[99] | 1 | ; Project name : XTIDE Universal BIOS |
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[3] | 2 | ; Description : Functions for creating Disk Parameter Table. |
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| 3 | |
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[376] | 4 | ; |
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[445] | 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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[445] | 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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[445] | 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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[445] | 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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| 24 | ; Creates new Disk Parameter Table for detected hard disk. |
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| 25 | ; Drive is then fully accessible using any BIOS function. |
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| 26 | ; |
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| 27 | ; CreateDPT_FromAtaInformation |
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| 28 | ; Parameters: |
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| 29 | ; BH: Drive Select byte for Drive and Head Register |
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| 30 | ; ES:SI: Ptr to 512-byte ATA information read from the drive |
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| 31 | ; CS:BP: Ptr to IDEVARS for the controller |
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| 32 | ; DS: RAMVARS segment |
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| 33 | ; ES: BDA Segment |
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| 34 | ; Returns: |
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[294] | 35 | ; DS:DI: Ptr to Disk Parameter Table (if successful) |
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[3] | 36 | ; CF: Cleared if DPT created successfully |
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| 37 | ; Set if any error |
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| 38 | ; Corrupts registers: |
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[99] | 39 | ; AX, BX, CX, DH |
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[3] | 40 | ;-------------------------------------------------------------------- |
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| 41 | CreateDPT_FromAtaInformation: |
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[150] | 42 | call FindDPT_ForNewDriveToDSDI |
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[99] | 43 | ; Fall to .InitializeDPT |
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[3] | 44 | |
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| 45 | ;-------------------------------------------------------------------- |
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[99] | 46 | ; .InitializeDPT |
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[3] | 47 | ; Parameters: |
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| 48 | ; BH: Drive Select byte for Drive and Head Register |
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| 49 | ; DS:DI: Ptr to Disk Parameter Table |
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| 50 | ; CS:BP: Ptr to IDEVARS for the controller |
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| 51 | ; Returns: |
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[150] | 52 | ; Nothing |
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[3] | 53 | ; Corrupts registers: |
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[150] | 54 | ; AX |
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[3] | 55 | ;-------------------------------------------------------------------- |
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[99] | 56 | .InitializeDPT: |
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[422] | 57 | mov [di+DPT.bIdevarsOffset], bp ; IDEVARS must start in first 256 bytes of ROM |
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[150] | 58 | ; Fall to .StoreDriveSelectAndDriveControlByte |
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[3] | 59 | |
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| 60 | ;-------------------------------------------------------------------- |
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[150] | 61 | ; .StoreDriveSelectAndDriveControlByte |
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[3] | 62 | ; Parameters: |
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| 63 | ; BH: Drive Select byte for Drive and Head Register |
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| 64 | ; DS:DI: Ptr to Disk Parameter Table |
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| 65 | ; ES:SI: Ptr to 512-byte ATA information read from the drive |
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| 66 | ; CS:BP: Ptr to IDEVARS for the controller |
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| 67 | ; Returns: |
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[99] | 68 | ; Nothing |
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[3] | 69 | ; Corrupts registers: |
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| 70 | ; AX |
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| 71 | ;-------------------------------------------------------------------- |
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[150] | 72 | .StoreDriveSelectAndDriveControlByte: |
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| 73 | mov al, bh |
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| 74 | and ax, BYTE FLG_DRVNHEAD_DRV ; AL now has Master/Slave bit |
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[411] | 75 | %ifdef MODULE_IRQ |
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[150] | 76 | cmp [cs:bp+IDEVARS.bIRQ], ah ; Interrupts enabled? |
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| 77 | jz SHORT .StoreFlags ; If not, do not set interrupt flag |
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[158] | 78 | or al, FLGL_DPT_ENABLE_IRQ |
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[150] | 79 | .StoreFlags: |
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[411] | 80 | %endif |
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[150] | 81 | mov [di+DPT.wFlags], ax |
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[421] | 82 | ; Fall to .StoreCHSparametersAndAddressingMode |
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[3] | 83 | |
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| 84 | ;-------------------------------------------------------------------- |
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[421] | 85 | ; .StoreCHSparametersAndAddressingMode |
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[3] | 86 | ; Parameters: |
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| 87 | ; DS:DI: Ptr to Disk Parameter Table |
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| 88 | ; ES:SI: Ptr to 512-byte ATA information read from the drive |
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| 89 | ; CS:BP: Ptr to IDEVARS for the controller |
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| 90 | ; Returns: |
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[227] | 91 | ; Nothing |
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[3] | 92 | ; Corrupts registers: |
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[227] | 93 | ; AX, BX, CX, DX |
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[3] | 94 | ;-------------------------------------------------------------------- |
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[421] | 95 | .StoreCHSparametersAndAddressingMode: |
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[173] | 96 | ; Check if CHS defined in ROMVARS |
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[422] | 97 | call GetUserDefinedCapacityToBXAXandFlagsToCXandModeToDXfromROMVARS |
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| 98 | test cl, FLG_DRVPARAMS_USERCHS |
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[421] | 99 | jz SHORT .AutodetectPCHSvalues |
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[173] | 100 | |
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[422] | 101 | ; Translate P-CHS to L-CHS |
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| 102 | call AtaGeometry_GetLCHStoAXBLBHfromPCHSinAXBLBHandTranslateModeInDX |
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[421] | 103 | jmp SHORT .StoreLCHStoDPT |
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| 104 | .AutodetectPCHSvalues: |
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[422] | 105 | call AtaGeometry_GetLCHStoAXBLBHfromAtaInfoInESSIandTranslateModeInDX |
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[421] | 106 | |
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| 107 | .StoreLCHStoDPT: |
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[422] | 108 | eSHL_IM dl, TRANSLATEMODE_FIELD_POSITION |
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[421] | 109 | or cl, dl |
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| 110 | or [di+DPT.bFlagsLow], cl ; Shift count and addressing mode |
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| 111 | mov [di+DPT.wLchsCylinders], ax |
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| 112 | mov [di+DPT.wLchsHeadsAndSectors], bx |
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| 113 | |
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| 114 | ; Store P-CHS to DPT |
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| 115 | call AtaGeometry_GetPCHStoAXBLBHfromAtaInfoInESSI |
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| 116 | mov [di+DPT.bPchsHeads], bl |
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| 117 | %ifdef MODULE_EBIOS |
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| 118 | mov [di+DPT.wPchsCylinders], ax |
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| 119 | mov [di+DPT.bPchsSectorsPerTrack], bh |
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| 120 | ; Fall to .StoreNumberOfLbaSectors |
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| 121 | |
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| 122 | ;-------------------------------------------------------------------- |
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| 123 | ; .StoreNumberOfLbaSectors |
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| 124 | ; Parameters: |
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| 125 | ; DS:DI: Ptr to Disk Parameter Table |
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| 126 | ; ES:SI: Ptr to 512-byte ATA information read from the drive |
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| 127 | ; CS:BP: Ptr to IDEVARS for the controller |
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| 128 | ; Returns: |
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| 129 | ; Nothing |
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| 130 | ; Corrupts registers: |
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| 131 | ; AX, BX, CX, DX |
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| 132 | ;-------------------------------------------------------------------- |
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[173] | 133 | ; Check if LBA supported |
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| 134 | test BYTE [es:si+ATA1.wCaps+1], A1_wCaps_LBA>>8 |
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[421] | 135 | jz SHORT .NoLbaSupportedSoNoEBIOS |
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[3] | 136 | |
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[421] | 137 | ; Store LBA 28/48 total sector count |
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| 138 | call AtaGeometry_GetLbaSectorCountToBXDXAXfromAtaInfoInESSI |
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| 139 | call StoreLba48AddressingFromCLandTotalSectorCountFromBXDXAX |
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[324] | 140 | |
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[421] | 141 | ; Load user defined LBA |
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[422] | 142 | call GetUserDefinedCapacityToBXAXandFlagsToCXandModeToDXfromROMVARS |
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| 143 | test cl, FLG_DRVPARAMS_USERLBA |
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[324] | 144 | jz SHORT .KeepTotalSectorsFromAtaID |
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| 145 | |
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| 146 | ; Compare user defined and ATA-ID sector count and select smaller |
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[445] | 147 | mov dx, bx |
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| 148 | xor bx, bx ; User defined LBA now in BX:DX:AX |
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[324] | 149 | cmp bx, [di+DPT.twLbaSectors+4] |
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| 150 | jb SHORT .StoreUserDefinedSectorCountToDPT |
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| 151 | cmp dx, [di+DPT.twLbaSectors+2] |
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| 152 | jb SHORT .StoreUserDefinedSectorCountToDPT |
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| 153 | ja SHORT .KeepTotalSectorsFromAtaID |
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| 154 | cmp ax, [di+DPT.twLbaSectors] |
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| 155 | jae SHORT .KeepTotalSectorsFromAtaID |
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| 156 | .StoreUserDefinedSectorCountToDPT: |
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[422] | 157 | ; CL bit FLGL_DPT_LBA48 is clear at this point |
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[421] | 158 | call StoreLba48AddressingFromCLandTotalSectorCountFromBXDXAX |
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[324] | 159 | |
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| 160 | .KeepTotalSectorsFromAtaID: |
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[421] | 161 | .NoLbaSupportedSoNoEBIOS: |
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| 162 | %endif ; MODULE_EBIOS |
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[99] | 163 | ; Fall to .StoreBlockMode |
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[3] | 164 | |
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| 165 | ;-------------------------------------------------------------------- |
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[99] | 166 | ; .StoreBlockMode |
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[3] | 167 | ; Parameters: |
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| 168 | ; DS:DI: Ptr to Disk Parameter Table |
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| 169 | ; ES:SI: Ptr to 512-byte ATA information read from the drive |
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[160] | 170 | ; CS:BP: Ptr to IDEVARS for the controller |
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[3] | 171 | ; Returns: |
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[99] | 172 | ; Nothing |
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[3] | 173 | ; Corrupts registers: |
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[150] | 174 | ; Nothing |
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[3] | 175 | ;-------------------------------------------------------------------- |
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[99] | 176 | .StoreBlockMode: |
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[150] | 177 | cmp BYTE [es:si+ATA1.bBlckSize], 1 ; Max block size in sectors |
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| 178 | jbe SHORT .BlockModeTransfersNotSupported |
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[158] | 179 | or BYTE [di+DPT.bFlagsHigh], FLGH_DPT_BLOCK_MODE_SUPPORTED |
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[150] | 180 | .BlockModeTransfersNotSupported: |
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| 181 | ; Fall to .StoreDeviceSpecificParameters |
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[3] | 182 | |
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| 183 | ;-------------------------------------------------------------------- |
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[150] | 184 | ; .StoreDeviceSpecificParameters |
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[3] | 185 | ; Parameters: |
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| 186 | ; DS:DI: Ptr to Disk Parameter Table |
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| 187 | ; ES:SI: Ptr to 512-byte ATA information read from the drive |
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[160] | 188 | ; CS:BP: Ptr to IDEVARS for the controller |
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[3] | 189 | ; Returns: |
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[99] | 190 | ; Nothing |
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[3] | 191 | ; Corrupts registers: |
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[150] | 192 | ; AX, BX, CX, DX |
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[3] | 193 | ;-------------------------------------------------------------------- |
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[150] | 194 | .StoreDeviceSpecificParameters: |
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| 195 | call Device_FinalizeDPT |
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[258] | 196 | |
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[262] | 197 | ;---------------------------------------------------------------------- |
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| 198 | ; Update drive counts (hard and floppy) |
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[294] | 199 | ;---------------------------------------------------------------------- |
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| 200 | |
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[258] | 201 | %ifdef MODULE_SERIAL_FLOPPY |
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| 202 | ; |
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| 203 | ; These two instructions serve two purposes: |
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| 204 | ; 1. If the drive is a floppy drive (CF set), then we effectively increment the counter. |
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[294] | 205 | ; 2. If this is a hard disk, and there have been any floppy drives previously added, then the hard disk is |
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[258] | 206 | ; effectively discarded. This is more of a safety check then code that should ever normally be hit (see below). |
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[294] | 207 | ; Since the floppy DPT's come after the hard disk DPT's, without expensive (code size) code to relocate a DPT, |
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[258] | 208 | ; this was necessary. Now, this situation shouldn't happen in normal operation, for a couple of reasons: |
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[294] | 209 | ; A. xtidecfg always puts configured serial ports at the end of the IDEVARS list |
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[258] | 210 | ; B. the auto serial code is always executed last |
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| 211 | ; C. the serial server always returns floppy drives last |
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| 212 | ; |
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| 213 | adc byte [RAMVARS.xlateVars+XLATEVARS.bFlopCreateCnt], 0 |
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[294] | 214 | jnz .AllDone |
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[258] | 215 | %else |
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| 216 | ; |
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| 217 | ; Even without floppy support enabled, we shouldn't try to mount a floppy image as a hard disk, which |
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[294] | 218 | ; could lead to unpredictable results since no MBR will be present, etc. The server doesn't know that |
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[258] | 219 | ; floppies are supported, so it is important to still fail here if a floppy is seen during the drive scan. |
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| 220 | ; |
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| 221 | jc .AllDone |
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| 222 | %endif |
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| 223 | |
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[150] | 224 | inc BYTE [RAMVARS.bDrvCnt] ; Increment drive count to RAMVARS |
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[294] | 225 | |
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| 226 | .AllDone: |
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[162] | 227 | clc |
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[3] | 228 | ret |
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[258] | 229 | |
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[324] | 230 | |
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[422] | 231 | ;-------------------------------------------------------------------- |
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| 232 | ; GetUserDefinedCapacityToBXAXandFlagsToCXandModeToDXfromROMVARS |
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| 233 | ; Parameters: |
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| 234 | ; DS:DI: Ptr to Disk Parameter Table |
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| 235 | ; Returns: |
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| 236 | ; AX: User defined P-CHS Cylinders or LBA low word |
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| 237 | ; BX: User defined P-CHS Heads and Sectors or LBA high word |
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| 238 | ; DX: Translate mode or TRANSLATEMODE_AUTO |
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| 239 | ; CX: FLG_DRVPARAMS_USERCHS if user defined CHS in BX:AX |
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| 240 | ; FLG_DRVPARAMS_USERLBA if user defined LBA in BX:AX |
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| 241 | ; Zero if user has not defined capacity |
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| 242 | ; Corrupts registers: |
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| 243 | ; Nothing |
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| 244 | ;-------------------------------------------------------------------- |
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| 245 | GetUserDefinedCapacityToBXAXandFlagsToCXandModeToDXfromROMVARS: |
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| 246 | call AccessDPT_GetPointerToDRVPARAMStoCSBX |
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| 247 | |
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| 248 | ; Get settings |
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| 249 | mov cx, [cs:bx+DRVPARAMS.wFlags] |
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| 250 | mov dx, cx |
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| 251 | and cx, BYTE FLG_DRVPARAMS_USERCHS | FLG_DRVPARAMS_USERLBA |
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| 252 | and dx, BYTE MASK_DRVPARAMS_TRANSLATEMODE |
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| 253 | eSHR_IM dx, TRANSLATEMODE_FIELD_POSITION |
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| 254 | |
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| 255 | ; Get capacity |
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| 256 | mov ax, [cs:bx+DRVPARAMS.wCylinders] ; Or .dwMaximumLBA |
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| 257 | mov bx, [cs:bx+DRVPARAMS.wHeadsAndSectors] ; Or .dwMaximumLBA+2 |
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| 258 | ret |
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| 259 | |
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| 260 | |
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[421] | 261 | %ifdef MODULE_EBIOS |
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[324] | 262 | ;-------------------------------------------------------------------- |
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[421] | 263 | ; StoreLba48AddressingFromCLandTotalSectorCountFromBXDXAX |
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[324] | 264 | ; Parameters: |
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| 265 | ; BX:DX:AX: Total Sector Count |
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[421] | 266 | ; CL: FLGL_DPT_LBA48 if LBA48 supported |
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[324] | 267 | ; DS:DI: Ptr to Disk Parameter Table |
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| 268 | ; Returns: |
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| 269 | ; Nothing |
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| 270 | ; Corrupts registers: |
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[421] | 271 | ; CL |
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[324] | 272 | ;-------------------------------------------------------------------- |
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[421] | 273 | StoreLba48AddressingFromCLandTotalSectorCountFromBXDXAX: |
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| 274 | or cl, FLGL_DPT_LBA_AND_EBIOS_SUPPORTED |
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| 275 | and BYTE [di+DPT.bFlagsLow], ~FLGL_DPT_LBA48 |
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| 276 | or [di+DPT.bFlagsLow], cl |
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[324] | 277 | mov [di+DPT.twLbaSectors], ax |
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| 278 | mov [di+DPT.twLbaSectors+2], dx |
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| 279 | mov [di+DPT.twLbaSectors+4], bx |
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| 280 | ret |
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[421] | 281 | %endif ; MODULE_EBIOS |
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