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/*
        OR1200 MAC test

        Very basic, testing simple instructions and multiplication,
        accumulation values

        Julius Baxter, julius.baxter@orsoc.se
        
*/
//////////////////////////////////////////////////////////////////////
////                                                              ////
//// Copyright (C) 2010 Authors and OPENCORES.ORG                 ////
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//// This source file may be used and distributed without         ////
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//// 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; ////
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//// useful, but WITHOUT ANY WARRANTY; without even the implied   ////
//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR      ////
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//////////////////////////////////////////////////////////////////////
        
        
#include "spr-defs.h"
#include "board.h"
#include "or1200-defines.h"

// Check MAC unit is enabled before trying to run this test
#ifndef OR1200_MAC_IMPLEMENTED  
# error
# error No MAC unit detected. This test requires hardware MAC support
# error
#endif

        
/* =================================================== [ exceptions ] === */
        .section .vectors, "ax"


/* ---[ 0x100: RESET exception ]----------------------------------------- */
        .org 0x100      
        l.movhi r0, 0
        /* Clear status register */
        l.ori r1, r0, SPR_SR_SM
        l.mtspr r0, r1, SPR_SR
        /* Clear timer  */
        l.mtspr r0, r0, SPR_TTMR

        /* Jump to program initialisation code */
        .global _start
        l.movhi r4, hi(_start)
        l.ori r4, r4, lo(_start)
        l.jr    r4
        l.nop


/* =================================================== [ text ] === */
        .section .text

/* =================================================== [ start ] === */ 

        .global _start
_start: 

        /* Instruction cache enable */
        /* Check if IC present and skip enabling otherwise */
        l.mfspr r24,r0,SPR_UPR
        l.andi  r26,r24,SPR_UPR_ICP
        l.sfeq  r26,r0
        l.bf    .L8
        l.nop
        
        /* Disable IC */
        l.mfspr r6,r0,SPR_SR
        l.addi  r5,r0,-1
        l.xori  r5,r5,SPR_SR_ICE
        l.and   r5,r6,r5
        l.mtspr r0,r5,SPR_SR
        
        /* Establish cache block size
        If BS=0, 16;
        If BS=1, 32;
        r14 contain block size
        */
        l.mfspr r24,r0,SPR_ICCFGR
        l.andi  r26,r24,SPR_ICCFGR_CBS
        l.srli  r28,r26,7
        l.ori   r30,r0,16
        l.sll   r14,r30,r28
        
        /* Establish number of cache sets
        r16 contains number of cache sets
        r28 contains log(# of cache sets)
        */
        l.andi  r26,r24,SPR_ICCFGR_NCS
        l.srli  r28,r26,3
        l.ori   r30,r0,1
        l.sll   r16,r30,r28
        
        /* Invalidate IC */
        l.addi  r6,r0,0
        l.sll   r5,r14,r28
        
.L7:
        l.mtspr r0,r6,SPR_ICBIR
        l.sfne  r6,r5
        l.bf    .L7
        l.add   r6,r6,r14
        
        /* Enable IC */
        l.mfspr r6,r0,SPR_SR
        l.ori   r6,r6,SPR_SR_ICE
        l.mtspr r0,r6,SPR_SR
        l.nop
        l.nop
        l.nop
        l.nop
        l.nop
        l.nop
        l.nop
        l.nop

.L8:
        /* Data cache enable */
        /* Check if DC present and skip enabling otherwise */
        l.mfspr r24,r0,SPR_UPR
        l.andi  r26,r24,SPR_UPR_DCP
        l.sfeq  r26,r0
        l.bf    .L10
        l.nop
        /* Disable DC */
        l.mfspr r6,r0,SPR_SR
        l.addi  r5,r0,-1
        l.xori  r5,r5,SPR_SR_DCE
        l.and   r5,r6,r5
        l.mtspr r0,r5,SPR_SR
        /* Establish cache block size
           If BS=0, 16;
           If BS=1, 32;
           r14 contain block size
        */
        l.mfspr r24,r0,SPR_DCCFGR
        l.andi  r26,r24,SPR_DCCFGR_CBS
        l.srli  r28,r26,7
        l.ori   r30,r0,16
        l.sll   r14,r30,r28
        /* Establish number of cache sets
           r16 contains number of cache sets
           r28 contains log(# of cache sets)
        */
        l.andi  r26,r24,SPR_DCCFGR_NCS
        l.srli  r28,r26,3
        l.ori   r30,r0,1
        l.sll   r16,r30,r28
        /* Invalidate DC */
        l.addi  r6,r0,0
        l.sll   r5,r14,r28
.L9:
        l.mtspr r0,r6,SPR_DCBIR
        l.sfne  r6,r5
        l.bf    .L9
        l.add   r6,r6,r14
        /* Enable DC */
        l.mfspr r6,r0,SPR_SR
        l.ori   r6,r6,SPR_SR_DCE
        l.mtspr r0,r6,SPR_SR
.L10:
        // Kick off test
        l.jal   _main
        l.nop
        


/* =================================================== [ main ] === */
        
        .global _main   
_main:
        // First clear MAC
        l.macrc r3
        l.nop 0x2
        // Load a constant into r3
        l.ori   r4, r0, 0x3     // r4 = 3
        l.ori   r5, r0, 0x2     // r5 = 2
        l.ori   r6, r0, 0       // r6 = 0
        l.ori   r7, r0, 0x7     // r7 = 7
        // Test back-to-back l.mac operations
        l.mac   r4, r5          // Multiply: MAC reg 6
        l.mac   r4, r7          // Multiply: MAC reg 27
        l.mac   r5, r5          // Multiply: MAC reg 31
        l.mac   r4, r0          // Multiply: MAC reg 31
        l.mac   r4, r5          // Multiply: MAC reg 37 (0x25)
        l.macrc r3
        l.nop 0x2
        l.sfeqi r3, 0x25
        l.bnf fail
        l.ori r3, r0, 0x1       // Test 1 failed

        // Test back-to-back l.maci operations
        l.maci  r4, 5           // Multiply: MAC reg 15
        l.maci  r4, 8           // Multiply: MAC reg 39
        l.maci  r5, 1           // Multiply: MAC reg 41
        l.maci  r4, 0           // Multiply: MAC reg 41
        l.maci  r4, 3           // Multiply: MAC reg 50 (0x32)
        l.macrc r3
        l.nop 0x2
        l.sfeqi r3, 0x32
        l.bnf fail
        l.ori r3, r0, 0x2       // Test 2 failed
        
        
#define NUM_MAC_LOOPS 8
macloop:        
        l.mac   r4, r5          // Multiply: MAC reg 6
        l.addi  r6, r6, 1       // Increment counter
        l.sfltui r6, NUM_MAC_LOOPS
        l.bf    macloop
        l.nop
        l.macrc r3
        l.nop 0x2
        l.sfeqi r3, (NUM_MAC_LOOPS*6)
        l.bnf   fail
        l.ori   r3, r0, 0x3     // Test 3 failed


        l.movhi r3, 0x8000
        l.ori   r3, r3, 0x000d
        l.nop   0x2
        l.ori   r3, r0, 0
        l.nop   0x1

fail:
        l.nop 0x1