| 1 | ; Project name : XTIDE Universal BIOS
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| 2 | ; Description : Functions for detecting drive for the BIOS.
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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, 2011-2012 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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| 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 | ; Detects all IDE hard disks to be controlled by this BIOS.
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| 25 | ;
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| 26 | ; DetectDrives_FromAllIDEControllers
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| 27 | ; Parameters:
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| 28 | ; DS: RAMVARS segment
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| 29 | ; ES: BDA segment (zero)
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| 30 | ; Returns:
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| 31 | ; Nothing
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| 32 | ; Corrupts registers:
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| 33 | ; All (not segments)
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| 34 | ;--------------------------------------------------------------------
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| 35 | DetectDrives_FromAllIDEControllers:
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| 36 | call RamVars_GetIdeControllerCountToCX
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| 37 | mov bp, ROMVARS.ideVars0 ; CS:BP now points to first IDEVARS
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| 38 |
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| 39 | .DriveDetectLoop: ; Loop through IDEVARS
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| 40 | push cx
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| 41 |
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| 42 | mov cx, g_szDetectMaster
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| 43 | mov bh, MASK_DRVNHEAD_SET ; Select Master drive
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| 44 | call StartDetectionWithDriveSelectByteInBHandStringInCX ; Detect and create DPT + BOOTNFO
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| 45 |
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| 46 | mov cx, g_szDetectSlave
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| 47 | mov bh, MASK_DRVNHEAD_SET | FLG_DRVNHEAD_DRV
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| 48 | call StartDetectionWithDriveSelectByteInBHandStringInCX
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| 49 |
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| 50 | pop cx
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| 51 |
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| 52 | add bp, BYTE IDEVARS_size ; Point to next IDEVARS
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| 53 |
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| 54 | %ifdef MODULE_SERIAL
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| 55 | jcxz .AddHardDisks ; Set to zero on .ideVarsSerialAuto iteration (if any)
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| 56 | %endif
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| 57 |
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| 58 | loop .DriveDetectLoop
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| 59 |
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| 60 | %ifdef MODULE_SERIAL
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| 61 | ;----------------------------------------------------------------------
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| 62 | ;
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| 63 | ; if serial drive detected, do not scan (avoids duplicate drives and isn't needed - we already have a connection)
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| 64 | ;
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| 65 | call FindDPT_ToDSDIforSerialDevice
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| 66 | jnc .AddHardDisks
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| 67 |
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| 68 | mov bp, ROMVARS.ideVarsSerialAuto ; Point to our special IDEVARS structure, just for serial scans
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| 69 |
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| 70 | mov al,[cs:ROMVARS.wFlags] ; Configurator set to always scan?
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| 71 | or al,[es:BDA.bKBFlgs1] ; Or, did the user hold down the ALT key?
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| 72 | and al,8 ; 8 = alt key depressed, same as FLG_ROMVARS_SERIAL_ALWAYSDETECT
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| 73 | jnz .DriveDetectLoop
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| 74 | %endif
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| 75 |
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| 76 | .AddHardDisks:
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| 77 | ;----------------------------------------------------------------------
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| 78 | ;
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| 79 | ; Add in hard disks to BDA, finalize our Count and First variables
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| 80 | ;
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| 81 | ; Note that we perform the add to bHDCount and store bFirstDrv even if the count is zero.
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| 82 | ; This is done because we use the value of .bFirstDrv to know how many drives were in the system
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| 83 | ; at the time of boot, and to return that number on int13h/8h calls. Because the count is zero,
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| 84 | ; FindDPT_ForDriveNumber will not find any drives that are ours.
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| 85 | ;
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| 86 | mov cx, [RAMVARS.wDrvCntAndFlopCnt] ; Our count of hard disks
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| 87 |
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| 88 | mov al, [es:BDA.bHDCount]
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| 89 | add cl, al ; Add our drives to the system count
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| 90 | mov [es:BDA.bHDCount], cl
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| 91 | or al, 80h ; Or in hard disk flag
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| 92 | mov [RAMVARS.bFirstDrv], al ; Store first drive number
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| 93 |
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| 94 | .AddFloppies:
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| 95 | %ifdef MODULE_SERIAL_FLOPPY
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| 96 | ;----------------------------------------------------------------------
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| 97 | ;
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| 98 | ; Add in any emulated serial floppy drives, finalize our packed Count and First variables
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| 99 | ;
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| 100 | dec ch
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| 101 | mov al, ch
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| 102 | js .NoFloppies ; if no drives are present, we store 0ffh
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| 103 |
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| 104 | call FloppyDrive_GetCountFromBIOS_or_BDA
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| 105 |
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| 106 | push ax
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| 107 |
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| 108 | add al, ch ; Add our drives to existing drive count
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| 109 | cmp al, 3 ; For BDA, max out at 4 drives (ours is zero based)
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| 110 | jb .MaxBDAFloppiesExceeded
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| 111 | mov al, 3
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| 112 | .MaxBDAFloppiesExceeded:
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| 113 | eROR_IM al, 2 ; move to bits 6-7
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| 114 | inc ax ; low order bit, indicating floppy drive exists
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| 115 |
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| 116 | mov ah, [es:BDA.wEquipment] ; Load Equipment WORD low byte
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| 117 | and ah, 03eh ; Mask off drive number and drives present bit
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| 118 | or al, ah ; Or in new values
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| 119 | mov [es:BDA.wEquipment], al ; and store
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| 120 |
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| 121 | mov al, 1eh ; BDA pointer to Floppy DPT
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| 122 | mov si, AH8h_FloppyDPT
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| 123 | call Interrupts_InstallHandlerToVectorInALFromCSSI
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| 124 |
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| 125 | pop ax
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| 126 |
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| 127 | shr ch, 1 ; number of drives, 1 or 2 only, to CF flag (clear=1, set=2)
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| 128 | rcl al, 1 ; starting drive number in upper 7 bits, number of drives in low bit
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| 129 | .NoFloppies:
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| 130 | mov [RAMVARS.xlateVars+XLATEVARS.bFlopCntAndFirst], al
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| 131 | %endif
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| 132 |
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| 133 | ret
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| 134 |
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| 135 | %ifndef CHECK_FOR_UNUSED_ENTRYPOINTS
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| 136 | %if FLG_ROMVARS_SERIAL_SCANDETECT != 8
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| 137 | %error "DetectDrives is currently coded to assume that FLG_ROMVARS_SERIAL_SCANDETECT is the same bit as the ALT key code in the BDA. Changes in the code will be needed if these values are no longer the same."
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| 138 | %endif
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| 139 | %endif
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| 140 |
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| 141 |
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| 142 | ;--------------------------------------------------------------------
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| 143 | ; StartDetectionWithDriveSelectByteInBHandStringInCX
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| 144 | ; Parameters:
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| 145 | ; BH: Drive Select byte for Drive and Head Register
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| 146 | ; CX: Offset to "Master" or "Slave" string
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| 147 | ; CS:BP: Ptr to IDEVARS for the drive
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| 148 | ; DS: RAMVARS segment
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| 149 | ; ES: Zero (BDA segment)
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| 150 | ; Returns:
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| 151 | ; None
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| 152 | ; Corrupts registers:
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| 153 | ; AX, BX, CX, DX, SI, DI
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| 154 | ;--------------------------------------------------------------------
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| 155 | StartDetectionWithDriveSelectByteInBHandStringInCX:
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| 156 | call DetectPrint_StartDetectWithMasterOrSlaveStringInCXandIdeVarsInCSBP
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| 157 | ; Fall to .ReadAtaInfoFromHardDisk
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| 158 |
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| 159 | ;--------------------------------------------------------------------
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| 160 | ; .ReadAtaInfoFromHardDisk
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| 161 | ; Parameters:
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| 162 | ; BH: Drive Select byte for Drive and Head Register
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| 163 | ; CS:BP: Ptr to IDEVARS for the drive
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| 164 | ; DS: RAMVARS segment
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| 165 | ; ES: Zero (BDA segment)
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| 166 | ; Returns:
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| 167 | ; CF: Cleared if ATA-information read successfully
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| 168 | ; Set if any error
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| 169 | ; Corrupts registers:
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| 170 | ; AX, BL, CX, DX, SI, DI
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| 171 | ;--------------------------------------------------------------------
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| 172 | .ReadAtaInfoFromHardDisk:
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| 173 | mov si, BOOTVARS.rgbAtaInfo ; ES:SI now points to ATA info location
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| 174 | push es
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| 175 | push si
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| 176 | push bx
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| 177 | call Device_IdentifyToBufferInESSIwithDriveSelectByteInBH
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| 178 | pop bx
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| 179 | pop si
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| 180 | pop es
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| 181 | jnc SHORT CreateBiosTablesForHardDisk
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| 182 | ; Fall to .ReadAtapiInfoFromDrive
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| 183 |
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| 184 | .ReadAtapiInfoFromDrive: ; Not yet implemented
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| 185 | ;call ReadAtapiInfoFromDrive ; Assume CD-ROM
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| 186 | ;jnc SHORT _CreateBiosTablesForCDROM
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| 187 |
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| 188 | ;jmp short DetectDrives_DriveNotFound
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| 189 | ;;; fall-through instead of previous jmp instruction
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| 190 | ;--------------------------------------------------------------------
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| 191 | ; DetectDrives_DriveNotFound
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| 192 | ; Parameters:
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| 193 | ; Nothing
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| 194 | ; Returns:
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| 195 | ; CF: Set (from BootMenuPrint_NullTerminatedStringFromCSSIandSetCF)
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| 196 | ; Corrupts registers:
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| 197 | ; AX, SI
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| 198 | ;--------------------------------------------------------------------
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| 199 | DetectDrives_DriveNotFound:
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| 200 | mov si, g_szNotFound
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| 201 | jmp BootMenuPrint_NullTerminatedStringFromCSSIandSetCF
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| 202 |
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| 203 |
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| 204 | ;--------------------------------------------------------------------
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| 205 | ; CreateBiosTablesForHardDisk
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| 206 | ; Parameters:
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| 207 | ; BH: Drive Select byte for Drive and Head Register
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| 208 | ; CS:BP: Ptr to IDEVARS for the drive
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| 209 | ; ES:SI Ptr to ATA information for the drive
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| 210 | ; DS: RAMVARS segment
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| 211 | ; ES: BDA/Bootnfo segment
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| 212 | ; Returns:
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| 213 | ; Nothing
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| 214 | ; Corrupts registers:
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| 215 | ; AX, BX, CX, DX, SI, DI
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| 216 | ;--------------------------------------------------------------------
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| 217 | CreateBiosTablesForHardDisk:
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| 218 | call CreateDPT_FromAtaInformation
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| 219 | jc SHORT DetectDrives_DriveNotFound
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| 220 | call BootMenuInfo_CreateForHardDisk
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| 221 | jmp short DetectPrint_DriveNameFromBootnfoInESBX
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