1/*
2 * Copyright (C) 2013 - ARM Ltd
3 * Author: Marc Zyngier <marc.zyngier@arm.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
16 */
17
18#include <common.h>
19#include <errno.h>
20#include <log.h>
21#include <stdio_dev.h>
22#include <linux/ctype.h>
23#include <linux/types.h>
24#include <linux/libfdt.h>
25#include <fdt_support.h>
26#include <asm/armv7.h>
27#include <asm/psci.h>
28
29int armv7_apply_memory_carveout(u64 *start, u64 *size)
30{
31#ifdef CONFIG_ARMV7_SECURE_RESERVE_SIZE
32	if (*start + *size < CONFIG_ARMV7_SECURE_BASE ||
33	    *start >= (u64)CONFIG_ARMV7_SECURE_BASE +
34		      CONFIG_ARMV7_SECURE_RESERVE_SIZE)
35		return 0;
36
37	/* carveout must be at the beginning or the end of the bank */
38	if (*start == CONFIG_ARMV7_SECURE_BASE ||
39	    *start + *size == (u64)CONFIG_ARMV7_SECURE_BASE +
40			      CONFIG_ARMV7_SECURE_RESERVE_SIZE) {
41		if (*size < CONFIG_ARMV7_SECURE_RESERVE_SIZE) {
42			debug("Secure monitor larger than RAM bank!?\n");
43			return -EINVAL;
44		}
45		*size -= CONFIG_ARMV7_SECURE_RESERVE_SIZE;
46		if (*start == CONFIG_ARMV7_SECURE_BASE)
47			*start += CONFIG_ARMV7_SECURE_RESERVE_SIZE;
48		return 0;
49	}
50	debug("Secure monitor not located at beginning or end of RAM bank\n");
51	return -EINVAL;
52#else /* !CONFIG_ARMV7_SECURE_RESERVE_SIZE */
53	return 0;
54#endif
55}
56
57int psci_update_dt(void *fdt)
58{
59#ifdef CONFIG_ARMV7_NONSEC
60	if (!armv7_boot_nonsec())
61		return 0;
62#endif
63#ifndef CONFIG_ARMV7_SECURE_BASE
64	/* secure code lives in RAM, keep it alive */
65	fdt_add_mem_rsv(fdt, (unsigned long)__secure_start,
66			__secure_end - __secure_start);
67#endif
68
69	return fdt_psci(fdt);
70}
71