[PULL 27/28] target/arm: Use ARMGranuleSize in ARMVAParameters

[Peter Maydell <peter.maydell@linaro.org>]

Now we have an enum for the granule size, use it in the
ARMVAParameters struct instead of the using16k/using64k bools.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20221003162315.2833797-3-peter.maydell@linaro.org
---
 target/arm/internals.h | 23 +++++++++++++++++++++--
 target/arm/helper.c    | 39 ++++++++++++++++++++++++++++-----------
 target/arm/ptw.c       |  8 +-------
 3 files changed, 50 insertions(+), 20 deletions(-)

diff --git a/target/arm/internals.h b/target/arm/internals.h
index 6166ac0a98f..9566364dcae 100644
--- a/target/arm/internals.h
+++ b/target/arm/internals.h
@@ -1007,6 +1007,26 @@ typedef enum ARMGranuleSize {
     GranInvalid,
 } ARMGranuleSize;
 
+/**
+ * arm_granule_bits: Return address size of the granule in bits
+ *
+ * Return the address size of the granule in bits. This corresponds
+ * to the pseudocode TGxGranuleBits().
+ */
+static inline int arm_granule_bits(ARMGranuleSize gran)
+{
+    switch (gran) {
+    case Gran64K:
+        return 16;
+    case Gran16K:
+        return 14;
+    case Gran4K:
+        return 12;
+    default:
+        g_assert_not_reached();
+    }
+}
+
 /*
  * Parameters of a given virtual address, as extracted from the
  * translation control register (TCR) for a given regime.
@@ -1019,10 +1039,9 @@ typedef struct ARMVAParameters {
     bool tbi        : 1;
     bool epd        : 1;
     bool hpd        : 1;
-    bool using16k   : 1;
-    bool using64k   : 1;
     bool tsz_oob    : 1;  /* tsz has been clamped to legal range */
     bool ds         : 1;
+    ARMGranuleSize gran : 2;
 } ARMVAParameters;
 
 ARMVAParameters aa64_va_parameters(CPUARMState *env, uint64_t va,
diff --git a/target/arm/helper.c b/target/arm/helper.c
index d7f578f2baa..dde64a487ae 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -4473,6 +4473,24 @@ typedef struct {
     uint64_t length;
 } TLBIRange;
 
+static ARMGranuleSize tlbi_range_tg_to_gran_size(int tg)
+{
+    /*
+     * Note that the TLBI range TG field encoding differs from both
+     * TG0 and TG1 encodings.
+     */
+    switch (tg) {
+    case 1:
+        return Gran4K;
+    case 2:
+        return Gran16K;
+    case 3:
+        return Gran64K;
+    default:
+        return GranInvalid;
+    }
+}
+
 static TLBIRange tlbi_aa64_get_range(CPUARMState *env, ARMMMUIdx mmuidx,
                                      uint64_t value)
 {
@@ -4481,17 +4499,19 @@ static TLBIRange tlbi_aa64_get_range(CPUARMState *env, ARMMMUIdx mmuidx,
     uint64_t select = sextract64(value, 36, 1);
     ARMVAParameters param = aa64_va_parameters(env, select, mmuidx, true);
     TLBIRange ret = { };
+    ARMGranuleSize gran;
 
     page_size_granule = extract64(value, 46, 2);
+    gran = tlbi_range_tg_to_gran_size(page_size_granule);
 
     /* The granule encoded in value must match the granule in use. */
-    if (page_size_granule != (param.using64k ? 3 : param.using16k ? 2 : 1)) {
+    if (gran != param.gran) {
         qemu_log_mask(LOG_GUEST_ERROR, "Invalid tlbi page size granule %d\n",
                       page_size_granule);
         return ret;
     }
 
-    page_shift = (page_size_granule - 1) * 2 + 12;
+    page_shift = arm_granule_bits(gran);
     num = extract64(value, 39, 5);
     scale = extract64(value, 44, 2);
     exponent = (5 * scale) + 1;
@@ -10375,7 +10395,7 @@ ARMVAParameters aa64_va_parameters(CPUARMState *env, uint64_t va,
                                    ARMMMUIdx mmu_idx, bool data)
 {
     uint64_t tcr = regime_tcr(env, mmu_idx);
-    bool epd, hpd, using16k, using64k, tsz_oob, ds;
+    bool epd, hpd, tsz_oob, ds;
     int select, tsz, tbi, max_tsz, min_tsz, ps, sh;
     ARMGranuleSize gran;
     ARMCPU *cpu = env_archcpu(env);
@@ -10419,11 +10439,9 @@ ARMVAParameters aa64_va_parameters(CPUARMState *env, uint64_t va,
     }
 
     gran = sanitize_gran_size(cpu, gran, stage2);
-    using64k = gran == Gran64K;
-    using16k = gran == Gran16K;
 
     if (cpu_isar_feature(aa64_st, cpu)) {
-        max_tsz = 48 - using64k;
+        max_tsz = 48 - (gran == Gran64K);
     } else {
         max_tsz = 39;
     }
@@ -10433,7 +10451,7 @@ ARMVAParameters aa64_va_parameters(CPUARMState *env, uint64_t va,
      * adjust the effective value of DS, as documented.
      */
     min_tsz = 16;
-    if (using64k) {
+    if (gran == Gran64K) {
         if (cpu_isar_feature(aa64_lva, cpu)) {
             min_tsz = 12;
         }
@@ -10442,14 +10460,14 @@ ARMVAParameters aa64_va_parameters(CPUARMState *env, uint64_t va,
         switch (mmu_idx) {
         case ARMMMUIdx_Stage2:
         case ARMMMUIdx_Stage2_S:
-            if (using16k) {
+            if (gran == Gran16K) {
                 ds = cpu_isar_feature(aa64_tgran16_2_lpa2, cpu);
             } else {
                 ds = cpu_isar_feature(aa64_tgran4_2_lpa2, cpu);
             }
             break;
         default:
-            if (using16k) {
+            if (gran == Gran16K) {
                 ds = cpu_isar_feature(aa64_tgran16_lpa2, cpu);
             } else {
                 ds = cpu_isar_feature(aa64_tgran4_lpa2, cpu);
@@ -10486,10 +10504,9 @@ ARMVAParameters aa64_va_parameters(CPUARMState *env, uint64_t va,
         .tbi = tbi,
         .epd = epd,
         .hpd = hpd,
-        .using16k = using16k,
-        .using64k = using64k,
         .tsz_oob = tsz_oob,
         .ds = ds,
+        .gran = gran,
     };
 }
 
diff --git a/target/arm/ptw.c b/target/arm/ptw.c
index ddacffa7ee6..23f16f4ff7f 100644
--- a/target/arm/ptw.c
+++ b/target/arm/ptw.c
@@ -1062,13 +1062,7 @@ static bool get_phys_addr_lpae(CPUARMState *env, uint64_t address,
         }
     }
 
-    if (param.using64k) {
-        stride = 13;
-    } else if (param.using16k) {
-        stride = 11;
-    } else {
-        stride = 9;
-    }
+    stride = arm_granule_bits(param.gran) - 3;
 
     /*
      * Note that QEMU ignores shareability and cacheability attributes,
-- 
2.25.1