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dc009d92 EB |
1 | #ifndef LINUX_KEXEC_H |
2 | #define LINUX_KEXEC_H | |
3 | ||
cf2df639 GL |
4 | #define IND_DESTINATION_BIT 0 |
5 | #define IND_INDIRECTION_BIT 1 | |
6 | #define IND_DONE_BIT 2 | |
7 | #define IND_SOURCE_BIT 3 | |
8 | ||
9 | #define IND_DESTINATION (1 << IND_DESTINATION_BIT) | |
10 | #define IND_INDIRECTION (1 << IND_INDIRECTION_BIT) | |
11 | #define IND_DONE (1 << IND_DONE_BIT) | |
12 | #define IND_SOURCE (1 << IND_SOURCE_BIT) | |
13 | ||
14 | #if !defined(__ASSEMBLY__) | |
15 | ||
607ca46e | 16 | #include <uapi/linux/kexec.h> |
29a5c67e | 17 | |
29a5c67e | 18 | #ifdef CONFIG_KEXEC |
dc009d92 EB |
19 | #include <linux/list.h> |
20 | #include <linux/linkage.h> | |
21 | #include <linux/compat.h> | |
9c15e852 | 22 | #include <linux/ioport.h> |
6672f76a SH |
23 | #include <linux/elfcore.h> |
24 | #include <linux/elf.h> | |
12db5562 | 25 | #include <linux/module.h> |
dc009d92 EB |
26 | #include <asm/kexec.h> |
27 | ||
28 | /* Verify architecture specific macros are defined */ | |
29 | ||
30 | #ifndef KEXEC_SOURCE_MEMORY_LIMIT | |
31 | #error KEXEC_SOURCE_MEMORY_LIMIT not defined | |
32 | #endif | |
33 | ||
34 | #ifndef KEXEC_DESTINATION_MEMORY_LIMIT | |
35 | #error KEXEC_DESTINATION_MEMORY_LIMIT not defined | |
36 | #endif | |
37 | ||
38 | #ifndef KEXEC_CONTROL_MEMORY_LIMIT | |
39 | #error KEXEC_CONTROL_MEMORY_LIMIT not defined | |
40 | #endif | |
41 | ||
163f6876 HY |
42 | #ifndef KEXEC_CONTROL_PAGE_SIZE |
43 | #error KEXEC_CONTROL_PAGE_SIZE not defined | |
dc009d92 EB |
44 | #endif |
45 | ||
46 | #ifndef KEXEC_ARCH | |
47 | #error KEXEC_ARCH not defined | |
48 | #endif | |
49 | ||
3d214fae MH |
50 | #ifndef KEXEC_CRASH_CONTROL_MEMORY_LIMIT |
51 | #define KEXEC_CRASH_CONTROL_MEMORY_LIMIT KEXEC_CONTROL_MEMORY_LIMIT | |
52 | #endif | |
53 | ||
558df720 MH |
54 | #ifndef KEXEC_CRASH_MEM_ALIGN |
55 | #define KEXEC_CRASH_MEM_ALIGN PAGE_SIZE | |
56 | #endif | |
57 | ||
6672f76a SH |
58 | #define KEXEC_NOTE_HEAD_BYTES ALIGN(sizeof(struct elf_note), 4) |
59 | #define KEXEC_CORE_NOTE_NAME "CORE" | |
60 | #define KEXEC_CORE_NOTE_NAME_BYTES ALIGN(sizeof(KEXEC_CORE_NOTE_NAME), 4) | |
61 | #define KEXEC_CORE_NOTE_DESC_BYTES ALIGN(sizeof(struct elf_prstatus), 4) | |
62 | /* | |
63 | * The per-cpu notes area is a list of notes terminated by a "NULL" | |
64 | * note header. For kdump, the code in vmcore.c runs in the context | |
65 | * of the second kernel to combine them into one note. | |
66 | */ | |
cb78edfd | 67 | #ifndef KEXEC_NOTE_BYTES |
6672f76a SH |
68 | #define KEXEC_NOTE_BYTES ( (KEXEC_NOTE_HEAD_BYTES * 2) + \ |
69 | KEXEC_CORE_NOTE_NAME_BYTES + \ | |
70 | KEXEC_CORE_NOTE_DESC_BYTES ) | |
cb78edfd | 71 | #endif |
6672f76a | 72 | |
dc009d92 EB |
73 | /* |
74 | * This structure is used to hold the arguments that are used when loading | |
75 | * kernel binaries. | |
76 | */ | |
77 | ||
78 | typedef unsigned long kimage_entry_t; | |
dc009d92 | 79 | |
dc009d92 | 80 | struct kexec_segment { |
815d5704 VG |
81 | /* |
82 | * This pointer can point to user memory if kexec_load() system | |
83 | * call is used or will point to kernel memory if | |
84 | * kexec_file_load() system call is used. | |
85 | * | |
86 | * Use ->buf when expecting to deal with user memory and use ->kbuf | |
87 | * when expecting to deal with kernel memory. | |
88 | */ | |
89 | union { | |
90 | void __user *buf; | |
91 | void *kbuf; | |
92 | }; | |
dc009d92 | 93 | size_t bufsz; |
29a5c67e | 94 | unsigned long mem; |
dc009d92 EB |
95 | size_t memsz; |
96 | }; | |
97 | ||
98 | #ifdef CONFIG_COMPAT | |
99 | struct compat_kexec_segment { | |
100 | compat_uptr_t buf; | |
101 | compat_size_t bufsz; | |
102 | compat_ulong_t mem; /* User space sees this as a (void *) ... */ | |
103 | compat_size_t memsz; | |
104 | }; | |
105 | #endif | |
106 | ||
12db5562 VG |
107 | struct kexec_sha_region { |
108 | unsigned long start; | |
109 | unsigned long len; | |
110 | }; | |
111 | ||
112 | struct purgatory_info { | |
113 | /* Pointer to elf header of read only purgatory */ | |
114 | Elf_Ehdr *ehdr; | |
115 | ||
116 | /* Pointer to purgatory sechdrs which are modifiable */ | |
117 | Elf_Shdr *sechdrs; | |
118 | /* | |
119 | * Temporary buffer location where purgatory is loaded and relocated | |
120 | * This memory can be freed post image load | |
121 | */ | |
122 | void *purgatory_buf; | |
123 | ||
124 | /* Address where purgatory is finally loaded and is executed from */ | |
125 | unsigned long purgatory_load_addr; | |
126 | }; | |
127 | ||
dc009d92 EB |
128 | struct kimage { |
129 | kimage_entry_t head; | |
130 | kimage_entry_t *entry; | |
131 | kimage_entry_t *last_entry; | |
132 | ||
dc009d92 EB |
133 | unsigned long start; |
134 | struct page *control_code_page; | |
3ab83521 | 135 | struct page *swap_page; |
dc009d92 EB |
136 | |
137 | unsigned long nr_segments; | |
138 | struct kexec_segment segment[KEXEC_SEGMENT_MAX]; | |
139 | ||
140 | struct list_head control_pages; | |
141 | struct list_head dest_pages; | |
7d3e2bca | 142 | struct list_head unusable_pages; |
dc009d92 EB |
143 | |
144 | /* Address of next control page to allocate for crash kernels. */ | |
145 | unsigned long control_page; | |
146 | ||
147 | /* Flags to indicate special processing */ | |
148 | unsigned int type : 1; | |
149 | #define KEXEC_TYPE_DEFAULT 0 | |
150 | #define KEXEC_TYPE_CRASH 1 | |
3ab83521 | 151 | unsigned int preserve_context : 1; |
cb105258 VG |
152 | /* If set, we are using file mode kexec syscall */ |
153 | unsigned int file_mode:1; | |
92be3d6b HY |
154 | |
155 | #ifdef ARCH_HAS_KIMAGE_ARCH | |
156 | struct kimage_arch arch; | |
157 | #endif | |
cb105258 VG |
158 | |
159 | /* Additional fields for file based kexec syscall */ | |
160 | void *kernel_buf; | |
161 | unsigned long kernel_buf_len; | |
162 | ||
163 | void *initrd_buf; | |
164 | unsigned long initrd_buf_len; | |
165 | ||
166 | char *cmdline_buf; | |
167 | unsigned long cmdline_buf_len; | |
168 | ||
169 | /* File operations provided by image loader */ | |
170 | struct kexec_file_ops *fops; | |
171 | ||
172 | /* Image loader handling the kernel can store a pointer here */ | |
173 | void *image_loader_data; | |
12db5562 VG |
174 | |
175 | /* Information for loading purgatory */ | |
176 | struct purgatory_info purgatory_info; | |
dc009d92 EB |
177 | }; |
178 | ||
cb105258 VG |
179 | /* |
180 | * Keeps track of buffer parameters as provided by caller for requesting | |
181 | * memory placement of buffer. | |
182 | */ | |
183 | struct kexec_buf { | |
184 | struct kimage *image; | |
185 | char *buffer; | |
186 | unsigned long bufsz; | |
669280a1 | 187 | unsigned long mem; |
cb105258 VG |
188 | unsigned long memsz; |
189 | unsigned long buf_align; | |
190 | unsigned long buf_min; | |
191 | unsigned long buf_max; | |
192 | bool top_down; /* allocate from top of memory hole */ | |
193 | }; | |
dc009d92 | 194 | |
cb105258 VG |
195 | typedef int (kexec_probe_t)(const char *kernel_buf, unsigned long kernel_size); |
196 | typedef void *(kexec_load_t)(struct kimage *image, char *kernel_buf, | |
197 | unsigned long kernel_len, char *initrd, | |
198 | unsigned long initrd_len, char *cmdline, | |
199 | unsigned long cmdline_len); | |
27f48d3e | 200 | typedef int (kexec_cleanup_t)(void *loader_data); |
8e7d8381 VG |
201 | typedef int (kexec_verify_sig_t)(const char *kernel_buf, |
202 | unsigned long kernel_len); | |
cb105258 VG |
203 | |
204 | struct kexec_file_ops { | |
205 | kexec_probe_t *probe; | |
206 | kexec_load_t *load; | |
207 | kexec_cleanup_t *cleanup; | |
8e7d8381 | 208 | kexec_verify_sig_t *verify_sig; |
cb105258 | 209 | }; |
dc009d92 EB |
210 | |
211 | /* kexec interface functions */ | |
3ab83521 | 212 | extern void machine_kexec(struct kimage *image); |
dc009d92 EB |
213 | extern int machine_kexec_prepare(struct kimage *image); |
214 | extern void machine_kexec_cleanup(struct kimage *image); | |
215 | extern asmlinkage long sys_kexec_load(unsigned long entry, | |
72414d3f MS |
216 | unsigned long nr_segments, |
217 | struct kexec_segment __user *segments, | |
218 | unsigned long flags); | |
3ab83521 | 219 | extern int kernel_kexec(void); |
cb105258 VG |
220 | extern int kexec_add_buffer(struct kimage *image, char *buffer, |
221 | unsigned long bufsz, unsigned long memsz, | |
222 | unsigned long buf_align, unsigned long buf_min, | |
223 | unsigned long buf_max, bool top_down, | |
224 | unsigned long *load_addr); | |
72414d3f MS |
225 | extern struct page *kimage_alloc_control_pages(struct kimage *image, |
226 | unsigned int order); | |
12db5562 VG |
227 | extern int kexec_load_purgatory(struct kimage *image, unsigned long min, |
228 | unsigned long max, int top_down, | |
229 | unsigned long *load_addr); | |
230 | extern int kexec_purgatory_get_set_symbol(struct kimage *image, | |
231 | const char *name, void *buf, | |
232 | unsigned int size, bool get_value); | |
233 | extern void *kexec_purgatory_get_symbol_addr(struct kimage *image, | |
234 | const char *name); | |
6e274d14 AN |
235 | extern void crash_kexec(struct pt_regs *); |
236 | int kexec_should_crash(struct task_struct *); | |
85916f81 | 237 | void crash_save_cpu(struct pt_regs *regs, int cpu); |
fd59d231 | 238 | void crash_save_vmcoreinfo(void); |
558df720 MH |
239 | void crash_map_reserved_pages(void); |
240 | void crash_unmap_reserved_pages(void); | |
fd59d231 | 241 | void arch_crash_save_vmcoreinfo(void); |
b9075fa9 JP |
242 | __printf(1, 2) |
243 | void vmcoreinfo_append_str(const char *fmt, ...); | |
fd59d231 KO |
244 | unsigned long paddr_vmcoreinfo_note(void); |
245 | ||
c6e2bee2 BW |
246 | #define VMCOREINFO_OSRELEASE(value) \ |
247 | vmcoreinfo_append_str("OSRELEASE=%s\n", value) | |
bba1f603 KO |
248 | #define VMCOREINFO_PAGESIZE(value) \ |
249 | vmcoreinfo_append_str("PAGESIZE=%ld\n", value) | |
bcbba6c1 | 250 | #define VMCOREINFO_SYMBOL(name) \ |
fd59d231 | 251 | vmcoreinfo_append_str("SYMBOL(%s)=%lx\n", #name, (unsigned long)&name) |
bcbba6c1 | 252 | #define VMCOREINFO_SIZE(name) \ |
6cfa062f KO |
253 | vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \ |
254 | (unsigned long)sizeof(name)) | |
c76f860c KO |
255 | #define VMCOREINFO_STRUCT_SIZE(name) \ |
256 | vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \ | |
257 | (unsigned long)sizeof(struct name)) | |
bcbba6c1 | 258 | #define VMCOREINFO_OFFSET(name, field) \ |
d768281e | 259 | vmcoreinfo_append_str("OFFSET(%s.%s)=%lu\n", #name, #field, \ |
1e4f2955 | 260 | (unsigned long)offsetof(struct name, field)) |
bcbba6c1 | 261 | #define VMCOREINFO_LENGTH(name, value) \ |
d768281e | 262 | vmcoreinfo_append_str("LENGTH(%s)=%lu\n", #name, (unsigned long)value) |
bcbba6c1 | 263 | #define VMCOREINFO_NUMBER(name) \ |
6cfa062f | 264 | vmcoreinfo_append_str("NUMBER(%s)=%ld\n", #name, (long)name) |
bcbba6c1 | 265 | #define VMCOREINFO_CONFIG(name) \ |
fd59d231 KO |
266 | vmcoreinfo_append_str("CONFIG_%s=y\n", #name) |
267 | ||
dc009d92 | 268 | extern struct kimage *kexec_image; |
c330dda9 | 269 | extern struct kimage *kexec_crash_image; |
7984754b | 270 | extern int kexec_load_disabled; |
dc009d92 | 271 | |
a7956113 ZN |
272 | #ifndef kexec_flush_icache_page |
273 | #define kexec_flush_icache_page(page) | |
274 | #endif | |
275 | ||
3ab83521 HY |
276 | /* List of defined/legal kexec flags */ |
277 | #ifndef CONFIG_KEXEC_JUMP | |
278 | #define KEXEC_FLAGS KEXEC_ON_CRASH | |
279 | #else | |
280 | #define KEXEC_FLAGS (KEXEC_ON_CRASH | KEXEC_PRESERVE_CONTEXT) | |
281 | #endif | |
dc009d92 | 282 | |
cb105258 VG |
283 | /* List of defined/legal kexec file flags */ |
284 | #define KEXEC_FILE_FLAGS (KEXEC_FILE_UNLOAD | KEXEC_FILE_ON_CRASH | \ | |
285 | KEXEC_FILE_NO_INITRAMFS) | |
286 | ||
fd59d231 KO |
287 | #define VMCOREINFO_BYTES (4096) |
288 | #define VMCOREINFO_NOTE_NAME "VMCOREINFO" | |
289 | #define VMCOREINFO_NOTE_NAME_BYTES ALIGN(sizeof(VMCOREINFO_NOTE_NAME), 4) | |
290 | #define VMCOREINFO_NOTE_SIZE (KEXEC_NOTE_HEAD_BYTES*2 + VMCOREINFO_BYTES \ | |
291 | + VMCOREINFO_NOTE_NAME_BYTES) | |
292 | ||
dc009d92 EB |
293 | /* Location of a reserved region to hold the crash kernel. |
294 | */ | |
295 | extern struct resource crashk_res; | |
0212f915 | 296 | extern struct resource crashk_low_res; |
6672f76a | 297 | typedef u32 note_buf_t[KEXEC_NOTE_BYTES/4]; |
43cf38eb | 298 | extern note_buf_t __percpu *crash_notes; |
fd59d231 | 299 | extern u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4]; |
d768281e KO |
300 | extern size_t vmcoreinfo_size; |
301 | extern size_t vmcoreinfo_max_size; | |
dc009d92 | 302 | |
4fc9bbf9 KA |
303 | /* flag to track if kexec reboot is in progress */ |
304 | extern bool kexec_in_progress; | |
305 | ||
cba63c30 BW |
306 | int __init parse_crashkernel(char *cmdline, unsigned long long system_ram, |
307 | unsigned long long *crash_size, unsigned long long *crash_base); | |
55a20ee7 YL |
308 | int parse_crashkernel_high(char *cmdline, unsigned long long system_ram, |
309 | unsigned long long *crash_size, unsigned long long *crash_base); | |
0212f915 YL |
310 | int parse_crashkernel_low(char *cmdline, unsigned long long system_ram, |
311 | unsigned long long *crash_size, unsigned long long *crash_base); | |
06a7f711 AW |
312 | int crash_shrink_memory(unsigned long new_size); |
313 | size_t crash_get_memory_size(void); | |
c0bb9e45 | 314 | void crash_free_reserved_phys_range(unsigned long begin, unsigned long end); |
a7956113 | 315 | |
dc009d92 | 316 | #else /* !CONFIG_KEXEC */ |
6e274d14 AN |
317 | struct pt_regs; |
318 | struct task_struct; | |
319 | static inline void crash_kexec(struct pt_regs *regs) { } | |
320 | static inline int kexec_should_crash(struct task_struct *p) { return 0; } | |
dc009d92 | 321 | #endif /* CONFIG_KEXEC */ |
cf2df639 GL |
322 | |
323 | #endif /* !defined(__ASSEBMLY__) */ | |
324 | ||
dc009d92 | 325 | #endif /* LINUX_KEXEC_H */ |