mirror of
https://github.com/InvisibleUp/uvmac.git
synced 2024-11-22 07:31:19 +00:00
278 lines
8.0 KiB
Plaintext
278 lines
8.0 KiB
Plaintext
STRING C
|
|
MACHINE MC68020
|
|
PRINT OFF
|
|
INCLUDE 'SlotEqu.a'
|
|
INCLUDE 'VideoEqu.a'
|
|
INCLUDE 'Traps.a'
|
|
INCLUDE 'SysEqu.a'
|
|
INCLUDE 'SysErr.a'
|
|
PRINT ON
|
|
|
|
VideoDeclROM MAIN
|
|
|
|
;========================================================================================
|
|
|
|
; General Directives
|
|
|
|
BLANKS ON
|
|
STRING ASIS
|
|
|
|
kCmndVideoSetIntEnbl EQU $0003
|
|
kCmndVideoClearInt EQU $0004
|
|
kCmndVideoStatus EQU $0005
|
|
kCmndVideoControl EQU $0006
|
|
|
|
;========================================================================================
|
|
; Local Vars, definitions, etc...
|
|
;========================================================================================
|
|
|
|
;This is device storage, a handle to which is stored in the dCtlStorage field of the DCE.
|
|
|
|
saveSQElPtr EQU 0 ; the SQ element pointer (for
|
|
; _SIRemove
|
|
dCtlSize EQU saveSQElPtr+4 ; size of the dCtlStorage
|
|
|
|
;========================================================================================
|
|
; Video Driver Header
|
|
;========================================================================================
|
|
|
|
VidDrvr
|
|
DC.W $4C00 ; ctl,status,needsLock
|
|
DC.W 0, 0, 0 ; not an ornament
|
|
|
|
;Entry point offset table
|
|
|
|
DC.W VideoOpen - VidDrvr ; open routine
|
|
DC.W VidDrvr - VidDrvr ; no prime
|
|
DC.W VideoCtl - VidDrvr ; control
|
|
DC.W VideoStatus - VidDrvr ; status
|
|
DC.W VideoClose - VidDrvr ; close
|
|
|
|
VideoTitle
|
|
STRING Pascal
|
|
DC.W '.Display_Video_Sample'
|
|
STRING ASIS
|
|
ALIGN 2 ; make sure we're aligned
|
|
DC.W 0 ; version-0
|
|
|
|
;========================================================================================
|
|
;VideoOpen allocates private storage for the device in the DCE and locks
|
|
; it down for perpetuity. It installs the interrupt handler and enables
|
|
; the interrupts. It also sets the default gamma table included in the driver.
|
|
;
|
|
;Entry:
|
|
; A0 = param block pointer
|
|
; A1 = DCE pointer
|
|
;
|
|
;Locals:
|
|
; A2 = Saved param block pointer
|
|
; A3 = Saved DCE pointer
|
|
; A4 = Saved interrupt handler ptr
|
|
;========================================================================================
|
|
|
|
;Save registers
|
|
VideoOpen
|
|
MOVE.L A0, A2 ; A2 <- param block pointer
|
|
MOVE.L A1, A3 ; A3 <- DCE pointer
|
|
|
|
;Allocate private storage
|
|
MOVEQ #dCtlSize, D0 ; get size of parameters
|
|
_ResrvMem ,SYS ; make room as low as possible
|
|
MOVEQ #dCtlSize, D0 ; get size of parameters
|
|
_NewHandle ,SYS,CLEAR ; get some memory for private
|
|
; storage
|
|
BNE OpError ;=> return an error in open
|
|
MOVE.L A0, dCtlStorage(A3) ; saved returned handle in DCE
|
|
_HLock ; and lock it down
|
|
|
|
;Get and install the interrupt handler
|
|
LEA BeginIH, A4 ; Save point to interrupt handler
|
|
MOVEQ #SlotIntQElement.sqHDSize,D0 ; allocate a slot queue element
|
|
_NewPtr ,SYS,CLEAR ; get it from system heap cleared
|
|
BNE OpError
|
|
MOVE.W #SIQType, SlotIntQElement.sqType(A0) ; setup queue ID
|
|
MOVE.L A4, SlotIntQElement.sqAddr(A0) ; setup int routine address
|
|
MOVE.L A3, SlotIntQElement.sqParm(A0) ; save slot base addr as A3 parm
|
|
CLR.L D0
|
|
MOVE.B dctlSlot(A3), D0 ; setup slot #
|
|
_SIntInstall ; and do install
|
|
BNE.S OpError
|
|
|
|
;Save SQElPtr for removal
|
|
MOVE.L dCtlStorage(A3), A1 ; Get point to private storage
|
|
MOVE.L (A1), A1
|
|
MOVE.L A0, saveSQElPtr(A1) ; Save the SQ element pointer
|
|
|
|
;Enable interrupts
|
|
|
|
MOVE.W #1, -(A7) ; enabled
|
|
SUBQ #2, A7 ; result code
|
|
MOVE.W #kCmndVideoSetIntEnbl, -(A7)
|
|
LEA TailData, A0
|
|
MOVE.L (A0)+, -(A7)
|
|
MOVEA.L (A0), A0
|
|
MOVE.L A7, (A0)
|
|
ADDA.W #10, A7
|
|
|
|
MOVEQ #0, D0 ; no error
|
|
BRA.S EndOpen
|
|
|
|
; Error
|
|
OpError
|
|
MOVE.L #openErr, D0 ; say can't open driver
|
|
EndOpen
|
|
RTS
|
|
|
|
;========================================================================================
|
|
; The interrupt handler for the board
|
|
;========================================================================================
|
|
|
|
; On entry A1 contains DCE
|
|
|
|
; wrong! : "D0-D3/A0-A3 have been preserved."
|
|
; (comment from Apples sample code.)
|
|
; must preserve registers except A1/D0
|
|
|
|
BeginIH
|
|
MOVE.L A0, -(A7)
|
|
|
|
; clear interrupt from card
|
|
|
|
SUBQ #2, A7 ; result code
|
|
MOVE.W #kCmndVideoClearInt, -(A7)
|
|
|
|
LEA TailData, A0
|
|
MOVE.L (A0)+, -(A7)
|
|
MOVEA.L (A0), A0
|
|
MOVE.L A7, (A0)
|
|
|
|
ADDQ.W #8, A7
|
|
|
|
MOVE.L dctlDevBase(A1), D0 ; D0 = $Fsxxxxxx
|
|
ROL.L #8, D0 ; D0 <- $xxxxxxFs Convert the
|
|
; address into
|
|
AND #$0F, D0 ; D0 <- $xxxx000x the slot
|
|
; number
|
|
MOVE.L JVBLTask, A0 ; call the VBL task manager
|
|
JSR (A0) ; with slot # in D0
|
|
|
|
MOVE.L (A7)+, A0
|
|
MOVEQ #1, D0 ; signal that int was serviced
|
|
RTS ; and return to caller
|
|
|
|
;========================================================================================
|
|
;
|
|
;VideoClose releases the device's private storage.
|
|
;
|
|
;Entry:
|
|
; A0 = param block pointer
|
|
; A1 = DCE pointer
|
|
;
|
|
;Locals:
|
|
; A2 = Saved param block pointer
|
|
; A3 = Saved DCE pointer
|
|
; A4 = Temporary
|
|
;
|
|
;========================================================================================
|
|
|
|
VideoClose
|
|
|
|
MOVE.L A3, -(A7) ; save
|
|
MOVE.L dCtlStorage(A1), A3; Get pointer to private storage
|
|
|
|
MOVE.W #0, -(A7) ; disabled
|
|
SUBQ #2, A7 ; result code
|
|
MOVE.W #kCmndVideoSetIntEnbl, -(A7)
|
|
LEA TailData, A0
|
|
MOVE.L (A0)+, -(A7)
|
|
MOVEA.L (A0), A0
|
|
MOVE.L A7, (A0)
|
|
ADDA.W #10, A7
|
|
|
|
MOVE.L (A3), A0
|
|
MOVE.L saveSQElPtr(A0), A0 ; Get the SQ element pointer
|
|
_SIntRemove ; Remove the interrupt handler
|
|
|
|
MOVE.L A3, A0 ; Dispose of the private storage
|
|
_DisposHandle
|
|
MOVEQ #0, D0 ; get error into D0
|
|
|
|
MOVE.L (A7)+, A3 ; restore A3
|
|
RTS ; return to caller
|
|
|
|
;========================================================================================
|
|
;
|
|
;Video Driver Control Call Handler.
|
|
;
|
|
; Entry:
|
|
; A0 = param block pointer
|
|
; A1 = DCE pointer
|
|
; Uses:
|
|
; A2 = cs paramaters (i.e. A2 <- csParam(A0)) (must be preserved)
|
|
; A3 = scratch (doesn't need to be preserved)
|
|
; A4 = scratch (must be preserved)
|
|
; D0-D3 = scratch (don't need to be preserved)
|
|
;
|
|
; Exit: D0 = error code
|
|
;
|
|
;========================================================================================
|
|
|
|
;Decode the call
|
|
VideoCtl
|
|
MOVE.L A0, -(A7)
|
|
SUBQ #2, A7 ; result code
|
|
MOVE.W #kCmndVideoControl, -(A7)
|
|
BRA.S VideoStatusControlCommon
|
|
|
|
;========================================================================================
|
|
;
|
|
;Video DriverStatus Call Handler. Right now there are three calls:
|
|
;
|
|
; (2) GetMode
|
|
; (4) GetPage
|
|
; (5) GetPageBase
|
|
;
|
|
; Entry:
|
|
; A0 = param block
|
|
; A1 = DCE pointer
|
|
; Uses:
|
|
; A2 = cs paramaters (i.e. A2 <- csParam(A0)) (must be preserved)
|
|
; A3 = scratch (doesn't need to be preserved)
|
|
; D0-D3 = scratch (don't need to be preserved)
|
|
;
|
|
; Exit: D0 = error code
|
|
;
|
|
;========================================================================================
|
|
|
|
VideoStatus
|
|
MOVE.L A0, -(A7)
|
|
SUBQ #2, A7 ; result code
|
|
MOVE.W #kCmndVideoStatus, -(A7)
|
|
VideoStatusControlCommon
|
|
LEA TailData, A0
|
|
MOVE.L (A0)+, -(A7)
|
|
MOVEA.L (A0), A0
|
|
MOVE.L A7, (A0)
|
|
|
|
ADDA.W #6, A7
|
|
MOVE.W (A7)+, D0 ; save result code
|
|
MOVE.L (A7)+, A0 ; restore A0
|
|
|
|
;========================================================================================
|
|
; Exit from control or status
|
|
;========================================================================================
|
|
|
|
BTST #NoQueueBit,ioTrap(A0) ;no queue bit set?
|
|
BEQ.S GoIODone ;=> no, not immediate
|
|
RTS ;otherwise, it was an immediate call
|
|
|
|
GoIODone
|
|
MOVE.L JIODone,A0 ;get the IODone address
|
|
JMP (A0)
|
|
|
|
TailData
|
|
|
|
ENDP
|
|
|
|
END
|