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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2008 by Michael Sevakis
*
* RoLo firmware restart code for IMX31
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "config.h"
#include "cpu.h"
/****************************************************************************
* void rolo_restart_firmware(const unsigned char* source, unsigned char* dest,
* int length) __attribute__((noreturn));
*/
.section .text, "ax", %progbits
.align 2
.global rolo_restart_firmware
rolo_restart_firmware:
adr r4, restart_copy_start
adr r5, restart_copy_end
ldr r6, =IRAM_BASE_ADDR
mov r7, r6
@ Copy stub to IRAM
1:
ldr r8, [r4], #4
str r8, [r7], #4
cmp r5, r4
bhi 1b
@ Branch to stub
bx r6
restart_copy_start:
@ Trivial copy of firmware to final location
mov r4, r1
1:
subs r2, r2, #1
ldrb r7, [r0], #1
strb r7, [r4], #1
bge 1b
@ Clean and invalidate all caches
mov r0, #0
mcr p15, 0, r0, c7, c14, 0
mcr p15, 0, r0, c7, c5, 0
mcr p15, 0, r0, c7, c10, 4
mcr p15, 0, r0, c7, c5, 4
@ Branch to destination (should be address 0x00000000)
bx r1
restart_copy_end:
.size rolo_restart,.-rolo_restart
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