LXR linux/include/linux/kexec.h

   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
  54typedef 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
  61struct 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
  69struct 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
  77struct 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 */
 106extern NORET_TYPE void machine_kexec(struct kimage *image) ATTRIB_NORET;
 107extern int machine_kexec_prepare(struct kimage *image);
 108extern void machine_kexec_cleanup(struct kimage *image);
 109extern 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
 114extern 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
 119extern struct page *kimage_alloc_control_pages(struct kimage *image,
 120                                                unsigned int order);
 121extern void crash_kexec(struct pt_regs *);
 122int kexec_should_crash(struct task_struct *);
 123void crash_save_cpu(struct pt_regs *regs, int cpu);
 124extern struct kimage *kexec_image;
 125extern 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 */
 153extern struct resource crashk_res;
 154typedef u32 note_buf_t[KEXEC_NOTE_BYTES/4];
 155extern note_buf_t *crash_notes;
 156
 157
 158#else /* !CONFIG_KEXEC */
 159struct pt_regs;
 160struct task_struct;
 161static inline void crash_kexec(struct pt_regs *regs) { }
 162static inline int kexec_should_crash(struct task_struct *p) { return 0; }
 163#endif /* CONFIG_KEXEC */
 164#endif /* LINUX_KEXEC_H */
 165