67 lines
2 KiB
ArmAsm
67 lines
2 KiB
ArmAsm
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2008 by Michael Sevakis
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*
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* RoLo restart code for IMX31
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "config.h"
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#include "cpu.h"
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/****************************************************************************
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* void rolo_restart(const unsigned char* source, unsigned char* dest,
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* int length) __attribute__((noreturn));
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*/
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.section .text, "ax", %progbits
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.align 2
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.global rolo_restart
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rolo_restart:
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adr r4, restart_copy_start
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adr r5, restart_copy_end
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ldr r6, =IRAM_BASE_ADDR
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mov r7, r6
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@ Copy stub to IRAM
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1:
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ldr r8, [r4], #4
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str r8, [r7], #4
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cmp r5, r4
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bhi 1b
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@ Branch to stub
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bx r6
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restart_copy_start:
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@ Trivial copy of firmware to final location
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mov r4, r1
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1:
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subs r2, r2, #1
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ldrb r7, [r0], #1
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strb r7, [r4], #1
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bge 1b
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@ Clean and invalidate all caches
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mov r0, #0
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mcr p15, 0, r0, c7, c14, 0
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mcr p15, 0, r0, c7, c5, 0
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mcr p15, 0, r0, c7, c10, 4
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mcr p15, 0, r0, c7, c5, 4
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@ Branch to destination (should be address 0x00000000)
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bx r1
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restart_copy_end:
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.size rolo_restart,.-rolo_restart
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