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[/] [amber/] [trunk/] [hw/] [tests/] [firq.S] - Rev 66
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/*****************************************************************
// //
// Amber 2 Core Interrupt Test //
// //
// This file is part of the Amber project //
// http://www.opencores.org/project,amber //
// //
// Description //
// Tests Fast Interrupt //
// Executes 20 FIRQs randomly while executing a small loop //
// of code. Test checks the full set of FIRQ registers (r8 to //
// r14) and will only pass if all interrupts are handled //
// correctly //
// //
// 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:
@ ---------------------
@ Interrupt Vector Table
@ ---------------------
/* 0x00 Reset Interrupt vector address */
b start
/* 0x04 Undefined Instruction Interrupt vector address */
b testfail
/* 0x08 SWI Interrupt vector address */
b testfail
/* 0x0c Prefetch abort Interrupt vector address */
b testfail
/* 0x10 Data abort Interrupt vector address */
b testfail
b testfail
/* 0x18 IRQ vector address */
b testfail
/* 0x1c FIRQ vector address */
b service_firq
start:
/* Switch to User Mode */
/* and unset interrupt mask bits */
mov r0, #0x00000000
teqp pc, r0
@ Check that we're in user mode now
mov r2, pc
ands r2, r2, #3
movne r10, #10
bne testfail
@ Set up
mov r1, #0
mov r3, #20 @ Number of times to run the outer loop of the test
@ set the firq timer to trigger a firq request
mloop:
ldr r4, AdrRanNum
ldr r5, [r4]
and r5, r5, #0x3f
add r5, r5, #15
ldr r6, AdrFIRQTimer
str r5, [r6]
@ loop forever
loop: mov r8, #0x17
mov r9, #0x39
mov r10, #0x87
mov r11, #0x14
mov r12, #0x97
mov r13, #0x52
mov r7, #0
add r7, r8, r7
add r7, r9, r7
add r7, r10, r7
add r7, r11, r7
add r7, r12, r7
add r7, r13, r7
@ only jump to check regs after an interrupt has occurred.
@ The interrupt service routine sets r1 to a 1
@ and the check_regs sequence sets it back to 0
cmp r1, #1
beq check_regs
b loop
nop
loop1: @ This lable needs to be 1 instruction after the end of the
@ loop. The interrupt lr address is current instruction address + 4
@ so if the interrupt hits on the b loop, then the FIRQ lr will
@ be 2 instructions after the end of the loop
service_firq:
@ Now in FIRQ mode
@ Turn off the FIRQ interrupt count down trigger by writing a zero to it
ldr r10, AdrFIRQTimer
mov r11, #0
str r11, [r10]
@ Check that the FIRQ Link Register (r14) got the correct return address
@ Don't know exactly when the interrupt occurred so check the range loop to loop1
ldr r2, Adrloop
ldr r13, PCMask
and r13, lr, r13
cmp r13, r2
movlt r10, #100
blt testfail
ldr r2, Adrloop1
cmp r13, r2
movgt r10, #110
bgt testfail
@ save a 1 to r1, this will exit the loop to testpass
mov r1, #1
mov r8, #0x10
mov r9, #0x20
mov r10, #0x30
mov r11, #0x40
mov r12, #0x50
mov r13, #0x60
@ Jump straight back to normal execution, returning to user mode
subs pc, r14, #4
check_regs:
mov r1, #0
ldr r6, Sum
cmp r7, r6
movne r10, #15
bne testfail
cmp r8, #0x17
movne r10, #20
bne testfail
cmp r9, #0x39
movne r10, #30
bne testfail
cmp r10, #0x87
movne r10, #40
bne testfail
cmp r11, #0x14
movne r10, #50
bne testfail
cmp r12, #0x97
movne r10, #60
bne testfail
cmp r13, #0x52
movne r10, #70
bne testfail
cmp r3, #0
beq testpass
sub r3, r3, #1
b mloop
@ ------------------------------------------
@ ------------------------------------------
testfail:
ldr r11, AdrTestStatus
str r10, [r11]
b testfail
testpass:
ldr r11, AdrTestStatus
mov r10, #17
str r10, [r11]
b testpass
@ ------------------------------------------
@ ------------------------------------------
AdrTestStatus: .word ADR_AMBER_TEST_STATUS
AdrRanNum: .word ADR_AMBER_TEST_RANDOM_NUM
AdrFIRQTimer: .word ADR_AMBER_TEST_FIRQ_TIMER
Adrloop: .word loop
Adrloop1: .word loop1
Sum: .word 0x1d4
PCMask: .word 0x03fffffc
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