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