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gohigh
2024-02-19 00:25:23 -05:00
parent b1306b38b1
commit f3774e2f8c
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study/sabre/os/files/Sound/SoundBlaster/SBDETECT.ASM Normal file
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WAIT_TIME EQU 000FFh
DSP_INTRQ_CMD EQU 000F2h
DATA SEGMENT WORD PUBLIC
EXTRN SBInt : WORD;
EXTRN SBIrq : WORD;
ORG_INT2_ADDX DD 0;
ORG_INT3_ADDX DD 0;
ORG_INT5_ADDX DD 0;
ORG_INT7_ADDX DD 0;
DATA ENDS
CODE SEGMENT WORD PUBLIC
ASSUME CS:CODE,DS:DATA
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
;
; ResetDSP - reset the DSP
;
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
ResetDSP PROC
MOV DX,SBInt
ADD DL,6 ; DX = DSP reset port 2x6h
MOV AL,1
OUT DX,AL ; write 1, then wait 3 micro-seconds
IN AL,DX ; read value from DSP
RDSP05:
INC AL
JNZ RDSP05 ; wait until AL = 0
OUT DX,AL ; write 0
MOV CL,20H ; set reset timeout value
RDSP10:
CALL ReadDSPTime ; read from DSP
CMP AL,0AAH ; if byte is 0AAh then
JE RDSP20 ; DSP is reset, exit
LOOP RDSP10 ; not reset, try again
MOV AX,2 ; set I/O failure error
JMP SHORT RDSP90 ; exit;
RDSP20:
XOR AX,AX ; clear AX, no error
RDSP90:
OR AX,AX ; set flags for return
RET
ResetDSP ENDP
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;
; ReadDSPTime - read from DSP with timeout
;
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
ReadDSPTime PROC
PUSH CX
PUSH DX
MOV DX,SBInt
ADD DL,0EH ; DX = DSP data available port 2xEh
MOV CX,WAIT_TIME ; load timeout value into CX
RDT10:
IN AL,DX ; check to see if DSP is ready
OR AL,AL
JS RDT20 ; if sign set, then DSP read ready
LOOP RDT10 ; not ready, keep waiting
STC ; set error, DSP read timeout
JMP SHORT RDT90 ; exit
RDT20:
SUB DL,4 ; DX = DSP read data port 2xAh
IN AL,DX ; read byte from DSP
CLC ; clear error
RDT90:
POP DX
POP CX
RET
ReadDSPTime ENDP
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
;
; CheckSBInt - detect DMA interrupt
;
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
PUBLIC CheckSBInt
CheckSBInt PROC FAR
push bp
mov bp,sp
MOV AL,2 ; setup end of DMA
MOV DX,OFFSET DUMMY_DMA_INT2 ; interrupts for all
MOV BX,OFFSET DATA:ORG_INT2_ADDX ; possible IRQs
CALL SetupInterrupt ; (2, 3, 5, and 7)
MOV AL,3
MOV DX,OFFSET DUMMY_DMA_INT3
MOV BX,OFFSET DATA:ORG_INT3_ADDX
CALL SetupInterrupt
MOV AL,5
MOV DX,OFFSET DUMMY_DMA_INT5
MOV BX,OFFSET DATA:ORG_INT5_ADDX
CALL SetupInterrupt
MOV AL,7
MOV DX,OFFSET DUMMY_DMA_INT7
MOV BX,OFFSET DATA:ORG_INT7_ADDX
CALL SetupInterrupt
MOV SBIrq,0 ; reset current IRQ
MOV DX,SBInt
ADD DX,0CH ; DX = DSP write port 2xCh
MOV AL,DSP_INTRQ_CMD ; AL = interrupt request command
CALL WriteDSP ; write command to DSP
XOR AX,AX ; assume success
MOV CX,WAIT_TIME ; load timeout value into CX
CLD
VI10:
CMP SBIrq,0 ; see if interrupt has been changed
JNE VI90 ; if so, continue
LOOP VI10 ; if not, keep waiting
MOV AX,0FFh ; set DMA failure error
VI90:
PUSH AX ; save result variable
MOV AL,2 ; restore end of DMA
MOV BX,OFFSET DATA:ORG_INT2_ADDX ; interrupts
CALL RestoreInterrupt
MOV AL,3
MOV BX,OFFSET DATA:ORG_INT3_ADDX
CALL RestoreInterrupt
MOV AL,5
MOV BX,OFFSET DATA:ORG_INT5_ADDX
CALL RestoreInterrupt
MOV AL,7
MOV BX,OFFSET DATA:ORG_INT7_ADDX
CALL RestoreInterrupt
POP AX ; restore result
OR AX,AX
mov sp,bp
pop bp
RET
CheckSBInt ENDP
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
;
; WriteDSP
;
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
WriteDSP PROC
PUSH CX
MOV AH,AL ; save value in AL for later
MOV CX,WAIT_TIME
WD10:
IN AL,DX ; check to see if DSP is ready
OR AL,AL
JNS WD20 ; if sign set, DSP not write ready
LOOP WD10
WD20:
MOV AL,AH ; restore AL
OUT DX,AL ; send byte to DSP
POP CX
RET
WriteDSP ENDP
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
;
; SetupInterrupt
;
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
SetupInterrupt PROC
PUSH BX
PUSH CX
PUSH DX
CLI
MOV CL,AL ; preserve interrupt number for use
ADD AL,8 ; calculate interrupt vector addx
CBW
SHL AL,1
SHL AL,1
MOV DI,AX
PUSH ES ; setup and preserve interrupt
XOR AX,AX
MOV ES,AX
MOV AX,ES:[DI]
MOV [BX],AX
MOV ES:[DI],DX
MOV AX,ES:[DI+2]
MOV [BX+2],AX
MOV ES:[DI+2],CS
POP ES
MOV AH,1 ; enable interrupt control mask-bit
SHL AH,CL
NOT AH
IN AL,21H
AND AL,AH
OUT 21H,AL
STI
POP DX
POP CX
POP BX
RET
SetupInterrupt ENDP
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
;
; RestoreInterrupt
;
; ENTRY: AL = INTERRUPT NUM
; BX = offset to stored addx
;
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
RestoreInterrupt PROC
CLI
MOV CL,AL
ADD AL,8 ; calculate interrupt vector addx
CBW
SHL AL,1
SHL AL,1
MOV DI,AX
PUSH ES ; restore interrupt vector
XOR AX,AX
MOV ES,AX
MOV AX,[BX]
MOV ES:[DI],AX
MOV AX,[BX+2]
MOV ES:[DI+2],AX
POP ES
MOV AH,1
SHL AH,CL
IN AL,21H
OR AL,AH
OUT 21H,AL
STI
RET
RestoreInterrupt ENDP
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
;
; DUMMY INTERRUPTS - used for interrupt detection
;
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
DUMMY_DMA_INT2 PROC FAR
PUSH DX
MOV DX,2
JMP SHORT DUMMY_DMA_ISR
DUMMY_DMA_INT2 ENDP
DUMMY_DMA_INT3 PROC FAR
PUSH DX
MOV DX,3
JMP SHORT DUMMY_DMA_ISR
DUMMY_DMA_INT3 ENDP
DUMMY_DMA_INT5 PROC FAR
PUSH DX
MOV DX,5
JMP SHORT DUMMY_DMA_ISR
DUMMY_DMA_INT5 ENDP
DUMMY_DMA_INT7 PROC FAR
PUSH DX
MOV DX,7
DUMMY_DMA_ISR:
PUSH AX
PUSH DS
MOV AX,DATA
MOV DS,AX
MOV SBIrq,DX ; update interrupt variable with
; number of interrupt called
MOV DX,SBInt
ADD DX,0EH ; DX = DSP data available port 2xEh
IN AL,DX ; acknowledge DSP interrupt
MOV AL,20H ; send EOI (end of interrupt) to
OUT 20H,AL ; interrupt controller port 20h
POP DS
POP AX
POP DX
IRET ; interrupt return
DUMMY_DMA_INT7 ENDP
CODE ENDS
END