| 1 | /*␊ |
| 2 | * Copyright (c) 1999-2003 Apple Computer, Inc. All rights reserved.␊ |
| 3 | *␊ |
| 4 | * @APPLE_LICENSE_HEADER_START@␊ |
| 5 | * ␊ |
| 6 | * Portions Copyright (c) 1999-2003 Apple Computer, Inc. All Rights␊ |
| 7 | * Reserved. This file contains Original Code and/or Modifications of␊ |
| 8 | * Original Code as defined in and that are subject to the Apple Public␊ |
| 9 | * Source License Version 2.0 (the "License"). You may not use this file␊ |
| 10 | * except in compliance with the License. Please obtain a copy of the␊ |
| 11 | * License at http://www.apple.com/publicsource and read it before using␊ |
| 12 | * this file.␊ |
| 13 | * ␊ |
| 14 | * The Original Code and all software distributed under the License are␊ |
| 15 | * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER␊ |
| 16 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,␊ |
| 17 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,␊ |
| 18 | * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT. Please see the␊ |
| 19 | * License for the specific language governing rights and limitations␊ |
| 20 | * under the License.␊ |
| 21 | * ␊ |
| 22 | * @APPLE_LICENSE_HEADER_END@␊ |
| 23 | */␊ |
| 24 | /* ␊ |
| 25 | * Mach Operating System␊ |
| 26 | * Copyright (c) 1990 Carnegie-Mellon University␊ |
| 27 | * Copyright (c) 1989 Carnegie-Mellon University␊ |
| 28 | * All rights reserved. The CMU software License Agreement specifies␊ |
| 29 | * the terms and conditions for use and redistribution.␊ |
| 30 | */␊ |
| 31 | ␊ |
| 32 | /*␊ |
| 33 | * ␉␉␉INTEL CORPORATION PROPRIETARY INFORMATION␊ |
| 34 | *␊ |
| 35 | *␉This software is supplied under the terms of a license agreement or ␊ |
| 36 | *␉nondisclosure agreement with Intel Corporation and may not be copied ␊ |
| 37 | *␉nor disclosed except in accordance with the terms of that agreement.␊ |
| 38 | *␊ |
| 39 | *␉Copyright 1988, 1989 Intel Corporation␊ |
| 40 | */␊ |
| 41 | ␊ |
| 42 | /*␊ |
| 43 | * Copyright 1993 NeXT, Inc.␊ |
| 44 | * All rights reserved.␊ |
| 45 | */␊ |
| 46 | ␊ |
| 47 | //#include "libsaio.h"␊ |
| 48 | #include "libsa.h"␊ |
| 49 | #include "saio_internal.h"␊ |
| 50 | #include "io_inline.h"␊ |
| 51 | ␊ |
| 52 | /*␊ |
| 53 | * keyboard controller (8042) I/O port addresses␊ |
| 54 | */␊ |
| 55 | #define PORT_A 0x60 /* port A */␊ |
| 56 | #define PORT_B 0x64 /* port B */␊ |
| 57 | ␊ |
| 58 | /*␊ |
| 59 | * keyboard controller command␊ |
| 60 | */␊ |
| 61 | #define CMD_WOUT 0xd1 /* write controller's output port */␊ |
| 62 | ␊ |
| 63 | /*␊ |
| 64 | * keyboard controller status flags␊ |
| 65 | */␊ |
| 66 | #define KB_INFULL 0x2 /* input buffer full */␊ |
| 67 | #define KB_OUTFULL 0x1 /* output buffer full */␊ |
| 68 | ␊ |
| 69 | #define KB_A20 0x9f /* enable A20,␊ |
| 70 | enable output buffer full interrupt␊ |
| 71 | enable data line␊ |
| 72 | disable clock line */␊ |
| 73 | ␊ |
| 74 | //==========================================================================␊ |
| 75 | // Enable A20 gate to be able to access memory above 1MB␊ |
| 76 | ␊ |
| 77 | static inline void flushKeyboardInputBuffer()␊ |
| 78 | {␊ |
| 79 | unsigned char ret;␊ |
| 80 | /* Apparently all flags on means that they're invalid and that the code␊ |
| 81 | should stop trying to check them because they'll never change */␊ |
| 82 | do␊ |
| 83 | {␊ |
| 84 | ret = inb(PORT_B);␊ |
| 85 | } while( (ret != 0xff) && (ret & KB_INFULL));␊ |
| 86 | }␊ |
| 87 | ␊ |
| 88 | void enableA20()␊ |
| 89 | {␊ |
| 90 | /* make sure that the input buffer is empty */␊ |
| 91 | flushKeyboardInputBuffer();␊ |
| 92 | ␊ |
| 93 | /* make sure that the output buffer is empty */␊ |
| 94 | if (inb(PORT_B) & KB_OUTFULL)␊ |
| 95 | (void)inb(PORT_A);␊ |
| 96 | ␊ |
| 97 | /* make sure that the input buffer is empty */␊ |
| 98 | flushKeyboardInputBuffer();␊ |
| 99 | ␊ |
| 100 | /* write output port */␊ |
| 101 | outb(PORT_B, CMD_WOUT);␊ |
| 102 | delay(100);␊ |
| 103 | ␊ |
| 104 | /* wait until command is accepted */␊ |
| 105 | flushKeyboardInputBuffer();␊ |
| 106 | ␊ |
| 107 | outb(PORT_A, KB_A20);␊ |
| 108 | delay(100);␊ |
| 109 | ␊ |
| 110 | /* wait until done */␊ |
| 111 | flushKeyboardInputBuffer();␊ |
| 112 | }␊ |
| 113 | ␊ |
| 114 | //==========================================================================␊ |
| 115 | // Return the platform name for this hardware.␊ |
| 116 | //␊ |
| 117 | #ifndef BOOT1␊ |
| 118 | void␊ |
| 119 | getPlatformName(char *nameBuf)␊ |
| 120 | {␊ |
| 121 | strcpy(nameBuf, "ACPI");␊ |
| 122 | }␊ |
| 123 | #endif␊ |
| 124 | |
