[102] | 1 | ; Project name : XTIDE Universal BIOS |
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[3] | 2 | ; Description : Various floppy drive related functions that |
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| 3 | ; Boot Menu uses. |
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| 4 | |
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[376] | 5 | ; |
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[526] | 6 | ; XTIDE Universal BIOS and Associated Tools |
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| 7 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team. |
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[376] | 8 | ; |
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| 9 | ; This program is free software; you can redistribute it and/or modify |
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| 10 | ; it under the terms of the GNU General Public License as published by |
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| 11 | ; the Free Software Foundation; either version 2 of the License, or |
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| 12 | ; (at your option) any later version. |
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[526] | 13 | ; |
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[376] | 14 | ; This program is distributed in the hope that it will be useful, |
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| 15 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 16 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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[526] | 17 | ; GNU General Public License for more details. |
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[376] | 18 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html |
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[526] | 19 | ; |
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[376] | 20 | |
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[3] | 21 | ; Section containing code |
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| 22 | SECTION .text |
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| 23 | |
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| 24 | ;-------------------------------------------------------------------- |
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| 25 | ; Checks is floppy drive handler installed to interrupt vector 40h. |
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| 26 | ; |
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| 27 | ; FloppyDrive_IsInt40hInstalled |
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| 28 | ; Parameters: |
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| 29 | ; ES: BDA and Interrupt Vector segment (zero) |
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| 30 | ; Returns: |
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| 31 | ; CF: Set if INT 40h is installed |
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| 32 | ; Cleared if INT 40h is not installed |
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| 33 | ; Corrupts registers: |
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| 34 | ; BX, CX, DI |
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[86] | 35 | ;-------------------------------------------------------------------- |
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[3] | 36 | FloppyDrive_IsInt40hInstalled: |
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[99] | 37 | %ifdef USE_AT |
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[39] | 38 | push es |
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| 39 | push dx |
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| 40 | push ax |
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[3] | 41 | |
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[530] | 42 | call LoadInt40hVerifyParameters |
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[152] | 43 | int BIOS_DISK_INTERRUPT_13h |
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[99] | 44 | jc SHORT .Int40hIsInstalled ; Maybe there are not any floppy drives at all |
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[530] | 45 | push es ; Drive Parameter Table segment |
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| 46 | push di ; Drive Parameter Table offset |
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[39] | 47 | |
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[530] | 48 | call LoadInt40hVerifyParameters |
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[152] | 49 | int BIOS_DISKETTE_INTERRUPT_40h |
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[39] | 50 | |
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| 51 | pop dx |
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| 52 | pop cx |
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| 53 | cmp dx, di ; Difference in offsets? |
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| 54 | jne SHORT .Int40hNotInstalled |
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| 55 | mov dx, es |
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| 56 | cmp cx, dx ; Difference in segments? |
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[99] | 57 | je SHORT .Int40hIsInstalled |
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[39] | 58 | .Int40hNotInstalled: |
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| 59 | stc |
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| 60 | .Int40hIsInstalled: |
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| 61 | pop ax |
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| 62 | pop dx |
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| 63 | pop es |
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[530] | 64 | |
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| 65 | %else ; if XT build |
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[531] | 66 | cmp BYTE [es:BIOS_DISKETTE_INTERRUPT_40h*4+3], 0C0h ; Any ROM segment? (set CF if not) |
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[530] | 67 | %endif ; USE_AT |
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| 68 | cmc |
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[39] | 69 | ret |
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| 70 | |
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[3] | 71 | ;-------------------------------------------------------------------- |
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[530] | 72 | ; LoadInt40hVerifyParameters |
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[39] | 73 | ; Parameters: |
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| 74 | ; Nothing |
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| 75 | ; Returns: |
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| 76 | ; AH: 08h (Get Drive Parameters) |
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| 77 | ; DL: 00h (floppy drive) |
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| 78 | ; ES:DI: 0:0h (to guard against BIOS bugs) |
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| 79 | ; Corrupts registers: |
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| 80 | ; DH |
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[86] | 81 | ;-------------------------------------------------------------------- |
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[530] | 82 | %ifdef USE_AT |
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| 83 | LoadInt40hVerifyParameters: |
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| 84 | mov ah, GET_DRIVE_PARAMETERS |
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| 85 | cwd ; Floppy drive 0 |
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[39] | 86 | mov di, dx |
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[530] | 87 | mov es, dx ; ES:DI = 0000:0000h to guard against BIOS bugs |
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[39] | 88 | ret |
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[99] | 89 | %endif |
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[39] | 90 | |
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| 91 | |
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| 92 | ;-------------------------------------------------------------------- |
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[3] | 93 | ; Returns floppy drive type. |
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| 94 | ; PC/XT system do not support AH=08h but FLOPPY_TYPE_525_OR_35_DD |
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| 95 | ; is still returned for them. |
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| 96 | ; |
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| 97 | ; FloppyDrive_GetType |
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| 98 | ; Parameters: |
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| 99 | ; DL: Floppy Drive number |
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| 100 | ; Returns: |
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| 101 | ; BX: Floppy Drive Type: |
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| 102 | ; FLOPPY_TYPE_525_OR_35_DD |
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| 103 | ; FLOPPY_TYPE_525_DD |
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| 104 | ; FLOPPY_TYPE_525_HD |
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| 105 | ; FLOPPY_TYPE_35_DD |
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| 106 | ; FLOPPY_TYPE_35_HD |
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| 107 | ; FLOPPY_TYPE_35_ED |
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| 108 | ; CF: Set if AH=08h not supported (XT systems) or error |
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| 109 | ; Cleared if type read correctly (AT systems) |
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| 110 | ; Corrupts registers: |
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| 111 | ; AX, CX, DX, DI, ES |
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| 112 | ;-------------------------------------------------------------------- |
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[392] | 113 | %ifdef MODULE_BOOT_MENU |
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[3] | 114 | FloppyDrive_GetType: |
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[530] | 115 | mov ah, GET_DRIVE_PARAMETERS |
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[3] | 116 | xor bx, bx ; FLOPPY_TYPE_525_OR_35_DD when function not supported |
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[152] | 117 | int BIOS_DISKETTE_INTERRUPT_40h |
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[3] | 118 | ret |
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[392] | 119 | %endif |
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[3] | 120 | |
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| 121 | |
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| 122 | ;-------------------------------------------------------------------- |
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| 123 | ; Returns number of Floppy Drives in system. |
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| 124 | ; |
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[258] | 125 | ; FloppyDrive_GetCountToAX |
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[3] | 126 | ; Parameters: |
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[258] | 127 | ; DS: RAMVARS Segment |
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[3] | 128 | ; Returns: |
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[258] | 129 | ; AX: Number of Floppy Drives |
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[3] | 130 | ;-------------------------------------------------------------------- |
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[294] | 131 | FloppyDrive_GetCountToAX: |
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[258] | 132 | %ifdef MODULE_SERIAL_FLOPPY |
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| 133 | call RamVars_UnpackFlopCntAndFirstToAL |
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[270] | 134 | js .UseBIOSorBDA ; We didn't add in any drives, counts here are not valid |
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[294] | 135 | |
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[531] | 136 | adc al, 1 ; adds in the drive count bit, and adds 1 for count vs. 0-index, |
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[270] | 137 | jmp .FinishCalc ; need to clear AH on the way out, and add in minimum drive numbers |
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[258] | 138 | |
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[294] | 139 | .UseBIOSorBDA: |
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[99] | 140 | %endif |
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[258] | 141 | call FloppyDrive_GetCountFromBIOS_or_BDA |
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[270] | 142 | |
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[294] | 143 | .FinishCalc: |
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[258] | 144 | mov ah, [cs:ROMVARS.bMinFddCnt] |
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| 145 | MAX_U al, ah |
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| 146 | cbw |
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[294] | 147 | |
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[3] | 148 | ret |
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| 149 | |
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| 150 | |
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| 151 | ;-------------------------------------------------------------------- |
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[530] | 152 | ; FloppyDrive_GetCountFromBIOS_or_BDA |
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[3] | 153 | ; Parameters: |
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| 154 | ; Nothing |
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| 155 | ; Returns: |
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[274] | 156 | ; AL: Number of Floppy Drives |
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[294] | 157 | ; CF: Cleared if successful |
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[3] | 158 | ; Set if BIOS function not supported |
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| 159 | ; Corrupts registers: |
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[547] | 160 | ; AH |
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[3] | 161 | ;-------------------------------------------------------------------- |
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[530] | 162 | FloppyDrive_GetCountFromBIOS_or_BDA: |
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[567] | 163 | %ifdef USE_AT |
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[530] | 164 | ; Reads Floppy Drive Count from BIOS. |
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| 165 | ; Does not work on most XT systems. Call .GetCountFromBDA |
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| 166 | ; if this function fails. |
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[567] | 167 | |
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| 168 | push es |
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[3] | 169 | push di |
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[274] | 170 | push bx |
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| 171 | push cx |
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[3] | 172 | push dx |
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| 173 | |
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[530] | 174 | mov ah, GET_DRIVE_PARAMETERS |
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[86] | 175 | cwd ; Floppy Drive 00h |
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[152] | 176 | int BIOS_DISKETTE_INTERRUPT_40h |
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[551] | 177 | xchg ax, dx ; Number of Floppy Drives to AL |
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[3] | 178 | |
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[274] | 179 | pop dx |
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| 180 | pop cx |
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[3] | 181 | pop bx |
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| 182 | pop di |
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[567] | 183 | pop es |
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[3] | 184 | |
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[567] | 185 | %else ; ifndef USE_AT |
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[3] | 186 | ; Reads Floppy Drive Count (0...4) from BIOS Data Area. |
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[294] | 187 | ; This function should be used only if .GetCountFromBIOS fails. |
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[531] | 188 | |
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[567] | 189 | push ds |
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| 190 | LOAD_BDA_SEGMENT_TO ds, ax |
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| 191 | mov al, [BDA.wEquipment] ; Load Equipment WORD low byte |
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| 192 | pop ds |
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| 193 | |
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[531] | 194 | %ifdef USE_UNDOC_INTEL |
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| 195 | and al, 0C1h |
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| 196 | eAAM 64 |
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| 197 | %else |
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[530] | 198 | mov ah, al ; Copy it to AH |
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| 199 | and ax, 0C001h ; Leave bits 15..14 and 0 |
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| 200 | eROL_IM ah, 2 ; EW low byte bits 7..6 to 1..0 |
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[531] | 201 | %endif ; USE_UNDOC_INTEL |
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| 202 | |
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[530] | 203 | add al, ah ; AL = Floppy Drive count |
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[531] | 204 | %endif ; USE_AT |
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[258] | 205 | |
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[3] | 206 | ret |
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