[541] | 1 | ; Project name : XTIDE Universal BIOS
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| 2 | ; Description : Functions to handle DPT structs to present drive geometry
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| 3 | ; to ill behaving applications that want
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| 4 | ; to read DPT from interrupt vectors 41h and 46h.
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| 5 |
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| 6 | ;
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| 7 | ; XTIDE Universal BIOS and Associated Tools
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| 8 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team.
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| 9 | ;
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| 10 | ; This program is free software; you can redistribute it and/or modify
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| 11 | ; it under the terms of the GNU General Public License as published by
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| 12 | ; the Free Software Foundation; either version 2 of the License, or
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| 13 | ; (at your option) any later version.
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| 14 | ;
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| 15 | ; This program is distributed in the hope that it will be useful,
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| 16 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 17 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 18 | ; GNU General Public License for more details.
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| 19 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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| 20 | ;
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| 21 |
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| 22 | ; Section containing code
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| 23 | SECTION .text
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| 24 |
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| 25 | ;--------------------------------------------------------------------
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| 26 | ; CompatibleDPT_CreateToAXSIforDriveDL
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| 27 | ; Parameters:
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| 28 | ; DL: Drive number (80h or 81h)
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| 29 | ; DS:DI: Ptr to DPT
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| 30 | ; Returns:
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| 31 | ; AX:SI Ptr to destination buffer
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| 32 | ; Corrupts registers:
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| 33 | ; CX, DX
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| 34 | ;--------------------------------------------------------------------
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| 35 | CompatibleDPT_CreateToAXSIforDriveDL:
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| 36 | push es
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| 37 |
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| 38 | call AccessDPT_GetDeviceControlByteToAL
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| 39 | xchg cx, ax ; Device control byte to CL
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| 40 | mov si, di ; DPT now in DS:SI
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| 41 | call GetBufferForDrive80hToESDI
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| 42 | shr dx, 1
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| 43 | jnc SHORT .BufferLoadedToESDI
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| 44 | add di, BYTE TRANSLATED_DPT_size ; For drive 81h
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| 45 | .BufferLoadedToESDI:
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| 46 |
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| 47 | call FillToESDIusingDPTfromDSSI
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| 48 | xchg di, si
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| 49 | mov ax, es
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| 50 |
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| 51 | pop es
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| 52 | ret
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| 53 |
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| 54 |
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| 55 | ;--------------------------------------------------------------------
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| 56 | ; GetTemporaryBufferForDPTEtoESDI
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| 57 | ; GetBufferForDrive80hToESDI
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| 58 | ; Parameters:
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| 59 | ; DS: RAMVARS segment
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| 60 | ; Returns:
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| 61 | ; ES:DI: Ptr to buffer (in RAMVARS segment)
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| 62 | ; Corrupts registers:
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| 63 | ; Nothing
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| 64 | ;--------------------------------------------------------------------
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| 65 | GetTemporaryBufferForDPTEtoESDI:
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| 66 | call GetBufferForDrive80hToESDI
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| 67 | add di, BYTE TRANSLATED_DPT_size * 2
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| 68 | ret
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| 69 |
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| 70 | GetBufferForDrive80hToESDI:
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| 71 | push ds
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| 72 | pop es
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| 73 | mov di, [cs:ROMVARS.bStealSize] ; No harm to read WORD
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| 74 | eSHL_IM di, 10 ; DI = RAMVARS size in bytes
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| 75 | sub di, BYTE (TRANSLATED_DPT_size * 2) + DPTE_size
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| 76 | ret
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| 77 |
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| 78 |
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| 79 | ;--------------------------------------------------------------------
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| 80 | ; FillToESDIusingDPTfromDSSI
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| 81 | ; Parameters:
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| 82 | ; CL: Device Control Byte
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| 83 | ; DS:SI: Ptr to DPT
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| 84 | ; ES:DI Ptr to destination buffer
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| 85 | ; Returns:
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| 86 | ; Nothing
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| 87 | ; Corrupts registers:
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| 88 | ; AX, CX, DX
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| 89 | ;--------------------------------------------------------------------
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| 90 | FillToESDIusingDPTfromDSSI:
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[543] | 91 | mov ax, [si+DPT.wLchsCylinders]
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| 92 | call AH8h_LimitAXtoMaximumLCylinders
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[541] | 93 | test BYTE [si+DPT.bFlagsLow], MASKL_DPT_TRANSLATEMODE
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| 94 | jz SHORT FillStandardDPTtoESDIfromDPTinDSSI
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| 95 | ; Fall to FillTranslatedDPTtoESDIfromDPTinDSSI
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| 96 |
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| 97 | ;--------------------------------------------------------------------
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| 98 | ; FillTranslatedDPTtoESDIfromDPTinDSSI
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| 99 | ; Parameters:
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[543] | 100 | ; AX: Number of Logical Cylinders
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[541] | 101 | ; CL: Device Control Byte
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| 102 | ; DS:SI: Ptr to DPT
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| 103 | ; ES:DI: Ptr to destination buffer
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| 104 | ; Returns:
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| 105 | ; Nothing
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| 106 | ; Corrupts registers:
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| 107 | ; AX, CX, DX
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| 108 | ;--------------------------------------------------------------------
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| 109 | FillTranslatedDPTtoESDIfromDPTinDSSI:
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| 110 | xor dx, dx ; Clear for checksum
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| 111 | call StoswThenAddALandAHtoDL ; Bytes 0 and 1 (Logical number of cylinders)
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| 112 |
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| 113 | mov al, BYTE [si+DPT.bLchsHeads]
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| 114 | mov ah, TRANSLATED_DPT_SIGNATURE
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| 115 | call StoswThenAddALandAHtoDL ; Bytes 2 (Logical number of heads) and 3 (Axh signature to indicate Translated DPT)
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| 116 |
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| 117 | eMOVZX ax, BYTE [si+DPT.bPchsSectorsPerTrack]
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| 118 | call StoswThenAddALandAHtoDL ; Bytes 4 (Physical sectors per track) and 5 (Write Precompensation Cylinder low)
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| 119 |
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| 120 | mov al, ah
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| 121 | call StoswThenAddALandAHtoDL ; Bytes 6 (Write Precompensation Cylinder high) and 7
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| 122 |
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| 123 | xchg ax, cx ; Device Control byte to AL
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| 124 | mov ah, [si+DPT.wPchsCylinders]
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| 125 | call StoswThenAddALandAHtoDL ; Bytes 8 (Drive Control Byte) and 9 (Physical number of cylinders low)
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| 126 |
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| 127 | mov al, [si+DPT.wPchsCylinders+1]
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| 128 | mov ah, [si+DPT.bPchsHeads]
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| 129 | call StoswThenAddALandAHtoDL ; Bytes 10 (Physical number of cylinders high) and 11 (Physical number of heads)
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| 130 |
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| 131 | xor ax, ax
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| 132 | call StoswThenAddALandAHtoDL ; Bytes 12 and 13 (Landing Zone Cylinder)
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| 133 |
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| 134 | mov al, [si+DPT.bLchsSectorsPerTrack]
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| 135 | %ifdef USE_186
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| 136 | push FillStandardDPTtoESDIfromDPTinDSSI.RestoreOffsetsAndReturn
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| 137 | jmp StoswALandChecksumFromDL ; Bytes 14 (Logical sectors per track) and 15 (Checksum)
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| 138 | %else
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| 139 | call StoswALandChecksumFromDL
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| 140 | jmp SHORT FillStandardDPTtoESDIfromDPTinDSSI.RestoreOffsetsAndReturn
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| 141 | %endif
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| 142 |
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| 143 |
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| 144 | ;--------------------------------------------------------------------
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| 145 | ; FillStandardDPTtoESDIfromDPTinDSSI
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| 146 | ; Parameters:
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[543] | 147 | ; AX: Number of Physical Cylinders == Number of Logical Cylinders
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[541] | 148 | ; CL: Device Control Byte
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| 149 | ; DS:SI: Ptr to DPT
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| 150 | ; ES:DI: Ptr to destination buffer
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| 151 | ; Returns:
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| 152 | ; Nothing
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| 153 | ; Corrupts registers:
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| 154 | ; AX
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| 155 | ;--------------------------------------------------------------------
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| 156 | FillStandardDPTtoESDIfromDPTinDSSI:
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| 157 | stosw ; Bytes 0 and 1 (Physical number of cylinders)
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| 158 | eMOVZX ax, BYTE [si+DPT.bLchsHeads]
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| 159 | stosw ; Bytes 2 (Physical number of heads) and 3
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| 160 | mov al, ah ; Zero AX
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| 161 | stosw ; Bytes 4 and 5 (Write Precompensation Cylinder low)
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| 162 | stosw ; Bytes 6 (Write Precompensation Cylinder high) and 7
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| 163 | mov al, cl ; Device control byte to AL
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| 164 | stosw ; Bytes 8 (Drive Control Byte) and 9
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| 165 | mov al, ah ; Zero AX
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| 166 | stosw ; Bytes 10 and 11
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| 167 | stosw ; Bytes 12 and 13 (Landing Zone Cylinder)
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| 168 | mov al, [si+DPT.bLchsSectorsPerTrack]
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| 169 | stosw ; Bytes 14 (Physical sectors per track) and 15
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| 170 |
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| 171 | .RestoreOffsetsAndReturn:
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| 172 | sub di, BYTE STANDARD_DPT_size
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| 173 | ret
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| 174 |
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| 175 |
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| 176 | ;--------------------------------------------------------------------
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| 177 | ; CompatibleDPT_CreateDeviceParameterTableExtensionToESBXfromDPTinDSSI
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| 178 | ; Parameters:
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| 179 | ; DS:SI: Ptr to DPT (in RAMVARS segment)
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| 180 | ; Returns:
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| 181 | ; ES:BX: Ptr to Device Parameter Table Extension (DPTE)
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| 182 | ; Corrupts registers:
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| 183 | ; AX, CX, DX, DI
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| 184 | ;--------------------------------------------------------------------
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| 185 | CompatibleDPT_CreateDeviceParameterTableExtensionToESBXfromDPTinDSSI:
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| 186 | call GetTemporaryBufferForDPTEtoESDI ; valid until next AH=48h call
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| 187 |
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| 188 | ; Set 32-bit flag for 32-bit controllers
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| 189 | mov cx, FLG_LBA_TRANSLATION_ENABLED ; DPTE.wFlags
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| 190 | cmp BYTE [si+DPT_ATA.bDevice], DEVICE_32BIT_ATA
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| 191 | eCMOVE cl, FLG_LBA_TRANSLATION_ENABLED | FLG_32BIT_XFER_MODE
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| 192 |
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| 193 | ; DPTE.wBasePort
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| 194 | mov ax, [si+DPT.wBasePort]
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| 195 | call StoswThenAddALandAHtoDL ; Bytes 0 and 1
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| 196 |
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| 197 | ; DPTE.wControlBlockPort
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| 198 | eMOVZX bx, BYTE [si+DPT.bIdevarsOffset]
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| 199 | mov ax, [cs:bx+IDEVARS.wControlBlockPort]
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| 200 | call StoswThenAddALandAHtoDL ; Bytes 2 and 3
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| 201 |
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| 202 | ; DPTE.bDrvnhead and DPTE.bBiosVendor
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| 203 | xchg di, si
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[542] | 204 | call AccessDPT_GetDriveSelectByteToAL
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[541] | 205 | xchg si, di
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| 206 | call StoswThenAddALandAHtoDL ; Bytes 4 and 5
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| 207 |
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| 208 | ; DPTE.bIRQ and DPTE.bBlockSize
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| 209 | mov al, [cs:bx+IDEVARS.bIRQ] ; No way to define that we might not use IRQ
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| 210 | mov ah, [si+DPT_ATA.bBlockSize]
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| 211 | cmp ah, 1
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| 212 | jbe SHORT .DoNotSetBlockModeFlag
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| 213 | or cl, FLG_BLOCK_MODE_ENABLED
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| 214 | .DoNotSetBlockModeFlag:
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| 215 | call StoswThenAddALandAHtoDL ; Bytes 6 and 7
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| 216 |
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| 217 | ; DPTE.bDmaChannelAndType and DPTE.bPioMode
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| 218 | xor ax, ax
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| 219 | %ifdef MODULE_ADVANCED_ATA
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| 220 | or ah, [si+DPT_ADVANCED_ATA.bPioMode]
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| 221 | jz SHORT .NoDotSetFastPioFlag
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| 222 | cmp WORD [si+DPT_ADVANCED_ATA.wControllerID], BYTE 0
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| 223 | je SHORT .NoDotSetFastPioFlag
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| 224 | inc cx ; FLG_FAST_PIO_ENABLED
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| 225 | .NoDotSetFastPioFlag:
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| 226 | %endif
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| 227 | call StoswThenAddALandAHtoDL ; Bytes 8 and 9
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| 228 |
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| 229 | ; Set CHS translation flags and store DPTE.wFlags
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| 230 | mov al, [si+DPT.bFlagsLow]
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| 231 | and al, MASKL_DPT_TRANSLATEMODE
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| 232 | jz SHORT .NoChsTranslationOrBitShiftTranslationSet
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| 233 | or cl, FLG_CHS_TRANSLATION_ENABLED
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| 234 | test al, FLGL_DPT_ASSISTED_LBA
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| 235 | jz SHORT .NoChsTranslationOrBitShiftTranslationSet
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| 236 | or cx, LBA_ASSISTED_TRANSLATION << TRANSLATION_TYPE_FIELD_POSITION
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| 237 | .NoChsTranslationOrBitShiftTranslationSet:
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| 238 | xchg ax, cx
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| 239 | call StoswThenAddALandAHtoDL ; Bytes 10 and 11
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| 240 |
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| 241 | ; DPTE.wReserved (must be zero)
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| 242 | xor ax, ax
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| 243 | call StoswThenAddALandAHtoDL ; Bytes 12 and 13
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| 244 |
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| 245 | ; DPTE.bRevision and DPTE.bChecksum
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| 246 | mov al, DPTE_REVISION
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| 247 | call StoswALandChecksumFromDL ; Bytes 14 and 15
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| 248 | lea bx, [di-DPTE_size]
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| 249 | ret
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| 250 |
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| 251 |
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| 252 | ;--------------------------------------------------------------------
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| 253 | ; StoswThenAddALandAHtoDL
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| 254 | ; Parameters:
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| 255 | ; AX: WORD to store
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| 256 | ; DL: Sum of bytes so far
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| 257 | ; ES:DI: Ptr to where to store AX
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| 258 | ; Returns:
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| 259 | ; DL: Sum of bytes so far
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| 260 | ; DI: Incremented by 2
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| 261 | ; Corrupts registers:
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| 262 | ; Nothing
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| 263 | ;--------------------------------------------------------------------
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| 264 | StoswThenAddALandAHtoDL:
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| 265 | stosw
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| 266 | add dl, al
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| 267 | add dl, ah
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| 268 | ret
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| 269 |
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| 270 |
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| 271 | ;--------------------------------------------------------------------
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| 272 | ; StoswALandChecksumFromDL
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| 273 | ; Parameters:
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| 274 | ; AL: Last byte to store before checksum byte
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| 275 | ; DL: Sum of bytes so far
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| 276 | ; ES:DI: Ptr to where to store AL and Checksum byte
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| 277 | ; Returns:
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| 278 | ; DL: Sum of bytes so far
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| 279 | ; DI: Incremented by 2
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| 280 | ; Corrupts registers:
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| 281 | ; Nothing
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| 282 | ;--------------------------------------------------------------------
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| 283 | StoswALandChecksumFromDL:
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| 284 | mov ah, al
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| 285 | add ah, dl
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| 286 | neg ah
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| 287 | stosw
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| 288 | ret
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