1*4882a593Smuzhiyun /* SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause) */
2*4882a593Smuzhiyun #ifndef LIBFDT_ENV_H
3*4882a593Smuzhiyun #define LIBFDT_ENV_H
4*4882a593Smuzhiyun /*
5*4882a593Smuzhiyun * libfdt - Flat Device Tree manipulation
6*4882a593Smuzhiyun * Copyright (C) 2006 David Gibson, IBM Corporation.
7*4882a593Smuzhiyun * Copyright 2012 Kim Phillips, Freescale Semiconductor.
8*4882a593Smuzhiyun */
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun #include <stdbool.h>
11*4882a593Smuzhiyun #include <stddef.h>
12*4882a593Smuzhiyun #include <stdint.h>
13*4882a593Smuzhiyun #include <stdlib.h>
14*4882a593Smuzhiyun #include <string.h>
15*4882a593Smuzhiyun #include <limits.h>
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun #ifdef __CHECKER__
18*4882a593Smuzhiyun #define FDT_FORCE __attribute__((force))
19*4882a593Smuzhiyun #define FDT_BITWISE __attribute__((bitwise))
20*4882a593Smuzhiyun #else
21*4882a593Smuzhiyun #define FDT_FORCE
22*4882a593Smuzhiyun #define FDT_BITWISE
23*4882a593Smuzhiyun #endif
24*4882a593Smuzhiyun
25*4882a593Smuzhiyun typedef uint16_t FDT_BITWISE fdt16_t;
26*4882a593Smuzhiyun typedef uint32_t FDT_BITWISE fdt32_t;
27*4882a593Smuzhiyun typedef uint64_t FDT_BITWISE fdt64_t;
28*4882a593Smuzhiyun
29*4882a593Smuzhiyun #define EXTRACT_BYTE(x, n) ((unsigned long long)((uint8_t *)&x)[n])
30*4882a593Smuzhiyun #define CPU_TO_FDT16(x) ((EXTRACT_BYTE(x, 0) << 8) | EXTRACT_BYTE(x, 1))
31*4882a593Smuzhiyun #define CPU_TO_FDT32(x) ((EXTRACT_BYTE(x, 0) << 24) | (EXTRACT_BYTE(x, 1) << 16) | \
32*4882a593Smuzhiyun (EXTRACT_BYTE(x, 2) << 8) | EXTRACT_BYTE(x, 3))
33*4882a593Smuzhiyun #define CPU_TO_FDT64(x) ((EXTRACT_BYTE(x, 0) << 56) | (EXTRACT_BYTE(x, 1) << 48) | \
34*4882a593Smuzhiyun (EXTRACT_BYTE(x, 2) << 40) | (EXTRACT_BYTE(x, 3) << 32) | \
35*4882a593Smuzhiyun (EXTRACT_BYTE(x, 4) << 24) | (EXTRACT_BYTE(x, 5) << 16) | \
36*4882a593Smuzhiyun (EXTRACT_BYTE(x, 6) << 8) | EXTRACT_BYTE(x, 7))
37*4882a593Smuzhiyun
fdt16_to_cpu(fdt16_t x)38*4882a593Smuzhiyun static inline uint16_t fdt16_to_cpu(fdt16_t x)
39*4882a593Smuzhiyun {
40*4882a593Smuzhiyun return (FDT_FORCE uint16_t)CPU_TO_FDT16(x);
41*4882a593Smuzhiyun }
cpu_to_fdt16(uint16_t x)42*4882a593Smuzhiyun static inline fdt16_t cpu_to_fdt16(uint16_t x)
43*4882a593Smuzhiyun {
44*4882a593Smuzhiyun return (FDT_FORCE fdt16_t)CPU_TO_FDT16(x);
45*4882a593Smuzhiyun }
46*4882a593Smuzhiyun
fdt32_to_cpu(fdt32_t x)47*4882a593Smuzhiyun static inline uint32_t fdt32_to_cpu(fdt32_t x)
48*4882a593Smuzhiyun {
49*4882a593Smuzhiyun return (FDT_FORCE uint32_t)CPU_TO_FDT32(x);
50*4882a593Smuzhiyun }
cpu_to_fdt32(uint32_t x)51*4882a593Smuzhiyun static inline fdt32_t cpu_to_fdt32(uint32_t x)
52*4882a593Smuzhiyun {
53*4882a593Smuzhiyun return (FDT_FORCE fdt32_t)CPU_TO_FDT32(x);
54*4882a593Smuzhiyun }
55*4882a593Smuzhiyun
fdt64_to_cpu(fdt64_t x)56*4882a593Smuzhiyun static inline uint64_t fdt64_to_cpu(fdt64_t x)
57*4882a593Smuzhiyun {
58*4882a593Smuzhiyun return (FDT_FORCE uint64_t)CPU_TO_FDT64(x);
59*4882a593Smuzhiyun }
cpu_to_fdt64(uint64_t x)60*4882a593Smuzhiyun static inline fdt64_t cpu_to_fdt64(uint64_t x)
61*4882a593Smuzhiyun {
62*4882a593Smuzhiyun return (FDT_FORCE fdt64_t)CPU_TO_FDT64(x);
63*4882a593Smuzhiyun }
64*4882a593Smuzhiyun #undef CPU_TO_FDT64
65*4882a593Smuzhiyun #undef CPU_TO_FDT32
66*4882a593Smuzhiyun #undef CPU_TO_FDT16
67*4882a593Smuzhiyun #undef EXTRACT_BYTE
68*4882a593Smuzhiyun
69*4882a593Smuzhiyun #ifdef __APPLE__
70*4882a593Smuzhiyun #include <AvailabilityMacros.h>
71*4882a593Smuzhiyun
72*4882a593Smuzhiyun /* strnlen() is not available on Mac OS < 10.7 */
73*4882a593Smuzhiyun # if !defined(MAC_OS_X_VERSION_10_7) || (MAC_OS_X_VERSION_MAX_ALLOWED < \
74*4882a593Smuzhiyun MAC_OS_X_VERSION_10_7)
75*4882a593Smuzhiyun
76*4882a593Smuzhiyun #define strnlen fdt_strnlen
77*4882a593Smuzhiyun
78*4882a593Smuzhiyun /*
79*4882a593Smuzhiyun * fdt_strnlen: returns the length of a string or max_count - which ever is
80*4882a593Smuzhiyun * smallest.
81*4882a593Smuzhiyun * Input 1 string: the string whose size is to be determined
82*4882a593Smuzhiyun * Input 2 max_count: the maximum value returned by this function
83*4882a593Smuzhiyun * Output: length of the string or max_count (the smallest of the two)
84*4882a593Smuzhiyun */
fdt_strnlen(const char * string,size_t max_count)85*4882a593Smuzhiyun static inline size_t fdt_strnlen(const char *string, size_t max_count)
86*4882a593Smuzhiyun {
87*4882a593Smuzhiyun const char *p = memchr(string, 0, max_count);
88*4882a593Smuzhiyun return p ? p - string : max_count;
89*4882a593Smuzhiyun }
90*4882a593Smuzhiyun
91*4882a593Smuzhiyun #endif /* !defined(MAC_OS_X_VERSION_10_7) || (MAC_OS_X_VERSION_MAX_ALLOWED <
92*4882a593Smuzhiyun MAC_OS_X_VERSION_10_7) */
93*4882a593Smuzhiyun
94*4882a593Smuzhiyun #endif /* __APPLE__ */
95*4882a593Smuzhiyun
96*4882a593Smuzhiyun #endif /* LIBFDT_ENV_H */
97