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25 .TH KEXEC_LOAD 2 2012-07-13 "Linux" "Linux Programmer's Manual"
27 kexec_load \- load a new kernel for later execution
29 .B #include <linux/kexec.h>
31 .BI "long kexec_load(unsigned long " entry ", unsigned long " nr_segments ","
33 .BI " struct kexec_segment *" segments \
34 ", unsigned long " flags ");"
37 There is no glibc wrapper for this system call; see NOTES.
41 system call loads a new kernel that can be executed later by
46 argument is a mask whose high-order bits control the operation of the call.
47 The following values can be specified in
50 .BR KEXEC_ON_CRASH " (since Linux 2.6.13)"
51 Execute the new kernel automatically on a system crash.
52 .\" FIXME figure out how this is really used
54 .BR KEXEC_PRESERVE_CONTEXT " (since Linux 2.6.27)"
55 Preserve the system hardware and
56 software states before executing the new kernel.
57 This could be used for system suspend.
58 This flag is only available if the kernel was configured with
59 .BR CONFIG_KEXEC_JUMP ,
60 and is only effective if
66 contain the architecture of the to-be-executed kernel.
67 Specify (OR) the constant
69 to use the current architecture,
70 or one of the following architecture constants
72 .BR KEXEC_ARCH_X86_64 ,
74 .BR KEXEC_ARCH_PPC64 ,
75 .BR KEXEC_ARCH_IA_64 ,
81 .BR KEXEC_ARCH_MIPS_LE .
82 The architecture must be executable on the CPU of the system.
86 argument is the physical entry address in the kernel image.
89 argument is the number of segments pointed to by the
94 argument is an array of
96 structures which define the kernel layout:
100 struct kexec_segment {
101 void *buf; /* Buffer in user space */
102 size_t bufsz; /* Buffer length in user space */
103 void *mem; /* Physical address of kernel */
104 size_t memsz; /* Physical address length */
109 .\" FIXME elaborate on the following:
110 The kernel image defined by
112 is copied from the calling process into previously reserved memory.
117 On error, \-1 is returned and
119 is set to indicate the error.
123 Another crash kernel is already being loaded
124 or a crash kernel is already in use.
131 .\" KEXEC_SEGMENT_MAX == 16
134 The caller does not have the
140 system call first appeared in Linux 2.6.13.
142 This system call is Linux-specific.
144 Currently, there is no glibc support for
149 The required constants are in the Linux kernel source file
151 which is not currently exported to glibc.
152 .\" FIXME Andi submitted a patch for this.
153 .\" Check if it got accepted later.
154 Therefore, these constants must be defined manually.
156 This system call is only available if the kernel was configured with