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 <asm/kexec.h> 10 11 /* Verify architecture specific macros are defined */ 12 13 #ifndef KEXEC_SOURCE_MEMORY_LIMIT 14 #error KEXEC_SOURCE_MEMORY_LIMIT not defined 15 #endif 16 17 #ifndef KEXEC_DESTINATION_MEMORY_LIMIT 18 #error KEXEC_DESTINATION_MEMORY_LIMIT not defined 19 #endif 20 21 #ifndef KEXEC_CONTROL_MEMORY_LIMIT 22 #error KEXEC_CONTROL_MEMORY_LIMIT not defined 23 #endif 24 25 #ifndef KEXEC_CONTROL_CODE_SIZE 26 #error KEXEC_CONTROL_CODE_SIZE not defined 27 #endif 28 29 #ifndef KEXEC_ARCH 30 #error KEXEC_ARCH not defined 31 #endif 32 33 /* 34 * This structure is used to hold the arguments that are used when loading 35 * kernel binaries. 36 */ 37 38 typedef unsigned long kimage_entry_t; 39 #define IND_DESTINATION 0x1 40 #define IND_INDIRECTION 0x2 41 #define IND_DONE 0x4 42 #define IND_SOURCE 0x8 43 44 #define KEXEC_SEGMENT_MAX 16 45 struct kexec_segment { 46 void __user *buf; 47 size_t bufsz; 48 unsigned long mem; /* User space sees this as a (void *) ... */ 49 size_t memsz; 50 }; 51 52 #ifdef CONFIG_COMPAT 53 struct compat_kexec_segment { 54 compat_uptr_t buf; 55 compat_size_t bufsz; 56 compat_ulong_t mem; /* User space sees this as a (void *) ... */ 57 compat_size_t memsz; 58 }; 59 #endif 60 61 struct kimage { 62 kimage_entry_t head; 63 kimage_entry_t *entry; 64 kimage_entry_t *last_entry; 65 66 unsigned long destination; 67 68 unsigned long start; 69 struct page *control_code_page; 70 71 unsigned long nr_segments; 72 struct kexec_segment segment[KEXEC_SEGMENT_MAX]; 73 74 struct list_head control_pages; 75 struct list_head dest_pages; 76 struct list_head unuseable_pages; 77 78 /* Address of next control page to allocate for crash kernels. */ 79 unsigned long control_page; 80 81 /* Flags to indicate special processing */ 82 unsigned int type : 1; 83 #define KEXEC_TYPE_DEFAULT 0 84 #define KEXEC_TYPE_CRASH 1 85 }; 86 87 88 89 /* kexec interface functions */ 90 extern NORET_TYPE void machine_kexec(struct kimage *image) ATTRIB_NORET; 91 extern int machine_kexec_prepare(struct kimage *image); 92 extern void machine_kexec_cleanup(struct kimage *image); 93 extern asmlinkage long sys_kexec_load(unsigned long entry, 94 unsigned long nr_segments, 95 struct kexec_segment __user *segments, 96 unsigned long flags); 97 #ifdef CONFIG_COMPAT 98 extern asmlinkage long compat_sys_kexec_load(unsigned long entry, 99 unsigned long nr_segments, 100 struct compat_kexec_segment __user *segments, 101 unsigned long flags); 102 #endif 103 extern struct page *kimage_alloc_control_pages(struct kimage *image, 104 unsigned int order); 105 extern void crash_kexec(struct pt_regs *); 106 int kexec_should_crash(struct task_struct *); 107 extern struct kimage *kexec_image; 108 109 #define KEXEC_ON_CRASH 0x00000001 110 #define KEXEC_ARCH_MASK 0xffff0000 111 112 /* These values match the ELF architecture values. 113 * Unless there is a good reason that should continue to be the case. 114 */ 115 #define KEXEC_ARCH_DEFAULT ( 0 << 16) 116 #define KEXEC_ARCH_386 ( 3 << 16) 117 #define KEXEC_ARCH_X86_64 (62 << 16) 118 #define KEXEC_ARCH_PPC (20 << 16) 119 #define KEXEC_ARCH_PPC64 (21 << 16) 120 #define KEXEC_ARCH_IA_64 (50 << 16) 121 #define KEXEC_ARCH_S390 (22 << 16) 122 123 #define KEXEC_FLAGS (KEXEC_ON_CRASH) /* List of defined/legal kexec flags */ 124 125 /* Location of a reserved region to hold the crash kernel. 126 */ 127 extern struct resource crashk_res; 128 typedef u32 note_buf_t[MAX_NOTE_BYTES/4]; 129 extern note_buf_t *crash_notes; 130 131 #else /* !CONFIG_KEXEC */ 132 struct pt_regs; 133 struct task_struct; 134 static inline void crash_kexec(struct pt_regs *regs) { } 135 static inline int kexec_should_crash(struct task_struct *p) { return 0; } 136 #endif /* CONFIG_KEXEC */ 137 #endif /* LINUX_KEXEC_H */ 138