c330dda908
Create two files in /sys/kernel, kexec_loaded and kexec_crash_loaded. Each file contains a simple boolean value indicating whether the relevant kernel has been loaded into memory. The motivation for this is geared around support. Signed-off-by: Jeff Moyer <jmoyer@redhat.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
140 lines
3.6 KiB
C
140 lines
3.6 KiB
C
#ifndef LINUX_KEXEC_H
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#define LINUX_KEXEC_H
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#ifdef CONFIG_KEXEC
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#include <linux/types.h>
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#include <linux/list.h>
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#include <linux/linkage.h>
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#include <linux/compat.h>
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#include <linux/ioport.h>
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#include <asm/kexec.h>
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/* Verify architecture specific macros are defined */
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#ifndef KEXEC_SOURCE_MEMORY_LIMIT
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#error KEXEC_SOURCE_MEMORY_LIMIT not defined
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#endif
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#ifndef KEXEC_DESTINATION_MEMORY_LIMIT
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#error KEXEC_DESTINATION_MEMORY_LIMIT not defined
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#endif
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#ifndef KEXEC_CONTROL_MEMORY_LIMIT
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#error KEXEC_CONTROL_MEMORY_LIMIT not defined
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#endif
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#ifndef KEXEC_CONTROL_CODE_SIZE
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#error KEXEC_CONTROL_CODE_SIZE not defined
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#endif
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#ifndef KEXEC_ARCH
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#error KEXEC_ARCH not defined
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#endif
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/*
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* This structure is used to hold the arguments that are used when loading
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* kernel binaries.
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*/
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typedef unsigned long kimage_entry_t;
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#define IND_DESTINATION 0x1
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#define IND_INDIRECTION 0x2
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#define IND_DONE 0x4
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#define IND_SOURCE 0x8
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#define KEXEC_SEGMENT_MAX 16
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struct kexec_segment {
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void __user *buf;
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size_t bufsz;
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unsigned long mem; /* User space sees this as a (void *) ... */
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size_t memsz;
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};
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#ifdef CONFIG_COMPAT
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struct compat_kexec_segment {
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compat_uptr_t buf;
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compat_size_t bufsz;
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compat_ulong_t mem; /* User space sees this as a (void *) ... */
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compat_size_t memsz;
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};
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#endif
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struct kimage {
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kimage_entry_t head;
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kimage_entry_t *entry;
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kimage_entry_t *last_entry;
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unsigned long destination;
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unsigned long start;
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struct page *control_code_page;
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unsigned long nr_segments;
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struct kexec_segment segment[KEXEC_SEGMENT_MAX];
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struct list_head control_pages;
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struct list_head dest_pages;
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struct list_head unuseable_pages;
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/* Address of next control page to allocate for crash kernels. */
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unsigned long control_page;
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/* Flags to indicate special processing */
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unsigned int type : 1;
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#define KEXEC_TYPE_DEFAULT 0
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#define KEXEC_TYPE_CRASH 1
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};
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/* kexec interface functions */
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extern NORET_TYPE void machine_kexec(struct kimage *image) ATTRIB_NORET;
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extern int machine_kexec_prepare(struct kimage *image);
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extern void machine_kexec_cleanup(struct kimage *image);
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extern asmlinkage long sys_kexec_load(unsigned long entry,
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unsigned long nr_segments,
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struct kexec_segment __user *segments,
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unsigned long flags);
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#ifdef CONFIG_COMPAT
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extern asmlinkage long compat_sys_kexec_load(unsigned long entry,
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unsigned long nr_segments,
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struct compat_kexec_segment __user *segments,
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unsigned long flags);
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#endif
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extern struct page *kimage_alloc_control_pages(struct kimage *image,
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unsigned int order);
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extern void crash_kexec(struct pt_regs *);
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int kexec_should_crash(struct task_struct *);
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extern struct kimage *kexec_image;
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extern struct kimage *kexec_crash_image;
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#define KEXEC_ON_CRASH 0x00000001
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#define KEXEC_ARCH_MASK 0xffff0000
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/* These values match the ELF architecture values.
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* Unless there is a good reason that should continue to be the case.
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*/
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#define KEXEC_ARCH_DEFAULT ( 0 << 16)
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#define KEXEC_ARCH_386 ( 3 << 16)
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#define KEXEC_ARCH_X86_64 (62 << 16)
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#define KEXEC_ARCH_PPC (20 << 16)
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#define KEXEC_ARCH_PPC64 (21 << 16)
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#define KEXEC_ARCH_IA_64 (50 << 16)
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#define KEXEC_ARCH_S390 (22 << 16)
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#define KEXEC_ARCH_SH (42 << 16)
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#define KEXEC_FLAGS (KEXEC_ON_CRASH) /* List of defined/legal kexec flags */
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/* Location of a reserved region to hold the crash kernel.
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*/
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extern struct resource crashk_res;
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typedef u32 note_buf_t[MAX_NOTE_BYTES/4];
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extern note_buf_t *crash_notes;
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#else /* !CONFIG_KEXEC */
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struct pt_regs;
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struct task_struct;
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static inline void crash_kexec(struct pt_regs *regs) { }
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static inline int kexec_should_crash(struct task_struct *p) { return 0; }
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#endif /* CONFIG_KEXEC */
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#endif /* LINUX_KEXEC_H */
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