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gerrit-public.fairphone.software / kernel / msm-4.9 / c987d12f8455b19b3b057d63bac3de161bd809fc / . / arch / x86 / power / hibernate_64.c
blob: 6dd000dd793394c398a8d02dd9254d6a68fd963b [file] [log] [blame]
Rafael J. Wysockief8b03f2008-02-09 23:24:09 +0100[diff] [blame]1/*
2 * Hibernation support for x86-64
3 *
4 * Distribute under GPLv2
5 *
6 * Copyright (c) 2007 Rafael J. Wysocki <rjw@sisk.pl>
7 * Copyright (c) 2002 Pavel Machek <pavel@suse.cz>
8 * Copyright (c) 2001 Patrick Mochel <mochel@osdl.org>
9 */
10
11#include <linux/smp.h>
12#include <linux/suspend.h>
13#include <asm/proto.h>
14#include <asm/page.h>
15#include <asm/pgtable.h>
16#include <asm/mtrr.h>
17
18/* References to section boundaries */
19extern const void __nosave_begin, __nosave_end;
20
Rafael J. Wysocki261f0ce2008-02-09 23:24:09 +0100[diff] [blame]21/* Defined in hibernate_asm_64.S */
Rafael J. Wysockief8b03f2008-02-09 23:24:09 +0100[diff] [blame]22extern int restore_image(void);
23
24/*
25 * Address to jump to in the last phase of restore in order to get to the image
26 * kernel's text (this value is passed in the image header).
27 */
28unsigned long restore_jump_address;
29
30/*
31 * Value of the cr3 register from before the hibernation (this value is passed
32 * in the image header).
33 */
34unsigned long restore_cr3;
35
36pgd_t *temp_level4_pgt;
37
38void *relocated_restore_code;
39
40static int res_phys_pud_init(pud_t *pud, unsigned long address, unsigned long end)
41{
42 long i, j;
43
44 i = pud_index(address);
45 pud = pud + i;
46 for (; i < PTRS_PER_PUD; pud++, i++) {
47 unsigned long paddr;
48 pmd_t *pmd;
49
50 paddr = address + i*PUD_SIZE;
51 if (paddr >= end)
52 break;
53
54 pmd = (pmd_t *)get_safe_page(GFP_ATOMIC);
55 if (!pmd)
56 return -ENOMEM;
57 set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE));
58 for (j = 0; j < PTRS_PER_PMD; pmd++, j++, paddr += PMD_SIZE) {
59 unsigned long pe;
60
61 if (paddr >= end)
62 break;
63 pe = __PAGE_KERNEL_LARGE_EXEC | paddr;
64 pe &= __supported_pte_mask;
65 set_pmd(pmd, __pmd(pe));
66 }
67 }
68 return 0;
69}
70
71static int set_up_temporary_mappings(void)
72{
73 unsigned long start, end, next;
74 int error;
75
76 temp_level4_pgt = (pgd_t *)get_safe_page(GFP_ATOMIC);
77 if (!temp_level4_pgt)
78 return -ENOMEM;
79
80 /* It is safe to reuse the original kernel mapping */
81 set_pgd(temp_level4_pgt + pgd_index(__START_KERNEL_map),
82 init_level4_pgt[pgd_index(__START_KERNEL_map)]);
83
84 /* Set up the direct mapping from scratch */
85 start = (unsigned long)pfn_to_kaddr(0);
Yinghai Luc987d122008-06-24 22:14:09 -0700[diff] [blame^]86 end = (unsigned long)pfn_to_kaddr(max_pfn);
Rafael J. Wysockief8b03f2008-02-09 23:24:09 +0100[diff] [blame]87
88 for (; start < end; start = next) {
89 pud_t *pud = (pud_t *)get_safe_page(GFP_ATOMIC);
90 if (!pud)
91 return -ENOMEM;
92 next = start + PGDIR_SIZE;
93 if (next > end)
94 next = end;
95 if ((error = res_phys_pud_init(pud, __pa(start), __pa(next))))
96 return error;
97 set_pgd(temp_level4_pgt + pgd_index(start),
98 mk_kernel_pgd(__pa(pud)));
99 }
100 return 0;
101}
102
103int swsusp_arch_resume(void)
104{
105 int error;
106
107 /* We have got enough memory and from now on we cannot recover */
108 if ((error = set_up_temporary_mappings()))
109 return error;
110
111 relocated_restore_code = (void *)get_safe_page(GFP_ATOMIC);
112 if (!relocated_restore_code)
113 return -ENOMEM;
114 memcpy(relocated_restore_code, &core_restore_code,
115 &restore_registers - &core_restore_code);
116
117 restore_image();
118 return 0;
119}
120
121/*
122 * pfn_is_nosave - check if given pfn is in the 'nosave' section
123 */
124
125int pfn_is_nosave(unsigned long pfn)
126{
127 unsigned long nosave_begin_pfn = __pa_symbol(&__nosave_begin) >> PAGE_SHIFT;
128 unsigned long nosave_end_pfn = PAGE_ALIGN(__pa_symbol(&__nosave_end)) >> PAGE_SHIFT;
129 return (pfn >= nosave_begin_pfn) && (pfn < nosave_end_pfn);
130}
131
132struct restore_data_record {
133 unsigned long jump_address;
134 unsigned long cr3;
135 unsigned long magic;
136};
137
138#define RESTORE_MAGIC 0x0123456789ABCDEFUL
139
140/**
141 * arch_hibernation_header_save - populate the architecture specific part
142 * of a hibernation image header
143 * @addr: address to save the data at
144 */
145int arch_hibernation_header_save(void *addr, unsigned int max_size)
146{
147 struct restore_data_record *rdr = addr;
148
149 if (max_size < sizeof(struct restore_data_record))
150 return -EOVERFLOW;
151 rdr->jump_address = restore_jump_address;
152 rdr->cr3 = restore_cr3;
153 rdr->magic = RESTORE_MAGIC;
154 return 0;
155}
156
157/**
158 * arch_hibernation_header_restore - read the architecture specific data
159 * from the hibernation image header
160 * @addr: address to read the data from
161 */
162int arch_hibernation_header_restore(void *addr)
163{
164 struct restore_data_record *rdr = addr;
165
166 restore_jump_address = rdr->jump_address;
167 restore_cr3 = rdr->cr3;
168 return (rdr->magic == RESTORE_MAGIC) ? 0 : -EINVAL;
169}