[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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[376] | 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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[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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[421] | 24 | ; AccessDPT_GetDriveSelectByteForOldInt13hToAL |
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| 25 | ; AccessDPT_GetDriveSelectByteForEbiosToAL |
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[150] | 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 | ; AL: Drive Select Byte |
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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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[421] | 34 | AccessDPT_GetDriveSelectByteForOldInt13hToAL: |
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| 35 | mov al, [di+DPT.bFlagsLow] |
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| 36 | test al, FLGL_DPT_ASSISTED_LBA |
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| 37 | jnz SHORT GetDriveSelectByteForAssistedLBAtoAL |
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| 38 | |
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| 39 | and al, FLG_DRVNHEAD_DRV ; Clear all but drive select bit |
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[150] | 40 | or al, MASK_DRVNHEAD_SET ; Bits set to 1 for old drives |
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| 41 | ret |
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| 42 | |
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[421] | 43 | %ifdef MODULE_EBIOS |
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| 44 | ALIGN JUMP_ALIGN |
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| 45 | AccessDPT_GetDriveSelectByteForEbiosToAL: |
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[443] | 46 | mov al, [di+DPT.bFlagsLow] |
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[421] | 47 | ; Fall to GetDriveSelectByteForAssistedLBAtoAL |
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| 48 | %endif ; MODULE_EBIOS |
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[150] | 49 | |
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[421] | 50 | ALIGN JUMP_ALIGN |
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| 51 | GetDriveSelectByteForAssistedLBAtoAL: |
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| 52 | and al, FLG_DRVNHEAD_DRV ; Master / Slave select |
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| 53 | or al, FLG_DRVNHEAD_LBA | MASK_DRVNHEAD_SET |
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| 54 | ret |
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| 55 | |
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| 56 | |
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[150] | 57 | ;-------------------------------------------------------------------- |
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| 58 | ; AccessDPT_GetDeviceControlByteToAL |
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| 59 | ; Parameters: |
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| 60 | ; DS:DI: Ptr to Disk Parameter Table |
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| 61 | ; Returns: |
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| 62 | ; AL: Device Control Byte |
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| 63 | ; Corrupts registers: |
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| 64 | ; Nothing |
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| 65 | ;-------------------------------------------------------------------- |
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| 66 | ALIGN JUMP_ALIGN |
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| 67 | AccessDPT_GetDeviceControlByteToAL: |
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[411] | 68 | %ifdef MODULE_IRQ |
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[491] | 69 | |
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| 70 | %ifndef USE_UNDOC_INTEL |
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[150] | 71 | xor al, al |
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[491] | 72 | %endif |
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| 73 | |
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| 74 | test BYTE [di+DPT.bFlagsLow], FLGL_DPT_ENABLE_IRQ ; Clears CF |
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| 75 | |
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| 76 | %ifdef USE_UNDOC_INTEL |
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| 77 | eSALC ; Clears AL using CF while preserving flags |
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| 78 | %endif |
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| 79 | |
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[150] | 80 | jnz SHORT .EnableDeviceIrq |
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| 81 | or al, FLG_DEVCONTROL_nIEN ; Disable IRQ |
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| 82 | .EnableDeviceIrq: |
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[411] | 83 | %else |
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| 84 | mov al, FLG_DEVCONTROL_nIEN ; Disable IRQ |
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[491] | 85 | %endif ; MODULE_IRQ |
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[150] | 86 | ret |
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| 87 | |
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[227] | 88 | |
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[150] | 89 | ;-------------------------------------------------------------------- |
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[227] | 90 | ; AccessDPT_GetLCHStoAXBLBH |
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[3] | 91 | ; Parameters: |
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| 92 | ; DS:DI: Ptr to Disk Parameter Table |
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| 93 | ; Returns: |
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[227] | 94 | ; AX: Number of L-CHS cylinders |
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| 95 | ; BL: Number of L-CHS heads |
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| 96 | ; BH: Number of L-CHS sectors per track |
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[3] | 97 | ; Corrupts registers: |
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[421] | 98 | ; Nothing |
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[3] | 99 | ;-------------------------------------------------------------------- |
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[227] | 100 | AccessDPT_GetLCHStoAXBLBH: |
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[421] | 101 | mov ax, [di+DPT.wLchsCylinders] |
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| 102 | mov bx, [di+DPT.wLchsHeadsAndSectors] |
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[227] | 103 | ret |
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[173] | 104 | |
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[227] | 105 | |
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[493] | 106 | %ifdef MODULE_8BIT_IDE_ADVANCED |
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[473] | 107 | ;-------------------------------------------------------------------- |
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| 108 | ; AccessDPT_IsThisDeviceXTCF |
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| 109 | ; Parameters: |
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| 110 | ; DS:DI: Ptr to Disk Parameter Table |
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| 111 | ; Returns: |
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| 112 | ; AH: Device Type |
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| 113 | ; ZF: Set if XTCF |
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| 114 | ; Cleared if some other device |
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| 115 | ; Corrupts registers: |
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| 116 | ; Nothing |
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| 117 | ;-------------------------------------------------------------------- |
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| 118 | AccessDPT_IsThisDeviceXTCF: |
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| 119 | mov ah, [di+DPT_ATA.bDevice] |
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| 120 | cmp ah, DEVICE_8BIT_XTCF_PIO8 |
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| 121 | je SHORT .DeviceIsXTCF |
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| 122 | cmp ah, DEVICE_8BIT_XTCF_DMA |
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| 123 | je SHORT .DeviceIsXTCF |
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| 124 | cmp ah, DEVICE_8BIT_XTCF_MEMMAP |
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| 125 | .DeviceIsXTCF: |
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| 126 | ret |
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[493] | 127 | %endif ; MODULE_8BIT_IDE_ADVANCED |
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[473] | 128 | |
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| 129 | |
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[421] | 130 | %ifdef MODULE_EBIOS |
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[227] | 131 | ;-------------------------------------------------------------------- |
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[230] | 132 | ; AccessDPT_GetLbaSectorCountToBXDXAX |
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| 133 | ; Parameters: |
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| 134 | ; DS:DI: Ptr to Disk Parameter Table |
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| 135 | ; Returns: |
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| 136 | ; BX:DX:AX: 48-bit sector count |
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| 137 | ; Corrupts registers: |
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| 138 | ; Nothing |
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| 139 | ;-------------------------------------------------------------------- |
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| 140 | AccessDPT_GetLbaSectorCountToBXDXAX: |
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| 141 | mov ax, [di+DPT.twLbaSectors] |
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| 142 | mov dx, [di+DPT.twLbaSectors+2] |
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| 143 | mov bx, [di+DPT.twLbaSectors+4] |
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| 144 | ret |
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[421] | 145 | %endif ; MODULE_EBIOS |
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[230] | 146 | |
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| 147 | |
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| 148 | ;-------------------------------------------------------------------- |
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[3] | 149 | ; Returns pointer to DRVPARAMS for master or slave drive. |
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| 150 | ; |
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| 151 | ; AccessDPT_GetPointerToDRVPARAMStoCSBX |
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| 152 | ; Parameters: |
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| 153 | ; DS:DI: Ptr to Disk Parameter Table |
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| 154 | ; Returns: |
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| 155 | ; CS:BX: Ptr to DRVPARAMS |
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| 156 | ; Corrupts registers: |
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| 157 | ; Nothing |
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| 158 | ;-------------------------------------------------------------------- |
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| 159 | AccessDPT_GetPointerToDRVPARAMStoCSBX: |
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[473] | 160 | call AccessDPT_GetIdevarsToCSBX |
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[150] | 161 | add bx, BYTE IDEVARS.drvParamsMaster ; CS:BX points to Master Drive DRVPARAMS |
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[158] | 162 | test BYTE [di+DPT.bFlagsLow], FLGL_DPT_SLAVE |
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[150] | 163 | jz SHORT .ReturnPointerToDRVPARAMS |
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| 164 | add bx, BYTE DRVPARAMS_size ; CS:BX points to Slave Drive DRVPARAMS |
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| 165 | .ReturnPointerToDRVPARAMS: |
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[3] | 166 | ret |
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[200] | 167 | |
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[421] | 168 | |
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[200] | 169 | ;-------------------------------------------------------------------- |
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[473] | 170 | ; Needed many times during initialization so it is better to |
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| 171 | ; make it as a function to save bytes. |
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| 172 | ; |
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| 173 | ; AccessDPT_GetIdevarsToCSBX |
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| 174 | ; Parameters: |
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| 175 | ; DS:DI: Ptr to Disk Parameter Table |
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| 176 | ; Returns: |
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| 177 | ; CS:BX: Ptr to IDEVARS for the drive |
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| 178 | ; Corrupts registers: |
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| 179 | ; Nothing |
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| 180 | ;-------------------------------------------------------------------- |
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| 181 | AccessDPT_GetIdevarsToCSBX: |
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| 182 | eMOVZX bx, BYTE [di+DPT.bIdevarsOffset] |
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| 183 | ret |
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| 184 | |
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| 185 | |
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| 186 | ;-------------------------------------------------------------------- |
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[422] | 187 | ; ACCESSDPT__GET_UNSHIFTED_TRANSLATE_MODE_TO_AXZF |
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[200] | 188 | ; Parameters: |
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| 189 | ; DS:DI: Ptr to Disk Parameter Table |
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| 190 | ; Returns: |
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[422] | 191 | ; AX: Translate Mode (TRANSLATEMODE_NORMAL, TRANSLATEMODE_LARGE or TRANSLATEMODE_ASSISTED_LBA) |
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[200] | 192 | ; unshifted (still shifted where it is in bFlagsLow) |
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| 193 | ; ZF: Set based on value in AL |
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| 194 | ; Corrupts registers: |
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[421] | 195 | ; Nothing |
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[200] | 196 | ;-------------------------------------------------------------------- |
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[230] | 197 | ; |
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| 198 | ; Converted to a macro since only called in two places, and the call/ret overhead |
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[200] | 199 | ; is not worth it for these two instructions (4 bytes total) |
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| 200 | ; |
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[422] | 201 | %macro ACCESSDPT__GET_UNSHIFTED_TRANSLATE_MODE_TO_AXZF 0 |
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[200] | 202 | mov al, [di+DPT.bFlagsLow] |
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[422] | 203 | and ax, BYTE MASKL_DPT_TRANSLATEMODE |
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[200] | 204 | %endmacro |
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