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feat(plat/fvp): introduce accessor function to obtain datastore

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In order to provide the EL3 SPMC a sufficient datastore to
record memory descriptors, a accessor function is used.
This allows for the backing memory to be allocated in a
platform defined manner, to accommodate memory constraints
and desired use cases.

Provide an implementation for the Arm FVP platform to
use a default value of 512KB memory allocated in the
TZC RAM section.

Signed-off-by: Marc Bonnici <marc.bonnici@arm.com>
Change-Id: I92bc55ba6e04bdad429eb52f0d2960ceda682804
This commit is contained in:
Marc Bonnici 2021-12-16 18:31:02 +00:00
parent e0b1a6d59e
commit 6a0788bc0e
3 changed files with 36 additions and 0 deletions
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4
include/plat/common/platform.h
View file

@ -347,6 +347,10 @@ int plat_spm_sp_get_next_address(void **sp_base, size_t *sp_size,
int plat_spm_core_manifest_load(spmc_manifest_attribute_t *manifest,
const void *pm_addr);
#endif
#if defined(SPMC_AT_EL3)
int plat_spmc_shmem_datastore_get(uint8_t **datastore, size_t *size);
#endif
/*******************************************************************************
* Mandatory BL image load functions(may be overridden).
******************************************************************************/

28
plat/arm/board/fvp/fvp_el3_spmc.c Normal file
View file

@ -0,0 +1,28 @@
/*
* Copyright (c) 2022, Arm Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <platform_def.h>
/*
* On the FVP platform when using the EL3 SPMC implementation allocate the
* datastore for tracking shared memory descriptors in the TZC DRAM section
* to ensure sufficient storage can be allocated.
* Provide an implementation of the accessor method to allow the datastore
* details to be retrieved by the SPMC.
* The SPMC will take care of initializing the memory region.
*/
#define PLAT_SPMC_SHMEM_DATASTORE_SIZE 512 * 1024
__section("arm_el3_tzc_dram") static uint8_t
plat_spmc_shmem_datastore[PLAT_SPMC_SHMEM_DATASTORE_SIZE];
int plat_spmc_shmem_datastore_get(uint8_t **datastore, size_t *size)
{
*datastore = plat_spmc_shmem_datastore;
*size = PLAT_SPMC_SHMEM_DATASTORE_SIZE;
return 0;
}

4
plat/arm/board/fvp/platform.mk
View file

@ -425,3 +425,7 @@ ENABLE_SYS_REG_TRACE_FOR_NS := 1
# enable trace filter control registers access to NS by default
ENABLE_TRF_FOR_NS := 1
ifeq (${SPMC_AT_EL3}, 1)
PLAT_BL_COMMON_SOURCES += plat/arm/board/fvp/fvp_el3_spmc.c
endif