[38699] | 1 | /*
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| 2 | * Copyright (C) 2006-2011 Oracle Corporation
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| 3 | *
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| 4 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 5 | * available from http://www.virtualbox.org. This file is free software;
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| 6 | * you can redistribute it and/or modify it under the terms of the GNU
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| 7 | * General Public License (GPL) as published by the Free Software
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| 8 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 9 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 10 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 11 | * --------------------------------------------------------------------
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| 12 | *
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| 13 | * This code is based on:
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| 14 | *
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| 15 | * ROM BIOS for use with Bochs/Plex86/QEMU emulation environment
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| 16 | *
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| 17 | * Copyright (C) 2002 MandrakeSoft S.A.
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| 18 | *
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| 19 | * MandrakeSoft S.A.
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| 20 | * 43, rue d'Aboukir
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| 21 | * 75002 Paris - France
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| 22 | * http://www.linux-mandrake.com/
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| 23 | * http://www.mandrakesoft.com/
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| 24 | *
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| 25 | * This library is free software; you can redistribute it and/or
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| 26 | * modify it under the terms of the GNU Lesser General Public
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| 27 | * License as published by the Free Software Foundation; either
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| 28 | * version 2 of the License, or (at your option) any later version.
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| 29 | *
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| 30 | * This library is distributed in the hope that it will be useful,
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| 31 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 32 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 33 | * Lesser General Public License for more details.
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| 34 | *
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| 35 | * You should have received a copy of the GNU Lesser General Public
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| 36 | * License along with this library; if not, write to the Free Software
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| 37 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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| 38 | *
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| 39 | */
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| 40 |
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| 41 |
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| 42 | #include <stdint.h>
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| 43 | #include "inlines.h"
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| 44 | #include "biosint.h"
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| 45 |
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| 46 | //////////////////////
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| 47 | // FLOPPY functions //
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| 48 | //////////////////////
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| 49 |
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| 50 | void set_diskette_ret_status(uint8_t value)
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| 51 | {
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| 52 | write_byte(0x0040, 0x0041, value);
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| 53 | }
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| 54 |
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| 55 | void set_diskette_current_cyl(uint8_t drive, uint8_t cyl)
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| 56 | {
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| 57 | if (drive > 1)
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| 58 | BX_PANIC("set_diskette_current_cyl: drive > 1\n");
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| 59 | write_byte(0x0040, 0x0094+drive, cyl);
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| 60 | }
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| 61 |
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| 62 | #if 1 //BX_SUPPORT_FLOPPY
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| 63 |
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| 64 | #if DEBUG_INT13_FL
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| 65 | # define BX_DEBUG_INT13_FL(...) BX_DEBUG(__VA_ARGS__)
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| 66 | #else
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| 67 | # define BX_DEBUG_INT13_FL(...)
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| 68 | #endif
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| 69 |
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| 70 | #define BX_FLOPPY_ON_CNT 37 /* 2 seconds */
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| 71 |
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| 72 | extern int diskette_param_table; /* At a fixed location. */
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| 73 |
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| 74 | void floppy_reset_controller(void)
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| 75 | {
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| 76 | uint8_t val8;
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| 77 |
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| 78 | // Reset controller
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| 79 | val8 = inb(0x03f2);
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| 80 | outb(0x03f2, val8 & ~0x04);
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| 81 | outb(0x03f2, val8 | 0x04);
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| 82 |
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| 83 | // Wait for controller to come out of reset
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| 84 | do {
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| 85 | val8 = inb(0x3f4);
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| 86 | } while ( (val8 & 0xc0) != 0x80 );
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| 87 | }
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| 88 |
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| 89 | void floppy_prepare_controller(uint16_t drive)
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| 90 | {
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| 91 | uint8_t val8, dor, prev_reset;
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| 92 |
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| 93 | // set 40:3e bit 7 to 0
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| 94 | val8 = read_byte(0x0040, 0x003e);
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| 95 | val8 &= 0x7f;
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| 96 | write_byte(0x0040, 0x003e, val8);
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| 97 |
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| 98 | // turn on motor of selected drive, DMA & int enabled, normal operation
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| 99 | prev_reset = inb(0x03f2) & 0x04;
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| 100 | if (drive)
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| 101 | dor = 0x20;
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| 102 | else
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| 103 | dor = 0x10;
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| 104 | dor |= 0x0c;
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| 105 | dor |= drive;
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| 106 | outb(0x03f2, dor);
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| 107 |
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| 108 | // reset the disk motor timeout value of INT 08
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| 109 | write_byte(0x40,0x40, BX_FLOPPY_ON_CNT);
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| 110 |
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| 111 | // program data rate
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| 112 | val8 = read_byte(0x0040, 0x008b);
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| 113 | val8 >>= 6;
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| 114 | outb(0x03f7, val8);
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| 115 |
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| 116 | // wait for drive readiness
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| 117 | do {
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| 118 | val8 = inb(0x3f4);
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| 119 | } while ( (val8 & 0xc0) != 0x80 );
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| 120 |
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| 121 | if (prev_reset == 0) {
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| 122 | // turn on interrupts
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| 123 | int_enable();
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| 124 | // wait on 40:3e bit 7 to become 1
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| 125 | do {
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| 126 | val8 = read_byte(0x0040, 0x003e);
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| 127 | } while ( (val8 & 0x80) == 0 );
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| 128 | val8 &= 0x7f;
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| 129 | int_disable();
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| 130 | write_byte(0x0040, 0x003e, val8);
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| 131 | }
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| 132 | }
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| 133 |
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| 134 | bx_bool floppy_media_known(uint16_t drive)
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| 135 | {
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| 136 | uint8_t val8;
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| 137 | uint16_t media_state_offset;
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| 138 |
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| 139 | val8 = read_byte(0x0040, 0x003e); // diskette recal status
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| 140 | if (drive)
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| 141 | val8 >>= 1;
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| 142 | val8 &= 0x01;
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| 143 | if (val8 == 0)
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| 144 | return 0;
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| 145 |
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| 146 | media_state_offset = 0x0090;
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| 147 | if (drive)
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| 148 | media_state_offset += 1;
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| 149 |
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| 150 | val8 = read_byte(0x0040, media_state_offset);
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| 151 | val8 = (val8 >> 4) & 0x01;
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| 152 | if (val8 == 0)
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| 153 | return 0;
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| 154 |
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| 155 | // checks passed, return KNOWN
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| 156 | return 1;
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| 157 | }
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| 158 |
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| 159 | bx_bool floppy_read_id(uint16_t drive)
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| 160 | {
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| 161 | uint8_t val8;
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| 162 | uint8_t return_status[7];
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| 163 | int i;
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| 164 |
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| 165 | floppy_prepare_controller(drive);
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| 166 |
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| 167 | // send Read ID command (2 bytes) to controller
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| 168 | outb(0x03f5, 0x4a); // 4a: Read ID (MFM)
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| 169 | outb(0x03f5, drive); // 0=drive0, 1=drive1, head always 0
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| 170 |
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| 171 | // turn on interrupts
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| 172 | int_enable();
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| 173 |
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| 174 | // wait on 40:3e bit 7 to become 1
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| 175 | do {
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| 176 | val8 = (read_byte(0x0040, 0x003e) & 0x80);
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| 177 | } while ( val8 == 0 );
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| 178 |
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| 179 | val8 = 0; // separate asm from while() loop
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| 180 | // turn off interrupts
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| 181 | int_disable();
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| 182 |
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| 183 | // read 7 return status bytes from controller
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| 184 | for (i = 0; i < 7; ++i) {
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| 185 | return_status[i] = inb(0x3f5);
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| 186 | }
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| 187 |
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| 188 | if ( (return_status[0] & 0xc0) != 0 )
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| 189 | return 0;
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| 190 | else
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| 191 | return 1;
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| 192 | }
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| 193 |
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| 194 | bx_bool floppy_drive_recal(uint16_t drive)
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| 195 | {
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| 196 | uint8_t val8;
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| 197 | uint16_t curr_cyl_offset;
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| 198 |
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| 199 | floppy_prepare_controller(drive);
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| 200 |
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| 201 | // send Recalibrate command (2 bytes) to controller
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| 202 | outb(0x03f5, 0x07); // 07: Recalibrate
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| 203 | outb(0x03f5, drive); // 0=drive0, 1=drive1
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| 204 |
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| 205 | // turn on interrupts
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| 206 | int_enable();
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| 207 |
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| 208 | // wait on 40:3e bit 7 to become 1
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| 209 | do {
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| 210 | val8 = (read_byte(0x0040, 0x003e) & 0x80);
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| 211 | } while ( val8 == 0 );
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| 212 |
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| 213 | val8 = 0; // separate asm from while() loop
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| 214 | // turn off interrupts
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| 215 | int_disable();
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| 216 |
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| 217 | // set 40:3e bit 7 to 0, and calibrated bit
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| 218 | val8 = read_byte(0x0040, 0x003e);
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| 219 | val8 &= 0x7f;
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| 220 | if (drive) {
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| 221 | val8 |= 0x02; // Drive 1 calibrated
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| 222 | curr_cyl_offset = 0x0095;
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| 223 | } else {
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| 224 | val8 |= 0x01; // Drive 0 calibrated
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| 225 | curr_cyl_offset = 0x0094;
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| 226 | }
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| 227 | write_byte(0x0040, 0x003e, val8);
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| 228 | write_byte(0x0040, curr_cyl_offset, 0); // current cylinder is 0
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| 229 |
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| 230 | return 1;
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| 231 | }
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| 232 |
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| 233 |
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| 234 | bx_bool floppy_media_sense(uint16_t drive)
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| 235 | {
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| 236 | bx_bool retval;
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| 237 | uint16_t media_state_offset;
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| 238 | uint8_t drive_type, config_data, media_state;
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| 239 |
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| 240 | if (floppy_drive_recal(drive) == 0)
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| 241 | return 0;
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| 242 |
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| 243 | // Try the diskette data rates in the following order:
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| 244 | // 1 Mbps -> 500 Kbps -> 300 Kbps -> 250 Kbps
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| 245 | // The 1 Mbps rate is only tried for 2.88M drives.
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| 246 |
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| 247 | // ** config_data **
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| 248 | // Bitfields for diskette media control:
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| 249 | // Bit(s) Description (Table M0028)
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| 250 | // 7-6 last data rate set by controller
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| 251 | // 00=500kbps, 01=300kbps, 10=250kbps, 11=1Mbps
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| 252 | // 5-4 last diskette drive step rate selected
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| 253 | // 00=0Ch, 01=0Dh, 10=0Eh, 11=0Ah
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| 254 | // 3-2 {data rate at start of operation}
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| 255 | // 1-0 reserved
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| 256 |
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| 257 | // ** media_state **
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| 258 | // Bitfields for diskette drive media state:
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| 259 | // Bit(s) Description (Table M0030)
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| 260 | // 7-6 data rate
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| 261 | // 00=500kbps, 01=300kbps, 10=250kbps, 11=1Mbps
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| 262 | // 5 double stepping required (e.g. 360kB in 1.2MB)
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| 263 | // 4 media type established
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| 264 | // 3 drive capable of supporting 4MB media
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| 265 | // 2-0 on exit from BIOS, contains
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| 266 | // 000 trying 360kB in 360kB
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| 267 | // 001 trying 360kB in 1.2MB
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| 268 | // 010 trying 1.2MB in 1.2MB
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| 269 | // 011 360kB in 360kB established
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| 270 | // 100 360kB in 1.2MB established
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| 271 | // 101 1.2MB in 1.2MB established
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| 272 | // 110 reserved
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| 273 | // 111 all other formats/drives
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| 274 |
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| 275 | // @todo: break out drive type determination
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| 276 | drive_type = inb_cmos(0x10);
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| 277 | if (drive == 0)
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| 278 | drive_type >>= 4;
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| 279 | else
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| 280 | drive_type &= 0x0f;
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| 281 | if ( drive_type == 1 ) {
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| 282 | // 360K 5.25" drive
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| 283 | config_data = 0x00; // 0000 0000
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| 284 | media_state = 0x15; // 0001 0101
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| 285 | retval = 1;
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| 286 | }
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| 287 | else if ( drive_type == 2 ) {
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| 288 | // 1.2 MB 5.25" drive
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| 289 | config_data = 0x00; // 0000 0000
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| 290 | media_state = 0x35; // 0011 0101 // need double stepping??? (bit 5)
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| 291 | retval = 1;
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| 292 | }
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| 293 | else if ( drive_type == 3 ) {
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| 294 | // 720K 3.5" drive
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| 295 | config_data = 0x00; // 0000 0000 ???
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| 296 | media_state = 0x17; // 0001 0111
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| 297 | retval = 1;
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| 298 | }
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| 299 | else if ( drive_type == 4 ) {
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| 300 | // 1.44 MB 3.5" drive
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| 301 | config_data = 0x00; // 0000 0000
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| 302 | media_state = 0x17; // 0001 0111
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| 303 | retval = 1;
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| 304 | }
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| 305 | else if ( drive_type == 5 ) {
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| 306 | // 2.88 MB 3.5" drive
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| 307 | config_data = 0xCC; // 1100 1100
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| 308 | media_state = 0xD7; // 1101 0111
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| 309 | retval = 1;
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| 310 | }
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| 311 | // Extended floppy size uses special cmos setting
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| 312 | else if ( drive_type == 6 ) {
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| 313 | // 160k 5.25" drive
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| 314 | config_data = 0x00; // 0000 0000
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| 315 | media_state = 0x27; // 0010 0111
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| 316 | retval = 1;
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| 317 | }
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| 318 | else if ( drive_type == 7 ) {
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| 319 | // 180k 5.25" drive
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| 320 | config_data = 0x00; // 0000 0000
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| 321 | media_state = 0x27; // 0010 0111
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| 322 | retval = 1;
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| 323 | }
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| 324 | else if ( drive_type == 8 ) {
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| 325 | // 320k 5.25" drive
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| 326 | config_data = 0x00; // 0000 0000
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| 327 | media_state = 0x27; // 0010 0111
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| 328 | retval = 1;
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| 329 | }
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| 330 | else {
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| 331 | // not recognized
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| 332 | config_data = 0x00; // 0000 0000
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| 333 | media_state = 0x00; // 0000 0000
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| 334 | retval = 0;
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| 335 | }
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| 336 |
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| 337 | write_byte(0x0040, 0x008B, config_data);
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| 338 | while (!floppy_read_id(drive)) {
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| 339 | if ((config_data & 0xC0) == 0x80) {
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| 340 | // If even 250 Kbps failed, we can't do much
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| 341 | break;
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| 342 | }
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| 343 | switch (config_data & 0xC0) {
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| 344 | case 0xC0: // 1 Mbps
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| 345 | config_data = config_data & 0x3F | 0x00;
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| 346 | break;
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| 347 | case 0x00: // 500 Kbps
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| 348 | config_data = config_data & 0x3F | 0x40;
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| 349 | break;
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| 350 | case 0x40: // 300 Kbps
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| 351 | config_data = config_data & 0x3F | 0x80;
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| 352 | break;
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| 353 | }
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| 354 | write_byte(0x0040, 0x008B, config_data);
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| 355 | }
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| 356 |
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| 357 | if (drive == 0)
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| 358 | media_state_offset = 0x0090;
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| 359 | else
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| 360 | media_state_offset = 0x0091;
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| 361 | write_byte(0x0040, 0x008B, config_data);
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| 362 | write_byte(0x0040, media_state_offset, media_state);
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| 363 |
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| 364 | return retval;
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| 365 | }
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| 366 |
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| 367 |
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| 368 | bx_bool floppy_drive_exists(uint16_t drive)
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| 369 | {
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| 370 | uint8_t drive_type;
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| 371 |
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| 372 | // check CMOS to see if drive exists
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| 373 | // @todo: break out drive type determination
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| 374 | drive_type = inb_cmos(0x10);
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| 375 | if (drive == 0)
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| 376 | drive_type >>= 4;
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| 377 | else
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| 378 | drive_type &= 0x0f;
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| 379 | return drive_type != 0;
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| 380 | }
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| 381 |
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| 382 | //@todo: put in a header
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| 383 | #define AX r.gr.u.r16.ax
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| 384 | #define BX r.gr.u.r16.bx
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| 385 | #define CX r.gr.u.r16.cx
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| 386 | #define DX r.gr.u.r16.dx
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| 387 | #define SI r.gr.u.r16.si
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| 388 | #define DI r.gr.u.r16.di
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| 389 | #define BP r.gr.u.r16.bp
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| 390 | #define ELDX r.gr.u.r16.sp
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| 391 | #define DS r.ds
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| 392 | #define ES r.es
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| 393 | #define FLAGS r.ra.flags.u.r16.flags
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| 394 |
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| 395 | void BIOSCALL int13_diskette_function(disk_regs_t r)
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| 396 | {
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| 397 | uint8_t drive, num_sectors, track, sector, head;
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| 398 | uint16_t base_address, base_count, base_es;
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| 399 | uint8_t page, mode_register, val8;
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| 400 | uint8_t return_status[7];
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| 401 | uint8_t drive_type, num_floppies, ah;
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| 402 | uint16_t last_addr;
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| 403 | int i;
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| 404 |
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| 405 | BX_DEBUG_INT13_FL("%s: AX=%04x BX=%04x CX=%04x DX=%04x ES=%04x\n", __func__, AX, BX, CX, DX, ES);
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| 406 |
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| 407 | ah = GET_AH();
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| 408 |
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| 409 | switch ( ah ) {
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| 410 | case 0x00: // diskette controller reset
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| 411 | BX_DEBUG_INT13_FL("floppy f00\n");
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| 412 | drive = GET_ELDL();
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| 413 | if (drive > 1) {
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| 414 | SET_AH(1); // invalid param
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| 415 | set_diskette_ret_status(1);
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| 416 | SET_CF();
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| 417 | return;
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| 418 | }
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| 419 | // @todo: break out drive type determination
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| 420 | drive_type = inb_cmos(0x10);
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| 421 | if (drive == 0)
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| 422 | drive_type >>= 4;
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| 423 | else
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| 424 | drive_type &= 0x0f;
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| 425 | if (drive_type == 0) {
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| 426 | SET_AH(0x80); // drive not responding
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| 427 | set_diskette_ret_status(0x80);
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| 428 | SET_CF();
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| 429 | return;
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| 430 | }
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| 431 |
|
---|
| 432 | // force re-calibration etc.
|
---|
| 433 | write_byte(0x0040, 0x003e, 0);
|
---|
| 434 |
|
---|
| 435 | SET_AH(0);
|
---|
| 436 | set_diskette_ret_status(0);
|
---|
| 437 | CLEAR_CF(); // successful
|
---|
| 438 | set_diskette_current_cyl(drive, 0); // current cylinder
|
---|
| 439 | return;
|
---|
| 440 |
|
---|
| 441 | case 0x01: // Read Diskette Status
|
---|
| 442 | CLEAR_CF();
|
---|
| 443 | val8 = read_byte(0x0000, 0x0441);
|
---|
| 444 | SET_AH(val8);
|
---|
| 445 | if (val8) {
|
---|
| 446 | SET_CF();
|
---|
| 447 | }
|
---|
| 448 | return;
|
---|
| 449 |
|
---|
| 450 | case 0x02: // Read Diskette Sectors
|
---|
| 451 | case 0x03: // Write Diskette Sectors
|
---|
| 452 | case 0x04: // Verify Diskette Sectors
|
---|
| 453 | num_sectors = GET_AL();
|
---|
| 454 | track = GET_CH();
|
---|
| 455 | sector = GET_CL();
|
---|
| 456 | head = GET_DH();
|
---|
| 457 | drive = GET_ELDL();
|
---|
| 458 |
|
---|
| 459 | if ( (drive > 1) || (head > 1) ||
|
---|
| 460 | (num_sectors == 0) || (num_sectors > 72) ) {
|
---|
| 461 | BX_INFO("%s: drive>1 || head>1 ...\n", __func__);
|
---|
| 462 | SET_AH(1);
|
---|
| 463 | set_diskette_ret_status(1);
|
---|
| 464 | SET_AL(0); // no sectors read
|
---|
| 465 | SET_CF(); // error occurred
|
---|
| 466 | return;
|
---|
| 467 | }
|
---|
| 468 |
|
---|
| 469 | // see if drive exists
|
---|
| 470 | if (floppy_drive_exists(drive) == 0) {
|
---|
| 471 | SET_AH(0x80); // not responding
|
---|
| 472 | set_diskette_ret_status(0x80);
|
---|
| 473 | SET_AL(0); // no sectors read
|
---|
| 474 | SET_CF(); // error occurred
|
---|
| 475 | return;
|
---|
| 476 | }
|
---|
| 477 |
|
---|
| 478 | // see if media in drive, and type is known
|
---|
| 479 | if (floppy_media_known(drive) == 0) {
|
---|
| 480 | if (floppy_media_sense(drive) == 0) {
|
---|
| 481 | SET_AH(0x0C); // Media type not found
|
---|
| 482 | set_diskette_ret_status(0x0C);
|
---|
| 483 | SET_AL(0); // no sectors read
|
---|
| 484 | SET_CF(); // error occurred
|
---|
| 485 | return;
|
---|
| 486 | }
|
---|
| 487 | }
|
---|
| 488 |
|
---|
| 489 | if (ah == 0x02) {
|
---|
| 490 | // Read Diskette Sectors
|
---|
| 491 |
|
---|
| 492 | //-----------------------------------
|
---|
| 493 | // set up DMA controller for transfer
|
---|
| 494 | //-----------------------------------
|
---|
| 495 |
|
---|
| 496 | // es:bx = pointer to where to place information from diskette
|
---|
| 497 | // port 04: DMA-1 base and current address, channel 2
|
---|
| 498 | // port 05: DMA-1 base and current count, channel 2
|
---|
| 499 | // @todo: merge/factor out pointer normalization
|
---|
| 500 | page = (ES >> 12); // upper 4 bits
|
---|
| 501 | base_es = (ES << 4); // lower 16bits contributed by ES
|
---|
| 502 | base_address = base_es + BX; // lower 16 bits of address
|
---|
| 503 | // contributed by ES:BX
|
---|
| 504 | if ( base_address < base_es ) {
|
---|
| 505 | // in case of carry, adjust page by 1
|
---|
| 506 | page++;
|
---|
| 507 | }
|
---|
| 508 | base_count = (num_sectors * 512) - 1;
|
---|
| 509 |
|
---|
| 510 | // check for 64K boundary overrun
|
---|
| 511 | last_addr = base_address + base_count;
|
---|
| 512 | if (last_addr < base_address) {
|
---|
| 513 | SET_AH(0x09);
|
---|
| 514 | set_diskette_ret_status(0x09);
|
---|
| 515 | SET_AL(0); // no sectors read
|
---|
| 516 | SET_CF(); // error occurred
|
---|
| 517 | return;
|
---|
| 518 | }
|
---|
| 519 |
|
---|
| 520 | BX_DEBUG_INT13_FL("masking DMA-1 c2\n");
|
---|
| 521 | outb(0x000a, 0x06);
|
---|
| 522 |
|
---|
| 523 | BX_DEBUG_INT13_FL("clear flip-flop\n");
|
---|
| 524 | outb(0x000c, 0x00); // clear flip-flop
|
---|
| 525 | outb(0x0004, base_address);
|
---|
| 526 | outb(0x0004, base_address>>8);
|
---|
| 527 | BX_DEBUG_INT13_FL("clear flip-flop\n");
|
---|
| 528 | outb(0x000c, 0x00); // clear flip-flop
|
---|
| 529 | outb(0x0005, base_count);
|
---|
| 530 | outb(0x0005, base_count>>8);
|
---|
| 531 | BX_DEBUG_INT13_FL("xfer buf at %x:%x\n", page, base_address);
|
---|
| 532 |
|
---|
| 533 | // port 0b: DMA-1 Mode Register
|
---|
| 534 | mode_register = 0x46; // single mode, increment, autoinit disable,
|
---|
| 535 | // transfer type=write, channel 2
|
---|
| 536 | BX_DEBUG_INT13_FL("setting mode register\n");
|
---|
| 537 | outb(0x000b, mode_register);
|
---|
| 538 |
|
---|
| 539 | BX_DEBUG_INT13_FL("setting page register\n");
|
---|
| 540 | // port 81: DMA-1 Page Register, channel 2
|
---|
| 541 | outb(0x0081, page);
|
---|
| 542 |
|
---|
| 543 | BX_DEBUG_INT13_FL("unmask chan 2\n");
|
---|
| 544 | outb(0x000a, 0x02); // unmask channel 2
|
---|
| 545 |
|
---|
| 546 | BX_DEBUG_INT13_FL("unmasking DMA-1 c2\n");
|
---|
| 547 | outb(0x000a, 0x02);
|
---|
| 548 |
|
---|
| 549 | //--------------------------------------
|
---|
| 550 | // set up floppy controller for transfer
|
---|
| 551 | //--------------------------------------
|
---|
| 552 | floppy_prepare_controller(drive);
|
---|
| 553 |
|
---|
| 554 | // send read-normal-data command (9 bytes) to controller
|
---|
| 555 | outb(0x03f5, 0xe6); // e6: read normal data
|
---|
| 556 | outb(0x03f5, (head << 2) | drive); // HD DR1 DR2
|
---|
| 557 | outb(0x03f5, track);
|
---|
| 558 | outb(0x03f5, head);
|
---|
| 559 | outb(0x03f5, sector);
|
---|
| 560 | outb(0x03f5, 2); // 512 byte sector size
|
---|
| 561 | outb(0x03f5, sector + num_sectors - 1); // last sector to read on track
|
---|
| 562 | outb(0x03f5, 0); // Gap length
|
---|
| 563 | outb(0x03f5, 0xff); // Gap length
|
---|
| 564 |
|
---|
| 565 | // turn on interrupts
|
---|
| 566 | int_enable();
|
---|
| 567 |
|
---|
| 568 | // wait on 40:3e bit 7 to become 1
|
---|
| 569 | do {
|
---|
| 570 | val8 = read_byte(0x0040, 0x0040);
|
---|
| 571 | if (val8 == 0) {
|
---|
| 572 | floppy_reset_controller();
|
---|
| 573 | SET_AH(0x80); // drive not ready (timeout)
|
---|
| 574 | set_diskette_ret_status(0x80);
|
---|
| 575 | SET_AL(0); // no sectors read
|
---|
| 576 | SET_CF(); // error occurred
|
---|
| 577 | return;
|
---|
| 578 | }
|
---|
| 579 | val8 = (read_byte(0x0040, 0x003e) & 0x80);
|
---|
| 580 | } while ( val8 == 0 );
|
---|
| 581 |
|
---|
| 582 | val8 = 0; // separate asm from while() loop
|
---|
| 583 | // turn off interrupts
|
---|
| 584 | int_disable();
|
---|
| 585 |
|
---|
| 586 | // set 40:3e bit 7 to 0
|
---|
| 587 | val8 = read_byte(0x0040, 0x003e);
|
---|
| 588 | val8 &= 0x7f;
|
---|
| 589 | write_byte(0x0040, 0x003e, val8);
|
---|
| 590 |
|
---|
| 591 | // check port 3f4 for accessibility to status bytes
|
---|
| 592 | val8 = inb(0x3f4);
|
---|
| 593 | if ( (val8 & 0xc0) != 0xc0 )
|
---|
| 594 | BX_PANIC("%s: ctrl not ready\n", __func__);
|
---|
| 595 |
|
---|
| 596 | // read 7 return status bytes from controller and store in BDA
|
---|
| 597 | for (i = 0; i < 7; ++i) {
|
---|
| 598 | return_status[i] = inb(0x3f5);
|
---|
| 599 | write_byte(0x0040, 0x0042 + i, return_status[i]);
|
---|
| 600 | }
|
---|
| 601 |
|
---|
| 602 | if ( (return_status[0] & 0xc0) != 0 ) {
|
---|
| 603 | SET_AH(0x20);
|
---|
| 604 | set_diskette_ret_status(0x20);
|
---|
| 605 | SET_AL(0); // no sectors read
|
---|
| 606 | SET_CF(); // error occurred
|
---|
| 607 | return;
|
---|
| 608 | }
|
---|
[38997] | 609 |
|
---|
| 610 | #ifdef DMA_WORKAROUND
|
---|
| 611 | rep_movsw(ES :> BX, ES :> BX, num_sectors * 512 / 2);
|
---|
| 612 | #endif
|
---|
[38699] | 613 | // ??? should track be new val from return_status[3] ?
|
---|
| 614 | set_diskette_current_cyl(drive, track);
|
---|
| 615 | // AL = number of sectors read (same value as passed)
|
---|
| 616 | SET_AH(0x00); // success
|
---|
| 617 | CLEAR_CF(); // success
|
---|
| 618 | return;
|
---|
| 619 | } else if (ah == 0x03) {
|
---|
| 620 | // Write Diskette Sectors
|
---|
| 621 |
|
---|
| 622 | //-----------------------------------
|
---|
| 623 | // set up DMA controller for transfer
|
---|
| 624 | //-----------------------------------
|
---|
| 625 |
|
---|
| 626 | // es:bx = pointer to where to place information from diskette
|
---|
| 627 | // port 04: DMA-1 base and current address, channel 2
|
---|
| 628 | // port 05: DMA-1 base and current count, channel 2
|
---|
| 629 | // @todo: merge/factor out pointer normalization
|
---|
| 630 | page = (ES >> 12); // upper 4 bits
|
---|
| 631 | base_es = (ES << 4); // lower 16bits contributed by ES
|
---|
| 632 | base_address = base_es + BX; // lower 16 bits of address
|
---|
| 633 | // contributed by ES:BX
|
---|
| 634 | if ( base_address < base_es ) {
|
---|
| 635 | // in case of carry, adjust page by 1
|
---|
| 636 | page++;
|
---|
| 637 | }
|
---|
| 638 | base_count = (num_sectors * 512) - 1;
|
---|
| 639 |
|
---|
| 640 | // check for 64K boundary overrun
|
---|
| 641 | last_addr = base_address + base_count;
|
---|
| 642 | if (last_addr < base_address) {
|
---|
| 643 | SET_AH(0x09);
|
---|
| 644 | set_diskette_ret_status(0x09);
|
---|
| 645 | SET_AL(0); // no sectors read
|
---|
| 646 | SET_CF(); // error occurred
|
---|
| 647 | return;
|
---|
| 648 | }
|
---|
| 649 |
|
---|
| 650 | BX_DEBUG_INT13_FL("masking DMA-1 c2\n");
|
---|
| 651 | outb(0x000a, 0x06);
|
---|
| 652 |
|
---|
| 653 | outb(0x000c, 0x00); // clear flip-flop
|
---|
| 654 | outb(0x0004, base_address);
|
---|
| 655 | outb(0x0004, base_address>>8);
|
---|
| 656 | outb(0x000c, 0x00); // clear flip-flop
|
---|
| 657 | outb(0x0005, base_count);
|
---|
| 658 | outb(0x0005, base_count>>8);
|
---|
| 659 | BX_DEBUG_INT13_FL("xfer buf at %x:%x\n", page, base_address);
|
---|
| 660 |
|
---|
| 661 | // port 0b: DMA-1 Mode Register
|
---|
| 662 | mode_register = 0x4a; // single mode, increment, autoinit disable,
|
---|
| 663 | // transfer type=read, channel 2
|
---|
| 664 | outb(0x000b, mode_register);
|
---|
| 665 |
|
---|
| 666 | // port 81: DMA-1 Page Register, channel 2
|
---|
| 667 | outb(0x0081, page);
|
---|
| 668 |
|
---|
| 669 | BX_DEBUG_INT13_FL("unmasking DMA-1 c2\n");
|
---|
| 670 | outb(0x000a, 0x02);
|
---|
| 671 |
|
---|
| 672 | //--------------------------------------
|
---|
| 673 | // set up floppy controller for transfer
|
---|
| 674 | //--------------------------------------
|
---|
| 675 | floppy_prepare_controller(drive);
|
---|
| 676 |
|
---|
| 677 | // send write-normal-data command (9 bytes) to controller
|
---|
| 678 | outb(0x03f5, 0xc5); // c5: write normal data
|
---|
| 679 | outb(0x03f5, (head << 2) | drive); // HD DR1 DR2
|
---|
| 680 | outb(0x03f5, track);
|
---|
| 681 | outb(0x03f5, head);
|
---|
| 682 | outb(0x03f5, sector);
|
---|
| 683 | outb(0x03f5, 2); // 512 byte sector size
|
---|
| 684 | outb(0x03f5, sector + num_sectors - 1); // last sector to write on track
|
---|
| 685 | outb(0x03f5, 0); // Gap length
|
---|
| 686 | outb(0x03f5, 0xff); // Gap length
|
---|
| 687 |
|
---|
| 688 | // turn on interrupts
|
---|
| 689 | int_enable();
|
---|
| 690 |
|
---|
| 691 | // wait on 40:3e bit 7 to become 1
|
---|
| 692 | do {
|
---|
| 693 | val8 = read_byte(0x0040, 0x0040);
|
---|
| 694 | if (val8 == 0) {
|
---|
| 695 | floppy_reset_controller();
|
---|
| 696 | SET_AH(0x80); // drive not ready (timeout)
|
---|
| 697 | set_diskette_ret_status(0x80);
|
---|
| 698 | SET_AL(0); // no sectors written
|
---|
| 699 | SET_CF(); // error occurred
|
---|
| 700 | return;
|
---|
| 701 | }
|
---|
| 702 | val8 = (read_byte(0x0040, 0x003e) & 0x80);
|
---|
| 703 | } while ( val8 == 0 );
|
---|
| 704 |
|
---|
| 705 | val8 = 0; // separate asm from while() loop @todo: why??
|
---|
| 706 | // turn off interrupts
|
---|
| 707 | int_disable();
|
---|
| 708 |
|
---|
| 709 | // set 40:3e bit 7 to 0
|
---|
| 710 | val8 = read_byte(0x0040, 0x003e);
|
---|
| 711 | val8 &= 0x7f;
|
---|
| 712 | write_byte(0x0040, 0x003e, val8);
|
---|
| 713 |
|
---|
| 714 | // check port 3f4 for accessibility to status bytes
|
---|
| 715 | val8 = inb(0x3f4);
|
---|
| 716 | if ( (val8 & 0xc0) != 0xc0 )
|
---|
| 717 | BX_PANIC("%s: ctrl not ready\n", __func__);
|
---|
| 718 |
|
---|
| 719 | // read 7 return status bytes from controller and store in BDA
|
---|
| 720 | for (i = 0; i < 7; ++i) {
|
---|
| 721 | return_status[i] = inb(0x3f5);
|
---|
| 722 | write_byte(0x0040, 0x0042 + i, return_status[i]);
|
---|
| 723 | }
|
---|
| 724 |
|
---|
| 725 | if ( (return_status[0] & 0xc0) != 0 ) {
|
---|
| 726 | if ( (return_status[1] & 0x02) != 0 ) {
|
---|
| 727 | // diskette not writable.
|
---|
| 728 | // AH=status code=0x03 (tried to write on write-protected disk)
|
---|
| 729 | // AL=number of sectors written=0
|
---|
| 730 | AX = 0x0300;
|
---|
| 731 | SET_CF();
|
---|
| 732 | return;
|
---|
| 733 | } else {
|
---|
| 734 | BX_PANIC("%s: read error\n", __func__);
|
---|
| 735 | }
|
---|
| 736 | }
|
---|
| 737 |
|
---|
| 738 | // ??? should track be new val from return_status[3] ?
|
---|
| 739 | set_diskette_current_cyl(drive, track);
|
---|
| 740 | // AL = number of sectors read (same value as passed)
|
---|
| 741 | SET_AH(0x00); // success
|
---|
| 742 | CLEAR_CF(); // success
|
---|
| 743 | return;
|
---|
| 744 | } else { // if (ah == 0x04)
|
---|
| 745 | // Verify Diskette Sectors
|
---|
| 746 |
|
---|
| 747 | // ??? should track be new val from return_status[3] ?
|
---|
| 748 | set_diskette_current_cyl(drive, track);
|
---|
| 749 | // AL = number of sectors verified (same value as passed)
|
---|
| 750 | CLEAR_CF(); // success
|
---|
| 751 | SET_AH(0x00); // success
|
---|
| 752 | return;
|
---|
| 753 | }
|
---|
| 754 | break;
|
---|
| 755 |
|
---|
| 756 | case 0x05: // format diskette track
|
---|
| 757 | BX_DEBUG_INT13_FL("floppy f05\n");
|
---|
| 758 |
|
---|
| 759 | num_sectors = GET_AL();
|
---|
| 760 | track = GET_CH();
|
---|
| 761 | head = GET_DH();
|
---|
| 762 | drive = GET_ELDL();
|
---|
| 763 |
|
---|
| 764 | if ((drive > 1) || (head > 1) || (track > 79) ||
|
---|
| 765 | (num_sectors == 0) || (num_sectors > 18)) {
|
---|
| 766 | SET_AH(1);
|
---|
| 767 | set_diskette_ret_status(1);
|
---|
| 768 | SET_CF(); // error occurred
|
---|
| 769 | }
|
---|
| 770 |
|
---|
| 771 | // see if drive exists
|
---|
| 772 | if (floppy_drive_exists(drive) == 0) {
|
---|
| 773 | SET_AH(0x80); // drive not responding
|
---|
| 774 | set_diskette_ret_status(0x80);
|
---|
| 775 | SET_CF(); // error occurred
|
---|
| 776 | return;
|
---|
| 777 | }
|
---|
| 778 |
|
---|
| 779 | // see if media in drive, and type is known
|
---|
| 780 | if (floppy_media_known(drive) == 0) {
|
---|
| 781 | if (floppy_media_sense(drive) == 0) {
|
---|
| 782 | SET_AH(0x0C); // Media type not found
|
---|
| 783 | set_diskette_ret_status(0x0C);
|
---|
| 784 | SET_AL(0); // no sectors read
|
---|
| 785 | SET_CF(); // error occurred
|
---|
| 786 | return;
|
---|
| 787 | }
|
---|
| 788 | }
|
---|
| 789 |
|
---|
| 790 | // set up DMA controller for transfer
|
---|
| 791 | // @todo: merge/factor out pointer normalization
|
---|
| 792 | page = (ES >> 12); // upper 4 bits
|
---|
| 793 | base_es = (ES << 4); // lower 16bits contributed by ES
|
---|
| 794 | base_address = base_es + BX; // lower 16 bits of address
|
---|
| 795 | // contributed by ES:BX
|
---|
| 796 | if ( base_address < base_es ) {
|
---|
| 797 | // in case of carry, adjust page by 1
|
---|
| 798 | page++;
|
---|
| 799 | }
|
---|
| 800 | base_count = (num_sectors * 4) - 1;
|
---|
| 801 |
|
---|
| 802 | // check for 64K boundary overrun
|
---|
| 803 | last_addr = base_address + base_count;
|
---|
| 804 | if (last_addr < base_address) {
|
---|
| 805 | SET_AH(0x09);
|
---|
| 806 | set_diskette_ret_status(0x09);
|
---|
| 807 | SET_AL(0); // no sectors read
|
---|
| 808 | SET_CF(); // error occurred
|
---|
| 809 | return;
|
---|
| 810 | }
|
---|
| 811 |
|
---|
| 812 | outb(0x000a, 0x06);
|
---|
| 813 | outb(0x000c, 0x00); // clear flip-flop
|
---|
| 814 | outb(0x0004, base_address);
|
---|
| 815 | outb(0x0004, base_address>>8);
|
---|
| 816 | outb(0x000c, 0x00); // clear flip-flop
|
---|
| 817 | outb(0x0005, base_count);
|
---|
| 818 | outb(0x0005, base_count>>8);
|
---|
| 819 | mode_register = 0x4a; // single mode, increment, autoinit disable,
|
---|
| 820 | // transfer type=read, channel 2
|
---|
| 821 | outb(0x000b, mode_register);
|
---|
| 822 | // port 81: DMA-1 Page Register, channel 2
|
---|
| 823 | outb(0x0081, page);
|
---|
| 824 | outb(0x000a, 0x02);
|
---|
| 825 |
|
---|
| 826 | // set up floppy controller for transfer
|
---|
| 827 | floppy_prepare_controller(drive);
|
---|
| 828 |
|
---|
| 829 | // send format-track command (6 bytes) to controller
|
---|
| 830 | outb(0x03f5, 0x4d); // 4d: format track
|
---|
| 831 | outb(0x03f5, (head << 2) | drive); // HD DR1 DR2
|
---|
| 832 | outb(0x03f5, 2); // 512 byte sector size
|
---|
| 833 | outb(0x03f5, num_sectors); // number of sectors per track
|
---|
| 834 | outb(0x03f5, 0); // Gap length
|
---|
| 835 | outb(0x03f5, 0xf6); // Fill byte
|
---|
| 836 | // turn on interrupts
|
---|
| 837 | int_enable();
|
---|
| 838 |
|
---|
| 839 | // wait on 40:3e bit 7 to become 1
|
---|
| 840 | do {
|
---|
| 841 | val8 = read_byte(0x0040, 0x0040);
|
---|
| 842 | if (val8 == 0) {
|
---|
| 843 | floppy_reset_controller();
|
---|
| 844 | SET_AH(0x80); // drive not ready (timeout)
|
---|
| 845 | set_diskette_ret_status(0x80);
|
---|
| 846 | SET_CF(); // error occurred
|
---|
| 847 | return;
|
---|
| 848 | }
|
---|
| 849 | val8 = (read_byte(0x0040, 0x003e) & 0x80);
|
---|
| 850 | } while ( val8 == 0 );
|
---|
| 851 |
|
---|
| 852 | val8 = 0; // separate asm from while() loop
|
---|
| 853 | // turn off interrupts
|
---|
| 854 | int_disable();
|
---|
| 855 | // set 40:3e bit 7 to 0
|
---|
| 856 | val8 = read_byte(0x0040, 0x003e);
|
---|
| 857 | val8 &= 0x7f;
|
---|
| 858 | write_byte(0x0040, 0x003e, val8);
|
---|
| 859 | // check port 3f4 for accessibility to status bytes
|
---|
| 860 | val8 = inb(0x3f4);
|
---|
| 861 | if ( (val8 & 0xc0) != 0xc0 )
|
---|
| 862 | BX_PANIC("%s: ctrl not ready\n", __func__);
|
---|
| 863 |
|
---|
| 864 | // read 7 return status bytes from controller and store in BDA
|
---|
| 865 | for (i = 0; i < 7; ++i) {
|
---|
| 866 | return_status[i] = inb(0x3f5);
|
---|
| 867 | write_byte(0x0040, 0x0042 + i, return_status[i]);
|
---|
| 868 | }
|
---|
| 869 |
|
---|
| 870 | if ( (return_status[0] & 0xc0) != 0 ) {
|
---|
| 871 | if ( (return_status[1] & 0x02) != 0 ) {
|
---|
| 872 | // diskette not writable.
|
---|
| 873 | // AH=status code=0x03 (tried to write on write-protected disk)
|
---|
| 874 | // AL=number of sectors written=0
|
---|
| 875 | AX = 0x0300;
|
---|
| 876 | SET_CF();
|
---|
| 877 | return;
|
---|
| 878 | } else {
|
---|
| 879 | BX_PANIC("%s: write error\n", __func__);
|
---|
| 880 | }
|
---|
| 881 | }
|
---|
| 882 |
|
---|
| 883 | SET_AH(0);
|
---|
| 884 | set_diskette_ret_status(0);
|
---|
| 885 | set_diskette_current_cyl(drive, 0);
|
---|
| 886 | CLEAR_CF(); // successful
|
---|
| 887 | return;
|
---|
| 888 |
|
---|
| 889 |
|
---|
| 890 | case 0x08: // read diskette drive parameters
|
---|
| 891 | BX_DEBUG_INT13_FL("floppy f08\n");
|
---|
| 892 | drive = GET_ELDL();
|
---|
| 893 |
|
---|
| 894 | if (drive > 1) {
|
---|
| 895 | AX = 0;
|
---|
| 896 | BX = 0;
|
---|
| 897 | CX = 0;
|
---|
| 898 | DX = 0;
|
---|
| 899 | ES = 0;
|
---|
| 900 | DI = 0;
|
---|
| 901 | SET_DL(num_floppies);
|
---|
| 902 | SET_CF();
|
---|
| 903 | return;
|
---|
| 904 | }
|
---|
| 905 |
|
---|
| 906 | // @todo: break out drive type determination
|
---|
| 907 | drive_type = inb_cmos(0x10);
|
---|
| 908 | num_floppies = 0;
|
---|
| 909 | if (drive_type & 0xf0)
|
---|
| 910 | num_floppies++;
|
---|
| 911 | if (drive_type & 0x0f)
|
---|
| 912 | num_floppies++;
|
---|
| 913 |
|
---|
| 914 | if (drive == 0)
|
---|
| 915 | drive_type >>= 4;
|
---|
| 916 | else
|
---|
| 917 | drive_type &= 0x0f;
|
---|
| 918 |
|
---|
| 919 | SET_BH(0);
|
---|
| 920 | SET_BL(drive_type);
|
---|
| 921 | SET_AH(0);
|
---|
| 922 | SET_AL(0);
|
---|
| 923 | SET_DL(num_floppies);
|
---|
| 924 |
|
---|
| 925 | switch (drive_type) {
|
---|
| 926 | case 0: // none
|
---|
| 927 | CX = 0;
|
---|
| 928 | SET_DH(0); // max head #
|
---|
| 929 | break;
|
---|
| 930 |
|
---|
| 931 | case 1: // 360KB, 5.25"
|
---|
| 932 | CX = 0x2709; // 40 tracks, 9 sectors
|
---|
| 933 | SET_DH(1); // max head #
|
---|
| 934 | break;
|
---|
| 935 |
|
---|
| 936 | case 2: // 1.2MB, 5.25"
|
---|
| 937 | CX = 0x4f0f; // 80 tracks, 15 sectors
|
---|
| 938 | SET_DH(1); // max head #
|
---|
| 939 | break;
|
---|
| 940 |
|
---|
| 941 | case 3: // 720KB, 3.5"
|
---|
| 942 | CX = 0x4f09; // 80 tracks, 9 sectors
|
---|
| 943 | SET_DH(1); // max head #
|
---|
| 944 | break;
|
---|
| 945 |
|
---|
| 946 | case 4: // 1.44MB, 3.5"
|
---|
| 947 | CX = 0x4f12; // 80 tracks, 18 sectors
|
---|
| 948 | SET_DH(1); // max head #
|
---|
| 949 | break;
|
---|
| 950 |
|
---|
| 951 | case 5: // 2.88MB, 3.5"
|
---|
| 952 | CX = 0x4f24; // 80 tracks, 36 sectors
|
---|
| 953 | SET_DH(1); // max head #
|
---|
| 954 | break;
|
---|
| 955 |
|
---|
| 956 | case 6: // 160k, 5.25"
|
---|
| 957 | CX = 0x2708; // 40 tracks, 8 sectors
|
---|
| 958 | SET_DH(0); // max head #
|
---|
| 959 | break;
|
---|
| 960 |
|
---|
| 961 | case 7: // 180k, 5.25"
|
---|
| 962 | CX = 0x2709; // 40 tracks, 9 sectors
|
---|
| 963 | SET_DH(0); // max head #
|
---|
| 964 | break;
|
---|
| 965 |
|
---|
| 966 | case 8: // 320k, 5.25"
|
---|
| 967 | CX = 0x2708; // 40 tracks, 8 sectors
|
---|
| 968 | SET_DH(1); // max head #
|
---|
| 969 | break;
|
---|
| 970 |
|
---|
| 971 | default: // ?
|
---|
| 972 | BX_PANIC("%s: bad floppy type\n", __func__);
|
---|
| 973 | }
|
---|
| 974 |
|
---|
| 975 | /* set es & di to point to 11 byte diskette param table in ROM */
|
---|
| 976 | ES = 0xF000; // @todo: any way to make this relocatable?
|
---|
| 977 | DI = (uint16_t)&diskette_param_table;
|
---|
| 978 | CLEAR_CF(); // success
|
---|
| 979 | /* disk status not changed upon success */
|
---|
| 980 | return;
|
---|
| 981 |
|
---|
| 982 | case 0x15: // read diskette drive type
|
---|
| 983 | BX_DEBUG_INT13_FL("floppy f15\n");
|
---|
| 984 | drive = GET_ELDL();
|
---|
| 985 | if (drive > 1) {
|
---|
| 986 | SET_AH(0); // only 2 drives supported
|
---|
| 987 | // set_diskette_ret_status here ???
|
---|
| 988 | SET_CF();
|
---|
| 989 | return;
|
---|
| 990 | }
|
---|
| 991 | // @todo: break out drive type determination
|
---|
| 992 | drive_type = inb_cmos(0x10);
|
---|
| 993 | if (drive == 0)
|
---|
| 994 | drive_type >>= 4;
|
---|
| 995 | else
|
---|
| 996 | drive_type &= 0x0f;
|
---|
| 997 | CLEAR_CF(); // successful, not present
|
---|
| 998 | if (drive_type==0) {
|
---|
| 999 | SET_AH(0); // drive not present
|
---|
| 1000 | }
|
---|
| 1001 | else {
|
---|
| 1002 | SET_AH(1); // drive present, does not support change line
|
---|
| 1003 | }
|
---|
| 1004 |
|
---|
| 1005 | return;
|
---|
| 1006 |
|
---|
| 1007 | case 0x16: // get diskette change line status
|
---|
| 1008 | BX_DEBUG_INT13_FL("floppy f16\n");
|
---|
| 1009 | drive = GET_ELDL();
|
---|
| 1010 | if (drive > 1) {
|
---|
| 1011 | SET_AH(0x01); // invalid drive
|
---|
| 1012 | set_diskette_ret_status(0x01);
|
---|
| 1013 | SET_CF();
|
---|
| 1014 | return;
|
---|
| 1015 | }
|
---|
| 1016 |
|
---|
| 1017 | SET_AH(0x06); // change line not supported
|
---|
| 1018 | set_diskette_ret_status(0x06);
|
---|
| 1019 | SET_CF();
|
---|
| 1020 | return;
|
---|
| 1021 |
|
---|
| 1022 | case 0x17: // set diskette type for format(old)
|
---|
| 1023 | BX_DEBUG_INT13_FL("floppy f17\n");
|
---|
| 1024 | /* not used for 1.44M floppies */
|
---|
| 1025 | SET_AH(0x01); // not supported
|
---|
| 1026 | set_diskette_ret_status(1); /* not supported */
|
---|
| 1027 | SET_CF();
|
---|
| 1028 | return;
|
---|
| 1029 |
|
---|
| 1030 | case 0x18: // set diskette type for format(new)
|
---|
| 1031 | BX_DEBUG_INT13_FL("floppy f18\n");
|
---|
| 1032 | SET_AH(0x01); // do later
|
---|
| 1033 | set_diskette_ret_status(1);
|
---|
| 1034 | SET_CF();
|
---|
| 1035 | return;
|
---|
| 1036 |
|
---|
| 1037 | default:
|
---|
| 1038 | BX_INFO("%s: unsupported AH=%02x\n", __func__, GET_AH());
|
---|
| 1039 |
|
---|
| 1040 | // if ( (ah==0x20) || ((ah>=0x41) && (ah<=0x49)) || (ah==0x4e) ) {
|
---|
| 1041 | SET_AH(0x01); // ???
|
---|
| 1042 | set_diskette_ret_status(1);
|
---|
| 1043 | SET_CF();
|
---|
| 1044 | return;
|
---|
| 1045 | // }
|
---|
| 1046 | }
|
---|
| 1047 | }
|
---|
| 1048 |
|
---|
| 1049 | #else // #if BX_SUPPORT_FLOPPY
|
---|
| 1050 |
|
---|
| 1051 | void BIOSCALL int13_diskette_function(disk_regs_t r)
|
---|
| 1052 | {
|
---|
| 1053 | uint8_t val8;
|
---|
| 1054 |
|
---|
| 1055 | switch ( GET_AH() ) {
|
---|
| 1056 |
|
---|
| 1057 | case 0x01: // Read Diskette Status
|
---|
| 1058 | CLEAR_CF();
|
---|
| 1059 | val8 = read_byte(0x0000, 0x0441);
|
---|
| 1060 | SET_AH(val8);
|
---|
| 1061 | if (val8) {
|
---|
| 1062 | SET_CF();
|
---|
| 1063 | }
|
---|
| 1064 | return;
|
---|
| 1065 |
|
---|
| 1066 | default:
|
---|
| 1067 | SET_CF();
|
---|
| 1068 | write_byte(0x0000, 0x0441, 0x01);
|
---|
| 1069 | SET_AH(0x01);
|
---|
| 1070 | }
|
---|
| 1071 | }
|
---|
| 1072 |
|
---|
| 1073 | #endif // #if BX_SUPPORT_FLOPPY
|
---|
| 1074 |
|
---|
| 1075 | #if 0
|
---|
| 1076 | void determine_floppy_media(uint16_t drive)
|
---|
| 1077 | {
|
---|
| 1078 | uint8_t val8, DOR, ctrl_info;
|
---|
| 1079 |
|
---|
| 1080 | ctrl_info = read_byte(0x0040, 0x008F);
|
---|
| 1081 | if (drive==1)
|
---|
| 1082 | ctrl_info >>= 4;
|
---|
| 1083 | else
|
---|
| 1084 | ctrl_info &= 0x0f;
|
---|
| 1085 |
|
---|
| 1086 | #if 0
|
---|
| 1087 | if (drive == 0) {
|
---|
| 1088 | DOR = 0x1c; // DOR: drive0 motor on, DMA&int enabled, normal op, drive select 0
|
---|
| 1089 | }
|
---|
| 1090 | else {
|
---|
| 1091 | DOR = 0x2d; // DOR: drive1 motor on, DMA&int enabled, normal op, drive select 1
|
---|
| 1092 | }
|
---|
| 1093 | #endif
|
---|
| 1094 |
|
---|
| 1095 | if ( (ctrl_info & 0x04) != 0x04 ) {
|
---|
| 1096 | // Drive not determined means no drive exists, done.
|
---|
| 1097 | return;
|
---|
| 1098 | }
|
---|
| 1099 |
|
---|
| 1100 | #if 0
|
---|
| 1101 | // check Main Status Register for readiness
|
---|
| 1102 | val8 = inb(0x03f4) & 0x80; // Main Status Register
|
---|
| 1103 | if (val8 != 0x80)
|
---|
| 1104 | BX_PANIC("d_f_m: MRQ bit not set\n");
|
---|
| 1105 |
|
---|
| 1106 | // change line
|
---|
| 1107 |
|
---|
| 1108 | // existing BDA values
|
---|
| 1109 |
|
---|
| 1110 | // turn on drive motor
|
---|
| 1111 | outb(0x03f2, DOR); // Digital Output Register
|
---|
| 1112 | //
|
---|
| 1113 | #endif
|
---|
| 1114 | BX_PANIC("d_f_m: OK so far\n");
|
---|
| 1115 | }
|
---|
| 1116 | #endif
|
---|
| 1117 |
|
---|