xref: /linux/include/uapi/linux/kexec.h (revision ff2632d7d08edc11e8bd0629e9fcfebab25c78b4)
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  */
26 #define KEXEC_FILE_UNLOAD	0x00000001
27 #define KEXEC_FILE_ON_CRASH	0x00000002
28 #define KEXEC_FILE_NO_INITRAMFS	0x00000004
29 #define KEXEC_FILE_DEBUG	0x00000008
30 
31 /* These values match the ELF architecture values.
32  * Unless there is a good reason that should continue to be the case.
33  */
34 #define KEXEC_ARCH_DEFAULT ( 0 << 16)
35 #define KEXEC_ARCH_386     ( 3 << 16)
36 #define KEXEC_ARCH_68K     ( 4 << 16)
37 #define KEXEC_ARCH_PARISC  (15 << 16)
38 #define KEXEC_ARCH_X86_64  (62 << 16)
39 #define KEXEC_ARCH_PPC     (20 << 16)
40 #define KEXEC_ARCH_PPC64   (21 << 16)
41 #define KEXEC_ARCH_IA_64   (50 << 16)
42 #define KEXEC_ARCH_ARM     (40 << 16)
43 #define KEXEC_ARCH_S390    (22 << 16)
44 #define KEXEC_ARCH_SH      (42 << 16)
45 #define KEXEC_ARCH_MIPS_LE (10 << 16)
46 #define KEXEC_ARCH_MIPS    ( 8 << 16)
47 #define KEXEC_ARCH_AARCH64 (183 << 16)
48 #define KEXEC_ARCH_RISCV   (243 << 16)
49 #define KEXEC_ARCH_LOONGARCH	(258 << 16)
50 
51 /* The artificial cap on the number of segments passed to kexec_load. */
52 #define KEXEC_SEGMENT_MAX 16
53 
54 #ifndef __KERNEL__
55 /*
56  * This structure is used to hold the arguments that are used when
57  * loading  kernel binaries.
58  */
59 struct kexec_segment {
60 	const void *buf;
61 	__kernel_size_t bufsz;
62 	const void *mem;
63 	__kernel_size_t memsz;
64 };
65 
66 #endif /* __KERNEL__ */
67 
68 #endif /* _UAPILINUX_KEXEC_H */
69