1 /* $NetBSD: libfdt_env.h,v 1.5 2019/12/22 12:33:17 skrll Exp $ */ 2 3 /* SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause) */ 4 #ifndef LIBFDT_ENV_H 5 #define LIBFDT_ENV_H 6 /* 7 * libfdt - Flat Device Tree manipulation 8 * Copyright (C) 2006 David Gibson, IBM Corporation. 9 * Copyright 2012 Kim Phillips, Freescale Semiconductor. 10 */ 11 12 #if defined(_KERNEL) || defined(_STANDALONE) 13 #include <sys/param.h> 14 #include <sys/types.h> 15 #include <lib/libkern/libkern.h> 16 #else 17 #include <stdbool.h> 18 #include <stddef.h> 19 #include <stdint.h> 20 #include <stdlib.h> 21 #include <string.h> 22 #include <limits.h> 23 #endif 24 25 #ifdef __CHECKER__ 26 #define FDT_FORCE __attribute__((force)) 27 #define FDT_BITWISE __attribute__((bitwise)) 28 #else 29 #define FDT_FORCE 30 #define FDT_BITWISE 31 #endif 32 33 typedef uint16_t FDT_BITWISE fdt16_t; 34 typedef uint32_t FDT_BITWISE fdt32_t; 35 typedef uint64_t FDT_BITWISE fdt64_t; 36 37 #define EXTRACT_BYTE(x, n) ((unsigned long long)((uint8_t *)&x)[n]) 38 #define CPU_TO_FDT16(x) ((EXTRACT_BYTE(x, 0) << 8) | EXTRACT_BYTE(x, 1)) 39 #define CPU_TO_FDT32(x) ((EXTRACT_BYTE(x, 0) << 24) | (EXTRACT_BYTE(x, 1) << 16) | \ 40 (EXTRACT_BYTE(x, 2) << 8) | EXTRACT_BYTE(x, 3)) 41 #define CPU_TO_FDT64(x) ((EXTRACT_BYTE(x, 0) << 56) | (EXTRACT_BYTE(x, 1) << 48) | \ 42 (EXTRACT_BYTE(x, 2) << 40) | (EXTRACT_BYTE(x, 3) << 32) | \ 43 (EXTRACT_BYTE(x, 4) << 24) | (EXTRACT_BYTE(x, 5) << 16) | \ 44 (EXTRACT_BYTE(x, 6) << 8) | EXTRACT_BYTE(x, 7)) 45 46 static inline uint16_t fdt16_to_cpu(fdt16_t x) 47 { 48 return (FDT_FORCE uint16_t)CPU_TO_FDT16(x); 49 } 50 static inline fdt16_t cpu_to_fdt16(uint16_t x) 51 { 52 return (FDT_FORCE fdt16_t)CPU_TO_FDT16(x); 53 } 54 55 static inline uint32_t fdt32_to_cpu(fdt32_t x) 56 { 57 return (FDT_FORCE uint32_t)CPU_TO_FDT32(x); 58 } 59 static inline fdt32_t cpu_to_fdt32(uint32_t x) 60 { 61 return (FDT_FORCE fdt32_t)CPU_TO_FDT32(x); 62 } 63 64 static inline uint64_t fdt64_to_cpu(fdt64_t x) 65 { 66 return (FDT_FORCE uint64_t)CPU_TO_FDT64(x); 67 } 68 static inline fdt64_t cpu_to_fdt64(uint64_t x) 69 { 70 return (FDT_FORCE fdt64_t)CPU_TO_FDT64(x); 71 } 72 #undef CPU_TO_FDT64 73 #undef CPU_TO_FDT32 74 #undef CPU_TO_FDT16 75 #undef EXTRACT_BYTE 76 77 #ifdef __APPLE__ 78 #include <AvailabilityMacros.h> 79 80 /* strnlen() is not available on Mac OS < 10.7 */ 81 # if !defined(MAC_OS_X_VERSION_10_7) || (MAC_OS_X_VERSION_MAX_ALLOWED < \ 82 MAC_OS_X_VERSION_10_7) 83 84 #define strnlen fdt_strnlen 85 86 /* 87 * fdt_strnlen: returns the length of a string or max_count - which ever is 88 * smallest. 89 * Input 1 string: the string whose size is to be determined 90 * Input 2 max_count: the maximum value returned by this function 91 * Output: length of the string or max_count (the smallest of the two) 92 */ 93 static inline size_t fdt_strnlen(const char *string, size_t max_count) 94 { 95 const char *p = memchr(string, 0, max_count); 96 return p ? p - string : max_count; 97 } 98 99 #endif /* !defined(MAC_OS_X_VERSION_10_7) || (MAC_OS_X_VERSION_MAX_ALLOWED < 100 MAC_OS_X_VERSION_10_7) */ 101 102 #endif /* __APPLE__ */ 103 104 #endif /* LIBFDT_ENV_H */ 105