kexec.h

 1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
 2#ifndef _UAPILINUX_KEXEC_H
 3#define _UAPILINUX_KEXEC_H
 4
 5/* kexec system call -  It loads the new kernel to boot into.
 6 * kexec does not sync, or unmount filesystems so if you need
 7 * that to happen you need to do that yourself.
 8 */
 9
10#include <linux/types.h>
11
12/* kexec flags for different usage scenarios */
13#define KEXEC_ON_CRASH		0x00000001
14#define KEXEC_PRESERVE_CONTEXT	0x00000002
15#define KEXEC_UPDATE_ELFCOREHDR	0x00000004
16#define KEXEC_CRASH_HOTPLUG_SUPPORT 0x00000008
17#define KEXEC_ARCH_MASK		0xffff0000
18
19/*
20 * Kexec file load interface flags.
21 * KEXEC_FILE_UNLOAD : Unload already loaded kexec/kdump image.
22 * KEXEC_FILE_ON_CRASH : Load/unload operation belongs to kdump image.
23 * KEXEC_FILE_NO_INITRAMFS : No initramfs is being loaded. Ignore the initrd
24 *                           fd field.
25 * KEXEC_FILE_FORCE_DTB : Force carrying over the current boot's DTB to the new
26 *                        kernel on x86. This is already the default behavior on
27 *                        some other architectures, like ARM64 and PowerPC.
28 */
29#define KEXEC_FILE_UNLOAD	0x00000001
30#define KEXEC_FILE_ON_CRASH	0x00000002
31#define KEXEC_FILE_NO_INITRAMFS	0x00000004
32#define KEXEC_FILE_DEBUG	0x00000008
33#define KEXEC_FILE_NO_CMA	0x00000010
34#define KEXEC_FILE_FORCE_DTB	0x00000020
35
36/* These values match the ELF architecture values.
37 * Unless there is a good reason that should continue to be the case.
38 */
39#define KEXEC_ARCH_DEFAULT ( 0 << 16)
40#define KEXEC_ARCH_386     ( 3 << 16)
41#define KEXEC_ARCH_68K     ( 4 << 16)
42#define KEXEC_ARCH_PARISC  (15 << 16)
43#define KEXEC_ARCH_X86_64  (62 << 16)
44#define KEXEC_ARCH_PPC     (20 << 16)
45#define KEXEC_ARCH_PPC64   (21 << 16)
46#define KEXEC_ARCH_IA_64   (50 << 16)
47#define KEXEC_ARCH_ARM     (40 << 16)
48#define KEXEC_ARCH_S390    (22 << 16)
49#define KEXEC_ARCH_SH      (42 << 16)
50#define KEXEC_ARCH_MIPS_LE (10 << 16)
51#define KEXEC_ARCH_MIPS    ( 8 << 16)
52#define KEXEC_ARCH_AARCH64 (183 << 16)
53#define KEXEC_ARCH_RISCV   (243 << 16)
54#define KEXEC_ARCH_LOONGARCH	(258 << 16)
55
56/* The artificial cap on the number of segments passed to kexec_load. */
57#define KEXEC_SEGMENT_MAX 16
58
59#ifndef __KERNEL__
60/*
61 * This structure is used to hold the arguments that are used when
62 * loading  kernel binaries.
63 */
64struct kexec_segment {
65	const void *buf;
66	__kernel_size_t bufsz;
67	const void *mem;
68	__kernel_size_t memsz;
69};
70
71#endif /* __KERNEL__ */
72
73#endif /* _UAPILINUX_KEXEC_H */