1 /* SPDX-License-Identifier: GPL-2.0 */
5 #define IND_DESTINATION_BIT 0
6 #define IND_INDIRECTION_BIT 1
8 #define IND_SOURCE_BIT 3
10 #define IND_DESTINATION (1 << IND_DESTINATION_BIT)
11 #define IND_INDIRECTION (1 << IND_INDIRECTION_BIT)
12 #define IND_DONE (1 << IND_DONE_BIT)
13 #define IND_SOURCE (1 << IND_SOURCE_BIT)
14 #define IND_FLAGS (IND_DESTINATION | IND_INDIRECTION | IND_DONE | IND_SOURCE)
16 #if !defined(__ASSEMBLY__)
18 #include <linux/crash_core.h>
21 #include <uapi/linux/kexec.h>
23 #ifdef CONFIG_KEXEC_CORE
24 #include <linux/list.h>
25 #include <linux/compat.h>
26 #include <linux/ioport.h>
27 #include <linux/module.h>
28 #include <asm/kexec.h>
30 /* Verify architecture specific macros are defined */
32 #ifndef KEXEC_SOURCE_MEMORY_LIMIT
33 #error KEXEC_SOURCE_MEMORY_LIMIT not defined
36 #ifndef KEXEC_DESTINATION_MEMORY_LIMIT
37 #error KEXEC_DESTINATION_MEMORY_LIMIT not defined
40 #ifndef KEXEC_CONTROL_MEMORY_LIMIT
41 #error KEXEC_CONTROL_MEMORY_LIMIT not defined
44 #ifndef KEXEC_CONTROL_MEMORY_GFP
45 #define KEXEC_CONTROL_MEMORY_GFP (GFP_KERNEL | __GFP_NORETRY)
48 #ifndef KEXEC_CONTROL_PAGE_SIZE
49 #error KEXEC_CONTROL_PAGE_SIZE not defined
53 #error KEXEC_ARCH not defined
56 #ifndef KEXEC_CRASH_CONTROL_MEMORY_LIMIT
57 #define KEXEC_CRASH_CONTROL_MEMORY_LIMIT KEXEC_CONTROL_MEMORY_LIMIT
60 #ifndef KEXEC_CRASH_MEM_ALIGN
61 #define KEXEC_CRASH_MEM_ALIGN PAGE_SIZE
64 #define KEXEC_CORE_NOTE_NAME CRASH_CORE_NOTE_NAME
67 * This structure is used to hold the arguments that are used when loading
71 typedef unsigned long kimage_entry_t;
73 struct kexec_segment {
75 * This pointer can point to user memory if kexec_load() system
76 * call is used or will point to kernel memory if
77 * kexec_file_load() system call is used.
79 * Use ->buf when expecting to deal with user memory and use ->kbuf
80 * when expecting to deal with kernel memory.
92 struct compat_kexec_segment {
95 compat_ulong_t mem; /* User space sees this as a (void *) ... */
100 #ifdef CONFIG_KEXEC_FILE
101 struct purgatory_info {
103 * Pointer to elf header at the beginning of kexec_purgatory.
104 * Note: kexec_purgatory is read only
106 const Elf_Ehdr *ehdr;
108 * Temporary, modifiable buffer for sechdrs used for relocation.
109 * This memory can be freed post image load.
113 * Temporary, modifiable buffer for stripped purgatory used for
114 * relocation. This memory can be freed post image load.
118 /* Address where purgatory is finally loaded and is executed from */
119 unsigned long purgatory_load_addr;
124 typedef int (kexec_probe_t)(const char *kernel_buf, unsigned long kernel_size);
125 typedef void *(kexec_load_t)(struct kimage *image, char *kernel_buf,
126 unsigned long kernel_len, char *initrd,
127 unsigned long initrd_len, char *cmdline,
128 unsigned long cmdline_len);
129 typedef int (kexec_cleanup_t)(void *loader_data);
131 #ifdef CONFIG_KEXEC_VERIFY_SIG
132 typedef int (kexec_verify_sig_t)(const char *kernel_buf,
133 unsigned long kernel_len);
136 struct kexec_file_ops {
137 kexec_probe_t *probe;
139 kexec_cleanup_t *cleanup;
140 #ifdef CONFIG_KEXEC_VERIFY_SIG
141 kexec_verify_sig_t *verify_sig;
145 extern const struct kexec_file_ops * const kexec_file_loaders[];
147 int kexec_image_probe_default(struct kimage *image, void *buf,
148 unsigned long buf_len);
151 * struct kexec_buf - parameters for finding a place for a buffer in memory
152 * @image: kexec image in which memory to search.
153 * @buffer: Contents which will be copied to the allocated memory.
154 * @bufsz: Size of @buffer.
155 * @mem: On return will have address of the buffer in memory.
156 * @memsz: Size for the buffer in memory.
157 * @buf_align: Minimum alignment needed.
158 * @buf_min: The buffer can't be placed below this address.
159 * @buf_max: The buffer can't be placed above this address.
160 * @top_down: Allocate from top of memory.
163 struct kimage *image;
168 unsigned long buf_align;
169 unsigned long buf_min;
170 unsigned long buf_max;
174 int __weak arch_kexec_walk_mem(struct kexec_buf *kbuf,
175 int (*func)(struct resource *, void *));
176 extern int kexec_add_buffer(struct kexec_buf *kbuf);
177 int kexec_locate_mem_hole(struct kexec_buf *kbuf);
179 /* Alignment required for elf header segment */
180 #define ELF_CORE_HEADER_ALIGN 4096
182 struct crash_mem_range {
187 unsigned int max_nr_ranges;
188 unsigned int nr_ranges;
189 struct crash_mem_range ranges[0];
192 extern int crash_exclude_mem_range(struct crash_mem *mem,
193 unsigned long long mstart,
194 unsigned long long mend);
195 extern int crash_prepare_elf64_headers(struct crash_mem *mem, int kernel_map,
196 void **addr, unsigned long *sz);
197 #endif /* CONFIG_KEXEC_FILE */
201 kimage_entry_t *entry;
202 kimage_entry_t *last_entry;
205 struct page *control_code_page;
206 struct page *swap_page;
207 void *vmcoreinfo_data_copy; /* locates in the crash memory */
209 unsigned long nr_segments;
210 struct kexec_segment segment[KEXEC_SEGMENT_MAX];
212 struct list_head control_pages;
213 struct list_head dest_pages;
214 struct list_head unusable_pages;
216 /* Address of next control page to allocate for crash kernels. */
217 unsigned long control_page;
219 /* Flags to indicate special processing */
220 unsigned int type : 1;
221 #define KEXEC_TYPE_DEFAULT 0
222 #define KEXEC_TYPE_CRASH 1
223 unsigned int preserve_context : 1;
224 /* If set, we are using file mode kexec syscall */
225 unsigned int file_mode:1;
227 #ifdef ARCH_HAS_KIMAGE_ARCH
228 struct kimage_arch arch;
231 #ifdef CONFIG_KEXEC_FILE
232 /* Additional fields for file based kexec syscall */
234 unsigned long kernel_buf_len;
237 unsigned long initrd_buf_len;
240 unsigned long cmdline_buf_len;
242 /* File operations provided by image loader */
243 const struct kexec_file_ops *fops;
245 /* Image loader handling the kernel can store a pointer here */
246 void *image_loader_data;
248 /* Information for loading purgatory */
249 struct purgatory_info purgatory_info;
253 /* kexec interface functions */
254 extern void machine_kexec(struct kimage *image);
255 extern int machine_kexec_prepare(struct kimage *image);
256 extern void machine_kexec_cleanup(struct kimage *image);
257 extern int kernel_kexec(void);
258 extern struct page *kimage_alloc_control_pages(struct kimage *image,
260 extern int kexec_load_purgatory(struct kimage *image, unsigned long min,
261 unsigned long max, int top_down,
262 unsigned long *load_addr);
263 extern int kexec_purgatory_get_set_symbol(struct kimage *image,
264 const char *name, void *buf,
265 unsigned int size, bool get_value);
266 extern void *kexec_purgatory_get_symbol_addr(struct kimage *image,
268 extern void __crash_kexec(struct pt_regs *);
269 extern void crash_kexec(struct pt_regs *);
270 int kexec_should_crash(struct task_struct *);
271 int kexec_crash_loaded(void);
272 void crash_save_cpu(struct pt_regs *regs, int cpu);
273 extern int kimage_crash_copy_vmcoreinfo(struct kimage *image);
275 extern struct kimage *kexec_image;
276 extern struct kimage *kexec_crash_image;
277 extern int kexec_load_disabled;
279 #ifndef kexec_flush_icache_page
280 #define kexec_flush_icache_page(page)
283 /* List of defined/legal kexec flags */
284 #ifndef CONFIG_KEXEC_JUMP
285 #define KEXEC_FLAGS KEXEC_ON_CRASH
287 #define KEXEC_FLAGS (KEXEC_ON_CRASH | KEXEC_PRESERVE_CONTEXT)
290 /* List of defined/legal kexec file flags */
291 #define KEXEC_FILE_FLAGS (KEXEC_FILE_UNLOAD | KEXEC_FILE_ON_CRASH | \
292 KEXEC_FILE_NO_INITRAMFS)
294 /* Location of a reserved region to hold the crash kernel.
296 extern struct resource crashk_res;
297 extern struct resource crashk_low_res;
298 extern note_buf_t __percpu *crash_notes;
300 /* flag to track if kexec reboot is in progress */
301 extern bool kexec_in_progress;
303 int crash_shrink_memory(unsigned long new_size);
304 size_t crash_get_memory_size(void);
305 void crash_free_reserved_phys_range(unsigned long begin, unsigned long end);
307 int __weak arch_kexec_apply_relocations_add(const Elf_Ehdr *ehdr,
308 Elf_Shdr *sechdrs, unsigned int relsec);
309 int __weak arch_kexec_apply_relocations(const Elf_Ehdr *ehdr, Elf_Shdr *sechdrs,
310 unsigned int relsec);
311 void arch_kexec_protect_crashkres(void);
312 void arch_kexec_unprotect_crashkres(void);
314 #ifndef page_to_boot_pfn
315 static inline unsigned long page_to_boot_pfn(struct page *page)
317 return page_to_pfn(page);
321 #ifndef boot_pfn_to_page
322 static inline struct page *boot_pfn_to_page(unsigned long boot_pfn)
324 return pfn_to_page(boot_pfn);
328 #ifndef phys_to_boot_phys
329 static inline unsigned long phys_to_boot_phys(phys_addr_t phys)
335 #ifndef boot_phys_to_phys
336 static inline phys_addr_t boot_phys_to_phys(unsigned long boot_phys)
342 static inline unsigned long virt_to_boot_phys(void *addr)
344 return phys_to_boot_phys(__pa((unsigned long)addr));
347 static inline void *boot_phys_to_virt(unsigned long entry)
349 return phys_to_virt(boot_phys_to_phys(entry));
352 #ifndef arch_kexec_post_alloc_pages
353 static inline int arch_kexec_post_alloc_pages(void *vaddr, unsigned int pages, gfp_t gfp) { return 0; }
356 #ifndef arch_kexec_pre_free_pages
357 static inline void arch_kexec_pre_free_pages(void *vaddr, unsigned int pages) { }
360 #else /* !CONFIG_KEXEC_CORE */
363 static inline void __crash_kexec(struct pt_regs *regs) { }
364 static inline void crash_kexec(struct pt_regs *regs) { }
365 static inline int kexec_should_crash(struct task_struct *p) { return 0; }
366 static inline int kexec_crash_loaded(void) { return 0; }
367 #define kexec_in_progress false
368 #endif /* CONFIG_KEXEC_CORE */
370 #endif /* !defined(__ASSEBMLY__) */
372 #endif /* LINUX_KEXEC_H */