[99] | 1 | ; Project name : XTIDE Universal BIOS |
---|
[3] | 2 | ; Description : Functions for accessing DPT data. |
---|
| 3 | |
---|
[376] | 4 | ; |
---|
| 5 | ; XTIDE Universal BIOS and Associated Tools |
---|
| 6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2012 by XTIDE Universal BIOS Team. |
---|
| 7 | ; |
---|
| 8 | ; This program is free software; you can redistribute it and/or modify |
---|
| 9 | ; it under the terms of the GNU General Public License as published by |
---|
| 10 | ; the Free Software Foundation; either version 2 of the License, or |
---|
| 11 | ; (at your option) any later version. |
---|
| 12 | ; |
---|
| 13 | ; This program is distributed in the hope that it will be useful, |
---|
| 14 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of |
---|
| 15 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
---|
| 16 | ; GNU General Public License for more details. |
---|
| 17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html |
---|
| 18 | ; |
---|
| 19 | |
---|
[3] | 20 | ; Section containing code |
---|
| 21 | SECTION .text |
---|
| 22 | |
---|
| 23 | ;-------------------------------------------------------------------- |
---|
[421] | 24 | ; AccessDPT_GetDriveSelectByteForOldInt13hToAL |
---|
| 25 | ; AccessDPT_GetDriveSelectByteForEbiosToAL |
---|
[150] | 26 | ; Parameters: |
---|
| 27 | ; DS:DI: Ptr to Disk Parameter Table |
---|
| 28 | ; Returns: |
---|
| 29 | ; AL: Drive Select Byte |
---|
| 30 | ; Corrupts registers: |
---|
| 31 | ; Nothing |
---|
| 32 | ;-------------------------------------------------------------------- |
---|
| 33 | ALIGN JUMP_ALIGN |
---|
[421] | 34 | AccessDPT_GetDriveSelectByteForOldInt13hToAL: |
---|
| 35 | mov al, [di+DPT.bFlagsLow] |
---|
| 36 | test al, FLGL_DPT_ASSISTED_LBA |
---|
| 37 | jnz SHORT GetDriveSelectByteForAssistedLBAtoAL |
---|
| 38 | |
---|
| 39 | and al, FLG_DRVNHEAD_DRV ; Clear all but drive select bit |
---|
[150] | 40 | or al, MASK_DRVNHEAD_SET ; Bits set to 1 for old drives |
---|
| 41 | ret |
---|
| 42 | |
---|
[421] | 43 | %ifdef MODULE_EBIOS |
---|
| 44 | ALIGN JUMP_ALIGN |
---|
| 45 | AccessDPT_GetDriveSelectByteForEbiosToAL: |
---|
[443] | 46 | mov al, [di+DPT.bFlagsLow] |
---|
[421] | 47 | ; Fall to GetDriveSelectByteForAssistedLBAtoAL |
---|
| 48 | %endif ; MODULE_EBIOS |
---|
[150] | 49 | |
---|
[421] | 50 | ALIGN JUMP_ALIGN |
---|
| 51 | GetDriveSelectByteForAssistedLBAtoAL: |
---|
| 52 | and al, FLG_DRVNHEAD_DRV ; Master / Slave select |
---|
| 53 | or al, FLG_DRVNHEAD_LBA | MASK_DRVNHEAD_SET |
---|
| 54 | ret |
---|
| 55 | |
---|
| 56 | |
---|
[150] | 57 | ;-------------------------------------------------------------------- |
---|
| 58 | ; AccessDPT_GetDeviceControlByteToAL |
---|
| 59 | ; Parameters: |
---|
| 60 | ; DS:DI: Ptr to Disk Parameter Table |
---|
| 61 | ; Returns: |
---|
| 62 | ; AL: Device Control Byte |
---|
| 63 | ; Corrupts registers: |
---|
| 64 | ; Nothing |
---|
| 65 | ;-------------------------------------------------------------------- |
---|
| 66 | ALIGN JUMP_ALIGN |
---|
| 67 | AccessDPT_GetDeviceControlByteToAL: |
---|
[411] | 68 | %ifdef MODULE_IRQ |
---|
[150] | 69 | xor al, al |
---|
[158] | 70 | test BYTE [di+DPT.bFlagsLow], FLGL_DPT_ENABLE_IRQ |
---|
[150] | 71 | jnz SHORT .EnableDeviceIrq |
---|
| 72 | or al, FLG_DEVCONTROL_nIEN ; Disable IRQ |
---|
| 73 | .EnableDeviceIrq: |
---|
[411] | 74 | %else |
---|
| 75 | mov al, FLG_DEVCONTROL_nIEN ; Disable IRQ |
---|
| 76 | %endif |
---|
[150] | 77 | ret |
---|
| 78 | |
---|
[227] | 79 | |
---|
[150] | 80 | ;-------------------------------------------------------------------- |
---|
[227] | 81 | ; AccessDPT_GetLCHStoAXBLBH |
---|
[3] | 82 | ; Parameters: |
---|
| 83 | ; DS:DI: Ptr to Disk Parameter Table |
---|
| 84 | ; Returns: |
---|
[227] | 85 | ; AX: Number of L-CHS cylinders |
---|
| 86 | ; BL: Number of L-CHS heads |
---|
| 87 | ; BH: Number of L-CHS sectors per track |
---|
[3] | 88 | ; Corrupts registers: |
---|
[421] | 89 | ; Nothing |
---|
[3] | 90 | ;-------------------------------------------------------------------- |
---|
[227] | 91 | AccessDPT_GetLCHStoAXBLBH: |
---|
[421] | 92 | mov ax, [di+DPT.wLchsCylinders] |
---|
| 93 | mov bx, [di+DPT.wLchsHeadsAndSectors] |
---|
[227] | 94 | ret |
---|
[173] | 95 | |
---|
[227] | 96 | |
---|
[473] | 97 | %ifdef MODULE_8BIT_IDE |
---|
| 98 | ;-------------------------------------------------------------------- |
---|
| 99 | ; AccessDPT_IsThisDeviceXTCF |
---|
| 100 | ; Parameters: |
---|
| 101 | ; DS:DI: Ptr to Disk Parameter Table |
---|
| 102 | ; Returns: |
---|
| 103 | ; AH: Device Type |
---|
| 104 | ; ZF: Set if XTCF |
---|
| 105 | ; Cleared if some other device |
---|
| 106 | ; Corrupts registers: |
---|
| 107 | ; Nothing |
---|
| 108 | ;-------------------------------------------------------------------- |
---|
| 109 | AccessDPT_IsThisDeviceXTCF: |
---|
| 110 | mov ah, [di+DPT_ATA.bDevice] |
---|
| 111 | cmp ah, DEVICE_8BIT_XTCF_PIO8 |
---|
| 112 | je SHORT .DeviceIsXTCF |
---|
| 113 | cmp ah, DEVICE_8BIT_XTCF_DMA |
---|
| 114 | je SHORT .DeviceIsXTCF |
---|
| 115 | cmp ah, DEVICE_8BIT_XTCF_MEMMAP |
---|
| 116 | .DeviceIsXTCF: |
---|
| 117 | ret |
---|
| 118 | %endif ; MODULE_8BIT_IDE |
---|
| 119 | |
---|
| 120 | |
---|
[421] | 121 | %ifdef MODULE_EBIOS |
---|
[227] | 122 | ;-------------------------------------------------------------------- |
---|
[230] | 123 | ; AccessDPT_GetLbaSectorCountToBXDXAX |
---|
| 124 | ; Parameters: |
---|
| 125 | ; DS:DI: Ptr to Disk Parameter Table |
---|
| 126 | ; Returns: |
---|
| 127 | ; BX:DX:AX: 48-bit sector count |
---|
| 128 | ; Corrupts registers: |
---|
| 129 | ; Nothing |
---|
| 130 | ;-------------------------------------------------------------------- |
---|
| 131 | AccessDPT_GetLbaSectorCountToBXDXAX: |
---|
| 132 | mov ax, [di+DPT.twLbaSectors] |
---|
| 133 | mov dx, [di+DPT.twLbaSectors+2] |
---|
| 134 | mov bx, [di+DPT.twLbaSectors+4] |
---|
| 135 | ret |
---|
[421] | 136 | %endif ; MODULE_EBIOS |
---|
[230] | 137 | |
---|
| 138 | |
---|
| 139 | ;-------------------------------------------------------------------- |
---|
[3] | 140 | ; Returns pointer to DRVPARAMS for master or slave drive. |
---|
| 141 | ; |
---|
| 142 | ; AccessDPT_GetPointerToDRVPARAMStoCSBX |
---|
| 143 | ; Parameters: |
---|
| 144 | ; DS:DI: Ptr to Disk Parameter Table |
---|
| 145 | ; Returns: |
---|
| 146 | ; CS:BX: Ptr to DRVPARAMS |
---|
| 147 | ; Corrupts registers: |
---|
| 148 | ; Nothing |
---|
| 149 | ;-------------------------------------------------------------------- |
---|
| 150 | AccessDPT_GetPointerToDRVPARAMStoCSBX: |
---|
[473] | 151 | call AccessDPT_GetIdevarsToCSBX |
---|
[150] | 152 | add bx, BYTE IDEVARS.drvParamsMaster ; CS:BX points to Master Drive DRVPARAMS |
---|
[158] | 153 | test BYTE [di+DPT.bFlagsLow], FLGL_DPT_SLAVE |
---|
[150] | 154 | jz SHORT .ReturnPointerToDRVPARAMS |
---|
| 155 | add bx, BYTE DRVPARAMS_size ; CS:BX points to Slave Drive DRVPARAMS |
---|
| 156 | .ReturnPointerToDRVPARAMS: |
---|
[3] | 157 | ret |
---|
[200] | 158 | |
---|
[421] | 159 | |
---|
[200] | 160 | ;-------------------------------------------------------------------- |
---|
[473] | 161 | ; Needed many times during initialization so it is better to |
---|
| 162 | ; make it as a function to save bytes. |
---|
| 163 | ; |
---|
| 164 | ; AccessDPT_GetIdevarsToCSBX |
---|
| 165 | ; Parameters: |
---|
| 166 | ; DS:DI: Ptr to Disk Parameter Table |
---|
| 167 | ; Returns: |
---|
| 168 | ; CS:BX: Ptr to IDEVARS for the drive |
---|
| 169 | ; Corrupts registers: |
---|
| 170 | ; Nothing |
---|
| 171 | ;-------------------------------------------------------------------- |
---|
| 172 | AccessDPT_GetIdevarsToCSBX: |
---|
| 173 | eMOVZX bx, BYTE [di+DPT.bIdevarsOffset] |
---|
| 174 | ret |
---|
| 175 | |
---|
| 176 | |
---|
| 177 | ;-------------------------------------------------------------------- |
---|
[422] | 178 | ; ACCESSDPT__GET_UNSHIFTED_TRANSLATE_MODE_TO_AXZF |
---|
[200] | 179 | ; Parameters: |
---|
| 180 | ; DS:DI: Ptr to Disk Parameter Table |
---|
| 181 | ; Returns: |
---|
[422] | 182 | ; AX: Translate Mode (TRANSLATEMODE_NORMAL, TRANSLATEMODE_LARGE or TRANSLATEMODE_ASSISTED_LBA) |
---|
[200] | 183 | ; unshifted (still shifted where it is in bFlagsLow) |
---|
| 184 | ; ZF: Set based on value in AL |
---|
| 185 | ; Corrupts registers: |
---|
[421] | 186 | ; Nothing |
---|
[200] | 187 | ;-------------------------------------------------------------------- |
---|
[230] | 188 | ; |
---|
| 189 | ; Converted to a macro since only called in two places, and the call/ret overhead |
---|
[200] | 190 | ; is not worth it for these two instructions (4 bytes total) |
---|
| 191 | ; |
---|
[422] | 192 | %macro ACCESSDPT__GET_UNSHIFTED_TRANSLATE_MODE_TO_AXZF 0 |
---|
[200] | 193 | mov al, [di+DPT.bFlagsLow] |
---|
[422] | 194 | and ax, BYTE MASKL_DPT_TRANSLATEMODE |
---|
[200] | 195 | %endmacro |
---|