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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) | |
b28c2ee8 | 13 | #define IND_FLAGS (IND_DESTINATION | IND_INDIRECTION | IND_DONE | IND_SOURCE) |
cf2df639 GL |
14 | |
15 | #if !defined(__ASSEMBLY__) | |
16 | ||
692f66f2 | 17 | #include <linux/crash_core.h> |
43546d86 RK |
18 | #include <asm/io.h> |
19 | ||
607ca46e | 20 | #include <uapi/linux/kexec.h> |
29a5c67e | 21 | |
2965faa5 | 22 | #ifdef CONFIG_KEXEC_CORE |
dc009d92 | 23 | #include <linux/list.h> |
dc009d92 | 24 | #include <linux/compat.h> |
9c15e852 | 25 | #include <linux/ioport.h> |
12db5562 | 26 | #include <linux/module.h> |
dc009d92 EB |
27 | #include <asm/kexec.h> |
28 | ||
29 | /* Verify architecture specific macros are defined */ | |
30 | ||
31 | #ifndef KEXEC_SOURCE_MEMORY_LIMIT | |
32 | #error KEXEC_SOURCE_MEMORY_LIMIT not defined | |
33 | #endif | |
34 | ||
35 | #ifndef KEXEC_DESTINATION_MEMORY_LIMIT | |
36 | #error KEXEC_DESTINATION_MEMORY_LIMIT not defined | |
37 | #endif | |
38 | ||
39 | #ifndef KEXEC_CONTROL_MEMORY_LIMIT | |
40 | #error KEXEC_CONTROL_MEMORY_LIMIT not defined | |
41 | #endif | |
42 | ||
7e01b5ac | 43 | #ifndef KEXEC_CONTROL_MEMORY_GFP |
dc5cccac | 44 | #define KEXEC_CONTROL_MEMORY_GFP (GFP_KERNEL | __GFP_NORETRY) |
7e01b5ac MS |
45 | #endif |
46 | ||
163f6876 HY |
47 | #ifndef KEXEC_CONTROL_PAGE_SIZE |
48 | #error KEXEC_CONTROL_PAGE_SIZE not defined | |
dc009d92 EB |
49 | #endif |
50 | ||
51 | #ifndef KEXEC_ARCH | |
52 | #error KEXEC_ARCH not defined | |
53 | #endif | |
54 | ||
3d214fae MH |
55 | #ifndef KEXEC_CRASH_CONTROL_MEMORY_LIMIT |
56 | #define KEXEC_CRASH_CONTROL_MEMORY_LIMIT KEXEC_CONTROL_MEMORY_LIMIT | |
57 | #endif | |
58 | ||
558df720 MH |
59 | #ifndef KEXEC_CRASH_MEM_ALIGN |
60 | #define KEXEC_CRASH_MEM_ALIGN PAGE_SIZE | |
61 | #endif | |
62 | ||
692f66f2 HB |
63 | #define KEXEC_CORE_NOTE_NAME CRASH_CORE_NOTE_NAME |
64 | ||
6672f76a SH |
65 | /* |
66 | * The per-cpu notes area is a list of notes terminated by a "NULL" | |
67 | * note header. For kdump, the code in vmcore.c runs in the context | |
68 | * of the second kernel to combine them into one note. | |
69 | */ | |
cb78edfd | 70 | #ifndef KEXEC_NOTE_BYTES |
692f66f2 | 71 | #define KEXEC_NOTE_BYTES CRASH_CORE_NOTE_BYTES |
cb78edfd | 72 | #endif |
6672f76a | 73 | |
dc009d92 EB |
74 | /* |
75 | * This structure is used to hold the arguments that are used when loading | |
76 | * kernel binaries. | |
77 | */ | |
78 | ||
79 | typedef unsigned long kimage_entry_t; | |
dc009d92 | 80 | |
dc009d92 | 81 | struct kexec_segment { |
815d5704 VG |
82 | /* |
83 | * This pointer can point to user memory if kexec_load() system | |
84 | * call is used or will point to kernel memory if | |
85 | * kexec_file_load() system call is used. | |
86 | * | |
87 | * Use ->buf when expecting to deal with user memory and use ->kbuf | |
88 | * when expecting to deal with kernel memory. | |
89 | */ | |
90 | union { | |
91 | void __user *buf; | |
92 | void *kbuf; | |
93 | }; | |
dc009d92 | 94 | size_t bufsz; |
29a5c67e | 95 | unsigned long mem; |
dc009d92 EB |
96 | size_t memsz; |
97 | }; | |
98 | ||
99 | #ifdef CONFIG_COMPAT | |
100 | struct compat_kexec_segment { | |
101 | compat_uptr_t buf; | |
102 | compat_size_t bufsz; | |
103 | compat_ulong_t mem; /* User space sees this as a (void *) ... */ | |
104 | compat_size_t memsz; | |
105 | }; | |
106 | #endif | |
107 | ||
978e30c9 | 108 | #ifdef CONFIG_KEXEC_FILE |
12db5562 VG |
109 | struct purgatory_info { |
110 | /* Pointer to elf header of read only purgatory */ | |
111 | Elf_Ehdr *ehdr; | |
112 | ||
113 | /* Pointer to purgatory sechdrs which are modifiable */ | |
114 | Elf_Shdr *sechdrs; | |
115 | /* | |
116 | * Temporary buffer location where purgatory is loaded and relocated | |
117 | * This memory can be freed post image load | |
118 | */ | |
119 | void *purgatory_buf; | |
120 | ||
121 | /* Address where purgatory is finally loaded and is executed from */ | |
122 | unsigned long purgatory_load_addr; | |
123 | }; | |
124 | ||
978e30c9 XP |
125 | typedef int (kexec_probe_t)(const char *kernel_buf, unsigned long kernel_size); |
126 | typedef void *(kexec_load_t)(struct kimage *image, char *kernel_buf, | |
127 | unsigned long kernel_len, char *initrd, | |
128 | unsigned long initrd_len, char *cmdline, | |
129 | unsigned long cmdline_len); | |
130 | typedef int (kexec_cleanup_t)(void *loader_data); | |
131 | ||
132 | #ifdef CONFIG_KEXEC_VERIFY_SIG | |
133 | typedef int (kexec_verify_sig_t)(const char *kernel_buf, | |
134 | unsigned long kernel_len); | |
135 | #endif | |
136 | ||
137 | struct kexec_file_ops { | |
138 | kexec_probe_t *probe; | |
139 | kexec_load_t *load; | |
140 | kexec_cleanup_t *cleanup; | |
141 | #ifdef CONFIG_KEXEC_VERIFY_SIG | |
142 | kexec_verify_sig_t *verify_sig; | |
143 | #endif | |
144 | }; | |
60fe3910 TJB |
145 | |
146 | /** | |
147 | * struct kexec_buf - parameters for finding a place for a buffer in memory | |
148 | * @image: kexec image in which memory to search. | |
149 | * @buffer: Contents which will be copied to the allocated memory. | |
150 | * @bufsz: Size of @buffer. | |
151 | * @mem: On return will have address of the buffer in memory. | |
152 | * @memsz: Size for the buffer in memory. | |
153 | * @buf_align: Minimum alignment needed. | |
154 | * @buf_min: The buffer can't be placed below this address. | |
155 | * @buf_max: The buffer can't be placed above this address. | |
156 | * @top_down: Allocate from top of memory. | |
157 | */ | |
158 | struct kexec_buf { | |
159 | struct kimage *image; | |
ec2b9bfa | 160 | void *buffer; |
60fe3910 TJB |
161 | unsigned long bufsz; |
162 | unsigned long mem; | |
163 | unsigned long memsz; | |
164 | unsigned long buf_align; | |
165 | unsigned long buf_min; | |
166 | unsigned long buf_max; | |
167 | bool top_down; | |
168 | }; | |
169 | ||
170 | int __weak arch_kexec_walk_mem(struct kexec_buf *kbuf, | |
171 | int (*func)(u64, u64, void *)); | |
ec2b9bfa | 172 | extern int kexec_add_buffer(struct kexec_buf *kbuf); |
e2e806f9 | 173 | int kexec_locate_mem_hole(struct kexec_buf *kbuf); |
60fe3910 | 174 | #endif /* CONFIG_KEXEC_FILE */ |
978e30c9 | 175 | |
dc009d92 EB |
176 | struct kimage { |
177 | kimage_entry_t head; | |
178 | kimage_entry_t *entry; | |
179 | kimage_entry_t *last_entry; | |
180 | ||
dc009d92 EB |
181 | unsigned long start; |
182 | struct page *control_code_page; | |
3ab83521 | 183 | struct page *swap_page; |
dc009d92 EB |
184 | |
185 | unsigned long nr_segments; | |
186 | struct kexec_segment segment[KEXEC_SEGMENT_MAX]; | |
187 | ||
188 | struct list_head control_pages; | |
189 | struct list_head dest_pages; | |
7d3e2bca | 190 | struct list_head unusable_pages; |
dc009d92 EB |
191 | |
192 | /* Address of next control page to allocate for crash kernels. */ | |
193 | unsigned long control_page; | |
194 | ||
195 | /* Flags to indicate special processing */ | |
196 | unsigned int type : 1; | |
197 | #define KEXEC_TYPE_DEFAULT 0 | |
198 | #define KEXEC_TYPE_CRASH 1 | |
3ab83521 | 199 | unsigned int preserve_context : 1; |
cb105258 VG |
200 | /* If set, we are using file mode kexec syscall */ |
201 | unsigned int file_mode:1; | |
92be3d6b HY |
202 | |
203 | #ifdef ARCH_HAS_KIMAGE_ARCH | |
204 | struct kimage_arch arch; | |
205 | #endif | |
cb105258 | 206 | |
978e30c9 | 207 | #ifdef CONFIG_KEXEC_FILE |
cb105258 VG |
208 | /* Additional fields for file based kexec syscall */ |
209 | void *kernel_buf; | |
210 | unsigned long kernel_buf_len; | |
211 | ||
212 | void *initrd_buf; | |
213 | unsigned long initrd_buf_len; | |
214 | ||
215 | char *cmdline_buf; | |
216 | unsigned long cmdline_buf_len; | |
217 | ||
218 | /* File operations provided by image loader */ | |
219 | struct kexec_file_ops *fops; | |
220 | ||
221 | /* Image loader handling the kernel can store a pointer here */ | |
222 | void *image_loader_data; | |
12db5562 VG |
223 | |
224 | /* Information for loading purgatory */ | |
225 | struct purgatory_info purgatory_info; | |
978e30c9 | 226 | #endif |
cb105258 | 227 | }; |
dc009d92 EB |
228 | |
229 | /* kexec interface functions */ | |
3ab83521 | 230 | extern void machine_kexec(struct kimage *image); |
dc009d92 EB |
231 | extern int machine_kexec_prepare(struct kimage *image); |
232 | extern void machine_kexec_cleanup(struct kimage *image); | |
233 | extern asmlinkage long sys_kexec_load(unsigned long entry, | |
72414d3f MS |
234 | unsigned long nr_segments, |
235 | struct kexec_segment __user *segments, | |
236 | unsigned long flags); | |
3ab83521 | 237 | extern int kernel_kexec(void); |
72414d3f MS |
238 | extern struct page *kimage_alloc_control_pages(struct kimage *image, |
239 | unsigned int order); | |
12db5562 VG |
240 | extern int kexec_load_purgatory(struct kimage *image, unsigned long min, |
241 | unsigned long max, int top_down, | |
242 | unsigned long *load_addr); | |
243 | extern int kexec_purgatory_get_set_symbol(struct kimage *image, | |
244 | const char *name, void *buf, | |
245 | unsigned int size, bool get_value); | |
246 | extern void *kexec_purgatory_get_symbol_addr(struct kimage *image, | |
247 | const char *name); | |
7bbee5ca | 248 | extern void __crash_kexec(struct pt_regs *); |
6e274d14 AN |
249 | extern void crash_kexec(struct pt_regs *); |
250 | int kexec_should_crash(struct task_struct *); | |
21db79e8 | 251 | int kexec_crash_loaded(void); |
85916f81 | 252 | void crash_save_cpu(struct pt_regs *regs, int cpu); |
fd59d231 | 253 | |
dc009d92 | 254 | extern struct kimage *kexec_image; |
c330dda9 | 255 | extern struct kimage *kexec_crash_image; |
7984754b | 256 | extern int kexec_load_disabled; |
dc009d92 | 257 | |
a7956113 ZN |
258 | #ifndef kexec_flush_icache_page |
259 | #define kexec_flush_icache_page(page) | |
260 | #endif | |
261 | ||
3ab83521 HY |
262 | /* List of defined/legal kexec flags */ |
263 | #ifndef CONFIG_KEXEC_JUMP | |
264 | #define KEXEC_FLAGS KEXEC_ON_CRASH | |
265 | #else | |
266 | #define KEXEC_FLAGS (KEXEC_ON_CRASH | KEXEC_PRESERVE_CONTEXT) | |
267 | #endif | |
dc009d92 | 268 | |
cb105258 VG |
269 | /* List of defined/legal kexec file flags */ |
270 | #define KEXEC_FILE_FLAGS (KEXEC_FILE_UNLOAD | KEXEC_FILE_ON_CRASH | \ | |
271 | KEXEC_FILE_NO_INITRAMFS) | |
272 | ||
dc009d92 EB |
273 | /* Location of a reserved region to hold the crash kernel. |
274 | */ | |
275 | extern struct resource crashk_res; | |
0212f915 | 276 | extern struct resource crashk_low_res; |
43cf38eb | 277 | extern note_buf_t __percpu *crash_notes; |
dc009d92 | 278 | |
4fc9bbf9 KA |
279 | /* flag to track if kexec reboot is in progress */ |
280 | extern bool kexec_in_progress; | |
281 | ||
06a7f711 AW |
282 | int crash_shrink_memory(unsigned long new_size); |
283 | size_t crash_get_memory_size(void); | |
c0bb9e45 | 284 | void crash_free_reserved_phys_range(unsigned long begin, unsigned long end); |
a7956113 | 285 | |
a43cac0d DY |
286 | int __weak arch_kexec_kernel_image_probe(struct kimage *image, void *buf, |
287 | unsigned long buf_len); | |
288 | void * __weak arch_kexec_kernel_image_load(struct kimage *image); | |
289 | int __weak arch_kimage_file_post_load_cleanup(struct kimage *image); | |
290 | int __weak arch_kexec_kernel_verify_sig(struct kimage *image, void *buf, | |
291 | unsigned long buf_len); | |
292 | int __weak arch_kexec_apply_relocations_add(const Elf_Ehdr *ehdr, | |
293 | Elf_Shdr *sechdrs, unsigned int relsec); | |
294 | int __weak arch_kexec_apply_relocations(const Elf_Ehdr *ehdr, Elf_Shdr *sechdrs, | |
295 | unsigned int relsec); | |
9b492cf5 XP |
296 | void arch_kexec_protect_crashkres(void); |
297 | void arch_kexec_unprotect_crashkres(void); | |
a43cac0d | 298 | |
43546d86 RK |
299 | #ifndef page_to_boot_pfn |
300 | static inline unsigned long page_to_boot_pfn(struct page *page) | |
301 | { | |
302 | return page_to_pfn(page); | |
303 | } | |
304 | #endif | |
305 | ||
306 | #ifndef boot_pfn_to_page | |
307 | static inline struct page *boot_pfn_to_page(unsigned long boot_pfn) | |
308 | { | |
309 | return pfn_to_page(boot_pfn); | |
310 | } | |
311 | #endif | |
312 | ||
313 | #ifndef phys_to_boot_phys | |
314 | static inline unsigned long phys_to_boot_phys(phys_addr_t phys) | |
315 | { | |
316 | return phys; | |
317 | } | |
318 | #endif | |
319 | ||
320 | #ifndef boot_phys_to_phys | |
321 | static inline phys_addr_t boot_phys_to_phys(unsigned long boot_phys) | |
322 | { | |
323 | return boot_phys; | |
324 | } | |
325 | #endif | |
326 | ||
327 | static inline unsigned long virt_to_boot_phys(void *addr) | |
328 | { | |
329 | return phys_to_boot_phys(__pa((unsigned long)addr)); | |
330 | } | |
331 | ||
332 | static inline void *boot_phys_to_virt(unsigned long entry) | |
333 | { | |
334 | return phys_to_virt(boot_phys_to_phys(entry)); | |
335 | } | |
336 | ||
2965faa5 | 337 | #else /* !CONFIG_KEXEC_CORE */ |
6e274d14 AN |
338 | struct pt_regs; |
339 | struct task_struct; | |
7bbee5ca | 340 | static inline void __crash_kexec(struct pt_regs *regs) { } |
6e274d14 AN |
341 | static inline void crash_kexec(struct pt_regs *regs) { } |
342 | static inline int kexec_should_crash(struct task_struct *p) { return 0; } | |
21db79e8 | 343 | static inline int kexec_crash_loaded(void) { return 0; } |
2b94ed24 | 344 | #define kexec_in_progress false |
2965faa5 | 345 | #endif /* CONFIG_KEXEC_CORE */ |
cf2df639 GL |
346 | |
347 | #endif /* !defined(__ASSEBMLY__) */ | |
348 | ||
dc009d92 | 349 | #endif /* LINUX_KEXEC_H */ |