[edk2] [PATCH v4 2/7] MdeModulePkg/SmmMemoryAttribute.h: Add new protocol definitions

Jian J Wang posted 7 patches 7 years, 1 month ago
There is a newer version of this series
[edk2] [PATCH v4 2/7] MdeModulePkg/SmmMemoryAttribute.h: Add new protocol definitions
Posted by Jian J Wang 7 years, 1 month ago
The new protocol gEdkiiSmmMemoryAttributeProtocolGuid is intended for
PiSmmCore to be able to change memory page attributes for the sake of
heap guard feature.

This protocol provides three interfaces to get/set/clear page attribute.

struct _EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL {
  EDKII_SMM_GET_MEMORY_ATTRIBUTES       GetMemoryAttributes;
  EDKII_SMM_SET_MEMORY_ATTRIBUTES       SetMemoryAttributes;
  EDKII_SMM_CLEAR_MEMORY_ATTRIBUTES     ClearMemoryAttributes;
};

Cc: Star Zeng <star.zeng@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Suggested-by: Ayellet Wolman <ayellet.wolman@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jian J Wang <jian.j.wang@intel.com>
---
 MdeModulePkg/Include/Protocol/SmmMemoryAttribute.h | 136 +++++++++++++++++++++
 1 file changed, 136 insertions(+)
 create mode 100644 MdeModulePkg/Include/Protocol/SmmMemoryAttribute.h

diff --git a/MdeModulePkg/Include/Protocol/SmmMemoryAttribute.h b/MdeModulePkg/Include/Protocol/SmmMemoryAttribute.h
new file mode 100644
index 0000000000..20e145c2dc
--- /dev/null
+++ b/MdeModulePkg/Include/Protocol/SmmMemoryAttribute.h
@@ -0,0 +1,136 @@
+/** @file
+  EFI SMM Memory Attribute Protocol provides retrieval and update service
+  for memory attributes in EFI SMM environment.
+
+  Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#ifndef __SMM_MEMORYATTRIBUTE_H__
+#define __SMM_MEMORYATTRIBUTE_H__
+
+//{69B792EA-39CE-402D-A2A6-F721DE351DFE}
+#define EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL_GUID \
+  { \
+    0x69b792ea, 0x39ce, 0x402d, { 0xa2, 0xa6, 0xf7, 0x21, 0xde, 0x35, 0x1d, 0xfe } \
+  }
+
+typedef struct _EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL;
+
+/**
+  This function set given attributes of the memory region specified by
+  BaseAddress and Length.
+
+  @param  This              The EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL instance.
+  @param  BaseAddress       The physical address that is the start address of
+                            a memory region.
+  @param  Length            The size in bytes of the memory region.
+  @param  Attributes        The bit mask of attributes to set for the memory
+                            region.
+
+  @retval EFI_SUCCESS           The attributes were set for the memory region.
+  @retval EFI_INVALID_PARAMETER Length is zero.
+                                Attributes specified an illegal combination of
+                                attributes that cannot be set together.
+  @retval EFI_UNSUPPORTED       The processor does not support one or more
+                                bytes of the memory resource range specified
+                                by BaseAddress and Length.
+                                The bit mask of attributes is not support for
+                                the memory resource range specified by
+                                BaseAddress and Length.
+
+**/
+typedef
+EFI_STATUS
+(EFIAPI *EDKII_SMM_SET_MEMORY_ATTRIBUTES)(
+  IN  EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL *This,
+  IN  EFI_PHYSICAL_ADDRESS                BaseAddress,
+  IN  UINT64                              Length,
+  IN  UINT64                              Attributes
+  );
+
+/**
+  This function clears given attributes of the memory region specified by
+  BaseAddress and Length.
+
+  @param  This              The EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL instance.
+  @param  BaseAddress       The physical address that is the start address of
+                            a memory region.
+  @param  Length            The size in bytes of the memory region.
+  @param  Attributes        The bit mask of attributes to set for the memory
+                            region.
+
+  @retval EFI_SUCCESS           The attributes were set for the memory region.
+  @retval EFI_INVALID_PARAMETER Length is zero.
+                                Attributes specified an illegal combination of
+                                attributes that cannot be set together.
+  @retval EFI_UNSUPPORTED       The processor does not support one or more
+                                bytes of the memory resource range specified
+                                by BaseAddress and Length.
+                                The bit mask of attributes is not support for
+                                the memory resource range specified by
+                                BaseAddress and Length.
+
+**/
+typedef
+EFI_STATUS
+(EFIAPI *EDKII_SMM_CLEAR_MEMORY_ATTRIBUTES)(
+  IN  EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL *This,
+  IN  EFI_PHYSICAL_ADDRESS                BaseAddress,
+  IN  UINT64                              Length,
+  IN  UINT64                              Attributes
+  );
+
+/**
+  This function retrieve the attributes of the memory region specified by
+  BaseAddress and Length. If different attributes are got from different part
+  of the memory region, EFI_NO_MAPPING will be returned.
+
+  @param  This              The EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL instance.
+  @param  BaseAddress       The physical address that is the start address of
+                            a memory region.
+  @param  Length            The size in bytes of the memory region.
+  @param  Attributes        Pointer to attributes returned.
+
+  @retval EFI_SUCCESS           The attributes got for the memory region.
+  @retval EFI_INVALID_PARAMETER Length is zero.
+                                Attributes is NULL.
+  @retval EFI_NO_MAPPING        Attributes are not consistent cross the memory
+                                region.
+  @retval EFI_UNSUPPORTED       The processor does not support one or more
+                                bytes of the memory resource range specified
+                                by BaseAddress and Length.
+                                The bit mask of attributes is not support for
+                                the memory resource range specified by
+                                BaseAddress and Length.
+
+**/
+typedef
+EFI_STATUS
+(EFIAPI *EDKII_SMM_GET_MEMORY_ATTRIBUTES)(
+  IN  EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL *This,
+  IN  EFI_PHYSICAL_ADDRESS                BaseAddress,
+  IN  UINT64                              Length,
+  IN  UINT64                              *Attributes
+  );
+
+///
+/// EFI SMM Memory Attribute Protocol provides services to retrieve or update
+/// memory attribute in the EFI SMM environment.
+///
+struct _EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL {
+  EDKII_SMM_GET_MEMORY_ATTRIBUTES       GetMemoryAttributes;
+  EDKII_SMM_SET_MEMORY_ATTRIBUTES       SetMemoryAttributes;
+  EDKII_SMM_CLEAR_MEMORY_ATTRIBUTES     ClearMemoryAttributes;
+};
+
+extern EFI_GUID gEdkiiSmmMemoryAttributeProtocolGuid;
+
+#endif
-- 
2.14.1.windows.1

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Re: [edk2] [PATCH v4 2/7] MdeModulePkg/SmmMemoryAttribute.h: Add new protocol definitions
Posted by Zeng, Star 7 years, 1 month ago
Suggest to use " SMM Memory Attribute Protocol " instead of " EFI SMM Memory Attribute Protocol " in the comments.

Should "+  IN  UINT64                              *Attributes" be "+  OUT  UINT64                              *Attributes" for EDKII_SMM_GET_MEMORY_ATTRIBUTES?

Thanks,
Star
-----Original Message-----
From: Wang, Jian J 
Sent: Friday, October 27, 2017 2:12 PM
To: edk2-devel@lists.01.org
Cc: Zeng, Star <star.zeng@intel.com>; Dong, Eric <eric.dong@intel.com>; Yao, Jiewen <jiewen.yao@intel.com>; Ni, Ruiyu <ruiyu.ni@intel.com>
Subject: [PATCH v4 2/7] MdeModulePkg/SmmMemoryAttribute.h: Add new protocol definitions

The new protocol gEdkiiSmmMemoryAttributeProtocolGuid is intended for PiSmmCore to be able to change memory page attributes for the sake of heap guard feature.

This protocol provides three interfaces to get/set/clear page attribute.

struct _EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL {
  EDKII_SMM_GET_MEMORY_ATTRIBUTES       GetMemoryAttributes;
  EDKII_SMM_SET_MEMORY_ATTRIBUTES       SetMemoryAttributes;
  EDKII_SMM_CLEAR_MEMORY_ATTRIBUTES     ClearMemoryAttributes;
};

Cc: Star Zeng <star.zeng@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Suggested-by: Ayellet Wolman <ayellet.wolman@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jian J Wang <jian.j.wang@intel.com>
---
 MdeModulePkg/Include/Protocol/SmmMemoryAttribute.h | 136 +++++++++++++++++++++
 1 file changed, 136 insertions(+)
 create mode 100644 MdeModulePkg/Include/Protocol/SmmMemoryAttribute.h

diff --git a/MdeModulePkg/Include/Protocol/SmmMemoryAttribute.h b/MdeModulePkg/Include/Protocol/SmmMemoryAttribute.h
new file mode 100644
index 0000000000..20e145c2dc
--- /dev/null
+++ b/MdeModulePkg/Include/Protocol/SmmMemoryAttribute.h
@@ -0,0 +1,136 @@
+/** @file
+  EFI SMM Memory Attribute Protocol provides retrieval and update 
+service
+  for memory attributes in EFI SMM environment.
+
+  Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>  This 
+ program and the accompanying materials  are licensed and made 
+ available under the terms and conditions of the BSD License  which 
+ accompanies this distribution.  The full text of the license may be 
+ found at  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,  
+ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#ifndef __SMM_MEMORYATTRIBUTE_H__
+#define __SMM_MEMORYATTRIBUTE_H__
+
+//{69B792EA-39CE-402D-A2A6-F721DE351DFE}
+#define EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL_GUID \
+  { \
+    0x69b792ea, 0x39ce, 0x402d, { 0xa2, 0xa6, 0xf7, 0x21, 0xde, 0x35, 
+0x1d, 0xfe } \
+  }
+
+typedef struct _EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL 
+EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL;
+
+/**
+  This function set given attributes of the memory region specified by
+  BaseAddress and Length.
+
+  @param  This              The EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL instance.
+  @param  BaseAddress       The physical address that is the start address of
+                            a memory region.
+  @param  Length            The size in bytes of the memory region.
+  @param  Attributes        The bit mask of attributes to set for the memory
+                            region.
+
+  @retval EFI_SUCCESS           The attributes were set for the memory region.
+  @retval EFI_INVALID_PARAMETER Length is zero.
+                                Attributes specified an illegal combination of
+                                attributes that cannot be set together.
+  @retval EFI_UNSUPPORTED       The processor does not support one or more
+                                bytes of the memory resource range specified
+                                by BaseAddress and Length.
+                                The bit mask of attributes is not support for
+                                the memory resource range specified by
+                                BaseAddress and Length.
+
+**/
+typedef
+EFI_STATUS
+(EFIAPI *EDKII_SMM_SET_MEMORY_ATTRIBUTES)(
+  IN  EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL *This,
+  IN  EFI_PHYSICAL_ADDRESS                BaseAddress,
+  IN  UINT64                              Length,
+  IN  UINT64                              Attributes
+  );
+
+/**
+  This function clears given attributes of the memory region specified 
+by
+  BaseAddress and Length.
+
+  @param  This              The EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL instance.
+  @param  BaseAddress       The physical address that is the start address of
+                            a memory region.
+  @param  Length            The size in bytes of the memory region.
+  @param  Attributes        The bit mask of attributes to set for the memory
+                            region.
+
+  @retval EFI_SUCCESS           The attributes were set for the memory region.
+  @retval EFI_INVALID_PARAMETER Length is zero.
+                                Attributes specified an illegal combination of
+                                attributes that cannot be set together.
+  @retval EFI_UNSUPPORTED       The processor does not support one or more
+                                bytes of the memory resource range specified
+                                by BaseAddress and Length.
+                                The bit mask of attributes is not support for
+                                the memory resource range specified by
+                                BaseAddress and Length.
+
+**/
+typedef
+EFI_STATUS
+(EFIAPI *EDKII_SMM_CLEAR_MEMORY_ATTRIBUTES)(
+  IN  EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL *This,
+  IN  EFI_PHYSICAL_ADDRESS                BaseAddress,
+  IN  UINT64                              Length,
+  IN  UINT64                              Attributes
+  );
+
+/**
+  This function retrieve the attributes of the memory region specified 
+by
+  BaseAddress and Length. If different attributes are got from 
+different part
+  of the memory region, EFI_NO_MAPPING will be returned.
+
+  @param  This              The EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL instance.
+  @param  BaseAddress       The physical address that is the start address of
+                            a memory region.
+  @param  Length            The size in bytes of the memory region.
+  @param  Attributes        Pointer to attributes returned.
+
+  @retval EFI_SUCCESS           The attributes got for the memory region.
+  @retval EFI_INVALID_PARAMETER Length is zero.
+                                Attributes is NULL.
+  @retval EFI_NO_MAPPING        Attributes are not consistent cross the memory
+                                region.
+  @retval EFI_UNSUPPORTED       The processor does not support one or more
+                                bytes of the memory resource range specified
+                                by BaseAddress and Length.
+                                The bit mask of attributes is not support for
+                                the memory resource range specified by
+                                BaseAddress and Length.
+
+**/
+typedef
+EFI_STATUS
+(EFIAPI *EDKII_SMM_GET_MEMORY_ATTRIBUTES)(
+  IN  EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL *This,
+  IN  EFI_PHYSICAL_ADDRESS                BaseAddress,
+  IN  UINT64                              Length,
+  IN  UINT64                              *Attributes
+  );
+
+///
+/// EFI SMM Memory Attribute Protocol provides services to retrieve or 
+update /// memory attribute in the EFI SMM environment.
+///
+struct _EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL {
+  EDKII_SMM_GET_MEMORY_ATTRIBUTES       GetMemoryAttributes;
+  EDKII_SMM_SET_MEMORY_ATTRIBUTES       SetMemoryAttributes;
+  EDKII_SMM_CLEAR_MEMORY_ATTRIBUTES     ClearMemoryAttributes;
+};
+
+extern EFI_GUID gEdkiiSmmMemoryAttributeProtocolGuid;
+
+#endif
--
2.14.1.windows.1

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Re: [edk2] [PATCH v4 2/7] MdeModulePkg/SmmMemoryAttribute.h: Add new protocol definitions
Posted by Wang, Jian J 7 years, 1 month ago
Good catch. "EFI" should be removed and "IN" should be "OUT". Thanks for the feedback.

> -----Original Message-----
> From: Zeng, Star
> Sent: Thursday, November 09, 2017 1:13 PM
> To: Wang, Jian J <jian.j.wang@intel.com>; edk2-devel@lists.01.org
> Cc: Dong, Eric <eric.dong@intel.com>; Yao, Jiewen <jiewen.yao@intel.com>; Ni,
> Ruiyu <ruiyu.ni@intel.com>; Zeng, Star <star.zeng@intel.com>
> Subject: RE: [PATCH v4 2/7] MdeModulePkg/SmmMemoryAttribute.h: Add new
> protocol definitions
> 
> Suggest to use " SMM Memory Attribute Protocol " instead of " EFI SMM
> Memory Attribute Protocol " in the comments.
> 
> Should "+  IN  UINT64                              *Attributes" be "+  OUT  UINT64
> *Attributes" for EDKII_SMM_GET_MEMORY_ATTRIBUTES?
> 
> Thanks,
> Star
> -----Original Message-----
> From: Wang, Jian J
> Sent: Friday, October 27, 2017 2:12 PM
> To: edk2-devel@lists.01.org
> Cc: Zeng, Star <star.zeng@intel.com>; Dong, Eric <eric.dong@intel.com>; Yao,
> Jiewen <jiewen.yao@intel.com>; Ni, Ruiyu <ruiyu.ni@intel.com>
> Subject: [PATCH v4 2/7] MdeModulePkg/SmmMemoryAttribute.h: Add new
> protocol definitions
> 
> The new protocol gEdkiiSmmMemoryAttributeProtocolGuid is intended for
> PiSmmCore to be able to change memory page attributes for the sake of heap
> guard feature.
> 
> This protocol provides three interfaces to get/set/clear page attribute.
> 
> struct _EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL {
>   EDKII_SMM_GET_MEMORY_ATTRIBUTES       GetMemoryAttributes;
>   EDKII_SMM_SET_MEMORY_ATTRIBUTES       SetMemoryAttributes;
>   EDKII_SMM_CLEAR_MEMORY_ATTRIBUTES     ClearMemoryAttributes;
> };
> 
> Cc: Star Zeng <star.zeng@intel.com>
> Cc: Eric Dong <eric.dong@intel.com>
> Cc: Jiewen Yao <jiewen.yao@intel.com>
> Cc: Ruiyu Ni <ruiyu.ni@intel.com>
> Suggested-by: Ayellet Wolman <ayellet.wolman@intel.com>
> Contributed-under: TianoCore Contribution Agreement 1.1
> Signed-off-by: Jian J Wang <jian.j.wang@intel.com>
> ---
>  MdeModulePkg/Include/Protocol/SmmMemoryAttribute.h | 136
> +++++++++++++++++++++
>  1 file changed, 136 insertions(+)
>  create mode 100644 MdeModulePkg/Include/Protocol/SmmMemoryAttribute.h
> 
> diff --git a/MdeModulePkg/Include/Protocol/SmmMemoryAttribute.h
> b/MdeModulePkg/Include/Protocol/SmmMemoryAttribute.h
> new file mode 100644
> index 0000000000..20e145c2dc
> --- /dev/null
> +++ b/MdeModulePkg/Include/Protocol/SmmMemoryAttribute.h
> @@ -0,0 +1,136 @@
> +/** @file
> +  EFI SMM Memory Attribute Protocol provides retrieval and update
> +service
> +  for memory attributes in EFI SMM environment.
> +
> +  Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>  This
> + program and the accompanying materials  are licensed and made
> + available under the terms and conditions of the BSD License  which
> + accompanies this distribution.  The full text of the license may be
> + found at  http://opensource.org/licenses/bsd-license.php
> +
> +  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
> + WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER
> EXPRESS OR IMPLIED.
> +
> +**/
> +
> +#ifndef __SMM_MEMORYATTRIBUTE_H__
> +#define __SMM_MEMORYATTRIBUTE_H__
> +
> +//{69B792EA-39CE-402D-A2A6-F721DE351DFE}
> +#define EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL_GUID \
> +  { \
> +    0x69b792ea, 0x39ce, 0x402d, { 0xa2, 0xa6, 0xf7, 0x21, 0xde, 0x35,
> +0x1d, 0xfe } \
> +  }
> +
> +typedef struct _EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL
> +EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL;
> +
> +/**
> +  This function set given attributes of the memory region specified by
> +  BaseAddress and Length.
> +
> +  @param  This              The EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL
> instance.
> +  @param  BaseAddress       The physical address that is the start address of
> +                            a memory region.
> +  @param  Length            The size in bytes of the memory region.
> +  @param  Attributes        The bit mask of attributes to set for the memory
> +                            region.
> +
> +  @retval EFI_SUCCESS           The attributes were set for the memory region.
> +  @retval EFI_INVALID_PARAMETER Length is zero.
> +                                Attributes specified an illegal combination of
> +                                attributes that cannot be set together.
> +  @retval EFI_UNSUPPORTED       The processor does not support one or more
> +                                bytes of the memory resource range specified
> +                                by BaseAddress and Length.
> +                                The bit mask of attributes is not support for
> +                                the memory resource range specified by
> +                                BaseAddress and Length.
> +
> +**/
> +typedef
> +EFI_STATUS
> +(EFIAPI *EDKII_SMM_SET_MEMORY_ATTRIBUTES)(
> +  IN  EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL *This,
> +  IN  EFI_PHYSICAL_ADDRESS                BaseAddress,
> +  IN  UINT64                              Length,
> +  IN  UINT64                              Attributes
> +  );
> +
> +/**
> +  This function clears given attributes of the memory region specified
> +by
> +  BaseAddress and Length.
> +
> +  @param  This              The EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL
> instance.
> +  @param  BaseAddress       The physical address that is the start address of
> +                            a memory region.
> +  @param  Length            The size in bytes of the memory region.
> +  @param  Attributes        The bit mask of attributes to set for the memory
> +                            region.
> +
> +  @retval EFI_SUCCESS           The attributes were set for the memory region.
> +  @retval EFI_INVALID_PARAMETER Length is zero.
> +                                Attributes specified an illegal combination of
> +                                attributes that cannot be set together.
> +  @retval EFI_UNSUPPORTED       The processor does not support one or more
> +                                bytes of the memory resource range specified
> +                                by BaseAddress and Length.
> +                                The bit mask of attributes is not support for
> +                                the memory resource range specified by
> +                                BaseAddress and Length.
> +
> +**/
> +typedef
> +EFI_STATUS
> +(EFIAPI *EDKII_SMM_CLEAR_MEMORY_ATTRIBUTES)(
> +  IN  EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL *This,
> +  IN  EFI_PHYSICAL_ADDRESS                BaseAddress,
> +  IN  UINT64                              Length,
> +  IN  UINT64                              Attributes
> +  );
> +
> +/**
> +  This function retrieve the attributes of the memory region specified
> +by
> +  BaseAddress and Length. If different attributes are got from
> +different part
> +  of the memory region, EFI_NO_MAPPING will be returned.
> +
> +  @param  This              The EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL
> instance.
> +  @param  BaseAddress       The physical address that is the start address of
> +                            a memory region.
> +  @param  Length            The size in bytes of the memory region.
> +  @param  Attributes        Pointer to attributes returned.
> +
> +  @retval EFI_SUCCESS           The attributes got for the memory region.
> +  @retval EFI_INVALID_PARAMETER Length is zero.
> +                                Attributes is NULL.
> +  @retval EFI_NO_MAPPING        Attributes are not consistent cross the
> memory
> +                                region.
> +  @retval EFI_UNSUPPORTED       The processor does not support one or more
> +                                bytes of the memory resource range specified
> +                                by BaseAddress and Length.
> +                                The bit mask of attributes is not support for
> +                                the memory resource range specified by
> +                                BaseAddress and Length.
> +
> +**/
> +typedef
> +EFI_STATUS
> +(EFIAPI *EDKII_SMM_GET_MEMORY_ATTRIBUTES)(
> +  IN  EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL *This,
> +  IN  EFI_PHYSICAL_ADDRESS                BaseAddress,
> +  IN  UINT64                              Length,
> +  IN  UINT64                              *Attributes
> +  );
> +
> +///
> +/// EFI SMM Memory Attribute Protocol provides services to retrieve or
> +update /// memory attribute in the EFI SMM environment.
> +///
> +struct _EDKII_SMM_MEMORY_ATTRIBUTE_PROTOCOL {
> +  EDKII_SMM_GET_MEMORY_ATTRIBUTES       GetMemoryAttributes;
> +  EDKII_SMM_SET_MEMORY_ATTRIBUTES       SetMemoryAttributes;
> +  EDKII_SMM_CLEAR_MEMORY_ATTRIBUTES     ClearMemoryAttributes;
> +};
> +
> +extern EFI_GUID gEdkiiSmmMemoryAttributeProtocolGuid;
> +
> +#endif
> --
> 2.14.1.windows.1

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