[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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[550] | 65 | %ifdef MODULE_EBIOS |
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[541] | 66 | GetTemporaryBufferForDPTEtoESDI: |
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| 67 | call GetBufferForDrive80hToESDI |
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| 68 | add di, BYTE TRANSLATED_DPT_size * 2 |
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| 69 | ret |
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[550] | 70 | %endif |
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[541] | 71 | |
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| 72 | GetBufferForDrive80hToESDI: |
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| 73 | push ds |
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| 74 | pop es |
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| 75 | mov di, [cs:ROMVARS.bStealSize] ; No harm to read WORD |
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| 76 | eSHL_IM di, 10 ; DI = RAMVARS size in bytes |
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[550] | 77 | %ifdef MODULE_EBIOS |
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[541] | 78 | sub di, BYTE (TRANSLATED_DPT_size * 2) + DPTE_size |
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[550] | 79 | %else |
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| 80 | sub di, BYTE TRANSLATED_DPT_size * 2 |
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| 81 | %endif |
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[541] | 82 | ret |
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| 83 | |
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| 84 | |
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| 85 | ;-------------------------------------------------------------------- |
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| 86 | ; FillToESDIusingDPTfromDSSI |
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| 87 | ; Parameters: |
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| 88 | ; CL: Device Control Byte |
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| 89 | ; DS:SI: Ptr to DPT |
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| 90 | ; ES:DI Ptr to destination buffer |
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| 91 | ; Returns: |
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| 92 | ; Nothing |
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| 93 | ; Corrupts registers: |
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| 94 | ; AX, CX, DX |
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| 95 | ;-------------------------------------------------------------------- |
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| 96 | FillToESDIusingDPTfromDSSI: |
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[543] | 97 | mov ax, [si+DPT.wLchsCylinders] |
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| 98 | call AH8h_LimitAXtoMaximumLCylinders |
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[541] | 99 | test BYTE [si+DPT.bFlagsLow], MASKL_DPT_TRANSLATEMODE |
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| 100 | jz SHORT FillStandardDPTtoESDIfromDPTinDSSI |
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| 101 | ; Fall to FillTranslatedDPTtoESDIfromDPTinDSSI |
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| 102 | |
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| 103 | ;-------------------------------------------------------------------- |
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| 104 | ; FillTranslatedDPTtoESDIfromDPTinDSSI |
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| 105 | ; Parameters: |
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[543] | 106 | ; AX: Number of Logical Cylinders |
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[541] | 107 | ; CL: Device Control Byte |
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| 108 | ; DS:SI: Ptr to DPT |
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| 109 | ; ES:DI: Ptr to destination buffer |
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| 110 | ; Returns: |
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| 111 | ; Nothing |
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| 112 | ; Corrupts registers: |
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| 113 | ; AX, CX, DX |
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| 114 | ;-------------------------------------------------------------------- |
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| 115 | FillTranslatedDPTtoESDIfromDPTinDSSI: |
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[568] | 116 | cwd ; Clear for checksum |
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[541] | 117 | call StoswThenAddALandAHtoDL ; Bytes 0 and 1 (Logical number of cylinders) |
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| 118 | |
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[568] | 119 | mov al, [si+DPT.bLchsHeads] |
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[541] | 120 | mov ah, TRANSLATED_DPT_SIGNATURE |
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| 121 | call StoswThenAddALandAHtoDL ; Bytes 2 (Logical number of heads) and 3 (Axh signature to indicate Translated DPT) |
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| 122 | |
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[568] | 123 | eMOVZX ax, [si+DPT.bPchsSectorsPerTrack] |
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[541] | 124 | call StoswThenAddALandAHtoDL ; Bytes 4 (Physical sectors per track) and 5 (Write Precompensation Cylinder low) |
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| 125 | |
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[568] | 126 | mov al, ah ; Zero AX |
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| 127 | stosw ; Bytes 6 (Write Precompensation Cylinder high) and 7 |
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[541] | 128 | |
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[568] | 129 | xchg cx, ax ; Device Control byte to AL, zero to CX |
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[541] | 130 | mov ah, [si+DPT.wPchsCylinders] |
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| 131 | call StoswThenAddALandAHtoDL ; Bytes 8 (Drive Control Byte) and 9 (Physical number of cylinders low) |
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| 132 | |
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| 133 | mov al, [si+DPT.wPchsCylinders+1] |
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| 134 | mov ah, [si+DPT.bPchsHeads] |
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| 135 | call StoswThenAddALandAHtoDL ; Bytes 10 (Physical number of cylinders high) and 11 (Physical number of heads) |
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| 136 | |
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[568] | 137 | xchg cx, ax ; Zero to AX |
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| 138 | stosw ; Bytes 12 and 13 (Landing Zone Cylinder) |
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[541] | 139 | |
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| 140 | mov al, [si+DPT.bLchsSectorsPerTrack] |
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[558] | 141 | %ifndef USE_186 |
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| 142 | call StoswALandChecksumFromDL ; Bytes 14 (Logical sectors per track) and 15 (Checksum) |
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| 143 | jmp SHORT FillStandardDPTtoESDIfromDPTinDSSI.RestoreOffsetsAndReturn |
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| 144 | %else |
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[541] | 145 | push FillStandardDPTtoESDIfromDPTinDSSI.RestoreOffsetsAndReturn |
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[558] | 146 | ; Fall to StoswALandChecksumFromDL |
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[541] | 147 | %endif |
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| 148 | |
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| 149 | |
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| 150 | ;-------------------------------------------------------------------- |
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[558] | 151 | ; StoswALandChecksumFromDL |
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| 152 | ; Parameters: |
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| 153 | ; AL: Last byte to store before checksum byte |
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| 154 | ; DL: Sum of bytes so far |
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| 155 | ; ES:DI: Ptr to where to store AL and Checksum byte |
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| 156 | ; Returns: |
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| 157 | ; DL: Sum of bytes so far |
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| 158 | ; DI: Incremented by 2 |
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| 159 | ; Corrupts registers: |
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[568] | 160 | ; AH |
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[558] | 161 | ;-------------------------------------------------------------------- |
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| 162 | StoswALandChecksumFromDL: |
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| 163 | mov ah, al |
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| 164 | add ah, dl |
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| 165 | neg ah |
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| 166 | stosw |
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| 167 | ret |
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| 168 | |
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| 169 | |
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| 170 | ;-------------------------------------------------------------------- |
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[541] | 171 | ; FillStandardDPTtoESDIfromDPTinDSSI |
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| 172 | ; Parameters: |
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[543] | 173 | ; AX: Number of Physical Cylinders == Number of Logical Cylinders |
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[541] | 174 | ; CL: Device Control Byte |
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| 175 | ; DS:SI: Ptr to DPT |
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| 176 | ; ES:DI: Ptr to destination buffer |
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| 177 | ; Returns: |
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| 178 | ; Nothing |
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| 179 | ; Corrupts registers: |
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| 180 | ; AX |
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| 181 | ;-------------------------------------------------------------------- |
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| 182 | FillStandardDPTtoESDIfromDPTinDSSI: |
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| 183 | stosw ; Bytes 0 and 1 (Physical number of cylinders) |
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[568] | 184 | eMOVZX ax, [si+DPT.bLchsHeads] |
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[541] | 185 | stosw ; Bytes 2 (Physical number of heads) and 3 |
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[568] | 186 | %ifdef USE_UNDOC_INTEL |
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| 187 | %ifdef USE_386 |
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| 188 | xor al, al ; Zero AX and clear CF |
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| 189 | %else |
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| 190 | salc ; Zero AX (CF cleared by eMOVZX above) |
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| 191 | %endif |
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| 192 | %else |
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[541] | 193 | mov al, ah ; Zero AX |
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[568] | 194 | %endif |
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[541] | 195 | stosw ; Bytes 4 and 5 (Write Precompensation Cylinder low) |
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| 196 | stosw ; Bytes 6 (Write Precompensation Cylinder high) and 7 |
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| 197 | mov al, cl ; Device control byte to AL |
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| 198 | stosw ; Bytes 8 (Drive Control Byte) and 9 |
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[568] | 199 | %ifdef USE_UNDOC_INTEL |
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| 200 | salc ; Zero AX (CF cleared above) |
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| 201 | %else |
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[541] | 202 | mov al, ah ; Zero AX |
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[568] | 203 | %endif |
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[541] | 204 | stosw ; Bytes 10 and 11 |
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| 205 | stosw ; Bytes 12 and 13 (Landing Zone Cylinder) |
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| 206 | mov al, [si+DPT.bLchsSectorsPerTrack] |
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| 207 | stosw ; Bytes 14 (Physical sectors per track) and 15 |
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| 208 | |
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| 209 | .RestoreOffsetsAndReturn: |
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| 210 | sub di, BYTE STANDARD_DPT_size |
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| 211 | ret |
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| 212 | |
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| 213 | |
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[550] | 214 | %ifdef MODULE_EBIOS |
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[541] | 215 | ;-------------------------------------------------------------------- |
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| 216 | ; CompatibleDPT_CreateDeviceParameterTableExtensionToESBXfromDPTinDSSI |
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| 217 | ; Parameters: |
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| 218 | ; DS:SI: Ptr to DPT (in RAMVARS segment) |
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| 219 | ; Returns: |
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| 220 | ; ES:BX: Ptr to Device Parameter Table Extension (DPTE) |
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| 221 | ; Corrupts registers: |
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[568] | 222 | ; AX, CX, DL, DI |
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[541] | 223 | ;-------------------------------------------------------------------- |
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| 224 | CompatibleDPT_CreateDeviceParameterTableExtensionToESBXfromDPTinDSSI: |
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[568] | 225 | call GetTemporaryBufferForDPTEtoESDI ; Valid until next AH=48h call |
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[541] | 226 | |
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| 227 | ; Set 32-bit flag for 32-bit controllers |
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| 228 | mov cx, FLG_LBA_TRANSLATION_ENABLED ; DPTE.wFlags |
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| 229 | cmp BYTE [si+DPT_ATA.bDevice], DEVICE_32BIT_ATA |
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| 230 | eCMOVE cl, FLG_LBA_TRANSLATION_ENABLED | FLG_32BIT_XFER_MODE |
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| 231 | |
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[568] | 232 | xor dl, dl ; Clear DL for checksum |
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[589] | 233 | push bp |
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| 234 | mov bp, StoswThenAddALandAHtoDL |
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[568] | 235 | |
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[541] | 236 | ; DPTE.wBasePort |
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| 237 | mov ax, [si+DPT.wBasePort] |
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[589] | 238 | call bp ; Bytes 0 and 1 |
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[541] | 239 | |
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| 240 | ; DPTE.wControlBlockPort |
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[568] | 241 | eMOVZX bx, [si+DPT.bIdevarsOffset] |
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[541] | 242 | mov ax, [cs:bx+IDEVARS.wControlBlockPort] |
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[589] | 243 | call bp ; Bytes 2 and 3 |
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[541] | 244 | |
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| 245 | ; DPTE.bDrvnhead and DPTE.bBiosVendor |
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| 246 | xchg di, si |
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[542] | 247 | call AccessDPT_GetDriveSelectByteToAL |
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[541] | 248 | xchg si, di |
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[589] | 249 | call bp ; Bytes 4 and 5 |
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[541] | 250 | |
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| 251 | ; DPTE.bIRQ and DPTE.bBlockSize |
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| 252 | mov al, [cs:bx+IDEVARS.bIRQ] ; No way to define that we might not use IRQ |
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[589] | 253 | mov ah, [si+DPT_ATA.bBlockSize] ; DPT_ATA.bBlockSize must never be zero! |
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| 254 | sahf ; Only block size = 1 sets CF |
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| 255 | jc SHORT .DoNotSetBlockModeFlag |
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[541] | 256 | or cl, FLG_BLOCK_MODE_ENABLED |
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| 257 | .DoNotSetBlockModeFlag: |
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[589] | 258 | call bp ; Bytes 6 and 7 |
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[541] | 259 | |
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| 260 | ; DPTE.bDmaChannelAndType and DPTE.bPioMode |
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| 261 | xor ax, ax |
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[568] | 262 | %ifndef MODULE_ADVANCED_ATA |
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| 263 | stosw ; Bytes 8 and 9 |
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| 264 | %else |
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[541] | 265 | or ah, [si+DPT_ADVANCED_ATA.bPioMode] |
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[558] | 266 | jz SHORT .DoNotSetFastPioFlag |
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[568] | 267 | cmp WORD [si+DPT_ADVANCED_ATA.wControllerID], BYTE 1 |
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| 268 | sbb cl, -1 ; FLG_FAST_PIO_ENABLED (if .wControllerID > 0) |
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[558] | 269 | .DoNotSetFastPioFlag: |
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[589] | 270 | call bp ; Bytes 8 and 9 |
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[541] | 271 | %endif |
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| 272 | |
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| 273 | ; Set CHS translation flags and store DPTE.wFlags |
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| 274 | mov al, [si+DPT.bFlagsLow] |
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| 275 | and al, MASKL_DPT_TRANSLATEMODE |
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| 276 | jz SHORT .NoChsTranslationOrBitShiftTranslationSet |
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| 277 | or cl, FLG_CHS_TRANSLATION_ENABLED |
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| 278 | test al, FLGL_DPT_ASSISTED_LBA |
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| 279 | jz SHORT .NoChsTranslationOrBitShiftTranslationSet |
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[568] | 280 | or ch, LBA_ASSISTED_TRANSLATION << (TRANSLATION_TYPE_FIELD_POSITION - 8) |
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[541] | 281 | .NoChsTranslationOrBitShiftTranslationSet: |
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| 282 | xchg ax, cx |
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[589] | 283 | call bp ; Bytes 10 and 11 |
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| 284 | pop bp |
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[541] | 285 | |
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| 286 | ; DPTE.wReserved (must be zero) |
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| 287 | xor ax, ax |
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[568] | 288 | stosw ; Bytes 12 and 13 |
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[541] | 289 | |
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| 290 | ; DPTE.bRevision and DPTE.bChecksum |
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| 291 | mov al, DPTE_REVISION |
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[568] | 292 | lea bx, [di+2-DPTE_size] ; The +2 compensates for the last WORD yet to be stored |
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| 293 | jmp StoswALandChecksumFromDL ; Bytes 14 and 15 |
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[550] | 294 | %endif ; MODULE_EBIOS |
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[541] | 295 | |
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| 296 | |
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| 297 | ;-------------------------------------------------------------------- |
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| 298 | ; StoswThenAddALandAHtoDL |
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| 299 | ; Parameters: |
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| 300 | ; AX: WORD to store |
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| 301 | ; DL: Sum of bytes so far |
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| 302 | ; ES:DI: Ptr to where to store AX |
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| 303 | ; Returns: |
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| 304 | ; DL: Sum of bytes so far |
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| 305 | ; DI: Incremented by 2 |
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| 306 | ; Corrupts registers: |
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| 307 | ; Nothing |
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| 308 | ;-------------------------------------------------------------------- |
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| 309 | StoswThenAddALandAHtoDL: |
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| 310 | stosw |
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| 311 | add dl, al |
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| 312 | add dl, ah |
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| 313 | ret |
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| 314 | |
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