| | 1 | /** @file\r |
| | 2 | Unaligned access functions of BaseLib.\r |
| | 3 | \r |
| | 4 | Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>\r |
| | 5 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
| | 6 | \r |
| | 7 | **/\r |
| | 8 | \r |
| | 9 | #include "BaseLibInternals.h"\r |
| | 10 | \r |
| | 11 | /**\r |
| | 12 | Reads a 16-bit value from memory that may be unaligned.\r |
| | 13 | \r |
| | 14 | This function returns the 16-bit value pointed to by Buffer. The function\r |
| | 15 | guarantees that the read operation does not produce an alignment fault.\r |
| | 16 | \r |
| | 17 | If the Buffer is NULL, then ASSERT().\r |
| | 18 | \r |
| | 19 | @param Buffer A pointer to a 16-bit value that may be unaligned.\r |
| | 20 | \r |
| | 21 | @return The 16-bit value read from Buffer.\r |
| | 22 | \r |
| | 23 | **/\r |
| | 24 | UINT16\r |
| | 25 | EFIAPI\r |
| | 26 | ReadUnaligned16 (\r |
| | 27 | IN CONST UINT16 *Buffer\r |
| | 28 | )\r |
| | 29 | {\r |
| | 30 | ASSERT (Buffer != NULL);\r |
| | 31 | \r |
| | 32 | return *Buffer;\r |
| | 33 | }\r |
| | 34 | \r |
| | 35 | /**\r |
| | 36 | Writes a 16-bit value to memory that may be unaligned.\r |
| | 37 | \r |
| | 38 | This function writes the 16-bit value specified by Value to Buffer. Value is\r |
| | 39 | returned. The function guarantees that the write operation does not produce\r |
| | 40 | an alignment fault.\r |
| | 41 | \r |
| | 42 | If the Buffer is NULL, then ASSERT().\r |
| | 43 | \r |
| | 44 | @param Buffer A pointer to a 16-bit value that may be unaligned.\r |
| | 45 | @param Value 16-bit value to write to Buffer.\r |
| | 46 | \r |
| | 47 | @return The 16-bit value to write to Buffer.\r |
| | 48 | \r |
| | 49 | **/\r |
| | 50 | UINT16\r |
| | 51 | EFIAPI\r |
| | 52 | WriteUnaligned16 (\r |
| | 53 | OUT UINT16 *Buffer,\r |
| | 54 | IN UINT16 Value\r |
| | 55 | )\r |
| | 56 | {\r |
| | 57 | ASSERT (Buffer != NULL);\r |
| | 58 | \r |
| | 59 | return *Buffer = Value;\r |
| | 60 | }\r |
| | 61 | \r |
| | 62 | /**\r |
| | 63 | Reads a 24-bit value from memory that may be unaligned.\r |
| | 64 | \r |
| | 65 | This function returns the 24-bit value pointed to by Buffer. The function\r |
| | 66 | guarantees that the read operation does not produce an alignment fault.\r |
| | 67 | \r |
| | 68 | If the Buffer is NULL, then ASSERT().\r |
| | 69 | \r |
| | 70 | @param Buffer A pointer to a 24-bit value that may be unaligned.\r |
| | 71 | \r |
| | 72 | @return The 24-bit value read from Buffer.\r |
| | 73 | \r |
| | 74 | **/\r |
| | 75 | UINT32\r |
| | 76 | EFIAPI\r |
| | 77 | ReadUnaligned24 (\r |
| | 78 | IN CONST UINT32 *Buffer\r |
| | 79 | )\r |
| | 80 | {\r |
| | 81 | ASSERT (Buffer != NULL);\r |
| | 82 | \r |
| | 83 | return *Buffer & 0xffffff;\r |
| | 84 | }\r |
| | 85 | \r |
| | 86 | /**\r |
| | 87 | Writes a 24-bit value to memory that may be unaligned.\r |
| | 88 | \r |
| | 89 | This function writes the 24-bit value specified by Value to Buffer. Value is\r |
| | 90 | returned. The function guarantees that the write operation does not produce\r |
| | 91 | an alignment fault.\r |
| | 92 | \r |
| | 93 | If the Buffer is NULL, then ASSERT().\r |
| | 94 | \r |
| | 95 | @param Buffer A pointer to a 24-bit value that may be unaligned.\r |
| | 96 | @param Value 24-bit value to write to Buffer.\r |
| | 97 | \r |
| | 98 | @return The 24-bit value to write to Buffer.\r |
| | 99 | \r |
| | 100 | **/\r |
| | 101 | UINT32\r |
| | 102 | EFIAPI\r |
| | 103 | WriteUnaligned24 (\r |
| | 104 | OUT UINT32 *Buffer,\r |
| | 105 | IN UINT32 Value\r |
| | 106 | )\r |
| | 107 | {\r |
| | 108 | ASSERT (Buffer != NULL);\r |
| | 109 | \r |
| | 110 | *Buffer = BitFieldWrite32 (*Buffer, 0, 23, Value);\r |
| | 111 | return Value;\r |
| | 112 | }\r |
| | 113 | \r |
| | 114 | /**\r |
| | 115 | Reads a 32-bit value from memory that may be unaligned.\r |
| | 116 | \r |
| | 117 | This function returns the 32-bit value pointed to by Buffer. The function\r |
| | 118 | guarantees that the read operation does not produce an alignment fault.\r |
| | 119 | \r |
| | 120 | If the Buffer is NULL, then ASSERT().\r |
| | 121 | \r |
| | 122 | @param Buffer A pointer to a 32-bit value that may be unaligned.\r |
| | 123 | \r |
| | 124 | @return The 32-bit value read from Buffer.\r |
| | 125 | \r |
| | 126 | **/\r |
| | 127 | UINT32\r |
| | 128 | EFIAPI\r |
| | 129 | ReadUnaligned32 (\r |
| | 130 | IN CONST UINT32 *Buffer\r |
| | 131 | )\r |
| | 132 | {\r |
| | 133 | ASSERT (Buffer != NULL);\r |
| | 134 | \r |
| | 135 | return *Buffer;\r |
| | 136 | }\r |
| | 137 | \r |
| | 138 | /**\r |
| | 139 | Writes a 32-bit value to memory that may be unaligned.\r |
| | 140 | \r |
| | 141 | This function writes the 32-bit value specified by Value to Buffer. Value is\r |
| | 142 | returned. The function guarantees that the write operation does not produce\r |
| | 143 | an alignment fault.\r |
| | 144 | \r |
| | 145 | If the Buffer is NULL, then ASSERT().\r |
| | 146 | \r |
| | 147 | @param Buffer A pointer to a 32-bit value that may be unaligned.\r |
| | 148 | @param Value The 32-bit value to write to Buffer.\r |
| | 149 | \r |
| | 150 | @return The 32-bit value to write to Buffer.\r |
| | 151 | \r |
| | 152 | **/\r |
| | 153 | UINT32\r |
| | 154 | EFIAPI\r |
| | 155 | WriteUnaligned32 (\r |
| | 156 | OUT UINT32 *Buffer,\r |
| | 157 | IN UINT32 Value\r |
| | 158 | )\r |
| | 159 | {\r |
| | 160 | ASSERT (Buffer != NULL);\r |
| | 161 | \r |
| | 162 | return *Buffer = Value;\r |
| | 163 | }\r |
| | 164 | \r |
| | 165 | /**\r |
| | 166 | Reads a 64-bit value from memory that may be unaligned.\r |
| | 167 | \r |
| | 168 | This function returns the 64-bit value pointed to by Buffer. The function\r |
| | 169 | guarantees that the read operation does not produce an alignment fault.\r |
| | 170 | \r |
| | 171 | If the Buffer is NULL, then ASSERT().\r |
| | 172 | \r |
| | 173 | @param Buffer A pointer to a 64-bit value that may be unaligned.\r |
| | 174 | \r |
| | 175 | @return The 64-bit value read from Buffer.\r |
| | 176 | \r |
| | 177 | **/\r |
| | 178 | UINT64\r |
| | 179 | EFIAPI\r |
| | 180 | ReadUnaligned64 (\r |
| | 181 | IN CONST UINT64 *Buffer\r |
| | 182 | )\r |
| | 183 | {\r |
| | 184 | ASSERT (Buffer != NULL);\r |
| | 185 | \r |
| | 186 | return *Buffer;\r |
| | 187 | }\r |
| | 188 | \r |
| | 189 | /**\r |
| | 190 | Writes a 64-bit value to memory that may be unaligned.\r |
| | 191 | \r |
| | 192 | This function writes the 64-bit value specified by Value to Buffer. Value is\r |
| | 193 | returned. The function guarantees that the write operation does not produce\r |
| | 194 | an alignment fault.\r |
| | 195 | \r |
| | 196 | If the Buffer is NULL, then ASSERT().\r |
| | 197 | \r |
| | 198 | @param Buffer A pointer to a 64-bit value that may be unaligned.\r |
| | 199 | @param Value The 64-bit value to write to Buffer.\r |
| | 200 | \r |
| | 201 | @return The 64-bit value to write to Buffer.\r |
| | 202 | \r |
| | 203 | **/\r |
| | 204 | UINT64\r |
| | 205 | EFIAPI\r |
| | 206 | WriteUnaligned64 (\r |
| | 207 | OUT UINT64 *Buffer,\r |
| | 208 | IN UINT64 Value\r |
| | 209 | )\r |
| | 210 | {\r |
| | 211 | ASSERT (Buffer != NULL);\r |
| | 212 | \r |
| | 213 | return *Buffer = Value;\r |
| | 214 | }\r |
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