1 #ifndef LINUX_KEXEC_H 2 #define LINUX_KEXEC_H 3 4 #ifdef CONFIG_KEXEC 5 #include <linux/types.h> 6 #include <linux/list.h> 7 #include <linux/linkage.h> 8 #include <linux/compat.h> 9 #include <linux/ioport.h> 10 #include <linux/elfcore.h> 11 #include <linux/elf.h> 12 #include <asm/kexec.h> 13 14 /* Verify architecture specific macros are defined */ 15 16 #ifndef KEXEC_SOURCE_MEMORY_LIMIT 17 #error KEXEC_SOURCE_MEMORY_LIMIT not defined 18 #endif 19 20 #ifndef KEXEC_DESTINATION_MEMORY_LIMIT 21 #error KEXEC_DESTINATION_MEMORY_LIMIT not defined 22 #endif 23 24 #ifndef KEXEC_CONTROL_MEMORY_LIMIT 25 #error KEXEC_CONTROL_MEMORY_LIMIT not defined 26 #endif 27 28 #ifndef KEXEC_CONTROL_PAGE_SIZE 29 #error KEXEC_CONTROL_PAGE_SIZE not defined 30 #endif 31 32 #ifndef KEXEC_ARCH 33 #error KEXEC_ARCH not defined 34 #endif 35 36 #ifndef KEXEC_CRASH_CONTROL_MEMORY_LIMIT 37 #define KEXEC_CRASH_CONTROL_MEMORY_LIMIT KEXEC_CONTROL_MEMORY_LIMIT 38 #endif 39 40 #ifndef KEXEC_CRASH_MEM_ALIGN 41 #define KEXEC_CRASH_MEM_ALIGN PAGE_SIZE 42 #endif 43 44 #define KEXEC_NOTE_HEAD_BYTES ALIGN(sizeof(struct elf_note), 4) 45 #define KEXEC_CORE_NOTE_NAME "CORE" 46 #define KEXEC_CORE_NOTE_NAME_BYTES ALIGN(sizeof(KEXEC_CORE_NOTE_NAME), 4) 47 #define KEXEC_CORE_NOTE_DESC_BYTES ALIGN(sizeof(struct elf_prstatus), 4) 48 /* 49 * The per-cpu notes area is a list of notes terminated by a "NULL" 50 * note header. For kdump, the code in vmcore.c runs in the context 51 * of the second kernel to combine them into one note. 52 */ 53 #define KEXEC_NOTE_BYTES ( (KEXEC_NOTE_HEAD_BYTES * 2) + \ 54 KEXEC_CORE_NOTE_NAME_BYTES + \ 55 KEXEC_CORE_NOTE_DESC_BYTES ) 56 57 /* 58 * This structure is used to hold the arguments that are used when loading 59 * kernel binaries. 60 */ 61 62 typedef unsigned long kimage_entry_t; 63 #define IND_DESTINATION 0x1 64 #define IND_INDIRECTION 0x2 65 #define IND_DONE 0x4 66 #define IND_SOURCE 0x8 67 68 #define KEXEC_SEGMENT_MAX 16 69 struct kexec_segment { 70 void __user *buf; 71 size_t bufsz; 72 unsigned long mem; /* User space sees this as a (void *) ... */ 73 size_t memsz; 74 }; 75 76 #ifdef CONFIG_COMPAT 77 struct compat_kexec_segment { 78 compat_uptr_t buf; 79 compat_size_t bufsz; 80 compat_ulong_t mem; /* User space sees this as a (void *) ... */ 81 compat_size_t memsz; 82 }; 83 #endif 84 85 struct kimage { 86 kimage_entry_t head; 87 kimage_entry_t *entry; 88 kimage_entry_t *last_entry; 89 90 unsigned long destination; 91 92 unsigned long start; 93 struct page *control_code_page; 94 struct page *swap_page; 95 96 unsigned long nr_segments; 97 struct kexec_segment segment[KEXEC_SEGMENT_MAX]; 98 99 struct list_head control_pages; 100 struct list_head dest_pages; 101 struct list_head unuseable_pages; 102 103 /* Address of next control page to allocate for crash kernels. */ 104 unsigned long control_page; 105 106 /* Flags to indicate special processing */ 107 unsigned int type : 1; 108 #define KEXEC_TYPE_DEFAULT 0 109 #define KEXEC_TYPE_CRASH 1 110 unsigned int preserve_context : 1; 111 112 #ifdef ARCH_HAS_KIMAGE_ARCH 113 struct kimage_arch arch; 114 #endif 115 }; 116 117 118 119 /* kexec interface functions */ 120 extern void machine_kexec(struct kimage *image); 121 extern int machine_kexec_prepare(struct kimage *image); 122 extern void machine_kexec_cleanup(struct kimage *image); 123 extern asmlinkage long sys_kexec_load(unsigned long entry, 124 unsigned long nr_segments, 125 struct kexec_segment __user *segments, 126 unsigned long flags); 127 extern int kernel_kexec(void); 128 #ifdef CONFIG_COMPAT 129 extern asmlinkage long compat_sys_kexec_load(unsigned long entry, 130 unsigned long nr_segments, 131 struct compat_kexec_segment __user *segments, 132 unsigned long flags); 133 #endif 134 extern struct page *kimage_alloc_control_pages(struct kimage *image, 135 unsigned int order); 136 extern void crash_kexec(struct pt_regs *); 137 int kexec_should_crash(struct task_struct *); 138 void crash_save_cpu(struct pt_regs *regs, int cpu); 139 void crash_save_vmcoreinfo(void); 140 void crash_map_reserved_pages(void); 141 void crash_unmap_reserved_pages(void); 142 void arch_crash_save_vmcoreinfo(void); 143 __printf(1, 2) 144 void vmcoreinfo_append_str(const char *fmt, ...); 145 unsigned long paddr_vmcoreinfo_note(void); 146 147 #define VMCOREINFO_OSRELEASE(value) \ 148 vmcoreinfo_append_str("OSRELEASE=%s\n", value) 149 #define VMCOREINFO_PAGESIZE(value) \ 150 vmcoreinfo_append_str("PAGESIZE=%ld\n", value) 151 #define VMCOREINFO_SYMBOL(name) \ 152 vmcoreinfo_append_str("SYMBOL(%s)=%lx\n", #name, (unsigned long)&name) 153 #define VMCOREINFO_SIZE(name) \ 154 vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \ 155 (unsigned long)sizeof(name)) 156 #define VMCOREINFO_STRUCT_SIZE(name) \ 157 vmcoreinfo_append_str("SIZE(%s)=%lu\n", #name, \ 158 (unsigned long)sizeof(struct name)) 159 #define VMCOREINFO_OFFSET(name, field) \ 160 vmcoreinfo_append_str("OFFSET(%s.%s)=%lu\n", #name, #field, \ 161 (unsigned long)offsetof(struct name, field)) 162 #define VMCOREINFO_LENGTH(name, value) \ 163 vmcoreinfo_append_str("LENGTH(%s)=%lu\n", #name, (unsigned long)value) 164 #define VMCOREINFO_NUMBER(name) \ 165 vmcoreinfo_append_str("NUMBER(%s)=%ld\n", #name, (long)name) 166 #define VMCOREINFO_CONFIG(name) \ 167 vmcoreinfo_append_str("CONFIG_%s=y\n", #name) 168 169 extern struct kimage *kexec_image; 170 extern struct kimage *kexec_crash_image; 171 172 #ifndef kexec_flush_icache_page 173 #define kexec_flush_icache_page(page) 174 #endif 175 176 #define KEXEC_ON_CRASH 0x00000001 177 #define KEXEC_PRESERVE_CONTEXT 0x00000002 178 #define KEXEC_ARCH_MASK 0xffff0000 179 180 /* These values match the ELF architecture values. 181 * Unless there is a good reason that should continue to be the case. 182 */ 183 #define KEXEC_ARCH_DEFAULT ( 0 << 16) 184 #define KEXEC_ARCH_386 ( 3 << 16) 185 #define KEXEC_ARCH_X86_64 (62 << 16) 186 #define KEXEC_ARCH_PPC (20 << 16) 187 #define KEXEC_ARCH_PPC64 (21 << 16) 188 #define KEXEC_ARCH_IA_64 (50 << 16) 189 #define KEXEC_ARCH_ARM (40 << 16) 190 #define KEXEC_ARCH_S390 (22 << 16) 191 #define KEXEC_ARCH_SH (42 << 16) 192 #define KEXEC_ARCH_MIPS_LE (10 << 16) 193 #define KEXEC_ARCH_MIPS ( 8 << 16) 194 195 /* List of defined/legal kexec flags */ 196 #ifndef CONFIG_KEXEC_JUMP 197 #define KEXEC_FLAGS KEXEC_ON_CRASH 198 #else 199 #define KEXEC_FLAGS (KEXEC_ON_CRASH | KEXEC_PRESERVE_CONTEXT) 200 #endif 201 202 #define VMCOREINFO_BYTES (4096) 203 #define VMCOREINFO_NOTE_NAME "VMCOREINFO" 204 #define VMCOREINFO_NOTE_NAME_BYTES ALIGN(sizeof(VMCOREINFO_NOTE_NAME), 4) 205 #define VMCOREINFO_NOTE_SIZE (KEXEC_NOTE_HEAD_BYTES*2 + VMCOREINFO_BYTES \ 206 + VMCOREINFO_NOTE_NAME_BYTES) 207 208 /* Location of a reserved region to hold the crash kernel. 209 */ 210 extern struct resource crashk_res; 211 typedef u32 note_buf_t[KEXEC_NOTE_BYTES/4]; 212 extern note_buf_t __percpu *crash_notes; 213 extern u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4]; 214 extern size_t vmcoreinfo_size; 215 extern size_t vmcoreinfo_max_size; 216 217 int __init parse_crashkernel(char *cmdline, unsigned long long system_ram, 218 unsigned long long *crash_size, unsigned long long *crash_base); 219 int crash_shrink_memory(unsigned long new_size); 220 size_t crash_get_memory_size(void); 221 void crash_free_reserved_phys_range(unsigned long begin, unsigned long end); 222 223 #else /* !CONFIG_KEXEC */ 224 struct pt_regs; 225 struct task_struct; 226 static inline void crash_kexec(struct pt_regs *regs) { } 227 static inline int kexec_should_crash(struct task_struct *p) { return 0; } 228 #endif /* CONFIG_KEXEC */ 229 #endif /* LINUX_KEXEC_H */ 230