97 lines
2.7 KiB
C
97 lines
2.7 KiB
C
/* $NetBSD: x86emu_i8254.h,v 1.1 2007/12/21 17:45:50 joerg Exp $ */
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/*-
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* Copyright (c) 2007 Joerg Sonnenberger <joerg@NetBSD.org>.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _X86EMU_X86EMU_I8254_H
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#define _X86EMU_X86EMU_I8254_H
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#include <sys/time.h>
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#ifndef _KERNEL
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# include <stdbool.h>
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#else
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# include <sys/types.h>
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#endif
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struct x86emu_i8254_timer {
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/* Tick when the counter was started, 0 if it is inactive */
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uint64_t start_tick;
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/* GATE is raised */
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bool gate_high;
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/* The initial value of the counter */
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uint16_t active_counter;
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/* The current mode as bit pattern */
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uint8_t active_mode;
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/* The current setting of the BCD flag */
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bool active_is_bcd;
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/* Latched counter */
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uint16_t latched_counter;
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bool counter_is_latched;
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/* Latched status */
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uint8_t latched_status;
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bool status_is_latched;
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/* Read counter */
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bool read_lsb, read_msb;
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/* Write counter */
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uint8_t rw_status;
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uint16_t new_counter;
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uint8_t new_mode;
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bool new_is_bcd;
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bool null_count;
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bool write_lsb, write_msb;
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};
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struct x86emu_i8254 {
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struct x86emu_i8254_timer timer[3];
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struct timespec base_time;
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void (*gettime)(struct timespec *);
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};
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__BEGIN_DECLS
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void x86emu_i8254_init(struct x86emu_i8254 *, void (*)(struct timespec *));
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uint8_t x86emu_i8254_inb(struct x86emu_i8254 *, uint16_t);
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void x86emu_i8254_outb(struct x86emu_i8254 *, uint16_t, uint8_t);
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bool x86emu_i8254_claim_port(struct x86emu_i8254 *, uint16_t);
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__END_DECLS
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#endif
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