kexec_load — load a new kernel for later execution
#include <linux/kexec.h>
long
kexec_load( |
unsigned long entry, |
| unsigned long nr_segments, | |
| struct kexec_segment *segments, | |
unsigned long flags); |
The kexec_load() system call
loads a new kernel that can be executed later by reboot(2).
The flags argument
is a mask whose high-order bits control the operation of the
call. The following values can be specified in flags:
KEXEC_ON_CRASH (since Linux
2.6.13)Execute the new kernel automatically on a system crash.
KEXEC_PRESERVE_CONTEXT (since Linux
2.7.27)Preserve the system hardware and software states
before executing the new kernel. This could be used for
system suspend. This flag is only available if the
kernel was configured with CONFIG_KEXEC_JUMP, and is only
effective if nr_segments is greater
than 0.
The low-order bits of flags contain the architecture
of the to-be-executed kernel. Specify (OR) the constant
KEXEC_ARCH_DEFAULT to use the
current architecture, or one of the following architecture
constants KEXEC_ARCH_386,
KEXEC_ARCH_X86_64, KEXEC_ARCH_PPC, KEXEC_ARCH_PPC64, KEXEC_ARCH_IA_64, KEXEC_ARCH_ARM, KEXEC_ARCH_S390, KEXEC_ARCH_SH, KEXEC_ARCH_MIPS, and KEXEC_ARCH_MIPS_LE. The architecture must
be executable on the CPU of the system.
The entry argument
is the physical entry address in the kernel image. The
nr_segments argument
is the number of segments pointed to by the segments pointer. The
segments argument is
an array of kexec_segment
structures which define the kernel layout:
struct kexec_segment { void * buf;size_t bufsz;void * mem;size_t memsz;};
The kernel image defined by segments is copied from the
calling process into previously reserved memory.
On success, kexec_load()
returns 0. On error, −1 is returned and errno is set to indicate the error.
Another crash kernel is already being loaded or a crash kernel is already in use.
flags is
invalid; or nr_segments is too
large
The caller does not have the CAP_SYS_BOOT capability.
Currently, there is no glibc support for kexec_load(). Call it using syscall(2).
The required constants are in the kernel source file
linux/kexec.h, which is not
currently exported to glibc. Therefore, these constants must
be defined manually.
This system call is only available if the kernel was
configured with CONFIG_KEXEC.
This page is part of release 3.33 of the Linux man-pages project. A
description of the project, and information about reporting
bugs, can be found at http://man7.org/linux/man-pages/.
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Copyright (C) 2010 Intel Corporation Author: Andi Kleen Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies. Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim copying, provided that the entire resulting derived work is distributed under the terms of a permission notice identical to this one. Since the Linux kernel and libraries are constantly changing, this manual page may be incorrect or out-of-date. The author(s) assume no responsibility for errors or omissions, or for damages resulting from the use of the information contained herein. The author(s) may not have taken the same level of care in the production of this manual, which is licensed free of charge, as they might when working professionally. Formatted or processed versions of this manual, if unaccompanied by the source, must acknowledge the copyright and authors of this work. |