[mirror_edk2.git] / MdePkg / Library / BaseLib / Ipf / Unaligned.c

/** @file\r
  Unaligned access functions of BaseLib for IPF.\r
\r
  Copyright (c) 2006 - 2008, Intel Corporation<BR>\r
  All rights reserved. This program and the accompanying materials\r
  are licensed and made available under the terms and conditions of the BSD License\r
  which accompanies this distribution.  The full text of the license may be found at\r
  http://opensource.org/licenses/bsd-license.php\r
\r
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
\r
#include "BaseLibInternals.h"\r
\r
/**\r
  Reads a 16-bit value from memory that may be unaligned.\r
\r
  This function returns the 16-bit value pointed to by Buffer. The function\r
  guarantees that the read operation does not produce an alignment fault.\r
\r
  If the Buffer is NULL, then ASSERT().\r
\r
  @param  Buffer  Pointer to a 16-bit value that may be unaligned.\r
\r
  @return The 16-bit value read from Buffer.\r
\r
**/\r
UINT16\r
EFIAPI\r
ReadUnaligned16 (\r
  IN CONST UINT16              *Buffer\r
  )\r
{\r
  ASSERT (Buffer != NULL);\r
\r
  return (UINT16)(((UINT8*)Buffer)[0] | (((UINT8*)Buffer)[1] << 8));\r
}\r
\r
/**\r
  Writes a 16-bit value to memory that may be unaligned.\r
\r
  This function writes the 16-bit value specified by Value to Buffer. Value is\r
  returned. The function guarantees that the write operation does not produce\r
  an alignment fault.\r
\r
  If the Buffer is NULL, then ASSERT().\r
\r
  @param  Buffer  Pointer to a 16-bit value that may be unaligned.\r
  @param  Value   16-bit value to write to Buffer.\r
\r
  @return The 16-bit value to write to Buffer.\r
\r
**/\r
UINT16\r
EFIAPI\r
WriteUnaligned16 (\r
  OUT UINT16                    *Buffer,\r
  IN  UINT16                    Value\r
  )\r
{\r
  ASSERT (Buffer != NULL);\r
\r
  ((UINT8*)Buffer)[0] = (UINT8)Value;\r
  ((UINT8*)Buffer)[1] = (UINT8)(Value >> 8);\r
\r
  return Value;\r
}\r
\r
/**\r
  Reads a 24-bit value from memory that may be unaligned.\r
\r
  This function returns the 24-bit value pointed to by Buffer. The function\r
  guarantees that the read operation does not produce an alignment fault.\r
\r
  If the Buffer is NULL, then ASSERT().\r
\r
  @param  Buffer  Pointer to a 24-bit value that may be unaligned.\r
\r
  @return The 24-bit value read from Buffer.\r
\r
**/\r
UINT32\r
EFIAPI\r
ReadUnaligned24 (\r
  IN CONST UINT32              *Buffer\r
  )\r
{\r
  ASSERT (Buffer != NULL);\r
\r
  return (UINT32)(\r
            ReadUnaligned16 ((UINT16*)Buffer) |\r
            (((UINT8*)Buffer)[2] << 16)\r
            );\r
}\r
\r
/**\r
  Writes a 24-bit value to memory that may be unaligned.\r
\r
  This function writes the 24-bit value specified by Value to Buffer. Value is\r
  returned. The function guarantees that the write operation does not produce\r
  an alignment fault.\r
\r
  If the Buffer is NULL, then ASSERT().\r
\r
  @param  Buffer  Pointer to a 24-bit value that may be unaligned.\r
  @param  Value   24-bit value to write to Buffer.\r
\r
  @return The 24-bit value to write to Buffer.\r
\r
**/\r
UINT32\r
EFIAPI\r
WriteUnaligned24 (\r
  OUT UINT32                    *Buffer,\r
  IN  UINT32                    Value\r
  )\r
{\r
  ASSERT (Buffer != NULL);\r
\r
  WriteUnaligned16 ((UINT16*)Buffer, (UINT16)Value);\r
  *(UINT8*)((UINT16*)Buffer + 1) = (UINT8)(Value >> 16);\r
  return Value;\r
}\r
\r
/**\r
  Reads a 32-bit value from memory that may be unaligned.\r
\r
  This function returns the 32-bit value pointed to by Buffer. The function\r
  guarantees that the read operation does not produce an alignment fault.\r
\r
  If the Buffer is NULL, then ASSERT().\r
\r
  @param  Buffer  Pointer to a 32-bit value that may be unaligned.\r
\r
  @return The 32-bit value read from Buffer.\r
\r
**/\r
UINT32\r
EFIAPI\r
ReadUnaligned32 (\r
  IN CONST UINT32              *Buffer\r
  )\r
{\r
  UINT16  LowerBytes;\r
  UINT16  HigherBytes;\r
\r
  ASSERT (Buffer != NULL);\r
\r
  LowerBytes  = ReadUnaligned16 ((UINT16*) Buffer);\r
  HigherBytes = ReadUnaligned16 ((UINT16*) Buffer + 1);\r
\r
  return (UINT32) (LowerBytes | (HigherBytes << 16));\r
}\r
\r
/**\r
  Writes a 32-bit value to memory that may be unaligned.\r
\r
  This function writes the 32-bit value specified by Value to Buffer. Value is\r
  returned. The function guarantees that the write operation does not produce\r
  an alignment fault.\r
\r
  If the Buffer is NULL, then ASSERT().\r
\r
  @param  Buffer  Pointer to a 32-bit value that may be unaligned.\r
  @param  Value   32-bit value to write to Buffer.\r
\r
  @return The 32-bit value to write to Buffer.\r
\r
**/\r
UINT32\r
EFIAPI\r
WriteUnaligned32 (\r
  OUT UINT32                    *Buffer,\r
  IN  UINT32                    Value\r
  )\r
{\r
  ASSERT (Buffer != NULL);\r
\r
  WriteUnaligned16 ((UINT16*)Buffer, (UINT16)Value);\r
  WriteUnaligned16 ((UINT16*)Buffer + 1, (UINT16)(Value >> 16));\r
  return Value;\r
}\r
\r
/**\r
  Reads a 64-bit value from memory that may be unaligned.\r
\r
  This function returns the 64-bit value pointed to by Buffer. The function\r
  guarantees that the read operation does not produce an alignment fault.\r
\r
  If the Buffer is NULL, then ASSERT().\r
\r
  @param  Buffer  Pointer to a 64-bit value that may be unaligned.\r
\r
  @return The 64-bit value read from Buffer.\r
\r
**/\r
UINT64\r
EFIAPI\r
ReadUnaligned64 (\r
  IN CONST UINT64              *Buffer\r
  )\r
{\r
  UINT32  LowerBytes;\r
  UINT32  HigherBytes;\r
\r
  ASSERT (Buffer != NULL);\r
\r
  LowerBytes  = ReadUnaligned32 ((UINT32*) Buffer);\r
  HigherBytes = ReadUnaligned32 ((UINT32*) Buffer + 1);\r
\r
  return (UINT64) (LowerBytes | LShiftU64 (HigherBytes, 32));\r
}\r
\r
/**\r
  Writes a 64-bit value to memory that may be unaligned.\r
\r
  This function writes the 64-bit value specified by Value to Buffer. Value is\r
  returned. The function guarantees that the write operation does not produce\r
  an alignment fault.\r
\r
  If the Buffer is NULL, then ASSERT().\r
\r
  @param  Buffer  Pointer to a 64-bit value that may be unaligned.\r
  @param  Value   64-bit value to write to Buffer.\r
\r
  @return The 64-bit value to write to Buffer.\r
\r
**/\r
UINT64\r
EFIAPI\r
WriteUnaligned64 (\r
  OUT UINT64                    *Buffer,\r
  IN  UINT64                    Value\r
  )\r
{\r
  ASSERT (Buffer != NULL);\r
\r
  WriteUnaligned32 ((UINT32*)Buffer, (UINT32)Value);\r
  WriteUnaligned32 ((UINT32*)Buffer + 1, (UINT32)RShiftU64 (Value, 32));\r
  return Value;\r
}\r
Commit	Line	Data
	1	/** @file\r
	2	Unaligned access functions of BaseLib for IPF.\r
	3	\r
	4	Copyright (c) 2006 - 2008, Intel Corporation<BR>\r
	5	All rights reserved. This program and the accompanying materials\r
	6	are licensed and made available under the terms and conditions of the BSD License\r
	7	which accompanies this distribution. The full text of the license may be found at\r
	8	http://opensource.org/licenses/bsd-license.php\r
	9	\r
	10	THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
	11	WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
	12	\r
	13	**/\r
	14	\r
	15	#include "BaseLibInternals.h"\r
	16	\r
	17	/**\r
	18	Reads a 16-bit value from memory that may be unaligned.\r
	19	\r
	20	This function returns the 16-bit value pointed to by Buffer. The function\r
	21	guarantees that the read operation does not produce an alignment fault.\r
	22	\r
	23	If the Buffer is NULL, then ASSERT().\r
	24	\r
	25	@param Buffer Pointer to a 16-bit value that may be unaligned.\r
	26	\r
	27	@return The 16-bit value read from Buffer.\r
	28	\r
	29	**/\r
	30	UINT16\r
	31	EFIAPI\r
	32	ReadUnaligned16 (\r
	33	IN CONST UINT16 *Buffer\r
	34	)\r
	35	{\r
	36	ASSERT (Buffer != NULL);\r
	37	\r
	38	return (UINT16)(((UINT8)Buffer)[0] \| (((UINT8)Buffer)[1] << 8));\r
	39	}\r
	40	\r
	41	/**\r
	42	Writes a 16-bit value to memory that may be unaligned.\r
	43	\r
	44	This function writes the 16-bit value specified by Value to Buffer. Value is\r
	45	returned. The function guarantees that the write operation does not produce\r
	46	an alignment fault.\r
	47	\r
	48	If the Buffer is NULL, then ASSERT().\r
	49	\r
	50	@param Buffer Pointer to a 16-bit value that may be unaligned.\r
	51	@param Value 16-bit value to write to Buffer.\r
	52	\r
	53	@return The 16-bit value to write to Buffer.\r
	54	\r
	55	**/\r
	56	UINT16\r
	57	EFIAPI\r
	58	WriteUnaligned16 (\r
	59	OUT UINT16 *Buffer,\r
	60	IN UINT16 Value\r
	61	)\r
	62	{\r
	63	ASSERT (Buffer != NULL);\r
	64	\r
	65	((UINT8*)Buffer)[0] = (UINT8)Value;\r
	66	((UINT8*)Buffer)[1] = (UINT8)(Value >> 8);\r
	67	\r
	68	return Value;\r
	69	}\r
	70	\r
	71	/**\r
	72	Reads a 24-bit value from memory that may be unaligned.\r
	73	\r
	74	This function returns the 24-bit value pointed to by Buffer. The function\r
	75	guarantees that the read operation does not produce an alignment fault.\r
	76	\r
	77	If the Buffer is NULL, then ASSERT().\r
	78	\r
	79	@param Buffer Pointer to a 24-bit value that may be unaligned.\r
	80	\r
	81	@return The 24-bit value read from Buffer.\r
	82	\r
	83	**/\r
	84	UINT32\r
	85	EFIAPI\r
	86	ReadUnaligned24 (\r
	87	IN CONST UINT32 *Buffer\r
	88	)\r
	89	{\r
	90	ASSERT (Buffer != NULL);\r
	91	\r
	92	return (UINT32)(\r
	93	ReadUnaligned16 ((UINT16*)Buffer) \|\r
	94	(((UINT8*)Buffer)[2] << 16)\r
	95	);\r
	96	}\r
	97	\r
	98	/**\r
	99	Writes a 24-bit value to memory that may be unaligned.\r
	100	\r
	101	This function writes the 24-bit value specified by Value to Buffer. Value is\r
	102	returned. The function guarantees that the write operation does not produce\r
	103	an alignment fault.\r
	104	\r
	105	If the Buffer is NULL, then ASSERT().\r
	106	\r
	107	@param Buffer Pointer to a 24-bit value that may be unaligned.\r
	108	@param Value 24-bit value to write to Buffer.\r
	109	\r
	110	@return The 24-bit value to write to Buffer.\r
	111	\r
	112	**/\r
	113	UINT32\r
	114	EFIAPI\r
	115	WriteUnaligned24 (\r
	116	OUT UINT32 *Buffer,\r
	117	IN UINT32 Value\r
	118	)\r
	119	{\r
	120	ASSERT (Buffer != NULL);\r
	121	\r
	122	WriteUnaligned16 ((UINT16*)Buffer, (UINT16)Value);\r
	123	(UINT8)((UINT16*)Buffer + 1) = (UINT8)(Value >> 16);\r
	124	return Value;\r
	125	}\r
	126	\r
	127	/**\r
	128	Reads a 32-bit value from memory that may be unaligned.\r
	129	\r
	130	This function returns the 32-bit value pointed to by Buffer. The function\r
	131	guarantees that the read operation does not produce an alignment fault.\r
	132	\r
	133	If the Buffer is NULL, then ASSERT().\r
	134	\r
	135	@param Buffer Pointer to a 32-bit value that may be unaligned.\r
	136	\r
	137	@return The 32-bit value read from Buffer.\r
	138	\r
	139	**/\r
	140	UINT32\r
	141	EFIAPI\r
	142	ReadUnaligned32 (\r
	143	IN CONST UINT32 *Buffer\r
	144	)\r
	145	{\r
	146	UINT16 LowerBytes;\r
	147	UINT16 HigherBytes;\r
	148	\r
	149	ASSERT (Buffer != NULL);\r
	150	\r
	151	LowerBytes = ReadUnaligned16 ((UINT16*) Buffer);\r
	152	HigherBytes = ReadUnaligned16 ((UINT16*) Buffer + 1);\r
	153	\r
	154	return (UINT32) (LowerBytes \| (HigherBytes << 16));\r
	155	}\r
	156	\r
	157	/**\r
	158	Writes a 32-bit value to memory that may be unaligned.\r
	159	\r
	160	This function writes the 32-bit value specified by Value to Buffer. Value is\r
	161	returned. The function guarantees that the write operation does not produce\r
	162	an alignment fault.\r
	163	\r
	164	If the Buffer is NULL, then ASSERT().\r
	165	\r
	166	@param Buffer Pointer to a 32-bit value that may be unaligned.\r
	167	@param Value 32-bit value to write to Buffer.\r
	168	\r
	169	@return The 32-bit value to write to Buffer.\r
	170	\r
	171	**/\r
	172	UINT32\r
	173	EFIAPI\r
	174	WriteUnaligned32 (\r
	175	OUT UINT32 *Buffer,\r
	176	IN UINT32 Value\r
	177	)\r
	178	{\r
	179	ASSERT (Buffer != NULL);\r
	180	\r
	181	WriteUnaligned16 ((UINT16*)Buffer, (UINT16)Value);\r
	182	WriteUnaligned16 ((UINT16*)Buffer + 1, (UINT16)(Value >> 16));\r
	183	return Value;\r
	184	}\r
	185	\r
	186	/**\r
	187	Reads a 64-bit value from memory that may be unaligned.\r
	188	\r
	189	This function returns the 64-bit value pointed to by Buffer. The function\r
	190	guarantees that the read operation does not produce an alignment fault.\r
	191	\r
	192	If the Buffer is NULL, then ASSERT().\r
	193	\r
	194	@param Buffer Pointer to a 64-bit value that may be unaligned.\r
	195	\r
	196	@return The 64-bit value read from Buffer.\r
	197	\r
	198	**/\r
	199	UINT64\r
	200	EFIAPI\r
	201	ReadUnaligned64 (\r
	202	IN CONST UINT64 *Buffer\r
	203	)\r
	204	{\r
	205	UINT32 LowerBytes;\r
	206	UINT32 HigherBytes;\r
	207	\r
	208	ASSERT (Buffer != NULL);\r
	209	\r
	210	LowerBytes = ReadUnaligned32 ((UINT32*) Buffer);\r
	211	HigherBytes = ReadUnaligned32 ((UINT32*) Buffer + 1);\r
	212	\r
	213	return (UINT64) (LowerBytes \| LShiftU64 (HigherBytes, 32));\r
	214	}\r
	215	\r
	216	/**\r
	217	Writes a 64-bit value to memory that may be unaligned.\r
	218	\r
	219	This function writes the 64-bit value specified by Value to Buffer. Value is\r
	220	returned. The function guarantees that the write operation does not produce\r
	221	an alignment fault.\r
	222	\r
	223	If the Buffer is NULL, then ASSERT().\r
	224	\r
	225	@param Buffer Pointer to a 64-bit value that may be unaligned.\r
	226	@param Value 64-bit value to write to Buffer.\r
	227	\r
	228	@return The 64-bit value to write to Buffer.\r
	229	\r
	230	**/\r
	231	UINT64\r
	232	EFIAPI\r
	233	WriteUnaligned64 (\r
	234	OUT UINT64 *Buffer,\r
	235	IN UINT64 Value\r
	236	)\r
	237	{\r
	238	ASSERT (Buffer != NULL);\r
	239	\r
	240	WriteUnaligned32 ((UINT32*)Buffer, (UINT32)Value);\r
	241	WriteUnaligned32 ((UINT32*)Buffer + 1, (UINT32)RShiftU64 (Value, 32));\r
	242	return Value;\r
	243	}\r