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The flags argument is a mask whose high-order bits control the operation of the call. The following values can be specified in flags:
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.
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.