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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/firmware/dsp56k/bootstrap.asm
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; Author: Frederik Noring <noring@nocrew.org>

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;

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; This file is subject to the terms and conditions of the GNU General Public

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; License.  See the file COPYING in the main directory of this archive

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; for more details.

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; DSP56k loader

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; Host Interface

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M_BCR   EQU     $FFFE           ; Port A Bus Control Register

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M_PBC   EQU     $FFE0           ; Port B Control Register

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M_PBDDR EQU     $FFE2           ; Port B Data Direction Register

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M_PBD   EQU     $FFE4           ; Port B Data Register

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M_PCC   EQU     $FFE1           ; Port C Control Register

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M_PCDDR EQU     $FFE3           ; Port C Data Direction Register

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M_PCD   EQU     $FFE5           ; Port C Data Register

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M_HCR   EQU     $FFE8           ; Host Control Register

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M_HSR   EQU     $FFE9           ; Host Status Register

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M_HRX   EQU     $FFEB           ; Host Receive Data Register

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M_HTX   EQU     $FFEB           ; Host Transmit Data Register

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; SSI, Synchronous Serial Interface

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M_RX    EQU     $FFEF           ; Serial Receive Data Register

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M_TX    EQU     $FFEF           ; Serial Transmit Data Register

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M_CRA   EQU     $FFEC           ; SSI Control Register A

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M_CRB   EQU     $FFED           ; SSI Control Register B

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M_SR    EQU     $FFEE           ; SSI Status Register

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M_TSR   EQU     $FFEE           ; SSI Time Slot Register

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; Exception Processing

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M_IPR   EQU     $FFFF           ; Interrupt Priority Register

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        org     P:$0

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start   jmp     <$40

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        org     P:$40

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;       ; Zero 16384 DSP X and Y words

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;       clr     A #0,r0

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;       clr     B #0,r4

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;       do      #64,<_block1

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;       rep     #256

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;       move    A,X:(r0)+ B,Y:(r4)+

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;_block1        ; Zero (32768-512) Program words

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;       clr     A #512,r0

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;       do      #126,<_block2

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;       rep     #256

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;       move    A,P:(r0)+

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;_block2

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        ; Copy DSP program control

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        move    #real,r0

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        move    #upload,r1

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        do      #upload_end-upload,_copy

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        movem    P:(r0)+,x0

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        movem    x0,P:(r1)+

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_copy   movep   #4,X:<<M_HCR

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        movep   #$c00,X:<<M_IPR

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        and     #<$fe,mr

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        jmp     upload

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real

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        org     P:$7ea9

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upload

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        movep   #1,X:<<M_PBC

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        movep   #0,X:<<M_BCR

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next    jclr    #0,X:<<M_HSR,*

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        movep   X:<<M_HRX,A

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        move    #>3,x0

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        cmp     x0,A #>1,x0

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        jeq     <$0

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_get_address

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        jclr    #0,X:<<M_HSR,_get_address

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        movep   X:<<M_HRX,r0

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_get_length

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        jclr    #0,X:<<M_HSR,_get_length

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        movep   X:<<M_HRX,y0

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        cmp     x0,A #>2,x0

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        jeq     load_X

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        cmp     x0,A

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        jeq     load_Y

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load_P  do      y0,_load_P

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        jclr    #0,X:<<M_HSR,*

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        movep   X:<<M_HRX,P:(r0)+

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_load_P jmp     next

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load_X  do      y0,_load_X

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        jclr    #0,X:<<M_HSR,*

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        movep   X:<<M_HRX,X:(r0)+

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_load_X jmp     next

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load_Y  do      y0,_load_Y

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        jclr    #0,X:<<M_HSR,*

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        movep   X:<<M_HRX,Y:(r0)+

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_load_Y jmp     next

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upload_end

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        end

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