/* $NetBSD: x86emu_i8254.h,v 1.1 2007/12/21 17:45:50 joerg Exp $ */

/* $NetBSD: x86emu_i8254.h,v 1.1 2007/12/21 17:45:50 joerg Exp $ */

/*-
* Copyright (c) 2007 Joerg Sonnenberger <[email protected]>.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

#ifndef _X86EMU_X86EMU_I8254_H
#define _X86EMU_X86EMU_I8254_H

#include <sys/time.h>

#ifndef _KERNEL
# include <stdbool.h>
#else
# include <sys/types.h>
#endif

struct x86emu_i8254_timer {
/* Tick when the counter was started, 0 if it is inactive */
uint64_t start_tick;

/* GATE is raised */
bool gate_high;

/* The initial value of the counter */
uint16_t active_counter;

/* The current mode as bit pattern */
uint8_t active_mode;

/* The current setting of the BCD flag */
bool active_is_bcd;

/* Latched counter */
uint16_t latched_counter;
bool counter_is_latched;

/* Latched status */
uint8_t latched_status;
bool status_is_latched;

/* Read counter */
bool read_lsb, read_msb;

/* Write counter */
uint8_t rw_status;
uint16_t new_counter;
uint8_t new_mode;
bool new_is_bcd;
bool null_count;

bool write_lsb, write_msb;
};

struct x86emu_i8254 {
struct x86emu_i8254_timer timer[3];
struct timespec base_time;

void (*gettime)(struct timespec *);
};

__BEGIN_DECLS

void x86emu_i8254_init(struct x86emu_i8254 *, void (*)(struct timespec *));
uint8_t x86emu_i8254_inb(struct x86emu_i8254 *, uint16_t);
void x86emu_i8254_outb(struct x86emu_i8254 *, uint16_t, uint8_t);
bool x86emu_i8254_claim_port(struct x86emu_i8254 *, uint16_t);

__END_DECLS

#endif