common/include/x86emu/x86emu_i8254.h

   1 /* $NetBSD: alloc.c,v 1.2 2007/06/25 21:38:43 joerg Exp $ */
   2
   3 /*-
   4  * Copyright (c) 2007 Joerg Sonnenberger <joerg@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