target/arm: Introduce tlbi_aa64_get_range

Merge tlbi_aa64_range_get_length and tlbi_aa64_range_get_base,
returning a structure containing both results.  Pass in the
ARMMMUIdx, rather than the digested two_ranges boolean.

This is in preparation for FEAT_LPA2, where the interpretation
of 'value' depends on the effective value of DS for the regime.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220301215958.157011-13-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

target/arm/helper.c

@@ -4511,70 +4511,60 @@ static void tlbi_aa64_vae3is_write(CPUARMState *env, const ARMCPRegInfo *ri,
 }
 
 #ifdef TARGET_AARCH64
-static uint64_t tlbi_aa64_range_get_length(CPUARMState *env,
+typedef struct {
-                                           uint64_t value)
+    uint64_t base;
-{
-    unsigned int page_shift;
-    unsigned int page_size_granule;
-    uint64_t num;
-    uint64_t scale;
-    uint64_t exponent;
     uint64_t length;
+} TLBIRange;
+
+static TLBIRange tlbi_aa64_get_range(CPUARMState *env, ARMMMUIdx mmuidx,
+                                     uint64_t value)
+{
+    unsigned int page_size_granule, page_shift, num, scale, exponent;
+    TLBIRange ret = { };
 
-    num = extract64(value, 39, 5);
-    scale = extract64(value, 44, 2);
     page_size_granule = extract64(value, 46, 2);
 
     if (page_size_granule == 0) {
         qemu_log_mask(LOG_GUEST_ERROR, "Invalid page size granule %d\n",
                       page_size_granule);
-        return 0;
+        return ret;
     }
 
     page_shift = (page_size_granule - 1) * 2 + 12;
-
+    num = extract64(value, 39, 5);
+    scale = extract64(value, 44, 2);
     exponent = (5 * scale) + 1;
-    length = (num + 1) << (exponent + page_shift);
 
-    return length;
+    ret.length = (num + 1) << (exponent + page_shift);
-}
 
-static uint64_t tlbi_aa64_range_get_base(CPUARMState *env, uint64_t value,
+    if (regime_has_2_ranges(mmuidx)) {
-                                        bool two_ranges)
+        ret.base = sextract64(value, 0, 37) << TARGET_PAGE_BITS;
-{
-    /* TODO: ARMv8.7 FEAT_LPA2 */
-    uint64_t pageaddr;
-
-    if (two_ranges) {
-        pageaddr = sextract64(value, 0, 37) << TARGET_PAGE_BITS;
     } else {
-        pageaddr = extract64(value, 0, 37) << TARGET_PAGE_BITS;
+        ret.base = extract64(value, 0, 37) << TARGET_PAGE_BITS;
     }
 
-    return pageaddr;
+    return ret;
 }
 
 static void do_rvae_write(CPUARMState *env, uint64_t value,
                           int idxmap, bool synced)
 {
     ARMMMUIdx one_idx = ARM_MMU_IDX_A | ctz32(idxmap);
-    bool two_ranges = regime_has_2_ranges(one_idx);
+    TLBIRange range;
-    uint64_t baseaddr, length;
     int bits;
 
-    baseaddr = tlbi_aa64_range_get_base(env, value, two_ranges);
+    range = tlbi_aa64_get_range(env, one_idx, value);
-    length = tlbi_aa64_range_get_length(env, value);
+    bits = tlbbits_for_regime(env, one_idx, range.base);
-    bits = tlbbits_for_regime(env, one_idx, baseaddr);
 
     if (synced) {
         tlb_flush_range_by_mmuidx_all_cpus_synced(env_cpu(env),
-                                                  baseaddr,
+                                                  range.base,
-                                                  length,
+                                                  range.length,
                                                   idxmap,
                                                   bits);
     } else {
-        tlb_flush_range_by_mmuidx(env_cpu(env), baseaddr,
+        tlb_flush_range_by_mmuidx(env_cpu(env), range.base,
-                                  length, idxmap, bits);
+                                  range.length, idxmap, bits);
     }
 }