[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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[491] | 5 | ; XTIDE Universal BIOS and Associated Tools |
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[526] | 6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team. |
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[376] | 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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[491] | 12 | ; |
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[376] | 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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[491] | 16 | ; GNU General Public License for more details. |
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[376] | 17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html |
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[491] | 18 | ; |
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[376] | 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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[542] | 24 | ; AccessDPT_GetDriveSelectByteToAL |
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[150] | 25 | ; Parameters: |
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| 26 | ; DS:DI: Ptr to Disk Parameter Table |
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| 27 | ; Returns: |
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| 28 | ; AL: Drive Select Byte |
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| 29 | ; Corrupts registers: |
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| 30 | ; Nothing |
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| 31 | ;-------------------------------------------------------------------- |
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| 32 | ALIGN JUMP_ALIGN |
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[542] | 33 | AccessDPT_GetDriveSelectByteToAL: |
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[421] | 34 | mov al, [di+DPT.bFlagsLow] |
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[542] | 35 | and al, FLGL_DPT_SLAVE | FLGL_DPT_LBA |
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[150] | 36 | or al, MASK_DRVNHEAD_SET ; Bits set to 1 for old drives |
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| 37 | ret |
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| 38 | |
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| 39 | |
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| 40 | ;-------------------------------------------------------------------- |
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| 41 | ; AccessDPT_GetDeviceControlByteToAL |
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| 42 | ; Parameters: |
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| 43 | ; DS:DI: Ptr to Disk Parameter Table |
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| 44 | ; Returns: |
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| 45 | ; AL: Device Control Byte |
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| 46 | ; Corrupts registers: |
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| 47 | ; Nothing |
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| 48 | ;-------------------------------------------------------------------- |
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| 49 | ALIGN JUMP_ALIGN |
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| 50 | AccessDPT_GetDeviceControlByteToAL: |
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[411] | 51 | %ifdef MODULE_IRQ |
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[491] | 52 | |
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| 53 | %ifndef USE_UNDOC_INTEL |
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[150] | 54 | xor al, al |
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[491] | 55 | %endif |
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| 56 | |
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| 57 | test BYTE [di+DPT.bFlagsLow], FLGL_DPT_ENABLE_IRQ ; Clears CF |
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| 58 | |
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| 59 | %ifdef USE_UNDOC_INTEL |
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| 60 | eSALC ; Clears AL using CF while preserving flags |
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| 61 | %endif |
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| 62 | |
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[150] | 63 | jnz SHORT .EnableDeviceIrq |
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| 64 | or al, FLG_DEVCONTROL_nIEN ; Disable IRQ |
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| 65 | .EnableDeviceIrq: |
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[411] | 66 | %else |
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| 67 | mov al, FLG_DEVCONTROL_nIEN ; Disable IRQ |
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[491] | 68 | %endif ; MODULE_IRQ |
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[150] | 69 | ret |
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| 70 | |
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[227] | 71 | |
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[150] | 72 | ;-------------------------------------------------------------------- |
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[227] | 73 | ; AccessDPT_GetLCHStoAXBLBH |
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[3] | 74 | ; Parameters: |
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| 75 | ; DS:DI: Ptr to Disk Parameter Table |
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| 76 | ; Returns: |
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[227] | 77 | ; AX: Number of L-CHS cylinders |
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| 78 | ; BL: Number of L-CHS heads |
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| 79 | ; BH: Number of L-CHS sectors per track |
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[3] | 80 | ; Corrupts registers: |
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[421] | 81 | ; Nothing |
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[3] | 82 | ;-------------------------------------------------------------------- |
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[227] | 83 | AccessDPT_GetLCHStoAXBLBH: |
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[421] | 84 | mov ax, [di+DPT.wLchsCylinders] |
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| 85 | mov bx, [di+DPT.wLchsHeadsAndSectors] |
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[227] | 86 | ret |
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[173] | 87 | |
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[227] | 88 | |
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[493] | 89 | %ifdef MODULE_8BIT_IDE_ADVANCED |
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[473] | 90 | ;-------------------------------------------------------------------- |
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| 91 | ; AccessDPT_IsThisDeviceXTCF |
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| 92 | ; Parameters: |
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| 93 | ; DS:DI: Ptr to Disk Parameter Table |
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| 94 | ; Returns: |
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| 95 | ; AH: Device Type |
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| 96 | ; ZF: Set if XTCF |
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| 97 | ; Cleared if some other device |
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| 98 | ; Corrupts registers: |
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| 99 | ; Nothing |
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| 100 | ;-------------------------------------------------------------------- |
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| 101 | AccessDPT_IsThisDeviceXTCF: |
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| 102 | mov ah, [di+DPT_ATA.bDevice] |
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| 103 | cmp ah, DEVICE_8BIT_XTCF_PIO8 |
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| 104 | je SHORT .DeviceIsXTCF |
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[545] | 105 | cmp ah, DEVICE_8BIT_XTCF_PIO8_WITH_BIU_OFFLOAD |
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| 106 | je SHORT .DeviceIsXTCF |
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[473] | 107 | cmp ah, DEVICE_8BIT_XTCF_DMA |
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| 108 | .DeviceIsXTCF: |
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| 109 | ret |
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[493] | 110 | %endif ; MODULE_8BIT_IDE_ADVANCED |
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[473] | 111 | |
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| 112 | |
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[421] | 113 | %ifdef MODULE_EBIOS |
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[227] | 114 | ;-------------------------------------------------------------------- |
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[230] | 115 | ; AccessDPT_GetLbaSectorCountToBXDXAX |
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| 116 | ; Parameters: |
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| 117 | ; DS:DI: Ptr to Disk Parameter Table |
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| 118 | ; Returns: |
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| 119 | ; BX:DX:AX: 48-bit sector count |
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| 120 | ; Corrupts registers: |
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| 121 | ; Nothing |
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| 122 | ;-------------------------------------------------------------------- |
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| 123 | AccessDPT_GetLbaSectorCountToBXDXAX: |
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| 124 | mov ax, [di+DPT.twLbaSectors] |
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| 125 | mov dx, [di+DPT.twLbaSectors+2] |
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| 126 | mov bx, [di+DPT.twLbaSectors+4] |
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| 127 | ret |
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[421] | 128 | %endif ; MODULE_EBIOS |
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[230] | 129 | |
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| 130 | |
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| 131 | ;-------------------------------------------------------------------- |
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[3] | 132 | ; Returns pointer to DRVPARAMS for master or slave drive. |
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| 133 | ; |
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| 134 | ; AccessDPT_GetPointerToDRVPARAMStoCSBX |
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| 135 | ; Parameters: |
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| 136 | ; DS:DI: Ptr to Disk Parameter Table |
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| 137 | ; Returns: |
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| 138 | ; CS:BX: Ptr to DRVPARAMS |
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| 139 | ; Corrupts registers: |
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| 140 | ; Nothing |
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| 141 | ;-------------------------------------------------------------------- |
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| 142 | AccessDPT_GetPointerToDRVPARAMStoCSBX: |
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[473] | 143 | call AccessDPT_GetIdevarsToCSBX |
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[150] | 144 | add bx, BYTE IDEVARS.drvParamsMaster ; CS:BX points to Master Drive DRVPARAMS |
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[158] | 145 | test BYTE [di+DPT.bFlagsLow], FLGL_DPT_SLAVE |
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[150] | 146 | jz SHORT .ReturnPointerToDRVPARAMS |
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| 147 | add bx, BYTE DRVPARAMS_size ; CS:BX points to Slave Drive DRVPARAMS |
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| 148 | .ReturnPointerToDRVPARAMS: |
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[3] | 149 | ret |
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[200] | 150 | |
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[421] | 151 | |
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[200] | 152 | ;-------------------------------------------------------------------- |
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[473] | 153 | ; Needed many times during initialization so it is better to |
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| 154 | ; make it as a function to save bytes. |
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| 155 | ; |
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| 156 | ; AccessDPT_GetIdevarsToCSBX |
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| 157 | ; Parameters: |
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| 158 | ; DS:DI: Ptr to Disk Parameter Table |
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| 159 | ; Returns: |
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| 160 | ; CS:BX: Ptr to IDEVARS for the drive |
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| 161 | ; Corrupts registers: |
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| 162 | ; Nothing |
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| 163 | ;-------------------------------------------------------------------- |
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| 164 | AccessDPT_GetIdevarsToCSBX: |
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| 165 | eMOVZX bx, BYTE [di+DPT.bIdevarsOffset] |
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| 166 | ret |
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| 167 | |
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| 168 | |
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| 169 | ;-------------------------------------------------------------------- |
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[422] | 170 | ; ACCESSDPT__GET_UNSHIFTED_TRANSLATE_MODE_TO_AXZF |
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[200] | 171 | ; Parameters: |
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| 172 | ; DS:DI: Ptr to Disk Parameter Table |
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| 173 | ; Returns: |
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[422] | 174 | ; AX: Translate Mode (TRANSLATEMODE_NORMAL, TRANSLATEMODE_LARGE or TRANSLATEMODE_ASSISTED_LBA) |
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[567] | 175 | ; unshifted (still shifted where it is in bFlagsLow) |
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| 176 | ; ZF: Set based on value in AL |
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[200] | 177 | ; Corrupts registers: |
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[421] | 178 | ; Nothing |
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[200] | 179 | ;-------------------------------------------------------------------- |
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[230] | 180 | ; |
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| 181 | ; Converted to a macro since only called in two places, and the call/ret overhead |
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[200] | 182 | ; is not worth it for these two instructions (4 bytes total) |
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| 183 | ; |
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[422] | 184 | %macro ACCESSDPT__GET_UNSHIFTED_TRANSLATE_MODE_TO_AXZF 0 |
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[200] | 185 | mov al, [di+DPT.bFlagsLow] |
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[422] | 186 | and ax, BYTE MASKL_DPT_TRANSLATEMODE |
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[200] | 187 | %endmacro |
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