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authorBret Barkelew <brbarkel@microsoft.com>2020-11-09 14:45:12 +0800
committermergify[bot] <37929162+mergify[bot]@users.noreply.github.com>2020-11-17 01:03:43 +0000
commitb6104becb9455b44800d17e06b509864d7788fc3 (patch)
tree0f8ac291215d441614a51375a2868e4f28a4b351 /MdeModulePkg/Include
parent355b181f74050cdf2f09b1755c1a5ee4affb1faf (diff)
downloadedk2-b6104becb9455b44800d17e06b509864d7788fc3.tar.gz
MdeModulePkg: Define the VariablePolicyHelperLib
https://bugzilla.tianocore.org/show_bug.cgi?id=2522 VariablePolicy is an updated interface to replace VarLock and VarCheckProtocol. Add the VariablePolicyHelperLib library, containing several functions to help with the repetitive process of creating a correctly structured and packed VariablePolicy entry. Cc: Jian J Wang <jian.j.wang@intel.com> Cc: Hao A Wu <hao.a.wu@intel.com> Cc: Liming Gao <liming.gao@intel.com> Cc: Bret Barkelew <brbarkel@microsoft.com> Signed-off-by: Bret Barkelew <brbarkel@microsoft.com> Reviewed-by: Dandan Bi <dandan.bi@intel.com> Acked-by: Jian J Wang <jian.j.wang@intel.com>
Diffstat (limited to 'MdeModulePkg/Include')
-rw-r--r--MdeModulePkg/Include/Library/VariablePolicyHelperLib.h164
1 files changed, 164 insertions, 0 deletions
diff --git a/MdeModulePkg/Include/Library/VariablePolicyHelperLib.h b/MdeModulePkg/Include/Library/VariablePolicyHelperLib.h
new file mode 100644
index 0000000000..3b75e97860
--- /dev/null
+++ b/MdeModulePkg/Include/Library/VariablePolicyHelperLib.h
@@ -0,0 +1,164 @@
+/** @file -- VariablePolicyHelperLib.h
+This library contains helper functions for marshalling and registering
+new policies with the VariablePolicy infrastructure.
+
+Copyright (c) Microsoft Corporation.
+SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef _EDKII_VARIABLE_POLICY_HELPER_LIB_H_
+#define _EDKII_VARIABLE_POLICY_HELPER_LIB_H_
+
+#include <Protocol/VariablePolicy.h>
+
+/**
+ This helper function will allocate and populate a new VariablePolicy
+ structure for a policy that does not contain any sub-structures (such as
+ VARIABLE_LOCK_ON_VAR_STATE_POLICY).
+
+ NOTE: Caller will need to free structure once finished.
+
+ @param[in] Namespace Pointer to an EFI_GUID for the target variable namespace that this policy will protect.
+ @param[in] Name [Optional] If provided, a pointer to the CHAR16 array for the target variable name.
+ Otherwise, will create a policy that targets an entire namespace.
+ @param[in] MinSize MinSize for the VariablePolicy.
+ @param[in] MaxSize MaxSize for the VariablePolicy.
+ @param[in] AttributesMustHave AttributesMustHave for the VariablePolicy.
+ @param[in] AttributesCantHave AttributesCantHave for the VariablePolicy.
+ @param[in] LockPolicyType LockPolicyType for the VariablePolicy.
+ @param[out] NewEntry If successful, will be set to a pointer to the allocated buffer containing the
+ new policy.
+
+ @retval EFI_SUCCESS Operation completed successfully and structure is populated.
+ @retval EFI_INVALID_PARAMETER Namespace is NULL.
+ @retval EFI_INVALID_PARAMETER LockPolicyType is invalid for a basic structure.
+ @retval EFI_BUFFER_TOO_SMALL Finished structure would not fit in UINT16 size.
+ @retval EFI_OUT_OF_RESOURCES Could not allocate sufficient space for structure.
+
+**/
+EFI_STATUS
+EFIAPI
+CreateBasicVariablePolicy (
+ IN CONST EFI_GUID *Namespace,
+ IN CONST CHAR16 *Name OPTIONAL,
+ IN UINT32 MinSize,
+ IN UINT32 MaxSize,
+ IN UINT32 AttributesMustHave,
+ IN UINT32 AttributesCantHave,
+ IN UINT8 LockPolicyType,
+ OUT VARIABLE_POLICY_ENTRY **NewEntry
+ );
+
+
+/**
+ This helper function will allocate and populate a new VariablePolicy
+ structure for a policy with a lock type of VARIABLE_POLICY_TYPE_LOCK_ON_VAR_STATE.
+
+ NOTE: Caller will need to free structure once finished.
+
+ @param[in] Namespace Pointer to an EFI_GUID for the target variable namespace that this policy will protect.
+ @param[in] Name [Optional] If provided, a pointer to the CHAR16 array for the target variable name.
+ Otherwise, will create a policy that targets an entire namespace.
+ @param[in] MinSize MinSize for the VariablePolicy.
+ @param[in] MaxSize MaxSize for the VariablePolicy.
+ @param[in] AttributesMustHave AttributesMustHave for the VariablePolicy.
+ @param[in] AttributesCantHave AttributesCantHave for the VariablePolicy.
+ @param[in] VarStateNamespace Pointer to the EFI_GUID for the VARIABLE_LOCK_ON_VAR_STATE_POLICY.Namespace.
+ @param[in] VarStateValue Value for the VARIABLE_LOCK_ON_VAR_STATE_POLICY.Value.
+ @param[in] VarStateName Pointer to the CHAR16 array for the VARIABLE_LOCK_ON_VAR_STATE_POLICY.Name.
+ @param[out] NewEntry If successful, will be set to a pointer to the allocated buffer containing the
+ new policy.
+
+ @retval EFI_SUCCESS Operation completed successfully and structure is populated.
+ @retval EFI_INVALID_PARAMETER Namespace, VarStateNamespace, VarStateName is NULL.
+ @retval EFI_BUFFER_TOO_SMALL Finished structure would not fit in UINT16 size.
+ @retval EFI_OUT_OF_RESOURCES Could not allocate sufficient space for structure.
+
+**/
+EFI_STATUS
+EFIAPI
+CreateVarStateVariablePolicy (
+ IN CONST EFI_GUID *Namespace,
+ IN CONST CHAR16 *Name OPTIONAL,
+ IN UINT32 MinSize,
+ IN UINT32 MaxSize,
+ IN UINT32 AttributesMustHave,
+ IN UINT32 AttributesCantHave,
+ IN CONST EFI_GUID *VarStateNamespace,
+ IN UINT8 VarStateValue,
+ IN CONST CHAR16 *VarStateName,
+ OUT VARIABLE_POLICY_ENTRY **NewEntry
+ );
+
+
+/**
+ This helper function does everything that CreateBasicVariablePolicy() does, but also
+ uses the passed in protocol to register the policy with the infrastructure.
+ Does not return a buffer, does not require the caller to free anything.
+
+ @param[in] VariablePolicy Pointer to a valid instance of the VariablePolicy protocol.
+ @param[in] Namespace Pointer to an EFI_GUID for the target variable namespace that this policy will protect.
+ @param[in] Name [Optional] If provided, a pointer to the CHAR16 array for the target variable name.
+ Otherwise, will create a policy that targets an entire namespace.
+ @param[in] MinSize MinSize for the VariablePolicy.
+ @param[in] MaxSize MaxSize for the VariablePolicy.
+ @param[in] AttributesMustHave AttributesMustHave for the VariablePolicy.
+ @param[in] AttributesCantHave AttributesCantHave for the VariablePolicy.
+ @param[in] LockPolicyType LockPolicyType for the VariablePolicy.
+
+ @retval EFI_INVALID_PARAMETER VariablePolicy pointer is NULL.
+ @retval EFI_STATUS Status returned by CreateBasicVariablePolicy() or RegisterVariablePolicy().
+
+**/
+EFI_STATUS
+EFIAPI
+RegisterBasicVariablePolicy (
+ IN EDKII_VARIABLE_POLICY_PROTOCOL *VariablePolicy,
+ IN CONST EFI_GUID *Namespace,
+ IN CONST CHAR16 *Name OPTIONAL,
+ IN UINT32 MinSize,
+ IN UINT32 MaxSize,
+ IN UINT32 AttributesMustHave,
+ IN UINT32 AttributesCantHave,
+ IN UINT8 LockPolicyType
+ );
+
+
+/**
+ This helper function does everything that CreateBasicVariablePolicy() does, but also
+ uses the passed in protocol to register the policy with the infrastructure.
+ Does not return a buffer, does not require the caller to free anything.
+
+ @param[in] VariablePolicy Pointer to a valid instance of the VariablePolicy protocol.
+ @param[in] Namespace Pointer to an EFI_GUID for the target variable namespace that this policy will protect.
+ @param[in] Name [Optional] If provided, a pointer to the CHAR16 array for the target variable name.
+ Otherwise, will create a policy that targets an entire namespace.
+ @param[in] MinSize MinSize for the VariablePolicy.
+ @param[in] MaxSize MaxSize for the VariablePolicy.
+ @param[in] AttributesMustHave AttributesMustHave for the VariablePolicy.
+ @param[in] AttributesCantHave AttributesCantHave for the VariablePolicy.
+ @param[in] VarStateNamespace Pointer to the EFI_GUID for the VARIABLE_LOCK_ON_VAR_STATE_POLICY.Namespace.
+ @param[in] VarStateName Pointer to the CHAR16 array for the VARIABLE_LOCK_ON_VAR_STATE_POLICY.Name.
+ @param[in] VarStateValue Value for the VARIABLE_LOCK_ON_VAR_STATE_POLICY.Value.
+
+ @retval EFI_INVALID_PARAMETER VariablePolicy pointer is NULL.
+ @retval EFI_STATUS Status returned by CreateBasicVariablePolicy() or RegisterVariablePolicy().
+
+**/
+EFI_STATUS
+EFIAPI
+RegisterVarStateVariablePolicy (
+ IN EDKII_VARIABLE_POLICY_PROTOCOL *VariablePolicy,
+ IN CONST EFI_GUID *Namespace,
+ IN CONST CHAR16 *Name OPTIONAL,
+ IN UINT32 MinSize,
+ IN UINT32 MaxSize,
+ IN UINT32 AttributesMustHave,
+ IN UINT32 AttributesCantHave,
+ IN CONST EFI_GUID *VarStateNamespace,
+ IN CONST CHAR16 *VarStateName,
+ IN UINT8 VarStateValue
+ );
+
+#endif // _EDKII_VARIABLE_POLICY_HELPER_LIB_H_
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