[PATCH v4 4/7] target/arm: Enable TTBCR_EAE for ARMv8-R AArch32

[tobias.roehmel]

From: Tobias Röhmel <tobias.roehmel@rwth-aachen.de>

ARMv8-R AArch32 CPUs behave as if TTBCR.EAE is always 1 even
tough they don't have the TTBCR register.
See ARM Architecture Reference Manual Supplement - ARMv8, for the ARMv8-R
AArch32 architecture profile Version:A.c section C1.2.

Signed-off-by: Tobias Röhmel <tobias.roehmel@rwth-aachen.de>
---
 target/arm/debug_helper.c | 3 +++
 target/arm/internals.h    | 4 ++++
 target/arm/tlb_helper.c   | 3 +++
 3 files changed, 10 insertions(+)

diff --git a/target/arm/debug_helper.c b/target/arm/debug_helper.c
index c21739242c..73665f988b 100644
--- a/target/arm/debug_helper.c
+++ b/target/arm/debug_helper.c
@@ -437,6 +437,9 @@ static uint32_t arm_debug_exception_fsr(CPUARMState *env)
 
     if (target_el == 2 || arm_el_is_aa64(env, target_el)) {
         using_lpae = true;
+    } else if (arm_feature(env, ARM_FEATURE_PMSA)
+            && arm_feature(env, ARM_FEATURE_V8)) {
+        using_lpae = true;
     } else {
         if (arm_feature(env, ARM_FEATURE_LPAE) &&
             (env->cp15.tcr_el[target_el] & TTBCR_EAE)) {
diff --git a/target/arm/internals.h b/target/arm/internals.h
index 307a596505..e3699421b0 100644
--- a/target/arm/internals.h
+++ b/target/arm/internals.h
@@ -253,6 +253,10 @@ unsigned int arm_pamax(ARMCPU *cpu);
 static inline bool extended_addresses_enabled(CPUARMState *env)
 {
     uint64_t tcr = env->cp15.tcr_el[arm_is_secure(env) ? 3 : 1];
+    if (arm_feature(env, ARM_FEATURE_PMSA)
+     && arm_feature(env, ARM_FEATURE_V8)) {
+        return true;
+    }
     return arm_el_is_aa64(env, 1) ||
            (arm_feature(env, ARM_FEATURE_LPAE) && (tcr & TTBCR_EAE));
 }
diff --git a/target/arm/tlb_helper.c b/target/arm/tlb_helper.c
index ad225b1cb2..a2047b0bc6 100644
--- a/target/arm/tlb_helper.c
+++ b/target/arm/tlb_helper.c
@@ -18,6 +18,9 @@ bool regime_using_lpae_format(CPUARMState *env, ARMMMUIdx 
mmu_idx)
     int el = regime_el(env, mmu_idx);
     if (el == 2 || arm_el_is_aa64(env, el)) {
         return true;
+    } else if (arm_feature(env, ARM_FEATURE_PMSA)
+            && arm_feature(env, ARM_FEATURE_V8)) {
+        return true;
     }
     if (arm_feature(env, ARM_FEATURE_LPAE)
         && (regime_tcr(env, mmu_idx) & TTBCR_EAE)) {
-- 
2.34.1