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added _dio_read() and _dio_write() handlers

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git-svn-id: svn://svn.cc65.org/cc65/trunk@349 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
cpg
2000-10-09 22:43:01 +00:00
parent c33f95f88e
commit 84537ae937
2 changed files with 110 additions and 0 deletions
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55
libsrc/atari/dioread.s Normal file
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;
; Christian Groessler, October 2000
;
; this file provides the _dio_read function
;
; unsigned char __fastcall__ _dio_read(_driveid_t drive_id, _sectnum_t sect_num, void *buffer);
; _driveid_t - 8bit
; _sectnum_t - 16bit
;
.export __dio_read
.import popa,popax
.include "atari.inc"
.proc __dio_read
sta DBUFLO ; set buffer address into DCB
stx DBUFHI
jsr popax
sta DAUX1 ; set sector #
stx DAUX2
jsr popa
cmp #16
bcs _inv_dev ; invalid device #
adc #1
sta DUNIT ; unit number (d1,d2,d3,...)
lda #$31 ; D1 (drive_id == 0) has id $31
sta DDEVIC
lda #0
sta DBYTHI ; high byte of bytes to transfer
lda #%01000000 ; indicate i/o direction (read)
sta DSTATS
lda #15
sta DTIMLO ; value got from DOS source
lda #128
sta DBYTLO ; low byte of bytes to transfer
lda #SIO_READ ; read sector
sta DCOMND
jsr SIOV ; execute
ldx #0
lda DSTATS
bmi _req_err ; error occurred
txa ; no error occurred
_req_err:
rts
_inv_dev:
ldx #0
lda #NONDEV ; non-existent device error
rts
.endproc

55
libsrc/atari/diowrite.s Normal file
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;
; Christian Groessler, October 2000
;
; this file provides the _dio_write function
;
; unsigned char __fastcall__ _dio_write(_driveid_t drive_id, _sectnum_t sect_num, void *buffer);
; _driveid_t - 8bit
; _sectnum_t - 16bit
;
.export __dio_write
.import popa,popax
.include "atari.inc"
.proc __dio_write
sta DBUFLO ; set buffer address into DCB
stx DBUFHI
jsr popax
sta DAUX1 ; set sector #
stx DAUX2
jsr popa
cmp #16
bcs _inv_dev ; invalid device #
adc #1
sta DUNIT ; unit number (d1,d2,d3,...)
lda #$31 ; D1 (drive_id == 0) has id $31
sta DDEVIC
lda #0
sta DBYTHI ; high byte of bytes to transfer
lda #%10000000 ; indicate i/o direction (write)
sta DSTATS
lda #15
sta DTIMLO ; value got from DOS source
lda #128
sta DBYTLO ; low byte of bytes to transfer
lda #SIO_WRITE ; write sector
sta DCOMND
jsr SIOV ; execute
ldx #0
lda DSTATS
bmi _req_err ; error occurred
txa ; no error occurred
_req_err:
rts
_inv_dev:
ldx #0
lda #NONDEV ; non-existent device error
rts
.endproc