/* SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause *//* * Copyright (c) Meta Platforms, Inc. and affiliates. * 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 <linux/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******************************************/#undef MEM_STATIC /* may be already defined from common/compiler.h */#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 */