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54 lines
1.1 KiB
ArmAsm
54 lines
1.1 KiB
ArmAsm
;
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; Oliver Schmidt, 24.03.2005
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;
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; dhandle_t __fastcall__ dio_open (driveid_t drive_id);
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;
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; drive_id = (slot * 2) + (drive - 1)
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.export _dio_open
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.import decaxy, return0
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.include "zeropage.inc"
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.include "errno.inc"
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.include "mli.inc"
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_dio_open:
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; Convert drive id into unit number
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lsr
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bcc :+
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ora #%00001000
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: asl
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asl
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asl
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asl
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sta mliparam + MLI::ON_LINE::UNIT_NUM
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; Alloc 16-byte buffer just below stack
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ldy #16
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lda sp
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ldx sp+1
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jsr decaxy
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sta mliparam + MLI::ON_LINE::DATA_BUFFER
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stx mliparam + MLI::ON_LINE::DATA_BUFFER+1
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; Get device state
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lda #ON_LINE_CALL
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ldx #ON_LINE_COUNT
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jsr callmli
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bcc :+
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; DIO level access doesn't necessarily need a
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; ProDOS 8 disk so ignore "high level" errors
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cmp #$40
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bcc oserr
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; Return success
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: lda mliparam + MLI::ON_LINE::UNIT_NUM
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ldx #$00
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stx __oserror
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rts
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; Return oserror
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oserr: sta __oserror
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jmp return0
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