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__)
17 #include <linux/crash_core.h>
20 #include <uapi/linux/kexec.h>
22 #ifdef CONFIG_KEXEC_CORE
23 #include <linux/list.h>
24 #include <linux/compat.h>
25 #include <linux/ioport.h>
26 #include <linux/module.h>
27 #include <asm/kexec.h>
29 /* Verify architecture specific macros are defined */
31 #ifndef KEXEC_SOURCE_MEMORY_LIMIT
32 #error KEXEC_SOURCE_MEMORY_LIMIT not defined
35 #ifndef KEXEC_DESTINATION_MEMORY_LIMIT
36 #error KEXEC_DESTINATION_MEMORY_LIMIT not defined
39 #ifndef KEXEC_CONTROL_MEMORY_LIMIT
40 #error KEXEC_CONTROL_MEMORY_LIMIT not defined
43 #ifndef KEXEC_CONTROL_MEMORY_GFP
44 #define KEXEC_CONTROL_MEMORY_GFP (GFP_KERNEL | __GFP_NORETRY)
47 #ifndef KEXEC_CONTROL_PAGE_SIZE
48 #error KEXEC_CONTROL_PAGE_SIZE not defined
52 #error KEXEC_ARCH not defined
55 #ifndef KEXEC_CRASH_CONTROL_MEMORY_LIMIT
56 #define KEXEC_CRASH_CONTROL_MEMORY_LIMIT KEXEC_CONTROL_MEMORY_LIMIT
59 #ifndef KEXEC_CRASH_MEM_ALIGN
60 #define KEXEC_CRASH_MEM_ALIGN PAGE_SIZE
63 #define KEXEC_CORE_NOTE_NAME CRASH_CORE_NOTE_NAME
66 * This structure is used to hold the arguments that are used when loading
70 typedef unsigned long kimage_entry_t
;
72 struct kexec_segment
{
74 * This pointer can point to user memory if kexec_load() system
75 * call is used or will point to kernel memory if
76 * kexec_file_load() system call is used.
78 * Use ->buf when expecting to deal with user memory and use ->kbuf
79 * when expecting to deal with kernel memory.
91 struct compat_kexec_segment
{
94 compat_ulong_t mem
; /* User space sees this as a (void *) ... */
99 #ifdef CONFIG_KEXEC_FILE
100 struct purgatory_info
{
101 /* Pointer to elf header of read only purgatory */
104 /* Pointer to purgatory sechdrs which are modifiable */
107 * Temporary buffer location where purgatory is loaded and relocated
108 * This memory can be freed post image load
112 /* Address where purgatory is finally loaded and is executed from */
113 unsigned long purgatory_load_addr
;
116 typedef int (kexec_probe_t
)(const char *kernel_buf
, unsigned long kernel_size
);
117 typedef void *(kexec_load_t
)(struct kimage
*image
, char *kernel_buf
,
118 unsigned long kernel_len
, char *initrd
,
119 unsigned long initrd_len
, char *cmdline
,
120 unsigned long cmdline_len
);
121 typedef int (kexec_cleanup_t
)(void *loader_data
);
123 #ifdef CONFIG_KEXEC_VERIFY_SIG
124 typedef int (kexec_verify_sig_t
)(const char *kernel_buf
,
125 unsigned long kernel_len
);
128 struct kexec_file_ops
{
129 kexec_probe_t
*probe
;
131 kexec_cleanup_t
*cleanup
;
132 #ifdef CONFIG_KEXEC_VERIFY_SIG
133 kexec_verify_sig_t
*verify_sig
;
138 * struct kexec_buf - parameters for finding a place for a buffer in memory
139 * @image: kexec image in which memory to search.
140 * @buffer: Contents which will be copied to the allocated memory.
141 * @bufsz: Size of @buffer.
142 * @mem: On return will have address of the buffer in memory.
143 * @memsz: Size for the buffer in memory.
144 * @buf_align: Minimum alignment needed.
145 * @buf_min: The buffer can't be placed below this address.
146 * @buf_max: The buffer can't be placed above this address.
147 * @top_down: Allocate from top of memory.
150 struct kimage
*image
;
155 unsigned long buf_align
;
156 unsigned long buf_min
;
157 unsigned long buf_max
;
161 int __weak
arch_kexec_walk_mem(struct kexec_buf
*kbuf
,
162 int (*func
)(u64
, u64
, void *));
163 extern int kexec_add_buffer(struct kexec_buf
*kbuf
);
164 int kexec_locate_mem_hole(struct kexec_buf
*kbuf
);
165 #endif /* CONFIG_KEXEC_FILE */
169 kimage_entry_t
*entry
;
170 kimage_entry_t
*last_entry
;
173 struct page
*control_code_page
;
174 struct page
*swap_page
;
176 unsigned long nr_segments
;
177 struct kexec_segment segment
[KEXEC_SEGMENT_MAX
];
179 struct list_head control_pages
;
180 struct list_head dest_pages
;
181 struct list_head unusable_pages
;
183 /* Address of next control page to allocate for crash kernels. */
184 unsigned long control_page
;
186 /* Flags to indicate special processing */
187 unsigned int type
: 1;
188 #define KEXEC_TYPE_DEFAULT 0
189 #define KEXEC_TYPE_CRASH 1
190 unsigned int preserve_context
: 1;
191 /* If set, we are using file mode kexec syscall */
192 unsigned int file_mode
:1;
194 #ifdef ARCH_HAS_KIMAGE_ARCH
195 struct kimage_arch arch
;
198 #ifdef CONFIG_KEXEC_FILE
199 /* Additional fields for file based kexec syscall */
201 unsigned long kernel_buf_len
;
204 unsigned long initrd_buf_len
;
207 unsigned long cmdline_buf_len
;
209 /* File operations provided by image loader */
210 struct kexec_file_ops
*fops
;
212 /* Image loader handling the kernel can store a pointer here */
213 void *image_loader_data
;
215 /* Information for loading purgatory */
216 struct purgatory_info purgatory_info
;
220 /* kexec interface functions */
221 extern void machine_kexec(struct kimage
*image
);
222 extern int machine_kexec_prepare(struct kimage
*image
);
223 extern void machine_kexec_cleanup(struct kimage
*image
);
224 extern asmlinkage
long sys_kexec_load(unsigned long entry
,
225 unsigned long nr_segments
,
226 struct kexec_segment __user
*segments
,
227 unsigned long flags
);
228 extern int kernel_kexec(void);
229 extern struct page
*kimage_alloc_control_pages(struct kimage
*image
,
231 extern int kexec_load_purgatory(struct kimage
*image
, unsigned long min
,
232 unsigned long max
, int top_down
,
233 unsigned long *load_addr
);
234 extern int kexec_purgatory_get_set_symbol(struct kimage
*image
,
235 const char *name
, void *buf
,
236 unsigned int size
, bool get_value
);
237 extern void *kexec_purgatory_get_symbol_addr(struct kimage
*image
,
239 extern void __crash_kexec(struct pt_regs
*);
240 extern void crash_kexec(struct pt_regs
*);
241 int kexec_should_crash(struct task_struct
*);
242 int kexec_crash_loaded(void);
243 void crash_save_cpu(struct pt_regs
*regs
, int cpu
);
245 extern struct kimage
*kexec_image
;
246 extern struct kimage
*kexec_crash_image
;
247 extern int kexec_load_disabled
;
249 #ifndef kexec_flush_icache_page
250 #define kexec_flush_icache_page(page)
253 /* List of defined/legal kexec flags */
254 #ifndef CONFIG_KEXEC_JUMP
255 #define KEXEC_FLAGS KEXEC_ON_CRASH
257 #define KEXEC_FLAGS (KEXEC_ON_CRASH | KEXEC_PRESERVE_CONTEXT)
260 /* List of defined/legal kexec file flags */
261 #define KEXEC_FILE_FLAGS (KEXEC_FILE_UNLOAD | KEXEC_FILE_ON_CRASH | \
262 KEXEC_FILE_NO_INITRAMFS)
264 /* Location of a reserved region to hold the crash kernel.
266 extern struct resource crashk_res
;
267 extern struct resource crashk_low_res
;
268 extern note_buf_t __percpu
*crash_notes
;
270 /* flag to track if kexec reboot is in progress */
271 extern bool kexec_in_progress
;
273 int crash_shrink_memory(unsigned long new_size
);
274 size_t crash_get_memory_size(void);
275 void crash_free_reserved_phys_range(unsigned long begin
, unsigned long end
);
277 int __weak
arch_kexec_kernel_image_probe(struct kimage
*image
, void *buf
,
278 unsigned long buf_len
);
279 void * __weak
arch_kexec_kernel_image_load(struct kimage
*image
);
280 int __weak
arch_kimage_file_post_load_cleanup(struct kimage
*image
);
281 int __weak
arch_kexec_kernel_verify_sig(struct kimage
*image
, void *buf
,
282 unsigned long buf_len
);
283 int __weak
arch_kexec_apply_relocations_add(const Elf_Ehdr
*ehdr
,
284 Elf_Shdr
*sechdrs
, unsigned int relsec
);
285 int __weak
arch_kexec_apply_relocations(const Elf_Ehdr
*ehdr
, Elf_Shdr
*sechdrs
,
286 unsigned int relsec
);
287 void arch_kexec_protect_crashkres(void);
288 void arch_kexec_unprotect_crashkres(void);
290 #ifndef page_to_boot_pfn
291 static inline unsigned long page_to_boot_pfn(struct page
*page
)
293 return page_to_pfn(page
);
297 #ifndef boot_pfn_to_page
298 static inline struct page
*boot_pfn_to_page(unsigned long boot_pfn
)
300 return pfn_to_page(boot_pfn
);
304 #ifndef phys_to_boot_phys
305 static inline unsigned long phys_to_boot_phys(phys_addr_t phys
)
311 #ifndef boot_phys_to_phys
312 static inline phys_addr_t
boot_phys_to_phys(unsigned long boot_phys
)
318 static inline unsigned long virt_to_boot_phys(void *addr
)
320 return phys_to_boot_phys(__pa((unsigned long)addr
));
323 static inline void *boot_phys_to_virt(unsigned long entry
)
325 return phys_to_virt(boot_phys_to_phys(entry
));
328 #else /* !CONFIG_KEXEC_CORE */
331 static inline void __crash_kexec(struct pt_regs
*regs
) { }
332 static inline void crash_kexec(struct pt_regs
*regs
) { }
333 static inline int kexec_should_crash(struct task_struct
*p
) { return 0; }
334 static inline int kexec_crash_loaded(void) { return 0; }
335 #define kexec_in_progress false
336 #endif /* CONFIG_KEXEC_CORE */
338 #endif /* !defined(__ASSEBMLY__) */
340 #endif /* LINUX_KEXEC_H */