113 lines
3.0 KiB
C
113 lines
3.0 KiB
C
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/*
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* Virtual hardware watchdog.
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*
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* Copyright (C) 2009 Red Hat Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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* USA.
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*
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* By Richard W.M. Jones (rjones@redhat.com).
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*/
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#include "qemu-common.h"
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#include "qemu-timer.h"
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#include "watchdog.h"
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#include "hw.h"
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#include "isa.h"
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#include "pc.h"
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/*#define IB700_DEBUG 1*/
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#ifdef IB700_DEBUG
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#define ib700_debug(fs,...) \
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fprintf(stderr,"ib700: %s: "fs,__func__,##__VA_ARGS__)
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#else
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#define ib700_debug(fs,...)
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#endif
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/* This is the timer. We use a global here because the watchdog
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* code ensures there is only one watchdog (it is located at a fixed,
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* unchangable IO port, so there could only ever be one anyway).
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*/
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static QEMUTimer *timer = NULL;
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/* A write to this register enables the timer. */
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static void ib700_write_enable_reg(void *vp, uint32_t addr, uint32_t data)
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{
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static int time_map[] = {
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30, 28, 26, 24, 22, 20, 18, 16,
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14, 12, 10, 8, 6, 4, 2, 0
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};
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int64 timeout;
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ib700_debug("addr = %x, data = %x\n", addr, data);
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timeout = (int64_t) time_map[data & 0xF] * ticks_per_sec;
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qemu_mod_timer(timer, qemu_get_clock (vm_clock) + timeout);
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}
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/* A write (of any value) to this register disables the timer. */
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static void ib700_write_disable_reg(void *vp, uint32_t addr, uint32_t data)
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{
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ib700_debug("addr = %x, data = %x\n", addr, data);
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qemu_del_timer(timer);
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}
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/* This is called when the watchdog expires. */
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static void ib700_timer_expired(void *vp)
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{
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ib700_debug("watchdog expired\n");
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watchdog_perform_action();
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qemu_del_timer(timer);
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}
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static void ib700_save(QEMUFile *f, void *vp)
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{
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qemu_put_timer(f, timer);
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}
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static int ib700_load(QEMUFile *f, void *vp, int version)
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{
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if (version != 0)
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return -EINVAL;
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qemu_get_timer(f, timer);
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return 0;
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}
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/* Create and initialize a virtual IB700 during PC creation. */
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static void ib700_pc_init(PCIBus *unused)
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{
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register_savevm("ib700_wdt", -1, 0, ib700_save, ib700_load, NULL);
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register_ioport_write(0x441, 2, 1, ib700_write_disable_reg, NULL);
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register_ioport_write(0x443, 2, 1, ib700_write_enable_reg, NULL);
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}
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static WatchdogTimerModel model = {
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.wdt_name = "ib700",
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.wdt_description = "iBASE 700",
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.wdt_pc_init = ib700_pc_init,
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};
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void wdt_ib700_init(void)
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{
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watchdog_add_model(&model);
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timer = qemu_new_timer(vm_clock, ib700_timer_expired, NULL);
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}
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