cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
Log | Files | Refs | Submodules | LICENSE | sfeed.txt

wdt_ib700.c (4228B)

      1/*
      2 * Virtual hardware watchdog.
      3 *
      4 * Copyright (C) 2009 Red Hat Inc.
      5 *
      6 * This program is free software; you can redistribute it and/or
      7 * modify it under the terms of the GNU General Public License
      8 * as published by the Free Software Foundation; either version 2
      9 * of the License, or (at your option) any later version.
     10 *
     11 * This program is distributed in the hope that it will be useful,
     12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
     13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     14 * GNU General Public License for more details.
     15 *
     16 * You should have received a copy of the GNU General Public License
     17 * along with this program; if not, see <http://www.gnu.org/licenses/>.
     18 *
     19 * By Richard W.M. Jones (rjones@redhat.com).
     20 */
     21
     22#include "qemu/osdep.h"
     23#include "qemu/module.h"
     24#include "qemu/timer.h"
     25#include "sysemu/watchdog.h"
     26#include "hw/isa/isa.h"
     27#include "migration/vmstate.h"
     28#include "qom/object.h"
     29
     30/*#define IB700_DEBUG 1*/
     31
     32#ifdef IB700_DEBUG
     33#define ib700_debug(fs,...)					\
     34    fprintf(stderr,"ib700: %s: "fs,__func__,##__VA_ARGS__)
     35#else
     36#define ib700_debug(fs,...)
     37#endif
     38
     39#define TYPE_IB700 "ib700"
     40typedef struct IB700state IB700State;
     41DECLARE_INSTANCE_CHECKER(IB700State, IB700,
     42                         TYPE_IB700)
     43
     44struct IB700state {
     45    ISADevice parent_obj;
     46
     47    QEMUTimer *timer;
     48
     49    PortioList port_list;
     50};
     51
     52/* This is the timer.  We use a global here because the watchdog
     53 * code ensures there is only one watchdog (it is located at a fixed,
     54 * unchangeable IO port, so there could only ever be one anyway).
     55 */
     56
     57/* A write to this register enables the timer. */
     58static void ib700_write_enable_reg(void *vp, uint32_t addr, uint32_t data)
     59{
     60    IB700State *s = vp;
     61    static int time_map[] = {
     62        30, 28, 26, 24, 22, 20, 18, 16,
     63        14, 12, 10,  8,  6,  4,  2,  0
     64    };
     65    int64_t timeout;
     66
     67    ib700_debug("addr = %x, data = %x\n", addr, data);
     68
     69    timeout = (int64_t) time_map[data & 0xF] * NANOSECONDS_PER_SECOND;
     70    timer_mod(s->timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + timeout);
     71}
     72
     73/* A write (of any value) to this register disables the timer. */
     74static void ib700_write_disable_reg(void *vp, uint32_t addr, uint32_t data)
     75{
     76    IB700State *s = vp;
     77
     78    ib700_debug("addr = %x, data = %x\n", addr, data);
     79
     80    timer_del(s->timer);
     81}
     82
     83/* This is called when the watchdog expires. */
     84static void ib700_timer_expired(void *vp)
     85{
     86    IB700State *s = vp;
     87
     88    ib700_debug("watchdog expired\n");
     89
     90    watchdog_perform_action();
     91    timer_del(s->timer);
     92}
     93
     94static const VMStateDescription vmstate_ib700 = {
     95    .name = "ib700_wdt",
     96    .version_id = 0,
     97    .minimum_version_id = 0,
     98    .fields = (VMStateField[]) {
     99        VMSTATE_TIMER_PTR(timer, IB700State),
    100        VMSTATE_END_OF_LIST()
    101    }
    102};
    103
    104static const MemoryRegionPortio wdt_portio_list[] = {
    105    { 0x441, 2, 1, .write = ib700_write_disable_reg, },
    106    { 0x443, 2, 1, .write = ib700_write_enable_reg, },
    107    PORTIO_END_OF_LIST(),
    108};
    109
    110static void wdt_ib700_realize(DeviceState *dev, Error **errp)
    111{
    112    IB700State *s = IB700(dev);
    113
    114    ib700_debug("watchdog init\n");
    115
    116    s->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, ib700_timer_expired, s);
    117
    118    portio_list_init(&s->port_list, OBJECT(s), wdt_portio_list, s, "ib700");
    119    portio_list_add(&s->port_list, isa_address_space_io(&s->parent_obj), 0);
    120}
    121
    122static void wdt_ib700_reset(DeviceState *dev)
    123{
    124    IB700State *s = IB700(dev);
    125
    126    ib700_debug("watchdog reset\n");
    127
    128    timer_del(s->timer);
    129}
    130
    131static WatchdogTimerModel model = {
    132    .wdt_name = "ib700",
    133    .wdt_description = "iBASE 700",
    134};
    135
    136static void wdt_ib700_class_init(ObjectClass *klass, void *data)
    137{
    138    DeviceClass *dc = DEVICE_CLASS(klass);
    139
    140    dc->realize = wdt_ib700_realize;
    141    dc->reset = wdt_ib700_reset;
    142    dc->vmsd = &vmstate_ib700;
    143    set_bit(DEVICE_CATEGORY_MISC, dc->categories);
    144}
    145
    146static const TypeInfo wdt_ib700_info = {
    147    .name          = TYPE_IB700,
    148    .parent        = TYPE_ISA_DEVICE,
    149    .instance_size = sizeof(IB700State),
    150    .class_init    = wdt_ib700_class_init,
    151};
    152
    153static void wdt_ib700_register_types(void)
    154{
    155    watchdog_add_model(&model);
    156    type_register_static(&wdt_ib700_info);
    157}
    158
    159type_init(wdt_ib700_register_types)