277 lines
13 KiB
C
277 lines
13 KiB
C
/** @file -- VariablePolicy.h
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This protocol allows communication with Variable Policy Engine.
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Copyright (c) Microsoft Corporation.
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#ifndef __EDKII_VARIABLE_POLICY_PROTOCOL__
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#define __EDKII_VARIABLE_POLICY_PROTOCOL__
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#define EDKII_VARIABLE_POLICY_PROTOCOL_REVISION 0x0000000000020000
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/*
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Rev 0x0000000000010000:
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- Initial protocol definition
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Rev 0x0000000000020000:
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- Add GetVariablePolicyInfo() API
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- Add GetLockOnVariableStateVariablePolicyInfo() API
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*/
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#define EDKII_VARIABLE_POLICY_PROTOCOL_GUID \
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{ \
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0x81D1675C, 0x86F6, 0x48DF, { 0xBD, 0x95, 0x9A, 0x6E, 0x4F, 0x09, 0x25, 0xC3 } \
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}
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#define VARIABLE_POLICY_ENTRY_REVISION 0x00010000
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#pragma pack(push, 1)
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typedef struct {
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UINT32 Version;
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UINT16 Size;
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UINT16 OffsetToName;
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EFI_GUID Namespace;
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UINT32 MinSize;
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UINT32 MaxSize;
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UINT32 AttributesMustHave;
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UINT32 AttributesCantHave;
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UINT8 LockPolicyType;
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UINT8 Padding[3];
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// UINT8 LockPolicy[]; // Variable Length Field
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// CHAR16 Name[] // Variable Length Field
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} VARIABLE_POLICY_ENTRY;
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#define VARIABLE_POLICY_NO_MIN_SIZE 0
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#define VARIABLE_POLICY_NO_MAX_SIZE MAX_UINT32
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#define VARIABLE_POLICY_NO_MUST_ATTR 0
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#define VARIABLE_POLICY_NO_CANT_ATTR 0
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#define VARIABLE_POLICY_TYPE_NO_LOCK 0
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#define VARIABLE_POLICY_TYPE_LOCK_NOW 1
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#define VARIABLE_POLICY_TYPE_LOCK_ON_CREATE 2
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#define VARIABLE_POLICY_TYPE_LOCK_ON_VAR_STATE 3
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typedef struct {
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EFI_GUID Namespace;
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UINT8 Value;
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UINT8 Padding;
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// CHAR16 Name[]; // Variable Length Field
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} VARIABLE_LOCK_ON_VAR_STATE_POLICY;
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#pragma pack(pop)
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/**
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This API function disables the variable policy enforcement. If it's
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already been called once, will return EFI_ALREADY_STARTED.
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@retval EFI_SUCCESS
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@retval EFI_ALREADY_STARTED Has already been called once this boot.
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@retval EFI_WRITE_PROTECTED Interface has been locked until reboot.
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@retval EFI_WRITE_PROTECTED Interface option is disabled by platform PCD.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *DISABLE_VARIABLE_POLICY)(
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VOID
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);
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/**
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This API function returns whether or not the policy engine is
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currently being enforced.
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@param[out] State Pointer to a return value for whether the policy enforcement
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is currently enabled.
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@retval EFI_SUCCESS
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@retval Others An error has prevented this command from completing.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *IS_VARIABLE_POLICY_ENABLED)(
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OUT BOOLEAN *State
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);
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/**
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This API function validates and registers a new policy with
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the policy enforcement engine.
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@param[in] NewPolicy Pointer to the incoming policy structure.
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@retval EFI_SUCCESS
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@retval EFI_INVALID_PARAMETER NewPolicy is NULL or is internally inconsistent.
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@retval EFI_ALREADY_STARTED An identical matching policy already exists.
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@retval EFI_WRITE_PROTECTED The interface has been locked until the next reboot.
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@retval EFI_ABORTED A calculation error has prevented this function from completing.
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@retval EFI_OUT_OF_RESOURCES Cannot grow the table to hold any more policies.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *REGISTER_VARIABLE_POLICY)(
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IN CONST VARIABLE_POLICY_ENTRY *PolicyEntry
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);
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/**
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This API function will dump the entire contents of the variable policy table.
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Similar to GetVariable, the first call can be made with a 0 size and it will return
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the size of the buffer required to hold the entire table.
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@param[out] Policy Pointer to the policy buffer. Can be NULL if Size is 0.
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@param[in,out] Size On input, the size of the output buffer. On output, the size
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of the data returned.
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@retval EFI_SUCCESS Policy data is in the output buffer and Size has been updated.
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@retval EFI_INVALID_PARAMETER Size is NULL, or Size is non-zero and Policy is NULL.
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@retval EFI_BUFFER_TOO_SMALL Size is insufficient to hold policy. Size updated with required size.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *DUMP_VARIABLE_POLICY)(
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IN OUT UINT8 *Policy,
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IN OUT UINT32 *Size
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);
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/**
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This API function locks the interface so that no more policy updates
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can be performed or changes made to the enforcement until the next boot.
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@retval EFI_SUCCESS
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@retval Others An error has prevented this command from completing.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *LOCK_VARIABLE_POLICY)(
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VOID
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);
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/**
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This function will return variable policy information for a UEFI variable with a
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registered variable policy.
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@param[in] VariableName The name of the variable to use for the policy search.
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@param[in] VendorGuid The vendor GUID of the variable to use for the policy search.
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@param[in,out] VariablePolicyVariableNameBufferSize On input, the size, in bytes, of the VariablePolicyVariableName
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buffer.
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On output, the size, in bytes, needed to store the variable
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policy variable name.
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If testing for the VariablePolicyVariableName buffer size
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needed, set this value to zero so EFI_BUFFER_TOO_SMALL is
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guaranteed to be returned if the variable policy variable name
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is found.
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@param[out] VariablePolicy Pointer to a buffer where the policy entry will be written
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if found.
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@param[out] VariablePolicyVariableName Pointer to a buffer where the variable name used for the
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variable policy will be written if a variable name is
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registered.
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If the variable policy is not associated with a variable name
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(e.g. applied to variable vendor namespace) and this parameter
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is given, this parameter will not be modified and
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VariablePolicyVariableNameBufferSize will be set to zero to
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indicate a name was not present.
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If the pointer given is not NULL,
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VariablePolicyVariableNameBufferSize must be non-NULL.
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@retval EFI_SUCCESS A variable policy entry was found and returned successfully.
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@retval EFI_BAD_BUFFER_SIZE An internal buffer size caused a calculation error.
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@retval EFI_BUFFER_TOO_SMALL The VariablePolicyVariableName buffer value is too small for the size needed.
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The buffer should now point to the size needed.
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@retval EFI_NOT_READY Variable policy has not yet been initialized.
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@retval EFI_INVALID_PARAMETER A required pointer argument passed is NULL. This will be returned if
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VariablePolicyVariableName is non-NULL and VariablePolicyVariableNameBufferSize
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is NULL.
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@retval EFI_NOT_FOUND A variable policy was not found for the given UEFI variable name and vendor GUID.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *GET_VARIABLE_POLICY_INFO)(
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IN CONST CHAR16 *VariableName,
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IN CONST EFI_GUID *VendorGuid,
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IN OUT UINTN *VariablePolicyVariableNameBufferSize OPTIONAL,
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OUT VARIABLE_POLICY_ENTRY *VariablePolicy,
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OUT CHAR16 *VariablePolicyVariableName OPTIONAL
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);
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/**
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This function will return the Lock on Variable State policy information for the policy
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associated with the given UEFI variable.
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@param[in] VariableName The name of the variable to use for the policy search.
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@param[in] VendorGuid The vendor GUID of the variable to use for the policy
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search.
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@param[in,out] VariableLockPolicyVariableNameBufferSize On input, the size, in bytes, of the
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VariableLockPolicyVariableName buffer.
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On output, the size, in bytes, needed to store the variable
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policy variable name.
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If testing for the VariableLockPolicyVariableName buffer
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size needed, set this value to zero so EFI_BUFFER_TOO_SMALL
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is guaranteed to be returned if the variable policy variable
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name is found.
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@param[out] VariablePolicy Pointer to a buffer where the policy entry will be written
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if found.
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@param[out] VariableLockPolicyVariableName Pointer to a buffer where the variable name used for the
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variable lock on variable state policy will be written if
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a variable name is registered.
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If the lock on variable policy is not associated with a
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variable name (e.g. applied to variable vendor namespace)
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and this parameter is given, this parameter will not be
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modified and VariableLockPolicyVariableNameBufferSize will
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be set to zero to indicate a name was not present.
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If the pointer given is not NULL,
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VariableLockPolicyVariableNameBufferSize must be non-NULL.
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@retval EFI_SUCCESS A Lock on Variable State variable policy entry was found and returned
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successfully.
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@retval EFI_BAD_BUFFER_SIZE An internal buffer size caused a calculation error.
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@retval EFI_BUFFER_TOO_SMALL The VariableLockPolicyVariableName buffer is too small for the size needed.
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The buffer should now point to the size needed.
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@retval EFI_NOT_READY Variable policy has not yet been initialized.
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@retval EFI_INVALID_PARAMETER A required pointer argument passed is NULL. This will be returned if
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VariableLockPolicyVariableName is non-NULL and
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VariableLockPolicyVariableNameBufferSize is NULL.
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@retval EFI_NOT_FOUND A Lock on Variable State variable policy was not found for the given UEFI
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variable name and vendor GUID.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *GET_LOCK_ON_VARIABLE_STATE_VARIABLE_POLICY_INFO)(
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IN CONST CHAR16 *VariableName,
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IN CONST EFI_GUID *VendorGuid,
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IN OUT UINTN *VariableLockPolicyVariableNameBufferSize OPTIONAL,
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OUT VARIABLE_LOCK_ON_VAR_STATE_POLICY *VariablePolicy,
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OUT CHAR16 *VariableLockPolicyVariableName OPTIONAL
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);
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typedef struct {
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UINT64 Revision;
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DISABLE_VARIABLE_POLICY DisableVariablePolicy;
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IS_VARIABLE_POLICY_ENABLED IsVariablePolicyEnabled;
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REGISTER_VARIABLE_POLICY RegisterVariablePolicy;
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DUMP_VARIABLE_POLICY DumpVariablePolicy;
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LOCK_VARIABLE_POLICY LockVariablePolicy;
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GET_VARIABLE_POLICY_INFO GetVariablePolicyInfo;
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GET_LOCK_ON_VARIABLE_STATE_VARIABLE_POLICY_INFO GetLockOnVariableStateVariablePolicyInfo;
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} _EDKII_VARIABLE_POLICY_PROTOCOL;
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typedef _EDKII_VARIABLE_POLICY_PROTOCOL EDKII_VARIABLE_POLICY_PROTOCOL;
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extern EFI_GUID gEdkiiVariablePolicyProtocolGuid;
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#endif
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