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f708a05d61
sst_sectsize git-svn-id: svn://svn.cc65.org/cc65/trunk@1495 b7a2c559-68d2-44c3-8de9-860c34a00d81
91 lines
1.6 KiB
ArmAsm
91 lines
1.6 KiB
ArmAsm
;
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; Christian Groessler, October 2000
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;
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; This file provides the __sio_call function
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; The function does a SIO call, it's not completely
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; generic (e.g. transfer size is fixed), it's used
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; to save space with _dio_read and _dio_write functions.
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;
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; unsigned char __fastcall__ _sio_call(dhandle_t handle,
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; sectnum_t sect_num,
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; void *buffer,
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; unsigned int sio_val);
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; dhandle_t - 16bit (ptr)
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; sectnum_t - 16bit
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; sio_val is (sio_command | sio_direction << 8)
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;
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.export __sio_call
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.include "atari.inc"
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.import popa,popax
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.import sectsizetab,__oserror
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.importzp ptr1
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.proc __sio_call
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sta DCOMND ; set command into DCB
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stx DSTATS ; set data flow directon
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jsr popax ; get buffer address
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sta DBUFLO ; set buffer address into DCB
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stx DBUFHI
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jsr popax
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sta DAUX1 ; set sector #
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stx DAUX2
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jsr popax
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sta ptr1
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stx ptr1+1
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ldy #sst_flag
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lda (ptr1),y
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and #128
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beq _inv_hand ; handle not open or invalid
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ldy #sst_driveno
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lda (ptr1),y
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clc
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adc #1
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sta DUNIT ; unit number (d1,d2,d3,...)
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lda DAUX2 ; high byte sector #
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bne _realsz
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lda DAUX1
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cmp #4 ; sectors 1 to 3 are special (always 128 bytes)
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bcs _realsz
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lda #$80
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sta DBYTLO
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asl a
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sta DBYTHI
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beq _cont
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_realsz:ldy #sst_sectsize
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lda (ptr1),y
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sta DBYTLO
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iny
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lda (ptr1),y
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sta DBYTHI
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_cont: lda #DISKID ; SIO bus ID of diskette drive
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sta DDEVIC
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lda #15
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sta DTIMLO ; value got from DOS source
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jsr SIOV ; execute
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ldx #0
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lda DSTATS
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bmi _req_err ; error occurred
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txa ; no error occurred
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_req_err:
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sta __oserror
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rts
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_inv_hand:
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ldx #0
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lda #BADIOC
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bne _req_err
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.endproc
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