feat(el3-runtime): handle traps for IMPDEF registers accesses
This patch introduces support to handle traps from lower ELs for
IMPDEF system register accesses. The actual support is left to the
platforms to implement.
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>
Change-Id: I623d5c432b4ce4328b68f238c15b1c83df97c1e5
diff --git a/include/bl31/sync_handle.h b/include/bl31/sync_handle.h
index e211575..1ac4f98 100644
--- a/include/bl31/sync_handle.h
+++ b/include/bl31/sync_handle.h
@@ -1,5 +1,6 @@
/*
* Copyright (c) 2022, ARM Limited. All rights reserved.
+ * Copyright (c) 2023, NVIDIA Corporation. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@@ -16,6 +17,7 @@
#define ISS_SYSREG_DIRECTION_MASK 0x000001UL
#define ISS_SYSREG_OPCODE_RNDR 0x30c808U
+#define ISS_SYSREG_OPCODE_IMPDEF 0x303c00U
#define ISS_SYSREG_OPCODE_RNDRRS 0x32c808U
#define TRAP_RET_UNHANDLED -1
@@ -54,6 +56,7 @@
int handle_sysreg_trap(uint64_t esr_el3, cpu_context_t *ctx);
/* Prototypes for system register emulation handlers provided by platforms. */
+int plat_handle_impdef_trap(uint64_t esr_el3, cpu_context_t *ctx);
int plat_handle_rng_trap(uint64_t esr_el3, cpu_context_t *ctx);
#endif /* __ASSEMBLER__ */