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

gpio_key.c (2888B)

      1/*
      2 * GPIO key
      3 *
      4 * Copyright (c) 2016 Linaro Limited
      5 *
      6 * Author: Shannon Zhao <shannon.zhao@linaro.org>
      7 *
      8 * Emulate a (human) keypress -- when the key is triggered by
      9 * setting the incoming gpio line, the outbound irq line is
     10 * raised for 100ms before being dropped again.
     11 *
     12 * This program is free software; you can redistribute it and/or modify
     13 * it under the terms of the GNU General Public License; either version 2
     14 * of the License, or (at your option) any later version.
     15 *
     16 * This program is distributed in the hope that it will be useful,
     17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
     18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     19 * GNU General Public License for more details.
     20 *
     21 * You should have received a copy of the GNU General Public License along
     22 * with this program; if not, see <http://www.gnu.org/licenses/>.
     23 */
     24
     25#include "qemu/osdep.h"
     26#include "hw/irq.h"
     27#include "hw/sysbus.h"
     28#include "migration/vmstate.h"
     29#include "qemu/module.h"
     30#include "qemu/timer.h"
     31#include "qom/object.h"
     32
     33#define TYPE_GPIOKEY "gpio-key"
     34OBJECT_DECLARE_SIMPLE_TYPE(GPIOKEYState, GPIOKEY)
     35#define GPIO_KEY_LATENCY 100 /* 100ms */
     36
     37struct GPIOKEYState {
     38    SysBusDevice parent_obj;
     39
     40    QEMUTimer *timer;
     41    qemu_irq irq;
     42};
     43
     44static const VMStateDescription vmstate_gpio_key = {
     45    .name = "gpio-key",
     46    .version_id = 1,
     47    .minimum_version_id = 1,
     48    .fields = (VMStateField[]) {
     49        VMSTATE_TIMER_PTR(timer, GPIOKEYState),
     50        VMSTATE_END_OF_LIST()
     51    }
     52};
     53
     54static void gpio_key_reset(DeviceState *dev)
     55{
     56    GPIOKEYState *s = GPIOKEY(dev);
     57
     58    timer_del(s->timer);
     59}
     60
     61static void gpio_key_timer_expired(void *opaque)
     62{
     63    GPIOKEYState *s = (GPIOKEYState *)opaque;
     64
     65    qemu_set_irq(s->irq, 0);
     66    timer_del(s->timer);
     67}
     68
     69static void gpio_key_set_irq(void *opaque, int irq, int level)
     70{
     71    GPIOKEYState *s = (GPIOKEYState *)opaque;
     72
     73    qemu_set_irq(s->irq, 1);
     74    timer_mod(s->timer,
     75              qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + GPIO_KEY_LATENCY);
     76}
     77
     78static void gpio_key_realize(DeviceState *dev, Error **errp)
     79{
     80    GPIOKEYState *s = GPIOKEY(dev);
     81    SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
     82
     83    sysbus_init_irq(sbd, &s->irq);
     84    qdev_init_gpio_in(dev, gpio_key_set_irq, 1);
     85    s->timer = timer_new_ms(QEMU_CLOCK_VIRTUAL, gpio_key_timer_expired, s);
     86}
     87
     88static void gpio_key_class_init(ObjectClass *klass, void *data)
     89{
     90    DeviceClass *dc = DEVICE_CLASS(klass);
     91
     92    dc->realize = gpio_key_realize;
     93    dc->vmsd = &vmstate_gpio_key;
     94    dc->reset = &gpio_key_reset;
     95}
     96
     97static const TypeInfo gpio_key_info = {
     98    .name          = TYPE_GPIOKEY,
     99    .parent        = TYPE_SYS_BUS_DEVICE,
    100    .instance_size = sizeof(GPIOKEYState),
    101    .class_init    = gpio_key_class_init,
    102};
    103
    104static void gpio_key_register_types(void)
    105{
    106    type_register_static(&gpio_key_info);
    107}
    108
    109type_init(gpio_key_register_types)