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      1 /* $NetBSD: x86emu_i8254.h,v 1.1 2007/12/21 17:45:50 joerg Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2007 Joerg Sonnenberger <joerg (at) NetBSD.org>.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  *
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in
     15  *    the documentation and/or other materials provided with the
     16  *    distribution.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
     21  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
     22  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
     23  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
     24  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     25  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     26  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     27  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
     28  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #ifndef _X86EMU_X86EMU_I8254_H
     33 #define _X86EMU_X86EMU_I8254_H
     34 
     35 #include <sys/time.h>
     36 
     37 #ifndef _KERNEL
     38 #  include <stdbool.h>
     39 #else
     40 #  include <sys/types.h>
     41 #endif
     42 
     43 struct x86emu_i8254_timer {
     44 	/* Tick when the counter was started, 0 if it is inactive */
     45 	uint64_t start_tick;
     46 
     47 	/* GATE is raised */
     48 	bool gate_high;
     49 
     50 	/* The initial value of the counter */
     51 	uint16_t active_counter;
     52 
     53 	/* The current mode as bit pattern */
     54 	uint8_t active_mode;
     55 
     56 	/* The current setting of the BCD flag */
     57 	bool active_is_bcd;
     58 
     59 	/* Latched counter */
     60 	uint16_t latched_counter;
     61 	bool counter_is_latched;
     62 
     63 	/* Latched status */
     64 	uint8_t latched_status;
     65 	bool status_is_latched;
     66 
     67 	/* Read counter */
     68 	bool read_lsb, read_msb;
     69 
     70 	/* Write counter */
     71 	uint8_t rw_status;
     72 	uint16_t new_counter;
     73 	uint8_t new_mode;
     74 	bool new_is_bcd;
     75 	bool null_count;
     76 
     77 	bool write_lsb, write_msb;
     78 };
     79 
     80 struct x86emu_i8254 {
     81 	struct x86emu_i8254_timer timer[3];
     82 	struct timespec base_time;
     83 
     84 	void (*gettime)(struct timespec *);
     85 };
     86 
     87 __BEGIN_DECLS
     88 
     89 void	x86emu_i8254_init(struct x86emu_i8254 *, void (*)(struct timespec *));
     90 uint8_t	x86emu_i8254_inb(struct x86emu_i8254 *, uint16_t);
     91 void	x86emu_i8254_outb(struct x86emu_i8254 *, uint16_t, uint8_t);
     92 bool	x86emu_i8254_claim_port(struct x86emu_i8254 *, uint16_t);
     93 
     94 __END_DECLS
     95 
     96 #endif
     97