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73 lines
1.1 KiB
ArmAsm
73 lines
1.1 KiB
ArmAsm
;
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; Christian Groessler, October 2000
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;
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; this file provides the _dio_log_to_phys function
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; (previously called _dio_snum_to_chs, so the filename)
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;
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; on the Atari this function is a dummy, it returns
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; cylinder and head 0 and as sector the sectnum it got
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;
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; unsigned char __fastcall__ dio_log_to_phys(dhandle_t handle,
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; unsigned *sectnum, /* input */
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; dio_phys_pos *physpos); /* output */
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;
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; dhandle_t - 16bit (ptr)
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;
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.export _dio_log_to_phys
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.include "atari.inc"
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.importzp ptr1,ptr2,ptr3
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.import popax,__oserror
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.proc _dio_log_to_phys
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sta ptr2
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stx ptr2+1 ; pointer to output structure
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jsr popax
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sta ptr1
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stx ptr1+1 ; save pointer to input data
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jsr popax
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sta ptr3
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stx ptr3+1 ; pointer to handle
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ldy #sst_flag
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lda (ptr3),y
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and #128
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beq _inv_hand ; handle not open or invalid
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lda #0
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tay
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tax
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sta (ptr2),y ; head
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iny
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sta (ptr2),y ; track (low)
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iny
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sta (ptr2),y ; track (high)
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iny
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lda (ptr1,x)
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sta (ptr2),y
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iny
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inc ptr1
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bne _l1
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inc ptr1+1
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_l1: lda (ptr1,x)
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sta (ptr2),y
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txa
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ret:
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sta __oserror
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rts ; return success
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; invalid handle
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_inv_hand:
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ldx #0
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lda #BADIOC
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bne ret
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.endproc
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