4 #define IND_DESTINATION_BIT 0
5 #define IND_INDIRECTION_BIT 1
7 #define IND_SOURCE_BIT 3
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 #define IND_FLAGS (IND_DESTINATION | IND_INDIRECTION | IND_DONE | IND_SOURCE)
15 #if !defined(__ASSEMBLY__)
19 #include <uapi/linux/kexec.h>
21 #ifdef CONFIG_KEXEC_CORE
22 #include <linux/list.h>
23 #include <linux/linkage.h>
24 #include <linux/compat.h>
25 #include <linux/ioport.h>
26 #include <linux/elfcore.h>
27 #include <linux/elf.h>
28 #include <linux/module.h>
29 #include <asm/kexec.h>
31 /* Verify architecture specific macros are defined */
33 #ifndef KEXEC_SOURCE_MEMORY_LIMIT
34 #error KEXEC_SOURCE_MEMORY_LIMIT not defined
37 #ifndef KEXEC_DESTINATION_MEMORY_LIMIT
38 #error KEXEC_DESTINATION_MEMORY_LIMIT not defined
41 #ifndef KEXEC_CONTROL_MEMORY_LIMIT
42 #error KEXEC_CONTROL_MEMORY_LIMIT not defined
45 #ifndef KEXEC_CONTROL_MEMORY_GFP
46 #define KEXEC_CONTROL_MEMORY_GFP (GFP_KERNEL | __GFP_NORETRY)
49 #ifndef KEXEC_CONTROL_PAGE_SIZE
50 #error KEXEC_CONTROL_PAGE_SIZE not defined
54 #error KEXEC_ARCH not defined
57 #ifndef KEXEC_CRASH_CONTROL_MEMORY_LIMIT
58 #define KEXEC_CRASH_CONTROL_MEMORY_LIMIT KEXEC_CONTROL_MEMORY_LIMIT
61 #ifndef KEXEC_CRASH_MEM_ALIGN
62 #define KEXEC_CRASH_MEM_ALIGN PAGE_SIZE
65 #define KEXEC_NOTE_HEAD_BYTES ALIGN(sizeof(struct elf_note), 4)
66 #define KEXEC_CORE_NOTE_NAME "CORE"
67 #define KEXEC_CORE_NOTE_NAME_BYTES ALIGN(sizeof(KEXEC_CORE_NOTE_NAME), 4)
68 #define KEXEC_CORE_NOTE_DESC_BYTES ALIGN(sizeof(struct elf_prstatus), 4)
70 * The per-cpu notes area is a list of notes terminated by a "NULL"
71 * note header. For kdump, the code in vmcore.c runs in the context
72 * of the second kernel to combine them into one note.
74 #ifndef KEXEC_NOTE_BYTES
75 #define KEXEC_NOTE_BYTES ( (KEXEC_NOTE_HEAD_BYTES * 2) + \
76 KEXEC_CORE_NOTE_NAME_BYTES + \
77 KEXEC_CORE_NOTE_DESC_BYTES )
81 * This structure is used to hold the arguments that are used when loading
85 typedef unsigned long kimage_entry_t
;
87 struct kexec_segment
{
89 * This pointer can point to user memory if kexec_load() system
90 * call is used or will point to kernel memory if
91 * kexec_file_load() system call is used.
93 * Use ->buf when expecting to deal with user memory and use ->kbuf
94 * when expecting to deal with kernel memory.
106 struct compat_kexec_segment
{
109 compat_ulong_t mem
; /* User space sees this as a (void *) ... */
114 #ifdef CONFIG_KEXEC_FILE
115 struct purgatory_info
{
116 /* Pointer to elf header of read only purgatory */
119 /* Pointer to purgatory sechdrs which are modifiable */
122 * Temporary buffer location where purgatory is loaded and relocated
123 * This memory can be freed post image load
127 /* Address where purgatory is finally loaded and is executed from */
128 unsigned long purgatory_load_addr
;
131 typedef int (kexec_probe_t
)(const char *kernel_buf
, unsigned long kernel_size
);
132 typedef void *(kexec_load_t
)(struct kimage
*image
, char *kernel_buf
,
133 unsigned long kernel_len
, char *initrd
,
134 unsigned long initrd_len
, char *cmdline
,
135 unsigned long cmdline_len
);
136 typedef int (kexec_cleanup_t
)(void *loader_data
);
138 #ifdef CONFIG_KEXEC_VERIFY_SIG
139 typedef int (kexec_verify_sig_t
)(const char *kernel_buf
,
140 unsigned long kernel_len
);
143 struct kexec_file_ops
{
144 kexec_probe_t
*probe
;
146 kexec_cleanup_t
*cleanup
;
147 #ifdef CONFIG_KEXEC_VERIFY_SIG
148 kexec_verify_sig_t
*verify_sig
;
155 kimage_entry_t
*entry
;
156 kimage_entry_t
*last_entry
;
159 struct page
*control_code_page
;
160 struct page
*swap_page
;
162 unsigned long nr_segments
;
163 struct kexec_segment segment
[KEXEC_SEGMENT_MAX
];
165 struct list_head control_pages
;
166 struct list_head dest_pages
;
167 struct list_head unusable_pages
;
169 /* Address of next control page to allocate for crash kernels. */
170 unsigned long control_page
;
172 /* Flags to indicate special processing */
173 unsigned int type
: 1;
174 #define KEXEC_TYPE_DEFAULT 0
175 #define KEXEC_TYPE_CRASH 1
176 unsigned int preserve_context
: 1;
177 /* If set, we are using file mode kexec syscall */
178 unsigned int file_mode
:1;
180 #ifdef ARCH_HAS_KIMAGE_ARCH
181 struct kimage_arch arch
;
184 #ifdef CONFIG_KEXEC_FILE
185 /* Additional fields for file based kexec syscall */
187 unsigned long kernel_buf_len
;
190 unsigned long initrd_buf_len
;
193 unsigned long cmdline_buf_len
;
195 /* File operations provided by image loader */
196 struct kexec_file_ops
*fops
;
198 /* Image loader handling the kernel can store a pointer here */
199 void *image_loader_data
;
201 /* Information for loading purgatory */
202 struct purgatory_info purgatory_info
;
206 /* kexec interface functions */
207 extern void machine_kexec(struct kimage
*image
);
208 extern int machine_kexec_prepare(struct kimage
*image
);
209 extern void machine_kexec_cleanup(struct kimage
*image
);
210 extern asmlinkage
long sys_kexec_load(unsigned long entry
,
211 unsigned long nr_segments
,
212 struct kexec_segment __user
*segments
,
213 unsigned long flags
);
214 extern int kernel_kexec(void);
215 extern int kexec_add_buffer(struct kimage
*image
, char *buffer
,
216 unsigned long bufsz
, unsigned long memsz
,
217 unsigned long buf_align
, unsigned long buf_min
,
218 unsigned long buf_max
, bool top_down
,
219 unsigned long *load_addr
);
220 extern struct page
*kimage_alloc_control_pages(struct kimage
*image
,
222 extern int kexec_load_purgatory(struct kimage
*image
, unsigned long min
,
223 unsigned long max
, int top_down
,
224 unsigned long *load_addr
);
225 extern int kexec_purgatory_get_set_symbol(struct kimage
*image
,
226 const char *name
, void *buf
,
227 unsigned int size
, bool get_value
);
228 extern void *kexec_purgatory_get_symbol_addr(struct kimage
*image
,
230 extern void __crash_kexec(struct pt_regs
*);
231 extern void crash_kexec(struct pt_regs
*);
232 int kexec_should_crash(struct task_struct
*);
233 int kexec_crash_loaded(void);
234 void crash_save_cpu(struct pt_regs
*regs
, int cpu
);
235 void crash_save_vmcoreinfo(void);
236 void arch_crash_save_vmcoreinfo(void);
238 void vmcoreinfo_append_str(const char *fmt
, ...);
239 phys_addr_t
paddr_vmcoreinfo_note(void);
241 #define VMCOREINFO_OSRELEASE(value) \
242 vmcoreinfo_append_str("OSRELEASE=%s\n", value)
243 #define VMCOREINFO_PAGESIZE(value) \
244 vmcoreinfo_append_str("PAGESIZE=%ld\n", value)
245 #define VMCOREINFO_SYMBOL(name) \
246 vmcoreinfo_append_str("SYMBOL(%s)=%lx\n", #name, (unsigned long)&name)
247 #define VMCOREINFO_SIZE(name) \
248 vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \
249 (unsigned long)sizeof(name))
250 #define VMCOREINFO_STRUCT_SIZE(name) \
251 vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \
252 (unsigned long)sizeof(struct name))
253 #define VMCOREINFO_OFFSET(name, field) \
254 vmcoreinfo_append_str("OFFSET(%s.%s)=%lu\n", #name, #field, \
255 (unsigned long)offsetof(struct name, field))
256 #define VMCOREINFO_LENGTH(name, value) \
257 vmcoreinfo_append_str("LENGTH(%s)=%lu\n", #name, (unsigned long)value)
258 #define VMCOREINFO_NUMBER(name) \
259 vmcoreinfo_append_str("NUMBER(%s)=%ld\n", #name, (long)name)
260 #define VMCOREINFO_CONFIG(name) \
261 vmcoreinfo_append_str("CONFIG_%s=y\n", #name)
263 extern struct kimage
*kexec_image
;
264 extern struct kimage
*kexec_crash_image
;
265 extern int kexec_load_disabled
;
267 #ifndef kexec_flush_icache_page
268 #define kexec_flush_icache_page(page)
271 /* List of defined/legal kexec flags */
272 #ifndef CONFIG_KEXEC_JUMP
273 #define KEXEC_FLAGS KEXEC_ON_CRASH
275 #define KEXEC_FLAGS (KEXEC_ON_CRASH | KEXEC_PRESERVE_CONTEXT)
278 /* List of defined/legal kexec file flags */
279 #define KEXEC_FILE_FLAGS (KEXEC_FILE_UNLOAD | KEXEC_FILE_ON_CRASH | \
280 KEXEC_FILE_NO_INITRAMFS)
282 #define VMCOREINFO_BYTES (4096)
283 #define VMCOREINFO_NOTE_NAME "VMCOREINFO"
284 #define VMCOREINFO_NOTE_NAME_BYTES ALIGN(sizeof(VMCOREINFO_NOTE_NAME), 4)
285 #define VMCOREINFO_NOTE_SIZE (KEXEC_NOTE_HEAD_BYTES*2 + VMCOREINFO_BYTES \
286 + VMCOREINFO_NOTE_NAME_BYTES)
288 /* Location of a reserved region to hold the crash kernel.
290 extern struct resource crashk_res
;
291 extern struct resource crashk_low_res
;
292 typedef u32 note_buf_t
[KEXEC_NOTE_BYTES
/4];
293 extern note_buf_t __percpu
*crash_notes
;
294 extern u32 vmcoreinfo_note
[VMCOREINFO_NOTE_SIZE
/4];
295 extern size_t vmcoreinfo_size
;
296 extern size_t vmcoreinfo_max_size
;
298 /* flag to track if kexec reboot is in progress */
299 extern bool kexec_in_progress
;
301 int __init
parse_crashkernel(char *cmdline
, unsigned long long system_ram
,
302 unsigned long long *crash_size
, unsigned long long *crash_base
);
303 int parse_crashkernel_high(char *cmdline
, unsigned long long system_ram
,
304 unsigned long long *crash_size
, unsigned long long *crash_base
);
305 int parse_crashkernel_low(char *cmdline
, unsigned long long system_ram
,
306 unsigned long long *crash_size
, unsigned long long *crash_base
);
307 int crash_shrink_memory(unsigned long new_size
);
308 size_t crash_get_memory_size(void);
309 void crash_free_reserved_phys_range(unsigned long begin
, unsigned long end
);
311 int __weak
arch_kexec_kernel_image_probe(struct kimage
*image
, void *buf
,
312 unsigned long buf_len
);
313 void * __weak
arch_kexec_kernel_image_load(struct kimage
*image
);
314 int __weak
arch_kimage_file_post_load_cleanup(struct kimage
*image
);
315 int __weak
arch_kexec_kernel_verify_sig(struct kimage
*image
, void *buf
,
316 unsigned long buf_len
);
317 int __weak
arch_kexec_apply_relocations_add(const Elf_Ehdr
*ehdr
,
318 Elf_Shdr
*sechdrs
, unsigned int relsec
);
319 int __weak
arch_kexec_apply_relocations(const Elf_Ehdr
*ehdr
, Elf_Shdr
*sechdrs
,
320 unsigned int relsec
);
321 void arch_kexec_protect_crashkres(void);
322 void arch_kexec_unprotect_crashkres(void);
324 #ifndef page_to_boot_pfn
325 static inline unsigned long page_to_boot_pfn(struct page
*page
)
327 return page_to_pfn(page
);
331 #ifndef boot_pfn_to_page
332 static inline struct page
*boot_pfn_to_page(unsigned long boot_pfn
)
334 return pfn_to_page(boot_pfn
);
338 #ifndef phys_to_boot_phys
339 static inline unsigned long phys_to_boot_phys(phys_addr_t phys
)
345 #ifndef boot_phys_to_phys
346 static inline phys_addr_t
boot_phys_to_phys(unsigned long boot_phys
)
352 static inline unsigned long virt_to_boot_phys(void *addr
)
354 return phys_to_boot_phys(__pa((unsigned long)addr
));
357 static inline void *boot_phys_to_virt(unsigned long entry
)
359 return phys_to_virt(boot_phys_to_phys(entry
));
362 #else /* !CONFIG_KEXEC_CORE */
365 static inline void __crash_kexec(struct pt_regs
*regs
) { }
366 static inline void crash_kexec(struct pt_regs
*regs
) { }
367 static inline int kexec_should_crash(struct task_struct
*p
) { return 0; }
368 static inline int kexec_crash_loaded(void) { return 0; }
369 #define kexec_in_progress false
370 #endif /* CONFIG_KEXEC_CORE */
372 #endif /* !defined(__ASSEBMLY__) */
374 #endif /* LINUX_KEXEC_H */