| 1 | /* $NetBSD: nvram.h,v 1.8 2005/12/11 12:17:43 christos Exp $ */ |
| 2 | |
| 3 | /*- |
| 4 | * Copyright (c) 1990, 1993 |
| 5 | * The Regents of the University of California. All rights reserved. |
| 6 | * |
| 7 | * This code is derived from software contributed to Berkeley by |
| 8 | * William Jolitz. |
| 9 | * |
| 10 | * Redistribution and use in source and binary forms, with or without |
| 11 | * modification, are permitted provided that the following conditions |
| 12 | * are met: |
| 13 | * 1. Redistributions of source code must retain the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer. |
| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer in the |
| 17 | * documentation and/or other materials provided with the distribution. |
| 18 | * 3. Neither the name of the University nor the names of its contributors |
| 19 | * may be used to endorse or promote products derived from this software |
| 20 | * without specific prior written permission. |
| 21 | * |
| 22 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 23 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 24 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 25 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 26 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 27 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 28 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 29 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 30 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 31 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 32 | * SUCH DAMAGE. |
| 33 | * |
| 34 | * @(#)rtc.h 8.1 (Berkeley) 6/11/93 |
| 35 | */ |
| 36 | |
| 37 | /* |
| 38 | * The following information is found in the non-volatile RAM in the |
| 39 | * MC146818A (or DS1287A or other compatible) RTC on AT-compatible PCs. |
| 40 | */ |
| 41 | |
| 42 | /* NVRAM byte 0: bios diagnostic */ |
| 43 | #define NVRAM_DIAG (MC_NVRAM_START + 0) /* RTC offset 0xe */ |
| 44 | |
| 45 | #define NVRAM_DIAG_BITS "\020\010clock_battery\007ROM_cksum\006config_unit\005memory_size\004fixed_disk\003invalid_time" |
| 46 | |
| 47 | /* NVRAM byte 1: reset code */ |
| 48 | #define NVRAM_RESET (MC_NVRAM_START + 1) /* RTC offset 0xf */ |
| 49 | |
| 50 | #define NVRAM_RESET_RST 0x00 /* normal reset */ |
| 51 | #define NVRAM_RESET_LOAD 0x04 /* load system */ |
| 52 | #define NVRAM_RESET_JUMP 0x0a /* jump through 40:67 */ |
| 53 | |
| 54 | /* NVRAM byte 2: diskette drive type in upper/lower nibble */ |
| 55 | #define NVRAM_DISKETTE (MC_NVRAM_START + 2) /* RTC offset 0x10 */ |
| 56 | |
| 57 | #define NVRAM_DISKETTE_NONE 0 /* none present */ |
| 58 | #define NVRAM_DISKETTE_360K 0x10 /* 360K */ |
| 59 | #define NVRAM_DISKETTE_12M 0x20 /* 1.2M */ |
| 60 | #define NVRAM_DISKETTE_720K 0x30 /* 720K */ |
| 61 | #define NVRAM_DISKETTE_144M 0x40 /* 1.44M */ |
| 62 | #define NVRAM_DISKETTE_TYPE5 0x50 /* 2.88M, presumably */ |
| 63 | #define NVRAM_DISKETTE_TYPE6 0x60 /* 2.88M */ |
| 64 | |
| 65 | /* NVRAM byte 6: equipment type */ |
| 66 | #define NVRAM_EQUIPMENT (MC_NVRAM_START + 6) |
| 67 | |
| 68 | #define NVRAM_EQUIPMENT_EGAVGA 0x00 /* EGA or VGA */ |
| 69 | #define NVRAM_EQUIPMENT_COLOR40 0x10 /* 40 column color */ |
| 70 | #define NVRAM_EQUIPMENT_COLOR80 0x20 /* 80 column color */ |
| 71 | #define NVRAM_EQUIPMENT_MONO80 0x30 /* 80 column mono */ |
| 72 | #define NVRAM_EQUIPMENT_MONITOR 0x30 /* mask for monitor type */ |
| 73 | |
| 74 | /* NVRAM bytes 7 & 8: base memory size */ |
| 75 | #define NVRAM_BASELO (MC_NVRAM_START + 7) /* low byte; RTC off. 0x15 */ |
| 76 | #define NVRAM_BASEHI (MC_NVRAM_START + 8) /* high byte; RTC off. 0x16 */ |
| 77 | |
| 78 | /* NVRAM bytes 9 & 10: extended memory size */ |
| 79 | #define NVRAM_EXTLO (MC_NVRAM_START + 9) /* low byte; RTC off. 0x17 */ |
| 80 | #define NVRAM_EXTHI (MC_NVRAM_START + 10) /* high byte; RTC off. 0x18 */ |
| 81 | |
| 82 | /* NVRAM byte 36: current century. (please increment in Dec99!) */ |
| 83 | #define NVRAM_CENTURY (MC_NVRAM_START + 36) /* RTC offset 0x32 */ |
| 84 | |