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 * 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.
70 #ifndef KEXEC_NOTE_BYTES
71 #define KEXEC_NOTE_BYTES CRASH_CORE_NOTE_BYTES
75 * This structure is used to hold the arguments that are used when loading
79 typedef unsigned long kimage_entry_t
;
81 struct kexec_segment
{
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.
87 * Use ->buf when expecting to deal with user memory and use ->kbuf
88 * when expecting to deal with kernel memory.
100 struct compat_kexec_segment
{
103 compat_ulong_t mem
; /* User space sees this as a (void *) ... */
108 #ifdef CONFIG_KEXEC_FILE
109 struct purgatory_info
{
110 /* Pointer to elf header of read only purgatory */
113 /* Pointer to purgatory sechdrs which are modifiable */
116 * Temporary buffer location where purgatory is loaded and relocated
117 * This memory can be freed post image load
121 /* Address where purgatory is finally loaded and is executed from */
122 unsigned long purgatory_load_addr
;
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
);
132 #ifdef CONFIG_KEXEC_VERIFY_SIG
133 typedef int (kexec_verify_sig_t
)(const char *kernel_buf
,
134 unsigned long kernel_len
);
137 struct kexec_file_ops
{
138 kexec_probe_t
*probe
;
140 kexec_cleanup_t
*cleanup
;
141 #ifdef CONFIG_KEXEC_VERIFY_SIG
142 kexec_verify_sig_t
*verify_sig
;
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.
159 struct kimage
*image
;
164 unsigned long buf_align
;
165 unsigned long buf_min
;
166 unsigned long buf_max
;
170 int __weak
arch_kexec_walk_mem(struct kexec_buf
*kbuf
,
171 int (*func
)(u64
, u64
, void *));
172 extern int kexec_add_buffer(struct kexec_buf
*kbuf
);
173 int kexec_locate_mem_hole(struct kexec_buf
*kbuf
);
174 #endif /* CONFIG_KEXEC_FILE */
178 kimage_entry_t
*entry
;
179 kimage_entry_t
*last_entry
;
182 struct page
*control_code_page
;
183 struct page
*swap_page
;
185 unsigned long nr_segments
;
186 struct kexec_segment segment
[KEXEC_SEGMENT_MAX
];
188 struct list_head control_pages
;
189 struct list_head dest_pages
;
190 struct list_head unusable_pages
;
192 /* Address of next control page to allocate for crash kernels. */
193 unsigned long control_page
;
195 /* Flags to indicate special processing */
196 unsigned int type
: 1;
197 #define KEXEC_TYPE_DEFAULT 0
198 #define KEXEC_TYPE_CRASH 1
199 unsigned int preserve_context
: 1;
200 /* If set, we are using file mode kexec syscall */
201 unsigned int file_mode
:1;
203 #ifdef ARCH_HAS_KIMAGE_ARCH
204 struct kimage_arch arch
;
207 #ifdef CONFIG_KEXEC_FILE
208 /* Additional fields for file based kexec syscall */
210 unsigned long kernel_buf_len
;
213 unsigned long initrd_buf_len
;
216 unsigned long cmdline_buf_len
;
218 /* File operations provided by image loader */
219 struct kexec_file_ops
*fops
;
221 /* Image loader handling the kernel can store a pointer here */
222 void *image_loader_data
;
224 /* Information for loading purgatory */
225 struct purgatory_info purgatory_info
;
229 /* kexec interface functions */
230 extern void machine_kexec(struct kimage
*image
);
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
,
234 unsigned long nr_segments
,
235 struct kexec_segment __user
*segments
,
236 unsigned long flags
);
237 extern int kernel_kexec(void);
238 extern struct page
*kimage_alloc_control_pages(struct kimage
*image
,
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
,
248 extern void __crash_kexec(struct pt_regs
*);
249 extern void crash_kexec(struct pt_regs
*);
250 int kexec_should_crash(struct task_struct
*);
251 int kexec_crash_loaded(void);
252 void crash_save_cpu(struct pt_regs
*regs
, int cpu
);
254 extern struct kimage
*kexec_image
;
255 extern struct kimage
*kexec_crash_image
;
256 extern int kexec_load_disabled
;
258 #ifndef kexec_flush_icache_page
259 #define kexec_flush_icache_page(page)
262 /* List of defined/legal kexec flags */
263 #ifndef CONFIG_KEXEC_JUMP
264 #define KEXEC_FLAGS KEXEC_ON_CRASH
266 #define KEXEC_FLAGS (KEXEC_ON_CRASH | KEXEC_PRESERVE_CONTEXT)
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)
273 /* Location of a reserved region to hold the crash kernel.
275 extern struct resource crashk_res
;
276 extern struct resource crashk_low_res
;
277 extern note_buf_t __percpu
*crash_notes
;
279 /* flag to track if kexec reboot is in progress */
280 extern bool kexec_in_progress
;
282 int crash_shrink_memory(unsigned long new_size
);
283 size_t crash_get_memory_size(void);
284 void crash_free_reserved_phys_range(unsigned long begin
, unsigned long end
);
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
);
296 void arch_kexec_protect_crashkres(void);
297 void arch_kexec_unprotect_crashkres(void);
299 #ifndef page_to_boot_pfn
300 static inline unsigned long page_to_boot_pfn(struct page
*page
)
302 return page_to_pfn(page
);
306 #ifndef boot_pfn_to_page
307 static inline struct page
*boot_pfn_to_page(unsigned long boot_pfn
)
309 return pfn_to_page(boot_pfn
);
313 #ifndef phys_to_boot_phys
314 static inline unsigned long phys_to_boot_phys(phys_addr_t phys
)
320 #ifndef boot_phys_to_phys
321 static inline phys_addr_t
boot_phys_to_phys(unsigned long boot_phys
)
327 static inline unsigned long virt_to_boot_phys(void *addr
)
329 return phys_to_boot_phys(__pa((unsigned long)addr
));
332 static inline void *boot_phys_to_virt(unsigned long entry
)
334 return phys_to_virt(boot_phys_to_phys(entry
));
337 #else /* !CONFIG_KEXEC_CORE */
340 static inline void __crash_kexec(struct pt_regs
*regs
) { }
341 static inline void crash_kexec(struct pt_regs
*regs
) { }
342 static inline int kexec_should_crash(struct task_struct
*p
) { return 0; }
343 static inline int kexec_crash_loaded(void) { return 0; }
344 #define kexec_in_progress false
345 #endif /* CONFIG_KEXEC_CORE */
347 #endif /* !defined(__ASSEBMLY__) */
349 #endif /* LINUX_KEXEC_H */