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target-arm: add arm_is_secure() function

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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.fedorov@samsung.com>
Signed-off-by: Fabian Aggeler <aggelerf@ethz.ch>
Signed-off-by: Greg Bellows <greg.bellows@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1413910544-20150-3-git-send-email-greg.bellows@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Fabian Aggeler
2014-10-24 12:19:14 +01:00
committed by Peter Maydell
parent 0b7d409d42
commit 19e0fefa6f
1 changed files with 47 additions and 0 deletions
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47
target-arm/cpu.h
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@@ -753,6 +753,53 @@ static inline int arm_feature(CPUARMState *env, int feature)
return (env->features & (1ULL << feature)) != 0;
}
#if !defined(CONFIG_USER_ONLY)
/* Return true if exception levels below EL3 are in secure state,
* or would be following an exception return to that level.
* Unlike arm_is_secure() (which is always a question about the
* _current_ state of the CPU) this doesn't care about the current
* EL or mode.
*/
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)
{