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179 lines
3.7 KiB
ArmAsm
179 lines
3.7 KiB
ArmAsm
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; 2001-07-02, Maciej 'YTM/Elysium' Witkowiak
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; 2015-08-27, Greg King
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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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.export _dio_log_to_phys
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.importzp ptr1,ptr2,ptr3,tmp1,tmp2
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.import popax,___oserror
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.import sectab_1541_l, sectab_1541_h
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.include "dio.inc"
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.include "geossym.inc"
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.include "const.inc"
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_dio_log_to_phys:
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; check device type
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sta ptr1
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stx ptr1+1 ; pointer to result (struct dio_phys_pos)
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jsr popax
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sta ptr2
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stx ptr2+1 ; pointer to input structure (pointer to int)
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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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; fill in all we have
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ldy #diopp_head
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lda #0 ; head 0
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sta (ptr1),y
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ldy #diopp_track+1
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sta (ptr1),y ; track <256
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ldy #diopp_sector+1
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sta (ptr1),y ; sector <256
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ldy #0
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lda (ptr2),y
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sta tmp1
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iny
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lda (ptr2),y
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sta tmp2
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; get drive info
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ldy #sst_driveno
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lda (ptr3),y
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tay
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lda driveType,y
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and #%00001111 ; remove ramDisk flags
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cmp #DRV_1541
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beq dio_stc1541
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cmp #DRV_1571
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beq dio_stc1571
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cmp #DRV_1581
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beq dio_stc1581
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lda #INCOMPATIBLE ; unsupported device
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ldx #0
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beq _ret
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dio_stcend:
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ldy #diopp_track
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lda tmp1
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sta (ptr1),y
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ldy #diopp_sector
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lda tmp2
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sta (ptr1),y
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ldx #0
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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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; errors
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_inv_data:
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lda #INV_TRACK
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.byte $2c
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_inv_hand:
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lda #DEV_NOT_FOUND
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ldx #0
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beq _ret
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dio_stc1541:
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; if 1541:
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; - compare with table to find track
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; - subtract and find sector
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ldx #0 ; index=(track-1)
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_loop41:
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lda tmp2
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cmp sectab_1541_h+1,x
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bne _nxt
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lda tmp1
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cmp sectab_1541_l+1,x
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_nxt: bcc _found
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inx
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cpx #35
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bne _loop41
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beq _inv_data
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_found:
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lda tmp1
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sec
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sbc sectab_1541_l,x
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sta tmp2
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_fndend:
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inx
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stx tmp1
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jmp dio_stcend
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dio_stc1571:
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; if 1571:
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; - check size, if too big - subtract and add 35 to track
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; - fall down to 1541
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lda tmp2
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cmp #>683
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bne _if71
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lda tmp1
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cmp #<683
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_if71: bcc dio_stc1541
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lda tmp1
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sec
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sbc #<683
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sta tmp1
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lda tmp2
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sbc #>683
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sta tmp2
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jsr dio_stc1541 ; will fall through here
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tay
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bne _ret ; result beyond track 70
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ldy #diopp_track
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lda (ptr1),y
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clc
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adc #35
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sta (ptr1),y
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lda #0
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beq _ret
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; if 1581:
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; - subtract 40 in loop (at most 80 times) to find track
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; - the remainder is sector
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dio_stc1581:
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ldx #0 ; index=(track-1)
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_loop81:
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lda tmp2
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bne _sub81
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lda tmp1
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cmp #40
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bcc _got81
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_sub81: lda tmp1
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sec
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sbc #40
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sta tmp1
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lda tmp2
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sbc #0
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sta tmp2
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inx
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cpx #80
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bne _loop81
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beq _inv_data
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_got81: lda tmp1
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sta tmp2
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inx
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stx tmp1
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jmp dio_stcend
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