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