From aabbc2f8b2a4e1a458a34b9ff5becb997c6157ff Mon Sep 17 00:00:00 2001 From: Abdellatif El Khlifi Date: Thu, 13 Jul 2023 14:28:46 +0100 Subject: arm_ffa: efi: introduce FF-A MM communication Add MM communication support using FF-A transport This feature allows accessing MM partitions services through EFI MM communication protocol. MM partitions such as StandAlonneMM or smm-gateway secure partitions which reside in secure world. An MM shared buffer and a door bell event are used to exchange the data. The data is used by EFI services such as GetVariable()/SetVariable() and copied from the communication buffer to the MM shared buffer. The secure partition is notified about availability of data in the MM shared buffer by an FF-A message (door bell). On such event, MM SP can read the data and updates the MM shared buffer with the response data. The response data is copied back to the communication buffer and consumed by the EFI subsystem. MM communication protocol supports FF-A 64-bit direct messaging. Signed-off-by: Abdellatif El Khlifi Tested-by: Gowtham Suresh Kumar Reviewed-by: Simon Glass Cc: Tom Rini Cc: Ilias Apalodimas Cc: Jens Wiklander --- include/mm_communication.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'include') diff --git a/include/mm_communication.h b/include/mm_communication.h index e65fbde60d0..f17847583b2 100644 --- a/include/mm_communication.h +++ b/include/mm_communication.h @@ -6,6 +6,9 @@ * Copyright (c) 2017, Intel Corporation. All rights reserved. * Copyright (C) 2020 Linaro Ltd. * Copyright (C) 2020 Linaro Ltd. + * Copyright 2022-2023 Arm Limited and/or its affiliates + * Authors: + * Abdellatif El Khlifi */ #ifndef _MM_COMMUNICATION_H_ @@ -13,6 +16,9 @@ #include +/* MM service UUID string (big-endian format). This UUID is common across all MM SPs */ +#define MM_SP_UUID "33d532ed-e699-0942-c09c-a798d9cd722d" + /* * Interface to the pseudo Trusted Application (TA), which provides a * communication channel with the Standalone MM (Management Mode) @@ -248,4 +254,11 @@ struct smm_variable_var_check_property { u16 name[]; }; +/* supported MM transports */ +enum mm_comms_select { + MM_COMMS_UNDEFINED, + MM_COMMS_FFA, + MM_COMMS_OPTEE +}; + #endif /* _MM_COMMUNICATION_H_ */ -- cgit v1.2.3