SPM: PSA API working under Thread mode when level 1
This patch redirects PSA API into a customized 'thread call' ABI to
make it execute in thread mode, when:
- Runtime backend IPC and Isolation Level 1.
This 'thread call' ABI happens in 'Thread mode', and:
- Switch to SPM stack after PSA APIs are called. The working stack
re-uses the NS Agent stack to save runtime memory or allocated a
dedicated stack for it if no Trustzone NS Agent is available. No
need to make SPM working under 'Handler mode' in this case.
- Lock scheduler to ensure PSA API context is not nested because of
scheduling. The locking is performed by setting a flag, and the
scheduler entry checks this flag to decide schedule or not.
- When PSA API returns, switch back to the caller stack. And trigger
scheduler in the caller stack if a scheduling is expected. This
helps the scheduler context management.
- SPM functionalities other than PSA API are still using SVC-based
implementation, such as SPM initialization and log info flushing.
The content of this patch:
- Define interfaces, ABI dispatcher and architecture modifications
to support handling PSA API under thread mode.
- Related header file and source path adjustment to help the build pass.
- Adjust IDLE partition stack size to make runtime execution work, the
original size is too compact to run under debug build of specific
platforms.
Change-Id: I52add3f57ef0f958d25725efb4eb702617586907
Signed-off-by: Ken Liu <Ken.Liu@arm.com>
Co-authored-by: Mingyang Sun <Mingyang.Sun@arm.com>
diff --git a/interface/include/config_impl.h.template b/interface/include/config_impl.h.template
index 4210055..6ef1a2b 100644
--- a/interface/include/config_impl.h.template
+++ b/interface/include/config_impl.h.template
@@ -12,10 +12,16 @@
{% if ipc_partition_num > 0 and sfn_partition_num == 0 %}
#define {{"%-56s"|format("CONFIG_TFM_SPM_BACKEND_IPC")}} 1
+
+#if TFM_LVL > 1
#define {{"%-56s"|format("CONFIG_TFM_PSA_API_SUPERVISOR_CALL")}} 1
+#else
+#define {{"%-56s"|format("CONFIG_TFM_PSA_API_THREAD_CALL")}} 1
+#define {{"%-56s"|format("CONFIG_TFM_SPM_THREAD_STACK_SIZE")}} 1024
+#endif
{% elif sfn_partition_num > 0 and ipc_partition_num == 0 %}
-#define CONFIG_TFM_SPM_BACKEND_SFN 1
+#define {{"%-56s"|format("CONFIG_TFM_SPM_BACKEND_SFN")}} 1
#if TFM_LVL > 1
#error "High isolation level SFN model is not supported."