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/*===========================================================================*/
/* Copyright (C) 2001 Authors                                                */
/*                                                                           */
/* This source file may be used and distributed without restriction provided */
/* that this copyright statement is not removed from the file and that any   */
/* derivative work contains the original copyright notice and the associated */
/* disclaimer.                                                               */
/*                                                                           */
/* This source file is free software; you can redistribute it and/or modify  */
/* it under the terms of the GNU Lesser General Public License as published  */
/* by the Free Software Foundation; either version 2.1 of the License, or    */
/* (at your option) any later version.                                       */
/*                                                                           */
/* This source is distributed in the hope that it will be useful, but WITHOUT*/
/* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or     */
/* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public       */
/* License for more details.                                                 */
/*                                                                           */
/* You should have received a copy of the GNU Lesser General Public License  */
/* along with this source; if not, write to the Free Software Foundation,    */
/* Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA        */
/*                                                                           */
/*===========================================================================*/
/*                          HARDWARE MULTIPLIER                              */
/*---------------------------------------------------------------------------*/
/* Test the hardware multiplier:                                             */
/*                                - MPYS  mode.                              */
/*                                                                           */
/* Author(s):                                                                */
/*             - Olivier Girard,    olgirard@gmail.com                       */
/*                                                                           */
/*---------------------------------------------------------------------------*/
/* $Rev: 18 $                                                                */
/* $LastChangedBy: olivier.girard $                                          */
/* $LastChangedDate: 2009-08-04 23:44:12 +0200 (Tue, 04 Aug 2009) $          */
/*===========================================================================*/

.global main

.set   WDTCTL, 0x0120

.set   MPY,    0x0130
.set   MPYS,   0x0132
.set   MAC,    0x0134
.set   MACS,   0x0136
.set   OP2,    0x0138
.set   RESLO,  0x013A
.set   RESHI,  0x013C
.set   SUMEXT, 0x013E
        
        
main:
        
        /* --------------   SIGNED MULTIPLICATION   --------------- */

        ;; Disable watchdog
        mov #0x5A80, &WDTCTL
        
        ;; Initialize variables
        mov #0x0000, R15
        mov #0x0000, R8
        mov #0x0000, R9
        
mpy_loop:       

        ;; Initialize RESLO and RESHI to make sure it is overwritten
        mov #0x0000, &RESLO
        mov #0xC000, &RESHI

        ;; Perform unsigned R8*R9
        mov R8, &MPYS
        mov R9, &OP2

        ;; Read result
        mov &RESLO,  R10
        mov &RESHI,  R11
        mov &SUMEXT, R12

        ;; Notify verilog checker
        add #1, R15
        
        ;; Update next OP1 (R8)
        cmp #0xF0F0, R8
        jeq op2_update

        mov #0x00FF, R7
        and R8, R7
        cmp #0x00F0, R7
        jeq op1_hi_update

        add #0x0010, R8
        jmp mpy_loop
  op1_hi_update:        
        and #0xff00, R8
        add #0x1000, R8
        jmp mpy_loop

        
        ;; Update next OP2 (R9)
  op2_update:
        cmp #0xF0F0, R9
        jeq end_of_test
        
        mov #0x0000, R8

        mov #0x00FF, R7
        and R9, R7
        cmp #0x00F0, R7
        jeq op2_hi_update

        add #0x0010, R9
        jmp mpy_loop
  op2_hi_update:        
        and #0xff00, R9
        add #0x1000, R9
        jmp mpy_loop



        /* ----------------------         END OF TEST        --------------- */
end_of_test:
        nop
        br #0xffff




        /* ----------------------         INTERRUPT VECTORS  --------------- */

.section .vectors, "a"
.word end_of_test  ; Interrupt  0 (lowest priority)    <unused>
.word end_of_test  ; Interrupt  1                      <unused>
.word end_of_test  ; Interrupt  2                      <unused>
.word end_of_test  ; Interrupt  3                      <unused>
.word end_of_test  ; Interrupt  4                      <unused>
.word end_of_test  ; Interrupt  5                      <unused>
.word end_of_test  ; Interrupt  6                      <unused>
.word end_of_test  ; Interrupt  7                      <unused>
.word end_of_test  ; Interrupt  8                      <unused>
.word end_of_test  ; Interrupt  9                      <unused>
.word end_of_test  ; Interrupt 10                      Watchdog timer
.word end_of_test  ; Interrupt 11                      <unused>
.word end_of_test  ; Interrupt 12                      <unused>
.word end_of_test  ; Interrupt 13                      <unused>
.word end_of_test  ; Interrupt 14                      NMI
.word main         ; Interrupt 15 (highest priority)   RESET