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)
14 #if !defined(__ASSEMBLY__)
16 #include <uapi/linux/kexec.h>
19 #include <linux/list.h>
20 #include <linux/linkage.h>
21 #include <linux/compat.h>
22 #include <linux/ioport.h>
23 #include <linux/elfcore.h>
24 #include <linux/elf.h>
25 #include <linux/module.h>
26 #include <asm/kexec.h>
28 /* Verify architecture specific macros are defined */
30 #ifndef KEXEC_SOURCE_MEMORY_LIMIT
31 #error KEXEC_SOURCE_MEMORY_LIMIT not defined
34 #ifndef KEXEC_DESTINATION_MEMORY_LIMIT
35 #error KEXEC_DESTINATION_MEMORY_LIMIT not defined
38 #ifndef KEXEC_CONTROL_MEMORY_LIMIT
39 #error KEXEC_CONTROL_MEMORY_LIMIT not defined
42 #ifndef KEXEC_CONTROL_PAGE_SIZE
43 #error KEXEC_CONTROL_PAGE_SIZE not defined
47 #error KEXEC_ARCH not defined
50 #ifndef KEXEC_CRASH_CONTROL_MEMORY_LIMIT
51 #define KEXEC_CRASH_CONTROL_MEMORY_LIMIT KEXEC_CONTROL_MEMORY_LIMIT
54 #ifndef KEXEC_CRASH_MEM_ALIGN
55 #define KEXEC_CRASH_MEM_ALIGN PAGE_SIZE
58 #define KEXEC_NOTE_HEAD_BYTES ALIGN(sizeof(struct elf_note), 4)
59 #define KEXEC_CORE_NOTE_NAME "CORE"
60 #define KEXEC_CORE_NOTE_NAME_BYTES ALIGN(sizeof(KEXEC_CORE_NOTE_NAME), 4)
61 #define KEXEC_CORE_NOTE_DESC_BYTES ALIGN(sizeof(struct elf_prstatus), 4)
63 * The per-cpu notes area is a list of notes terminated by a "NULL"
64 * note header. For kdump, the code in vmcore.c runs in the context
65 * of the second kernel to combine them into one note.
67 #ifndef KEXEC_NOTE_BYTES
68 #define KEXEC_NOTE_BYTES ( (KEXEC_NOTE_HEAD_BYTES * 2) + \
69 KEXEC_CORE_NOTE_NAME_BYTES + \
70 KEXEC_CORE_NOTE_DESC_BYTES )
74 * This structure is used to hold the arguments that are used when loading
78 typedef unsigned long kimage_entry_t;
80 struct kexec_segment {
82 * This pointer can point to user memory if kexec_load() system
83 * call is used or will point to kernel memory if
84 * kexec_file_load() system call is used.
86 * Use ->buf when expecting to deal with user memory and use ->kbuf
87 * when expecting to deal with kernel memory.
99 struct compat_kexec_segment {
102 compat_ulong_t mem; /* User space sees this as a (void *) ... */
107 struct kexec_sha_region {
112 struct purgatory_info {
113 /* Pointer to elf header of read only purgatory */
116 /* Pointer to purgatory sechdrs which are modifiable */
119 * Temporary buffer location where purgatory is loaded and relocated
120 * This memory can be freed post image load
124 /* Address where purgatory is finally loaded and is executed from */
125 unsigned long purgatory_load_addr;
130 kimage_entry_t *entry;
131 kimage_entry_t *last_entry;
134 struct page *control_code_page;
135 struct page *swap_page;
137 unsigned long nr_segments;
138 struct kexec_segment segment[KEXEC_SEGMENT_MAX];
140 struct list_head control_pages;
141 struct list_head dest_pages;
142 struct list_head unusable_pages;
144 /* Address of next control page to allocate for crash kernels. */
145 unsigned long control_page;
147 /* Flags to indicate special processing */
148 unsigned int type : 1;
149 #define KEXEC_TYPE_DEFAULT 0
150 #define KEXEC_TYPE_CRASH 1
151 unsigned int preserve_context : 1;
152 /* If set, we are using file mode kexec syscall */
153 unsigned int file_mode:1;
155 #ifdef ARCH_HAS_KIMAGE_ARCH
156 struct kimage_arch arch;
159 /* Additional fields for file based kexec syscall */
161 unsigned long kernel_buf_len;
164 unsigned long initrd_buf_len;
167 unsigned long cmdline_buf_len;
169 /* File operations provided by image loader */
170 struct kexec_file_ops *fops;
172 /* Image loader handling the kernel can store a pointer here */
173 void *image_loader_data;
175 /* Information for loading purgatory */
176 struct purgatory_info purgatory_info;
180 * Keeps track of buffer parameters as provided by caller for requesting
181 * memory placement of buffer.
184 struct kimage *image;
189 unsigned long buf_align;
190 unsigned long buf_min;
191 unsigned long buf_max;
192 bool top_down; /* allocate from top of memory hole */
195 typedef int (kexec_probe_t)(const char *kernel_buf, unsigned long kernel_size);
196 typedef void *(kexec_load_t)(struct kimage *image, char *kernel_buf,
197 unsigned long kernel_len, char *initrd,
198 unsigned long initrd_len, char *cmdline,
199 unsigned long cmdline_len);
200 typedef int (kexec_cleanup_t)(void *loader_data);
201 typedef int (kexec_verify_sig_t)(const char *kernel_buf,
202 unsigned long kernel_len);
204 struct kexec_file_ops {
205 kexec_probe_t *probe;
207 kexec_cleanup_t *cleanup;
208 kexec_verify_sig_t *verify_sig;
211 /* kexec interface functions */
212 extern void machine_kexec(struct kimage *image);
213 extern int machine_kexec_prepare(struct kimage *image);
214 extern void machine_kexec_cleanup(struct kimage *image);
215 extern asmlinkage long sys_kexec_load(unsigned long entry,
216 unsigned long nr_segments,
217 struct kexec_segment __user *segments,
218 unsigned long flags);
219 extern int kernel_kexec(void);
220 extern int kexec_add_buffer(struct kimage *image, char *buffer,
221 unsigned long bufsz, unsigned long memsz,
222 unsigned long buf_align, unsigned long buf_min,
223 unsigned long buf_max, bool top_down,
224 unsigned long *load_addr);
225 extern struct page *kimage_alloc_control_pages(struct kimage *image,
227 extern int kexec_load_purgatory(struct kimage *image, unsigned long min,
228 unsigned long max, int top_down,
229 unsigned long *load_addr);
230 extern int kexec_purgatory_get_set_symbol(struct kimage *image,
231 const char *name, void *buf,
232 unsigned int size, bool get_value);
233 extern void *kexec_purgatory_get_symbol_addr(struct kimage *image,
235 extern void crash_kexec(struct pt_regs *);
236 int kexec_should_crash(struct task_struct *);
237 void crash_save_cpu(struct pt_regs *regs, int cpu);
238 void crash_save_vmcoreinfo(void);
239 void crash_map_reserved_pages(void);
240 void crash_unmap_reserved_pages(void);
241 void arch_crash_save_vmcoreinfo(void);
243 void vmcoreinfo_append_str(const char *fmt, ...);
244 unsigned long paddr_vmcoreinfo_note(void);
246 #define VMCOREINFO_OSRELEASE(value) \
247 vmcoreinfo_append_str("OSRELEASE=%s\n", value)
248 #define VMCOREINFO_PAGESIZE(value) \
249 vmcoreinfo_append_str("PAGESIZE=%ld\n", value)
250 #define VMCOREINFO_SYMBOL(name) \
251 vmcoreinfo_append_str("SYMBOL(%s)=%lx\n", #name, (unsigned long)&name)
252 #define VMCOREINFO_SIZE(name) \
253 vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \
254 (unsigned long)sizeof(name))
255 #define VMCOREINFO_STRUCT_SIZE(name) \
256 vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \
257 (unsigned long)sizeof(struct name))
258 #define VMCOREINFO_OFFSET(name, field) \
259 vmcoreinfo_append_str("OFFSET(%s.%s)=%lu\n", #name, #field, \
260 (unsigned long)offsetof(struct name, field))
261 #define VMCOREINFO_LENGTH(name, value) \
262 vmcoreinfo_append_str("LENGTH(%s)=%lu\n", #name, (unsigned long)value)
263 #define VMCOREINFO_NUMBER(name) \
264 vmcoreinfo_append_str("NUMBER(%s)=%ld\n", #name, (long)name)
265 #define VMCOREINFO_CONFIG(name) \
266 vmcoreinfo_append_str("CONFIG_%s=y\n", #name)
268 extern struct kimage *kexec_image;
269 extern struct kimage *kexec_crash_image;
270 extern int kexec_load_disabled;
272 #ifndef kexec_flush_icache_page
273 #define kexec_flush_icache_page(page)
276 /* List of defined/legal kexec flags */
277 #ifndef CONFIG_KEXEC_JUMP
278 #define KEXEC_FLAGS KEXEC_ON_CRASH
280 #define KEXEC_FLAGS (KEXEC_ON_CRASH | KEXEC_PRESERVE_CONTEXT)
283 /* List of defined/legal kexec file flags */
284 #define KEXEC_FILE_FLAGS (KEXEC_FILE_UNLOAD | KEXEC_FILE_ON_CRASH | \
285 KEXEC_FILE_NO_INITRAMFS)
287 #define VMCOREINFO_BYTES (4096)
288 #define VMCOREINFO_NOTE_NAME "VMCOREINFO"
289 #define VMCOREINFO_NOTE_NAME_BYTES ALIGN(sizeof(VMCOREINFO_NOTE_NAME), 4)
290 #define VMCOREINFO_NOTE_SIZE (KEXEC_NOTE_HEAD_BYTES*2 + VMCOREINFO_BYTES \
291 + VMCOREINFO_NOTE_NAME_BYTES)
293 /* Location of a reserved region to hold the crash kernel.
295 extern struct resource crashk_res;
296 extern struct resource crashk_low_res;
297 typedef u32 note_buf_t[KEXEC_NOTE_BYTES/4];
298 extern note_buf_t __percpu *crash_notes;
299 extern u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4];
300 extern size_t vmcoreinfo_size;
301 extern size_t vmcoreinfo_max_size;
303 /* flag to track if kexec reboot is in progress */
304 extern bool kexec_in_progress;
306 int __init parse_crashkernel(char *cmdline, unsigned long long system_ram,
307 unsigned long long *crash_size, unsigned long long *crash_base);
308 int parse_crashkernel_high(char *cmdline, unsigned long long system_ram,
309 unsigned long long *crash_size, unsigned long long *crash_base);
310 int parse_crashkernel_low(char *cmdline, unsigned long long system_ram,
311 unsigned long long *crash_size, unsigned long long *crash_base);
312 int crash_shrink_memory(unsigned long new_size);
313 size_t crash_get_memory_size(void);
314 void crash_free_reserved_phys_range(unsigned long begin, unsigned long end);
316 #else /* !CONFIG_KEXEC */
319 static inline void crash_kexec(struct pt_regs *regs) { }
320 static inline int kexec_should_crash(struct task_struct *p) { return 0; }
321 #endif /* CONFIG_KEXEC */
323 #endif /* !defined(__ASSEBMLY__) */
325 #endif /* LINUX_KEXEC_H */