summaryrefslogtreecommitdiff
path: root/scripts/dtc/libfdt/fdt_addresses.c
blob: 2cc997ea50122fb6f569fed59d5f539939a11669 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
/*
 * libfdt - Flat Device Tree manipulation
 * Copyright (C) 2014 David Gibson <david@gibson.dropbear.id.au>
 * Copyright (C) 2018 embedded brains GmbH
 *
 * libfdt is dual licensed: you can use it either under the terms of
 * the GPL, or the BSD license, at your option.
 *
 *  a) This library is free software; you can redistribute it and/or
 *     modify it under the terms of the GNU General Public License as
 *     published by the Free Software Foundation; either version 2 of the
 *     License, or (at your option) any later version.
 *
 *     This library is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *     GNU General Public License for more details.
 *
 *     You should have received a copy of the GNU General Public
 *     License along with this library; if not, write to the Free
 *     Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
 *     MA 02110-1301 USA
 *
 * Alternatively,
 *
 *  b) Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *     1. Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *     2. Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
 *     CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 *     INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 *     MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 *     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 *     CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 *     SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 *     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 *     HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 *     OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 *     EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
#include "libfdt_env.h"

#include <fdt.h>
#include <libfdt.h>

#include "libfdt_internal.h"

static int fdt_cells(const void *fdt, int nodeoffset, const char *name)
{
	const fdt32_t *c;
	int val;
	int len;

	c = fdt_getprop(fdt, nodeoffset, name, &len);
	if (!c)
		return len;

	if (len != sizeof(*c))
		return -FDT_ERR_BADNCELLS;

	val = fdt32_to_cpu(*c);
	if ((val <= 0) || (val > FDT_MAX_NCELLS))
		return -FDT_ERR_BADNCELLS;

	return val;
}

int fdt_address_cells(const void *fdt, int nodeoffset)
{
	int val;

	val = fdt_cells(fdt, nodeoffset, "#address-cells");
	if (val == -FDT_ERR_NOTFOUND)
		return 2;
	return val;
}

int fdt_size_cells(const void *fdt, int nodeoffset)
{
	int val;

	val = fdt_cells(fdt, nodeoffset, "#size-cells");
	if (val == -FDT_ERR_NOTFOUND)
		return 1;
	return val;
}

/* This function assumes that [address|size]_cells is 1 or 2 */
int fdt_appendprop_addrrange(void *fdt, int parent, int nodeoffset,
			     const char *name, uint64_t addr, uint64_t size)
{
	int addr_cells, size_cells, ret;
	uint8_t data[sizeof(fdt64_t) * 2], *prop;

	ret = fdt_address_cells(fdt, parent);
	if (ret < 0)
		return ret;
	addr_cells = ret;

	ret = fdt_size_cells(fdt, parent);
	if (ret < 0)
		return ret;
	size_cells = ret;

	/* check validity of address */
	prop = data;
	if (addr_cells == 1) {
		if ((addr > UINT32_MAX) || ((UINT32_MAX + 1 - addr) < size))
			return -FDT_ERR_BADVALUE;

		fdt32_st(prop, (uint32_t)addr);
	} else if (addr_cells == 2) {
		fdt64_st(prop, addr);
	} else {
		return -FDT_ERR_BADNCELLS;
	}

	/* check validity of size */
	prop += addr_cells * sizeof(fdt32_t);
	if (size_cells == 1) {
		if (size > UINT32_MAX)
			return -FDT_ERR_BADVALUE;

		fdt32_st(prop, (uint32_t)size);
	} else if (size_cells == 2) {
		fdt64_st(prop, size);
	} else {
		return -FDT_ERR_BADNCELLS;
	}

	return fdt_appendprop(fdt, nodeoffset, name, data,
			      (addr_cells + size_cells) * sizeof(fdt32_t));
}