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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/bootmem.h>
8#include <linux/highmem.h>
9#include <linux/mm.h>
10#include <linux/swap.h>
11#include <linux/slab.h>
12#include <asm/fixmap.h>
13#include <asm/page.h>
14#include "as-layout.h"
15#include "init.h"
16#include "kern.h"
17#include "kern_util.h"
18#include "mem_user.h"
19#include "os.h"
20
21/* allocated in paging_init, zeroed in mem_init, and unchanged thereafter */
22unsigned long *empty_zero_page = NULL;
23/* allocated in paging_init and unchanged thereafter */
24static unsigned long *empty_bad_page = NULL;
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
39#ifdef CONFIG_HIGHMEM
40static void setup_highmem(unsigned long highmem_start,
41 unsigned long highmem_len)
42{
43 struct page *page;
44 unsigned long highmem_pfn;
45 int i;
46
47 highmem_pfn = __pa(highmem_start) >> PAGE_SHIFT;
48 for (i = 0; i < highmem_len >> PAGE_SHIFT; i++) {
49 page = &mem_map[highmem_pfn + i];
50 ClearPageReserved(page);
51 init_page_count(page);
52 __free_page(page);
53 }
54}
55#endif
56
57void __init mem_init(void)
58{
59 /* clear the zero-page */
60 memset(empty_zero_page, 0, PAGE_SIZE);
61
62 /* Map in the area just after the brk now that kmalloc is about
63 * to be turned on.
64 */
65 brk_end = (unsigned long) UML_ROUND_UP(sbrk(0));
66 map_memory(brk_end, __pa(brk_end), uml_reserved - brk_end, 1, 1, 0);
67 free_bootmem(__pa(brk_end), uml_reserved - brk_end);
68 uml_reserved = brk_end;
69
70 /* this will put all low memory onto the freelists */
71 totalram_pages = free_all_bootmem();
72 max_low_pfn = totalram_pages;
73#ifdef CONFIG_HIGHMEM
74 totalhigh_pages = highmem >> PAGE_SHIFT;
75 totalram_pages += totalhigh_pages;
76#endif
77 num_physpages = totalram_pages;
78 max_pfn = totalram_pages;
79 printk(KERN_INFO "Memory: %luk available\n",
80 nr_free_pages() << (PAGE_SHIFT-10));
81 kmalloc_ok = 1;
82
83#ifdef CONFIG_HIGHMEM
84 setup_highmem(end_iomem, highmem);
85#endif
86}
87
88/*
89 * Create a page table and place a pointer to it in a middle page
90 * directory entry.
91 */
92static void __init one_page_table_init(pmd_t *pmd)
93{
94 if (pmd_none(*pmd)) {
95 pte_t *pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
96 set_pmd(pmd, __pmd(_KERNPG_TABLE +
97 (unsigned long) __pa(pte)));
98 if (pte != pte_offset_kernel(pmd, 0))
99 BUG();
100 }
101}
102
103static void __init one_md_table_init(pud_t *pud)
104{
105#ifdef CONFIG_3_LEVEL_PGTABLES
106 pmd_t *pmd_table = (pmd_t *) alloc_bootmem_low_pages(PAGE_SIZE);
107 set_pud(pud, __pud(_KERNPG_TABLE + (unsigned long) __pa(pmd_table)));
108 if (pmd_table != pmd_offset(pud, 0))
109 BUG();
110#endif
111}
112
113static void __init fixrange_init(unsigned long start, unsigned long end,
114 pgd_t *pgd_base)
115{
116 pgd_t *pgd;
117 pud_t *pud;
118 pmd_t *pmd;
119 int i, j;
120 unsigned long vaddr;
121
122 vaddr = start;
123 i = pgd_index(vaddr);
124 j = pmd_index(vaddr);
125 pgd = pgd_base + i;
126
127 for ( ; (i < PTRS_PER_PGD) && (vaddr < end); pgd++, i++) {
128 pud = pud_offset(pgd, vaddr);
129 if (pud_none(*pud))
130 one_md_table_init(pud);
131 pmd = pmd_offset(pud, vaddr);
132 for (; (j < PTRS_PER_PMD) && (vaddr < end); pmd++, j++) {
133 one_page_table_init(pmd);
134 vaddr += PMD_SIZE;
135 }
136 j = 0;
137 }
138}
139
140#ifdef CONFIG_HIGHMEM
141pte_t *kmap_pte;
142pgprot_t kmap_prot;
143
144#define kmap_get_fixmap_pte(vaddr) \
145 pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), (vaddr)),\
146 (vaddr)), (vaddr))
147
148static void __init kmap_init(void)
149{
150 unsigned long kmap_vstart;
151
152 /* cache the first kmap pte */
153 kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN);
154 kmap_pte = kmap_get_fixmap_pte(kmap_vstart);
155
156 kmap_prot = PAGE_KERNEL;
157}
158
159static void __init init_highmem(void)
160{
161 pgd_t *pgd;
162 pud_t *pud;
163 pmd_t *pmd;
164 pte_t *pte;
165 unsigned long vaddr;
166
167 /*
168 * Permanent kmaps:
169 */
170 vaddr = PKMAP_BASE;
171 fixrange_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, swapper_pg_dir);
172
173 pgd = swapper_pg_dir + pgd_index(vaddr);
174 pud = pud_offset(pgd, vaddr);
175 pmd = pmd_offset(pud, vaddr);
176 pte = pte_offset_kernel(pmd, vaddr);
177 pkmap_page_table = pte;
178
179 kmap_init();
180}
181#endif /* CONFIG_HIGHMEM */
182
183static void __init fixaddr_user_init( void)
184{
185#ifdef CONFIG_ARCH_REUSE_HOST_VSYSCALL_AREA
186 long size = FIXADDR_USER_END - FIXADDR_USER_START;
187 pgd_t *pgd;
188 pud_t *pud;
189 pmd_t *pmd;
190 pte_t *pte;
191 phys_t p;
192 unsigned long v, vaddr = FIXADDR_USER_START;
193
194 if (!size)
195 return;
196
197 fixrange_init( FIXADDR_USER_START, FIXADDR_USER_END, swapper_pg_dir);
198 v = (unsigned long) alloc_bootmem_low_pages(size);
199 memcpy((void *) v , (void *) FIXADDR_USER_START, size);
200 p = __pa(v);
201 for ( ; size > 0; size -= PAGE_SIZE, vaddr += PAGE_SIZE,
202 p += PAGE_SIZE) {
203 pgd = swapper_pg_dir + pgd_index(vaddr);
204 pud = pud_offset(pgd, vaddr);
205 pmd = pmd_offset(pud, vaddr);
206 pte = pte_offset_kernel(pmd, vaddr);
207 pte_set_val(*pte, p, PAGE_READONLY);
208 }
209#endif
210}
211
212void __init paging_init(void)
213{
214 unsigned long zones_size[MAX_NR_ZONES], vaddr;
215 int i;
216
217 empty_zero_page = (unsigned long *) alloc_bootmem_low_pages(PAGE_SIZE);
218 empty_bad_page = (unsigned long *) alloc_bootmem_low_pages(PAGE_SIZE);
219 for (i = 0; i < ARRAY_SIZE(zones_size); i++)
220 zones_size[i] = 0;
221
222 zones_size[ZONE_NORMAL] = (end_iomem >> PAGE_SHIFT) -
223 (uml_physmem >> PAGE_SHIFT);
224#ifdef CONFIG_HIGHMEM
225 zones_size[ZONE_HIGHMEM] = highmem >> PAGE_SHIFT;
226#endif
227 free_area_init(zones_size);
228
229 /*
230 * Fixed mappings, only the page table structure has to be
231 * created - mappings will be set by set_fixmap():
232 */
233 vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
234 fixrange_init(vaddr, FIXADDR_TOP, swapper_pg_dir);
235
236 fixaddr_user_init();
237
238#ifdef CONFIG_HIGHMEM
239 init_highmem();
240#endif
241}
242
243/*
244 * This can't do anything because nothing in the kernel image can be freed
245 * since it's not in kernel physical memory.
246 */
247
248void free_initmem(void)
249{
250}
251
252#ifdef CONFIG_BLK_DEV_INITRD
253void free_initrd_mem(unsigned long start, unsigned long end)
254{
255 if (start < end)
256 printk(KERN_INFO "Freeing initrd memory: %ldk freed\n",
257 (end - start) >> 10);
258 for (; start < end; start += PAGE_SIZE) {
259 ClearPageReserved(virt_to_page(start));
260 init_page_count(virt_to_page(start));
261 free_page(start);
262 totalram_pages++;
263 }
264}
265#endif
266
267/* Allocate and free page tables. */
268
269pgd_t *pgd_alloc(struct mm_struct *mm)
270{
271 pgd_t *pgd = (pgd_t *)__get_free_page(GFP_KERNEL);
272
273 if (pgd) {
274 memset(pgd, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
275 memcpy(pgd + USER_PTRS_PER_PGD,
276 swapper_pg_dir + USER_PTRS_PER_PGD,
277 (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
278 }
279 return pgd;
280}
281
282void pgd_free(struct mm_struct *mm, pgd_t *pgd)
283{
284 free_page((unsigned long) pgd);
285}
286
287pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
288{
289 pte_t *pte;
290
291 pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO);
292 return pte;
293}
294
295pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address)
296{
297 struct page *pte;
298
299 pte = alloc_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO);
300 if (pte)
301 pgtable_page_ctor(pte);
302 return pte;
303}
304
305#ifdef CONFIG_3_LEVEL_PGTABLES
306pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
307{
308 pmd_t *pmd = (pmd_t *) __get_free_page(GFP_KERNEL);
309
310 if (pmd)
311 memset(pmd, 0, PAGE_SIZE);
312
313 return pmd;
314}
315#endif
316
317void *uml_kmalloc(int size, int flags)
318{
319 return kmalloc(size, flags);
320}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
4 */
5
6#include <linux/stddef.h>
7#include <linux/module.h>
8#include <linux/memblock.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;
34EXPORT_SYMBOL(highmem);
35int kmalloc_ok = 0;
36
37/* Used during early boot */
38static unsigned long brk_end;
39
40void __init mem_init(void)
41{
42 /* clear the zero-page */
43 memset(empty_zero_page, 0, PAGE_SIZE);
44
45 /* Map in the area just after the brk now that kmalloc is about
46 * to be turned on.
47 */
48 brk_end = (unsigned long) UML_ROUND_UP(sbrk(0));
49 map_memory(brk_end, __pa(brk_end), uml_reserved - brk_end, 1, 1, 0);
50 memblock_free(__pa(brk_end), uml_reserved - brk_end);
51 uml_reserved = brk_end;
52
53 /* this will put all low memory onto the freelists */
54 memblock_free_all();
55 max_low_pfn = totalram_pages();
56 max_pfn = max_low_pfn;
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 *) memblock_alloc_low(PAGE_SIZE,
68 PAGE_SIZE);
69 if (!pte)
70 panic("%s: Failed to allocate %lu bytes align=%lx\n",
71 __func__, PAGE_SIZE, PAGE_SIZE);
72
73 set_pmd(pmd, __pmd(_KERNPG_TABLE +
74 (unsigned long) __pa(pte)));
75 BUG_ON(pte != pte_offset_kernel(pmd, 0));
76 }
77}
78
79static void __init one_md_table_init(pud_t *pud)
80{
81#ifdef CONFIG_3_LEVEL_PGTABLES
82 pmd_t *pmd_table = (pmd_t *) memblock_alloc_low(PAGE_SIZE, PAGE_SIZE);
83 if (!pmd_table)
84 panic("%s: Failed to allocate %lu bytes align=%lx\n",
85 __func__, PAGE_SIZE, PAGE_SIZE);
86
87 set_pud(pud, __pud(_KERNPG_TABLE + (unsigned long) __pa(pmd_table)));
88 if (pmd_table != pmd_offset(pud, 0))
89 BUG();
90#endif
91}
92
93static void __init fixrange_init(unsigned long start, unsigned long end,
94 pgd_t *pgd_base)
95{
96 pgd_t *pgd;
97 p4d_t *p4d;
98 pud_t *pud;
99 pmd_t *pmd;
100 int i, j;
101 unsigned long vaddr;
102
103 vaddr = start;
104 i = pgd_index(vaddr);
105 j = pmd_index(vaddr);
106 pgd = pgd_base + i;
107
108 for ( ; (i < PTRS_PER_PGD) && (vaddr < end); pgd++, i++) {
109 p4d = p4d_offset(pgd, vaddr);
110 pud = pud_offset(p4d, vaddr);
111 if (pud_none(*pud))
112 one_md_table_init(pud);
113 pmd = pmd_offset(pud, vaddr);
114 for (; (j < PTRS_PER_PMD) && (vaddr < end); pmd++, j++) {
115 one_page_table_init(pmd);
116 vaddr += PMD_SIZE;
117 }
118 j = 0;
119 }
120}
121
122static void __init fixaddr_user_init( void)
123{
124#ifdef CONFIG_ARCH_REUSE_HOST_VSYSCALL_AREA
125 long size = FIXADDR_USER_END - FIXADDR_USER_START;
126 pte_t *pte;
127 phys_t p;
128 unsigned long v, vaddr = FIXADDR_USER_START;
129
130 if (!size)
131 return;
132
133 fixrange_init( FIXADDR_USER_START, FIXADDR_USER_END, swapper_pg_dir);
134 v = (unsigned long) memblock_alloc_low(size, PAGE_SIZE);
135 if (!v)
136 panic("%s: Failed to allocate %lu bytes align=%lx\n",
137 __func__, size, PAGE_SIZE);
138
139 memcpy((void *) v , (void *) FIXADDR_USER_START, size);
140 p = __pa(v);
141 for ( ; size > 0; size -= PAGE_SIZE, vaddr += PAGE_SIZE,
142 p += PAGE_SIZE) {
143 pte = virt_to_kpte(vaddr);
144 pte_set_val(*pte, p, PAGE_READONLY);
145 }
146#endif
147}
148
149void __init paging_init(void)
150{
151 unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0 };
152 unsigned long vaddr;
153
154 empty_zero_page = (unsigned long *) memblock_alloc_low(PAGE_SIZE,
155 PAGE_SIZE);
156 if (!empty_zero_page)
157 panic("%s: Failed to allocate %lu bytes align=%lx\n",
158 __func__, PAGE_SIZE, PAGE_SIZE);
159
160 max_zone_pfn[ZONE_NORMAL] = end_iomem >> PAGE_SHIFT;
161 free_area_init(max_zone_pfn);
162
163 /*
164 * Fixed mappings, only the page table structure has to be
165 * created - mappings will be set by set_fixmap():
166 */
167 vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
168 fixrange_init(vaddr, FIXADDR_TOP, swapper_pg_dir);
169
170 fixaddr_user_init();
171}
172
173/*
174 * This can't do anything because nothing in the kernel image can be freed
175 * since it's not in kernel physical memory.
176 */
177
178void free_initmem(void)
179{
180}
181
182/* Allocate and free page tables. */
183
184pgd_t *pgd_alloc(struct mm_struct *mm)
185{
186 pgd_t *pgd = (pgd_t *)__get_free_page(GFP_KERNEL);
187
188 if (pgd) {
189 memset(pgd, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
190 memcpy(pgd + USER_PTRS_PER_PGD,
191 swapper_pg_dir + USER_PTRS_PER_PGD,
192 (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
193 }
194 return pgd;
195}
196
197void *uml_kmalloc(int size, int flags)
198{
199 return kmalloc(size, flags);
200}