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 extern struct kimage *kexec_image; 125 extern struct kimage *kexec_crash_image; 126 127 #ifndef kexec_flush_icache_page 128 #define kexec_flush_icache_page(page) 129 #endif 130 131 #define KEXEC_ON_CRASH 0x00000001 132 #define KEXEC_ARCH_MASK 0xffff0000 133 134 /* These values match the ELF architecture values. 135 * Unless there is a good reason that should continue to be the case. 136 */ 137 #define KEXEC_ARCH_DEFAULT ( 0 << 16) 138 #define KEXEC_ARCH_386 ( 3 << 16) 139 #define KEXEC_ARCH_X86_64 (62 << 16) 140 #define KEXEC_ARCH_PPC (20 << 16) 141 #define KEXEC_ARCH_PPC64 (21 << 16) 142 #define KEXEC_ARCH_IA_64 (50 << 16) 143 #define KEXEC_ARCH_ARM (40 << 16) 144 #define KEXEC_ARCH_S390 (22 << 16) 145 #define KEXEC_ARCH_SH (42 << 16) 146 #define KEXEC_ARCH_MIPS_LE (10 << 16) 147 #define KEXEC_ARCH_MIPS ( 8 << 16) 148 149 #define KEXEC_FLAGS (KEXEC_ON_CRASH) /* List of defined/legal kexec flags */ 150 151 /* Location of a reserved region to hold the crash kernel. 152 */ 153 extern struct resource crashk_res; 154 typedef u32 note_buf_t[KEXEC_NOTE_BYTES/4]; 155 extern note_buf_t *crash_notes; 156 157 158 #else /* !CONFIG_KEXEC */ 159 struct pt_regs; 160 struct task_struct; 161 static inline void crash_kexec(struct pt_regs *regs) { } 162 static inline int kexec_should_crash(struct task_struct *p) { return 0; } 163 #endif /* CONFIG_KEXEC */ 164 #endif /* LINUX_KEXEC_H */ 165