ehf: use common priority level enumuration

'EHF' is used by RAS, SDEI, SPM_MM common frameworks.
If platform needs to plug-in specific handlers then
'PLAT_EHF_DESC' can be used to populate platform specific
priority levels.
Signed-off-by: Sandeep Tripathy <sandeep.tripathy@broadcom.com>
Change-Id: I37af7e0e48111f87b6982604bf5c15db3e05755d

include/plat/arm/common/arm_def.h

@@ -568,7 +568,7 @@
 #define PLAT_SDEI_NORMAL_PRI		0x70
 
 /* ARM platforms use 3 upper bits of secure interrupt priority */
-#define ARM_PRI_BITS			3
+#define PLAT_PRI_BITS			3
 
 /* SGI used for SDEI signalling */
 #define ARM_SDEI_SGI			ARM_IRQ_SEC_SGI_0

plat/arm/common/arm_common.mk

@@ -258,7 +258,7 @@ endif
 endif
 
 ifeq (${EL3_EXCEPTION_HANDLING},1)
-BL31_SOURCES		+=	plat/arm/common/aarch64/arm_ehf.c
+BL31_SOURCES		+=	plat/common/aarch64/plat_ehf.c
 endif
 
 ifeq (${SDEI_SUPPORT},1)

plat/arm/common/aarch64/arm_ehf.c → plat/common/aarch64/plat_ehf.c

 /*
- * Copyright (c) 2017-2019, ARM Limited and Contributors. All rights reserved.
- *
+ * Copyright (c) 2017-2020, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2020, Broadcom
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#include <platform_def.h>
-
 #include <bl31/ehf.h>
 
+#include <platform_def.h>
+
 /*
  * Enumeration of priority levels on ARM platforms.
  */
-ehf_pri_desc_t arm_exceptions[] = {
+ehf_pri_desc_t plat_exceptions[] = {
 #if RAS_EXTENSION
 	/* RAS Priority */
-	EHF_PRI_DESC(ARM_PRI_BITS, PLAT_RAS_PRI),
+	EHF_PRI_DESC(PLAT_PRI_BITS, PLAT_RAS_PRI),
 #endif
 
 #if SDEI_SUPPORT
 	/* Critical priority SDEI */
-	EHF_PRI_DESC(ARM_PRI_BITS, PLAT_SDEI_CRITICAL_PRI),
+	EHF_PRI_DESC(PLAT_PRI_BITS, PLAT_SDEI_CRITICAL_PRI),
 
 	/* Normal priority SDEI */
-	EHF_PRI_DESC(ARM_PRI_BITS, PLAT_SDEI_NORMAL_PRI),
+	EHF_PRI_DESC(PLAT_PRI_BITS, PLAT_SDEI_NORMAL_PRI),
 #endif
 #if SPM_MM
-	EHF_PRI_DESC(ARM_PRI_BITS, PLAT_SP_PRI),
+	EHF_PRI_DESC(PLAT_PRI_BITS, PLAT_SP_PRI),
+#endif
+	/* Plaform specific exceptions description */
+#ifdef PLAT_EHF_DESC
+	PLAT_EHF_DESC,
 #endif
 };
 
 /* Plug in ARM exceptions to Exception Handling Framework. */
-EHF_REGISTER_PRIORITIES(arm_exceptions, ARRAY_SIZE(arm_exceptions), ARM_PRI_BITS);
+EHF_REGISTER_PRIORITIES(plat_exceptions, ARRAY_SIZE(plat_exceptions), PLAT_PRI_BITS);