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/*
* Copyright (c) 2025 Ian Marco Moffett and L5 engineers
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/reboot.h>
#include <sys/cdefs.h>
#include <os/reboot.h>
#include <machine/pio.h>
/*
* Actual reboot core
*/
__dead static void
__reboot(void)
{
void *dmmy_null = NULL;
/*
* Try to be gentle and simply put the CPU into a
* reboot cycle through the i8042 reset line, though
* some chipsets may not like this.
*/
outb(0x64, 0xFE);
/*
* If somehow nothing we've tried worked, be very
* violent and force it to reboot via faulty IDT.
*/
__ASMV(
"lidt %0\n"
"int $0\n"
:
: "m" (dmmy_null)
: "memory"
);
__builtin_unreachable();
}
void
reboot(int method)
{
__reboot();
__builtin_unreachable();
}
/*
* ARG0: Method
*/
scret_t
sys_reboot(struct syscall_args *scargs)
{
int method = SCARG(scargs, int, 0);
reboot(method);
__builtin_unreachable();
}
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