[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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[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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[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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[473] | 30 | ; DX: Autodetected port (for devices that support autodetection) |
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[3] | 31 | ; ES:SI: Ptr to 512-byte ATA information read from the drive |
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| 32 | ; CS:BP: Ptr to IDEVARS for the controller |
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| 33 | ; DS: RAMVARS segment |
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| 34 | ; ES: BDA Segment |
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| 35 | ; Returns: |
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[558] | 36 | ; DS:DI: Ptr to Disk Parameter Table |
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| 37 | ; CF: Cleared |
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[3] | 38 | ; Corrupts registers: |
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[542] | 39 | ; AX, BX, CX, DX |
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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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[473] | 49 | ; DX: Autodetected port (for devices that support autodetection) |
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[3] | 50 | ; DS:DI: Ptr to Disk Parameter Table |
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| 51 | ; CS:BP: Ptr to IDEVARS for the controller |
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| 52 | ; Returns: |
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[150] | 53 | ; Nothing |
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[3] | 54 | ; Corrupts registers: |
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[150] | 55 | ; AX |
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[3] | 56 | ;-------------------------------------------------------------------- |
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[99] | 57 | .InitializeDPT: |
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[473] | 58 | call CreateDPT_StoreIdevarsOffsetAndBasePortFromCSBPtoDPTinDSDI |
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[150] | 59 | ; Fall to .StoreDriveSelectAndDriveControlByte |
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[3] | 60 | |
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| 61 | ;-------------------------------------------------------------------- |
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[150] | 62 | ; .StoreDriveSelectAndDriveControlByte |
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[3] | 63 | ; Parameters: |
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| 64 | ; BH: Drive Select byte for Drive and Head Register |
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| 65 | ; DS:DI: Ptr to Disk Parameter Table |
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| 66 | ; ES:SI: Ptr to 512-byte ATA information read from the drive |
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| 67 | ; CS:BP: Ptr to IDEVARS for the controller |
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| 68 | ; Returns: |
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[99] | 69 | ; Nothing |
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[3] | 70 | ; Corrupts registers: |
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| 71 | ; AX |
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| 72 | ;-------------------------------------------------------------------- |
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[150] | 73 | .StoreDriveSelectAndDriveControlByte: |
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| 74 | mov al, bh |
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| 75 | and ax, BYTE FLG_DRVNHEAD_DRV ; AL now has Master/Slave bit |
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[411] | 76 | %ifdef MODULE_IRQ |
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[150] | 77 | cmp [cs:bp+IDEVARS.bIRQ], ah ; Interrupts enabled? |
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| 78 | jz SHORT .StoreFlags ; If not, do not set interrupt flag |
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[158] | 79 | or al, FLGL_DPT_ENABLE_IRQ |
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[150] | 80 | .StoreFlags: |
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[411] | 81 | %endif |
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[150] | 82 | mov [di+DPT.wFlags], ax |
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[421] | 83 | ; Fall to .StoreCHSparametersAndAddressingMode |
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[3] | 84 | |
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| 85 | ;-------------------------------------------------------------------- |
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[421] | 86 | ; .StoreCHSparametersAndAddressingMode |
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[3] | 87 | ; Parameters: |
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| 88 | ; DS:DI: Ptr to Disk Parameter Table |
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| 89 | ; ES:SI: Ptr to 512-byte ATA information read from the drive |
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| 90 | ; CS:BP: Ptr to IDEVARS for the controller |
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| 91 | ; Returns: |
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[227] | 92 | ; Nothing |
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[3] | 93 | ; Corrupts registers: |
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[227] | 94 | ; AX, BX, CX, DX |
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[3] | 95 | ;-------------------------------------------------------------------- |
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[421] | 96 | .StoreCHSparametersAndAddressingMode: |
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[542] | 97 | ; Apply any user limited values to ATA ID |
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| 98 | call AtaID_ModifyESSIforUserDefinedLimitsAndReturnTranslateModeInDX |
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[173] | 99 | |
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[422] | 100 | ; Translate P-CHS to L-CHS |
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[549] | 101 | call AtaGeometry_GetLCHStoAXBLBHfromAtaInfoInESSIwithTranslateModeInDX |
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[421] | 102 | mov [di+DPT.wLchsCylinders], ax |
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| 103 | mov [di+DPT.wLchsHeadsAndSectors], bx |
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[542] | 104 | mov al, dl |
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| 105 | eSHL_IM al, TRANSLATEMODE_FIELD_POSITION |
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| 106 | or cl, al |
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[421] | 107 | |
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[542] | 108 | ; Store P-CHS and flags |
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[421] | 109 | call AtaGeometry_GetPCHStoAXBLBHfromAtaInfoInESSI |
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[547] | 110 | dec dl ; Set ZF if TRANSLATEMODE_LARGE, SF if TRANSLATEMODE_NORMAL |
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[567] | 111 | jle SHORT .JumpOverSetBitForAssistedLBA |
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[542] | 112 | |
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[549] | 113 | ; Set LBA bit for Assisted LBA |
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| 114 | or cl, FLGL_DPT_LBA |
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[567] | 115 | .JumpOverSetBitForAssistedLBA: |
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| 116 | jnz SHORT .NothingToChange |
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[549] | 117 | |
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| 118 | ; We cannot have 16 P-Heads heads in Revised ECHS mode (8193 or more cylinders) |
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| 119 | ; but 16 heads are allowed when there are 8192 or less cylinders (ECHS). |
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| 120 | ; Both of these are LARGE modes so do not confuse with NORMAL mode. |
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| 121 | call AtaGeometry_IsDriveSmallEnoughForECHS |
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[568] | 122 | adc bx, -1 ; Adjust 16 P-Heads to 15 if needed |
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[549] | 123 | |
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[542] | 124 | .NothingToChange: |
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| 125 | or [di+DPT.bFlagsLow], cl ; Shift count and addressing mode |
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| 126 | mov [di+DPT.wPchsHeadsAndSectors], bx |
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[550] | 127 | %ifdef MODULE_COMPATIBLE_TABLES OR MODULE_EBIOS |
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[544] | 128 | ; Store P-Cylinders here for Compatible DPTs when FLGL_DPT_LBA is not set |
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| 129 | ; or when drive has over 15,482,880 sectors |
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| 130 | mov [di+DPT.wPchsCylinders], ax |
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[550] | 131 | %endif |
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| 132 | |
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| 133 | %ifdef MODULE_EBIOS |
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[542] | 134 | test cl, FLGL_DPT_LBA |
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| 135 | jz SHORT .NoLbaSoNoEBIOS |
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[533] | 136 | |
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[542] | 137 | ; Store P-Cylinders but only if we have 15,482,880 or less sectors since |
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| 138 | ; we only need P-Cylinders so we can return it from AH=48h |
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| 139 | call AtaGeometry_GetLbaSectorCountToBXDXAXfromAtaInfoInESSI |
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[544] | 140 | sub ax, (MAX_SECTOR_COUNT_TO_RETURN_PCHS+1) & 0FFFFh |
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| 141 | sbb dx, (MAX_SECTOR_COUNT_TO_RETURN_PCHS+1) >> 16 |
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[542] | 142 | sbb bx, BYTE 0 |
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[544] | 143 | jnc SHORT .StoreNumberOfLbaSectors |
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[533] | 144 | |
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[542] | 145 | ; Since we might have altered the default P-CHS parameters to be |
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| 146 | ; presented to the drive (AH=09h), we need to calculate new |
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| 147 | ; P-Cylinders. It could be read from the ATA ID after |
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| 148 | ; COMMAND_INITIALIZE_DEVICE_PARAMETERS but that is too much trouble. |
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| 149 | ; P-Cyls = MIN(16383*16*63, LBA sector count) / (P-Heads * P-Sectors per track) |
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| 150 | call AtaGeometry_GetLbaSectorCountToBXDXAXfromAtaInfoInESSI |
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| 151 | xchg cx, ax ; Sector count to DX:CX |
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| 152 | mov al, [di+DPT.bPchsHeads] |
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| 153 | mul BYTE [di+DPT.bPchsSectorsPerTrack] |
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| 154 | xchg cx, ax |
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| 155 | div cx ; AX = new P-Cylinders |
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[543] | 156 | |
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| 157 | ; We could remove wPchsCylinders from DPT if we calculate it on AH=48h |
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[544] | 158 | ; (and for compatible DPTs) but that would require extra code so we save ROM space instead. |
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[421] | 159 | mov [di+DPT.wPchsCylinders], ax |
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[542] | 160 | |
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[543] | 161 | ; Store CHS sector count as total sector count. We must not use |
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| 162 | ; LBA sector count if it is 15,482,880 or less. |
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[542] | 163 | mul cx |
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| 164 | xor bx, bx |
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[543] | 165 | jmp SHORT .StoreTotalSectorsFromBXDXAX |
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[421] | 166 | |
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[558] | 167 | |
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[421] | 168 | ;-------------------------------------------------------------------- |
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| 169 | ; .StoreNumberOfLbaSectors |
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| 170 | ; Parameters: |
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| 171 | ; DS:DI: Ptr to Disk Parameter Table |
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| 172 | ; ES:SI: Ptr to 512-byte ATA information read from the drive |
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| 173 | ; CS:BP: Ptr to IDEVARS for the controller |
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| 174 | ; Returns: |
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| 175 | ; Nothing |
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| 176 | ; Corrupts registers: |
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| 177 | ; AX, BX, CX, DX |
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| 178 | ;-------------------------------------------------------------------- |
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[542] | 179 | .StoreNumberOfLbaSectors: |
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[421] | 180 | ; Store LBA 28/48 total sector count |
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| 181 | call AtaGeometry_GetLbaSectorCountToBXDXAXfromAtaInfoInESSI |
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[543] | 182 | or [di+DPT.bFlagsLow], cl ; LBA48 flag |
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| 183 | .StoreTotalSectorsFromBXDXAX: |
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[542] | 184 | mov [di+DPT.twLbaSectors], ax |
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| 185 | mov [di+DPT.twLbaSectors+2], dx |
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| 186 | mov [di+DPT.twLbaSectors+4], bx |
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| 187 | .NoLbaSoNoEBIOS: |
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[421] | 188 | %endif ; MODULE_EBIOS |
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[150] | 189 | ; Fall to .StoreDeviceSpecificParameters |
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[3] | 190 | |
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| 191 | ;-------------------------------------------------------------------- |
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[150] | 192 | ; .StoreDeviceSpecificParameters |
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[3] | 193 | ; Parameters: |
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| 194 | ; DS:DI: Ptr to Disk Parameter Table |
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| 195 | ; ES:SI: Ptr to 512-byte ATA information read from the drive |
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[160] | 196 | ; CS:BP: Ptr to IDEVARS for the controller |
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[3] | 197 | ; Returns: |
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[99] | 198 | ; Nothing |
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[3] | 199 | ; Corrupts registers: |
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[150] | 200 | ; AX, BX, CX, DX |
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[3] | 201 | ;-------------------------------------------------------------------- |
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[150] | 202 | .StoreDeviceSpecificParameters: |
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| 203 | call Device_FinalizeDPT |
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[258] | 204 | |
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[262] | 205 | ;---------------------------------------------------------------------- |
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| 206 | ; Update drive counts (hard and floppy) |
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[294] | 207 | ;---------------------------------------------------------------------- |
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[558] | 208 | %ifdef MODULE_SERIAL |
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| 209 | ; Device_FinalizeDPT returns with CF set only when a floppy was found which can't happen without MODULE_SERIAL |
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[258] | 210 | %ifdef MODULE_SERIAL_FLOPPY |
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| 211 | ; |
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| 212 | ; These two instructions serve two purposes: |
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| 213 | ; 1. If the drive is a floppy drive (CF set), then we effectively increment the counter. |
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[294] | 214 | ; 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] | 215 | ; effectively discarded. This is more of a safety check then code that should ever normally be hit (see below). |
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[294] | 216 | ; 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] | 217 | ; this was necessary. Now, this situation shouldn't happen in normal operation, for a couple of reasons: |
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[567] | 218 | ; A. xtidecfg always puts configured serial ports at the end of the IDEVARS list |
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| 219 | ; B. the auto serial code is always executed last |
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| 220 | ; C. the serial server always returns floppy drives last |
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[258] | 221 | ; |
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[605] | 222 | adc BYTE [RAMVARS.xlateVars+XLATEVARS.bFlopCreateCnt], 0 |
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| 223 | jnz SHORT .AllDone |
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[558] | 224 | %else ; ~MODULE_SERIAL_FLOPPY |
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[258] | 225 | ; |
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| 226 | ; Even without floppy support enabled, we shouldn't try to mount a floppy image as a hard disk, which |
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[294] | 227 | ; could lead to unpredictable results since no MBR will be present, etc. The server doesn't know that |
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[258] | 228 | ; floppies are supported, so it is important to still fail here if a floppy is seen during the drive scan. |
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| 229 | ; |
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[605] | 230 | jc SHORT .AllDone |
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[558] | 231 | %endif ; MODULE_SERIAL_FLOPPY |
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| 232 | %endif ; MODULE_SERIAL |
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[258] | 233 | |
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[150] | 234 | inc BYTE [RAMVARS.bDrvCnt] ; Increment drive count to RAMVARS |
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[294] | 235 | |
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[558] | 236 | %ifdef MODULE_SERIAL |
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[294] | 237 | .AllDone: |
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[162] | 238 | clc |
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[558] | 239 | %endif |
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| 240 | |
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[3] | 241 | ret |
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[258] | 242 | |
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[324] | 243 | |
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[422] | 244 | ;-------------------------------------------------------------------- |
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[473] | 245 | ; CreateDPT_StoreIdevarsOffsetAndBasePortFromCSBPtoDPTinDSDI |
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| 246 | ; Parameters: |
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| 247 | ; DX: Autodetected port (for devices that support autodetection) |
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| 248 | ; DS:DI: Ptr to Disk Parameter Table |
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| 249 | ; CS:BP: Ptr to IDEVARS for the controller |
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| 250 | ; Returns: |
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| 251 | ; Nothing |
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| 252 | ; Corrupts registers: |
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| 253 | ; AX |
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| 254 | ;-------------------------------------------------------------------- |
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| 255 | CreateDPT_StoreIdevarsOffsetAndBasePortFromCSBPtoDPTinDSDI: |
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| 256 | mov [di+DPT.bIdevarsOffset], bp ; IDEVARS must start in first 256 bytes of ROM |
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| 257 | mov ax, [cs:bp+IDEVARS.wBasePort] |
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| 258 | mov [di+DPT.wBasePort], ax |
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| 259 | ret |
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