1 #ifndef LINUX_KEXEC_H 2 #define LINUX_KEXEC_H 3 4 #define IND_DESTINATION_BIT 0 5 #define IND_INDIRECTION_BIT 1 6 #define IND_DONE_BIT 2 7 #define IND_SOURCE_BIT 3 8 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) 14 15 #if !defined(__ASSEMBLY__) 16 17 #include <linux/crash_core.h> 18 #include <asm/io.h> 19 20 #include <uapi/linux/kexec.h> 21 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> 28 29 /* Verify architecture specific macros are defined */ 30 31 #ifndef KEXEC_SOURCE_MEMORY_LIMIT 32 #error KEXEC_SOURCE_MEMORY_LIMIT not defined 33 #endif 34 35 #ifndef KEXEC_DESTINATION_MEMORY_LIMIT 36 #error KEXEC_DESTINATION_MEMORY_LIMIT not defined 37 #endif 38 39 #ifndef KEXEC_CONTROL_MEMORY_LIMIT 40 #error KEXEC_CONTROL_MEMORY_LIMIT not defined 41 #endif 42 43 #ifndef KEXEC_CONTROL_MEMORY_GFP 44 #define KEXEC_CONTROL_MEMORY_GFP (GFP_KERNEL | __GFP_NORETRY) 45 #endif 46 47 #ifndef KEXEC_CONTROL_PAGE_SIZE 48 #error KEXEC_CONTROL_PAGE_SIZE not defined 49 #endif 50 51 #ifndef KEXEC_ARCH 52 #error KEXEC_ARCH not defined 53 #endif 54 55 #ifndef KEXEC_CRASH_CONTROL_MEMORY_LIMIT 56 #define KEXEC_CRASH_CONTROL_MEMORY_LIMIT KEXEC_CONTROL_MEMORY_LIMIT 57 #endif 58 59 #ifndef KEXEC_CRASH_MEM_ALIGN 60 #define KEXEC_CRASH_MEM_ALIGN PAGE_SIZE 61 #endif 62 63 #define KEXEC_CORE_NOTE_NAME CRASH_CORE_NOTE_NAME 64 65 /* 66 * This structure is used to hold the arguments that are used when loading 67 * kernel binaries. 68 */ 69 70 typedef unsigned long kimage_entry_t; 71 72 struct kexec_segment { 73 /* 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. 77 * 78 * Use ->buf when expecting to deal with user memory and use ->kbuf 79 * when expecting to deal with kernel memory. 80 */ 81 union { 82 void __user *buf; 83 void *kbuf; 84 }; 85 size_t bufsz; 86 unsigned long mem; 87 size_t memsz; 88 }; 89 90 #ifdef CONFIG_COMPAT 91 struct compat_kexec_segment { 92 compat_uptr_t buf; 93 compat_size_t bufsz; 94 compat_ulong_t mem; /* User space sees this as a (void *) ... */ 95 compat_size_t memsz; 96 }; 97 #endif 98 99 #ifdef CONFIG_KEXEC_FILE 100 struct purgatory_info { 101 /* Pointer to elf header of read only purgatory */ 102 Elf_Ehdr *ehdr; 103 104 /* Pointer to purgatory sechdrs which are modifiable */ 105 Elf_Shdr *sechdrs; 106 /* 107 * Temporary buffer location where purgatory is loaded and relocated 108 * This memory can be freed post image load 109 */ 110 void *purgatory_buf; 111 112 /* Address where purgatory is finally loaded and is executed from */ 113 unsigned long purgatory_load_addr; 114 }; 115 116 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); 122 123 #ifdef CONFIG_KEXEC_VERIFY_SIG 124 typedef int (kexec_verify_sig_t)(const char *kernel_buf, 125 unsigned long kernel_len); 126 #endif 127 128 struct kexec_file_ops { 129 kexec_probe_t *probe; 130 kexec_load_t *load; 131 kexec_cleanup_t *cleanup; 132 #ifdef CONFIG_KEXEC_VERIFY_SIG 133 kexec_verify_sig_t *verify_sig; 134 #endif 135 }; 136 137 /** 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. 148 */ 149 struct kexec_buf { 150 struct kimage *image; 151 void *buffer; 152 unsigned long bufsz; 153 unsigned long mem; 154 unsigned long memsz; 155 unsigned long buf_align; 156 unsigned long buf_min; 157 unsigned long buf_max; 158 bool top_down; 159 }; 160 161 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 */ 166 167 struct kimage { 168 kimage_entry_t head; 169 kimage_entry_t *entry; 170 kimage_entry_t *last_entry; 171 172 unsigned long start; 173 struct page *control_code_page; 174 struct page *swap_page; 175 void *vmcoreinfo_data_copy; /* locates in the crash memory */ 176 177 unsigned long nr_segments; 178 struct kexec_segment segment[KEXEC_SEGMENT_MAX]; 179 180 struct list_head control_pages; 181 struct list_head dest_pages; 182 struct list_head unusable_pages; 183 184 /* Address of next control page to allocate for crash kernels. */ 185 unsigned long control_page; 186 187 /* Flags to indicate special processing */ 188 unsigned int type : 1; 189 #define KEXEC_TYPE_DEFAULT 0 190 #define KEXEC_TYPE_CRASH 1 191 unsigned int preserve_context : 1; 192 /* If set, we are using file mode kexec syscall */ 193 unsigned int file_mode:1; 194 195 #ifdef ARCH_HAS_KIMAGE_ARCH 196 struct kimage_arch arch; 197 #endif 198 199 #ifdef CONFIG_KEXEC_FILE 200 /* Additional fields for file based kexec syscall */ 201 void *kernel_buf; 202 unsigned long kernel_buf_len; 203 204 void *initrd_buf; 205 unsigned long initrd_buf_len; 206 207 char *cmdline_buf; 208 unsigned long cmdline_buf_len; 209 210 /* File operations provided by image loader */ 211 struct kexec_file_ops *fops; 212 213 /* Image loader handling the kernel can store a pointer here */ 214 void *image_loader_data; 215 216 /* Information for loading purgatory */ 217 struct purgatory_info purgatory_info; 218 #endif 219 }; 220 221 /* kexec interface functions */ 222 extern void machine_kexec(struct kimage *image); 223 extern int machine_kexec_prepare(struct kimage *image); 224 extern void machine_kexec_cleanup(struct kimage *image); 225 extern asmlinkage long sys_kexec_load(unsigned long entry, 226 unsigned long nr_segments, 227 struct kexec_segment __user *segments, 228 unsigned long flags); 229 extern int kernel_kexec(void); 230 extern struct page *kimage_alloc_control_pages(struct kimage *image, 231 unsigned int order); 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, 239 const char *name); 240 extern void __crash_kexec(struct pt_regs *); 241 extern void crash_kexec(struct pt_regs *); 242 int kexec_should_crash(struct task_struct *); 243 int kexec_crash_loaded(void); 244 void crash_save_cpu(struct pt_regs *regs, int cpu); 245 extern int kimage_crash_copy_vmcoreinfo(struct kimage *image); 246 247 extern struct kimage *kexec_image; 248 extern struct kimage *kexec_crash_image; 249 extern int kexec_load_disabled; 250 251 #ifndef kexec_flush_icache_page 252 #define kexec_flush_icache_page(page) 253 #endif 254 255 /* List of defined/legal kexec flags */ 256 #ifndef CONFIG_KEXEC_JUMP 257 #define KEXEC_FLAGS KEXEC_ON_CRASH 258 #else 259 #define KEXEC_FLAGS (KEXEC_ON_CRASH | KEXEC_PRESERVE_CONTEXT) 260 #endif 261 262 /* List of defined/legal kexec file flags */ 263 #define KEXEC_FILE_FLAGS (KEXEC_FILE_UNLOAD | KEXEC_FILE_ON_CRASH | \ 264 KEXEC_FILE_NO_INITRAMFS) 265 266 /* Location of a reserved region to hold the crash kernel. 267 */ 268 extern struct resource crashk_res; 269 extern struct resource crashk_low_res; 270 extern note_buf_t __percpu *crash_notes; 271 272 /* flag to track if kexec reboot is in progress */ 273 extern bool kexec_in_progress; 274 275 int crash_shrink_memory(unsigned long new_size); 276 size_t crash_get_memory_size(void); 277 void crash_free_reserved_phys_range(unsigned long begin, unsigned long end); 278 279 int __weak arch_kexec_kernel_image_probe(struct kimage *image, void *buf, 280 unsigned long buf_len); 281 void * __weak arch_kexec_kernel_image_load(struct kimage *image); 282 int __weak arch_kimage_file_post_load_cleanup(struct kimage *image); 283 int __weak arch_kexec_kernel_verify_sig(struct kimage *image, void *buf, 284 unsigned long buf_len); 285 int __weak arch_kexec_apply_relocations_add(const Elf_Ehdr *ehdr, 286 Elf_Shdr *sechdrs, unsigned int relsec); 287 int __weak arch_kexec_apply_relocations(const Elf_Ehdr *ehdr, Elf_Shdr *sechdrs, 288 unsigned int relsec); 289 void arch_kexec_protect_crashkres(void); 290 void arch_kexec_unprotect_crashkres(void); 291 292 #ifndef page_to_boot_pfn 293 static inline unsigned long page_to_boot_pfn(struct page *page) 294 { 295 return page_to_pfn(page); 296 } 297 #endif 298 299 #ifndef boot_pfn_to_page 300 static inline struct page *boot_pfn_to_page(unsigned long boot_pfn) 301 { 302 return pfn_to_page(boot_pfn); 303 } 304 #endif 305 306 #ifndef phys_to_boot_phys 307 static inline unsigned long phys_to_boot_phys(phys_addr_t phys) 308 { 309 return phys; 310 } 311 #endif 312 313 #ifndef boot_phys_to_phys 314 static inline phys_addr_t boot_phys_to_phys(unsigned long boot_phys) 315 { 316 return boot_phys; 317 } 318 #endif 319 320 static inline unsigned long virt_to_boot_phys(void *addr) 321 { 322 return phys_to_boot_phys(__pa((unsigned long)addr)); 323 } 324 325 static inline void *boot_phys_to_virt(unsigned long entry) 326 { 327 return phys_to_virt(boot_phys_to_phys(entry)); 328 } 329 330 #else /* !CONFIG_KEXEC_CORE */ 331 struct pt_regs; 332 struct task_struct; 333 static inline void __crash_kexec(struct pt_regs *regs) { } 334 static inline void crash_kexec(struct pt_regs *regs) { } 335 static inline int kexec_should_crash(struct task_struct *p) { return 0; } 336 static inline int kexec_crash_loaded(void) { return 0; } 337 #define kexec_in_progress false 338 #endif /* CONFIG_KEXEC_CORE */ 339 340 #endif /* !defined(__ASSEBMLY__) */ 341 342 #endif /* LINUX_KEXEC_H */ 343