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NAME

       kexec_load - load a new kernel for later execution

SYNOPSIS

       #include <linux/kexec.h>
       long kexec_load(unsigned long entry, unsigned long nr_segments,
                       struct kexec_segment *segments, unsigned long flags);

DESCRIPTION

       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;        /* Buffer in user space */
               size_t  bufsz;      /* Buffer length in user space */
               void   *mem;        /* Physical address of kernel */
               size_t  memsz;      /* Physical address length */
           };

       The kernel image defined by segments is copied from the calling process
       into previously reserved memory.

RETURN VALUE

       On success, kexec_load() returns 0.  On error, -1 is returned and errno
       is set to indicate the error.

ERRORS

       EBUSY  Another crash kernel is already being loaded or a  crash  kernel
              is already in use.

       EINVAL flags is invalid; or nr_segments is too large

       EPERM  The caller does not have the CAP_SYS_BOOT capability.

VERSIONS

       The kexec_load() system call first appeared in Linux 2.6.13.

CONFORMING TO

       This system call is Linux-specific.

NOTES

       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.

SEE ALSO

       reboot(2), syscall(2)

COLOPHON

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       description of the project, and information about reporting  bugs,  can
       be found at http://man7.org/linux/man-pages/.