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 <uapi/linux/kexec.h>
19 #ifdef CONFIG_KEXEC_CORE
20 #include <linux/list.h>
21 #include <linux/linkage.h>
22 #include <linux/compat.h>
23 #include <linux/ioport.h>
24 #include <linux/elfcore.h>
25 #include <linux/elf.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
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_NOTE_HEAD_BYTES ALIGN(sizeof(struct elf_note), 4)
64 #define KEXEC_CORE_NOTE_NAME "CORE"
65 #define KEXEC_CORE_NOTE_NAME_BYTES ALIGN(sizeof(KEXEC_CORE_NOTE_NAME), 4)
66 #define KEXEC_CORE_NOTE_DESC_BYTES ALIGN(sizeof(struct elf_prstatus), 4)
68 * The per-cpu notes area is a list of notes terminated by a "NULL"
69 * note header. For kdump, the code in vmcore.c runs in the context
70 * of the second kernel to combine them into one note.
72 #ifndef KEXEC_NOTE_BYTES
73 #define KEXEC_NOTE_BYTES ( (KEXEC_NOTE_HEAD_BYTES * 2) + \
74 KEXEC_CORE_NOTE_NAME_BYTES + \
75 KEXEC_CORE_NOTE_DESC_BYTES )
79 * This structure is used to hold the arguments that are used when loading
83 typedef unsigned long kimage_entry_t
;
85 struct kexec_segment
{
87 * This pointer can point to user memory if kexec_load() system
88 * call is used or will point to kernel memory if
89 * kexec_file_load() system call is used.
91 * Use ->buf when expecting to deal with user memory and use ->kbuf
92 * when expecting to deal with kernel memory.
104 struct compat_kexec_segment
{
107 compat_ulong_t mem
; /* User space sees this as a (void *) ... */
112 struct kexec_sha_region
{
117 struct purgatory_info
{
118 /* Pointer to elf header of read only purgatory */
121 /* Pointer to purgatory sechdrs which are modifiable */
124 * Temporary buffer location where purgatory is loaded and relocated
125 * This memory can be freed post image load
129 /* Address where purgatory is finally loaded and is executed from */
130 unsigned long purgatory_load_addr
;
135 kimage_entry_t
*entry
;
136 kimage_entry_t
*last_entry
;
139 struct page
*control_code_page
;
140 struct page
*swap_page
;
142 unsigned long nr_segments
;
143 struct kexec_segment segment
[KEXEC_SEGMENT_MAX
];
145 struct list_head control_pages
;
146 struct list_head dest_pages
;
147 struct list_head unusable_pages
;
149 /* Address of next control page to allocate for crash kernels. */
150 unsigned long control_page
;
152 /* Flags to indicate special processing */
153 unsigned int type
: 1;
154 #define KEXEC_TYPE_DEFAULT 0
155 #define KEXEC_TYPE_CRASH 1
156 unsigned int preserve_context
: 1;
157 /* If set, we are using file mode kexec syscall */
158 unsigned int file_mode
:1;
160 #ifdef ARCH_HAS_KIMAGE_ARCH
161 struct kimage_arch arch
;
164 /* Additional fields for file based kexec syscall */
166 unsigned long kernel_buf_len
;
169 unsigned long initrd_buf_len
;
172 unsigned long cmdline_buf_len
;
174 /* File operations provided by image loader */
175 struct kexec_file_ops
*fops
;
177 /* Image loader handling the kernel can store a pointer here */
178 void *image_loader_data
;
180 /* Information for loading purgatory */
181 struct purgatory_info purgatory_info
;
185 * Keeps track of buffer parameters as provided by caller for requesting
186 * memory placement of buffer.
189 struct kimage
*image
;
194 unsigned long buf_align
;
195 unsigned long buf_min
;
196 unsigned long buf_max
;
197 bool top_down
; /* allocate from top of memory hole */
200 typedef int (kexec_probe_t
)(const char *kernel_buf
, unsigned long kernel_size
);
201 typedef void *(kexec_load_t
)(struct kimage
*image
, char *kernel_buf
,
202 unsigned long kernel_len
, char *initrd
,
203 unsigned long initrd_len
, char *cmdline
,
204 unsigned long cmdline_len
);
205 typedef int (kexec_cleanup_t
)(void *loader_data
);
206 typedef int (kexec_verify_sig_t
)(const char *kernel_buf
,
207 unsigned long kernel_len
);
209 struct kexec_file_ops
{
210 kexec_probe_t
*probe
;
212 kexec_cleanup_t
*cleanup
;
213 kexec_verify_sig_t
*verify_sig
;
216 /* kexec interface functions */
217 extern void machine_kexec(struct kimage
*image
);
218 extern int machine_kexec_prepare(struct kimage
*image
);
219 extern void machine_kexec_cleanup(struct kimage
*image
);
220 extern asmlinkage
long sys_kexec_load(unsigned long entry
,
221 unsigned long nr_segments
,
222 struct kexec_segment __user
*segments
,
223 unsigned long flags
);
224 extern int kernel_kexec(void);
225 extern int kexec_add_buffer(struct kimage
*image
, char *buffer
,
226 unsigned long bufsz
, unsigned long memsz
,
227 unsigned long buf_align
, unsigned long buf_min
,
228 unsigned long buf_max
, bool top_down
,
229 unsigned long *load_addr
);
230 extern struct page
*kimage_alloc_control_pages(struct kimage
*image
,
232 extern int kexec_load_purgatory(struct kimage
*image
, unsigned long min
,
233 unsigned long max
, int top_down
,
234 unsigned long *load_addr
);
235 extern int kexec_purgatory_get_set_symbol(struct kimage
*image
,
236 const char *name
, void *buf
,
237 unsigned int size
, bool get_value
);
238 extern void *kexec_purgatory_get_symbol_addr(struct kimage
*image
,
240 extern void crash_kexec(struct pt_regs
*);
241 int kexec_should_crash(struct task_struct
*);
242 void crash_save_cpu(struct pt_regs
*regs
, int cpu
);
243 void crash_save_vmcoreinfo(void);
244 void crash_map_reserved_pages(void);
245 void crash_unmap_reserved_pages(void);
246 void arch_crash_save_vmcoreinfo(void);
248 void vmcoreinfo_append_str(const char *fmt
, ...);
249 unsigned long paddr_vmcoreinfo_note(void);
251 #define VMCOREINFO_OSRELEASE(value) \
252 vmcoreinfo_append_str("OSRELEASE=%s\n", value)
253 #define VMCOREINFO_PAGESIZE(value) \
254 vmcoreinfo_append_str("PAGESIZE=%ld\n", value)
255 #define VMCOREINFO_SYMBOL(name) \
256 vmcoreinfo_append_str("SYMBOL(%s)=%lx\n", #name, (unsigned long)&name)
257 #define VMCOREINFO_SIZE(name) \
258 vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \
259 (unsigned long)sizeof(name))
260 #define VMCOREINFO_STRUCT_SIZE(name) \
261 vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \
262 (unsigned long)sizeof(struct name))
263 #define VMCOREINFO_OFFSET(name, field) \
264 vmcoreinfo_append_str("OFFSET(%s.%s)=%lu\n", #name, #field, \
265 (unsigned long)offsetof(struct name, field))
266 #define VMCOREINFO_LENGTH(name, value) \
267 vmcoreinfo_append_str("LENGTH(%s)=%lu\n", #name, (unsigned long)value)
268 #define VMCOREINFO_NUMBER(name) \
269 vmcoreinfo_append_str("NUMBER(%s)=%ld\n", #name, (long)name)
270 #define VMCOREINFO_CONFIG(name) \
271 vmcoreinfo_append_str("CONFIG_%s=y\n", #name)
273 extern struct kimage
*kexec_image
;
274 extern struct kimage
*kexec_crash_image
;
275 extern int kexec_load_disabled
;
277 #ifndef kexec_flush_icache_page
278 #define kexec_flush_icache_page(page)
281 /* List of defined/legal kexec flags */
282 #ifndef CONFIG_KEXEC_JUMP
283 #define KEXEC_FLAGS KEXEC_ON_CRASH
285 #define KEXEC_FLAGS (KEXEC_ON_CRASH | KEXEC_PRESERVE_CONTEXT)
288 /* List of defined/legal kexec file flags */
289 #define KEXEC_FILE_FLAGS (KEXEC_FILE_UNLOAD | KEXEC_FILE_ON_CRASH | \
290 KEXEC_FILE_NO_INITRAMFS)
292 #define VMCOREINFO_BYTES (4096)
293 #define VMCOREINFO_NOTE_NAME "VMCOREINFO"
294 #define VMCOREINFO_NOTE_NAME_BYTES ALIGN(sizeof(VMCOREINFO_NOTE_NAME), 4)
295 #define VMCOREINFO_NOTE_SIZE (KEXEC_NOTE_HEAD_BYTES*2 + VMCOREINFO_BYTES \
296 + VMCOREINFO_NOTE_NAME_BYTES)
298 /* Location of a reserved region to hold the crash kernel.
300 extern struct resource crashk_res
;
301 extern struct resource crashk_low_res
;
302 typedef u32 note_buf_t
[KEXEC_NOTE_BYTES
/4];
303 extern note_buf_t __percpu
*crash_notes
;
304 extern u32 vmcoreinfo_note
[VMCOREINFO_NOTE_SIZE
/4];
305 extern size_t vmcoreinfo_size
;
306 extern size_t vmcoreinfo_max_size
;
308 /* flag to track if kexec reboot is in progress */
309 extern bool kexec_in_progress
;
311 int __init
parse_crashkernel(char *cmdline
, unsigned long long system_ram
,
312 unsigned long long *crash_size
, unsigned long long *crash_base
);
313 int parse_crashkernel_high(char *cmdline
, unsigned long long system_ram
,
314 unsigned long long *crash_size
, unsigned long long *crash_base
);
315 int parse_crashkernel_low(char *cmdline
, unsigned long long system_ram
,
316 unsigned long long *crash_size
, unsigned long long *crash_base
);
317 int crash_shrink_memory(unsigned long new_size
);
318 size_t crash_get_memory_size(void);
319 void crash_free_reserved_phys_range(unsigned long begin
, unsigned long end
);
321 int __weak
arch_kexec_kernel_image_probe(struct kimage
*image
, void *buf
,
322 unsigned long buf_len
);
323 void * __weak
arch_kexec_kernel_image_load(struct kimage
*image
);
324 int __weak
arch_kimage_file_post_load_cleanup(struct kimage
*image
);
325 int __weak
arch_kexec_kernel_verify_sig(struct kimage
*image
, void *buf
,
326 unsigned long buf_len
);
327 int __weak
arch_kexec_apply_relocations_add(const Elf_Ehdr
*ehdr
,
328 Elf_Shdr
*sechdrs
, unsigned int relsec
);
329 int __weak
arch_kexec_apply_relocations(const Elf_Ehdr
*ehdr
, Elf_Shdr
*sechdrs
,
330 unsigned int relsec
);
332 #else /* !CONFIG_KEXEC_CORE */
335 static inline void crash_kexec(struct pt_regs
*regs
) { }
336 static inline int kexec_should_crash(struct task_struct
*p
) { return 0; }
337 #define kexec_in_progress false
338 #endif /* CONFIG_KEXEC_CORE */
340 #endif /* !defined(__ASSEBMLY__) */
342 #endif /* LINUX_KEXEC_H */