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[/] [amber/] [trunk/] [hw/] [tests/] [cache_flush.S] - Rev 20
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/*****************************************************************
// //
// Amber 2 Core Instruction Test //
// //
// This file is part of the Amber project //
// http://www.opencores.org/project,amber //
// //
// Description //
// Tests the cache flush function. Does a flush in the middle //
// of a sequence of data reads. Checks that all the data //
// reads are correct. //
// //
// Author(s): //
// - Conor Santifort, csantifort.amber@gmail.com //
// //
//////////////////////////////////////////////////////////////////
// //
// Copyright (C) 2010 Authors and OPENCORES.ORG //
// //
// 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, download it //
// from http://www.opencores.org/lgpl.shtml //
// //
*****************************************************************/
#include "amber_registers.h"
.section .text
.globl main
main:
@ ---------------------
@ Enable the cache
@ ---------------------
mov r0, #0x00000001
mcr 15, 0, r0, cr3, cr0, 0 @ cacheable area
mov r0, #1
mcr 15, 0, r0, cr2, cr0, 0 @ cache enable
nop
nop
@ Write to a block of memory that straddles
@ across a cache region boundary so that
@ the first 16 bytes are cacheable and
@ the second 16 are not
ldr r0, AdrTestBase
mov r2, #0x20
1: subs r2, r2, #1
str r2, [r0], #4
bne 1b
@ loop a few times so that
@ the instructions will be caches on the second and
@ subsequent passes
mov r7, #7
@ Read back the same block
loop: ldr r3, AdrTestBase
mov r5, #0x20
mov r6, #0
2: ldr r4, [r3], #4
add r6, r6, r4
@ Flush the cache when the r7 loop count value is even
@ a write of any value to cp15, reg 1 will trigger a flush
ands r8, r7, #1
cmpeq r5, #21
cmpne r5, #0x100
mcreq 15, 0, r0, cr1, cr0, 0 @ cache enable
subs r5, r5, #1
bne 2b
@ Check that the sum of the data reads is correct
cmp r6, #0x1f0
movne r10, #10
bne testfail
subs r7, r7, #1
bne loop
b testpass
@ ------------------------------------------
@ ------------------------------------------
testfail:
ldr r11, AdrTestStatus
str r10, [r11]
b testfail
testpass:
ldr r11, AdrTestStatus
mov r10, #17
str r10, [r11]
b testpass
/* Write 17 to this address to generate a Test Passed message */
AdrTestStatus: .word ADR_AMBER_TEST_STATUS
AdrTestBase : .word 0x001fffc0
/* sum of numbers 0 to 2047 inclusive */
MagicNumber1024 : .word 523776
MagicNumber2048 : .word 2096128
/* ========================================================================= */
/* ========================================================================= */
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