LXR qemu/include/hw/timer/i8254

   1/*
   2 * QEMU 8253/8254 - internal interfaces
   3 *
   4 * Copyright (c) 2011 Jan Kiszka, Siemens AG
   5 *
   6 * Permission is hereby granted, free of charge, to any person obtaining a copy
   7 * of this software and associated documentation files (the "Software"), to deal
   8 * in the Software without restriction, including without limitation the rights
   9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10 * copies of the Software, and to permit persons to whom the Software is
  11 * furnished to do so, subject to the following conditions:
  12 *
  13 * The above copyright notice and this permission notice shall be included in
  14 * all copies or substantial portions of the Software.
  15 *
  16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22 * THE SOFTWARE.
  23 */
  24
  25#ifndef QEMU_I8254_INTERNAL_H
  26#define QEMU_I8254_INTERNAL_H
  27
  28#include "hw/hw.h"
  29#include "hw/isa/isa.h"
  30#include "qemu/timer.h"
  31
  32typedef struct PITChannelState {
  33    int count; /* can be 65536 */
  34    uint16_t latched_count;
  35    uint8_t count_latched;
  36    uint8_t status_latched;
  37    uint8_t status;
  38    uint8_t read_state;
  39    uint8_t write_state;
  40    uint8_t write_latch;
  41    uint8_t rw_mode;
  42    uint8_t mode;
  43    uint8_t bcd; /* not supported */
  44    uint8_t gate; /* timer start */
  45    int64_t count_load_time;
  46    /* irq handling */
  47    int64_t next_transition_time;
  48    QEMUTimer *irq_timer;
  49    qemu_irq irq;
  50    uint32_t irq_disabled;
  51} PITChannelState;
  52
  53typedef struct PITCommonState {
  54    ISADevice dev;
  55    MemoryRegion ioports;
  56    uint32_t iobase;
  57    PITChannelState channels[3];
  58} PITCommonState;
  59
  60typedef struct PITCommonClass {
  61    ISADeviceClass parent_class;
  62
  63    void (*set_channel_gate)(PITCommonState *s, PITChannelState *sc, int val);
  64    void (*get_channel_info)(PITCommonState *s, PITChannelState *sc,
  65                             PITChannelInfo *info);
  66    void (*pre_save)(PITCommonState *s);
  67    void (*post_load)(PITCommonState *s);
  68} PITCommonClass;
  69
  70int pit_get_out(PITChannelState *s, int64_t current_time);
  71int64_t pit_get_next_transition_time(PITChannelState *s, int64_t current_time);
  72void pit_get_channel_info_common(PITCommonState *s, PITChannelState *sc,
  73                                 PITChannelInfo *info);
  74void pit_reset_common(PITCommonState *s);
  75
  76#endif /* QEMU_I8254_INTERNAL_H */
  77