[93] | 1 | ; Project name : XTIDE Universal BIOS
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[3] | 2 | ; Description : Int 13h function AH=8h, Read Disk Drive Parameters.
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| 3 |
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[376] | 4 | ;
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| 5 | ; XTIDE Universal BIOS and Associated Tools
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| 6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2012 by XTIDE Universal BIOS Team.
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| 7 | ;
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| 8 | ; This program is free software; you can redistribute it and/or modify
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| 9 | ; it under the terms of the GNU General Public License as published by
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| 10 | ; the Free Software Foundation; either version 2 of the License, or
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| 11 | ; (at your option) any later version.
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| 12 | ;
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| 13 | ; This program is distributed in the hope that it will be useful,
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| 14 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 15 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 16 | ; GNU General Public License for more details.
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| 17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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| 18 | ;
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| 19 |
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[3] | 20 | ; Section containing code
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| 21 | SECTION .text
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| 22 |
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| 23 | ;--------------------------------------------------------------------
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| 24 | ; Int 13h function AH=8h, Read Disk Drive Parameters.
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| 25 | ;
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| 26 | ; AH8h_HandlerForReadDiskDriveParameters
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| 27 | ; Parameters:
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[148] | 28 | ; DL: Translated Drive number
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| 29 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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[150] | 30 | ; SS:BP: Ptr to IDEPACK
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| 31 | ; Returns with INTPACK:
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[258] | 32 | ; BL: Drive Type (for floppies only)
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[3] | 33 | ; CH: Maximum cylinder number, bits 7...0
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| 34 | ; CL: Bits 7...6: Cylinder number bits 9...8
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| 35 | ; Bits 5...0: Maximum sector number (1...63)
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[285] | 36 | ; DH: Maximum head number (0...254)
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[3] | 37 | ; DL: Number of drives
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[258] | 38 | ; ES:DI: Floppy DPT (for floppies only)
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[3] | 39 | ; AH: Int 13h/40h floppy return status
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[294] | 40 | ; CF: 0 if successful, 1 if error
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[3] | 41 | ;--------------------------------------------------------------------
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| 42 | AH8h_HandlerForReadDiskDriveParameters:
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[332] | 43 | test di, di
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| 44 | jz SHORT .NotOurDrive
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[258] | 45 |
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[3] | 46 | call AH8h_GetDriveParameters
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| 47 |
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[258] | 48 | %ifdef MODULE_SERIAL_FLOPPY
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| 49 | push cs ; setup registers if we are a floppy drive, in all cases
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| 50 | pop es ; if it is not a floppy drive, these values will not be put in INTPACK
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| 51 | mov di, AH8h_FloppyDPT
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| 52 | %endif
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| 53 | ;; fall-through
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[294] | 54 |
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| 55 | .MidGame:
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[258] | 56 | call RamVars_GetCountOfKnownDrivesToAX ; assume hard disk for now, will discard if for floppies
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| 57 |
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| 58 | test byte [bp+IDEPACK.intpack+INTPACK.dl], 080h
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| 59 | jnz .Done
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[294] | 60 |
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[258] | 61 | mov [bp+IDEPACK.intpack+INTPACK.bl], bl
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| 62 |
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| 63 | mov [bp+IDEPACK.intpack+INTPACK.es], es
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[294] | 64 | mov [bp+IDEPACK.intpack+INTPACK.di], di
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[258] | 65 |
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| 66 | call FloppyDrive_GetCountToAX
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| 67 |
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[294] | 68 | .Done:
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[258] | 69 | mov ah, dh
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[294] | 70 |
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[150] | 71 | mov [bp+IDEPACK.intpack+INTPACK.cx], cx
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[258] | 72 | xchg [bp+IDEPACK.intpack+INTPACK.dx], ax ; recover DL for BDA last status byte determination
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| 73 |
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[148] | 74 | xor ah, ah
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[258] | 75 | %ifdef MODULE_SERIAL_FLOPPY
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[294] | 76 | jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH_ALHasDriveNumber
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[258] | 77 | %else
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[148] | 78 | jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
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[258] | 79 | %endif
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[3] | 80 |
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[332] | 81 | .NotOurDrive:
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| 82 | call Int13h_CallPreviousInt13hHandler
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| 83 | jnc SHORT .MidGame
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| 84 | jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
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[32] | 85 |
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[332] | 86 |
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[3] | 87 | ;--------------------------------------------------------------------
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| 88 | ; Returns L-CHS parameters for drive and total hard disk count.
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| 89 | ;
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[28] | 90 | ; AH8h_GetDriveParameters
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[3] | 91 | ; Parameters:
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[148] | 92 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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[3] | 93 | ; Returns:
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| 94 | ; CH: Maximum cylinder number, bits 7...0
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| 95 | ; CL: Bits 7...6: Cylinder number bits 9...8
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| 96 | ; Bits 5...0: Maximum sector number (1...63)
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[285] | 97 | ; DH: Maximum head number (0...254)
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[3] | 98 | ; Corrupts registers:
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[148] | 99 | ; AX, BX
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[3] | 100 | ;--------------------------------------------------------------------
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| 101 | AH8h_GetDriveParameters:
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[227] | 102 | call AccessDPT_GetLCHStoAXBLBH
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[148] | 103 | ; Fall to .PackReturnValues
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[3] | 104 |
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| 105 | ;--------------------------------------------------------------------
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| 106 | ; Packs L-CHS values to INT 13h, AH=08h return values.
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| 107 | ;
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[148] | 108 | ; .PackReturnValues
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[3] | 109 | ; Parameters:
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[227] | 110 | ; AX: Number of L-CHS cylinders available (1...1024)
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[285] | 111 | ; BL: Number of L-CHS heads (1...255)
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[227] | 112 | ; BH: Number of L-CHS sectors per track (1...63)
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[32] | 113 | ; DS: RAMVARS segment
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[3] | 114 | ; Returns:
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| 115 | ; CH: Maximum cylinder number, bits 7...0
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| 116 | ; CL: Bits 7...6: Cylinder number bits 9...8
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| 117 | ; Bits 5...0: Maximum sector number (1...63)
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[285] | 118 | ; DH: Maximum head number (0...254)
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[3] | 119 | ; Corrupts registers:
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| 120 | ; AX, BX
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| 121 | ;--------------------------------------------------------------------
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[148] | 122 | .PackReturnValues:
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[227] | 123 | dec ax ; AX = Number of last cylinder
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| 124 | dec bx ; BL = Number of last head
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| 125 | xchg cx, ax
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| 126 | xchg cl, ch ; CH = Last cylinder bits 0...7
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| 127 | eROR_IM cl, 2 ; CL bits 6...7 = Last cylinder bits 8...9
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| 128 | or cl, bh ; CL bits 0...5 = Sectors per track
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| 129 | mov dh, bl ; DH = Maximum head number
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[285] | 130 |
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[258] | 131 | %ifdef MODULE_SERIAL_FLOPPY
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[332] | 132 | mov bl, [di+DPT.bFlagsHigh]
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[261] | 133 | %ifndef CHECK_FOR_UNUSED_ENTRYPOINTS ; not sure why this is needed for preprocessor-only
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[332] | 134 | eSHR_IM bl, FLGH_DPT_SERIAL_FLOPPY_TYPE_FIELD_POSITION
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[261] | 135 | %endif
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[294] | 136 | %endif
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[258] | 137 | ret
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| 138 |
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| 139 | %ifdef MODULE_SERIAL_FLOPPY
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| 140 | ;
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| 141 | ; Floppy Disk Parameter Table. There is no way to specify more than one of these
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| 142 | ; for any given system, so no way to make this drive or media specific.
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[261] | 143 | ; So we return fixed values out of the ROM for callers who might be expecting this information.
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[258] | 144 | ;
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[294] | 145 | ; On AT systems, we return the information for a 1.44 MB disk,
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[258] | 146 | ; and on XT systems, we return the information for a 360 KB disk.
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| 147 | ;
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| 148 | AH8h_FloppyDPT:
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| 149 | %ifdef USE_AT
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| 150 | db 0ah << 4 | 0fh ; Offset 0: Drive timings, 1.44MB values
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| 151 | %else
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| 152 | db 0dh << 4 | 0fh ; Offset 0: Drive timings, 360KB values
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| 153 | %endif
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| 154 |
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| 155 | db 1h << 1 | 0 ; Offset 1: Typical values of 1 for head load time
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[294] | 156 | ; DMA used (although it actually is not, but is more restrictive)
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| 157 | db 25h ; Offset 2: Inactivity motor turn-off delay,
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[258] | 158 | ; Typical value of 25h for 2 second delay
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| 159 | db 02h ; Offset 3: Sector size, always 512
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| 160 |
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| 161 | %ifdef USE_AT
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| 162 | db 12h ; Offset 4: Sectors per track, 1.44MB value
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| 163 | db 1bh ; Offset 5: Sector gap, 1.44MB value
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| 164 | %else
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| 165 | db 09h ; Offset 4: Sectors per track, 360KB value
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| 166 | db 2ah ; Offset 5: Sector gap, 360KB value
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| 167 | %endif
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| 168 |
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| 169 | db 0ffh ; Offset 6: Data length
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| 170 |
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| 171 | %ifdef USE_AT
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| 172 | db 6ch ; Offset 7: Format gap length, 1.44MB value
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| 173 | %else
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| 174 | db 50h ; Offset 7: Format gap length, 360KB value
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| 175 | %endif
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| 176 |
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| 177 | db 0f6h ; Offset 8: Fill byte for format
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| 178 | db 0fh ; Offset 9: Head setting time
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[294] | 179 | db 08h ; Offset A: Wait for motor startup time
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[258] | 180 |
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| 181 | %ifdef USE_AT
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| 182 | db 79 ; Offset B: Maximum track number, 1.44MB value
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| 183 | db 0 ; Offset C: Data transfer rate, 1.44MB value
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| 184 | db 4 ; Offset D: Diskette CMOS drive type, 1.44MB value
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| 185 | %else
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| 186 | db 39 ; Offset B: Maximum track number, 360KB value
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| 187 | db 80h ; Offset C: Data transfer rate, 360KB value
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| 188 | db 1 ; Offset D: Diskette CMOS drive type, 360KB value
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| 189 | %endif
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| 190 | %endif
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