From 0bef0edffd7d2957704a74d37cdec91af7df39e3 Mon Sep 17 00:00:00 2001
From: Jeenu Viswambharan <jeenu.viswambharan@arm.com>
Date: Tue, 24 Oct 2017 11:47:13 +0100
Subject: ARM platforms: Define exception macros

Define number of priority bits, and allocate priority levels for SDEI.

Change-Id: Ib6bb6c5c09397f7caef950c4caed5a737b3d4112
Signed-off-by: Jeenu Viswambharan <jeenu.viswambharan@arm.com>
---
 include/plat/arm/common/arm_def.h |  6 ++++++
 plat/arm/common/aarch64/arm_ehf.c | 24 ++++++++++++++++++++++++
 plat/arm/common/arm_common.mk     |  4 ++++
 3 files changed, 34 insertions(+)
 create mode 100644 plat/arm/common/aarch64/arm_ehf.c

diff --git a/include/plat/arm/common/arm_def.h b/include/plat/arm/common/arm_def.h
index 9e82e298..5177b06e 100644
--- a/include/plat/arm/common/arm_def.h
+++ b/include/plat/arm/common/arm_def.h
@@ -454,5 +454,11 @@
  */
 #define PLAT_PERCPU_BAKERY_LOCK_SIZE		(1 * CACHE_WRITEBACK_GRANULE)
 
+/* Priority levels for ARM platforms */
+#define PLAT_SDEI_CRITICAL_PRI		0x60
+#define PLAT_SDEI_NORMAL_PRI		0x70
+
+/* ARM platforms use 3 upper bits of secure interrupt priority */
+#define ARM_PRI_BITS			3
 
 #endif /* __ARM_DEF_H__ */
diff --git a/plat/arm/common/aarch64/arm_ehf.c b/plat/arm/common/aarch64/arm_ehf.c
new file mode 100644
index 00000000..785b7bb5
--- /dev/null
+++ b/plat/arm/common/aarch64/arm_ehf.c
@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <ehf.h>
+#include <platform_def.h>
+
+/*
+ * Enumeration of priority levels on ARM platforms.
+ */
+ehf_pri_desc_t arm_exceptions[] = {
+#if SDEI_SUPPORT
+	/* Critical priority SDEI */
+	EHF_PRI_DESC(ARM_PRI_BITS, PLAT_SDEI_CRITICAL_PRI),
+
+	/* Normal priority SDEI */
+	EHF_PRI_DESC(ARM_PRI_BITS, PLAT_SDEI_NORMAL_PRI),
+#endif
+};
+
+/* Plug in ARM exceptions to Exception Handling Framework. */
+EHF_REGISTER_PRIORITIES(arm_exceptions, ARRAY_SIZE(arm_exceptions), ARM_PRI_BITS);
diff --git a/plat/arm/common/arm_common.mk b/plat/arm/common/arm_common.mk
index 44eb43f6..a3cd9d85 100644
--- a/plat/arm/common/arm_common.mk
+++ b/plat/arm/common/arm_common.mk
@@ -184,6 +184,10 @@ BL31_SOURCES		+=	plat/arm/common/arm_sip_svc.c			\
 				lib/pmf/pmf_smc.c
 endif
 
+ifeq (${EL3_EXCEPTION_HANDLING},1)
+BL31_SOURCES		+=	plat/arm/common/aarch64/arm_ehf.c
+endif
+
 ifneq (${TRUSTED_BOARD_BOOT},0)
 
     # Include common TBB sources
-- 
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