diff options
Diffstat (limited to 'hwaccess.h')
| -rw-r--r-- | hwaccess.h | 132 |
1 files changed, 71 insertions, 61 deletions
@@ -2,6 +2,8 @@ * This file is part of the flashrom project. * * Copyright (C) 2009 Carl-Daniel Hailfinger + * Copyright (C) 2022 secunet Security Networks AG + * (written by Thomas Heijligen <thomas.heijligen@secunet.com) * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -20,74 +22,82 @@ #ifndef __HWACCESS_H__ #define __HWACCESS_H__ 1 -#define ___constant_swab8(x) ((uint8_t) ( \ - (((uint8_t)(x) & (uint8_t)0xffU)))) +#include <stdint.h> -#define ___constant_swab16(x) ((uint16_t) ( \ - (((uint16_t)(x) & (uint16_t)0x00ffU) << 8) | \ - (((uint16_t)(x) & (uint16_t)0xff00U) >> 8))) - -#define ___constant_swab32(x) ((uint32_t) ( \ - (((uint32_t)(x) & (uint32_t)0x000000ffUL) << 24) | \ - (((uint32_t)(x) & (uint32_t)0x0000ff00UL) << 8) | \ - (((uint32_t)(x) & (uint32_t)0x00ff0000UL) >> 8) | \ - (((uint32_t)(x) & (uint32_t)0xff000000UL) >> 24))) - -#define ___constant_swab64(x) ((uint64_t) ( \ - (((uint64_t)(x) & (uint64_t)0x00000000000000ffULL) << 56) | \ - (((uint64_t)(x) & (uint64_t)0x000000000000ff00ULL) << 40) | \ - (((uint64_t)(x) & (uint64_t)0x0000000000ff0000ULL) << 24) | \ - (((uint64_t)(x) & (uint64_t)0x00000000ff000000ULL) << 8) | \ - (((uint64_t)(x) & (uint64_t)0x000000ff00000000ULL) >> 8) | \ - (((uint64_t)(x) & (uint64_t)0x0000ff0000000000ULL) >> 24) | \ - (((uint64_t)(x) & (uint64_t)0x00ff000000000000ULL) >> 40) | \ - (((uint64_t)(x) & (uint64_t)0xff00000000000000ULL) >> 56))) - -#if defined (__FLASHROM_BIG_ENDIAN__) - -#define cpu_to_le(bits) \ -static inline uint##bits##_t cpu_to_le##bits(uint##bits##_t val) \ -{ \ - return ___constant_swab##bits(val); \ +/* swap bytes */ +static inline uint8_t swap8(const uint8_t value) +{ + return (value & (uint8_t)0xffU); } -cpu_to_le(8) -cpu_to_le(16) -cpu_to_le(32) -cpu_to_le(64) - -#define cpu_to_be8 -#define cpu_to_be16 -#define cpu_to_be32 -#define cpu_to_be64 - -#elif defined (__FLASHROM_LITTLE_ENDIAN__) - -#define cpu_to_be(bits) \ -static inline uint##bits##_t cpu_to_be##bits(uint##bits##_t val) \ -{ \ - return ___constant_swab##bits(val); \ +static inline uint16_t swap16(const uint16_t value) +{ + return ((value & (uint16_t)0x00ffU) << 8) | + ((value & (uint16_t)0xff00U) >> 8); } -cpu_to_be(8) -cpu_to_be(16) -cpu_to_be(32) -cpu_to_be(64) +static inline uint32_t swap32(const uint32_t value) +{ + return ((value & (uint32_t)0x000000ffUL) << 24) | + ((value & (uint32_t)0x0000ff00UL) << 8) | + ((value & (uint32_t)0x00ff0000UL) >> 8) | + ((value & (uint32_t)0xff000000UL) >> 24); +} -#define cpu_to_le8 -#define cpu_to_le16 -#define cpu_to_le32 -#define cpu_to_le64 +static inline uint64_t swap64(const uint64_t value) +{ + return ((value & (uint64_t)0x00000000000000ffULL) << 56) | + ((value & (uint64_t)0x000000000000ff00ULL) << 40) | + ((value & (uint64_t)0x0000000000ff0000ULL) << 24) | + ((value & (uint64_t)0x00000000ff000000ULL) << 8) | + ((value & (uint64_t)0x000000ff00000000ULL) >> 8) | + ((value & (uint64_t)0x0000ff0000000000ULL) >> 24) | + ((value & (uint64_t)0x00ff000000000000ULL) >> 40) | + ((value & (uint64_t)0xff00000000000000ULL) >> 56); +} -#endif /* __FLASHROM_BIG_ENDIAN__ / __FLASHROM_LITTLE_ENDIAN__ */ +/* + * macro to return the same value as passed. + * + * `___return_same(cpu_to_le, 8)` + * expands to + * `uint8_t cpu_to_le8 (const uint8_t value) { return value; }` + */ +#define ___return_same(name, bits) \ + uint##bits##_t name##bits (const uint##bits##_t value) { return value; } -#define be_to_cpu8 cpu_to_be8 -#define be_to_cpu16 cpu_to_be16 -#define be_to_cpu32 cpu_to_be32 -#define be_to_cpu64 cpu_to_be64 -#define le_to_cpu8 cpu_to_le8 -#define le_to_cpu16 cpu_to_le16 -#define le_to_cpu32 cpu_to_le32 -#define le_to_cpu64 cpu_to_le64 +/* + * macro to return the swapped value as passed. + * + * `___return_swapped(cpu_to_be, 8)` + * expands to + * `uint8_t cpu_to_be8 (const uint8_t value) { return swap8 (value); }` + */ +#define ___return_swapped(name, bits) \ + uint##bits##_t name##bits (const uint##bits##_t value) { return swap##bits (value); } + +/* convert cpu native endian to little endian */ +uint8_t cpu_to_le8 (const uint8_t value); +uint16_t cpu_to_le16(const uint16_t value); +uint32_t cpu_to_le32(const uint32_t value); +uint64_t cpu_to_le64(const uint64_t value); + +/* convert cpu native endian to big endian */ +uint8_t cpu_to_be8 (const uint8_t value); +uint16_t cpu_to_be16(const uint16_t value); +uint32_t cpu_to_be32(const uint32_t value); +uint64_t cpu_to_be64(const uint64_t value); + +/* convert little endian to cpu native endian */ +uint8_t le_to_cpu8 (const uint8_t value); +uint16_t le_to_cpu16(const uint16_t value); +uint32_t le_to_cpu32(const uint32_t value); +uint64_t le_to_cpu64(const uint64_t value); + +/* convert big endian to cpu native endian */ +uint8_t be_to_cpu8 (const uint8_t value); +uint16_t be_to_cpu16(const uint16_t value); +uint32_t be_to_cpu32(const uint32_t value); +uint64_t be_to_cpu64(const uint64_t value); #endif /* !__HWACCESS_H__ */ |