mx_system_mexec - Soft reboot the system with a new kernel and bootimage
#include <magenta/syscalls.h>
mx_status_t mx_system_mexec(mx_handle_t kernel_vmo,
mx_handle_t bootimage_vmo);
mx_system_mexec() accepts two vmo handles: kernel_vmo should contain a kernel image and bootimage_vmo should contain an initrd whose address shall be passed to the new kernel as a kernel argument.
Upon success, mx_system_mexec shall supplant the currently running kernel image with the kernel image contained within kernel_vmo, load the ramdisk contained within bootimage_vmo to a location in physical memory and branch directly into the new kernel while providing the address of the loaded initrd to the new kernel.
mx_system_mexec() shall not return upon success.
This syscall should be very privileged.