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dc009d92 EB |
1 | #ifndef LINUX_KEXEC_H |
2 | #define LINUX_KEXEC_H | |
3 | ||
4 | #ifdef CONFIG_KEXEC | |
5 | #include <linux/types.h> | |
6 | #include <linux/list.h> | |
7 | #include <linux/linkage.h> | |
8 | #include <linux/compat.h> | |
9c15e852 | 9 | #include <linux/ioport.h> |
6672f76a SH |
10 | #include <linux/elfcore.h> |
11 | #include <linux/elf.h> | |
dc009d92 EB |
12 | #include <asm/kexec.h> |
13 | ||
14 | /* Verify architecture specific macros are defined */ | |
15 | ||
16 | #ifndef KEXEC_SOURCE_MEMORY_LIMIT | |
17 | #error KEXEC_SOURCE_MEMORY_LIMIT not defined | |
18 | #endif | |
19 | ||
20 | #ifndef KEXEC_DESTINATION_MEMORY_LIMIT | |
21 | #error KEXEC_DESTINATION_MEMORY_LIMIT not defined | |
22 | #endif | |
23 | ||
24 | #ifndef KEXEC_CONTROL_MEMORY_LIMIT | |
25 | #error KEXEC_CONTROL_MEMORY_LIMIT not defined | |
26 | #endif | |
27 | ||
28 | #ifndef KEXEC_CONTROL_CODE_SIZE | |
29 | #error KEXEC_CONTROL_CODE_SIZE not defined | |
30 | #endif | |
31 | ||
32 | #ifndef KEXEC_ARCH | |
33 | #error KEXEC_ARCH not defined | |
34 | #endif | |
35 | ||
6672f76a SH |
36 | #define KEXEC_NOTE_HEAD_BYTES ALIGN(sizeof(struct elf_note), 4) |
37 | #define KEXEC_CORE_NOTE_NAME "CORE" | |
38 | #define KEXEC_CORE_NOTE_NAME_BYTES ALIGN(sizeof(KEXEC_CORE_NOTE_NAME), 4) | |
39 | #define KEXEC_CORE_NOTE_DESC_BYTES ALIGN(sizeof(struct elf_prstatus), 4) | |
40 | /* | |
41 | * The per-cpu notes area is a list of notes terminated by a "NULL" | |
42 | * note header. For kdump, the code in vmcore.c runs in the context | |
43 | * of the second kernel to combine them into one note. | |
44 | */ | |
45 | #define KEXEC_NOTE_BYTES ( (KEXEC_NOTE_HEAD_BYTES * 2) + \ | |
46 | KEXEC_CORE_NOTE_NAME_BYTES + \ | |
47 | KEXEC_CORE_NOTE_DESC_BYTES ) | |
48 | ||
dc009d92 EB |
49 | /* |
50 | * This structure is used to hold the arguments that are used when loading | |
51 | * kernel binaries. | |
52 | */ | |
53 | ||
54 | typedef unsigned long kimage_entry_t; | |
55 | #define IND_DESTINATION 0x1 | |
56 | #define IND_INDIRECTION 0x2 | |
57 | #define IND_DONE 0x4 | |
58 | #define IND_SOURCE 0x8 | |
59 | ||
720e1a9f | 60 | #define KEXEC_SEGMENT_MAX 16 |
dc009d92 EB |
61 | struct kexec_segment { |
62 | void __user *buf; | |
63 | size_t bufsz; | |
64 | unsigned long mem; /* User space sees this as a (void *) ... */ | |
65 | size_t memsz; | |
66 | }; | |
67 | ||
68 | #ifdef CONFIG_COMPAT | |
69 | struct compat_kexec_segment { | |
70 | compat_uptr_t buf; | |
71 | compat_size_t bufsz; | |
72 | compat_ulong_t mem; /* User space sees this as a (void *) ... */ | |
73 | compat_size_t memsz; | |
74 | }; | |
75 | #endif | |
76 | ||
77 | struct kimage { | |
78 | kimage_entry_t head; | |
79 | kimage_entry_t *entry; | |
80 | kimage_entry_t *last_entry; | |
81 | ||
82 | unsigned long destination; | |
83 | ||
84 | unsigned long start; | |
85 | struct page *control_code_page; | |
86 | ||
87 | unsigned long nr_segments; | |
88 | struct kexec_segment segment[KEXEC_SEGMENT_MAX]; | |
89 | ||
90 | struct list_head control_pages; | |
91 | struct list_head dest_pages; | |
92 | struct list_head unuseable_pages; | |
93 | ||
94 | /* Address of next control page to allocate for crash kernels. */ | |
95 | unsigned long control_page; | |
96 | ||
97 | /* Flags to indicate special processing */ | |
98 | unsigned int type : 1; | |
99 | #define KEXEC_TYPE_DEFAULT 0 | |
100 | #define KEXEC_TYPE_CRASH 1 | |
101 | }; | |
102 | ||
103 | ||
104 | ||
105 | /* kexec interface functions */ | |
106 | extern NORET_TYPE void machine_kexec(struct kimage *image) ATTRIB_NORET; | |
107 | extern int machine_kexec_prepare(struct kimage *image); | |
108 | extern void machine_kexec_cleanup(struct kimage *image); | |
109 | extern asmlinkage long sys_kexec_load(unsigned long entry, | |
72414d3f MS |
110 | unsigned long nr_segments, |
111 | struct kexec_segment __user *segments, | |
112 | unsigned long flags); | |
dc009d92 EB |
113 | #ifdef CONFIG_COMPAT |
114 | extern asmlinkage long compat_sys_kexec_load(unsigned long entry, | |
72414d3f MS |
115 | unsigned long nr_segments, |
116 | struct compat_kexec_segment __user *segments, | |
117 | unsigned long flags); | |
dc009d92 | 118 | #endif |
72414d3f MS |
119 | extern struct page *kimage_alloc_control_pages(struct kimage *image, |
120 | unsigned int order); | |
6e274d14 AN |
121 | extern void crash_kexec(struct pt_regs *); |
122 | int kexec_should_crash(struct task_struct *); | |
85916f81 | 123 | void crash_save_cpu(struct pt_regs *regs, int cpu); |
dc009d92 | 124 | extern struct kimage *kexec_image; |
c330dda9 | 125 | extern struct kimage *kexec_crash_image; |
dc009d92 | 126 | |
a7956113 ZN |
127 | #ifndef kexec_flush_icache_page |
128 | #define kexec_flush_icache_page(page) | |
129 | #endif | |
130 | ||
dc009d92 EB |
131 | #define KEXEC_ON_CRASH 0x00000001 |
132 | #define KEXEC_ARCH_MASK 0xffff0000 | |
133 | ||
134 | /* These values match the ELF architecture values. | |
135 | * Unless there is a good reason that should continue to be the case. | |
136 | */ | |
137 | #define KEXEC_ARCH_DEFAULT ( 0 << 16) | |
138 | #define KEXEC_ARCH_386 ( 3 << 16) | |
139 | #define KEXEC_ARCH_X86_64 (62 << 16) | |
140 | #define KEXEC_ARCH_PPC (20 << 16) | |
141 | #define KEXEC_ARCH_PPC64 (21 << 16) | |
142 | #define KEXEC_ARCH_IA_64 (50 << 16) | |
c587e4a6 | 143 | #define KEXEC_ARCH_ARM (40 << 16) |
cf13f0ea | 144 | #define KEXEC_ARCH_S390 (22 << 16) |
9d44190e | 145 | #define KEXEC_ARCH_SH (42 << 16) |
583bb86f NS |
146 | #define KEXEC_ARCH_MIPS_LE (10 << 16) |
147 | #define KEXEC_ARCH_MIPS ( 8 << 16) | |
dc009d92 EB |
148 | |
149 | #define KEXEC_FLAGS (KEXEC_ON_CRASH) /* List of defined/legal kexec flags */ | |
150 | ||
151 | /* Location of a reserved region to hold the crash kernel. | |
152 | */ | |
153 | extern struct resource crashk_res; | |
6672f76a | 154 | typedef u32 note_buf_t[KEXEC_NOTE_BYTES/4]; |
cc571658 | 155 | extern note_buf_t *crash_notes; |
dc009d92 | 156 | |
a7956113 | 157 | |
dc009d92 | 158 | #else /* !CONFIG_KEXEC */ |
6e274d14 AN |
159 | struct pt_regs; |
160 | struct task_struct; | |
161 | static inline void crash_kexec(struct pt_regs *regs) { } | |
162 | static inline int kexec_should_crash(struct task_struct *p) { return 0; } | |
dc009d92 EB |
163 | #endif /* CONFIG_KEXEC */ |
164 | #endif /* LINUX_KEXEC_H */ |