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reboot_amd64.go
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reboot_amd64.go
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package gokrazy
import (
"io/ioutil"
"log"
"os"
"path/filepath"
"syscall"
"github.com/gokrazy/internal/rootdev"
"golang.org/x/sys/unix"
)
func kexecReboot() error {
tmpdir, err := ioutil.TempDir("", "kexec")
if err != nil {
return err
}
if err := syscall.Mount(rootdev.Partition(rootdev.Boot), tmpdir, "vfat", 0, ""); err != nil {
return err
}
kernel, err := os.Open(filepath.Join(tmpdir, "vmlinuz"))
if err != nil {
return err
}
defer kernel.Close()
cmdline, err := ioutil.ReadFile(filepath.Join(tmpdir, "cmdline.txt"))
if err != nil {
return err
}
flags := unix.KEXEC_ARCH_DEFAULT | unix.KEXEC_FILE_NO_INITRAMFS
if err := unix.KexecFileLoad(int(kernel.Fd()), 0, string(cmdline), flags); err != nil {
// err is syscall.ENOSYS on kernels without CONFIG_KEXEC_FILE_LOAD=y
return err
}
return unix.Reboot(unix.LINUX_REBOOT_CMD_KEXEC)
}
func reboot(tryKexec bool) error {
if tryKexec {
if err := kexecReboot(); err != nil {
log.Printf("kexec reboot failed: %v", err)
}
}
return unix.Reboot(unix.LINUX_REBOOT_CMD_RESTART)
}