| | 1 | /** @file\r |
| | 2 | Bit field functions of BaseLib.\r |
| | 3 | \r |
| | 4 | Copyright (c) 2006 - 2018, 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 | Worker function that returns a bit field from Operand.\r |
| | 13 | \r |
| | 14 | Returns the bitfield specified by the StartBit and the EndBit from Operand.\r |
| | 15 | \r |
| | 16 | @param Operand Operand on which to perform the bitfield operation.\r |
| | 17 | @param StartBit The ordinal of the least significant bit in the bit field.\r |
| | 18 | @param EndBit The ordinal of the most significant bit in the bit field.\r |
| | 19 | \r |
| | 20 | @return The bit field read.\r |
| | 21 | \r |
| | 22 | **/\r |
| | 23 | UINTN\r |
| | 24 | EFIAPI\r |
| | 25 | InternalBaseLibBitFieldReadUint (\r |
| | 26 | IN UINTN Operand,\r |
| | 27 | IN UINTN StartBit,\r |
| | 28 | IN UINTN EndBit\r |
| | 29 | )\r |
| | 30 | {\r |
| | 31 | //\r |
| | 32 | // ~((UINTN)-2 << EndBit) is a mask in which bit[0] thru bit[EndBit]\r |
| | 33 | // are 1's while bit[EndBit + 1] thru the most significant bit are 0's.\r |
| | 34 | //\r |
| | 35 | return (Operand & ~((UINTN)-2 << EndBit)) >> StartBit;\r |
| | 36 | }\r |
| | 37 | \r |
| | 38 | /**\r |
| | 39 | Worker function that reads a bit field from Operand, performs a bitwise OR,\r |
| | 40 | and returns the result.\r |
| | 41 | \r |
| | 42 | Performs a bitwise OR between the bit field specified by StartBit and EndBit\r |
| | 43 | in Operand and the value specified by AndData. All other bits in Operand are\r |
| | 44 | preserved. The new value is returned.\r |
| | 45 | \r |
| | 46 | If OrData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().\r |
| | 47 | \r |
| | 48 | @param Operand Operand on which to perform the bitfield operation.\r |
| | 49 | @param StartBit The ordinal of the least significant bit in the bit field.\r |
| | 50 | @param EndBit The ordinal of the most significant bit in the bit field.\r |
| | 51 | @param OrData The value to OR with the read value from the value.\r |
| | 52 | \r |
| | 53 | @return The new value.\r |
| | 54 | \r |
| | 55 | **/\r |
| | 56 | UINTN\r |
| | 57 | EFIAPI\r |
| | 58 | InternalBaseLibBitFieldOrUint (\r |
| | 59 | IN UINTN Operand,\r |
| | 60 | IN UINTN StartBit,\r |
| | 61 | IN UINTN EndBit,\r |
| | 62 | IN UINTN OrData\r |
| | 63 | )\r |
| | 64 | {\r |
| | 65 | //\r |
| | 66 | // Higher bits in OrData those are not used must be zero.\r |
| | 67 | //\r |
| | 68 | // EndBit - StartBit + 1 might be 32 while the result right shifting 32 on a 32bit integer is undefined,\r |
| | 69 | // So the logic is updated to right shift (EndBit - StartBit) bits and compare the last bit directly.\r |
| | 70 | //\r |
| | 71 | ASSERT ((OrData >> (EndBit - StartBit)) == ((OrData >> (EndBit - StartBit)) & 1));\r |
| | 72 | \r |
| | 73 | //\r |
| | 74 | // ~((UINTN)-2 << EndBit) is a mask in which bit[0] thru bit[EndBit]\r |
| | 75 | // are 1's while bit[EndBit + 1] thru the most significant bit are 0's.\r |
| | 76 | //\r |
| | 77 | return Operand | ((OrData << StartBit) & ~((UINTN)-2 << EndBit));\r |
| | 78 | }\r |
| | 79 | \r |
| | 80 | /**\r |
| | 81 | Worker function that reads a bit field from Operand, performs a bitwise AND,\r |
| | 82 | and returns the result.\r |
| | 83 | \r |
| | 84 | Performs a bitwise AND between the bit field specified by StartBit and EndBit\r |
| | 85 | in Operand and the value specified by AndData. All other bits in Operand are\r |
| | 86 | preserved. The new value is returned.\r |
| | 87 | \r |
| | 88 | If AndData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().\r |
| | 89 | \r |
| | 90 | @param Operand Operand on which to perform the bitfield operation.\r |
| | 91 | @param StartBit The ordinal of the least significant bit in the bit field.\r |
| | 92 | @param EndBit The ordinal of the most significant bit in the bit field.\r |
| | 93 | @param AndData The value to And with the read value from the value.\r |
| | 94 | \r |
| | 95 | @return The new value.\r |
| | 96 | \r |
| | 97 | **/\r |
| | 98 | UINTN\r |
| | 99 | EFIAPI\r |
| | 100 | InternalBaseLibBitFieldAndUint (\r |
| | 101 | IN UINTN Operand,\r |
| | 102 | IN UINTN StartBit,\r |
| | 103 | IN UINTN EndBit,\r |
| | 104 | IN UINTN AndData\r |
| | 105 | )\r |
| | 106 | {\r |
| | 107 | //\r |
| | 108 | // Higher bits in AndData those are not used must be zero.\r |
| | 109 | //\r |
| | 110 | // EndBit - StartBit + 1 might be 32 while the result right shifting 32 on a 32bit integer is undefined,\r |
| | 111 | // So the logic is updated to right shift (EndBit - StartBit) bits and compare the last bit directly.\r |
| | 112 | //\r |
| | 113 | ASSERT ((AndData >> (EndBit - StartBit)) == ((AndData >> (EndBit - StartBit)) & 1));\r |
| | 114 | \r |
| | 115 | //\r |
| | 116 | // ~((UINTN)-2 << EndBit) is a mask in which bit[0] thru bit[EndBit]\r |
| | 117 | // are 1's while bit[EndBit + 1] thru the most significant bit are 0's.\r |
| | 118 | //\r |
| | 119 | return Operand & ~((~AndData << StartBit) & ~((UINTN)-2 << EndBit));\r |
| | 120 | }\r |
| | 121 | \r |
| | 122 | /**\r |
| | 123 | Returns a bit field from an 8-bit value.\r |
| | 124 | \r |
| | 125 | Returns the bitfield specified by the StartBit and the EndBit from Operand.\r |
| | 126 | \r |
| | 127 | If 8-bit operations are not supported, then ASSERT().\r |
| | 128 | If StartBit is greater than 7, then ASSERT().\r |
| | 129 | If EndBit is greater than 7, then ASSERT().\r |
| | 130 | If EndBit is less than StartBit, then ASSERT().\r |
| | 131 | \r |
| | 132 | @param Operand Operand on which to perform the bitfield operation.\r |
| | 133 | @param StartBit The ordinal of the least significant bit in the bit field.\r |
| | 134 | Range 0..7.\r |
| | 135 | @param EndBit The ordinal of the most significant bit in the bit field.\r |
| | 136 | Range 0..7.\r |
| | 137 | \r |
| | 138 | @return The bit field read.\r |
| | 139 | \r |
| | 140 | **/\r |
| | 141 | UINT8\r |
| | 142 | EFIAPI\r |
| | 143 | BitFieldRead8 (\r |
| | 144 | IN UINT8 Operand,\r |
| | 145 | IN UINTN StartBit,\r |
| | 146 | IN UINTN EndBit\r |
| | 147 | )\r |
| | 148 | {\r |
| | 149 | ASSERT (EndBit < 8);\r |
| | 150 | ASSERT (StartBit <= EndBit);\r |
| | 151 | return (UINT8)InternalBaseLibBitFieldReadUint (Operand, StartBit, EndBit);\r |
| | 152 | }\r |
| | 153 | \r |
| | 154 | /**\r |
| | 155 | Writes a bit field to an 8-bit value, and returns the result.\r |
| | 156 | \r |
| | 157 | Writes Value to the bit field specified by the StartBit and the EndBit in\r |
| | 158 | Operand. All other bits in Operand are preserved. The new 8-bit value is\r |
| | 159 | returned.\r |
| | 160 | \r |
| | 161 | If 8-bit operations are not supported, then ASSERT().\r |
| | 162 | If StartBit is greater than 7, then ASSERT().\r |
| | 163 | If EndBit is greater than 7, then ASSERT().\r |
| | 164 | If EndBit is less than StartBit, then ASSERT().\r |
| | 165 | If Value is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().\r |
| | 166 | \r |
| | 167 | @param Operand Operand on which to perform the bitfield operation.\r |
| | 168 | @param StartBit The ordinal of the least significant bit in the bit field.\r |
| | 169 | Range 0..7.\r |
| | 170 | @param EndBit The ordinal of the most significant bit in the bit field.\r |
| | 171 | Range 0..7.\r |
| | 172 | @param Value The new value of the bit field.\r |
| | 173 | \r |
| | 174 | @return The new 8-bit value.\r |
| | 175 | \r |
| | 176 | **/\r |
| | 177 | UINT8\r |
| | 178 | EFIAPI\r |
| | 179 | BitFieldWrite8 (\r |
| | 180 | IN UINT8 Operand,\r |
| | 181 | IN UINTN StartBit,\r |
| | 182 | IN UINTN EndBit,\r |
| | 183 | IN UINT8 Value\r |
| | 184 | )\r |
| | 185 | {\r |
| | 186 | ASSERT (EndBit < 8);\r |
| | 187 | ASSERT (StartBit <= EndBit);\r |
| | 188 | return BitFieldAndThenOr8 (Operand, StartBit, EndBit, 0, Value);\r |
| | 189 | }\r |
| | 190 | \r |
| | 191 | /**\r |
| | 192 | Reads a bit field from an 8-bit value, performs a bitwise OR, and returns the\r |
| | 193 | result.\r |
| | 194 | \r |
| | 195 | Performs a bitwise OR between the bit field specified by StartBit\r |
| | 196 | and EndBit in Operand and the value specified by OrData. All other bits in\r |
| | 197 | Operand are preserved. The new 8-bit value is returned.\r |
| | 198 | \r |
| | 199 | If 8-bit operations are not supported, then ASSERT().\r |
| | 200 | If StartBit is greater than 7, then ASSERT().\r |
| | 201 | If EndBit is greater than 7, then ASSERT().\r |
| | 202 | If EndBit is less than StartBit, then ASSERT().\r |
| | 203 | If OrData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().\r |
| | 204 | \r |
| | 205 | @param Operand Operand on which to perform the bitfield operation.\r |
| | 206 | @param StartBit The ordinal of the least significant bit in the bit field.\r |
| | 207 | Range 0..7.\r |
| | 208 | @param EndBit The ordinal of the most significant bit in the bit field.\r |
| | 209 | Range 0..7.\r |
| | 210 | @param OrData The value to OR with the read value from the value.\r |
| | 211 | \r |
| | 212 | @return The new 8-bit value.\r |
| | 213 | \r |
| | 214 | **/\r |
| | 215 | UINT8\r |
| | 216 | EFIAPI\r |
| | 217 | BitFieldOr8 (\r |
| | 218 | IN UINT8 Operand,\r |
| | 219 | IN UINTN StartBit,\r |
| | 220 | IN UINTN EndBit,\r |
| | 221 | IN UINT8 OrData\r |
| | 222 | )\r |
| | 223 | {\r |
| | 224 | ASSERT (EndBit < 8);\r |
| | 225 | ASSERT (StartBit <= EndBit);\r |
| | 226 | return (UINT8)InternalBaseLibBitFieldOrUint (Operand, StartBit, EndBit, OrData);\r |
| | 227 | }\r |
| | 228 | \r |
| | 229 | /**\r |
| | 230 | Reads a bit field from an 8-bit value, performs a bitwise AND, and returns\r |
| | 231 | the result.\r |
| | 232 | \r |
| | 233 | Performs a bitwise AND between the bit field specified by StartBit and EndBit\r |
| | 234 | in Operand and the value specified by AndData. All other bits in Operand are\r |
| | 235 | preserved. The new 8-bit value is returned.\r |
| | 236 | \r |
| | 237 | If 8-bit operations are not supported, then ASSERT().\r |
| | 238 | If StartBit is greater than 7, then ASSERT().\r |
| | 239 | If EndBit is greater than 7, then ASSERT().\r |
| | 240 | If EndBit is less than StartBit, then ASSERT().\r |
| | 241 | If AndData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().\r |
| | 242 | \r |
| | 243 | @param Operand Operand on which to perform the bitfield operation.\r |
| | 244 | @param StartBit The ordinal of the least significant bit in the bit field.\r |
| | 245 | Range 0..7.\r |
| | 246 | @param EndBit The ordinal of the most significant bit in the bit field.\r |
| | 247 | Range 0..7.\r |
| | 248 | @param AndData The value to AND with the read value from the value.\r |
| | 249 | \r |
| | 250 | @return The new 8-bit value.\r |
| | 251 | \r |
| | 252 | **/\r |
| | 253 | UINT8\r |
| | 254 | EFIAPI\r |
| | 255 | BitFieldAnd8 (\r |
| | 256 | IN UINT8 Operand,\r |
| | 257 | IN UINTN StartBit,\r |
| | 258 | IN UINTN EndBit,\r |
| | 259 | IN UINT8 AndData\r |
| | 260 | )\r |
| | 261 | {\r |
| | 262 | ASSERT (EndBit < 8);\r |
| | 263 | ASSERT (StartBit <= EndBit);\r |
| | 264 | return (UINT8)InternalBaseLibBitFieldAndUint (Operand, StartBit, EndBit, AndData);\r |
| | 265 | }\r |
| | 266 | \r |
| | 267 | /**\r |
| | 268 | Reads a bit field from an 8-bit value, performs a bitwise AND followed by a\r |
| | 269 | bitwise OR, and returns the result.\r |
| | 270 | \r |
| | 271 | Performs a bitwise AND between the bit field specified by StartBit and EndBit\r |
| | 272 | in Operand and the value specified by AndData, followed by a bitwise\r |
| | 273 | OR with value specified by OrData. All other bits in Operand are\r |
| | 274 | preserved. The new 8-bit value is returned.\r |
| | 275 | \r |
| | 276 | If 8-bit operations are not supported, then ASSERT().\r |
| | 277 | If StartBit is greater than 7, then ASSERT().\r |
| | 278 | If EndBit is greater than 7, then ASSERT().\r |
| | 279 | If EndBit is less than StartBit, then ASSERT().\r |
| | 280 | If AndData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().\r |
| | 281 | If OrData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().\r |
| | 282 | \r |
| | 283 | @param Operand Operand on which to perform the bitfield operation.\r |
| | 284 | @param StartBit The ordinal of the least significant bit in the bit field.\r |
| | 285 | Range 0..7.\r |
| | 286 | @param EndBit The ordinal of the most significant bit in the bit field.\r |
| | 287 | Range 0..7.\r |
| | 288 | @param AndData The value to AND with the read value from the value.\r |
| | 289 | @param OrData The value to OR with the result of the AND operation.\r |
| | 290 | \r |
| | 291 | @return The new 8-bit value.\r |
| | 292 | \r |
| | 293 | **/\r |
| | 294 | UINT8\r |
| | 295 | EFIAPI\r |
| | 296 | BitFieldAndThenOr8 (\r |
| | 297 | IN UINT8 Operand,\r |
| | 298 | IN UINTN StartBit,\r |
| | 299 | IN UINTN EndBit,\r |
| | 300 | IN UINT8 AndData,\r |
| | 301 | IN UINT8 OrData\r |
| | 302 | )\r |
| | 303 | {\r |
| | 304 | ASSERT (EndBit < 8);\r |
| | 305 | ASSERT (StartBit <= EndBit);\r |
| | 306 | return BitFieldOr8 (\r |
| | 307 | BitFieldAnd8 (Operand, StartBit, EndBit, AndData),\r |
| | 308 | StartBit,\r |
| | 309 | EndBit,\r |
| | 310 | OrData\r |
| | 311 | );\r |
| | 312 | }\r |
| | 313 | \r |
| | 314 | /**\r |
| | 315 | Returns a bit field from a 16-bit value.\r |
| | 316 | \r |
| | 317 | Returns the bitfield specified by the StartBit and the EndBit from Operand.\r |
| | 318 | \r |
| | 319 | If 16-bit operations are not supported, then ASSERT().\r |
| | 320 | If StartBit is greater than 15, then ASSERT().\r |
| | 321 | If EndBit is greater than 15, then ASSERT().\r |
| | 322 | If EndBit is less than StartBit, then ASSERT().\r |
| | 323 | \r |
| | 324 | @param Operand Operand on which to perform the bitfield operation.\r |
| | 325 | @param StartBit The ordinal of the least significant bit in the bit field.\r |
| | 326 | Range 0..15.\r |
| | 327 | @param EndBit The ordinal of the most significant bit in the bit field.\r |
| | 328 | Range 0..15.\r |
| | 329 | \r |
| | 330 | @return The bit field read.\r |
| | 331 | \r |
| | 332 | **/\r |
| | 333 | UINT16\r |
| | 334 | EFIAPI\r |
| | 335 | BitFieldRead16 (\r |
| | 336 | IN UINT16 Operand,\r |
| | 337 | IN UINTN StartBit,\r |
| | 338 | IN UINTN EndBit\r |
| | 339 | )\r |
| | 340 | {\r |
| | 341 | ASSERT (EndBit < 16);\r |
| | 342 | ASSERT (StartBit <= EndBit);\r |
| | 343 | return (UINT16)InternalBaseLibBitFieldReadUint (Operand, StartBit, EndBit);\r |
| | 344 | }\r |
| | 345 | \r |
| | 346 | /**\r |
| | 347 | Writes a bit field to a 16-bit value, and returns the result.\r |
| | 348 | \r |
| | 349 | Writes Value to the bit field specified by the StartBit and the EndBit in\r |
| | 350 | Operand. All other bits in Operand are preserved. The new 16-bit value is\r |
| | 351 | returned.\r |
| | 352 | \r |
| | 353 | If 16-bit operations are not supported, then ASSERT().\r |
| | 354 | If StartBit is greater than 15, then ASSERT().\r |
| | 355 | If EndBit is greater than 15, then ASSERT().\r |
| | 356 | If EndBit is less than StartBit, then ASSERT().\r |
| | 357 | If Value is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().\r |
| | 358 | \r |
| | 359 | @param Operand Operand on which to perform the bitfield operation.\r |
| | 360 | @param StartBit The ordinal of the least significant bit in the bit field.\r |
| | 361 | Range 0..15.\r |
| | 362 | @param EndBit The ordinal of the most significant bit in the bit field.\r |
| | 363 | Range 0..15.\r |
| | 364 | @param Value The new value of the bit field.\r |
| | 365 | \r |
| | 366 | @return The new 16-bit value.\r |
| | 367 | \r |
| | 368 | **/\r |
| | 369 | UINT16\r |
| | 370 | EFIAPI\r |
| | 371 | BitFieldWrite16 (\r |
| | 372 | IN UINT16 Operand,\r |
| | 373 | IN UINTN StartBit,\r |
| | 374 | IN UINTN EndBit,\r |
| | 375 | IN UINT16 Value\r |
| | 376 | )\r |
| | 377 | {\r |
| | 378 | ASSERT (EndBit < 16);\r |
| | 379 | ASSERT (StartBit <= EndBit);\r |
| | 380 | return BitFieldAndThenOr16 (Operand, StartBit, EndBit, 0, Value);\r |
| | 381 | }\r |
| | 382 | \r |
| | 383 | /**\r |
| | 384 | Reads a bit field from a 16-bit value, performs a bitwise OR, and returns the\r |
| | 385 | result.\r |
| | 386 | \r |
| | 387 | Performs a bitwise OR between the bit field specified by StartBit\r |
| | 388 | and EndBit in Operand and the value specified by OrData. All other bits in\r |
| | 389 | Operand are preserved. The new 16-bit value is returned.\r |
| | 390 | \r |
| | 391 | If 16-bit operations are not supported, then ASSERT().\r |
| | 392 | If StartBit is greater than 15, then ASSERT().\r |
| | 393 | If EndBit is greater than 15, then ASSERT().\r |
| | 394 | If EndBit is less than StartBit, then ASSERT().\r |
| | 395 | If OrData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().\r |
| | 396 | \r |
| | 397 | @param Operand Operand on which to perform the bitfield operation.\r |
| | 398 | @param StartBit The ordinal of the least significant bit in the bit field.\r |
| | 399 | Range 0..15.\r |
| | 400 | @param EndBit The ordinal of the most significant bit in the bit field.\r |
| | 401 | Range 0..15.\r |
| | 402 | @param OrData The value to OR with the read value from the value.\r |
| | 403 | \r |
| | 404 | @return The new 16-bit value.\r |
| | 405 | \r |
| | 406 | **/\r |
| | 407 | UINT16\r |
| | 408 | EFIAPI\r |
| | 409 | BitFieldOr16 (\r |
| | 410 | IN UINT16 Operand,\r |
| | 411 | IN UINTN StartBit,\r |
| | 412 | IN UINTN EndBit,\r |
| | 413 | IN UINT16 OrData\r |
| | 414 | )\r |
| | 415 | {\r |
| | 416 | ASSERT (EndBit < 16);\r |
| | 417 | ASSERT (StartBit <= EndBit);\r |
| | 418 | return (UINT16)InternalBaseLibBitFieldOrUint (Operand, StartBit, EndBit, OrData);\r |
| | 419 | }\r |
| | 420 | \r |
| | 421 | /**\r |
| | 422 | Reads a bit field from a 16-bit value, performs a bitwise AND, and returns\r |
| | 423 | the result.\r |
| | 424 | \r |
| | 425 | Performs a bitwise AND between the bit field specified by StartBit and EndBit\r |
| | 426 | in Operand and the value specified by AndData. All other bits in Operand are\r |
| | 427 | preserved. The new 16-bit value is returned.\r |
| | 428 | \r |
| | 429 | If 16-bit operations are not supported, then ASSERT().\r |
| | 430 | If StartBit is greater than 15, then ASSERT().\r |
| | 431 | If EndBit is greater than 15, then ASSERT().\r |
| | 432 | If EndBit is less than StartBit, then ASSERT().\r |
| | 433 | If AndData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().\r |
| | 434 | \r |
| | 435 | @param Operand Operand on which to perform the bitfield operation.\r |
| | 436 | @param StartBit The ordinal of the least significant bit in the bit field.\r |
| | 437 | Range 0..15.\r |
| | 438 | @param EndBit The ordinal of the most significant bit in the bit field.\r |
| | 439 | Range 0..15.\r |
| | 440 | @param AndData The value to AND with the read value from the value.\r |
| | 441 | \r |
| | 442 | @return The new 16-bit value.\r |
| | 443 | \r |
| | 444 | **/\r |
| | 445 | UINT16\r |
| | 446 | EFIAPI\r |
| | 447 | BitFieldAnd16 (\r |
| | 448 | IN UINT16 Operand,\r |
| | 449 | IN UINTN StartBit,\r |
| | 450 | IN UINTN EndBit,\r |
| | 451 | IN UINT16 AndData\r |
| | 452 | )\r |
| | 453 | {\r |
| | 454 | ASSERT (EndBit < 16);\r |
| | 455 | ASSERT (StartBit <= EndBit);\r |
| | 456 | return (UINT16)InternalBaseLibBitFieldAndUint (Operand, StartBit, EndBit, AndData);\r |
| | 457 | }\r |
| | 458 | \r |
| | 459 | /**\r |
| | 460 | Reads a bit field from a 16-bit value, performs a bitwise AND followed by a\r |
| | 461 | bitwise OR, and returns the result.\r |
| | 462 | \r |
| | 463 | Performs a bitwise AND between the bit field specified by StartBit and EndBit\r |
| | 464 | in Operand and the value specified by AndData, followed by a bitwise\r |
| | 465 | OR with value specified by OrData. All other bits in Operand are\r |
| | 466 | preserved. The new 16-bit value is returned.\r |
| | 467 | \r |
| | 468 | If 16-bit operations are not supported, then ASSERT().\r |
| | 469 | If StartBit is greater than 15, then ASSERT().\r |
| | 470 | If EndBit is greater than 15, then ASSERT().\r |
| | 471 | If EndBit is less than StartBit, then ASSERT().\r |
| | 472 | If AndData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().\r |
| | 473 | If OrData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().\r |
| | 474 | \r |
| | 475 | @param Operand Operand on which to perform the bitfield operation.\r |
| | 476 | @param StartBit The ordinal of the least significant bit in the bit field.\r |
| | 477 | Range 0..15.\r |
| | 478 | @param EndBit The ordinal of the most significant bit in the bit field.\r |
| | 479 | Range 0..15.\r |
| | 480 | @param AndData The value to AND with the read value from the value.\r |
| | 481 | @param OrData The value to OR with the result of the AND operation.\r |
| | 482 | \r |
| | 483 | @return The new 16-bit value.\r |
| | 484 | \r |
| | 485 | **/\r |
| | 486 | UINT16\r |
| | 487 | EFIAPI\r |
| | 488 | BitFieldAndThenOr16 (\r |
| | 489 | IN UINT16 Operand,\r |
| | 490 | IN UINTN StartBit,\r |
| | 491 | IN UINTN EndBit,\r |
| | 492 | IN UINT16 AndData,\r |
| | 493 | IN UINT16 OrData\r |
| | 494 | )\r |
| | 495 | {\r |
| | 496 | ASSERT (EndBit < 16);\r |
| | 497 | ASSERT (StartBit <= EndBit);\r |
| | 498 | return BitFieldOr16 (\r |
| | 499 | BitFieldAnd16 (Operand, StartBit, EndBit, AndData),\r |
| | 500 | StartBit,\r |
| | 501 | EndBit,\r |
| | 502 | OrData\r |
| | 503 | );\r |
| | 504 | }\r |
| | 505 | \r |
| | 506 | /**\r |
| | 507 | Returns a bit field from a 32-bit value.\r |
| | 508 | \r |
| | 509 | Returns the bitfield specified by the StartBit and the EndBit from Operand.\r |
| | 510 | \r |
| | 511 | If 32-bit operations are not supported, then ASSERT().\r |
| | 512 | If StartBit is greater than 31, then ASSERT().\r |
| | 513 | If EndBit is greater than 31, then ASSERT().\r |
| | 514 | If EndBit is less than StartBit, then ASSERT().\r |
| | 515 | \r |
| | 516 | @param Operand Operand on which to perform the bitfield operation.\r |
| | 517 | @param StartBit The ordinal of the least significant bit in the bit field.\r |
| | 518 | Range 0..31.\r |
| | 519 | @param EndBit The ordinal of the most significant bit in the bit field.\r |
| | 520 | Range 0..31.\r |
| | 521 | \r |
| | 522 | @return The bit field read.\r |
| | 523 | \r |
| | 524 | **/\r |
| | 525 | UINT32\r |
| | 526 | EFIAPI\r |
| | 527 | BitFieldRead32 (\r |
| | 528 | IN UINT32 Operand,\r |
| | 529 | IN UINTN StartBit,\r |
| | 530 | IN UINTN EndBit\r |
| | 531 | )\r |
| | 532 | {\r |
| | 533 | ASSERT (EndBit < 32);\r |
| | 534 | ASSERT (StartBit <= EndBit);\r |
| | 535 | return (UINT32)InternalBaseLibBitFieldReadUint (Operand, StartBit, EndBit);\r |
| | 536 | }\r |
| | 537 | \r |
| | 538 | /**\r |
| | 539 | Writes a bit field to a 32-bit value, and returns the result.\r |
| | 540 | \r |
| | 541 | Writes Value to the bit field specified by the StartBit and the EndBit in\r |
| | 542 | Operand. All other bits in Operand are preserved. The new 32-bit value is\r |
| | 543 | returned.\r |
| | 544 | \r |
| | 545 | If 32-bit operations are not supported, then ASSERT().\r |
| | 546 | If StartBit is greater than 31, then ASSERT().\r |
| | 547 | If EndBit is greater than 31, then ASSERT().\r |
| | 548 | If EndBit is less than StartBit, then ASSERT().\r |
| | 549 | If Value is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().\r |
| | 550 | \r |
| | 551 | @param Operand Operand on which to perform the bitfield operation.\r |
| | 552 | @param StartBit The ordinal of the least significant bit in the bit field.\r |
| | 553 | Range 0..31.\r |
| | 554 | @param EndBit The ordinal of the most significant bit in the bit field.\r |
| | 555 | Range 0..31.\r |
| | 556 | @param Value The new value of the bit field.\r |
| | 557 | \r |
| | 558 | @return The new 32-bit value.\r |
| | 559 | \r |
| | 560 | **/\r |
| | 561 | UINT32\r |
| | 562 | EFIAPI\r |
| | 563 | BitFieldWrite32 (\r |
| | 564 | IN UINT32 Operand,\r |
| | 565 | IN UINTN StartBit,\r |
| | 566 | IN UINTN EndBit,\r |
| | 567 | IN UINT32 Value\r |
| | 568 | )\r |
| | 569 | {\r |
| | 570 | ASSERT (EndBit < 32);\r |
| | 571 | ASSERT (StartBit <= EndBit);\r |
| | 572 | return BitFieldAndThenOr32 (Operand, StartBit, EndBit, 0, Value);\r |
| | 573 | }\r |
| | 574 | \r |
| | 575 | /**\r |
| | 576 | Reads a bit field from a 32-bit value, performs a bitwise OR, and returns the\r |
| | 577 | result.\r |
| | 578 | \r |
| | 579 | Performs a bitwise OR between the bit field specified by StartBit\r |
| | 580 | and EndBit in Operand and the value specified by OrData. All other bits in\r |
| | 581 | Operand are preserved. The new 32-bit value is returned.\r |
| | 582 | \r |
| | 583 | If 32-bit operations are not supported, then ASSERT().\r |
| | 584 | If StartBit is greater than 31, then ASSERT().\r |
| | 585 | If EndBit is greater than 31, then ASSERT().\r |
| | 586 | If EndBit is less than StartBit, then ASSERT().\r |
| | 587 | If OrData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().\r |
| | 588 | \r |
| | 589 | @param Operand Operand on which to perform the bitfield operation.\r |
| | 590 | @param StartBit The ordinal of the least significant bit in the bit field.\r |
| | 591 | Range 0..31.\r |
| | 592 | @param EndBit The ordinal of the most significant bit in the bit field.\r |
| | 593 | Range 0..31.\r |
| | 594 | @param OrData The value to OR with the read value from the value.\r |
| | 595 | \r |
| | 596 | @return The new 32-bit value.\r |
| | 597 | \r |
| | 598 | **/\r |
| | 599 | UINT32\r |
| | 600 | EFIAPI\r |
| | 601 | BitFieldOr32 (\r |
| | 602 | IN UINT32 Operand,\r |
| | 603 | IN UINTN StartBit,\r |
| | 604 | IN UINTN EndBit,\r |
| | 605 | IN UINT32 OrData\r |
| | 606 | )\r |
| | 607 | {\r |
| | 608 | ASSERT (EndBit < 32);\r |
| | 609 | ASSERT (StartBit <= EndBit);\r |
| | 610 | return (UINT32)InternalBaseLibBitFieldOrUint (Operand, StartBit, EndBit, OrData);\r |
| | 611 | }\r |
| | 612 | \r |
| | 613 | /**\r |
| | 614 | Reads a bit field from a 32-bit value, performs a bitwise AND, and returns\r |
| | 615 | the result.\r |
| | 616 | \r |
| | 617 | Performs a bitwise AND between the bit field specified by StartBit and EndBit\r |
| | 618 | in Operand and the value specified by AndData. All other bits in Operand are\r |
| | 619 | preserved. The new 32-bit value is returned.\r |
| | 620 | \r |
| | 621 | If 32-bit operations are not supported, then ASSERT().\r |
| | 622 | If StartBit is greater than 31, then ASSERT().\r |
| | 623 | If EndBit is greater than 31, then ASSERT().\r |
| | 624 | If EndBit is less than StartBit, then ASSERT().\r |
| | 625 | If AndData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().\r |
| | 626 | \r |
| | 627 | @param Operand Operand on which to perform the bitfield operation.\r |
| | 628 | @param StartBit The ordinal of the least significant bit in the bit field.\r |
| | 629 | Range 0..31.\r |
| | 630 | @param EndBit The ordinal of the most significant bit in the bit field.\r |
| | 631 | Range 0..31.\r |
| | 632 | @param AndData The value to AND with the read value from the value.\r |
| | 633 | \r |
| | 634 | @return The new 32-bit value.\r |
| | 635 | \r |
| | 636 | **/\r |
| | 637 | UINT32\r |
| | 638 | EFIAPI\r |
| | 639 | BitFieldAnd32 (\r |
| | 640 | IN UINT32 Operand,\r |
| | 641 | IN UINTN StartBit,\r |
| | 642 | IN UINTN EndBit,\r |
| | 643 | IN UINT32 AndData\r |
| | 644 | )\r |
| | 645 | {\r |
| | 646 | ASSERT (EndBit < 32);\r |
| | 647 | ASSERT (StartBit <= EndBit);\r |
| | 648 | return (UINT32)InternalBaseLibBitFieldAndUint (Operand, StartBit, EndBit, AndData);\r |
| | 649 | }\r |
| | 650 | \r |
| | 651 | /**\r |
| | 652 | Reads a bit field from a 32-bit value, performs a bitwise AND followed by a\r |
| | 653 | bitwise OR, and returns the result.\r |
| | 654 | \r |
| | 655 | Performs a bitwise AND between the bit field specified by StartBit and EndBit\r |
| | 656 | in Operand and the value specified by AndData, followed by a bitwise\r |
| | 657 | OR with value specified by OrData. All other bits in Operand are\r |
| | 658 | preserved. The new 32-bit value is returned.\r |
| | 659 | \r |
| | 660 | If 32-bit operations are not supported, then ASSERT().\r |
| | 661 | If StartBit is greater than 31, then ASSERT().\r |
| | 662 | If EndBit is greater than 31, then ASSERT().\r |
| | 663 | If EndBit is less than StartBit, then ASSERT().\r |
| | 664 | If AndData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().\r |
| | 665 | If OrData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().\r |
| | 666 | \r |
| | 667 | @param Operand Operand on which to perform the bitfield operation.\r |
| | 668 | @param StartBit The ordinal of the least significant bit in the bit field.\r |
| | 669 | Range 0..31.\r |
| | 670 | @param EndBit The ordinal of the most significant bit in the bit field.\r |
| | 671 | Range 0..31.\r |
| | 672 | @param AndData The value to AND with the read value from the value.\r |
| | 673 | @param OrData The value to OR with the result of the AND operation.\r |
| | 674 | \r |
| | 675 | @return The new 32-bit value.\r |
| | 676 | \r |
| | 677 | **/\r |
| | 678 | UINT32\r |
| | 679 | EFIAPI\r |
| | 680 | BitFieldAndThenOr32 (\r |
| | 681 | IN UINT32 Operand,\r |
| | 682 | IN UINTN StartBit,\r |
| | 683 | IN UINTN EndBit,\r |
| | 684 | IN UINT32 AndData,\r |
| | 685 | IN UINT32 OrData\r |
| | 686 | )\r |
| | 687 | {\r |
| | 688 | ASSERT (EndBit < 32);\r |
| | 689 | ASSERT (StartBit <= EndBit);\r |
| | 690 | return BitFieldOr32 (\r |
| | 691 | BitFieldAnd32 (Operand, StartBit, EndBit, AndData),\r |
| | 692 | StartBit,\r |
| | 693 | EndBit,\r |
| | 694 | OrData\r |
| | 695 | );\r |
| | 696 | }\r |
| | 697 | \r |
| | 698 | /**\r |
| | 699 | Returns a bit field from a 64-bit value.\r |
| | 700 | \r |
| | 701 | Returns the bitfield specified by the StartBit and the EndBit from Operand.\r |
| | 702 | \r |
| | 703 | If 64-bit operations are not supported, then ASSERT().\r |
| | 704 | If StartBit is greater than 63, then ASSERT().\r |
| | 705 | If EndBit is greater than 63, then ASSERT().\r |
| | 706 | If EndBit is less than StartBit, then ASSERT().\r |
| | 707 | \r |
| | 708 | @param Operand Operand on which to perform the bitfield operation.\r |
| | 709 | @param StartBit The ordinal of the least significant bit in the bit field.\r |
| | 710 | Range 0..63.\r |
| | 711 | @param EndBit The ordinal of the most significant bit in the bit field.\r |
| | 712 | Range 0..63.\r |
| | 713 | \r |
| | 714 | @return The bit field read.\r |
| | 715 | \r |
| | 716 | **/\r |
| | 717 | UINT64\r |
| | 718 | EFIAPI\r |
| | 719 | BitFieldRead64 (\r |
| | 720 | IN UINT64 Operand,\r |
| | 721 | IN UINTN StartBit,\r |
| | 722 | IN UINTN EndBit\r |
| | 723 | )\r |
| | 724 | {\r |
| | 725 | ASSERT (EndBit < 64);\r |
| | 726 | ASSERT (StartBit <= EndBit);\r |
| | 727 | return RShiftU64 (Operand & ~LShiftU64 ((UINT64)-2, EndBit), StartBit);\r |
| | 728 | }\r |
| | 729 | \r |
| | 730 | /**\r |
| | 731 | Writes a bit field to a 64-bit value, and returns the result.\r |
| | 732 | \r |
| | 733 | Writes Value to the bit field specified by the StartBit and the EndBit in\r |
| | 734 | Operand. All other bits in Operand are preserved. The new 64-bit value is\r |
| | 735 | returned.\r |
| | 736 | \r |
| | 737 | If 64-bit operations are not supported, then ASSERT().\r |
| | 738 | If StartBit is greater than 63, then ASSERT().\r |
| | 739 | If EndBit is greater than 63, then ASSERT().\r |
| | 740 | If EndBit is less than StartBit, then ASSERT().\r |
| | 741 | If Value is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().\r |
| | 742 | \r |
| | 743 | @param Operand Operand on which to perform the bitfield operation.\r |
| | 744 | @param StartBit The ordinal of the least significant bit in the bit field.\r |
| | 745 | Range 0..63.\r |
| | 746 | @param EndBit The ordinal of the most significant bit in the bit field.\r |
| | 747 | Range 0..63.\r |
| | 748 | @param Value The new value of the bit field.\r |
| | 749 | \r |
| | 750 | @return The new 64-bit value.\r |
| | 751 | \r |
| | 752 | **/\r |
| | 753 | UINT64\r |
| | 754 | EFIAPI\r |
| | 755 | BitFieldWrite64 (\r |
| | 756 | IN UINT64 Operand,\r |
| | 757 | IN UINTN StartBit,\r |
| | 758 | IN UINTN EndBit,\r |
| | 759 | IN UINT64 Value\r |
| | 760 | )\r |
| | 761 | {\r |
| | 762 | ASSERT (EndBit < 64);\r |
| | 763 | ASSERT (StartBit <= EndBit);\r |
| | 764 | return BitFieldAndThenOr64 (Operand, StartBit, EndBit, 0, Value);\r |
| | 765 | }\r |
| | 766 | \r |
| | 767 | /**\r |
| | 768 | Reads a bit field from a 64-bit value, performs a bitwise OR, and returns the\r |
| | 769 | result.\r |
| | 770 | \r |
| | 771 | Performs a bitwise OR between the bit field specified by StartBit\r |
| | 772 | and EndBit in Operand and the value specified by OrData. All other bits in\r |
| | 773 | Operand are preserved. The new 64-bit value is returned.\r |
| | 774 | \r |
| | 775 | If 64-bit operations are not supported, then ASSERT().\r |
| | 776 | If StartBit is greater than 63, then ASSERT().\r |
| | 777 | If EndBit is greater than 63, then ASSERT().\r |
| | 778 | If EndBit is less than StartBit, then ASSERT().\r |
| | 779 | If OrData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().\r |
| | 780 | \r |
| | 781 | @param Operand Operand on which to perform the bitfield operation.\r |
| | 782 | @param StartBit The ordinal of the least significant bit in the bit field.\r |
| | 783 | Range 0..63.\r |
| | 784 | @param EndBit The ordinal of the most significant bit in the bit field.\r |
| | 785 | Range 0..63.\r |
| | 786 | @param OrData The value to OR with the read value from the value\r |
| | 787 | \r |
| | 788 | @return The new 64-bit value.\r |
| | 789 | \r |
| | 790 | **/\r |
| | 791 | UINT64\r |
| | 792 | EFIAPI\r |
| | 793 | BitFieldOr64 (\r |
| | 794 | IN UINT64 Operand,\r |
| | 795 | IN UINTN StartBit,\r |
| | 796 | IN UINTN EndBit,\r |
| | 797 | IN UINT64 OrData\r |
| | 798 | )\r |
| | 799 | {\r |
| | 800 | UINT64 Value1;\r |
| | 801 | UINT64 Value2;\r |
| | 802 | \r |
| | 803 | ASSERT (EndBit < 64);\r |
| | 804 | ASSERT (StartBit <= EndBit);\r |
| | 805 | //\r |
| | 806 | // Higher bits in OrData those are not used must be zero.\r |
| | 807 | //\r |
| | 808 | // EndBit - StartBit + 1 might be 64 while the result right shifting 64 on RShiftU64() API is invalid,\r |
| | 809 | // So the logic is updated to right shift (EndBit - StartBit) bits and compare the last bit directly.\r |
| | 810 | //\r |
| | 811 | ASSERT (RShiftU64 (OrData, EndBit - StartBit) == (RShiftU64 (OrData, EndBit - StartBit) & 1));\r |
| | 812 | \r |
| | 813 | Value1 = LShiftU64 (OrData, StartBit);\r |
| | 814 | Value2 = LShiftU64 ((UINT64)-2, EndBit);\r |
| | 815 | \r |
| | 816 | return Operand | (Value1 & ~Value2);\r |
| | 817 | }\r |
| | 818 | \r |
| | 819 | /**\r |
| | 820 | Reads a bit field from a 64-bit value, performs a bitwise AND, and returns\r |
| | 821 | the result.\r |
| | 822 | \r |
| | 823 | Performs a bitwise AND between the bit field specified by StartBit and EndBit\r |
| | 824 | in Operand and the value specified by AndData. All other bits in Operand are\r |
| | 825 | preserved. The new 64-bit value is returned.\r |
| | 826 | \r |
| | 827 | If 64-bit operations are not supported, then ASSERT().\r |
| | 828 | If StartBit is greater than 63, then ASSERT().\r |
| | 829 | If EndBit is greater than 63, then ASSERT().\r |
| | 830 | If EndBit is less than StartBit, then ASSERT().\r |
| | 831 | If AndData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().\r |
| | 832 | \r |
| | 833 | @param Operand Operand on which to perform the bitfield operation.\r |
| | 834 | @param StartBit The ordinal of the least significant bit in the bit field.\r |
| | 835 | Range 0..63.\r |
| | 836 | @param EndBit The ordinal of the most significant bit in the bit field.\r |
| | 837 | Range 0..63.\r |
| | 838 | @param AndData The value to AND with the read value from the value.\r |
| | 839 | \r |
| | 840 | @return The new 64-bit value.\r |
| | 841 | \r |
| | 842 | **/\r |
| | 843 | UINT64\r |
| | 844 | EFIAPI\r |
| | 845 | BitFieldAnd64 (\r |
| | 846 | IN UINT64 Operand,\r |
| | 847 | IN UINTN StartBit,\r |
| | 848 | IN UINTN EndBit,\r |
| | 849 | IN UINT64 AndData\r |
| | 850 | )\r |
| | 851 | {\r |
| | 852 | UINT64 Value1;\r |
| | 853 | UINT64 Value2;\r |
| | 854 | \r |
| | 855 | ASSERT (EndBit < 64);\r |
| | 856 | ASSERT (StartBit <= EndBit);\r |
| | 857 | //\r |
| | 858 | // Higher bits in AndData those are not used must be zero.\r |
| | 859 | //\r |
| | 860 | // EndBit - StartBit + 1 might be 64 while the right shifting 64 on RShiftU64() API is invalid,\r |
| | 861 | // So the logic is updated to right shift (EndBit - StartBit) bits and compare the last bit directly.\r |
| | 862 | //\r |
| | 863 | ASSERT (RShiftU64 (AndData, EndBit - StartBit) == (RShiftU64 (AndData, EndBit - StartBit) & 1));\r |
| | 864 | \r |
| | 865 | Value1 = LShiftU64 (~AndData, StartBit);\r |
| | 866 | Value2 = LShiftU64 ((UINT64)-2, EndBit);\r |
| | 867 | \r |
| | 868 | return Operand & ~(Value1 & ~Value2);\r |
| | 869 | }\r |
| | 870 | \r |
| | 871 | /**\r |
| | 872 | Reads a bit field from a 64-bit value, performs a bitwise AND followed by a\r |
| | 873 | bitwise OR, and returns the result.\r |
| | 874 | \r |
| | 875 | Performs a bitwise AND between the bit field specified by StartBit and EndBit\r |
| | 876 | in Operand and the value specified by AndData, followed by a bitwise\r |
| | 877 | OR with value specified by OrData. All other bits in Operand are\r |
| | 878 | preserved. The new 64-bit value is returned.\r |
| | 879 | \r |
| | 880 | If 64-bit operations are not supported, then ASSERT().\r |
| | 881 | If StartBit is greater than 63, then ASSERT().\r |
| | 882 | If EndBit is greater than 63, then ASSERT().\r |
| | 883 | If EndBit is less than StartBit, then ASSERT().\r |
| | 884 | If AndData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().\r |
| | 885 | If OrData is larger than the bitmask value range specified by StartBit and EndBit, then ASSERT().\r |
| | 886 | \r |
| | 887 | @param Operand Operand on which to perform the bitfield operation.\r |
| | 888 | @param StartBit The ordinal of the least significant bit in the bit field.\r |
| | 889 | Range 0..63.\r |
| | 890 | @param EndBit The ordinal of the most significant bit in the bit field.\r |
| | 891 | Range 0..63.\r |
| | 892 | @param AndData The value to AND with the read value from the value.\r |
| | 893 | @param OrData The value to OR with the result of the AND operation.\r |
| | 894 | \r |
| | 895 | @return The new 64-bit value.\r |
| | 896 | \r |
| | 897 | **/\r |
| | 898 | UINT64\r |
| | 899 | EFIAPI\r |
| | 900 | BitFieldAndThenOr64 (\r |
| | 901 | IN UINT64 Operand,\r |
| | 902 | IN UINTN StartBit,\r |
| | 903 | IN UINTN EndBit,\r |
| | 904 | IN UINT64 AndData,\r |
| | 905 | IN UINT64 OrData\r |
| | 906 | )\r |
| | 907 | {\r |
| | 908 | ASSERT (EndBit < 64);\r |
| | 909 | ASSERT (StartBit <= EndBit);\r |
| | 910 | return BitFieldOr64 (\r |
| | 911 | BitFieldAnd64 (Operand, StartBit, EndBit, AndData),\r |
| | 912 | StartBit,\r |
| | 913 | EndBit,\r |
| | 914 | OrData\r |
| | 915 | );\r |
| | 916 | }\r |
| | 917 | \r |
| | 918 | /**\r |
| | 919 | Reads a bit field from a 32-bit value, counts and returns\r |
| | 920 | the number of set bits.\r |
| | 921 | \r |
| | 922 | Counts the number of set bits in the bit field specified by\r |
| | 923 | StartBit and EndBit in Operand. The count is returned.\r |
| | 924 | \r |
| | 925 | If StartBit is greater than 31, then ASSERT().\r |
| | 926 | If EndBit is greater than 31, then ASSERT().\r |
| | 927 | If EndBit is less than StartBit, then ASSERT().\r |
| | 928 | \r |
| | 929 | @param Operand Operand on which to perform the bitfield operation.\r |
| | 930 | @param StartBit The ordinal of the least significant bit in the bit field.\r |
| | 931 | Range 0..31.\r |
| | 932 | @param EndBit The ordinal of the most significant bit in the bit field.\r |
| | 933 | Range 0..31.\r |
| | 934 | \r |
| | 935 | @return The number of bits set between StartBit and EndBit.\r |
| | 936 | \r |
| | 937 | **/\r |
| | 938 | UINT8\r |
| | 939 | EFIAPI\r |
| | 940 | BitFieldCountOnes32 (\r |
| | 941 | IN UINT32 Operand,\r |
| | 942 | IN UINTN StartBit,\r |
| | 943 | IN UINTN EndBit\r |
| | 944 | )\r |
| | 945 | {\r |
| | 946 | UINT32 Count;\r |
| | 947 | \r |
| | 948 | ASSERT (EndBit < 32);\r |
| | 949 | ASSERT (StartBit <= EndBit);\r |
| | 950 | \r |
| | 951 | Count = BitFieldRead32 (Operand, StartBit, EndBit);\r |
| | 952 | Count -= ((Count >> 1) & 0x55555555);\r |
| | 953 | Count = (Count & 0x33333333) + ((Count >> 2) & 0x33333333);\r |
| | 954 | Count += Count >> 4;\r |
| | 955 | Count &= 0x0F0F0F0F;\r |
| | 956 | Count += Count >> 8;\r |
| | 957 | Count += Count >> 16;\r |
| | 958 | \r |
| | 959 | return (UINT8)Count & 0x3F;\r |
| | 960 | }\r |
| | 961 | \r |
| | 962 | /**\r |
| | 963 | Reads a bit field from a 64-bit value, counts and returns\r |
| | 964 | the number of set bits.\r |
| | 965 | \r |
| | 966 | Counts the number of set bits in the bit field specified by\r |
| | 967 | StartBit and EndBit in Operand. The count is returned.\r |
| | 968 | \r |
| | 969 | If StartBit is greater than 63, then ASSERT().\r |
| | 970 | If EndBit is greater than 63, then ASSERT().\r |
| | 971 | If EndBit is less than StartBit, then ASSERT().\r |
| | 972 | \r |
| | 973 | @param Operand Operand on which to perform the bitfield operation.\r |
| | 974 | @param StartBit The ordinal of the least significant bit in the bit field.\r |
| | 975 | Range 0..63.\r |
| | 976 | @param EndBit The ordinal of the most significant bit in the bit field.\r |
| | 977 | Range 0..63.\r |
| | 978 | \r |
| | 979 | @return The number of bits set between StartBit and EndBit.\r |
| | 980 | \r |
| | 981 | **/\r |
| | 982 | UINT8\r |
| | 983 | EFIAPI\r |
| | 984 | BitFieldCountOnes64 (\r |
| | 985 | IN UINT64 Operand,\r |
| | 986 | IN UINTN StartBit,\r |
| | 987 | IN UINTN EndBit\r |
| | 988 | )\r |
| | 989 | {\r |
| | 990 | UINT64 BitField;\r |
| | 991 | UINT8 Count;\r |
| | 992 | \r |
| | 993 | ASSERT (EndBit < 64);\r |
| | 994 | ASSERT (StartBit <= EndBit);\r |
| | 995 | \r |
| | 996 | BitField = BitFieldRead64 (Operand, StartBit, EndBit);\r |
| | 997 | Count = BitFieldCountOnes32 ((UINT32)BitField, 0, 31);\r |
| | 998 | Count += BitFieldCountOnes32 ((UINT32)RShiftU64 (BitField, 32), 0, 31);\r |
| | 999 | \r |
| | 1000 | return Count;\r |
| | 1001 | }\r |
projects / mirror_edk2.git / blame_incremental