The
cpu_reboot() function handles final system shutdown, and either halts or reboots the system. The exact action to be taken is determined by the flags passed in
howto and by whether or not the system has finished autoconfiguration.
If the system has finished autoconfiguration,
cpu_reboot() does the following:
1.
Sets the
boothowto system variable (see
boothowto(9)) from the
howto argument.
2.
If this is the first invocation of
cpu_reboot() and the
RB_NOSYNC flag is not set in
howto, syncs and unmounts the system disks by calling
vfs_shutdown(9) and sets the time of day clock by calling
resettodr(9).
4.
If rebooting after a crash (i.e., if RB_DUMP is set in howto, but RB_HALT is not), saves a system crash dump.
6.
Prints a message indicating that the system is about to be halted or rebooted.
7.
If RB_HALT is set in howto, halts the system. Otherwise, reboots the system.
If the system has not finished autoconfiguration,
cpu_reboot() runs any shutdown hooks by calling
pmf_system_shutdown(9), prints a message, and halts the system.
If
RB_STRING is set in
howto, then the parameter
bootstr is passed to the system boot loader on some ports.