AArch32: Add API to invoke runtime service handler
This patch adds an API in runtime service framework to
invoke the registered handler corresponding to the SMC function
identifier. This is helpful for AArch32 because the number of
arguments required by the handler is more than registers
available as per AArch32 program calling conventions and
requires the use of stack. Hence this new API will do the
necessary argument setup and invoke the appropriate
handler. Although this API is primarily intended for AArch32,
it can be used for AArch64 as well.
Change-Id: Iefa15947fe5a1df55b0859886e677446a0fd7241
diff --git a/include/common/runtime_svc.h b/include/common/runtime_svc.h
index adafcee..514f334 100644
--- a/include/common/runtime_svc.h
+++ b/include/common/runtime_svc.h
@@ -43,10 +43,17 @@
* Constants to allow the assembler access a runtime service
* descriptor
*/
+#ifdef AARCH32
+#define RT_SVC_SIZE_LOG2 4
+#define RT_SVC_DESC_INIT 8
+#define RT_SVC_DESC_HANDLE 12
+#else
#define RT_SVC_SIZE_LOG2 5
-#define SIZEOF_RT_SVC_DESC (1 << RT_SVC_SIZE_LOG2)
#define RT_SVC_DESC_INIT 16
#define RT_SVC_DESC_HANDLE 24
+#endif /* AARCH32 */
+#define SIZEOF_RT_SVC_DESC (1 << RT_SVC_SIZE_LOG2)
+
/*
* The function identifier has 6 bits for the owning entity number and
@@ -123,10 +130,22 @@
((call_type & FUNCID_TYPE_MASK) \
<< FUNCID_OEN_WIDTH))
+/*
+ * This macro generates the unique owning entity number from the SMC Function
+ * ID. This unique oen is used to access an entry in the
+ * 'rt_svc_descs_indices' array to invoke the corresponding runtime service
+ * handler during SMC handling.
+ */
+#define get_unique_oen_from_smc_fid(fid) \
+ get_unique_oen(((fid) >> FUNCID_OEN_SHIFT), \
+ ((fid) >> FUNCID_TYPE_SHIFT))
+
/*******************************************************************************
* Function & variable prototypes
******************************************************************************/
void runtime_svc_init(void);
+uintptr_t handle_runtime_svc(uint32_t smc_fid, void *cookie, void *handle,
+ unsigned int flags);
extern uintptr_t __RT_SVC_DESCS_START__;
extern uintptr_t __RT_SVC_DESCS_END__;
void init_crash_reporting(void);