63 lines
1.1 KiB
ArmAsm
63 lines
1.1 KiB
ArmAsm
/*
|
|
* \brief Startup code for core
|
|
* \author Martin Stein
|
|
* \author Stefan Kalkowski
|
|
* \date 2011-10-01
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2011-2013 Genode Labs GmbH
|
|
*
|
|
* This file is part of the Genode OS framework, which is distributed
|
|
* under the terms of the GNU General Public License version 2.
|
|
*/
|
|
|
|
/************
|
|
** Macros **
|
|
************/
|
|
|
|
/* core includes */
|
|
.include "macros.s"
|
|
|
|
|
|
.section ".text.crt0"
|
|
|
|
/**********************************
|
|
** Startup code for primary CPU **
|
|
**********************************/
|
|
|
|
.global _start
|
|
_start:
|
|
|
|
/* idle a little initially because U-Boot likes it this way */
|
|
mov r8, r8
|
|
mov r8, r8
|
|
mov r8, r8
|
|
mov r8, r8
|
|
mov r8, r8
|
|
mov r8, r8
|
|
mov r8, r8
|
|
mov r8, r8
|
|
|
|
/* zero-fill BSS segment */
|
|
ldr r0, =_bss_start
|
|
ldr r1, =_bss_end
|
|
mov r2, #0
|
|
1:
|
|
cmp r1, r0
|
|
ble 2f
|
|
str r2, [r0]
|
|
add r0, r0, #4
|
|
b 1b
|
|
2:
|
|
|
|
/* setup temporary stack pointer */
|
|
_get_constraints_of_kernel_stacks r0, r1
|
|
add sp, r0, r1
|
|
|
|
/* kernel-initialization */
|
|
bl init_kernel
|
|
|
|
/* catch erroneous return of the kernel initialization routine */
|
|
1: b 1b
|