feat(sys_reg_trace): initialize trap settings of trace system registers access
Trap bits of trace system registers access are in architecturally
UNKNOWN state at boot hence
1. Initialized trap bits to one to prohibit trace system registers
accesses in lower ELs (EL2, EL1) in all security states when system
trace registers are implemented.
2. These bits are RES0 in the absence of system trace register support
and hence set it to zero to aligns with the Arm ARM reference
recommendation,that mentions software must writes RES0 bits with
all 0s.
Change-Id: I4b6c15cda882325273492895d72568b29de89ca3
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
diff --git a/include/arch/aarch64/arch.h b/include/arch/aarch64/arch.h
index 47e02ce..2a38123 100644
--- a/include/arch/aarch64/arch.h
+++ b/include/arch/aarch64/arch.h
@@ -188,6 +188,12 @@
#define EL_IMPL_A64ONLY ULL(1)
#define EL_IMPL_A64_A32 ULL(2)
+/* ID_AA64DFR0_EL1.TraceVer definitions */
+#define ID_AA64DFR0_TRACEVER_SHIFT U(4)
+#define ID_AA64DFR0_TRACEVER_MASK ULL(0xf)
+#define ID_AA64DFR0_TRACEVER_SUPPORTED ULL(1)
+#define ID_AA64DFR0_TRACEVER_LENGTH U(4)
+
/* ID_AA64DFR0_EL1.PMS definitions (for ARMv8.2+) */
#define ID_AA64DFR0_PMS_SHIFT U(32)
#define ID_AA64DFR0_PMS_MASK ULL(0xf)