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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Headers for EFI variable service via StandAloneMM, EDK2 application running
* in OP-TEE. Most of the structs and defines resemble the EDK2 naming.
*
* Copyright (c) 2017, Intel Corporation. All rights reserved.
* Copyright (C) 2020 Linaro Ltd.
*/
#ifndef _MM_COMMUNICATION_H_
#define _MM_COMMUNICATION_H_
/*
* Interface to the pseudo Trusted Application (TA), which provides a
* communication channel with the Standalone MM (Management Mode)
* Secure Partition running at Secure-EL0
*/
#define PTA_STMM_CMD_COMMUNICATE 0
/*
* Defined in OP-TEE, this UUID is used to identify the pseudo-TA.
* OP-TEE is using big endian GUIDs while UEFI uses little endian ones
*/
#define PTA_STMM_UUID \
UUID_INIT(0xed32d533, 0x99e6, 0x4209, \
0x9c, 0xc0, 0x2d, 0x72, 0xcd, 0xd9, 0x98, 0xa7)
#define EFI_MM_VARIABLE_GUID \
EFI_GUID(0xed32d533, 0x99e6, 0x4209, \
0x9c, 0xc0, 0x2d, 0x72, 0xcd, 0xd9, 0x98, 0xa7)
/**
* struct efi_mm_communicate_header - Header used for SMM variable communication
* @header_guid: header use for disambiguation of content
* @message_len: length of the message. Does not include the size of the
* header
* @data: payload of the message
*
* Defined in the PI spec as EFI_MM_COMMUNICATE_HEADER.
* To avoid confusion in interpreting frames, the communication buffer should
* always begin with efi_mm_communicate_header.
*/
struct efi_mm_communicate_header {
efi_guid_t header_guid;
size_t message_len;
u8 data[];
} __packed;
#define MM_COMMUNICATE_HEADER_SIZE \
(sizeof(struct efi_mm_communicate_header))
/* SPM return error codes */
#define ARM_SVC_SPM_RET_SUCCESS 0
#define ARM_SVC_SPM_RET_NOT_SUPPORTED -1
#define ARM_SVC_SPM_RET_INVALID_PARAMS -2
#define ARM_SVC_SPM_RET_DENIED -3
#define ARM_SVC_SPM_RET_NO_MEMORY -5
#define SMM_VARIABLE_FUNCTION_GET_VARIABLE 1
/*
* The payload for this function is
* SMM_VARIABLE_COMMUNICATE_GET_NEXT_VARIABLE_NAME.
*/
#define SMM_VARIABLE_FUNCTION_GET_NEXT_VARIABLE_NAME 2
/*
* The payload for this function is SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE.
*/
#define SMM_VARIABLE_FUNCTION_SET_VARIABLE 3
/*
* The payload for this function is
* SMM_VARIABLE_COMMUNICATE_QUERY_VARIABLE_INFO.
*/
#define SMM_VARIABLE_FUNCTION_QUERY_VARIABLE_INFO 4
/*
* It is a notify event, no extra payload for this function.
*/
#define SMM_VARIABLE_FUNCTION_READY_TO_BOOT 5
/*
* It is a notify event, no extra payload for this function.
*/
#define SMM_VARIABLE_FUNCTION_EXIT_BOOT_SERVICE 6
/*
* The payload for this function is VARIABLE_INFO_ENTRY.
* The GUID in EFI_SMM_COMMUNICATE_HEADER is gEfiSmmVariableProtocolGuid.
*/
#define SMM_VARIABLE_FUNCTION_GET_STATISTICS 7
/*
* The payload for this function is SMM_VARIABLE_COMMUNICATE_LOCK_VARIABLE
*/
#define SMM_VARIABLE_FUNCTION_LOCK_VARIABLE 8
#define SMM_VARIABLE_FUNCTION_VAR_CHECK_VARIABLE_PROPERTY_SET 9
#define SMM_VARIABLE_FUNCTION_VAR_CHECK_VARIABLE_PROPERTY_GET 10
#define SMM_VARIABLE_FUNCTION_GET_PAYLOAD_SIZE 11
/*
* The payload for this function is
* SMM_VARIABLE_COMMUNICATE_RUNTIME_VARIABLE_CACHE_CONTEXT
*/
#define SMM_VARIABLE_FUNCTION_INIT_RUNTIME_VARIABLE_CACHE_CONTEXT 12
#define SMM_VARIABLE_FUNCTION_SYNC_RUNTIME_CACHE 13
/*
* The payload for this function is
* SMM_VARIABLE_COMMUNICATE_GET_RUNTIME_CACHE_INFO
*/
#define SMM_VARIABLE_FUNCTION_GET_RUNTIME_CACHE_INFO 14
/**
* struct smm_variable_communicate_header - Used for SMM variable communication
* @function: function to call in Smm.
* @ret_status: return status
* @data: payload
*/
struct smm_variable_communicate_header {
size_t function;
efi_status_t ret_status;
u8 data[];
};
#define MM_VARIABLE_COMMUNICATE_SIZE \
(sizeof(struct smm_variable_communicate_header))
/**
* struct smm_variable_access - Used to communicate with StMM by
* SetVariable and GetVariable.
* @guid: vendor GUID
* @data_size: size of EFI variable data
* @name_size: size of EFI name
* @attr: attributes
* @name: variable name
*
*/
struct smm_variable_access {
efi_guid_t guid;
size_t data_size;
size_t name_size;
u32 attr;
u16 name[];
};
#define MM_VARIABLE_ACCESS_HEADER_SIZE \
(sizeof(struct smm_variable_access))
/**
* struct smm_variable_payload_size - Used to get the max allowed
* payload used in StMM.
*
* @size: size to fill in
*
*/
struct smm_variable_payload_size {
size_t size;
};
/**
* struct smm_variable_getnext - Used to communicate with StMM for
* GetNextVariableName.
*
* @guid: vendor GUID
* @name_size: size of the name of the variable
* @name: variable name
*
*/
struct smm_variable_getnext {
efi_guid_t guid;
size_t name_size;
u16 name[];
};
#define MM_VARIABLE_GET_NEXT_HEADER_SIZE \
(sizeof(struct smm_variable_getnext))
/**
* struct smm_variable_query_info - Used to communicate with StMM for
* QueryVariableInfo.
*
* @max_variable_storage: max available storage
* @remaining_variable_storage: remaining available storage
* @max_variable_size: max variable supported size
* @attr: attributes to query storage for
*
*/
struct smm_variable_query_info {
u64 max_variable_storage;
u64 remaining_variable_storage;
u64 max_variable_size;
u32 attr;
};
#define VAR_CHECK_VARIABLE_PROPERTY_REVISION 0x0001
#define VAR_CHECK_VARIABLE_PROPERTY_READ_ONLY BIT(0)
/**
* struct var_check_property - Used to store variable properties in StMM
*
* @revision: magic revision number for variable property checking
* @property: properties mask for the variable used in StMM.
* Currently RO flag is supported
* @attributes: variable attributes used in StMM checking when properties
* for a variable are enabled
* @minsize: minimum allowed size for variable payload checked against
* smm_variable_access->datasize in StMM
* @maxsize: maximum allowed size for variable payload checked against
* smm_variable_access->datasize in StMM
*
*/
struct var_check_property {
u16 revision;
u16 property;
u32 attributes;
size_t minsize;
size_t maxsize;
};
/**
* struct smm_variable_var_check_property - Used to communicate variable
* properties with StMM
*
* @guid: vendor GUID
* @name_size: size of EFI name
* @property: variable properties struct
* @name: variable name
*
*/
struct smm_variable_var_check_property {
efi_guid_t guid;
size_t name_size;
struct var_check_property property;
u16 name[];
};
#endif /* _MM_COMMUNICATION_H_ */
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