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