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124 lines
2.9 KiB
C
124 lines
2.9 KiB
C
/*
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* Copyright (C) 2014 René Kijewski <rene.kijewski@fu-berlin.de>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @ingroup x86
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* @{
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*
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* @file
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* @brief Configurable reboot handler for x86.
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*
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* @author René Kijewski <rene.kijewski@fu-berlin.de>
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*
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* @}
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*/
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#include "x86_interrupts.h"
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#include "x86_ports.h"
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#include "x86_reboot.h"
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#define KBC_DATA (0x60)
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#define KBC_STATUS (0x64)
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#define KBC_COMMAND (0x64)
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#define KBC_OUTPUT_FULL (1u << 0)
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#define KBC_INPUT_FULL (1u << 1)
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#define KBC_RESET ((uint8_t) ~(1u << 0))
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static const struct idtr_t EMPTY_IDT = {
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.limit = 0,
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.base = NULL,
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};
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void x86_load_empty_idt(void)
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{
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asm volatile ("lidt %0" :: "m"(EMPTY_IDT));
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}
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static bool fail_violently;
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void NORETURN x86_kbc_reboot(void)
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{
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/* First load an empty IDT. Any interrupt will cause a tripple fault. */
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x86_load_empty_idt();
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while (1) {
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if (fail_violently) {
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asm volatile ("int3"); /* Cause a tripple fault. Won't return. */
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}
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fail_violently = true;
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for (unsigned i = 0; i < 0x100; ++i) {
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for (unsigned j = 0; j < 0x10000; ++j) {
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uint8_t c = inb(KBC_STATUS);
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if (c & KBC_OUTPUT_FULL) {
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(void) inb(KBC_DATA);
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}
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else if (!(c & KBC_OUTPUT_FULL)) {
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outb(KBC_COMMAND, KBC_RESET);
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break;
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}
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}
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}
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asm volatile ("int3"); /* Cause a tripple fault. Won't return. */
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}
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}
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static x86_reboot_t reboot_fun;
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static bool reboot_twice;
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int reboot_arch(int mode)
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{
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switch (mode) {
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case RB_AUTOBOOT:
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asm volatile ("cli");
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if (!reboot_twice) {
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reboot_twice = true;
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if (reboot_fun) {
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reboot_fun();
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}
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}
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x86_kbc_reboot();
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default:
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return -1;
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}
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}
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void x86_set_reboot_fun(x86_reboot_t fun)
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{
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reboot_fun = fun;
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}
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static x86_shutdown_t shutdown_fun;
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bool x86_shutdown(void)
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{
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if (!shutdown_fun) {
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return false;
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}
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return shutdown_fun();
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}
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void x86_set_shutdown_fun(x86_shutdown_t fun)
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{
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shutdown_fun = fun;
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}
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