[99] | 1 | ; Project name : XTIDE Universal BIOS
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[3] | 2 | ; Description : Functions for accessing DPT data.
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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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[364] | 23 | %ifdef MODULE_ADVANCED_ATA
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[3] | 24 | ;--------------------------------------------------------------------
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[364] | 25 | ; AccessDPT_GetIdeBasePortToBX
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| 26 | ; Parameters:
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| 27 | ; DS:DI: Ptr to Disk Parameter Table
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| 28 | ; Returns:
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| 29 | ; BX: IDE Base Port Address
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| 30 | ; Corrupts registers:
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| 31 | ; Nothing
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| 32 | ;--------------------------------------------------------------------
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| 33 | ALIGN JUMP_ALIGN
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| 34 | AccessDPT_GetIdeBasePortToBX:
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| 35 | eMOVZX bx, [di+DPT.bIdevarsOffset] ; CS:BX points to IDEVARS
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| 36 | mov bx, [cs:bx+IDEVARS.wPort]
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| 37 | ret
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[421] | 38 | %endif ; MODULE_ADVANCED_ATA
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[364] | 39 |
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| 40 |
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| 41 | ;--------------------------------------------------------------------
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[421] | 42 | ; AccessDPT_GetDriveSelectByteForOldInt13hToAL
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| 43 | ; AccessDPT_GetDriveSelectByteForEbiosToAL
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[150] | 44 | ; Parameters:
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| 45 | ; DS:DI: Ptr to Disk Parameter Table
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| 46 | ; Returns:
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| 47 | ; AL: Drive Select Byte
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| 48 | ; Corrupts registers:
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| 49 | ; Nothing
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| 50 | ;--------------------------------------------------------------------
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| 51 | ALIGN JUMP_ALIGN
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[421] | 52 | AccessDPT_GetDriveSelectByteForOldInt13hToAL:
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| 53 | mov al, [di+DPT.bFlagsLow]
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| 54 | test al, FLGL_DPT_ASSISTED_LBA
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| 55 | jnz SHORT GetDriveSelectByteForAssistedLBAtoAL
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| 56 |
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| 57 | and al, FLG_DRVNHEAD_DRV ; Clear all but drive select bit
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[150] | 58 | or al, MASK_DRVNHEAD_SET ; Bits set to 1 for old drives
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| 59 | ret
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| 60 |
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[421] | 61 | %ifdef MODULE_EBIOS
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| 62 | ALIGN JUMP_ALIGN
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| 63 | AccessDPT_GetDriveSelectByteForEbiosToAL:
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[443] | 64 | mov al, [di+DPT.bFlagsLow]
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[421] | 65 | ; Fall to GetDriveSelectByteForAssistedLBAtoAL
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| 66 | %endif ; MODULE_EBIOS
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[150] | 67 |
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[421] | 68 | ALIGN JUMP_ALIGN
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| 69 | GetDriveSelectByteForAssistedLBAtoAL:
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| 70 | and al, FLG_DRVNHEAD_DRV ; Master / Slave select
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| 71 | or al, FLG_DRVNHEAD_LBA | MASK_DRVNHEAD_SET
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| 72 | ret
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| 73 |
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| 74 |
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[150] | 75 | ;--------------------------------------------------------------------
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| 76 | ; AccessDPT_GetDeviceControlByteToAL
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| 77 | ; Parameters:
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| 78 | ; DS:DI: Ptr to Disk Parameter Table
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| 79 | ; Returns:
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| 80 | ; AL: Device Control Byte
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| 81 | ; Corrupts registers:
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| 82 | ; Nothing
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| 83 | ;--------------------------------------------------------------------
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| 84 | ALIGN JUMP_ALIGN
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| 85 | AccessDPT_GetDeviceControlByteToAL:
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[411] | 86 | %ifdef MODULE_IRQ
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[150] | 87 | xor al, al
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[158] | 88 | test BYTE [di+DPT.bFlagsLow], FLGL_DPT_ENABLE_IRQ
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[150] | 89 | jnz SHORT .EnableDeviceIrq
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| 90 | or al, FLG_DEVCONTROL_nIEN ; Disable IRQ
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| 91 | .EnableDeviceIrq:
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[411] | 92 | %else
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| 93 | mov al, FLG_DEVCONTROL_nIEN ; Disable IRQ
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| 94 | %endif
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[150] | 95 | ret
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| 96 |
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[227] | 97 |
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[150] | 98 | ;--------------------------------------------------------------------
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[227] | 99 | ; AccessDPT_GetLCHStoAXBLBH
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[3] | 100 | ; Parameters:
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| 101 | ; DS:DI: Ptr to Disk Parameter Table
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| 102 | ; Returns:
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[227] | 103 | ; AX: Number of L-CHS cylinders
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| 104 | ; BL: Number of L-CHS heads
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| 105 | ; BH: Number of L-CHS sectors per track
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[3] | 106 | ; Corrupts registers:
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[421] | 107 | ; Nothing
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[3] | 108 | ;--------------------------------------------------------------------
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[227] | 109 | AccessDPT_GetLCHStoAXBLBH:
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[421] | 110 | mov ax, [di+DPT.wLchsCylinders]
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| 111 | mov bx, [di+DPT.wLchsHeadsAndSectors]
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[227] | 112 | ret
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[173] | 113 |
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[227] | 114 |
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[421] | 115 | %ifdef MODULE_EBIOS
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[227] | 116 | ;--------------------------------------------------------------------
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[230] | 117 | ; AccessDPT_GetLbaSectorCountToBXDXAX
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| 118 | ; Parameters:
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| 119 | ; DS:DI: Ptr to Disk Parameter Table
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| 120 | ; Returns:
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| 121 | ; BX:DX:AX: 48-bit sector count
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| 122 | ; Corrupts registers:
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| 123 | ; Nothing
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| 124 | ;--------------------------------------------------------------------
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| 125 | AccessDPT_GetLbaSectorCountToBXDXAX:
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| 126 | mov ax, [di+DPT.twLbaSectors]
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| 127 | mov dx, [di+DPT.twLbaSectors+2]
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| 128 | mov bx, [di+DPT.twLbaSectors+4]
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| 129 | ret
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[421] | 130 | %endif ; MODULE_EBIOS
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[230] | 131 |
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| 132 |
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| 133 | ;--------------------------------------------------------------------
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[3] | 134 | ; Returns pointer to DRVPARAMS for master or slave drive.
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| 135 | ;
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| 136 | ; AccessDPT_GetPointerToDRVPARAMStoCSBX
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| 137 | ; Parameters:
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| 138 | ; DS:DI: Ptr to Disk Parameter Table
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| 139 | ; Returns:
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| 140 | ; CS:BX: Ptr to DRVPARAMS
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| 141 | ; Corrupts registers:
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| 142 | ; Nothing
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| 143 | ;--------------------------------------------------------------------
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| 144 | ALIGN JUMP_ALIGN
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| 145 | AccessDPT_GetPointerToDRVPARAMStoCSBX:
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[422] | 146 | eMOVZX bx, BYTE [di+DPT.bIdevarsOffset] ; CS:BX points to IDEVARS
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[150] | 147 | add bx, BYTE IDEVARS.drvParamsMaster ; CS:BX points to Master Drive DRVPARAMS
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[158] | 148 | test BYTE [di+DPT.bFlagsLow], FLGL_DPT_SLAVE
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[150] | 149 | jz SHORT .ReturnPointerToDRVPARAMS
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| 150 | add bx, BYTE DRVPARAMS_size ; CS:BX points to Slave Drive DRVPARAMS
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| 151 | .ReturnPointerToDRVPARAMS:
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[3] | 152 | ret
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[200] | 153 |
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[421] | 154 |
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[200] | 155 | ;--------------------------------------------------------------------
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[422] | 156 | ; ACCESSDPT__GET_UNSHIFTED_TRANSLATE_MODE_TO_AXZF
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[200] | 157 | ; Parameters:
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| 158 | ; DS:DI: Ptr to Disk Parameter Table
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| 159 | ; Returns:
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[422] | 160 | ; AX: Translate Mode (TRANSLATEMODE_NORMAL, TRANSLATEMODE_LARGE or TRANSLATEMODE_ASSISTED_LBA)
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[200] | 161 | ; unshifted (still shifted where it is in bFlagsLow)
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| 162 | ; ZF: Set based on value in AL
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| 163 | ; Corrupts registers:
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[421] | 164 | ; Nothing
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[200] | 165 | ;--------------------------------------------------------------------
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[230] | 166 | ;
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| 167 | ; Converted to a macro since only called in two places, and the call/ret overhead
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[200] | 168 | ; is not worth it for these two instructions (4 bytes total)
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| 169 | ;
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[422] | 170 | %macro ACCESSDPT__GET_UNSHIFTED_TRANSLATE_MODE_TO_AXZF 0
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[200] | 171 | mov al, [di+DPT.bFlagsLow]
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[422] | 172 | and ax, BYTE MASKL_DPT_TRANSLATEMODE
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[200] | 173 | %endmacro
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