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