hw/i8254.h

   1 /*
   2  * QEMU 8253/8254 interval timer emulation
   3  *
   4  * Copyright (c) 2003-2004 Fabrice Bellard
   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_H
  26 #define QEMU_I8254_H
  27
  28 #define PIT_SAVEVM_NAME "i8254"
  29 #define PIT_SAVEVM_VERSION 2
  30
  31 #define RW_STATE_LSB 1
  32 #define RW_STATE_MSB 2
  33 #define RW_STATE_WORD0 3
  34 #define RW_STATE_WORD1 4
  35
  36 #define PIT_FLAGS_HPET_LEGACY  1
  37
  38 typedef struct PITChannelState {
  39     int count; /* can be 65536 */
  40     uint16_t latched_count;
  41     uint8_t count_latched;
  42     uint8_t status_latched;
  43     uint8_t status;
  44     uint8_t read_state;
  45     uint8_t write_state;
  46     uint8_t write_latch;
  47     uint8_t rw_mode;
  48     uint8_t mode;
  49     uint8_t bcd; /* not supported */
  50     uint8_t gate; /* timer start */
  51     int64_t count_load_time;
  52     /* irq handling */
  53     int64_t next_transition_time;
  54     QEMUTimer *irq_timer;
  55     qemu_irq irq;
  56 } PITChannelState;
  57
  58 struct PITState {
  59     PITChannelState channels[3];
  60     uint32_t flags;
  61 };
  62
  63 void pit_save(QEMUFile *f, void *opaque);
  64
  65 int pit_load(QEMUFile *f, void *opaque, int version_id);
  66
  67 void pit_reset(void *opaque);
  68
  69 #endif