From: Fabian Aggeler aggel...@ethz.ch
arm_is_secure() function allows to determine CPU security state
if the CPU implements Security Extensions/EL3.
arm_is_secure_below_el3() returns true if CPU is in secure state
below EL3.
Signed-off-by: Sergey Fedorov s.fedo...@samsung.com
Signed-off-by: Fabian Aggeler aggel...@ethz.ch
Signed-off-by: Greg Bellows greg.bell...@linaro.org
==
v5 - v6
- Broaden CONFIG_USER conditional
- Merge resulting false returns with common comment
- Globally change Aarch# to AArch#
- Replace direct access of env-aarch64 with is_a64()
---
target-arm/cpu.h | 42 ++
1 file changed, 42 insertions(+)
diff --git a/target-arm/cpu.h b/target-arm/cpu.h
index 81fffd2..4f6db0f 100644
--- a/target-arm/cpu.h
+++ b/target-arm/cpu.h
@@ -753,6 +753,48 @@ static inline int arm_feature(CPUARMState *env, int
feature)
return (env-features (1ULL feature)) != 0;
}
+#if !defined(CONFIG_USER_ONLY)
+/* Return true if exception level below EL3 is in secure state */
+static inline bool arm_is_secure_below_el3(CPUARMState *env)
+{
+if (arm_feature(env, ARM_FEATURE_EL3)) {
+return !(env-cp15.scr_el3 SCR_NS);
+} else {
+/* If EL2 is not supported then the secure state is implementation
+ * defined, in which case QEMU defaults to non-secure.
+ */
+return false;
+}
+}
+
+/* Return true if the processor is in secure state */
+static inline bool arm_is_secure(CPUARMState *env)
+{
+if (arm_feature(env, ARM_FEATURE_EL3)) {
+if (is_a64(env) extract32(env-pstate, 2, 2) == 3) {
+/* CPU currently in AArch64 state and EL3 */
+return true;
+} else if (!is_a64(env)
+(env-uncached_cpsr CPSR_M) == ARM_CPU_MODE_MON) {
+/* CPU currently in AArch32 state and monitor mode */
+return true;
+}
+}
+return arm_is_secure_below_el3(env);
+}
+
+#else
+static inline bool arm_is_secure_below_el3(CPUARMState *env)
+{
+return false;
+}
+
+static inline bool arm_is_secure(CPUARMState *env)
+{
+return false;
+}
+#endif
+
/* Return true if the specified exception level is running in AArch64 state. */
static inline bool arm_el_is_aa64(CPUARMState *env, int el)
{
--
1.8.3.2