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80 lines
1.3 KiB
ArmAsm
80 lines
1.3 KiB
ArmAsm
;
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; Christian Groessler, October 2000
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;
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; This file provides the __dio_open and __dio_close functions
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; Since on the Atari no real open and close is necessary, they
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; do not much. The __dio_open sets the sector size of the
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; drive which is later used by the _dio_read and _dio_write
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; functions.
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;
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; dhandle_t __fastcall__ dio_open (driveid_t drive_id);
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; unsigned char __fastcall__ dio_close (dhandle_t handle);
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;
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.export _dio_open,_dio_close
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.export sectsizetab
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.import __oserror
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.importzp ptr1,tmp1
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.include "atari.inc"
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.bss
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sectsizetab:
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.res NUMDRVS * sst_size
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.code
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.proc _dio_open
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cmp #NUMDRVS ; valid drive id?
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bcs _inv_drive
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tay ; drive #
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asl a ; make index from drive id
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asl a
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tax
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lda #128 ; currently hardcoded (until I get an 815 :-)
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sta sectsizetab+sst_sectsize,x
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sta sectsizetab+sst_flag,x ; set flag that drive is "open"
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lda #0
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sta sectsizetab+sst_sectsize+1,x
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sta __oserror ; success
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tya
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sta sectsizetab+sst_driveno,x
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; lda #SSTIDVAL
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; sta sectsizetab+sst_id+1,x
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stx tmp1
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lda #<sectsizetab
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clc
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adc tmp1
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sta tmp1
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lda #>sectsizetab
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adc #0
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tax
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lda tmp1
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rts
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_inv_drive:
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lda #NONDEV ; non-existent device
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sta __oserror
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lda #0
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tax
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rts ; return NULL
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.endproc
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.proc _dio_close
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sta ptr1
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stx ptr1+1
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lda #0
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ldy #sst_flag
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sta (ptr1),y
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sta __oserror ; success
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tax
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rts ; return no error
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.endproc
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