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 <asm/kexec.h> 11 12 /* Verify architecture specific macros are defined */ 13 14 #ifndef KEXEC_SOURCE_MEMORY_LIMIT 15 #error KEXEC_SOURCE_MEMORY_LIMIT not defined 16 #endif 17 18 #ifndef KEXEC_DESTINATION_MEMORY_LIMIT 19 #error KEXEC_DESTINATION_MEMORY_LIMIT not defined 20 #endif 21 22 #ifndef KEXEC_CONTROL_MEMORY_LIMIT 23 #error KEXEC_CONTROL_MEMORY_LIMIT not defined 24 #endif 25 26 #ifndef KEXEC_CONTROL_CODE_SIZE 27 #error KEXEC_CONTROL_CODE_SIZE not defined 28 #endif 29 30 #ifndef KEXEC_ARCH 31 #error KEXEC_ARCH not defined 32 #endif 33 34 /* 35 * This structure is used to hold the arguments that are used when loading 36 * kernel binaries. 37 */ 38 39 typedef unsigned long kimage_entry_t; 40 #define IND_DESTINATION 0x1 41 #define IND_INDIRECTION 0x2 42 #define IND_DONE 0x4 43 #define IND_SOURCE 0x8 44 45 #define KEXEC_SEGMENT_MAX 16 46 struct kexec_segment { 47 void __user *buf; 48 size_t bufsz; 49 unsigned long mem; /* User space sees this as a (void *) ... */ 50 size_t memsz; 51 }; 52 53 #ifdef CONFIG_COMPAT 54 struct compat_kexec_segment { 55 compat_uptr_t buf; 56 compat_size_t bufsz; 57 compat_ulong_t mem; /* User space sees this as a (void *) ... */ 58 compat_size_t memsz; 59 }; 60 #endif 61 62 struct kimage { 63 kimage_entry_t head; 64 kimage_entry_t *entry; 65 kimage_entry_t *last_entry; 66 67 unsigned long destination; 68 69 unsigned long start; 70 struct page *control_code_page; 71 72 unsigned long nr_segments; 73 struct kexec_segment segment[KEXEC_SEGMENT_MAX]; 74 75 struct list_head control_pages; 76 struct list_head dest_pages; 77 struct list_head unuseable_pages; 78 79 /* Address of next control page to allocate for crash kernels. */ 80 unsigned long control_page; 81 82 /* Flags to indicate special processing */ 83 unsigned int type : 1; 84 #define KEXEC_TYPE_DEFAULT 0 85 #define KEXEC_TYPE_CRASH 1 86 }; 87 88 89 90 /* kexec interface functions */ 91 extern NORET_TYPE void machine_kexec(struct kimage *image) ATTRIB_NORET; 92 extern int machine_kexec_prepare(struct kimage *image); 93 extern void machine_kexec_cleanup(struct kimage *image); 94 extern asmlinkage long sys_kexec_load(unsigned long entry, 95 unsigned long nr_segments, 96 struct kexec_segment __user *segments, 97 unsigned long flags); 98 #ifdef CONFIG_COMPAT 99 extern asmlinkage long compat_sys_kexec_load(unsigned long entry, 100 unsigned long nr_segments, 101 struct compat_kexec_segment __user *segments, 102 unsigned long flags); 103 #endif 104 extern struct page *kimage_alloc_control_pages(struct kimage *image, 105 unsigned int order); 106 extern void crash_kexec(struct pt_regs *); 107 int kexec_should_crash(struct task_struct *); 108 extern struct kimage *kexec_image; 109 extern struct kimage *kexec_crash_image; 110 111 #define KEXEC_ON_CRASH 0x00000001 112 #define KEXEC_ARCH_MASK 0xffff0000 113 114 /* These values match the ELF architecture values. 115 * Unless there is a good reason that should continue to be the case. 116 */ 117 #define KEXEC_ARCH_DEFAULT ( 0 << 16) 118 #define KEXEC_ARCH_386 ( 3 << 16) 119 #define KEXEC_ARCH_X86_64 (62 << 16) 120 #define KEXEC_ARCH_PPC (20 << 16) 121 #define KEXEC_ARCH_PPC64 (21 << 16) 122 #define KEXEC_ARCH_IA_64 (50 << 16) 123 #define KEXEC_ARCH_S390 (22 << 16) 124 #define KEXEC_ARCH_SH (42 << 16) 125 126 #define KEXEC_FLAGS (KEXEC_ON_CRASH) /* List of defined/legal kexec flags */ 127 128 /* Location of a reserved region to hold the crash kernel. 129 */ 130 extern struct resource crashk_res; 131 typedef u32 note_buf_t[MAX_NOTE_BYTES/4]; 132 extern note_buf_t *crash_notes; 133 134 #else /* !CONFIG_KEXEC */ 135 struct pt_regs; 136 struct task_struct; 137 static inline void crash_kexec(struct pt_regs *regs) { } 138 static inline int kexec_should_crash(struct task_struct *p) { return 0; } 139 #endif /* CONFIG_KEXEC */ 140 #endif /* LINUX_KEXEC_H */ 141
