[mirror_edk2.git] / MdePkg / Include / Protocol / LegacyRegion2.h

/** @file\r
  The Legacy Region Protocol controls the read, write and boot-lock attributes for\r
  the region 0xC0000 to 0xFFFFF.\r
\r
  Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>\r
  SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
  @par Revision Reference:\r
  This Protocol is defined in UEFI Platform Initialization Specification 1.2\r
  Volume 5: Standards\r
\r
**/\r
\r
#ifndef __LEGACY_REGION2_H__\r
#define __LEGACY_REGION2_H__\r
\r
#define EFI_LEGACY_REGION2_PROTOCOL_GUID \\r
{ \\r
  0x70101eaf, 0x85, 0x440c, {0xb3, 0x56, 0x8e, 0xe3, 0x6f, 0xef, 0x24, 0xf0 } \\r
}\r
\r
typedef struct _EFI_LEGACY_REGION2_PROTOCOL EFI_LEGACY_REGION2_PROTOCOL;\r
\r
/**\r
  Modify the hardware to allow (decode) or disallow (not decode) memory reads in a region.\r
\r
  If the On parameter evaluates to TRUE, this function enables memory reads in the address range\r
  Start to (Start + Length - 1).\r
  If the On parameter evaluates to FALSE, this function disables memory reads in the address range\r
  Start to (Start + Length - 1).\r
\r
  @param  This[in]              Indicates the EFI_LEGACY_REGION2_PROTOCOL instance.\r
  @param  Start[in]             The beginning of the physical address of the region whose attributes\r
                                should be modified.\r
  @param  Length[in]            The number of bytes of memory whose attributes should be modified.\r
                                The actual number of bytes modified may be greater than the number\r
                                specified.\r
  @param  Granularity[out]      The number of bytes in the last region affected. This may be less\r
                                than the total number of bytes affected if the starting address\r
                                was not aligned to a region's starting address or if the length\r
                                was greater than the number of bytes in the first region.\r
  @param  On[in]                Decode / Non-Decode flag.\r
\r
  @retval EFI_SUCCESS           The region's attributes were successfully modified.\r
  @retval EFI_INVALID_PARAMETER If Start or Length describe an address not in the Legacy Region.\r
\r
**/\r
typedef\r
EFI_STATUS\r
(EFIAPI *EFI_LEGACY_REGION2_DECODE)(\r
  IN  EFI_LEGACY_REGION2_PROTOCOL  *This,\r
  IN  UINT32                       Start,\r
  IN  UINT32                       Length,\r
  OUT UINT32                       *Granularity,\r
  IN  BOOLEAN                      *On\r
  );\r
\r
/**\r
  Modify the hardware to disallow memory writes in a region.\r
\r
  This function changes the attributes of a memory range to not allow writes.\r
\r
  @param  This[in]              Indicates the EFI_LEGACY_REGION2_PROTOCOL instance.\r
  @param  Start[in]             The beginning of the physical address of the region whose\r
                                attributes should be modified.\r
  @param  Length[in]            The number of bytes of memory whose attributes should be modified.\r
                                The actual number of bytes modified may be greater than the number\r
                                specified.\r
  @param  Granularity[out]      The number of bytes in the last region affected. This may be less\r
                                than the total number of bytes affected if the starting address was\r
                                not aligned to a region's starting address or if the length was\r
                                greater than the number of bytes in the first region.\r
\r
  @retval EFI_SUCCESS           The region's attributes were successfully modified.\r
  @retval EFI_INVALID_PARAMETER If Start or Length describe an address not in the Legacy Region.\r
\r
**/\r
typedef\r
EFI_STATUS\r
(EFIAPI *EFI_LEGACY_REGION2_LOCK)(\r
  IN  EFI_LEGACY_REGION2_PROTOCOL   *This,\r
  IN  UINT32                        Start,\r
  IN  UINT32                        Length,\r
  OUT UINT32                        *Granularity\r
  );\r
\r
/**\r
  Modify the hardware to disallow memory attribute changes in a region.\r
\r
  This function makes the attributes of a region read only. Once a region is boot-locked with this\r
  function, the read and write attributes of that region cannot be changed until a power cycle has\r
  reset the boot-lock attribute. Calls to Decode(), Lock() and Unlock() will have no effect.\r
\r
  @param  This[in]              Indicates the EFI_LEGACY_REGION2_PROTOCOL instance.\r
  @param  Start[in]             The beginning of the physical address of the region whose\r
                                attributes should be modified.\r
  @param  Length[in]            The number of bytes of memory whose attributes should be modified.\r
                                The actual number of bytes modified may be greater than the number\r
                                specified.\r
  @param  Granularity[out]      The number of bytes in the last region affected. This may be less\r
                                than the total number of bytes affected if the starting address was\r
                                not aligned to a region's starting address or if the length was\r
                                greater than the number of bytes in the first region.\r
\r
  @retval EFI_SUCCESS           The region's attributes were successfully modified.\r
  @retval EFI_INVALID_PARAMETER If Start or Length describe an address not in the Legacy Region.\r
  @retval EFI_UNSUPPORTED       The chipset does not support locking the configuration registers in\r
                                a way that will not affect memory regions outside the legacy memory\r
                                region.\r
\r
**/\r
typedef\r
EFI_STATUS\r
(EFIAPI *EFI_LEGACY_REGION2_BOOT_LOCK)(\r
  IN  EFI_LEGACY_REGION2_PROTOCOL         *This,\r
  IN  UINT32                              Start,\r
  IN  UINT32                              Length,\r
  OUT UINT32                              *Granularity OPTIONAL\r
  );\r
\r
/**\r
  Modify the hardware to allow memory writes in a region.\r
\r
  This function changes the attributes of a memory range to allow writes.\r
\r
  @param  This[in]              Indicates the EFI_LEGACY_REGION2_PROTOCOL instance.\r
  @param  Start[in]             The beginning of the physical address of the region whose\r
                                attributes should be modified.\r
  @param  Length[in]            The number of bytes of memory whose attributes should be modified.\r
                                The actual number of bytes modified may be greater than the number\r
                                specified.\r
  @param  Granularity[out]      The number of bytes in the last region affected. This may be less\r
                                than the total number of bytes affected if the starting address was\r
                                not aligned to a region's starting address or if the length was\r
                                greater than the number of bytes in the first region.\r
\r
  @retval EFI_SUCCESS           The region's attributes were successfully modified.\r
  @retval EFI_INVALID_PARAMETER If Start or Length describe an address not in the Legacy Region.\r
\r
**/\r
typedef\r
EFI_STATUS\r
(EFIAPI *EFI_LEGACY_REGION2_UNLOCK)(\r
  IN  EFI_LEGACY_REGION2_PROTOCOL  *This,\r
  IN  UINT32                       Start,\r
  IN  UINT32                       Length,\r
  OUT UINT32                       *Granularity\r
  );\r
\r
typedef enum {\r
  LegacyRegionDecoded,         ///< This region is currently set to allow reads.\r
  LegacyRegionNotDecoded,      ///< This region is currently set to not allow reads.\r
  LegacyRegionWriteEnabled,    ///< This region is currently set to allow writes.\r
  LegacyRegionWriteDisabled,   ///< This region is currently set to write protected.\r
  LegacyRegionBootLocked,      ///< This region's attributes are locked, cannot be modified until\r
                               ///< after a power cycle.\r
  LegacyRegionNotLocked        ///< This region's attributes are not locked.\r
} EFI_LEGACY_REGION_ATTRIBUTE;\r
\r
typedef struct {\r
  ///\r
  /// The beginning of the physical address of this\r
  /// region.\r
  ///\r
  UINT32                         Start;\r
  ///\r
  /// The number of bytes in this region.\r
  ///\r
  UINT32                         Length;\r
  ///\r
  /// Attribute of the Legacy Region Descriptor that\r
  /// describes the capabilities for that memory region.\r
  ///\r
  EFI_LEGACY_REGION_ATTRIBUTE    Attribute;\r
  ///\r
  /// Describes the byte length programmability\r
  /// associated with the Start address and the specified\r
  /// Attribute setting.\r
  UINT32                         Granularity;\r
} EFI_LEGACY_REGION_DESCRIPTOR;\r
\r
/**\r
  Get region information for the attributes of the Legacy Region.\r
\r
  This function is used to discover the granularity of the attributes for the memory in the legacy\r
  region. Each attribute may have a different granularity and the granularity may not be the same\r
  for all memory ranges in the legacy region.\r
\r
  @param  This[in]              Indicates the EFI_LEGACY_REGION2_PROTOCOL instance.\r
  @param  DescriptorCount[out]  The number of region descriptor entries returned in the Descriptor\r
                                buffer.\r
  @param  Descriptor[out]       A pointer to a pointer used to return a buffer where the legacy\r
                                region information is deposited. This buffer will contain a list of\r
                                DescriptorCount number of region descriptors.  This function will\r
                                provide the memory for the buffer.\r
\r
  @retval EFI_SUCCESS           The information structure was returned.\r
  @retval EFI_UNSUPPORTED       This function is not supported.\r
\r
**/\r
typedef\r
EFI_STATUS\r
(EFIAPI *EFI_LEGACY_REGION_GET_INFO)(\r
  IN  EFI_LEGACY_REGION2_PROTOCOL   *This,\r
  OUT UINT32                        *DescriptorCount,\r
  OUT EFI_LEGACY_REGION_DESCRIPTOR  **Descriptor\r
  );\r
\r
///\r
/// The EFI_LEGACY_REGION2_PROTOCOL is used to abstract the hardware control of the memory\r
/// attributes of the Option ROM shadowing region, 0xC0000 to 0xFFFFF.\r
/// There are three memory attributes that can be modified through this protocol: read, write and\r
/// boot-lock. These protocols may be set in any combination.\r
///\r
struct _EFI_LEGACY_REGION2_PROTOCOL {\r
  EFI_LEGACY_REGION2_DECODE       Decode;\r
  EFI_LEGACY_REGION2_LOCK         Lock;\r
  EFI_LEGACY_REGION2_BOOT_LOCK    BootLock;\r
  EFI_LEGACY_REGION2_UNLOCK       UnLock;\r
  EFI_LEGACY_REGION_GET_INFO      GetInfo;\r
};\r
\r
extern EFI_GUID  gEfiLegacyRegion2ProtocolGuid;\r
\r
#endif\r
Commit	Line	Data
	1	/** @file\r
	2	The Legacy Region Protocol controls the read, write and boot-lock attributes for\r
	3	the region 0xC0000 to 0xFFFFF.\r
	4	\r
	5	Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>\r
	6	SPDX-License-Identifier: BSD-2-Clause-Patent\r
	7	\r
	8	@par Revision Reference:\r
	9	This Protocol is defined in UEFI Platform Initialization Specification 1.2\r
	10	Volume 5: Standards\r
	11	\r
	12	**/\r
	13	\r
	14	#ifndef __LEGACY_REGION2_H__\r
	15	#define __LEGACY_REGION2_H__\r
	16	\r
	17	#define EFI_LEGACY_REGION2_PROTOCOL_GUID \\r
	18	{ \\r
	19	0x70101eaf, 0x85, 0x440c, {0xb3, 0x56, 0x8e, 0xe3, 0x6f, 0xef, 0x24, 0xf0 } \\r
	20	}\r
	21	\r
	22	typedef struct _EFI_LEGACY_REGION2_PROTOCOL EFI_LEGACY_REGION2_PROTOCOL;\r
	23	\r
	24	/**\r
	25	Modify the hardware to allow (decode) or disallow (not decode) memory reads in a region.\r
	26	\r
	27	If the On parameter evaluates to TRUE, this function enables memory reads in the address range\r
	28	Start to (Start + Length - 1).\r
	29	If the On parameter evaluates to FALSE, this function disables memory reads in the address range\r
	30	Start to (Start + Length - 1).\r
	31	\r
	32	@param This[in] Indicates the EFI_LEGACY_REGION2_PROTOCOL instance.\r
	33	@param Start[in] The beginning of the physical address of the region whose attributes\r
	34	should be modified.\r
	35	@param Length[in] The number of bytes of memory whose attributes should be modified.\r
	36	The actual number of bytes modified may be greater than the number\r
	37	specified.\r
	38	@param Granularity[out] The number of bytes in the last region affected. This may be less\r
	39	than the total number of bytes affected if the starting address\r
	40	was not aligned to a region's starting address or if the length\r
	41	was greater than the number of bytes in the first region.\r
	42	@param On[in] Decode / Non-Decode flag.\r
	43	\r
	44	@retval EFI_SUCCESS The region's attributes were successfully modified.\r
	45	@retval EFI_INVALID_PARAMETER If Start or Length describe an address not in the Legacy Region.\r
	46	\r
	47	**/\r
	48	typedef\r
	49	EFI_STATUS\r
	50	(EFIAPI *EFI_LEGACY_REGION2_DECODE)(\r
	51	IN EFI_LEGACY_REGION2_PROTOCOL *This,\r
	52	IN UINT32 Start,\r
	53	IN UINT32 Length,\r
	54	OUT UINT32 *Granularity,\r
	55	IN BOOLEAN *On\r
	56	);\r
	57	\r
	58	/**\r
	59	Modify the hardware to disallow memory writes in a region.\r
	60	\r
	61	This function changes the attributes of a memory range to not allow writes.\r
	62	\r
	63	@param This[in] Indicates the EFI_LEGACY_REGION2_PROTOCOL instance.\r
	64	@param Start[in] The beginning of the physical address of the region whose\r
	65	attributes should be modified.\r
	66	@param Length[in] The number of bytes of memory whose attributes should be modified.\r
	67	The actual number of bytes modified may be greater than the number\r
	68	specified.\r
	69	@param Granularity[out] The number of bytes in the last region affected. This may be less\r
	70	than the total number of bytes affected if the starting address was\r
	71	not aligned to a region's starting address or if the length was\r
	72	greater than the number of bytes in the first region.\r
	73	\r
	74	@retval EFI_SUCCESS The region's attributes were successfully modified.\r
	75	@retval EFI_INVALID_PARAMETER If Start or Length describe an address not in the Legacy Region.\r
	76	\r
	77	**/\r
	78	typedef\r
	79	EFI_STATUS\r
	80	(EFIAPI *EFI_LEGACY_REGION2_LOCK)(\r
	81	IN EFI_LEGACY_REGION2_PROTOCOL *This,\r
	82	IN UINT32 Start,\r
	83	IN UINT32 Length,\r
	84	OUT UINT32 *Granularity\r
	85	);\r
	86	\r
	87	/**\r
	88	Modify the hardware to disallow memory attribute changes in a region.\r
	89	\r
	90	This function makes the attributes of a region read only. Once a region is boot-locked with this\r
	91	function, the read and write attributes of that region cannot be changed until a power cycle has\r
	92	reset the boot-lock attribute. Calls to Decode(), Lock() and Unlock() will have no effect.\r
	93	\r
	94	@param This[in] Indicates the EFI_LEGACY_REGION2_PROTOCOL instance.\r
	95	@param Start[in] The beginning of the physical address of the region whose\r
	96	attributes should be modified.\r
	97	@param Length[in] The number of bytes of memory whose attributes should be modified.\r
	98	The actual number of bytes modified may be greater than the number\r
	99	specified.\r
	100	@param Granularity[out] The number of bytes in the last region affected. This may be less\r
	101	than the total number of bytes affected if the starting address was\r
	102	not aligned to a region's starting address or if the length was\r
	103	greater than the number of bytes in the first region.\r
	104	\r
	105	@retval EFI_SUCCESS The region's attributes were successfully modified.\r
	106	@retval EFI_INVALID_PARAMETER If Start or Length describe an address not in the Legacy Region.\r
	107	@retval EFI_UNSUPPORTED The chipset does not support locking the configuration registers in\r
	108	a way that will not affect memory regions outside the legacy memory\r
	109	region.\r
	110	\r
	111	**/\r
	112	typedef\r
	113	EFI_STATUS\r
	114	(EFIAPI *EFI_LEGACY_REGION2_BOOT_LOCK)(\r
	115	IN EFI_LEGACY_REGION2_PROTOCOL *This,\r
	116	IN UINT32 Start,\r
	117	IN UINT32 Length,\r
	118	OUT UINT32 *Granularity OPTIONAL\r
	119	);\r
	120	\r
	121	/**\r
	122	Modify the hardware to allow memory writes in a region.\r
	123	\r
	124	This function changes the attributes of a memory range to allow writes.\r
	125	\r
	126	@param This[in] Indicates the EFI_LEGACY_REGION2_PROTOCOL instance.\r
	127	@param Start[in] The beginning of the physical address of the region whose\r
	128	attributes should be modified.\r
	129	@param Length[in] The number of bytes of memory whose attributes should be modified.\r
	130	The actual number of bytes modified may be greater than the number\r
	131	specified.\r
	132	@param Granularity[out] The number of bytes in the last region affected. This may be less\r
	133	than the total number of bytes affected if the starting address was\r
	134	not aligned to a region's starting address or if the length was\r
	135	greater than the number of bytes in the first region.\r
	136	\r
	137	@retval EFI_SUCCESS The region's attributes were successfully modified.\r
	138	@retval EFI_INVALID_PARAMETER If Start or Length describe an address not in the Legacy Region.\r
	139	\r
	140	**/\r
	141	typedef\r
	142	EFI_STATUS\r
	143	(EFIAPI *EFI_LEGACY_REGION2_UNLOCK)(\r
	144	IN EFI_LEGACY_REGION2_PROTOCOL *This,\r
	145	IN UINT32 Start,\r
	146	IN UINT32 Length,\r
	147	OUT UINT32 *Granularity\r
	148	);\r
	149	\r
	150	typedef enum {\r
	151	LegacyRegionDecoded, ///< This region is currently set to allow reads.\r
	152	LegacyRegionNotDecoded, ///< This region is currently set to not allow reads.\r
	153	LegacyRegionWriteEnabled, ///< This region is currently set to allow writes.\r
	154	LegacyRegionWriteDisabled, ///< This region is currently set to write protected.\r
	155	LegacyRegionBootLocked, ///< This region's attributes are locked, cannot be modified until\r
	156	///< after a power cycle.\r
	157	LegacyRegionNotLocked ///< This region's attributes are not locked.\r
	158	} EFI_LEGACY_REGION_ATTRIBUTE;\r
	159	\r
	160	typedef struct {\r
	161	///\r
	162	/// The beginning of the physical address of this\r
	163	/// region.\r
	164	///\r
	165	UINT32 Start;\r
	166	///\r
	167	/// The number of bytes in this region.\r
	168	///\r
	169	UINT32 Length;\r
	170	///\r
	171	/// Attribute of the Legacy Region Descriptor that\r
	172	/// describes the capabilities for that memory region.\r
	173	///\r
	174	EFI_LEGACY_REGION_ATTRIBUTE Attribute;\r
	175	///\r
	176	/// Describes the byte length programmability\r
	177	/// associated with the Start address and the specified\r
	178	/// Attribute setting.\r
	179	UINT32 Granularity;\r
	180	} EFI_LEGACY_REGION_DESCRIPTOR;\r
	181	\r
	182	/**\r
	183	Get region information for the attributes of the Legacy Region.\r
	184	\r
	185	This function is used to discover the granularity of the attributes for the memory in the legacy\r
	186	region. Each attribute may have a different granularity and the granularity may not be the same\r
	187	for all memory ranges in the legacy region.\r
	188	\r
	189	@param This[in] Indicates the EFI_LEGACY_REGION2_PROTOCOL instance.\r
	190	@param DescriptorCount[out] The number of region descriptor entries returned in the Descriptor\r
	191	buffer.\r
	192	@param Descriptor[out] A pointer to a pointer used to return a buffer where the legacy\r
	193	region information is deposited. This buffer will contain a list of\r
	194	DescriptorCount number of region descriptors. This function will\r
	195	provide the memory for the buffer.\r
	196	\r
	197	@retval EFI_SUCCESS The information structure was returned.\r
	198	@retval EFI_UNSUPPORTED This function is not supported.\r
	199	\r
	200	**/\r
	201	typedef\r
	202	EFI_STATUS\r
	203	(EFIAPI *EFI_LEGACY_REGION_GET_INFO)(\r
	204	IN EFI_LEGACY_REGION2_PROTOCOL *This,\r
	205	OUT UINT32 *DescriptorCount,\r
	206	OUT EFI_LEGACY_REGION_DESCRIPTOR **Descriptor\r
	207	);\r
	208	\r
	209	///\r
	210	/// The EFI_LEGACY_REGION2_PROTOCOL is used to abstract the hardware control of the memory\r
	211	/// attributes of the Option ROM shadowing region, 0xC0000 to 0xFFFFF.\r
	212	/// There are three memory attributes that can be modified through this protocol: read, write and\r
	213	/// boot-lock. These protocols may be set in any combination.\r
	214	///\r
	215	struct _EFI_LEGACY_REGION2_PROTOCOL {\r
	216	EFI_LEGACY_REGION2_DECODE Decode;\r
	217	EFI_LEGACY_REGION2_LOCK Lock;\r
	218	EFI_LEGACY_REGION2_BOOT_LOCK BootLock;\r
	219	EFI_LEGACY_REGION2_UNLOCK UnLock;\r
	220	EFI_LEGACY_REGION_GET_INFO GetInfo;\r
	221	};\r
	222	\r
	223	extern EFI_GUID gEfiLegacyRegion2ProtocolGuid;\r
	224	\r
	225	#endif\r