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

m41t80.c (2584B)

      1/*
      2 * M41T80 serial rtc emulation
      3 *
      4 * Copyright (c) 2018 BALATON Zoltan
      5 *
      6 * This work is licensed under the GNU GPL license version 2 or later.
      7 *
      8 */
      9
     10#include "qemu/osdep.h"
     11#include "qemu-common.h"
     12#include "qemu/log.h"
     13#include "qemu/module.h"
     14#include "qemu/timer.h"
     15#include "qemu/bcd.h"
     16#include "hw/i2c/i2c.h"
     17#include "qom/object.h"
     18
     19#define TYPE_M41T80 "m41t80"
     20OBJECT_DECLARE_SIMPLE_TYPE(M41t80State, M41T80)
     21
     22struct M41t80State {
     23    I2CSlave parent_obj;
     24    int8_t addr;
     25};
     26
     27static void m41t80_realize(DeviceState *dev, Error **errp)
     28{
     29    M41t80State *s = M41T80(dev);
     30
     31    s->addr = -1;
     32}
     33
     34static int m41t80_send(I2CSlave *i2c, uint8_t data)
     35{
     36    M41t80State *s = M41T80(i2c);
     37
     38    if (s->addr < 0) {
     39        s->addr = data;
     40    } else {
     41        s->addr++;
     42    }
     43    return 0;
     44}
     45
     46static uint8_t m41t80_recv(I2CSlave *i2c)
     47{
     48    M41t80State *s = M41T80(i2c);
     49    struct tm now;
     50    qemu_timeval tv;
     51
     52    if (s->addr < 0) {
     53        s->addr = 0;
     54    }
     55    if (s->addr >= 1 && s->addr <= 7) {
     56        qemu_get_timedate(&now, -1);
     57    }
     58    switch (s->addr++) {
     59    case 0:
     60        qemu_gettimeofday(&tv);
     61        return to_bcd(tv.tv_usec / 10000);
     62    case 1:
     63        return to_bcd(now.tm_sec);
     64    case 2:
     65        return to_bcd(now.tm_min);
     66    case 3:
     67        return to_bcd(now.tm_hour);
     68    case 4:
     69        return to_bcd(now.tm_wday);
     70    case 5:
     71        return to_bcd(now.tm_mday);
     72    case 6:
     73        return to_bcd(now.tm_mon + 1);
     74    case 7:
     75        return to_bcd(now.tm_year % 100);
     76    case 8 ... 19:
     77        qemu_log_mask(LOG_UNIMP, "%s: unimplemented register: %d\n",
     78                      __func__, s->addr - 1);
     79        return 0;
     80    default:
     81        qemu_log_mask(LOG_GUEST_ERROR, "%s: invalid register: %d\n",
     82                      __func__, s->addr - 1);
     83        return 0;
     84    }
     85}
     86
     87static int m41t80_event(I2CSlave *i2c, enum i2c_event event)
     88{
     89    M41t80State *s = M41T80(i2c);
     90
     91    if (event == I2C_START_SEND) {
     92        s->addr = -1;
     93    }
     94    return 0;
     95}
     96
     97static void m41t80_class_init(ObjectClass *klass, void *data)
     98{
     99    DeviceClass *dc = DEVICE_CLASS(klass);
    100    I2CSlaveClass *sc = I2C_SLAVE_CLASS(klass);
    101
    102    dc->realize = m41t80_realize;
    103    sc->send = m41t80_send;
    104    sc->recv = m41t80_recv;
    105    sc->event = m41t80_event;
    106}
    107
    108static const TypeInfo m41t80_info = {
    109    .name          = TYPE_M41T80,
    110    .parent        = TYPE_I2C_SLAVE,
    111    .instance_size = sizeof(M41t80State),
    112    .class_init    = m41t80_class_init,
    113};
    114
    115static void m41t80_register_types(void)
    116{
    117    type_register_static(&m41t80_info);
    118}
    119
    120type_init(m41t80_register_types)