MdePkg/Include/Base.h

   1 /** @file
   2   Root include file for Mde Package Base type modules
   3
   4   This is the include file for any module of type base. Base modules only use
   5   types defined via this include file and can be ported easily to any
   6   environment. There are a set of base libraries in the Mde Package that can
   7   be used to implement base modules.
   8
   9 Copyright (c) 2006 - 2014, Intel Corporation. All rights reserved.<BR>
  10 Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
  11 This program and the accompanying materials
  12 are licensed and made available under the terms and conditions of the BSD License
  13 which accompanies this distribution.  The full text of the license may be found at
  14 http://opensource.org/licenses/bsd-license.php.
  15
  16 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  17 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  18
  19 **/
  20
  21
  22 #ifndef __BASE_H__
  23 #define __BASE_H__
  24
  25 //
  26 // Include processor specific binding
  27 //
  28 #include <ProcessorBind.h>
  29
  30
  31 /**
  32   Verifies the storage size of a given data type.
  33
  34   This macro generates a divide by zero error or a zero size array declaration in
  35   the preprocessor if the size is incorrect.  These are declared as "extern" so
  36   the space for these arrays will not be in the modules.
  37
  38   @param  TYPE  The date type to determine the size of.
  39   @param  Size  The expected size for the TYPE.
  40
  41 **/
  42 #define VERIFY_SIZE_OF(TYPE, Size) extern UINT8 _VerifySizeof##TYPE[(sizeof(TYPE) == (Size)) / (sizeof(TYPE) == (Size))]
  43
  44 //
  45 // Verify that ProcessorBind.h produced UEFI Data Types that are compliant with
  46 // Section 2.3.1 of the UEFI 2.3 Specification.
  47 //
  48 VERIFY_SIZE_OF (BOOLEAN, 1);
  49 VERIFY_SIZE_OF (INT8, 1);
  50 VERIFY_SIZE_OF (UINT8, 1);
  51 VERIFY_SIZE_OF (INT16, 2);
  52 VERIFY_SIZE_OF (UINT16, 2);
  53 VERIFY_SIZE_OF (INT32, 4);
  54 VERIFY_SIZE_OF (UINT32, 4);
  55 VERIFY_SIZE_OF (INT64, 8);
  56 VERIFY_SIZE_OF (UINT64, 8);
  57 VERIFY_SIZE_OF (CHAR8, 1);
  58 VERIFY_SIZE_OF (CHAR16, 2);
  59
  60 //
  61 // The Microsoft* C compiler can removed references to unreferenced data items
  62 //  if the /OPT:REF linker option is used. We defined a macro as this is a
  63 //  a non standard extension
  64 //
  65 #if defined(_MSC_EXTENSIONS) && !defined (MDE_CPU_EBC)
  66   ///
  67   /// Remove global variable from the linked image if there are no references to
  68   /// it after all compiler and linker optimizations have been performed.
  69   ///
  70   ///
  71   #define GLOBAL_REMOVE_IF_UNREFERENCED __declspec(selectany)
  72 #else
  73   ///
  74   /// Remove the global variable from the linked image if there are no references
  75   ///  to it after all compiler and linker optimizations have been performed.
  76   ///
  77   ///
  78   #define GLOBAL_REMOVE_IF_UNREFERENCED
  79 #endif
  80
  81 //
  82 // For symbol name in assembly code, an extra "_" is sometimes necessary
  83 //
  84
  85 ///
  86 /// Private worker functions for ASM_PFX()
  87 ///
  88 #define _CONCATENATE(a, b)  __CONCATENATE(a, b)
  89 #define __CONCATENATE(a, b) a ## b
  90
  91 ///
  92 /// The __USER_LABEL_PREFIX__ macro predefined by GNUC represents the prefix
  93 /// on symbols in assembly language.
  94 ///
  95 #define ASM_PFX(name) _CONCATENATE (__USER_LABEL_PREFIX__, name)
  96
  97 #if __APPLE__
  98   //
  99   // Apple extension that is used by the linker to optimize code size
 100   // with assembly functions. Put at the end of your .S files
 101   //
 102   #define ASM_FUNCTION_REMOVE_IF_UNREFERENCED  .subsections_via_symbols
 103 #else
 104   #define ASM_FUNCTION_REMOVE_IF_UNREFERENCED
 105 #endif
 106
 107 #ifdef __CC_ARM
 108   //
 109   // Older RVCT ARM compilers don't fully support #pragma pack and require __packed
 110   // as a prefix for the structure.
 111   //
 112   #define PACKED  __packed
 113 #else
 114   #define PACKED
 115 #endif
 116
 117 ///
 118 /// 128 bit buffer containing a unique identifier value.
 119 /// Unless otherwise specified, aligned on a 64 bit boundary.
 120 ///
 121 typedef struct {
 122   UINT32  Data1;
 123   UINT16  Data2;
 124   UINT16  Data3;
 125   UINT8   Data4[8];
 126 } GUID;
 127
 128 //
 129 // 8-bytes unsigned value that represents a physical system address.
 130 //
 131 typedef UINT64 PHYSICAL_ADDRESS;
 132
 133 ///
 134 /// LIST_ENTRY structure definition.
 135 ///
 136 typedef struct _LIST_ENTRY LIST_ENTRY;
 137
 138 ///
 139 /// _LIST_ENTRY structure definition.
 140 ///
 141 struct _LIST_ENTRY {
 142   LIST_ENTRY  *ForwardLink;
 143   LIST_ENTRY  *BackLink;
 144 };
 145
 146 //
 147 // Modifiers to abstract standard types to aid in debug of problems
 148 //
 149
 150 ///
 151 /// Datum is read-only.
 152 ///
 153 #define CONST     const
 154
 155 ///
 156 /// Datum is scoped to the current file or function.
 157 ///
 158 #define STATIC    static
 159
 160 ///
 161 /// Undeclared type.
 162 ///
 163 #define VOID      void
 164
 165 //
 166 // Modifiers for Data Types used to self document code.
 167 // This concept is borrowed for UEFI specification.
 168 //
 169
 170 ///
 171 /// Datum is passed to the function.
 172 ///
 173 #define IN
 174
 175 ///
 176 /// Datum is returned from the function.
 177 ///
 178 #define OUT
 179
 180 ///
 181 /// Passing the datum to the function is optional, and a NULL
 182 /// is passed if the value is not supplied.
 183 ///
 184 #define OPTIONAL
 185
 186 //
 187 //  UEFI specification claims 1 and 0. We are concerned about the
 188 //  complier portability so we did it this way.
 189 //
 190
 191 ///
 192 /// Boolean true value.  UEFI Specification defines this value to be 1,
 193 /// but this form is more portable.
 194 ///
 195 #define TRUE  ((BOOLEAN)(1==1))
 196
 197 ///
 198 /// Boolean false value.  UEFI Specification defines this value to be 0,
 199 /// but this form is more portable.
 200 ///
 201 #define FALSE ((BOOLEAN)(0==1))
 202
 203 ///
 204 /// NULL pointer (VOID *)
 205 ///
 206 #define NULL  ((VOID *) 0)
 207
 208 ///
 209 /// Maximum values for common UEFI Data Types
 210 ///
 211 #define MAX_INT8    ((INT8)0x7F)
 212 #define MAX_UINT8   ((UINT8)0xFF)
 213 #define MAX_INT16   ((INT16)0x7FFF)
 214 #define MAX_UINT16  ((UINT16)0xFFFF)
 215 #define MAX_INT32   ((INT32)0x7FFFFFFF)
 216 #define MAX_UINT32  ((UINT32)0xFFFFFFFF)
 217 #define MAX_INT64   ((INT64)0x7FFFFFFFFFFFFFFFULL)
 218 #define MAX_UINT64  ((UINT64)0xFFFFFFFFFFFFFFFFULL)
 219
 220 #define  BIT0     0x00000001
 221 #define  BIT1     0x00000002
 222 #define  BIT2     0x00000004
 223 #define  BIT3     0x00000008
 224 #define  BIT4     0x00000010
 225 #define  BIT5     0x00000020
 226 #define  BIT6     0x00000040
 227 #define  BIT7     0x00000080
 228 #define  BIT8     0x00000100
 229 #define  BIT9     0x00000200
 230 #define  BIT10    0x00000400
 231 #define  BIT11    0x00000800
 232 #define  BIT12    0x00001000
 233 #define  BIT13    0x00002000
 234 #define  BIT14    0x00004000
 235 #define  BIT15    0x00008000
 236 #define  BIT16    0x00010000
 237 #define  BIT17    0x00020000
 238 #define  BIT18    0x00040000
 239 #define  BIT19    0x00080000
 240 #define  BIT20    0x00100000
 241 #define  BIT21    0x00200000
 242 #define  BIT22    0x00400000
 243 #define  BIT23    0x00800000
 244 #define  BIT24    0x01000000
 245 #define  BIT25    0x02000000
 246 #define  BIT26    0x04000000
 247 #define  BIT27    0x08000000
 248 #define  BIT28    0x10000000
 249 #define  BIT29    0x20000000
 250 #define  BIT30    0x40000000
 251 #define  BIT31    0x80000000
 252 #define  BIT32    0x0000000100000000ULL
 253 #define  BIT33    0x0000000200000000ULL
 254 #define  BIT34    0x0000000400000000ULL
 255 #define  BIT35    0x0000000800000000ULL
 256 #define  BIT36    0x0000001000000000ULL
 257 #define  BIT37    0x0000002000000000ULL
 258 #define  BIT38    0x0000004000000000ULL
 259 #define  BIT39    0x0000008000000000ULL
 260 #define  BIT40    0x0000010000000000ULL
 261 #define  BIT41    0x0000020000000000ULL
 262 #define  BIT42    0x0000040000000000ULL
 263 #define  BIT43    0x0000080000000000ULL
 264 #define  BIT44    0x0000100000000000ULL
 265 #define  BIT45    0x0000200000000000ULL
 266 #define  BIT46    0x0000400000000000ULL
 267 #define  BIT47    0x0000800000000000ULL
 268 #define  BIT48    0x0001000000000000ULL
 269 #define  BIT49    0x0002000000000000ULL
 270 #define  BIT50    0x0004000000000000ULL
 271 #define  BIT51    0x0008000000000000ULL
 272 #define  BIT52    0x0010000000000000ULL
 273 #define  BIT53    0x0020000000000000ULL
 274 #define  BIT54    0x0040000000000000ULL
 275 #define  BIT55    0x0080000000000000ULL
 276 #define  BIT56    0x0100000000000000ULL
 277 #define  BIT57    0x0200000000000000ULL
 278 #define  BIT58    0x0400000000000000ULL
 279 #define  BIT59    0x0800000000000000ULL
 280 #define  BIT60    0x1000000000000000ULL
 281 #define  BIT61    0x2000000000000000ULL
 282 #define  BIT62    0x4000000000000000ULL
 283 #define  BIT63    0x8000000000000000ULL
 284
 285 #define  SIZE_1KB    0x00000400
 286 #define  SIZE_2KB    0x00000800
 287 #define  SIZE_4KB    0x00001000
 288 #define  SIZE_8KB    0x00002000
 289 #define  SIZE_16KB   0x00004000
 290 #define  SIZE_32KB   0x00008000
 291 #define  SIZE_64KB   0x00010000
 292 #define  SIZE_128KB  0x00020000
 293 #define  SIZE_256KB  0x00040000
 294 #define  SIZE_512KB  0x00080000
 295 #define  SIZE_1MB    0x00100000
 296 #define  SIZE_2MB    0x00200000
 297 #define  SIZE_4MB    0x00400000
 298 #define  SIZE_8MB    0x00800000
 299 #define  SIZE_16MB   0x01000000
 300 #define  SIZE_32MB   0x02000000
 301 #define  SIZE_64MB   0x04000000
 302 #define  SIZE_128MB  0x08000000
 303 #define  SIZE_256MB  0x10000000
 304 #define  SIZE_512MB  0x20000000
 305 #define  SIZE_1GB    0x40000000
 306 #define  SIZE_2GB    0x80000000
 307 #define  SIZE_4GB    0x0000000100000000ULL
 308 #define  SIZE_8GB    0x0000000200000000ULL
 309 #define  SIZE_16GB   0x0000000400000000ULL
 310 #define  SIZE_32GB   0x0000000800000000ULL
 311 #define  SIZE_64GB   0x0000001000000000ULL
 312 #define  SIZE_128GB  0x0000002000000000ULL
 313 #define  SIZE_256GB  0x0000004000000000ULL
 314 #define  SIZE_512GB  0x0000008000000000ULL
 315 #define  SIZE_1TB    0x0000010000000000ULL
 316 #define  SIZE_2TB    0x0000020000000000ULL
 317 #define  SIZE_4TB    0x0000040000000000ULL
 318 #define  SIZE_8TB    0x0000080000000000ULL
 319 #define  SIZE_16TB   0x0000100000000000ULL
 320 #define  SIZE_32TB   0x0000200000000000ULL
 321 #define  SIZE_64TB   0x0000400000000000ULL
 322 #define  SIZE_128TB  0x0000800000000000ULL
 323 #define  SIZE_256TB  0x0001000000000000ULL
 324 #define  SIZE_512TB  0x0002000000000000ULL
 325 #define  SIZE_1PB    0x0004000000000000ULL
 326 #define  SIZE_2PB    0x0008000000000000ULL
 327 #define  SIZE_4PB    0x0010000000000000ULL
 328 #define  SIZE_8PB    0x0020000000000000ULL
 329 #define  SIZE_16PB   0x0040000000000000ULL
 330 #define  SIZE_32PB   0x0080000000000000ULL
 331 #define  SIZE_64PB   0x0100000000000000ULL
 332 #define  SIZE_128PB  0x0200000000000000ULL
 333 #define  SIZE_256PB  0x0400000000000000ULL
 334 #define  SIZE_512PB  0x0800000000000000ULL
 335 #define  SIZE_1EB    0x1000000000000000ULL
 336 #define  SIZE_2EB    0x2000000000000000ULL
 337 #define  SIZE_4EB    0x4000000000000000ULL
 338 #define  SIZE_8EB    0x8000000000000000ULL
 339
 340 #define  BASE_1KB    0x00000400
 341 #define  BASE_2KB    0x00000800
 342 #define  BASE_4KB    0x00001000
 343 #define  BASE_8KB    0x00002000
 344 #define  BASE_16KB   0x00004000
 345 #define  BASE_32KB   0x00008000
 346 #define  BASE_64KB   0x00010000
 347 #define  BASE_128KB  0x00020000
 348 #define  BASE_256KB  0x00040000
 349 #define  BASE_512KB  0x00080000
 350 #define  BASE_1MB    0x00100000
 351 #define  BASE_2MB    0x00200000
 352 #define  BASE_4MB    0x00400000
 353 #define  BASE_8MB    0x00800000
 354 #define  BASE_16MB   0x01000000
 355 #define  BASE_32MB   0x02000000
 356 #define  BASE_64MB   0x04000000
 357 #define  BASE_128MB  0x08000000
 358 #define  BASE_256MB  0x10000000
 359 #define  BASE_512MB  0x20000000
 360 #define  BASE_1GB    0x40000000
 361 #define  BASE_2GB    0x80000000
 362 #define  BASE_4GB    0x0000000100000000ULL
 363 #define  BASE_8GB    0x0000000200000000ULL
 364 #define  BASE_16GB   0x0000000400000000ULL
 365 #define  BASE_32GB   0x0000000800000000ULL
 366 #define  BASE_64GB   0x0000001000000000ULL
 367 #define  BASE_128GB  0x0000002000000000ULL
 368 #define  BASE_256GB  0x0000004000000000ULL
 369 #define  BASE_512GB  0x0000008000000000ULL
 370 #define  BASE_1TB    0x0000010000000000ULL
 371 #define  BASE_2TB    0x0000020000000000ULL
 372 #define  BASE_4TB    0x0000040000000000ULL
 373 #define  BASE_8TB    0x0000080000000000ULL
 374 #define  BASE_16TB   0x0000100000000000ULL
 375 #define  BASE_32TB   0x0000200000000000ULL
 376 #define  BASE_64TB   0x0000400000000000ULL
 377 #define  BASE_128TB  0x0000800000000000ULL
 378 #define  BASE_256TB  0x0001000000000000ULL
 379 #define  BASE_512TB  0x0002000000000000ULL
 380 #define  BASE_1PB    0x0004000000000000ULL
 381 #define  BASE_2PB    0x0008000000000000ULL
 382 #define  BASE_4PB    0x0010000000000000ULL
 383 #define  BASE_8PB    0x0020000000000000ULL
 384 #define  BASE_16PB   0x0040000000000000ULL
 385 #define  BASE_32PB   0x0080000000000000ULL
 386 #define  BASE_64PB   0x0100000000000000ULL
 387 #define  BASE_128PB  0x0200000000000000ULL
 388 #define  BASE_256PB  0x0400000000000000ULL
 389 #define  BASE_512PB  0x0800000000000000ULL
 390 #define  BASE_1EB    0x1000000000000000ULL
 391 #define  BASE_2EB    0x2000000000000000ULL
 392 #define  BASE_4EB    0x4000000000000000ULL
 393 #define  BASE_8EB    0x8000000000000000ULL
 394
 395 //
 396 //  Support for variable length argument lists using the ANSI standard.
 397 //
 398 //  Since we are using the ANSI standard we used the standard naming and
 399 //  did not follow the coding convention
 400 //
 401 //  VA_LIST  - typedef for argument list.
 402 //  VA_START (VA_LIST Marker, argument before the ...) - Init Marker for use.
 403 //  VA_END (VA_LIST Marker) - Clear Marker
 404 //  VA_ARG (VA_LIST Marker, var arg size) - Use Marker to get an argument from
 405 //    the ... list. You must know the size and pass it in this macro.
 406 //  VA_COPY (VA_LIST Dest, VA_LIST Start) - Initialize Dest as a copy of Start.
 407 //
 408 //  example:
 409 //
 410 //  UINTN
 411 //  ExampleVarArg (
 412 //    IN UINTN  NumberOfArgs,
 413 //    ...
 414 //    )
 415 //  {
 416 //    VA_LIST Marker;
 417 //    UINTN   Index;
 418 //    UINTN   Result;
 419 //
 420 //    //
 421 //    // Initialize the Marker
 422 //    //
 423 //    VA_START (Marker, NumberOfArgs);
 424 //    for (Index = 0, Result = 0; Index < NumberOfArgs; Index++) {
 425 //      //
 426 //      // The ... list is a series of UINTN values, so average them up.
 427 //      //
 428 //      Result += VA_ARG (Marker, UINTN);
 429 //    }
 430 //
 431 //    VA_END (Marker);
 432 //    return Result
 433 //  }
 434 //
 435
 436 /**
 437   Return the size of argument that has been aligned to sizeof (UINTN).
 438
 439   @param  n    The parameter size to be aligned.
 440
 441   @return The aligned size.
 442 **/
 443 #define _INT_SIZE_OF(n) ((sizeof (n) + sizeof (UINTN) - 1) &~(sizeof (UINTN) - 1))
 444
 445 #if defined(__CC_ARM)
 446 //
 447 // RVCT ARM variable argument list support.
 448 //
 449
 450 ///
 451 /// Variable used to traverse the list of arguments. This type can vary by
 452 /// implementation and could be an array or structure.
 453 ///
 454 #ifdef __APCS_ADSABI
 455   typedef int         *va_list[1];
 456   #define VA_LIST     va_list
 457 #else
 458   typedef struct __va_list { void *__ap; } va_list;
 459   #define VA_LIST                          va_list
 460 #endif
 461
 462 #define VA_START(Marker, Parameter)   __va_start(Marker, Parameter)
 463
 464 #define VA_ARG(Marker, TYPE)          __va_arg(Marker, TYPE)
 465
 466 #define VA_END(Marker)                ((void)0)
 467
 468 // For some ARM RVCT compilers, __va_copy is not defined
 469 #ifndef __va_copy
 470   #define __va_copy(dest, src) ((void)((dest) = (src)))
 471 #endif
 472
 473 #define VA_COPY(Dest, Start)          __va_copy (Dest, Start)
 474
 475 #elif defined(__GNUC__) && !defined(NO_BUILTIN_VA_FUNCS)
 476 //
 477 // Use GCC built-in macros for variable argument lists.
 478 //
 479
 480 ///
 481 /// Variable used to traverse the list of arguments. This type can vary by
 482 /// implementation and could be an array or structure.
 483 ///
 484 typedef __builtin_va_list VA_LIST;
 485
 486 #define VA_START(Marker, Parameter)  __builtin_va_start (Marker, Parameter)
 487
 488 #define VA_ARG(Marker, TYPE)         ((sizeof (TYPE) < sizeof (UINTN)) ? (TYPE)(__builtin_va_arg (Marker, UINTN)) : (TYPE)(__builtin_va_arg (Marker, TYPE)))
 489
 490 #define VA_END(Marker)               __builtin_va_end (Marker)
 491
 492 #define VA_COPY(Dest, Start)         __builtin_va_copy (Dest, Start)
 493
 494 #else
 495 ///
 496 /// Variable used to traverse the list of arguments. This type can vary by
 497 /// implementation and could be an array or structure.
 498 ///
 499 typedef CHAR8 *VA_LIST;
 500
 501 /**
 502   Retrieves a pointer to the beginning of a variable argument list, based on
 503   the name of the parameter that immediately precedes the variable argument list.
 504
 505   This function initializes Marker to point to the beginning of the variable
 506   argument list that immediately follows Parameter.  The method for computing the
 507   pointer to the next argument in the argument list is CPU-specific following the
 508   EFIAPI ABI.
 509
 510   @param   Marker       The VA_LIST used to traverse the list of arguments.
 511   @param   Parameter    The name of the parameter that immediately precedes
 512                         the variable argument list.
 513
 514   @return  A pointer to the beginning of a variable argument list.
 515
 516 **/
 517 #define VA_START(Marker, Parameter) (Marker = (VA_LIST) ((UINTN) & (Parameter) + _INT_SIZE_OF (Parameter)))
 518
 519 /**
 520   Returns an argument of a specified type from a variable argument list and updates
 521   the pointer to the variable argument list to point to the next argument.
 522
 523   This function returns an argument of the type specified by TYPE from the beginning
 524   of the variable argument list specified by Marker.  Marker is then updated to point
 525   to the next argument in the variable argument list.  The method for computing the
 526   pointer to the next argument in the argument list is CPU-specific following the EFIAPI ABI.
 527
 528   @param   Marker   VA_LIST used to traverse the list of arguments.
 529   @param   TYPE     The type of argument to retrieve from the beginning
 530                     of the variable argument list.
 531
 532   @return  An argument of the type specified by TYPE.
 533
 534 **/
 535 #define VA_ARG(Marker, TYPE)   (*(TYPE *) ((Marker += _INT_SIZE_OF (TYPE)) - _INT_SIZE_OF (TYPE)))
 536
 537 /**
 538   Terminates the use of a variable argument list.
 539
 540   This function initializes Marker so it can no longer be used with VA_ARG().
 541   After this macro is used, the only way to access the variable argument list is
 542   by using VA_START() again.
 543
 544   @param   Marker   VA_LIST used to traverse the list of arguments.
 545
 546 **/
 547 #define VA_END(Marker)      (Marker = (VA_LIST) 0)
 548
 549 /**
 550   Initializes a VA_LIST as a copy of an existing VA_LIST.
 551
 552   This macro initializes Dest as a copy of Start, as if the VA_START macro had been applied to Dest
 553   followed by the same sequence of uses of the VA_ARG macro as had previously been used to reach
 554   the present state of Start.
 555
 556   @param   Dest   VA_LIST used to traverse the list of arguments.
 557   @param   Start  VA_LIST used to traverse the list of arguments.
 558
 559 **/
 560 #define VA_COPY(Dest, Start)  ((void)((Dest) = (Start)))
 561
 562 #endif
 563
 564 ///
 565 /// Pointer to the start of a variable argument list stored in a memory buffer. Same as UINT8 *.
 566 ///
 567 typedef UINTN  *BASE_LIST;
 568
 569 /**
 570   Returns the size of a data type in sizeof(UINTN) units rounded up to the nearest UINTN boundary.
 571
 572   @param  TYPE  The date type to determine the size of.
 573
 574   @return The size of TYPE in sizeof (UINTN) units rounded up to the nearest UINTN boundary.
 575 **/
 576 #define _BASE_INT_SIZE_OF(TYPE) ((sizeof (TYPE) + sizeof (UINTN) - 1) / sizeof (UINTN))
 577
 578 /**
 579   Returns an argument of a specified type from a variable argument list and updates
 580   the pointer to the variable argument list to point to the next argument.
 581
 582   This function returns an argument of the type specified by TYPE from the beginning
 583   of the variable argument list specified by Marker.  Marker is then updated to point
 584   to the next argument in the variable argument list.  The method for computing the
 585   pointer to the next argument in the argument list is CPU specific following the EFIAPI ABI.
 586
 587   @param   Marker   The pointer to the beginning of a variable argument list.
 588   @param   TYPE     The type of argument to retrieve from the beginning
 589                     of the variable argument list.
 590
 591   @return  An argument of the type specified by TYPE.
 592
 593 **/
 594 #define BASE_ARG(Marker, TYPE)   (*(TYPE *) ((Marker += _BASE_INT_SIZE_OF (TYPE)) - _BASE_INT_SIZE_OF (TYPE)))
 595
 596 /**
 597   The macro that returns the byte offset of a field in a data structure.
 598
 599   This function returns the offset, in bytes, of field specified by Field from the
 600   beginning of the  data structure specified by TYPE. If TYPE does not contain Field,
 601   the module will not compile.
 602
 603   @param   TYPE     The name of the data structure that contains the field specified by Field.
 604   @param   Field    The name of the field in the data structure.
 605
 606   @return  Offset, in bytes, of field.
 607
 608 **/
 609 #ifdef __GNUC__
 610 #if __GNUC__ >= 4
 611 #define OFFSET_OF(TYPE, Field) ((UINTN) __builtin_offsetof(TYPE, Field))
 612 #endif
 613 #endif
 614
 615 #ifndef OFFSET_OF
 616 #define OFFSET_OF(TYPE, Field) ((UINTN) &(((TYPE *)0)->Field))
 617 #endif
 618
 619 /**
 620   Macro that returns a pointer to the data structure that contains a specified field of
 621   that data structure.  This is a lightweight method to hide information by placing a
 622   public data structure inside a larger private data structure and using a pointer to
 623   the public data structure to retrieve a pointer to the private data structure.
 624
 625   This function computes the offset, in bytes, of field specified by Field from the beginning
 626   of the  data structure specified by TYPE.  This offset is subtracted from Record, and is
 627   used to return a pointer to a data structure of the type specified by TYPE. If the data type
 628   specified by TYPE does not contain the field specified by Field, then the module will not compile.
 629
 630   @param   Record   Pointer to the field specified by Field within a data structure of type TYPE.
 631   @param   TYPE     The name of the data structure type to return.  This data structure must
 632                     contain the field specified by Field.
 633   @param   Field    The name of the field in the data structure specified by TYPE to which Record points.
 634
 635   @return  A pointer to the structure from one of it's elements.
 636
 637 **/
 638 #define BASE_CR(Record, TYPE, Field)  ((TYPE *) ((CHAR8 *) (Record) - (CHAR8 *) &(((TYPE *) 0)->Field)))
 639
 640 /**
 641   Rounds a value up to the next boundary using a specified alignment.
 642
 643   This function rounds Value up to the next boundary using the specified Alignment.
 644   This aligned value is returned.
 645
 646   @param   Value      The value to round up.
 647   @param   Alignment  The alignment boundary used to return the aligned value.
 648
 649   @return  A value up to the next boundary.
 650
 651 **/
 652 #define ALIGN_VALUE(Value, Alignment) ((Value) + (((Alignment) - (Value)) & ((Alignment) - 1)))
 653
 654 /**
 655   Adjust a pointer by adding the minimum offset required for it to be aligned on
 656   a specified alignment boundary.
 657
 658   This function rounds the pointer specified by Pointer to the next alignment boundary
 659   specified by Alignment. The pointer to the aligned address is returned.
 660
 661   @param   Pointer    The pointer to round up.
 662   @param   Alignment  The alignment boundary to use to return an aligned pointer.
 663
 664   @return  Pointer to the aligned address.
 665
 666 **/
 667 #define ALIGN_POINTER(Pointer, Alignment) ((VOID *) (ALIGN_VALUE ((UINTN)(Pointer), (Alignment))))
 668
 669 /**
 670   Rounds a value up to the next natural boundary for the current CPU.
 671   This is 4-bytes for 32-bit CPUs and 8-bytes for 64-bit CPUs.
 672
 673   This function rounds the value specified by Value up to the next natural boundary for the
 674   current CPU. This rounded value is returned.
 675
 676   @param   Value      The value to round up.
 677
 678   @return  Rounded value specified by Value.
 679
 680 **/
 681 #define ALIGN_VARIABLE(Value)  ALIGN_VALUE ((Value), sizeof (UINTN))
 682
 683
 684 /**
 685   Return the maximum of two operands.
 686
 687   This macro returns the maximum of two operand specified by a and b.
 688   Both a and b must be the same numerical types, signed or unsigned.
 689
 690   @param   a        The first operand with any numerical type.
 691   @param   b        The second operand. Can be any numerical type as long as is
 692                     the same type as a.
 693
 694   @return  Maximum of two operands.
 695
 696 **/
 697 #define MAX(a, b)                       \
 698   (((a) > (b)) ? (a) : (b))
 699
 700 /**
 701   Return the minimum of two operands.
 702
 703   This macro returns the minimal of two operand specified by a and b.
 704   Both a and b must be the same numerical types, signed or unsigned.
 705
 706   @param   a        The first operand with any numerical type.
 707   @param   b        The second operand. It should be the same any numerical type with a.
 708
 709   @return  Minimum of two operands.
 710
 711 **/
 712 #define MIN(a, b)                       \
 713   (((a) < (b)) ? (a) : (b))
 714
 715 /**
 716   Return the absolute value of a signed operand.
 717
 718   This macro returns the absolute value of the signed operand specified by a.
 719
 720   @param   a        The signed operand.
 721
 722   @return  The absolute value of the signed operand.
 723
 724 **/
 725 #define ABS(a)                          \
 726   (((a) < 0) ? (-(a)) : (a))
 727
 728 //
 729 // Status codes common to all execution phases
 730 //
 731 typedef UINTN RETURN_STATUS;
 732
 733 /**
 734   Produces a RETURN_STATUS code with the highest bit set.
 735
 736   @param  StatusCode    The status code value to convert into a warning code.
 737                         StatusCode must be in the range 0x00000000..0x7FFFFFFF.
 738
 739   @return The value specified by StatusCode with the highest bit set.
 740
 741 **/
 742 #define ENCODE_ERROR(StatusCode)     ((RETURN_STATUS)(MAX_BIT | (StatusCode)))
 743
 744 /**
 745   Produces a RETURN_STATUS code with the highest bit clear.
 746
 747   @param  StatusCode    The status code value to convert into a warning code.
 748                         StatusCode must be in the range 0x00000000..0x7FFFFFFF.
 749
 750   @return The value specified by StatusCode with the highest bit clear.
 751
 752 **/
 753 #define ENCODE_WARNING(StatusCode)   ((RETURN_STATUS)(StatusCode))
 754
 755 /**
 756   Returns TRUE if a specified RETURN_STATUS code is an error code.
 757
 758   This function returns TRUE if StatusCode has the high bit set.  Otherwise, FALSE is returned.
 759
 760   @param  StatusCode    The status code value to evaluate.
 761
 762   @retval TRUE          The high bit of StatusCode is set.
 763   @retval FALSE         The high bit of StatusCode is clear.
 764
 765 **/
 766 #define RETURN_ERROR(StatusCode)     (((INTN)(RETURN_STATUS)(StatusCode)) < 0)
 767
 768 ///
 769 /// The operation completed successfully.
 770 ///
 771 #define RETURN_SUCCESS               0
 772
 773 ///
 774 /// The image failed to load.
 775 ///
 776 #define RETURN_LOAD_ERROR            ENCODE_ERROR (1)
 777
 778 ///
 779 /// The parameter was incorrect.
 780 ///
 781 #define RETURN_INVALID_PARAMETER     ENCODE_ERROR (2)
 782
 783 ///
 784 /// The operation is not supported.
 785 ///
 786 #define RETURN_UNSUPPORTED           ENCODE_ERROR (3)
 787
 788 ///
 789 /// The buffer was not the proper size for the request.
 790 ///
 791 #define RETURN_BAD_BUFFER_SIZE       ENCODE_ERROR (4)
 792
 793 ///
 794 /// The buffer was not large enough to hold the requested data.
 795 /// The required buffer size is returned in the appropriate
 796 /// parameter when this error occurs.
 797 ///
 798 #define RETURN_BUFFER_TOO_SMALL      ENCODE_ERROR (5)
 799
 800 ///
 801 /// There is no data pending upon return.
 802 ///
 803 #define RETURN_NOT_READY             ENCODE_ERROR (6)
 804
 805 ///
 806 /// The physical device reported an error while attempting the
 807 /// operation.
 808 ///
 809 #define RETURN_DEVICE_ERROR          ENCODE_ERROR (7)
 810
 811 ///
 812 /// The device can not be written to.
 813 ///
 814 #define RETURN_WRITE_PROTECTED       ENCODE_ERROR (8)
 815
 816 ///
 817 /// The resource has run out.
 818 ///
 819 #define RETURN_OUT_OF_RESOURCES      ENCODE_ERROR (9)
 820
 821 ///
 822 /// An inconsistency was detected on the file system causing the
 823 /// operation to fail.
 824 ///
 825 #define RETURN_VOLUME_CORRUPTED      ENCODE_ERROR (10)
 826
 827 ///
 828 /// There is no more space on the file system.
 829 ///
 830 #define RETURN_VOLUME_FULL           ENCODE_ERROR (11)
 831
 832 ///
 833 /// The device does not contain any medium to perform the
 834 /// operation.
 835 ///
 836 #define RETURN_NO_MEDIA              ENCODE_ERROR (12)
 837
 838 ///
 839 /// The medium in the device has changed since the last
 840 /// access.
 841 ///
 842 #define RETURN_MEDIA_CHANGED         ENCODE_ERROR (13)
 843
 844 ///
 845 /// The item was not found.
 846 ///
 847 #define RETURN_NOT_FOUND             ENCODE_ERROR (14)
 848
 849 ///
 850 /// Access was denied.
 851 ///
 852 #define RETURN_ACCESS_DENIED         ENCODE_ERROR (15)
 853
 854 ///
 855 /// The server was not found or did not respond to the request.
 856 ///
 857 #define RETURN_NO_RESPONSE           ENCODE_ERROR (16)
 858
 859 ///
 860 /// A mapping to the device does not exist.
 861 ///
 862 #define RETURN_NO_MAPPING            ENCODE_ERROR (17)
 863
 864 ///
 865 /// A timeout time expired.
 866 ///
 867 #define RETURN_TIMEOUT               ENCODE_ERROR (18)
 868
 869 ///
 870 /// The protocol has not been started.
 871 ///
 872 #define RETURN_NOT_STARTED           ENCODE_ERROR (19)
 873
 874 ///
 875 /// The protocol has already been started.
 876 ///
 877 #define RETURN_ALREADY_STARTED       ENCODE_ERROR (20)
 878
 879 ///
 880 /// The operation was aborted.
 881 ///
 882 #define RETURN_ABORTED               ENCODE_ERROR (21)
 883
 884 ///
 885 /// An ICMP error occurred during the network operation.
 886 ///
 887 #define RETURN_ICMP_ERROR            ENCODE_ERROR (22)
 888
 889 ///
 890 /// A TFTP error occurred during the network operation.
 891 ///
 892 #define RETURN_TFTP_ERROR            ENCODE_ERROR (23)
 893
 894 ///
 895 /// A protocol error occurred during the network operation.
 896 ///
 897 #define RETURN_PROTOCOL_ERROR        ENCODE_ERROR (24)
 898
 899 ///
 900 /// A function encountered an internal version that was
 901 /// incompatible with a version requested by the caller.
 902 ///
 903 #define RETURN_INCOMPATIBLE_VERSION  ENCODE_ERROR (25)
 904
 905 ///
 906 /// The function was not performed due to a security violation.
 907 ///
 908 #define RETURN_SECURITY_VIOLATION    ENCODE_ERROR (26)
 909
 910 ///
 911 /// A CRC error was detected.
 912 ///
 913 #define RETURN_CRC_ERROR             ENCODE_ERROR (27)
 914
 915 ///
 916 /// The beginning or end of media was reached.
 917 ///
 918 #define RETURN_END_OF_MEDIA          ENCODE_ERROR (28)
 919
 920 ///
 921 /// The end of the file was reached.
 922 ///
 923 #define RETURN_END_OF_FILE           ENCODE_ERROR (31)
 924
 925 ///
 926 /// The language specified was invalid.
 927 ///
 928 #define RETURN_INVALID_LANGUAGE      ENCODE_ERROR (32)
 929
 930 ///
 931 /// The security status of the data is unknown or compromised
 932 /// and the data must be updated or replaced to restore a valid
 933 /// security status.
 934 ///
 935 #define RETURN_COMPROMISED_DATA      ENCODE_ERROR (33)
 936
 937 ///
 938 /// The string contained one or more characters that
 939 /// the device could not render and were skipped.
 940 ///
 941 #define RETURN_WARN_UNKNOWN_GLYPH    ENCODE_WARNING (1)
 942
 943 ///
 944 /// The handle was closed, but the file was not deleted.
 945 ///
 946 #define RETURN_WARN_DELETE_FAILURE   ENCODE_WARNING (2)
 947
 948 ///
 949 /// The handle was closed, but the data to the file was not
 950 /// flushed properly.
 951 ///
 952 #define RETURN_WARN_WRITE_FAILURE    ENCODE_WARNING (3)
 953
 954 ///
 955 /// The resulting buffer was too small, and the data was
 956 /// truncated to the buffer size.
 957 ///
 958 #define RETURN_WARN_BUFFER_TOO_SMALL ENCODE_WARNING (4)
 959
 960 ///
 961 /// The data has not been updated within the timeframe set by
 962 /// local policy for this type of data.
 963 ///
 964 #define RETURN_WARN_STALE_DATA       ENCODE_WARNING (5)
 965
 966 /**
 967   Returns a 16-bit signature built from 2 ASCII characters.
 968
 969   This macro returns a 16-bit value built from the two ASCII characters specified
 970   by A and B.
 971
 972   @param  A    The first ASCII character.
 973   @param  B    The second ASCII character.
 974
 975   @return A 16-bit value built from the two ASCII characters specified by A and B.
 976
 977 **/
 978 #define SIGNATURE_16(A, B)        ((A) | (B << 8))
 979
 980 /**
 981   Returns a 32-bit signature built from 4 ASCII characters.
 982
 983   This macro returns a 32-bit value built from the four ASCII characters specified
 984   by A, B, C, and D.
 985
 986   @param  A    The first ASCII character.
 987   @param  B    The second ASCII character.
 988   @param  C    The third ASCII character.
 989   @param  D    The fourth ASCII character.
 990
 991   @return A 32-bit value built from the two ASCII characters specified by A, B,
 992           C and D.
 993
 994 **/
 995 #define SIGNATURE_32(A, B, C, D)  (SIGNATURE_16 (A, B) | (SIGNATURE_16 (C, D) << 16))
 996
 997 /**
 998   Returns a 64-bit signature built from 8 ASCII characters.
 999
1000   This macro returns a 64-bit value built from the eight ASCII characters specified
1001   by A, B, C, D, E, F, G,and H.
1002
1003   @param  A    The first ASCII character.
1004   @param  B    The second ASCII character.
1005   @param  C    The third ASCII character.
1006   @param  D    The fourth ASCII character.
1007   @param  E    The fifth ASCII character.
1008   @param  F    The sixth ASCII character.
1009   @param  G    The seventh ASCII character.
1010   @param  H    The eighth ASCII character.
1011
1012   @return A 64-bit value built from the two ASCII characters specified by A, B,
1013           C, D, E, F, G and H.
1014
1015 **/
1016 #define SIGNATURE_64(A, B, C, D, E, F, G, H) \
1017     (SIGNATURE_32 (A, B, C, D) | ((UINT64) (SIGNATURE_32 (E, F, G, H)) << 32))
1018
1019 #if defined(_MSC_EXTENSIONS)
1020   //
1021   // Intrinsic function provides the address of the instruction in the calling
1022   // function that will be executed after control returns to the caller.
1023   //
1024   #pragma intrinsic(_ReturnAddress)
1025   #define RETURN_ADDRESS(L)     ((L == 0) ? _ReturnAddress() : (VOID *) 0)
1026 #elif defined(__GNUC__)
1027   //
1028   // Built-in Function returns the return address of the current function,
1029   // or of one of its callers.
1030   //
1031   void * __builtin_return_address (unsigned int level);
1032   #define RETURN_ADDRESS(L)     __builtin_return_address (L)
1033 #else
1034   //
1035   // Compilers don't support this feature.
1036   //
1037   #define RETURN_ADDRESS(L)     ((VOID *) 0)
1038 #endif
1039
1040 #endif
1041