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190 lines
3.1 KiB
ArmAsm
190 lines
3.1 KiB
ArmAsm
;
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; Maciej 'YTM/Elysium' Witkowiak
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; 2.7.2001
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;
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;
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; unsigned char __fastcall__ dio_phys_to_log(dhandle_t handle,
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; dio_phys_pos *physpos, /* input */
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; sectnum_t *sectnum); /* output */
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;
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; dhandle_t - 16bit (ptr)
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; sectnum_t - 16bit
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;
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.export _dio_phys_to_log
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.export sectab_1541_l, sectab_1541_h ; for log_to_phys
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.import popax,__oserror
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.importzp ptr1,ptr2,ptr3,tmp1,tmp2,tmp3,tmp4
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.include "../inc/dio.inc"
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.include "../inc/geossym.inc"
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.include "../inc/const.inc"
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.proc _dio_phys_to_log
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sta ptr1
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stx ptr1+1 ; pointer to result
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jsr popax
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sta ptr2
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stx ptr2+1 ; pointer to input structure
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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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ldy #diopp_head
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lda (ptr2),y
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bne _inv_data ; there is only head 0
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ldy #diopp_track
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lda (ptr2),y
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beq _inv_data ; there is no track 0
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sta tmp1
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iny
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lda (ptr2),y
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bne _inv_data ; there are no more than 256 tracks
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dec tmp1 ; normalize track to start from 0
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ldy #diopp_sector
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lda (ptr2),y
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sta tmp2
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iny
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lda (ptr2),y
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bne _inv_data ; there are no more than 256 sectors
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; tmp1 (int) holds track+sector, translate it using device 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 #%00000011 ; this is for RamDrive compatibility
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cmp #DRV_1541
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beq dio_cts1541
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cmp #DRV_1571
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beq dio_cts1571
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cmp #DRV_1581
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beq dio_cts1581
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; unknown device, return what you have got
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dio_ctsend:
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ldy #1
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lda tmp2
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sta (ptr1),y
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dey
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lda tmp1
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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 #INCOMPATIBLE
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ldx #0
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beq ret
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; device-depended stuff, tmp1=track-1, tmp2=sector
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dio_cts1541:
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ldy tmp1
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cpy #35
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bcs _inv_data
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lda sectab_1541_l,y
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clc
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adc tmp2
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sta tmp1
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lda sectab_1541_h,y
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adc #0
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sta tmp2
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jmp dio_ctsend
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dio_cts1571:
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lda tmp1
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cmp #70
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bcs _inv_data
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cmp #35 ; last track of one side
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bcs _sub35
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jmp dio_cts1541 ; track <=35 - same as 1541
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_sub35:
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sec
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sbc #35
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sta tmp1
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jsr dio_cts1541 ; get offset on second side of disk
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lda tmp1 ; add second side base
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clc
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adc #<683
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sta tmp1
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lda tmp2
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adc #>683
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sta tmp2
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jmp dio_ctsend
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dio_cts1581:
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; 1581 has 80 tracks, 40 sectors each secnum=track*40+sector
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ldx #0
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stx tmp3
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stx tmp4
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lda tmp1
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beq _nomult
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cmp #80
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bcs _inv_data
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; mul40 by Christian Groessler
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sta tmp4
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asl a
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rol tmp3
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asl a
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rol tmp3 ; val * 4
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adc tmp4
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bcc L1
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inc tmp3 ; val * 5
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L1: asl a
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rol tmp3 ; val * 10
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asl a
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rol tmp3
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asl a
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rol tmp3 ; val * 40 = AX
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ldx tmp3
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sta tmp3
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stx tmp4
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_nomult:
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lda tmp2
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clc
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adc tmp3
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sta tmp1
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lda tmp4
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adc #0
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sta tmp2
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jmp dio_ctsend
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.endproc
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.rodata
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sectab_1541_l:
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.byte $00, $15, $2a, $3f, $54, $69, $7e, $93
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.byte $a8, $bd, $d2, $e7, $fc, $11, $26, $3b
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.byte $50, $65, $78, $8b, $9e, $b1, $c4, $d7
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.byte $ea, $fc, $0e, $20, $32, $44, $56, $67
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.byte $78, $89, $9a, $ab
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sectab_1541_h:
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.byte $00, $00, $00, $00, $00, $00, $00, $00
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.byte $00, $00, $00, $00, $00, $01, $01, $01
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.byte $01, $01, $01, $01, $01, $01, $01, $01
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.byte $01, $01, $02, $02, $02, $02, $02, $02
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.byte $02, $02, $02, $02
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