target/arm: add arm_is_el2_enabled() helper

This checks if EL2 is enabled (meaning EL2 registers take effects) in
the current security context.

Signed-off-by: Rémi Denis-Courmont <remi.denis.courmont@huawei.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210112104511.36576-2-remi.denis.courmont@huawei.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

diff --git a/target/arm/cpu.h b/target/arm/cpu.h
index f58aada..0bdda90 100644 (file)
--- a/target/arm/cpu.h
+++ b/target/arm/cpu.h
@@ -2148,6 +2148,18 @@ static inline bool arm_is_secure(CPUARMState *env)
     return arm_is_secure_below_el3(env);
 }
 
+/*
+ * Return true if the current security state has AArch64 EL2 or AArch32 Hyp.
+ * This corresponds to the pseudocode EL2Enabled()
+ */
+static inline bool arm_is_el2_enabled(CPUARMState *env)
+{
+    if (arm_feature(env, ARM_FEATURE_EL2)) {
+        return !arm_is_secure_below_el3(env);
+    }
+    return false;
+}
+
 #else
 static inline bool arm_is_secure_below_el3(CPUARMState *env)
 {
@@ -2158,6 +2170,11 @@ static inline bool arm_is_secure(CPUARMState *env)
 {
     return false;
 }
+
+static inline bool arm_is_el2_enabled(CPUARMState *env)
+{
+    return false;
+}
 #endif
 
 /**