include/mm_communication.h

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 /*
   3  *  Headers for EFI variable service via StandAloneMM, EDK2 application running
   4  *  in OP-TEE
   5  *
   6  *  Copyright (c) 2017, Intel Corporation. All rights reserved.
   7  *  Copyright (C) 2020 Linaro Ltd. <sughosh.ganu@linaro.org>
   8  *  Copyright (C) 2020 Linaro Ltd. <ilias.apalodimas@linaro.org>
   9  */
  10
  11 #ifndef _MM_COMMUNICATION_H_
  12 #define _MM_COMMUNICATION_H_
  13
  14 #include <part_efi.h>
  15
  16 /*
  17  * Interface to the pseudo Trusted Application (TA), which provides a
  18  * communication channel with the Standalone MM (Management Mode)
  19  * Secure Partition running at Secure-EL0
  20  */
  21
  22 #define PTA_STMM_CMDID_COMMUNICATE 0
  23
  24 /* OP-TEE is using big endian GUIDs while UEFI uses little endian ones */
  25 #define PTA_STMM_UUID { 0xed32d533, 0x99e6, 0x4209, {\
  26                         0x9c, 0xc0, 0x2d, 0x72, 0xcd, 0xd9, 0x98, 0xa7 } }
  27
  28 #define EFI_MM_VARIABLE_GUID \
  29         EFI_GUID(0xed32d533, 0x99e6, 0x4209, \
  30                  0x9c, 0xc0, 0x2d, 0x72, 0xcd, 0xd9, 0x98, 0xa7)
  31
  32 /* Defined in EDK2 MdePkg/Include/Protocol/MmCommunication.h */
  33
  34 /**
  35  * struct efi_mm_communicate_header - Header used for SMM variable communication
  36
  37  * @header_guid:  header use for disambiguation of content
  38  * @message_len:  length of the message. Does not include the size of the
  39  *                header
  40  * @data:         payload of the message
  41  *
  42  * Defined in EDK2 as EFI_MM_COMMUNICATE_HEADER.
  43  * To avoid confusion in interpreting frames, the communication buffer should
  44  * always begin with efi_mm_communicate_header.
  45  */
  46 struct efi_mm_communicate_header {
  47         efi_guid_t header_guid;
  48         size_t     message_len;
  49         u8         data[];
  50 };
  51
  52 #define MM_COMMUNICATE_HEADER_SIZE \
  53         (sizeof(struct efi_mm_communicate_header))
  54
  55 /* Defined in EDK2 ArmPkg/Include/IndustryStandard/ArmStdSmc.h */
  56
  57 /* MM return error codes */
  58 #define ARM_SMC_MM_RET_SUCCESS              0
  59 #define ARM_SMC_MM_RET_NOT_SUPPORTED       -1
  60 #define ARM_SMC_MM_RET_INVALID_PARAMS      -2
  61 #define ARM_SMC_MM_RET_DENIED              -3
  62 #define ARM_SMC_MM_RET_NO_MEMORY           -4
  63
  64 /* Defined in EDK2 MdeModulePkg/Include/Guid/SmmVariableCommon.h */
  65
  66 #define SMM_VARIABLE_FUNCTION_GET_VARIABLE  1
  67 /*
  68  * The payload for this function is
  69  * SMM_VARIABLE_COMMUNICATE_GET_NEXT_VARIABLE_NAME.
  70  */
  71 #define SMM_VARIABLE_FUNCTION_GET_NEXT_VARIABLE_NAME  2
  72 /*
  73  * The payload for this function is SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE.
  74  */
  75 #define SMM_VARIABLE_FUNCTION_SET_VARIABLE  3
  76 /*
  77  * The payload for this function is
  78  * SMM_VARIABLE_COMMUNICATE_QUERY_VARIABLE_INFO.
  79  */
  80 #define SMM_VARIABLE_FUNCTION_QUERY_VARIABLE_INFO  4
  81 /*
  82  * It is a notify event, no extra payload for this function.
  83  */
  84 #define SMM_VARIABLE_FUNCTION_READY_TO_BOOT  5
  85 /*
  86  * It is a notify event, no extra payload for this function.
  87  */
  88 #define SMM_VARIABLE_FUNCTION_EXIT_BOOT_SERVICE  6
  89 /*
  90  * The payload for this function is VARIABLE_INFO_ENTRY.
  91  * The GUID in EFI_SMM_COMMUNICATE_HEADER is gEfiSmmVariableProtocolGuid.
  92  */
  93 #define SMM_VARIABLE_FUNCTION_GET_STATISTICS  7
  94 /*
  95  * The payload for this function is SMM_VARIABLE_COMMUNICATE_LOCK_VARIABLE
  96  */
  97 #define SMM_VARIABLE_FUNCTION_LOCK_VARIABLE   8
  98
  99 #define SMM_VARIABLE_FUNCTION_VAR_CHECK_VARIABLE_PROPERTY_SET  9
 100
 101 #define SMM_VARIABLE_FUNCTION_VAR_CHECK_VARIABLE_PROPERTY_GET  10
 102
 103 #define SMM_VARIABLE_FUNCTION_GET_PAYLOAD_SIZE  11
 104 /*
 105  * The payload for this function is
 106  * SMM_VARIABLE_COMMUNICATE_RUNTIME_VARIABLE_CACHE_CONTEXT
 107  */
 108 #define SMM_VARIABLE_FUNCTION_INIT_RUNTIME_VARIABLE_CACHE_CONTEXT 12
 109
 110 #define SMM_VARIABLE_FUNCTION_SYNC_RUNTIME_CACHE  13
 111 /*
 112  * The payload for this function is
 113  * SMM_VARIABLE_COMMUNICATE_GET_RUNTIME_CACHE_INFO
 114  */
 115 #define SMM_VARIABLE_FUNCTION_GET_RUNTIME_CACHE_INFO  14
 116
 117 /**
 118  * struct smm_variable_communicate_header - Used for SMM variable communication
 119
 120  * @function:     function to call in Smm.
 121  * @ret_status:   return status
 122  * @data:         payload
 123  *
 124  * Defined in EDK2 as SMM_VARIABLE_COMMUNICATE_HEADER.
 125  */
 126 struct smm_variable_communicate_header {
 127         efi_uintn_t  function;
 128         efi_status_t ret_status;
 129         u8           data[];
 130 };
 131
 132 #define MM_VARIABLE_COMMUNICATE_SIZE \
 133         (sizeof(struct smm_variable_communicate_header))
 134
 135 /**
 136  * struct smm_variable_access - Used to communicate with StMM by
 137  *                              SetVariable and GetVariable.
 138
 139  * @guid:         vendor GUID
 140  * @data_size:    size of EFI variable data
 141  * @name_size:    size of EFI name
 142  * @attr:         attributes
 143  * @name:         variable name
 144  *
 145  * Defined in EDK2 as SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE.
 146  *
 147  */
 148 struct smm_variable_access {
 149         efi_guid_t  guid;
 150         efi_uintn_t data_size;
 151         efi_uintn_t name_size;
 152         u32         attr;
 153         u16         name[];
 154 };
 155
 156 #define MM_VARIABLE_ACCESS_HEADER_SIZE \
 157         (sizeof(struct smm_variable_access))
 158 /**
 159  * struct smm_variable_payload_size - Used to get the max allowed
 160  *                                    payload used in StMM.
 161  *
 162  * @size:  size to fill in
 163  *
 164  * Defined in EDK2 as SMM_VARIABLE_COMMUNICATE_GET_PAYLOAD_SIZE.
 165  *
 166  */
 167 struct smm_variable_payload_size {
 168         efi_uintn_t size;
 169 };
 170
 171 /**
 172  * struct smm_variable_getnext - Used to communicate with StMM for
 173  *                               GetNextVariableName.
 174  *
 175  * @guid:       vendor GUID
 176  * @name_size:  size of the name of the variable
 177  * @name:       variable name
 178  *
 179  * Defined in EDK2 as SMM_VARIABLE_COMMUNICATE_GET_NEXT_VARIABLE_NAME.
 180  */
 181 struct smm_variable_getnext {
 182         efi_guid_t  guid;
 183         efi_uintn_t name_size;
 184         u16         name[];
 185 };
 186
 187 #define MM_VARIABLE_GET_NEXT_HEADER_SIZE \
 188         (sizeof(struct smm_variable_getnext))
 189
 190 /**
 191  * struct smm_variable_query_info - Used to communicate with StMM for
 192  *                                  QueryVariableInfo.
 193  *
 194  * @max_variable_storage:        max available storage
 195  * @remaining_variable_storage:  remaining available storage
 196  * @max_variable_size:           max variable supported size
 197  * @attr:                        attributes to query storage for
 198  *
 199  * Defined in EDK2 as SMM_VARIABLE_COMMUNICATE_QUERY_VARIABLE_INFO.
 200  */
 201 struct smm_variable_query_info {
 202         u64 max_variable_storage;
 203         u64 remaining_variable_storage;
 204         u64 max_variable_size;
 205         u32 attr;
 206 };
 207
 208 #endif /* _MM_COMMUNICATION_H_ */