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469 lines
16 KiB
Z80 Assembly
469 lines
16 KiB
Z80 Assembly
;::::::::::::::::::::::::::::::::::::::::::::::::**************************
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; Hard disk routines as implemented for ** Hardware Dependent **
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; Tilmann Reh's GIDE board adapted to the ** for exact interface **
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; D-X Designs Pty Ltd P112. **************************
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; Portions derived from GIDE.Z80 with tips from GIDETEST.PAS by Tilmann Reh.
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;--------------------------------------------------------------------------
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; This file uses modifications of the definitions in ICFG-xx to reflect
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; Physical and/or logical definitions for IDE drives. A controller type of
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; 8xH signifies IDE/ATA drives, in which case the Drive byte at HDRVx is:
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; 7 6 5 4 3 2 1 0
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; | | | | | | | +- Unit Number (0 = Master, 1 = Slave)
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; | | | | +-+-+--- (reserved)
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; | | | +--------- 1 = Active, 0 = Inactive
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; +-+-+----------- (reserved)
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; Additionally, the first byte of the Reduced Write Cylinder word is re-
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; defined to be the number of physical/logical Sectors-Per-Track.
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; These parameters are used to convert the Track & 16 Sector/Track format
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; assumed in the B/P Bios definitions for Hard Drives into Track/Sector/Head
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; Sector Number needed for IDE/ATA Data accesses. Direct driver IO routines
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; to Select (SELHD), Read (HDREAD) and Write (HDWRIT) are all included here.
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;--------------------------------------------------------------------------
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; 1.0 - 26 Aug 01 - Cleaned up source and included fixes from SCSI. HFB
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; 0.2 - 28 Jun 97 - Added Home Drive, Retry Disable bit handling. HFB
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; 0.1 - 25 Apr 97 - Initial Test Release HFB
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;***************************************************************************
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IF BANKED
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COMMON /BANK2/
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ELSE
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CSEG
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ENDIF
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;:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
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; Function 0 - Set User Data Area Adress for Direct Disk IO, Return
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; Number of Bytes in the driver Command Block (SCSI-"like")
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; For IDE, a minimum of 6 Bytes is needed (Comnd,Trk(2),Sctr,Head,Drive)
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; Enter: DE = Address of User Data Area
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; Exit : A = Number of bytes available in the Command Block
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; Uses : A,HL
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;:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
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HDVALS: LD (DATADR),DE ; Save the Users Data Area
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LD A,CMDSIZ
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RET
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;:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
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; Function 1 - Set Drive bit Command Block from A
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; Enter: A = Drive Byte
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; Exit : A = Drive Bit in LSB (00/01H, for Master/Slave)
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; Uses : AF
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;:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
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HDSLCT: AND 01H ; Strip any garbage
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LD (hdUnit),A ; save in Command Block
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RET
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;========================================================================
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; Select Hard Disk (Unit 0/1, Master/Slave) < Internal Bios routine >
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SELHD: LD A,(SEKPDN) ; Load Device and Unit # to select
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SELHDA: LD C,A ; position for calculations
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LD B,HDRV1-HDRV0 ; with size
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MLT BC ; Calculate offset into table
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LD HL,HDRV0 ; from first Physical drive
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ADD HL,BC
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LD A,(CNTRLR) ; Set Controller type
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BIT 7,A ; Is it IDE/ATA?
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JP Z,SELERR ; ..jump if Not to return Error
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LD A,(HL) ; Fetch Device/LUN byte
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CALL HDSLCT ; setting variables for Device and LUN
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; Wait until Drive is ready or 10 Seconds
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LD A,100 ; 100-100mS ticks
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SelWt: CALL BsyWt ; Wait this long for Drive to come Ready
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JP C,SELERR ; ..Error if Timeout
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; Else gather drive geometry specified in ICFG-xx
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INC HL ; Advance to Number of Tracks Word
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LD BC,4 ; Move Number of Tracks (Word)
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LD DE,hdTrks ; Number of Heads (Byte)
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LDIR ; and Sctrs/Trk to local storage
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SetPmV: JP SETPARMS ; then set parameters for DPH/DPB
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;::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
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; Write to Hard Disk Drive < Internal BIOS Routine >
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; Writes from HSTBUF using HSTTRK and HSTSEC to build Block Number.
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; NOTE: This routine uses physical drive characteristics from ICFG-xx.
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HDWRIT: XOR A
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LD (HSTACT),A ; Show no active writes pending
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LD HL,7CH*256+CMDWR ; Set the IDE Write Command
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JR HDRW ; ..continue
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;::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
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; Read from Hard Disk Drive < Internal BIOS Routine >
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; Reads to HSTBUF using HSTTRK and HSTSEC to build Block Number.
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; NOTE: This routine uses physical drive characteristics from ICFG-xx.
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; The routine computes a sequential block number (as with SCSI) with
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; the algorithm; Trk * 16 + Sector, then computes Head, Sector and Track
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; using Physical characteristics (hdHds = Number_of_Heads,
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; hdSPT = Sectors_per_Track) according to the algorithm:
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;
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; Sector := (Block# MOD hdSPT)+1 (* Quotient1 := Block# DIV hdSPT *)
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; Head := Quotient1 MOD hdHds (* Quotient2 := Quotient1 DIV hdHds *)
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; Track := Quotient2
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HDREAD: LD HL,7EH*256+CMDRD ; Set the IDE Read Command
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HDRW: LD (hdComd),HL ; save
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; Prepare for Disk Read/Write by Preloading all Registers
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LD HL,(HSTDPH) ; Get pointer to desired DPH
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DEC HL ; back up to Device #
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LD A,(HL) ; and fetch
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CALL SELHDA ; Select this device from A-Reg
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LD BC,4*256+0 ; Count = 4, MSB of Block # = 0
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LD HL,(HSTTRK) ; Get requested track
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MUL16: ADD HL,HL ; Multiply C,H,L by 16 for 21-bit block #
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RL C ; shifting overflow bit to C
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DJNZ MUL16 ; ..and looping til * 16
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LD A,(HSTSEC) ; Get Logical Host Sector # (4-bits)
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ADD A,L ; add in Hi 4-bits of low Block #
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LD L,A ; save back
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LD A,(hdSPT) ; Get Sctrs-Per-Trk
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LD E,A
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CALL Divide ; Divide CHL by E
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INC A ; Make Sctr # Base at 1
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LD (hdSec),A ; (save)
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LD A,(hdHds) ; Get Number of Heads
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LD E,A
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CALL Divide ; Divide CHL (Quotient from above) by E
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LD (hdHead),A ; (save)
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LD A,H ; Swap
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LD H,L ; Bytes
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LD L,A ; in Track Word
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LD (hdTrkH),HL ; save Quotient (Track, Hi & Lo)
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LD A,0AAH
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LD (hdErr),A ; Activate Retries in case Reading
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LD A,1
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LD (hdSCnt),A ; Do only One Sector
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LD A,5 ; Give it a few tries
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HDOps0: LD (HRTrys),A ; Save Count
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CALL GoGIDE ; Try Read/Write Operation
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RET Z ; ..quit if Ok
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LD A,(HRTrys) ; Else
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DEC A ; Any tries remaining?
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JR NZ,HDOps0 ; ..loop if So
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DEC A ; Else Return 0FFH
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RET
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;:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
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; Function 2 - Direct IDE/ATA driver. This routine performs the function
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; described by the command in the HD Command Block with Data area
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; addressed by DE. At the end of the function, 512 bytes of data are
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; transferred from the Bios IO Buffer to the Users Space set by Fcn 0.
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; The IDE/ATA Command Block layout is:
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;
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; Byte Format R/W/V Init RdID Power Diag PwrSet Home
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; 0 [Command ] 50 20/30/40 91 EC E0/E1/E5 90 E2/E3 10
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; 1 [BitMap ] 70 7C/(7E) 74 40 00 00 04 40
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; 2 [Drv/Hd ] 0AnH 0AnH 0AnH-1 0AnH - - - 0An0
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; 3 [Cyl#(Hi)] CylHi CylHi CylHi - - - - -
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; 4 [Cyl#(Lo)] CylLo CylLo CylLo - - - - -
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; 5 [Sector# ] - Sctr - - - - - -
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; 6 [Sctr Cnt] - SCnt NSecs - - - n*5Secs -
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; 7 [Err Reg ] - (0AA) - - - - - -
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; 8 [Dgtl Out] - - - - - - - -
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; Rslts/Stat: Stat Stat Stat Stat SCnt Err - Stat
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; Reg Reg Reg Reg Reg Reg Reg
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;
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; Enter: DE = Pointer to User IDE/ATA Command Block
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; "hdComd" contains pre-filled Command Block
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; A = 0 if No Data to be Written, FF if User-supplied data to write
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; Exit : H = Error Byte value (If any)
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; L = Status Byte value (If any)
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; A = Status byte, Flags set accordingly.
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; Uses : AF,BC,DE,HL
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; NOTE : Routine assumes the Command Block is properly configured for the
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; desired function and device. Timeout returns 0FFH, Unsupported
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; command returns 7FH.
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; For external access, It assumes the user has used Functions 0 and 1 to
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; set the data transfer source/dest address drive number.
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;::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
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HD_RW: PUSH AF ; Save User Data Flag
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PUSH DE ; and ptr to User's CDB
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CALL FLUSH ; Insure Host Buffer is Free
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POP HL ; restore User CDB ptr to HL for move
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IF BANKED
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CALL SHDBNK ; Load Banks for transfer to System fm User
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CALL XMOVE ; and Set
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ENDIF ;Banked
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LD DE,hdComd
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LD BC,10 ; Move a 10-byte block
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CALL MOVE ; into the Command area
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POP AF ; Restore Flag
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OR A ; Any User data to write?
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JR Z,HD_RW0 ; ..bypass move if not
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IF BANKED
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CALL SHDBNK ; Load for move from User's to System Banks
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CALL XMOVE ; and Set
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ENDIF ;Banked
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CALL HDDMOV ; Set to move 512 bytes from User to Hstbuf
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CALL MOVE ; Do It!
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HD_RW0: CALL GoGIDE ; Set Data Addr and do the operation
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PUSH HL ; save Status/Err
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IF BANKED
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CALL SHDBNK ; Load Bank Numbers
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LD A,B ; Swap
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LD B,C ; Source
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LD C,A ; and Destination Banks
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CALL XMOVE ; Set Source/Dest
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ENDIF ;Banked
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CALL HDDMOV ; set Addresses and Length
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EX DE,HL ; write back to User's area
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CALL MOVE ; move without affecting status in A
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POP HL ; Restore Status/Err bytes for checks
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LD A,L ; Get Status
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OR A ; set flags
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RET ; ..and quit
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;++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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; Raw GIDE Driver. Assumes Command in hdComd and Parms in Comnd Data Block
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GoGIDE:
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IF NOWAIT ; If Wait States not desired..
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IN0 A,(DCNTL) ; Get current settings
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LD (WTSAVE),A ; save for exit
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AND 11001111B ; Keep everything but IO Waits
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OUT0 (DCNTL),A ; and set to No IO Wait States
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ENDIF ;nowait
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; Wait approximately 5 Seconds for Target to become Busy.
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LD L,0FFH ; Preset Timeout Error Status
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LD A,50 ; 50-100mS ticks
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CALL BsyWt ; Monitor Timeout while checking Busy Bit
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JR C,TIMOUT ; ..Reporting Error if Timed Out
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;..else fall thru..
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LD HL,hdHead
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LD A,(hdUnit) ; Get Drive #
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ADD A,A ; Shift
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ADD A,A ; Drive Bit
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ADD A,A ; into
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ADD A,A ; position
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OR (HL) ; Add Head # bits
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OR 0A0H ; and Fixed Bits
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LD (HL),A
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LD BC,IDESDH ; Set Port Address (GIDE+0EH)
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DEC HL ; back ptr up to hdBMap byte
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LD E,(HL) ; fetch
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LD D,7 ; and set number of bytes
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RL E ; Shift B7 out
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GoGID0: RL E ; Test bit to Carry
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INC HL ; bump Byte ptr
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JR NC,GoGID1 ; ..jump if No byte to write
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LD A,(HL) ; Else get byte
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OUT (C),A ; set IDE Register
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GoGID1: DEC BC ; Down to next Register address
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DEC D ; Finished?
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JR NZ,GoGID0 ; ..loop if Not
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LD HL,HSTBUF ; Always IO to/from Host Buffer
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LD BC,IDEDat ; Pre-load Data Reg Adr in C, 0 in B
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LD A,(hdComd) ; Get Command Byte
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CP CMDVER+2 ; Is it in the range w/retry bit?
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JR NC,GoGID2 ; ..jump if Not
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AND 0FEH ; Else Ignore Retry disable bit (B0)
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CP CMDRD ; Read Sector?
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JR Z,HRead
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CP CMDWR ; Write Sector?
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JR Z,HWrite
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CP CMDVER ; Verify Sector(s)?
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JR Z,HMisc
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BIT 4,A ; Is it Home Comnd?
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JR Z,HMisc
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;..else fall thru to error exit..
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GoGID2: CP CMDID ; Read ID Information?
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JR Z,HRead
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CP CMDDIAG ; Perform Diagnostics?
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JR Z,HDiag
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CP CMDINIT ; Initialize Drive Parameters?
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JR Z,HInit
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CP CMDPWQ ; Query Power Status?
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JR Z,HPwrQ
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CP CMDFMT ; Format Track?
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JR Z,HWrite
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CP CMDPW0 ; Low range of Power Set Commands?
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JR C,GoGIDX ; ..jump if < 0E0H
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CP CMDPW3+1 ; High Range of Power Set Commands?
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JR C,HMisc ; ..jump if in [E0..E3]
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GoGIDX: RES 7,L ; If Not legal Command, Return Error 7FH
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POP AF ; (clear command from stack)
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TIMOUT:
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IF NOWAIT
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LD A,(WTSAVE) ; Get entry Wait state settings
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OUT0 (DCNTL),A ; and restore
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ENDIF
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LD A,L ; get Status Byte
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LD (ERFLAG),A ; (store)
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OR A ; set flags
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RET ; and return
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;.....
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; Read a Sector from the Disk, or Disk Parameters to the Buffer
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HRead: CALL Cmd_Wt ; Send Command in A, Return when Ready
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HRead0: IN A,(IDECmd) ; Get Status
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BIT 3,A ; Ready?
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JR Z,HRead0 ; ..loop if Not
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INIR ; Read 512 bytes
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INIR ; in two-256 byte sequences
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HdFini: CALL Wt_Rdy ; Wait for drive to become Ready
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;; -- May need this with some Older Drives that send ECC bytes with no warning!
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;; BIT 4,A ; DRQ Shifted?
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;; JR Z,HdFnQ ; ..jump if Not
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;; IN A,(IDEDat) ; Else Read data reg (ECC Bytes?
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;; JR HdFini ; ..loop til no more data
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HdFnQ: IN A,(IDECmd) ; Restore byte
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AND 10001001B ; Busy, DRQ, or Error?
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JR Z,HdFnOk ; ..exit if Ok
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LD A,02H ; Else Set Error status = 2
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HdFnOk: LD L,A ; store
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IN A,(IDEErr) ; Get Any Error Status
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LD H,A ; save
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JR TIMOUT ; ..and exit thru common location
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;.....
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; Write a 512-byte Sector to the Disk
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HWrite: CALL Cmd_Wt ; Send Command in A, Return when Ready
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HWrit2: IN A,(IDECmd)
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BIT 3,A ; Data Request?
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JR Z,HWrit2 ; ..loop if Not
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OTIR ; Else Write 512 bytes
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OTIR ; in two-256 byte operations
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HInit: CALL Wt_Rdy
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JR HdFnQ ; ..and finish off above
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;.....
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; Execute Drive Diagnostics
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HDiag: CALL Cmd_Wt ; Send Command in A, Return when Ready
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IN A,(IDEErr) ; Read Status of Tests
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JR HdFnOk ; ..exit with Status
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;.....
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; Query Power Save Status
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HPwrQ: CALL Cmd_Wt ; Send Command in A, Return when Ready
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IN A,(IDESCnt) ; Get Status (00=Running, FF=Stopped)
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JR HdFnOk ; ..exit with Status
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;.....
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; Miscellaneous Commands such as Set Various Power Control Features
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HMisc: CALL Cmd_Wt ; Send Command in A, Return When Ready
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JR HdFnQ ; ..exit checking Status
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;================== SUPPORT ROUTINES ==================
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; Divide 24-bit Number by 8-bit Number returning Quotient and Remainder
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; Enter: CHL = 24-bit Unsigned Dividend
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; E = 8-bit Unsigned Divisor
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; Exit : CHL = 24-bit Quotient
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; A = 8-bit Remainder
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; Uses : AF,BC,HL
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Divide: LD B,24+1 ; 25 times thru Loop
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XOR A ; Clear Remainder and Carry
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Div: ADC A,A ; Shift Accum Left + Carry
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SBC A,E ; Subtract Divisor
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JR NC,Div0 ; ..jump if it Worked
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ADD A,E ; Else restore Accum & Carry
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Div0: CCF ; Flip Carry Bit
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ADC HL,HL ; Shift any Carry into
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RL C ; Dividend/Quotient
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DJNZ Div ; ..loop til Done
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RET
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;.....
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; Wait for Drive to become Ready (With Timeout)
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; Enter: A = Number of 100 mS increments to wait before timeout
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; Exit : Carry Set (C) if Timeout, else Carry Clear (NC), Unit Ready
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; Uses : MTM Timer variable, AF
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BsyWt: LD (MTM),A ; Set Timer value
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BsyW0: LD A,(MTM) ; Get Current Count
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OR A ; Have we timed out?
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SCF ; (Set error flag in case)
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RET Z ; ..exit w/Error flag if So
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IN A,(IDECmd) ; Else Get the Busy Bit
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RLA ; Is it BSY?
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JR C,BSYW0 ; ..loop if So
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RET ; else back to Caller, Carry Clear
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;.....
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; Send command to the IDE Command Register, fall thru to wait for Ready Status
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Cmd_Wt: LD A,(hdComd) ; Get Command Byte in case bit stripped
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OUT (IDECmd),A ; Start Operation
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;..fall thru to wait for Ready
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;.....
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; Wait for Drive to become Ready (No Timeout)
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; Enter: None
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; Exit : None
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; Uses : AF
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Wt_Rdy: IN A,(IDECmd) ; Get Drive Status
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RLA ; Ready?
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JR C,Wt_Rdy ; ..loop if Not
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RET
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;.....
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; Set registers for Whole Block Move
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HDDMOV: LD HL,(DATADR) ; Get ptr to User's Area
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LD DE,HSTBUF ; Pt to local Host Buffer
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LD BC,512 ; set length
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RET ; ..and return
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;.....
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; Set banks for Interbank move
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IF BANKED
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SHDBNK: LD A,(USP-1) ; Get Source Bank Byte
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RRA ; shift to
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RRA ;
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RRA ; Bank #
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AND 1FH ; Mask off any Junk
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LD C,A ; position
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LD A,(SYSBNK) ; Get System Bank
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LD B,A ; position it too
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RET ; and return
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ENDIF ;banked
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IF BANKED
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COMMON /B2RAM/
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ELSE
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DSEG
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ENDIF
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HRTrys: DEFS 1 ; Retry counter storage
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hdUnit: DEFS 1 ; IDE Drive (0 = Master, 1 = Slave)
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hdTrks: DEFS 2 ; Number of Tracks on IDE Drive
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hdHds: DEFS 1 ; Number of Heads on IDE Drive
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hdSPT: DEFS 1 ; Number of Sectors-Per-Track on IDE Drive
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; IDE Command Block for User Direct Driver Access
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hdComd: DEFS 1 ; Command Byte
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hdBMap: DEFS 1 ; Bit Map (B6..0) of Following Bytes to Set
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hdHead: DEFS 1 ; Head Number/Number of Heads in B3..0
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hdTrkH: DEFS 1 ; Hi-Track (Cylinder) Byte
|
||
hdTrkL: DEFS 1 ; Lo-Track (Cylinder) Byte
|
||
hdSec: DEFS 1 ; Sector Number
|
||
hdSCnt: DEFS 1 ; Sector Count
|
||
hdErr: DEFS 1 ; Error Reg Value
|
||
hdDigO: DEFS 1 ; Digital Output Reg Value
|
||
CMDSIZ EQU $-hdComd ; Size of Command Block
|
||
|
||
DATADR: DEFS 2 ; Pointer to User Buffer Space (user bank)
|
||
IF NOWAIT
|
||
WTSAVE: DEFS 1 ; Storage for Entry Wait State Setting
|
||
ENDIF
|
||
;======================= End of HARDIDE ===========================
|
||
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