rockbox/firmware/target/arm/imx31/rolo_restart.S

66 lines
2 KiB
ArmAsm

/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2008 by Michael Sevakis
*
* RoLo restart code for IMX31
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* 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(const unsigned char* source, unsigned char* dest,
* int length) __attribute__((noreturn));
*/
.section .text, "ax", %progbits
.align 2
.global rolo_restart
rolo_restart:
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