrange_init(unsigned long start, unsigned long end,
86 pgd_t *pgd_base)
87{
88 pgd_t *pgd;
89 pud_t *pud;
90 pmd_t *pmd;
91 int i, j;
92 unsigned long vaddr;
93
94 vaddr = start;
95 i = pgd_index(vaddr);
96 j = pmd_index(vaddr);
97 pgd = pgd_base + i;
98
99 for ( ; (i < PTRS_PER_PGD) && (vaddr < end); pgd++, i++) {
100 pud = pud_offset(pgd, vaddr);
101 if (pud_none(*pud))
102 one_md_table_init(pud);
103 pmd = pmd_offset(pud, vaddr);
104 for (; (j < PTRS_PER_PMD) && (vaddr < end); pmd++, j++) {
105 one_page_table_init(pmd);
106 vaddr += PMD_SIZE;
107 }
108 j = 0;
109 }
110}
111
112static void __init fixaddr_user_init( void)
113{
114#ifdef CONFIG_ARCH_REUSE_HOST_VSYSCALL_AREA
115 long size = FIXADDR_USER_END - FIXADDR_USER_START;
116 pgd_t *pgd;
117 pud_t *pud;
118 pmd_t *pmd;
119 pte_t *pte;
120 phys_t p;
121 unsigned long v, vaddr = FIXADDR_USER_START;
122
123 if (!size)
124 return;
125
126 fixrange_init( FIXADDR_USER_START, FIXADDR_USER_END, swapper_pg_dir);
127 v = (unsigned long) alloc_bootmem_low_pages(size);
128 memcpy((void *) v , (void *) FIXADDR_USER_START, size);
129 p = __pa(v);
130 for ( ; size > 0; size -= PAGE_SIZE, vaddr += PAGE_SIZE,
131 p += PAGE_SIZE) {
132 pgd = swapper_pg_dir + pgd_index(vaddr);
133 pud = pud_offset(pgd, vaddr);
134 pmd = pmd_offset(pud, vaddr);
135 pte = pte_offset_kernel(pmd, vaddr);
136 pte_set_val(*pte, p, PAGE_READONLY);
137 }
138#endif
139}
140
141void __init paging_init(void)
142{
143 unsigned long zones_size[MAX_NR_ZONES], vaddr;
144 int i;
145
146 empty_zero_page = (unsigned long *) alloc_bootmem_low_pages(PAGE_SIZE);
147 for (i = 0; i < ARRAY_SIZE(zones_size); i++)
148 zones_size[i] = 0;
149
150 zones_size[ZONE_NORMAL] = (end_iomem >> PAGE_SHIFT) -
151 (uml_physmem >> PAGE_SHIFT);
152 free_area_init(zones_size);
153
154 /*
155 * Fixed mappings, only the page table structure has to be
156 * created - mappings will be set by set_fixmap():
157 */
158 vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
159 fixrange_init(vaddr, FIXADDR_TOP, swapper_pg_dir);
160
161 fixaddr_user_init();
162}
163
164/*
165 * This can't do anything because nothing in the kernel image can be freed
166 * since it's not in kernel physical memory.
167 */
168
169void free_initmem(void)
170{
171}
172
173#ifdef CONFIG_BLK_DEV_INITRD
174void free_initrd_mem(unsigned long start, unsigned long end)
175{
176 free_reserved_area((void *)start, (void *)end, -1, "initrd");
177}
178#endif
179
180/* Allocate and free page tables. */
181
182pgd_t *pgd_alloc(struct mm_struct *mm)
183{
184 pgd_t *pgd = (pgd_t *)__get_free_page(GFP_KERNEL);
185
186 if (pgd) {
187 memset(pgd, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
188 memcpy(pgd + USER_PTRS_PER_PGD,
189 swapper_pg_dir + USER_PTRS_PER_PGD,
190 (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
191 }
192 return pgd;
193}
194
195void pgd_free(struct mm_struct *mm, pgd_t *pgd)
196{
197 free_page((unsigned long) pgd);
198}
199
200pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
201{
202 pte_t *pte;
203
204 pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_ZERO);
205 return pte;
206}
207
208pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address)
209{
210 struct page *pte;
211
212 pte = alloc_page(GFP_KERNEL|__GFP_ZERO);
213 if (!pte)
214 return NULL;
215 if (!pgtable_page_ctor(pte)) {
216 __free_page(pte);
217 return NULL;
218 }
219 return pte;
220}
221
222#ifdef CONFIG_3_LEVEL_PGTABLES
223pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
224{
225 pmd_t *pmd = (pmd_t *) __get_free_page(GFP_KERNEL);
226
227 if (pmd)
228 memset(pmd, 0, PAGE_SIZE);
229
230 return pmd;
231}
232#endif
233
234void *uml_kmalloc(int size, int flags)
235{
236 return kmalloc(size, flags);
237}
1/*
2 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3 * Licensed under the GPL
4 */
5
6#include <linux/stddef.h>
7#include <linux/module.h>
8#include <linux/bootmem.h>
9#include <linux/highmem.h>
10#include <linux/mm.h>
11#include <linux/swap.h>
12#include <linux/slab.h>
13#include <asm/fixmap.h>
14#include <asm/page.h>
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>
21
22/* allocated in paging_init, zeroed in mem_init, and unchanged thereafter */
23unsigned long *empty_zero_page = NULL;
24EXPORT_SYMBOL(empty_zero_page);
25/* allocated in paging_init and unchanged thereafter */
26static unsigned long *empty_bad_page = NULL;
27
28/*
29 * Initialized during boot, and readonly for initializing page tables
30 * afterwards
31 */
32pgd_t swapper_pg_dir[PTRS_PER_PGD];
33
34/* Initialized at boot time, and readonly after that */
35unsigned long long highmem;
36int kmalloc_ok = 0;
37
38/* Used during early boot */
39static unsigned long brk_end;
40
41void __init mem_init(void)
42{
43 /* clear the zero-page */
44 memset(empty_zero_page, 0, PAGE_SIZE);
45
46 /* Map in the area just after the brk now that kmalloc is about
47 * to be turned on.
48 */
49 brk_end = (unsigned long) UML_ROUND_UP(sbrk(0));
50 map_memory(brk_end, __pa(brk_end), uml_reserved - brk_end, 1, 1, 0);
51 free_bootmem(__pa(brk_end), uml_reserved - brk_end);
52 uml_reserved = brk_end;
53
54 /* this will put all low memory onto the freelists */
55 free_all_bootmem();
56 max_low_pfn = totalram_pages;
57 max_pfn = totalram_pages;
58 mem_init_print_info(NULL);
59 kmalloc_ok = 1;
60}
61
62/*
63 * Create a page table and place a pointer to it in a middle page
64 * directory entry.
65 */
66static void __init one_page_table_init(pmd_t *pmd)
67{
68 if (pmd_none(*pmd)) {
69 pte_t *pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
70 set_pmd(pmd, __pmd(_KERNPG_TABLE +
71 (unsigned long) __pa(pte)));
72 if (pte != pte_offset_kernel(pmd, 0))
73 BUG();
74 }
75}
76
77static void __init one_md_table_init(pud_t *pud)
78{
79#ifdef CONFIG_3_LEVEL_PGTABLES
80 pmd_t *pmd_table = (pmd_t *) alloc_bootmem_low_pages(PAGE_SIZE);
81 set_pud(pud, __pud(_KERNPG_TABLE + (unsigned long) __pa(pmd_table)));
82 if (pmd_table != pmd_offset(pud, 0))
83 BUG();
84#endif
85}
86
87static void __init fixrange_init(unsigned long start, unsigned long end,
88 pgd_t *pgd_base)
89{
90 pgd_t *pgd;
91 pud_t *pud;
92 pmd_t *pmd;
93 int i, j;
94 unsigned long vaddr;
95
96 vaddr = start;
97 i = pgd_index(vaddr);
98 j = pmd_index(vaddr);
99 pgd = pgd_base + i;
100
101 for ( ; (i < PTRS_PER_PGD) && (vaddr < end); pgd++, i++) {
102 pud = pud_offset(pgd, vaddr);
103 if (pud_none(*pud))
104 one_md_table_init(pud);
105 pmd = pmd_offset(pud, vaddr);
106 for (; (j < PTRS_PER_PMD) && (vaddr < end); pmd++, j++) {
107 one_page_table_init(pmd);
108 vaddr += PMD_SIZE;
109 }
110 j = 0;
111 }
112}
113
114static void __init fixaddr_user_init( void)
115{
116#ifdef CONFIG_ARCH_REUSE_HOST_VSYSCALL_AREA
117 long size = FIXADDR_USER_END - FIXADDR_USER_START;
118 pgd_t *pgd;
119 pud_t *pud;
120 pmd_t *pmd;
121 pte_t *pte;
122 phys_t p;
123 unsigned long v, vaddr = FIXADDR_USER_START;
124
125 if (!size)
126 return;
127
128 fixrange_init( FIXADDR_USER_START, FIXADDR_USER_END, swapper_pg_dir);
129 v = (unsigned long) alloc_bootmem_low_pages(size);
130 memcpy((void *) v , (void *) FIXADDR_USER_START, size);
131 p = __pa(v);
132 for ( ; size > 0; size -= PAGE_SIZE, vaddr += PAGE_SIZE,
133 p += PAGE_SIZE) {
134 pgd = swapper_pg_dir + pgd_index(vaddr);
135 pud = pud_offset(pgd, vaddr);
136 pmd = pmd_offset(pud, vaddr);
137 pte = pte_offset_kernel(pmd, vaddr);
138 pte_set_val(*pte, p, PAGE_READONLY);
139 }
140#endif
141}
142
143void __init paging_init(void)
144{
145 unsigned long zones_size[MAX_NR_ZONES], vaddr;
146 int i;
147
148 empty_zero_page = (unsigned long *) alloc_bootmem_low_pages(PAGE_SIZE);
149 empty_bad_page = (unsigned long *) alloc_bootmem_low_pages(PAGE_SIZE);
150 for (i = 0; i < ARRAY_SIZE(zones_size); i++)
151 zones_size[i] = 0;
152
153 zones_size[ZONE_NORMAL] = (end_iomem >> PAGE_SHIFT) -
154 (uml_physmem >> PAGE_SHIFT);
155 free_area_init(zones_size);
156
157 /*
158 * Fixed mappings, only the page table structure has to be
159 * created - mappings will be set by set_fixmap():
160 */
161 vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
162 fixrange_init(vaddr, FIXADDR_TOP, swapper_pg_dir);
163
164 fixaddr_user_init();
165}
166
167/*
168 * This can't do anything because nothing in the kernel image can be freed
169 * since it's not in kernel physical memory.
170 */
171
172void free_initmem(void)
173{
174}
175
176#ifdef CONFIG_BLK_DEV_INITRD
177void free_initrd_mem(unsigned long start, unsigned long end)
178{
179 free_reserved_area((void *)start, (void *)end, -1, "initrd");
180}
181#endif
182
183/* Allocate and free page tables. */
184
185pgd_t *pgd_alloc(struct mm_struct *mm)
186{
187 pgd_t *pgd = (pgd_t *)__get_free_page(GFP_KERNEL);
188
189 if (pgd) {
190 memset(pgd, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
191 memcpy(pgd + USER_PTRS_PER_PGD,
192 swapper_pg_dir + USER_PTRS_PER_PGD,
193 (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
194 }
195 return pgd;
196}
197
198void pgd_free(struct mm_struct *mm, pgd_t *pgd)
199{
200 free_page((unsigned long) pgd);
201}
202
203pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
204{
205 pte_t *pte;
206
207 pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_ZERO);
208 return pte;
209}
210
211pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address)
212{
213 struct page *pte;
214
215 pte = alloc_page(GFP_KERNEL|__GFP_ZERO);
216 if (!pte)
217 return NULL;
218 if (!pgtable_page_ctor(pte)) {
219 __free_page(pte);
220 return NULL;
221 }
222 return pte;
223}
224
225#ifdef CONFIG_3_LEVEL_PGTABLES
226pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
227{
228 pmd_t *pmd = (pmd_t *) __get_free_page(GFP_KERNEL);
229
230 if (pmd)
231 memset(pmd, 0, PAGE_SIZE);
232
233 return pmd;
234}
235#endif
236
237void *uml_kmalloc(int size, int flags)
238{
239 return kmalloc(size, flags);
240}