| 1 | ; Project name : XTIDE Universal BIOS
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| 2 | ; Description : Functions for creating Disk Parameter Table.
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| 3 |
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| 4 | ;
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| 5 | ; XTIDE Universal BIOS and Associated Tools
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| 6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 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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| 12 | ;
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| 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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| 16 | ; GNU General Public License for more details.
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| 17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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| 18 | ;
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| 19 |
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| 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 | ; DX: Autodetected port (for devices that support autodetection)
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| 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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| 36 | ; DS:DI: Ptr to Disk Parameter Table (if successful)
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| 37 | ; CF: Cleared if DPT created successfully
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| 38 | ; Set if any error
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| 39 | ; Corrupts registers:
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| 40 | ; AX, BX, CX, DX
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| 41 | ;--------------------------------------------------------------------
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| 42 | CreateDPT_FromAtaInformation:
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| 43 | call FindDPT_ForNewDriveToDSDI
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| 44 | ; Fall to .InitializeDPT
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| 45 |
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| 46 | ;--------------------------------------------------------------------
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| 47 | ; .InitializeDPT
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| 48 | ; Parameters:
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| 49 | ; BH: Drive Select byte for Drive and Head Register
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| 50 | ; DX: Autodetected port (for devices that support autodetection)
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| 51 | ; DS:DI: Ptr to Disk Parameter Table
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| 52 | ; CS:BP: Ptr to IDEVARS for the controller
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| 53 | ; Returns:
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| 54 | ; Nothing
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| 55 | ; Corrupts registers:
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| 56 | ; AX
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| 57 | ;--------------------------------------------------------------------
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| 58 | .InitializeDPT:
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| 59 | call CreateDPT_StoreIdevarsOffsetAndBasePortFromCSBPtoDPTinDSDI
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| 60 | ; Fall to .StoreDriveSelectAndDriveControlByte
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| 61 |
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| 62 | ;--------------------------------------------------------------------
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| 63 | ; .StoreDriveSelectAndDriveControlByte
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| 64 | ; Parameters:
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| 65 | ; BH: Drive Select byte for Drive and Head Register
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| 66 | ; DS:DI: Ptr to Disk Parameter Table
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| 67 | ; ES:SI: Ptr to 512-byte ATA information read from the drive
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| 68 | ; CS:BP: Ptr to IDEVARS for the controller
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| 69 | ; Returns:
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| 70 | ; Nothing
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| 71 | ; Corrupts registers:
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| 72 | ; AX
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| 73 | ;--------------------------------------------------------------------
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| 74 | .StoreDriveSelectAndDriveControlByte:
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| 75 | mov al, bh
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| 76 | and ax, BYTE FLG_DRVNHEAD_DRV ; AL now has Master/Slave bit
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| 77 | %ifdef MODULE_IRQ
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| 78 | cmp [cs:bp+IDEVARS.bIRQ], ah ; Interrupts enabled?
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| 79 | jz SHORT .StoreFlags ; If not, do not set interrupt flag
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| 80 | or al, FLGL_DPT_ENABLE_IRQ
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| 81 | .StoreFlags:
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| 82 | %endif
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| 83 | mov [di+DPT.wFlags], ax
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| 84 | ; Fall to .StoreCHSparametersAndAddressingMode
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| 85 |
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| 86 | ;--------------------------------------------------------------------
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| 87 | ; .StoreCHSparametersAndAddressingMode
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| 88 | ; Parameters:
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| 89 | ; DS:DI: Ptr to Disk Parameter Table
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| 90 | ; ES:SI: Ptr to 512-byte ATA information read from the drive
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| 91 | ; CS:BP: Ptr to IDEVARS for the controller
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| 92 | ; Returns:
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| 93 | ; Nothing
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| 94 | ; Corrupts registers:
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| 95 | ; AX, BX, CX, DX
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| 96 | ;--------------------------------------------------------------------
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| 97 | .StoreCHSparametersAndAddressingMode:
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| 98 | ; Apply any user limited values to ATA ID
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| 99 | call AtaID_ModifyESSIforUserDefinedLimitsAndReturnTranslateModeInDX
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| 100 |
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| 101 | ; Translate P-CHS to L-CHS
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| 102 | call AtaGeometry_GetLCHStoAXBLBHfromAtaInfoInESSIwithTranslateModeInDX
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| 103 | mov [di+DPT.wLchsCylinders], ax
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| 104 | mov [di+DPT.wLchsHeadsAndSectors], bx
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| 105 | mov al, dl
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| 106 | eSHL_IM al, TRANSLATEMODE_FIELD_POSITION
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| 107 | or cl, al
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| 108 |
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| 109 | ; Store P-CHS and flags
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| 110 | call AtaGeometry_GetPCHStoAXBLBHfromAtaInfoInESSI
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| 111 | dec dl ; Set ZF if TRANSLATEMODE_LARGE, SF if TRANSLATEMODE_NORMAL
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| 112 | js SHORT .NothingToChange
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| 113 | jz SHORT .LimitHeadsForLargeAddressingMode
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| 114 |
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| 115 | ; Set LBA bit for Assisted LBA
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| 116 | or cl, FLGL_DPT_LBA
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| 117 | jmp SHORT .NothingToChange
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| 118 |
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| 119 | .LimitHeadsForLargeAddressingMode:
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| 120 | ; We cannot have 16 P-Heads heads in Revised ECHS mode (8193 or more cylinders)
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| 121 | ; but 16 heads are allowed when there are 8192 or less cylinders (ECHS).
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| 122 | ; Both of these are LARGE modes so do not confuse with NORMAL mode.
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| 123 | call AtaGeometry_IsDriveSmallEnoughForECHS
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| 124 | jc SHORT .NothingToChange
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| 125 | dec bx ; Adjust 16 P-Heads to 15
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| 126 |
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| 127 | .NothingToChange:
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| 128 | or [di+DPT.bFlagsLow], cl ; Shift count and addressing mode
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| 129 | mov [di+DPT.wPchsHeadsAndSectors], bx
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| 130 | %ifdef MODULE_COMPATIBLE_TABLES OR MODULE_EBIOS
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| 131 | ; Store P-Cylinders here for Compatible DPTs when FLGL_DPT_LBA is not set
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| 132 | ; or when drive has over 15,482,880 sectors
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| 133 | mov [di+DPT.wPchsCylinders], ax
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| 134 | %endif
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| 135 |
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| 136 | %ifdef MODULE_EBIOS
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| 137 | test cl, FLGL_DPT_LBA
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| 138 | jz SHORT .NoLbaSoNoEBIOS
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| 139 |
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| 140 | ; Store P-Cylinders but only if we have 15,482,880 or less sectors since
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| 141 | ; we only need P-Cylinders so we can return it from AH=48h
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| 142 | call AtaGeometry_GetLbaSectorCountToBXDXAXfromAtaInfoInESSI
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| 143 | sub ax, (MAX_SECTOR_COUNT_TO_RETURN_PCHS+1) & 0FFFFh
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| 144 | sbb dx, (MAX_SECTOR_COUNT_TO_RETURN_PCHS+1) >> 16
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| 145 | sbb bx, BYTE 0
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| 146 | jnc SHORT .StoreNumberOfLbaSectors
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| 147 |
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| 148 | ; Since we might have altered the default P-CHS parameters to be
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| 149 | ; presented to the drive (AH=09h), we need to calculate new
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| 150 | ; P-Cylinders. It could be read from the ATA ID after
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| 151 | ; COMMAND_INITIALIZE_DEVICE_PARAMETERS but that is too much trouble.
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| 152 | ; P-Cyls = MIN(16383*16*63, LBA sector count) / (P-Heads * P-Sectors per track)
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| 153 | call AtaGeometry_GetLbaSectorCountToBXDXAXfromAtaInfoInESSI
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| 154 | xchg cx, ax ; Sector count to DX:CX
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| 155 | mov al, [di+DPT.bPchsHeads]
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| 156 | mul BYTE [di+DPT.bPchsSectorsPerTrack]
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| 157 | xchg cx, ax
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| 158 | div cx ; AX = new P-Cylinders
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| 159 |
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| 160 | ; We could remove wPchsCylinders from DPT if we calculate it on AH=48h
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| 161 | ; (and for compatible DPTs) but that would require extra code so we save ROM space instead.
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| 162 | mov [di+DPT.wPchsCylinders], ax
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| 163 |
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| 164 | ; Store CHS sector count as total sector count. We must not use
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| 165 | ; LBA sector count if it is 15,482,880 or less.
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| 166 | mul cx
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| 167 | xor bx, bx
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| 168 | jmp SHORT .StoreTotalSectorsFromBXDXAX
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| 169 | ; Fall to .StoreNumberOfLbaSectors
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| 170 |
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| 171 | ;--------------------------------------------------------------------
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| 172 | ; .StoreNumberOfLbaSectors
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| 173 | ; Parameters:
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| 174 | ; DS:DI: Ptr to Disk Parameter Table
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| 175 | ; ES:SI: Ptr to 512-byte ATA information read from the drive
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| 176 | ; CS:BP: Ptr to IDEVARS for the controller
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| 177 | ; Returns:
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| 178 | ; Nothing
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| 179 | ; Corrupts registers:
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| 180 | ; AX, BX, CX, DX
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| 181 | ;--------------------------------------------------------------------
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| 182 | .StoreNumberOfLbaSectors:
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| 183 | ; Store LBA 28/48 total sector count
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| 184 | call AtaGeometry_GetLbaSectorCountToBXDXAXfromAtaInfoInESSI
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| 185 | or [di+DPT.bFlagsLow], cl ; LBA48 flag
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| 186 | .StoreTotalSectorsFromBXDXAX:
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| 187 | mov [di+DPT.twLbaSectors], ax
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| 188 | mov [di+DPT.twLbaSectors+2], dx
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| 189 | mov [di+DPT.twLbaSectors+4], bx
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| 190 | .NoLbaSoNoEBIOS:
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| 191 | %endif ; MODULE_EBIOS
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| 192 | ; Fall to .StoreDeviceSpecificParameters
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| 193 |
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| 194 | ;--------------------------------------------------------------------
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| 195 | ; .StoreDeviceSpecificParameters
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| 196 | ; Parameters:
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| 197 | ; DS:DI: Ptr to Disk Parameter Table
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| 198 | ; ES:SI: Ptr to 512-byte ATA information read from the drive
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| 199 | ; CS:BP: Ptr to IDEVARS for the controller
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| 200 | ; Returns:
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| 201 | ; Nothing
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| 202 | ; Corrupts registers:
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| 203 | ; AX, BX, CX, DX
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| 204 | ;--------------------------------------------------------------------
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| 205 | .StoreDeviceSpecificParameters:
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| 206 | call Device_FinalizeDPT
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| 207 |
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| 208 | ;----------------------------------------------------------------------
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| 209 | ; Update drive counts (hard and floppy)
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| 210 | ;----------------------------------------------------------------------
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| 211 |
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| 212 | %ifdef MODULE_SERIAL_FLOPPY
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| 213 | ;
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| 214 | ; These two instructions serve two purposes:
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| 215 | ; 1. If the drive is a floppy drive (CF set), then we effectively increment the counter.
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| 216 | ; 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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| 217 | ; effectively discarded. This is more of a safety check then code that should ever normally be hit (see below).
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| 218 | ; 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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| 219 | ; this was necessary. Now, this situation shouldn't happen in normal operation, for a couple of reasons:
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| 220 | ; A. xtidecfg always puts configured serial ports at the end of the IDEVARS list
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| 221 | ; B. the auto serial code is always executed last
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| 222 | ; C. the serial server always returns floppy drives last
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| 223 | ;
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| 224 | adc byte [RAMVARS.xlateVars+XLATEVARS.bFlopCreateCnt], 0
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| 225 | jnz .AllDone
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| 226 | %else
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| 227 | ;
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| 228 | ; Even without floppy support enabled, we shouldn't try to mount a floppy image as a hard disk, which
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| 229 | ; could lead to unpredictable results since no MBR will be present, etc. The server doesn't know that
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| 230 | ; floppies are supported, so it is important to still fail here if a floppy is seen during the drive scan.
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| 231 | ;
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| 232 | jc .AllDone
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| 233 | %endif
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| 234 |
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| 235 | inc BYTE [RAMVARS.bDrvCnt] ; Increment drive count to RAMVARS
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| 236 |
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| 237 | .AllDone:
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| 238 | clc
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| 239 | ret
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| 240 |
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| 241 |
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| 242 | ;--------------------------------------------------------------------
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| 243 | ; CreateDPT_StoreIdevarsOffsetAndBasePortFromCSBPtoDPTinDSDI
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| 244 | ; Parameters:
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| 245 | ; DX: Autodetected port (for devices that support autodetection)
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| 246 | ; DS:DI: Ptr to Disk Parameter Table
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| 247 | ; CS:BP: Ptr to IDEVARS for the controller
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| 248 | ; Returns:
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| 249 | ; Nothing
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| 250 | ; Corrupts registers:
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| 251 | ; AX
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| 252 | ;--------------------------------------------------------------------
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| 253 | CreateDPT_StoreIdevarsOffsetAndBasePortFromCSBPtoDPTinDSDI:
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| 254 | mov [di+DPT.bIdevarsOffset], bp ; IDEVARS must start in first 256 bytes of ROM
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| 255 | mov ax, [cs:bp+IDEVARS.wBasePort]
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| 256 | mov [di+DPT.wBasePort], ax
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| 257 | ret
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