| developer | d92db59 | 2022-04-13 17:09:05 +0800 | [diff] [blame] | 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 */ |