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Assembly Source File | 1984-08-05 | 12.5 KB | 293 lines

; Subroutine.: DISKSTAT.ASM ; Author.....: Kelly Mc Tiernan ; Date.......: 1983 ; Notice.....: Copyright 1983, Kelly Mc Tiernan, All Rights Reserved ; Notes......: CP/M-80 disk drive status routine. ; BDOS EQU 00005H FDPB EQU 1FH FALV EQU 1BH FDSK EQU 19H FCHG EQU 0EH ; ORG 42000 ; START: SHLD SAVEHL ; SAVE HL REG PAIR MVI C,FDSK ; DETERMINE CURRENT DISK PUSH H ; SAVE HL CALL BDOS ; STA SAVDSK ; AND SAVE TO RESTORE POP H ; GET IT BACK INX H ; POINT TO FIRST BYTE OF VARIABLE MOV A,M ; GET IT ORA A ; CLEAR CARRY SBI 41H ; CONVERT ASCII A,B,C TO 0,1,2,.. CPI 10H ; LEGAL DRIVE NAME? JNC KEEPDR ; NO, KEEP CURRENT DRIVE MOV E,A ; GET DRIVE TO SELECT MVI C,FCHG ; SELECT FUNCTION CALL BDOS ; ; KEEPDR: LXI H,0000H ; TO SAVE SP DAD SP ; GET SP SHLD SAVESP ; SAVE IT MVI A,01H ; TO INIT. SIG. DIGIT POINTER LXI H,ANSWER ; WHERE IT GOES MOV M,A ; INITIALIZE MVI C,FDPB ; GET DPB ADDRESS CALL BDOS ; HL HAS ADDRESS SHLD DPBADR ; SAVE BASE ADDRESS LXI B,0005H ; OFFSET TO DSM DAD B ; MOV E,M ; GET FIRST BYTE INX H ; FOR NEXT BYTE MOV D,M ; GET IT XCHG ; GET WHERE IT CAN BE USED MVI B,03H ; COUNT FOR SHIFT DIV8: ORA A ; CLEAR CARRY FOR DIVISION MOV A,H ; GET FIRST BYTE RAR ; DIVIDE BY 2 MOV H,A ; RESTORE HIGH BYTE MOV A,L ; GET LOW BYTE RAR ; DIVIDE BY 2 (SHIFT IN HB CARRY) MOV L,A ; RESTORE IT DCR B ; FOR COUNT JNZ DIV8 ; CONTINUE 3 TIMES (2*2*2=8)è INX H ; +1=ALV LENGTH SHLD ALVLNG ; SAVE LENGTH OF ALV ; ; NOW CALCULATE BLOCK SIZE FOR DRIVE ; LHLD DPBADR ; GET BACK BLOCK ADDRESS INX H ; VECTOR INTO DPB FOR BSH INX H ; MOV E,M ; GET IT MVI D,00H ; ZERO HB DCX D ; FOR VECTOR INTO TABLE DCX D ; DCX D ; MOV A,E ; GET IT ORA A ; CLEAR CARRY RAL ; MULTIPLY BY 2 MOV E,A ; GET BACK VECTOR LXI H,TABLE ; BASE ADDRESS DAD D ; ADD IN VECTOR MOV E,M ; GET LB (STORED LB,HB) INX H ; NEXT BYTE MOV D,M ; DE NOW CONTAINS BLOCK SIZE XCHG ; GET IT TO WHERE WE CAN SAVE IT SHLD BLS ; SAVE IT ; ; ; NOW LET'S DETERMINE SPACE LEFT ON DISK ; MVI C,FALV ; LET'S GET ALV ADDRESS NOW CALL BDOS ; HL CONTAINS ADDRESS LDA ALVLNG ; GET LENGTH MOV B,A ; INTO COUNTER 1 LXI D,0000H ; BIT COUNTER ZEROED DCX H ; SET FOR LOOP CONTROL SHLD TEMP ; SAVE HL DI ; DISABLE INTERRUPTS BEFORE SP ; CHANGE LHLD BLS ; GET BLOCK SIZE SPHL ; FOR ADDITION LXI H,0000H ; INITIALIZE SHLD SIZE0 ; " " SHLD SIZE1 ; " " BITCNT: LHLD TEMP ; RESTORE HL INX H ; POINT TO BYTE MVI C,08H ; COUNTER 2 FOR BITS/BYTE MOV A,M ; GET FIRST BYTE ORA A ; CLEAR CARRY SHLD TEMP ; SAVE HL POINTER BIT1: LHLD SIZE0 ; GET LOW WORD TOTAL RAR ; ROTATE A TO COUNT ZERO BITS JC BIT2 ; DON'T COUNT 1'S DAD SP ; IF UNALLOC. THEN ADD 1 BLOCK ; TO TTL. JNC BIT2 ; IF NO CARRY FROM DAD H INX D ; ELSE ADD 1 TO HIGH WORDèBIT2: SHLD SIZE0 ; SAVE NEW LOW WORD FOR UNALLOC. DCR C ; COUNTER JNZ BIT1 ; NEXT BIT DCR B ; COUNT FOR BYTES JNZ BITCNT ; DO NEXT BYTE XCHG ; GET HIGH WORD INTO HL SHLD SIZE1 ; SAVE IT LHLD SIZE0 ; FOR CORRECTION FACTOR LXI SP,0E000H ; ERROR OFFSET DAD SP ; TWO'S COMP. OF 2000H (SUBTRACT ; OFFSET) SHLD SIZE0 ; SAVE RESULT JC EX1 ; EXIT IF CARRY (LOW WORD > ; 2000H) LHLD SIZE1 ; FOR BORROW DCX H ; SUBTRACT 1 SHLD SIZE1 ; SAVE RESULT EX1: LHLD SAVESP ; RESTORE STACK POINTER SPHL ; EI ; ENABLE INTERRUPTS ; ; ; NOW WE CONVERT TO A DECIMAL STRING ; LXI H,ANSWER+1 ; TO INITIAIZE DATA AREA MVI B,0AH ; COUNTER MVI A,00H ; INITIALIZE TO 0 INIT1: MOV M,A ; INX H ; NEXT BYTE DCR B ; JNZ INIT1 ; REPEAT FOR 10 BYTES MVI C,0AH ; TOTAL # OF SIG DIGITS COUNTER LXI H,SIZE0 ; POINTER TO LOWEST BYTE XCHG ; SAVE IT LXI H,TBL2 ; POINT TO SUBTRACTION TABLE XCHG ; GET BACK DATA TABLE ADDRESS MINUS: ORA A ; CLEAR CARRY FOR LOW BYTE MVI B,03H ; COUNTER FOR SUBS MIN0: MOV A,M ; GET DATA XCHG ; GET SUB TABLE POINTER SBB M ; SUBTRACT DIGIT INX H ; POINT TO NEXT TABLE ENTRY XCHG ; GET BACK DATA POINTER MOV M,A ; PUT BACK RESULT INX H ; POINT TO NEXT DATA BYTE DCR B ; DONE WITH LOW 3 BYTES ? JNZ MIN0 ; CHECK FOR NEG ON LAST BYTE SBB LAST1: MOV A,M ; GET MOST SIG BYTE XCHG ; GET TABLE POINTER SBB M ; SUBTRACT IT DI ; DISABLE INTERUPTS BEFORE CALL CP AD1 ; ADD 1 TO SIG DIGIT IF IT WENT EI ; ENABLE INTERUPTS ON RETURN DCX H ; MOVE POINTER BACK TO BEGINNING DCX H ; OF TABLEè DCX H ; XCHG ; GET BACK DATA POINTER MOV M,A ; PUT BACK RESULT DCX H ; MOVE POINTER BACK TO BEGINNING DCX H ; OF DATA DCX H ; DI ; DISABLE INTERUPTS CM PUTBK ; PUT BACK IF NEG AND MOVE ON EI ; ENABLE INTERUPTS DCR C ; ONLY TO OVERRIDE SBB M INR C ; JNZ MINUS ; NO, DO AGAIN ; ; ; NOW LETS CONVERT TO ASCII (ADD 30H) AND PASS BACK ; TO 10 DIGIT DBASE VARIABLE ; LXI H,ANSWER+1 ; POINT TO ANSWER BUFFER MVI B,0AH ; FOR ALL 10 BYTES FILL: MVI A,30H ; TO CONVERT TO ASCII ADD M ; UNPACKED BCD+30=ASCII MOV M,A ; PUT CORRECTED ANSWER BACK INX H ; NEXT DIGIT DCR B ; DONE ? JNZ FILL ; LHLD SAVEHL ; OLD HL POINTER (VERY OLD) MOV A,M ; LET'S DO A LITTLE ERROR ; CHECKING CPI 0AH ; JNZ ERROR ; VARIABLE WRONG LENGTH INX H ; NOW LET'S GIVE dBASE THE ANSWER XCHG ; I KINDA LIKE THIS INSTRUCTION LXI H,ANSWER+1 ; SHOULD BE OBVIOUS BY NOW MVI B,0AH ; COUNTER TO MOVE BYTES PASS: MOV A,M ; GET BYTE INX H ; FOR NEXT BYTE XCHG ; WHERE TO SEND MOV M,A ; SEND IT INX H ; WHERE TO SEND NEXT ONE XCHG ; BACK TO SOURCE POINTER DCR B ; COUNTER FOR BYTES PASSED JNZ PASS ; DO NEXT BYTE JMP FINIS ; NORMAL END OF ROUTINE ERROR: INX H ; POINT TO FIRST BYTE MVI A,'E' ; ERROR CODE MOV M,A ; SEND ERROR CODE TO DBASE FINIS: LDA SAVDSK ; GET BACK DISK IN USE NO. MOV E,A ; PUT IN E FOR BDOS CALL MVI C,FCHG ; FUNCTION TO CHANGE DISK CALL BDOS ; BACK TO ORIGINAL DRIVE LHLD SAVESP ; RESTORE SP SPHL ; LHLD SAVEHL ; RESTORE HL RET ;è; ; SUBROUTINES FOR CALCULATIONS ; PUTBK: ORA A ; CLEAR CARRY MVI B,04H ; COUNTER FOR ADDS PUT1: MOV A,M ; GET DATA XCHG ; POINT TO SUB TABLE ADC M ; ADD BACK IN AMMOUNT INX H ; POINT TO NEXT SUB TABLE BYTE XCHG ; BACK TO DATA POINTER MOV M,A ; PUT BACK RESULT INX H ; POINT TO NEXT DATA BYTE DCR B JNZ PUT1 ; NEXT BYTE DCX H ; RESET DATA POINTER DCX H ; DCX H ; DCX H ; PUSH H ; SAVE HL LXI H,ANSWER ; POINT TO SIG DIGIT POINTER INR M ; INCREMENT TO NEXT DIGIT POP H ; RESTORE HL DCR C ; COUNT FOR SIG DIGITS DONE RET ; RETURN TO CALLER ; AD1: PUSH PSW ; SAVE REGISTERS PUSH B ; PUSH D ; PUSH H ; LXI H,ANSWER ; ANSWER TABLE MOV E,M ; GET POSITION MVI D,00H ; FOR VECTOR DAD D ; VECTOR TO SIG DIGIT INR M ; ADD 1 TO DIGIT POP H ; RESTORE REGISTERS POP D ; POP B ; POP PSW ; RET ; ; SAVEHL: DS 2 SAVESP: DS 2 DPBADR: DS 2 ALVLNG: DS 2 BLS: DS 2 TEMP: DS 2 SAVDSK: DS 1 ; TABLE: DB 00H DB 04H DB 00H DB 08H DB 00H DB 10H DB 00Hè DB 20H DB 00H DB 40H ; SIZE0: DS 2 SIZE1: DS 2 ; ; ANSWER: DS 10H ; TOTAL SIG DIGITS+POINTER ; TBL2: DB 000H,0CAH,09AH,03BH DB 000H,0E1H,0F5H,005H DB 080H,096H,098H,000H DB 040H,042H,00FH,000H DB 0A0H,086H,001H,000H DB 010H,027H,000H,000H DB 0E8H,003H,000H,000H DB 064H,000H,000H,000H DB 00AH,000H,000H,000H DB 001H,000H,000H,000H ; END