/* SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause */ /* * Copyright (c) Yann Collet, Facebook, Inc. * All rights reserved. * * This source code is licensed under both the BSD-style license (found in the * LICENSE file in the root directory of this source tree) and the GPLv2 (found * in the COPYING file in the root directory of this source tree). * You may select, at your option, one of the above-listed licenses. */ #ifndef MEM_H_MODULE #define MEM_H_MODULE /*-**************************************** * Dependencies ******************************************/ #include <asm/unaligned.h> /* get_unaligned, put_unaligned* */ #include <linux/compiler.h> /* inline */ #include <linux/swab.h> /* swab32, swab64 */ #include <linux/types.h> /* size_t, ptrdiff_t */ #include "debug.h" /* DEBUG_STATIC_ASSERT */ /*-**************************************** * Compiler specifics ******************************************/ #define MEM_STATIC static inline /*-************************************************************** * Basic Types *****************************************************************/ typedef uint8_t BYTE; typedef uint8_t U8; typedef int8_t S8; typedef uint16_t U16; typedef int16_t S16; typedef uint32_t U32; typedef int32_t S32; typedef uint64_t U64; typedef int64_t S64; /*-************************************************************** * Memory I/O API *****************************************************************/ /*=== Static platform detection ===*/ MEM_STATIC unsigned MEM_32bits(void); MEM_STATIC unsigned MEM_64bits(void); MEM_STATIC unsigned MEM_isLittleEndian(void); /*=== Native unaligned read/write ===*/ MEM_STATIC U16 MEM_read16(const void* memPtr); MEM_STATIC U32 MEM_read32(const void* memPtr); MEM_STATIC U64 MEM_read64(const void* memPtr); MEM_STATIC size_t MEM_readST(const void* memPtr); MEM_STATIC void MEM_write16(void* memPtr, U16 value); MEM_STATIC void MEM_write32(void* memPtr, U32 value); MEM_STATIC void MEM_write64(void* memPtr, U64 value); /*=== Little endian unaligned read/write ===*/ MEM_STATIC U16 MEM_readLE16(const void* memPtr); MEM_STATIC U32 MEM_readLE24(const void* memPtr); MEM_STATIC U32 MEM_readLE32(const void* memPtr); MEM_STATIC U64 MEM_readLE64(const void* memPtr); MEM_STATIC size_t MEM_readLEST(const void* memPtr); MEM_STATIC void MEM_writeLE16(void* memPtr, U16 val); MEM_STATIC void MEM_writeLE24(void* memPtr, U32 val); MEM_STATIC void MEM_writeLE32(void* memPtr, U32 val32); MEM_STATIC void MEM_writeLE64(void* memPtr, U64 val64); MEM_STATIC void MEM_writeLEST(void* memPtr, size_t val); /*=== Big endian unaligned read/write ===*/ MEM_STATIC U32 MEM_readBE32(const void* memPtr); MEM_STATIC U64 MEM_readBE64(const void* memPtr); MEM_STATIC size_t MEM_readBEST(const void* memPtr); MEM_STATIC void MEM_writeBE32(void* memPtr, U32 val32); MEM_STATIC void MEM_writeBE64(void* memPtr, U64 val64); MEM_STATIC void MEM_writeBEST(void* memPtr, size_t val); /*=== Byteswap ===*/ MEM_STATIC U32 MEM_swap32(U32 in); MEM_STATIC U64 MEM_swap64(U64 in); MEM_STATIC size_t MEM_swapST(size_t in); /*-************************************************************** * Memory I/O Implementation *****************************************************************/ MEM_STATIC unsigned MEM_32bits(void) { return sizeof(size_t) == 4; } MEM_STATIC unsigned MEM_64bits(void) { return sizeof(size_t) == 8; } #if defined(__LITTLE_ENDIAN) #define MEM_LITTLE_ENDIAN 1 #else #define MEM_LITTLE_ENDIAN 0 #endif MEM_STATIC unsigned MEM_isLittleEndian(void) { return MEM_LITTLE_ENDIAN; } MEM_STATIC U16 MEM_read16(const void *memPtr) { return get_unaligned((const U16 *)memPtr); } MEM_STATIC U32 MEM_read32(const void *memPtr) { return get_unaligned((const U32 *)memPtr); } MEM_STATIC U64 MEM_read64(const void *memPtr) { return get_unaligned((const U64 *)memPtr); } MEM_STATIC size_t MEM_readST(const void *memPtr) { return get_unaligned((const size_t *)memPtr); } MEM_STATIC void MEM_write16(void *memPtr, U16 value) { put_unaligned(value, (U16 *)memPtr); } MEM_STATIC void MEM_write32(void *memPtr, U32 value) { put_unaligned(value, (U32 *)memPtr); } MEM_STATIC void MEM_write64(void *memPtr, U64 value) { put_unaligned(value, (U64 *)memPtr); } /*=== Little endian r/w ===*/ MEM_STATIC U16 MEM_readLE16(const void *memPtr) { return get_unaligned_le16(memPtr); } MEM_STATIC void MEM_writeLE16(void *memPtr, U16 val) { put_unaligned_le16(val, memPtr); } MEM_STATIC U32 MEM_readLE24(const void *memPtr) { return MEM_readLE16(memPtr) + (((const BYTE *)memPtr)[2] << 16); } MEM_STATIC void MEM_writeLE24(void *memPtr, U32 val) { MEM_writeLE16(memPtr, (U16)val); ((BYTE *)memPtr)[2] = (BYTE)(val >> 16); } MEM_STATIC U32 MEM_readLE32(const void *memPtr) { return get_unaligned_le32(memPtr); } MEM_STATIC void MEM_writeLE32(void *memPtr, U32 val32) { put_unaligned_le32(val32, memPtr); } MEM_STATIC U64 MEM_readLE64(const void *memPtr) { return get_unaligned_le64(memPtr); } MEM_STATIC void MEM_writeLE64(void *memPtr, U64 val64) { put_unaligned_le64(val64, memPtr); } MEM_STATIC size_t MEM_readLEST(const void *memPtr) { if (MEM_32bits()) return (size_t)MEM_readLE32(memPtr); else return (size_t)MEM_readLE64(memPtr); } MEM_STATIC void MEM_writeLEST(void *memPtr, size_t val) { if (MEM_32bits()) MEM_writeLE32(memPtr, (U32)val); else MEM_writeLE64(memPtr, (U64)val); } /*=== Big endian r/w ===*/ MEM_STATIC U32 MEM_readBE32(const void *memPtr) { return get_unaligned_be32(memPtr); } MEM_STATIC void MEM_writeBE32(void *memPtr, U32 val32) { put_unaligned_be32(val32, memPtr); } MEM_STATIC U64 MEM_readBE64(const void *memPtr) { return get_unaligned_be64(memPtr); } MEM_STATIC void MEM_writeBE64(void *memPtr, U64 val64) { put_unaligned_be64(val64, memPtr); } MEM_STATIC size_t MEM_readBEST(const void *memPtr) { if (MEM_32bits()) return (size_t)MEM_readBE32(memPtr); else return (size_t)MEM_readBE64(memPtr); } MEM_STATIC void MEM_writeBEST(void *memPtr, size_t val) { if (MEM_32bits()) MEM_writeBE32(memPtr, (U32)val); else MEM_writeBE64(memPtr, (U64)val); } MEM_STATIC U32 MEM_swap32(U32 in) { return swab32(in); } MEM_STATIC U64 MEM_swap64(U64 in) { return swab64(in); } MEM_STATIC size_t MEM_swapST(size_t in) { if (MEM_32bits()) return (size_t)MEM_swap32((U32)in); else return (size_t)MEM_swap64((U64)in); } #endif /* MEM_H_MODULE */