1 /* SPDX-License-Identifier: (BSD-2-Clause OR GPL-2.0+) */ 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 * libfdt is dual licensed: you can use it either under the terms of 10 * the GPL, or the BSD license, at your option. 11 * 12 * a) This library is free software; you can redistribute it and/or 13 * modify it under the terms of the GNU General Public License as 14 * published by the Free Software Foundation; either version 2 of the 15 * License, or (at your option) any later version. 16 * 17 * This library is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU General Public License for more details. 21 * 22 * You should have received a copy of the GNU General Public 23 * License along with this library; if not, write to the Free 24 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, 25 * MA 02110-1301 USA 26 * 27 * Alternatively, 28 * 29 * b) Redistribution and use in source and binary forms, with or 30 * without modification, are permitted provided that the following 31 * conditions are met: 32 * 33 * 1. Redistributions of source code must retain the above 34 * copyright notice, this list of conditions and the following 35 * disclaimer. 36 * 2. Redistributions in binary form must reproduce the above 37 * copyright notice, this list of conditions and the following 38 * disclaimer in the documentation and/or other materials 39 * provided with the distribution. 40 * 41 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 42 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, 43 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 44 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 45 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 46 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 47 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 48 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 49 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 50 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 51 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 52 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 53 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 54 */ 55 56 #include <stddef.h> 57 #include <stdint.h> 58 #include <stdlib.h> 59 #include <string.h> 60 61 #ifdef __CHECKER__ 62 #define FDT_FORCE __attribute__((force)) 63 #define FDT_BITWISE __attribute__((bitwise)) 64 #else 65 #define FDT_FORCE 66 #define FDT_BITWISE 67 #endif 68 69 typedef uint16_t FDT_BITWISE fdt16_t; 70 typedef uint32_t FDT_BITWISE fdt32_t; 71 typedef uint64_t FDT_BITWISE fdt64_t; 72 73 #define EXTRACT_BYTE(x, n) ((unsigned long long)((uint8_t *)&x)[n]) 74 #define CPU_TO_FDT16(x) ((EXTRACT_BYTE(x, 0) << 8) | EXTRACT_BYTE(x, 1)) 75 #define CPU_TO_FDT32(x) ((EXTRACT_BYTE(x, 0) << 24) | (EXTRACT_BYTE(x, 1) << 16) | \ 76 (EXTRACT_BYTE(x, 2) << 8) | EXTRACT_BYTE(x, 3)) 77 #define CPU_TO_FDT64(x) ((EXTRACT_BYTE(x, 0) << 56) | (EXTRACT_BYTE(x, 1) << 48) | \ 78 (EXTRACT_BYTE(x, 2) << 40) | (EXTRACT_BYTE(x, 3) << 32) | \ 79 (EXTRACT_BYTE(x, 4) << 24) | (EXTRACT_BYTE(x, 5) << 16) | \ 80 (EXTRACT_BYTE(x, 6) << 8) | EXTRACT_BYTE(x, 7)) 81 82 static inline uint16_t fdt16_to_cpu(fdt16_t x) 83 { 84 return (FDT_FORCE uint16_t)CPU_TO_FDT16(x); 85 } 86 static inline fdt16_t cpu_to_fdt16(uint16_t x) 87 { 88 return (FDT_FORCE fdt16_t)CPU_TO_FDT16(x); 89 } 90 91 static inline uint32_t fdt32_to_cpu(fdt32_t x) 92 { 93 return (FDT_FORCE uint32_t)CPU_TO_FDT32(x); 94 } 95 static inline fdt32_t cpu_to_fdt32(uint32_t x) 96 { 97 return (FDT_FORCE fdt32_t)CPU_TO_FDT32(x); 98 } 99 100 static inline uint64_t fdt64_to_cpu(fdt64_t x) 101 { 102 return (FDT_FORCE uint64_t)CPU_TO_FDT64(x); 103 } 104 static inline fdt64_t cpu_to_fdt64(uint64_t x) 105 { 106 return (FDT_FORCE fdt64_t)CPU_TO_FDT64(x); 107 } 108 #undef CPU_TO_FDT64 109 #undef CPU_TO_FDT32 110 #undef CPU_TO_FDT16 111 #undef EXTRACT_BYTE 112 113 #ifdef __APPLE__ 114 #include <AvailabilityMacros.h> 115 116 /* strnlen() is not available on Mac OS < 10.7 */ 117 # if !defined(MAC_OS_X_VERSION_10_7) || (MAC_OS_X_VERSION_MAX_ALLOWED < \ 118 MAC_OS_X_VERSION_10_7) 119 120 #define strnlen fdt_strnlen 121 122 /* 123 * fdt_strnlen: returns the length of a string or max_count - which ever is 124 * smallest. 125 * Input 1 string: the string whose size is to be determined 126 * Input 2 max_count: the maximum value returned by this function 127 * Output: length of the string or max_count (the smallest of the two) 128 */ 129 static inline size_t fdt_strnlen(const char *string, size_t max_count) 130 { 131 const char *p = memchr(string, 0, max_count); 132 return p ? p - string : max_count; 133 } 134 135 #endif /* !defined(MAC_OS_X_VERSION_10_7) || (MAC_OS_X_VERSION_MAX_ALLOWED < 136 MAC_OS_X_VERSION_10_7) */ 137 138 #endif /* __APPLE__ */ 139 140 #endif /* LIBFDT_ENV_H */ 141