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【简介】
S32K3 系列MCU 内部集成了HSE CORE,HSE CORE 可以对其他核（HOST） 提供安全启动，加密算法等服务，其中host 和 HSE 之间数据信息的交互是通过MU（Messaging Unit）模块来实现的。芯片设计时最多支持MU0-MU4 5个instance,其中MU0/MU1 为固定为HSE 和 HOST 进行通讯数据交互来使用。
以下的host interface 的实现就是依赖MU模块实现的、
每个MU 分为A/B 两端,可以通过A 端的TRi 寄存器发送数据 B 端通过RRi 寄存器来读取数据，完成数据的交互，A 端通过FCR 发送事件 B端通过 FSR 来获取到对应的事件,以下时HSE 文档对交互的说明。
对应的交互流程从下图可以更直接的看出
从上述的流程看涉及的寄存器也只有几个对MU 的的封装就是通过上述的寄存器实现host interface 来进行通讯。
【HSE 通讯数据结构】
HSE 和 host 之间通讯通过如下的结构体，其中srvId 和 srvMetaData 为固定的数据，通过srvId 不同对应的hsesrv union 的机构也有差异根据不同的srvId 来解析数据
typedef struct
{
/** @brief The service ID of the HSE message */
hseSrvId_t srvId;
/** @brief The service metadata (e.g. priority)*/
hseSrvMetaData_t srvMetaData;
/** @brief The service ID will identify a service in the following union */
union
{
/*-------- HSE administrative services --------*/
hseSetAttrSrv_t setAttrReq; /**< @brief Request to set a HSE attribute (note that some attributes are read only) */
hseGetAttrSrv_t getAttrReq; /**< @brief Request to get a HSE attribute */
#ifdef HSE_SPT_SELF_TEST
hseSelfTestSrv_t selfTestReq; /**< @brief Request to execute a HSE self test procedure */
#endif
hseCancelSrv_t cancelSrvReq; /**< @brief Request to cancel a one-pass or streaming service on a specific channel */
#ifdef HSE_SPT_OTA_FIRMWARE_UPDATE
hseFirmwareUpdateSrv_t firmwareUpdateReq; /**< @brief Request to HSE firmware update. */
#endif
/*--------System authorization services--------*/
hseSysAuthorizationReqSrv_t sysAuthorizationReq; /**< @brief Perform an SYS Authorization Request */
hseSysAuthorizationRespSrv_t sysAuthorizationResp; /**< @brief Send the SYS Authorization Response */
#ifdef HSE_SPT_BOOTDATASIGN
hseBootDataImageSignSrv_t bootDataImageSignReq; /**< @brief Request to generate the Signature for Boot Data images (e.g. for HSE_H/M, IVT/DCD/ST/LPDDR4(ZSE devices)/AppBSB image; for HSE_B, IVT/XRDC/AppBSB image) */
hseBootDataImageVerifySrv_t bootDataImageSigVerifyReq;/**< @brief Request to verify the Signature for Boot Data images (e.g. for HSE_H/M, IVT/DCD/ST/LPDDR4(ZSE devices)/AppBSB image; for HSE_B, IVT/XRDC/AppBSB image) */
#endif
#ifdef HSE_SPT_STREAM_CTX_IMPORT_EXPORT
hseImportExportStreamCtxSrv_t importExportStreamCtx; /**< @brief Request to import/export a streaming context. */
#endif
#ifdef HSE_SPT_FLASHLESS_DEV /* HSE_H/M device */
hsePublishSysImageSrv_t publishSysImageReq; /**< @brief Request to Publish a NVM SYS-IMAGE (only for HSE_H/M). */
hseGetSysImageSizeSrv_t getSysImageSizeReq; /**< @brief Request to get SYS-IMAGE size (only for HSE_H/M). */
hseVerifySysImageSrv_t verifySysImageReq; /**< @brief Request to Verify SYS-IMAGE after it is stored in external flash (only for HSE_H/M). */
#ifdef HSE_SPT_MONOTONIC_COUNTERS
hsePublishLoadCntTblSrv_t publishLoadCntTblReq; /**< @brief Request to publish/load the NVM container for the Monotonic Counter table (only for HSE_H/M). */
#endif/*HSE_SPT_MONOTONIC_COUNTERS*/
#ifdef HSE_SPT_OTFAD
hseInstallOtfadContextSrv_t installOtfadReq; /**< @brief Request to install an OTFAD context (only for HSE_H/M). */
hseActivateOtfadContextSrv_t activateOtfadReq; /**< @brief Request to activate on-demand an already installed OTFAD context (only for HSE_H/M). */
hseGetOtfadContextSrv_t getOtfadCtxReq; /**< @brief Request to get OTFAD context information (only for HSE_H/M). */
#endif /* end HSE_SPT_OTFAD */
hsePrepareForStandBySrv_t prepareForStandByReq; /**< @brief Request HSE to prepare for Stand-By mode (only for HSE_H/M). */
#ifdef HSE_SPT_MSC_KEYSTORE
hseConfigKHTTSrv_t configKHTT; /**< @brief Configure the Key Handle Translation Table (KHTT). */
hsePushMscKeySrv_t pushMscKey; /**< @brief Push one or more HSE keys in ACE key store */
#endif /* HSE_SPT_MSC_KEYSTORE*/
#endif /* end HSE_SPT_FLASHLESS_DEV */
#ifdef HSE_SPT_INTERNAL_FLASH_DEV /* HSE_B device */
hseEraseNvmDataSrv_t eraseNvmDataReq; /**< @brief Request to reset HSE data flash. Only allowed in CUST_DEL LC */
#ifdef HSE_SPT_OTA_SBAF_UPDATE
hseSbafUpdateSrv_t sbafUpdateReq; /**< @brief Request to SBAF firmware update. */
#endif /* HSE_SPT_OTA_SBAF_UPDATE */
#ifdef HSE_SPT_ERASE_FW
hseEraseFwSrv_t eraseFwReq; /**< @brief Request to erase sys-img, backup, current firmware. Only allowed in CUST_DEL LC */
#endif /* HSE_SPT_ERASE_FW */
#endif /* HSE_SPT_INTERNAL_FLASH_DEV */
#ifdef HSE_SPT_TMU_REG_CONFIG
hseTmuRegConfigSrv_t tmuRegConfigReq; /**< @brief TMU register configuration */
#endif /* HSE_SPT_TMU_REG_CONFIG */
#ifdef HSE_SPT_TRIM_PASSWORD_PROVISION
hseTrimPasswordProvision_t trimPasswordReq; /**< @brief Request to verify trim password to enable read access for certain system fuses (e.g trim values, MIDR etc). */
#endif /* HSE_SPT_TRIM_PASSWORD_PROVISION */
/*--------HSE key management services--------*/
#ifdef HSE_SPT_ECC_USER_CURVES
hseLoadEccCurveSrv_t loadEccCurveReq; /**< @brief Request to load an ECC curve */
#endif
#ifdef HSE_SPT_FORMAT_KEY_CATALOGS
hseFormatKeyCatalogsSrv_t formatKeyCatalogsReq; /**< @brief Format the key catalogs */
#endif
hseEraseKeySrv_t eraseKeyReq; /**< @brief Request to erase NVM/RAM key(s). */
#ifdef HSE_SPT_GET_KEY_INFO
hseGetKeyInfoSrv_t getKeyInfoReq; /**< @brief Request to get key information (flags) */
#endif
#ifdef HSE_SPT_IMPORT_KEY
hseImportKeySrv_t importKeyReq; /**< @brief Request to import a key. */
#endif
#ifdef HSE_SPT_EXPORT_KEY
hseExportKeySrv_t exportKeyReq; /**< @brief Request to export a key. */
#endif
#ifdef HSE_SPT_KEY_VERIFY
hseKeyVerifySrv_t verifyKeyReq; /**< @brief Request to verify a key. */
#endif
#ifdef HSE_SPT_KEY_GEN
hseKeyGenerateSrv_t keyGenReq; /**< @brief Request to generate a key (e.g. sym random key, rsa key pair etc.) . */
#endif
#ifdef HSE_SPT_COMPUTE_DH
hseDHComputeSharedSecretSrv_t dhComputeSecretReq; /**< @brief Request a ECC Diffie-Hellman Compute shared secret. */
#endif
#ifdef HSE_SPT_BURMESTER_DESMEDT
hseBurmesterDesmedtSrv_t burmesterDesmedtReq; /**< @brief Request to perform a Burmester-Desmedt computation. */
#endif
#ifdef HSE_SPT_KEY_DERIVE
hseKeyDeriveSrv_t keyDeriveReq; /**< @brief Request key derivation function. */
hseKeyDeriveCopyKeySrv_t keyDeriveCopyKeyReq; /**< @brief Request to copy a key from the derived key material. */
#endif
#ifdef HSE_SPT_EXTEND_KEY_CATALOG
hseExtendKeyCatalogSrv_t extendKeyCatalogReq; /**< @brief Request to extend the NVM or RAM key catalog format. */
#endif
#ifdef HSE_SPT_SHE
hseSheLoadKeySrv_t sheLoadKeyReq; /**< @brief Request to load a SHE key using memory update protocol (as per SHE specification) */
hseSheLoadPlainKeySrv_t sheLoadPlainKeyReq; /**< @brief Request to load the SHE RAM key from plain text (as per SHE specification) */
hseSheExportRamKeySrv_t sheExportRamKeyReq; /**< @brief Request to export the SHE RAM key (as per SHE specification) */
hseSheGetIdSrv_t sheGetIdReq; /**< @brief Request to get UID (as per SHE specification) */
#endif
/*--------HSE crypto services--------*/
#ifdef HSE_SPT_HASH
hseHashSrv_t hashReq; /**< @brief Request a HASH */
#endif
hseMacSrv_t macReq; /**< @brief Request to generate/verify a MAC */
#ifdef HSE_SPT_FAST_CMAC
hseFastCMACSrv_t fastCmacReq; /**< @brief Request to FAST generate/verify a CMAC */
#endif
#ifdef HSE_SPT_CMAC_WITH_COUNTER
hseCmacWithCounterSrv_t cmacWithCounterReq; /**< @brief Request to generate/verify a CMAC with counter */
#endif
hseSymCipherSrv_t symCipherReq; /**< @brief Request a Symmetric Cipher operation */
#ifdef HSE_SPT_AEAD
hseAeadSrv_t aeadReq; /**< @brief Request an AEAD operation */
#endif
#ifdef HSE_SPT_XTS_AES
hseXtsAesCipherSrv_t xtsAesCipherReq; /**< @brief Request a XTS AES Cipher operation */
#endif
#ifdef HSE_SPT_SIGN
hseSignSrv_t signReq; /**< @brief Request a Digital Signature Generation/Verification */
#endif
#ifdef HSE_SPT_RSA
hseRsaCipherSrv_t rsaCipherReq; /**< @brief Request a RSA Cipher (Encryption/Decryption) operation */
#endif
#ifdef HSE_SPT_AUTHENC
hseAuthEncSrv_t authEncReq; /**< @brief Request an AuthEncryption operation (encrypt/decrypt + authenticate) */
#endif
#ifdef HSE_SPT_CRC32
hseCrc32Srv_t crc32Req; /**< @brief Request to initialize an CRC computation */
#endif
#ifdef HSE_SPT_SIPHASH
hseSipHashSrv_t sipHashReq; /**< @brief Request to generate/verify a SipHash */
#endif
/*--------HSE random number--------*/
#ifdef HSE_SPT_RANDOM
hseGetRandomNumSrv_t getRandomNumReq; /**< @brief Request to random number generation */
#endif
/*--------HSE monotonic counters--------*/
#ifdef HSE_SPT_MONOTONIC_COUNTERS
hseIncrementCounterSrv_t incCounterReq; /**< @brief Request to increment a monotonic counter */
hseReadCounterSrv_t readCounterReq; /**< @brief Request to read a monotonic counter */
hseConfigSecCounterSrv_t configSecCounter; /**< @brief Request to configure a secure counter */
#endif
/*--------Secure Memory Regions (SMR) management--------*/
#ifdef HSE_SPT_SMR_CR
hseSmrEntryInstallSrv_t smrEntryInstallReq; /**< @brief Request to install a Secure Memory Region (SMR) table entry. */
hseSmrVerifySrv_t smrVerifyReq; /**< @brief Request to verify a Secure Memory Region (SMR) table entry. */
hseSmrEntryEraseSrv_t smrEntryEraseReq; /**< @brief Request to erase a Secure Memory Region (SMR) table entry */
hseCrEntryInstallSrv_t crEntryInstallReq; /**< @brief Request to install a Core Reset (CR) table entry. */
hseCrOnDemandBootSrv_t crOnDemandBootReq; /**< @brief Request to release a Core Reset (CR) table entry. */
hseCrEntryEraseSrv_t crEntryEraseReq; /**< @brief Request to erase a Core Reset (CR) table entry. */
#endif
/*--------IPSEC protocol acceleration--------*/
#ifdef HSE_SPT_IPSEC
hseIpsecInitSrv_t ipsecInitReq; /**< @brief Request to initialize an IPSEC SA. */
hseIpsecProcessSrv_t ipsecProcessReq; /**< @brief Request to process an IPSEC frame. */
hseIpsecGetSeqNumSrv_t ipsecGetSeqNumReq; /**< @brief Request to get the expected sequence number of an SA. */
hseIpsecSetSeqNumSrv_t ipsecSetSeqNumReq; /**< @brief Request to set an SA's expected sequence number. */
#endif
/*-------- HSE CUSTOM SERVICE --------*/
#if HSE_FWTYPE >= 8U
HSE_CUSTOM_SERVICES
#endif
} hseSrv;
} hseSrvDescriptor_t;HSE_IP 的驱动接口函数 Hse_Ip_ServiceRequest 函发送数据的实现就是将上述的结构体成员的地址通过TRI 寄存器通知到HSE core
通过上述简单的MU 寄存器的设定就完成了和HSE CORE 的交互流程
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