1 /* SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause */
3 * Copyright (c) Meta Platforms, Inc. and affiliates.
6 * This source code is licensed under both the BSD-style license (found in the
7 * LICENSE file in the root directory of this source tree) and the GPLv2 (found
8 * in the COPYING file in the root directory of this source tree).
9 * You may select, at your option, one of the above-listed licenses.
15 /*-****************************************
17 ******************************************/
18 #include <asm/unaligned.h> /* get_unaligned, put_unaligned* */
19 #include <linux/compiler.h> /* inline */
20 #include <linux/swab.h> /* swab32, swab64 */
21 #include <linux/types.h> /* size_t, ptrdiff_t */
22 #include "debug.h" /* DEBUG_STATIC_ASSERT */
24 /*-****************************************
26 ******************************************/
27 #define MEM_STATIC static inline
29 /*-**************************************************************
31 *****************************************************************/
42 /*-**************************************************************
44 *****************************************************************/
45 /*=== Static platform detection ===*/
46 MEM_STATIC unsigned MEM_32bits(void);
47 MEM_STATIC unsigned MEM_64bits(void);
48 MEM_STATIC unsigned MEM_isLittleEndian(void);
50 /*=== Native unaligned read/write ===*/
51 MEM_STATIC U16 MEM_read16(const void* memPtr);
52 MEM_STATIC U32 MEM_read32(const void* memPtr);
53 MEM_STATIC U64 MEM_read64(const void* memPtr);
54 MEM_STATIC size_t MEM_readST(const void* memPtr);
56 MEM_STATIC void MEM_write16(void* memPtr, U16 value);
57 MEM_STATIC void MEM_write32(void* memPtr, U32 value);
58 MEM_STATIC void MEM_write64(void* memPtr, U64 value);
60 /*=== Little endian unaligned read/write ===*/
61 MEM_STATIC U16 MEM_readLE16(const void* memPtr);
62 MEM_STATIC U32 MEM_readLE24(const void* memPtr);
63 MEM_STATIC U32 MEM_readLE32(const void* memPtr);
64 MEM_STATIC U64 MEM_readLE64(const void* memPtr);
65 MEM_STATIC size_t MEM_readLEST(const void* memPtr);
67 MEM_STATIC void MEM_writeLE16(void* memPtr, U16 val);
68 MEM_STATIC void MEM_writeLE24(void* memPtr, U32 val);
69 MEM_STATIC void MEM_writeLE32(void* memPtr, U32 val32);
70 MEM_STATIC void MEM_writeLE64(void* memPtr, U64 val64);
71 MEM_STATIC void MEM_writeLEST(void* memPtr, size_t val);
73 /*=== Big endian unaligned read/write ===*/
74 MEM_STATIC U32 MEM_readBE32(const void* memPtr);
75 MEM_STATIC U64 MEM_readBE64(const void* memPtr);
76 MEM_STATIC size_t MEM_readBEST(const void* memPtr);
78 MEM_STATIC void MEM_writeBE32(void* memPtr, U32 val32);
79 MEM_STATIC void MEM_writeBE64(void* memPtr, U64 val64);
80 MEM_STATIC void MEM_writeBEST(void* memPtr, size_t val);
83 MEM_STATIC U32 MEM_swap32(U32 in);
84 MEM_STATIC U64 MEM_swap64(U64 in);
85 MEM_STATIC size_t MEM_swapST(size_t in);
87 /*-**************************************************************
88 * Memory I/O Implementation
89 *****************************************************************/
90 MEM_STATIC unsigned MEM_32bits(void)
92 return sizeof(size_t) == 4;
95 MEM_STATIC unsigned MEM_64bits(void)
97 return sizeof(size_t) == 8;
100 #if defined(__LITTLE_ENDIAN)
101 #define MEM_LITTLE_ENDIAN 1
103 #define MEM_LITTLE_ENDIAN 0
106 MEM_STATIC unsigned MEM_isLittleEndian(void)
108 return MEM_LITTLE_ENDIAN;
111 MEM_STATIC U16 MEM_read16(const void *memPtr)
113 return get_unaligned((const U16 *)memPtr);
116 MEM_STATIC U32 MEM_read32(const void *memPtr)
118 return get_unaligned((const U32 *)memPtr);
121 MEM_STATIC U64 MEM_read64(const void *memPtr)
123 return get_unaligned((const U64 *)memPtr);
126 MEM_STATIC size_t MEM_readST(const void *memPtr)
128 return get_unaligned((const size_t *)memPtr);
131 MEM_STATIC void MEM_write16(void *memPtr, U16 value)
133 put_unaligned(value, (U16 *)memPtr);
136 MEM_STATIC void MEM_write32(void *memPtr, U32 value)
138 put_unaligned(value, (U32 *)memPtr);
141 MEM_STATIC void MEM_write64(void *memPtr, U64 value)
143 put_unaligned(value, (U64 *)memPtr);
146 /*=== Little endian r/w ===*/
148 MEM_STATIC U16 MEM_readLE16(const void *memPtr)
150 return get_unaligned_le16(memPtr);
153 MEM_STATIC void MEM_writeLE16(void *memPtr, U16 val)
155 put_unaligned_le16(val, memPtr);
158 MEM_STATIC U32 MEM_readLE24(const void *memPtr)
160 return MEM_readLE16(memPtr) + (((const BYTE *)memPtr)[2] << 16);
163 MEM_STATIC void MEM_writeLE24(void *memPtr, U32 val)
165 MEM_writeLE16(memPtr, (U16)val);
166 ((BYTE *)memPtr)[2] = (BYTE)(val >> 16);
169 MEM_STATIC U32 MEM_readLE32(const void *memPtr)
171 return get_unaligned_le32(memPtr);
174 MEM_STATIC void MEM_writeLE32(void *memPtr, U32 val32)
176 put_unaligned_le32(val32, memPtr);
179 MEM_STATIC U64 MEM_readLE64(const void *memPtr)
181 return get_unaligned_le64(memPtr);
184 MEM_STATIC void MEM_writeLE64(void *memPtr, U64 val64)
186 put_unaligned_le64(val64, memPtr);
189 MEM_STATIC size_t MEM_readLEST(const void *memPtr)
192 return (size_t)MEM_readLE32(memPtr);
194 return (size_t)MEM_readLE64(memPtr);
197 MEM_STATIC void MEM_writeLEST(void *memPtr, size_t val)
200 MEM_writeLE32(memPtr, (U32)val);
202 MEM_writeLE64(memPtr, (U64)val);
205 /*=== Big endian r/w ===*/
207 MEM_STATIC U32 MEM_readBE32(const void *memPtr)
209 return get_unaligned_be32(memPtr);
212 MEM_STATIC void MEM_writeBE32(void *memPtr, U32 val32)
214 put_unaligned_be32(val32, memPtr);
217 MEM_STATIC U64 MEM_readBE64(const void *memPtr)
219 return get_unaligned_be64(memPtr);
222 MEM_STATIC void MEM_writeBE64(void *memPtr, U64 val64)
224 put_unaligned_be64(val64, memPtr);
227 MEM_STATIC size_t MEM_readBEST(const void *memPtr)
230 return (size_t)MEM_readBE32(memPtr);
232 return (size_t)MEM_readBE64(memPtr);
235 MEM_STATIC void MEM_writeBEST(void *memPtr, size_t val)
238 MEM_writeBE32(memPtr, (U32)val);
240 MEM_writeBE64(memPtr, (U64)val);
243 MEM_STATIC U32 MEM_swap32(U32 in)
248 MEM_STATIC U64 MEM_swap64(U64 in)
253 MEM_STATIC size_t MEM_swapST(size_t in)
256 return (size_t)MEM_swap32((U32)in);
258 return (size_t)MEM_swap64((U64)in);
261 #endif /* MEM_H_MODULE */