xref: /OK3568_Linux_fs/u-boot/arch/powerpc/lib/stack.c (revision 4882a59341e53eb6f0b4789bf948001014eff981) 
1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun  * Copyright (c) 2015 Andreas Bießmann <andreas@biessmann.org>
3*4882a593Smuzhiyun  *
4*4882a593Smuzhiyun  * Copyright (c) 2011 The Chromium OS Authors.
5*4882a593Smuzhiyun  * (C) Copyright 2002-2006
6*4882a593Smuzhiyun  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
7*4882a593Smuzhiyun  *
8*4882a593Smuzhiyun  * (C) Copyright 2002
9*4882a593Smuzhiyun  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
10*4882a593Smuzhiyun  * Marius Groeger <mgroeger@sysgo.de>
11*4882a593Smuzhiyun  *
12*4882a593Smuzhiyun  * SPDX-License-Identifier:	GPL-2.0+
13*4882a593Smuzhiyun  */
14*4882a593Smuzhiyun #include <common.h>
15*4882a593Smuzhiyun 
16*4882a593Smuzhiyun DECLARE_GLOBAL_DATA_PTR;
17*4882a593Smuzhiyun 
arch_reserve_stacks(void)18*4882a593Smuzhiyun int arch_reserve_stacks(void)
19*4882a593Smuzhiyun {
20*4882a593Smuzhiyun 	ulong *s;
21*4882a593Smuzhiyun 
22*4882a593Smuzhiyun 	/* setup stack pointer for exceptions */
23*4882a593Smuzhiyun 	gd->irq_sp = gd->start_addr_sp;
24*4882a593Smuzhiyun 
25*4882a593Smuzhiyun 	/* Clear initial stack frame */
26*4882a593Smuzhiyun 	s = (ulong *)gd->start_addr_sp;
27*4882a593Smuzhiyun 	*s = 0; /* Terminate back chain */
28*4882a593Smuzhiyun 	*++s = 0; /* NULL return address */
29*4882a593Smuzhiyun 
30*4882a593Smuzhiyun 	return 0;
31*4882a593Smuzhiyun }
32