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26 .TH KEXEC_LOAD 2 2012-07-13 "Linux" "Linux Programmer's Manual"
28 kexec_load \- load a new kernel for later execution
30 .B #include <linux/kexec.h>
32 .BI "long kexec_load(unsigned long " entry ", unsigned long " nr_segments ","
34 .BI " struct kexec_segment *" segments \
35 ", unsigned long " flags ");"
38 There is no glibc wrapper for this system call; see NOTES.
42 system call loads a new kernel that can be executed later by
47 argument is a mask whose high-order bits control the operation of the call.
48 The following values can be specified in
51 .BR KEXEC_ON_CRASH " (since Linux 2.6.13)"
52 Execute the new kernel automatically on a system crash.
53 .\" FIXME figure out how this is really used
55 .BR KEXEC_PRESERVE_CONTEXT " (since Linux 2.6.27)"
56 Preserve the system hardware and
57 software states before executing the new kernel.
58 This could be used for system suspend.
59 This flag is available only if the kernel was configured with
60 .BR CONFIG_KEXEC_JUMP ,
61 and is effective only if
67 contain the architecture of the to-be-executed kernel.
68 Specify (OR) the constant
70 to use the current architecture,
71 or one of the following architecture constants
73 .BR KEXEC_ARCH_X86_64 ,
75 .BR KEXEC_ARCH_PPC64 ,
76 .BR KEXEC_ARCH_IA_64 ,
82 .BR KEXEC_ARCH_MIPS_LE .
83 The architecture must be executable on the CPU of the system.
87 argument is the physical entry address in the kernel image.
90 argument is the number of segments pointed to by the
95 argument is an array of
97 structures which define the kernel layout:
101 struct kexec_segment {
102 void *buf; /* Buffer in user space */
103 size_t bufsz; /* Buffer length in user space */
104 void *mem; /* Physical address of kernel */
105 size_t memsz; /* Physical address length */
110 .\" FIXME elaborate on the following:
111 The kernel image defined by
113 is copied from the calling process into previously reserved memory.
118 On error, \-1 is returned and
120 is set to indicate the error.
124 Another crash kernel is already being loaded
125 or a crash kernel is already in use.
132 .\" KEXEC_SEGMENT_MAX == 16
135 The caller does not have the
141 system call first appeared in Linux 2.6.13.
143 This system call is Linux-specific.
145 Currently, there is no glibc support for
150 The required constants are in the Linux kernel source file
152 which is not currently exported to glibc.
153 .\" FIXME Andi submitted a patch for this.
154 .\" Check if it got accepted later.
155 Therefore, these constants must be defined manually.
157 This system call is available only if the kernel was configured with
163 This page is part of release 3.67 of the Linux
166 A description of the project,
167 information about reporting bugs,
168 and the latest version of this page,
170 \%http://www.kernel.org/doc/man\-pages/.