1 // SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
2 /*
3 * libfdt - Flat Device Tree manipulation
4 * Copyright (C) 2014 David Gibson <david@gibson.dropbear.id.au>
5 * Copyright (C) 2018 embedded brains GmbH
6 */
7 #include "libfdt_env.h"
8
9 #include <fdt.h>
10 #include <libfdt.h>
11
12 #include "libfdt_internal.h"
13
14 static int fdt_cells(const void *fdt, int nodeoffset, const char *name)
15 {
16 const fdt32_t *c;
17 uint32_t val;
18 int len;
19
20 c = fdt_getprop(fdt, nodeoffset, name, &len);
21 if (!c)
22 return len;
23
24 if (len != sizeof(*c))
25 return -FDT_ERR_BADNCELLS;
26
27 val = fdt32_to_cpu(*c);
28 if (val > FDT_MAX_NCELLS)
29 return -FDT_ERR_BADNCELLS;
30
31 return (int)val;
32 }
33
34 int fdt_address_cells(const void *fdt, int nodeoffset)
35 {
36 int val;
37
38 val = fdt_cells(fdt, nodeoffset, "#address-cells");
39 if (val == 0)
40 return -FDT_ERR_BADNCELLS;
41 if (val == -FDT_ERR_NOTFOUND)
42 return 2;
43 return val;
44 }
45
46 int fdt_size_cells(const void *fdt, int nodeoffset)
47 {
48 int val;
49
50 val = fdt_cells(fdt, nodeoffset, "#size-cells");
51 if (val == -FDT_ERR_NOTFOUND)
52 return 1;
53 return val;
54 }
55
56 /* This function assumes that [address|size]_cells is 1 or 2 */
57 int fdt_appendprop_addrrange(void *fdt, int parent, int nodeoffset,
58 const char *name, uint64_t addr, uint64_t size)
59 {
60 int addr_cells, size_cells, ret;
61 uint8_t data[sizeof(fdt64_t) * 2], *prop;
62
63 ret = fdt_address_cells(fdt, parent);
64 if (ret < 0)
65 return ret;
66 addr_cells = ret;
67
68 ret = fdt_size_cells(fdt, parent);
69 if (ret < 0)
70 return ret;
71 size_cells = ret;
72
73 /* check validity of address */
74 prop = data;
75 if (addr_cells == 1) {
76 if ((addr > UINT32_MAX) || (((uint64_t) UINT32_MAX + 1 - addr) < size))
77 return -FDT_ERR_BADVALUE;
78
79 fdt32_st(prop, (uint32_t)addr);
80 } else if (addr_cells == 2) {
81 fdt64_st(prop, addr);
82 } else {
83 return -FDT_ERR_BADNCELLS;
84 }
85
86 /* check validity of size */
87 prop += addr_cells * sizeof(fdt32_t);
88 if (size_cells == 1) {
89 if (size > UINT32_MAX)
90 return -FDT_ERR_BADVALUE;
91
92 fdt32_st(prop, (uint32_t)size);
93 } else if (size_cells == 2) {
94 fdt64_st(prop, size);
95 } else {
96 return -FDT_ERR_BADNCELLS;
97 }
98
99 return fdt_appendprop(fdt, nodeoffset, name, data,
100 (addr_cells + size_cells) * sizeof(fdt32_t));
101 }
102
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