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/* $OpenBSD: i8253.h,v 1.10 2022/09/01 22:01:40 dv Exp $ */
/*
* Copyright (c) 2016 Mike Larkin <mlarkin@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* Emulated i8253 PIT (counter)
*/
#define TIMER_BASE 0x40 /* 8253 timer 0 */
#define TIMER_CTRL 0x43 /* 8253 timer control */
#define NS_PER_TICK (1000000000 / TIMER_FREQ)
#define TIMER_RB_COUNT 0x20 /* read back count value */
#define TIMER_RB_STATUS 0x10 /* read back status */
#define TIMER_RB_C0 0x2 /* read back channel 0 */
#define TIMER_RB_C1 0x4 /* read back channel 1 */
#define TIMER_RB_C2 0x8 /* read back channel 1 */
#define PCKBC_AUX 0x61 /* PC keyboard aux port for i8253 misc access */
/* i8253 registers */
struct i8253_channel {
struct timespec ts; /* timer start time */
uint16_t start; /* starting value */
uint16_t olatch; /* output latch */
uint16_t ilatch; /* input latch */
uint8_t last_r; /* last read byte (MSB/LSB) */
uint8_t last_w; /* last written byte (MSB/LSB) */
uint8_t mode; /* counter mode */
uint8_t rbs; /* channel is in readback status mode */
struct event timer; /* timer event for this counter */
uint32_t vm_id; /* owning VM id */
int in_use; /* denotes if this counter was ever used */
uint8_t state; /* 0 if channel is counting, 1 if fired */
};
void i8253_init(uint32_t);
void i8253_reset(uint8_t);
void i8253_fire(int, short, void *);
int i8253_dump(int);
int i8253_restore(int, uint32_t);
uint8_t vcpu_exit_i8253(struct vm_run_params *);
uint8_t vcpu_exit_i8253_misc(struct vm_run_params *);
void i8253_do_readback(uint32_t);
void i8253_stop(void);
void i8253_start(void);
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