| 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@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 | |