target-arm: Define new arm_is_el3_or_mon() function

The GICv3 system registers need to know if the CPU is AArch64
in EL3 or AArch32 in Monitor mode. This happens to be the first
part of the check for arm_is_secure(), so factor it out into a
new arm_is_el3_or_mon() function that the GIC can also use.
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
Reviewed-by: NShannon Zhao <shannon.zhao@linaro.org>
Tested-by: NShannon Zhao <shannon.zhao@linaro.org>
Message-id: 1465915112-29272-4-git-send-email-peter.maydell@linaro.org

target-arm/cpu.h

@@ -1146,8 +1146,8 @@ static inline bool arm_is_secure_below_el3(CPUARMState *env)
     }
 }
 
-/* Return true if the processor is in secure state */
-static inline bool arm_is_secure(CPUARMState *env)
+/* Return true if the CPU is AArch64 EL3 or AArch32 Mon */
+static inline bool arm_is_el3_or_mon(CPUARMState *env)
 {
     if (arm_feature(env, ARM_FEATURE_EL3)) {
         if (is_a64(env) && extract32(env->pstate, 2, 2) == 3) {
@@ -1159,6 +1159,15 @@ static inline bool arm_is_secure(CPUARMState *env)
             return true;
         }
     }
+    return false;
+}
+
+/* Return true if the processor is in secure state */
+static inline bool arm_is_secure(CPUARMState *env)
+{
+    if (arm_is_el3_or_mon(env)) {
+        return true;
+    }
     return arm_is_secure_below_el3(env);
 }