target/arm: Move {arm_s1_, }regime_using_lpae_format to tlb_helper.c

These functions are used for both page table walking and for
deciding what format in which to deliver exception results.
Since ptw.c is only present for system mode, put the functions
into tlb_helper.c.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220604040607.269301-18-richard.henderson@linaro.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 26 insertions, 0 deletions

diff --git a/target/arm/tlb_helper.c b/target/arm/tlb_helper.c
index 6421e16202..7d8a86b3c4 100644
--- a/target/arm/tlb_helper.c
+++ b/target/arm/tlb_helper.c
@@ -11,6 +11,32 @@
 #include "exec/exec-all.h"
 #include "exec/helper-proto.h"
 
+
+/* Return true if the translation regime is using LPAE format page tables */
+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;
+    }
+    if (arm_feature(env, ARM_FEATURE_LPAE)
+        && (regime_tcr(env, mmu_idx)->raw_tcr & TTBCR_EAE)) {
+        return true;
+    }
+    return false;
+}
+
+/*
+ * Returns true if the stage 1 translation regime is using LPAE format page
+ * tables. Used when raising alignment exceptions, whose FSR changes depending
+ * on whether the long or short descriptor format is in use.
+ */
+bool arm_s1_regime_using_lpae_format(CPUARMState *env, ARMMMUIdx mmu_idx)
+{
+    mmu_idx = stage_1_mmu_idx(mmu_idx);
+    return regime_using_lpae_format(env, mmu_idx);
+}
+
 static inline uint32_t merge_syn_data_abort(uint32_t template_syn,
                                             unsigned int target_el,
                                             bool same_el, bool ea,