1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright (c) 2015 Andreas Bießmann <andreas@biessmann.org>
4  *
5  * Copyright (c) 2011 The Chromium OS Authors.
6  * (C) Copyright 2002-2006
7  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
8  *
9  * (C) Copyright 2002
10  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
11  * Marius Groeger <mgroeger@sysgo.de>
12  */
13 #include <common.h>
14 #include <init.h>
15 #include <lmb.h>
16 #include <asm/global_data.h>
17 
18 DECLARE_GLOBAL_DATA_PTR;
19 
arch_reserve_stacks(void)20 int arch_reserve_stacks(void)
21 {
22 #ifdef CONFIG_SPL_BUILD
23 	gd->start_addr_sp -= 128;	/* leave 32 words for abort-stack */
24 	gd->irq_sp = gd->start_addr_sp;
25 #else
26 	/* setup stack pointer for exceptions */
27 	gd->irq_sp = gd->start_addr_sp;
28 
29 # if !defined(CONFIG_ARM64)
30 	/* leave 3 words for abort-stack, plus 1 for alignment */
31 	gd->start_addr_sp -= 16;
32 # endif
33 #endif
34 
35 	return 0;
36 }
37 
get_sp(void)38 static ulong get_sp(void)
39 {
40 	ulong ret;
41 
42 	asm("mov %0, sp" : "=r"(ret) : );
43 	return ret;
44 }
45 
arch_lmb_reserve(struct lmb * lmb)46 void arch_lmb_reserve(struct lmb *lmb)
47 {
48 	arch_lmb_reserve_generic(lmb, get_sp(), gd->ram_top, 16384);
49 }
50