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dc009d92 EB |
1 | #ifndef LINUX_KEXEC_H |
2 | #define LINUX_KEXEC_H | |
3 | ||
29a5c67e | 4 | /* kexec system call - It loads the new kernel to boot into. |
5 | * kexec does not sync, or unmount filesystems so if you need | |
6 | * that to happen you need to do that yourself. | |
7 | */ | |
8 | ||
dc009d92 | 9 | #include <linux/types.h> |
29a5c67e | 10 | |
11 | /* kexec flags for different usage scenarios */ | |
12 | #define KEXEC_ON_CRASH 0x00000001 | |
13 | #define KEXEC_PRESERVE_CONTEXT 0x00000002 | |
14 | #define KEXEC_ARCH_MASK 0xffff0000 | |
15 | ||
16 | /* These values match the ELF architecture values. | |
17 | * Unless there is a good reason that should continue to be the case. | |
18 | */ | |
19 | #define KEXEC_ARCH_DEFAULT ( 0 << 16) | |
20 | #define KEXEC_ARCH_386 ( 3 << 16) | |
21 | #define KEXEC_ARCH_X86_64 (62 << 16) | |
22 | #define KEXEC_ARCH_PPC (20 << 16) | |
23 | #define KEXEC_ARCH_PPC64 (21 << 16) | |
24 | #define KEXEC_ARCH_IA_64 (50 << 16) | |
25 | #define KEXEC_ARCH_ARM (40 << 16) | |
26 | #define KEXEC_ARCH_S390 (22 << 16) | |
27 | #define KEXEC_ARCH_SH (42 << 16) | |
28 | #define KEXEC_ARCH_MIPS_LE (10 << 16) | |
29 | #define KEXEC_ARCH_MIPS ( 8 << 16) | |
30 | ||
31 | /* The artificial cap on the number of segments passed to kexec_load. */ | |
32 | #define KEXEC_SEGMENT_MAX 16 | |
33 | ||
34 | #ifndef __KERNEL__ | |
35 | /* | |
36 | * This structure is used to hold the arguments that are used when | |
37 | * loading kernel binaries. | |
38 | */ | |
39 | struct kexec_segment { | |
40 | const void *buf; | |
41 | size_t bufsz; | |
42 | const void *mem; | |
43 | size_t memsz; | |
44 | }; | |
45 | ||
46 | /* Load a new kernel image as described by the kexec_segment array | |
47 | * consisting of passed number of segments at the entry-point address. | |
48 | * The flags allow different useage types. | |
49 | */ | |
50 | extern int kexec_load(void *, size_t, struct kexec_segment *, | |
51 | unsigned long int); | |
52 | #endif /* __KERNEL__ */ | |
53 | ||
54 | #ifdef __KERNEL__ | |
55 | #ifdef CONFIG_KEXEC | |
dc009d92 EB |
56 | #include <linux/list.h> |
57 | #include <linux/linkage.h> | |
58 | #include <linux/compat.h> | |
9c15e852 | 59 | #include <linux/ioport.h> |
6672f76a SH |
60 | #include <linux/elfcore.h> |
61 | #include <linux/elf.h> | |
dc009d92 EB |
62 | #include <asm/kexec.h> |
63 | ||
64 | /* Verify architecture specific macros are defined */ | |
65 | ||
66 | #ifndef KEXEC_SOURCE_MEMORY_LIMIT | |
67 | #error KEXEC_SOURCE_MEMORY_LIMIT not defined | |
68 | #endif | |
69 | ||
70 | #ifndef KEXEC_DESTINATION_MEMORY_LIMIT | |
71 | #error KEXEC_DESTINATION_MEMORY_LIMIT not defined | |
72 | #endif | |
73 | ||
74 | #ifndef KEXEC_CONTROL_MEMORY_LIMIT | |
75 | #error KEXEC_CONTROL_MEMORY_LIMIT not defined | |
76 | #endif | |
77 | ||
163f6876 HY |
78 | #ifndef KEXEC_CONTROL_PAGE_SIZE |
79 | #error KEXEC_CONTROL_PAGE_SIZE not defined | |
dc009d92 EB |
80 | #endif |
81 | ||
82 | #ifndef KEXEC_ARCH | |
83 | #error KEXEC_ARCH not defined | |
84 | #endif | |
85 | ||
3d214fae MH |
86 | #ifndef KEXEC_CRASH_CONTROL_MEMORY_LIMIT |
87 | #define KEXEC_CRASH_CONTROL_MEMORY_LIMIT KEXEC_CONTROL_MEMORY_LIMIT | |
88 | #endif | |
89 | ||
558df720 MH |
90 | #ifndef KEXEC_CRASH_MEM_ALIGN |
91 | #define KEXEC_CRASH_MEM_ALIGN PAGE_SIZE | |
92 | #endif | |
93 | ||
6672f76a SH |
94 | #define KEXEC_NOTE_HEAD_BYTES ALIGN(sizeof(struct elf_note), 4) |
95 | #define KEXEC_CORE_NOTE_NAME "CORE" | |
96 | #define KEXEC_CORE_NOTE_NAME_BYTES ALIGN(sizeof(KEXEC_CORE_NOTE_NAME), 4) | |
97 | #define KEXEC_CORE_NOTE_DESC_BYTES ALIGN(sizeof(struct elf_prstatus), 4) | |
98 | /* | |
99 | * The per-cpu notes area is a list of notes terminated by a "NULL" | |
100 | * note header. For kdump, the code in vmcore.c runs in the context | |
101 | * of the second kernel to combine them into one note. | |
102 | */ | |
cb78edfd | 103 | #ifndef KEXEC_NOTE_BYTES |
6672f76a SH |
104 | #define KEXEC_NOTE_BYTES ( (KEXEC_NOTE_HEAD_BYTES * 2) + \ |
105 | KEXEC_CORE_NOTE_NAME_BYTES + \ | |
106 | KEXEC_CORE_NOTE_DESC_BYTES ) | |
cb78edfd | 107 | #endif |
6672f76a | 108 | |
dc009d92 EB |
109 | /* |
110 | * This structure is used to hold the arguments that are used when loading | |
111 | * kernel binaries. | |
112 | */ | |
113 | ||
114 | typedef unsigned long kimage_entry_t; | |
115 | #define IND_DESTINATION 0x1 | |
116 | #define IND_INDIRECTION 0x2 | |
117 | #define IND_DONE 0x4 | |
118 | #define IND_SOURCE 0x8 | |
119 | ||
dc009d92 EB |
120 | struct kexec_segment { |
121 | void __user *buf; | |
122 | size_t bufsz; | |
29a5c67e | 123 | unsigned long mem; |
dc009d92 EB |
124 | size_t memsz; |
125 | }; | |
126 | ||
127 | #ifdef CONFIG_COMPAT | |
128 | struct compat_kexec_segment { | |
129 | compat_uptr_t buf; | |
130 | compat_size_t bufsz; | |
131 | compat_ulong_t mem; /* User space sees this as a (void *) ... */ | |
132 | compat_size_t memsz; | |
133 | }; | |
134 | #endif | |
135 | ||
136 | struct kimage { | |
137 | kimage_entry_t head; | |
138 | kimage_entry_t *entry; | |
139 | kimage_entry_t *last_entry; | |
140 | ||
141 | unsigned long destination; | |
142 | ||
143 | unsigned long start; | |
144 | struct page *control_code_page; | |
3ab83521 | 145 | struct page *swap_page; |
dc009d92 EB |
146 | |
147 | unsigned long nr_segments; | |
148 | struct kexec_segment segment[KEXEC_SEGMENT_MAX]; | |
149 | ||
150 | struct list_head control_pages; | |
151 | struct list_head dest_pages; | |
152 | struct list_head unuseable_pages; | |
153 | ||
154 | /* Address of next control page to allocate for crash kernels. */ | |
155 | unsigned long control_page; | |
156 | ||
157 | /* Flags to indicate special processing */ | |
158 | unsigned int type : 1; | |
159 | #define KEXEC_TYPE_DEFAULT 0 | |
160 | #define KEXEC_TYPE_CRASH 1 | |
3ab83521 | 161 | unsigned int preserve_context : 1; |
92be3d6b HY |
162 | |
163 | #ifdef ARCH_HAS_KIMAGE_ARCH | |
164 | struct kimage_arch arch; | |
165 | #endif | |
dc009d92 EB |
166 | }; |
167 | ||
168 | ||
169 | ||
170 | /* kexec interface functions */ | |
3ab83521 | 171 | extern void machine_kexec(struct kimage *image); |
dc009d92 EB |
172 | extern int machine_kexec_prepare(struct kimage *image); |
173 | extern void machine_kexec_cleanup(struct kimage *image); | |
174 | extern asmlinkage long sys_kexec_load(unsigned long entry, | |
72414d3f MS |
175 | unsigned long nr_segments, |
176 | struct kexec_segment __user *segments, | |
177 | unsigned long flags); | |
3ab83521 | 178 | extern int kernel_kexec(void); |
dc009d92 EB |
179 | #ifdef CONFIG_COMPAT |
180 | extern asmlinkage long compat_sys_kexec_load(unsigned long entry, | |
72414d3f MS |
181 | unsigned long nr_segments, |
182 | struct compat_kexec_segment __user *segments, | |
183 | unsigned long flags); | |
dc009d92 | 184 | #endif |
72414d3f MS |
185 | extern struct page *kimage_alloc_control_pages(struct kimage *image, |
186 | unsigned int order); | |
6e274d14 AN |
187 | extern void crash_kexec(struct pt_regs *); |
188 | int kexec_should_crash(struct task_struct *); | |
85916f81 | 189 | void crash_save_cpu(struct pt_regs *regs, int cpu); |
fd59d231 | 190 | void crash_save_vmcoreinfo(void); |
558df720 MH |
191 | void crash_map_reserved_pages(void); |
192 | void crash_unmap_reserved_pages(void); | |
fd59d231 | 193 | void arch_crash_save_vmcoreinfo(void); |
b9075fa9 JP |
194 | __printf(1, 2) |
195 | void vmcoreinfo_append_str(const char *fmt, ...); | |
fd59d231 KO |
196 | unsigned long paddr_vmcoreinfo_note(void); |
197 | ||
c6e2bee2 BW |
198 | #define VMCOREINFO_OSRELEASE(value) \ |
199 | vmcoreinfo_append_str("OSRELEASE=%s\n", value) | |
bba1f603 KO |
200 | #define VMCOREINFO_PAGESIZE(value) \ |
201 | vmcoreinfo_append_str("PAGESIZE=%ld\n", value) | |
bcbba6c1 | 202 | #define VMCOREINFO_SYMBOL(name) \ |
fd59d231 | 203 | vmcoreinfo_append_str("SYMBOL(%s)=%lx\n", #name, (unsigned long)&name) |
bcbba6c1 | 204 | #define VMCOREINFO_SIZE(name) \ |
6cfa062f KO |
205 | vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \ |
206 | (unsigned long)sizeof(name)) | |
c76f860c KO |
207 | #define VMCOREINFO_STRUCT_SIZE(name) \ |
208 | vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \ | |
209 | (unsigned long)sizeof(struct name)) | |
bcbba6c1 | 210 | #define VMCOREINFO_OFFSET(name, field) \ |
d768281e | 211 | vmcoreinfo_append_str("OFFSET(%s.%s)=%lu\n", #name, #field, \ |
1e4f2955 | 212 | (unsigned long)offsetof(struct name, field)) |
bcbba6c1 | 213 | #define VMCOREINFO_LENGTH(name, value) \ |
d768281e | 214 | vmcoreinfo_append_str("LENGTH(%s)=%lu\n", #name, (unsigned long)value) |
bcbba6c1 | 215 | #define VMCOREINFO_NUMBER(name) \ |
6cfa062f | 216 | vmcoreinfo_append_str("NUMBER(%s)=%ld\n", #name, (long)name) |
bcbba6c1 | 217 | #define VMCOREINFO_CONFIG(name) \ |
fd59d231 KO |
218 | vmcoreinfo_append_str("CONFIG_%s=y\n", #name) |
219 | ||
dc009d92 | 220 | extern struct kimage *kexec_image; |
c330dda9 | 221 | extern struct kimage *kexec_crash_image; |
dc009d92 | 222 | |
a7956113 ZN |
223 | #ifndef kexec_flush_icache_page |
224 | #define kexec_flush_icache_page(page) | |
225 | #endif | |
226 | ||
3ab83521 HY |
227 | /* List of defined/legal kexec flags */ |
228 | #ifndef CONFIG_KEXEC_JUMP | |
229 | #define KEXEC_FLAGS KEXEC_ON_CRASH | |
230 | #else | |
231 | #define KEXEC_FLAGS (KEXEC_ON_CRASH | KEXEC_PRESERVE_CONTEXT) | |
232 | #endif | |
dc009d92 | 233 | |
fd59d231 KO |
234 | #define VMCOREINFO_BYTES (4096) |
235 | #define VMCOREINFO_NOTE_NAME "VMCOREINFO" | |
236 | #define VMCOREINFO_NOTE_NAME_BYTES ALIGN(sizeof(VMCOREINFO_NOTE_NAME), 4) | |
237 | #define VMCOREINFO_NOTE_SIZE (KEXEC_NOTE_HEAD_BYTES*2 + VMCOREINFO_BYTES \ | |
238 | + VMCOREINFO_NOTE_NAME_BYTES) | |
239 | ||
dc009d92 EB |
240 | /* Location of a reserved region to hold the crash kernel. |
241 | */ | |
242 | extern struct resource crashk_res; | |
6672f76a | 243 | typedef u32 note_buf_t[KEXEC_NOTE_BYTES/4]; |
43cf38eb | 244 | extern note_buf_t __percpu *crash_notes; |
fd59d231 | 245 | extern u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4]; |
d768281e KO |
246 | extern size_t vmcoreinfo_size; |
247 | extern size_t vmcoreinfo_max_size; | |
dc009d92 | 248 | |
cba63c30 BW |
249 | int __init parse_crashkernel(char *cmdline, unsigned long long system_ram, |
250 | unsigned long long *crash_size, unsigned long long *crash_base); | |
06a7f711 AW |
251 | int crash_shrink_memory(unsigned long new_size); |
252 | size_t crash_get_memory_size(void); | |
c0bb9e45 | 253 | void crash_free_reserved_phys_range(unsigned long begin, unsigned long end); |
a7956113 | 254 | |
dc009d92 | 255 | #else /* !CONFIG_KEXEC */ |
6e274d14 AN |
256 | struct pt_regs; |
257 | struct task_struct; | |
258 | static inline void crash_kexec(struct pt_regs *regs) { } | |
259 | static inline int kexec_should_crash(struct task_struct *p) { return 0; } | |
dc009d92 | 260 | #endif /* CONFIG_KEXEC */ |
29a5c67e | 261 | #endif /* __KERNEL__ */ |
dc009d92 | 262 | #endif /* LINUX_KEXEC_H */ |