1 /*
2  * Copyright (c) 2022, ARM Limited. All rights reserved.
3  * Copyright (c) 2023, NVIDIA Corporation. All rights reserved.
4  *
5  * SPDX-License-Identifier: BSD-3-Clause
6  *
7  * Dispatch synchronous system register traps from lower ELs.
8  */
9 
10 #include <bl31/sync_handle.h>
11 #include <context.h>
12 
handle_sysreg_trap(uint64_t esr_el3,cpu_context_t * ctx)13 int handle_sysreg_trap(uint64_t esr_el3, cpu_context_t *ctx)
14 {
15 	uint64_t __unused opcode = esr_el3 & ISS_SYSREG_OPCODE_MASK;
16 
17 #if ENABLE_FEAT_RNG_TRAP
18 	if ((opcode == ISS_SYSREG_OPCODE_RNDR) || (opcode == ISS_SYSREG_OPCODE_RNDRRS)) {
19 		return plat_handle_rng_trap(esr_el3, ctx);
20 	}
21 #endif
22 
23 #if IMPDEF_SYSREG_TRAP
24 	if ((opcode & ISS_SYSREG_OPCODE_IMPDEF) == ISS_SYSREG_OPCODE_IMPDEF) {
25 		return plat_handle_impdef_trap(esr_el3, ctx);
26 	}
27 #endif
28 
29 	return TRAP_RET_UNHANDLED;
30 }
31