[PATCH v3 24/42] target/arm: Add ARMMMUIdx_Phys_{S,NS}

From: Richard Henderson <richard.henderson@linaro.org>
To: qemu-devel@nongnu.org
Cc: qemu-arm@nongnu.org
Subject: [PATCH v3 24/42] target/arm: Add ARMMMUIdx_Phys_{S,NS}
Date: Sat,  1 Oct 2022 09:23:00 -0700	[thread overview]
Message-ID: <20221001162318.153420-25-richard.henderson@linaro.org> (raw)
In-Reply-To: <20221001162318.153420-1-richard.henderson@linaro.org>

Not yet used, but add mmu indexes for 1-1 mapping
to physical addresses.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 target/arm/cpu-param.h |  2 +-
 target/arm/cpu.h       |  7 ++++++-
 target/arm/ptw.c       | 19 +++++++++++++++++--
 3 files changed, 24 insertions(+), 4 deletions(-)

diff --git a/target/arm/cpu-param.h b/target/arm/cpu-param.h
index 689a9645dc..98bd9e435e 100644
--- a/target/arm/cpu-param.h
+++ b/target/arm/cpu-param.h
@@ -40,6 +40,6 @@
     bool guarded;
 #endif
 
-#define NB_MMU_MODES 8
+#define NB_MMU_MODES 10
 
 #endif
diff --git a/target/arm/cpu.h b/target/arm/cpu.h
index c8cad2ef7c..0effa85c56 100644
--- a/target/arm/cpu.h
+++ b/target/arm/cpu.h
@@ -2899,8 +2899,9 @@ bool write_cpustate_to_list(ARMCPU *cpu, bool kvm_sync);
  * EL2 EL2&0 +PAN
  * EL2 (aka NS PL2)
  * EL3 (aka S PL1)
+ * Physical (NS & S)
  *
- * for a total of 8 different mmu_idx.
+ * for a total of 10 different mmu_idx.
  *
  * R profile CPUs have an MPU, but can use the same set of MMU indexes
  * as A profile. They only need to distinguish EL0 and EL1 (and
@@ -2965,6 +2966,10 @@ typedef enum ARMMMUIdx {
     ARMMMUIdx_E2        = 6 | ARM_MMU_IDX_A,
     ARMMMUIdx_E3        = 7 | ARM_MMU_IDX_A,
 
+    /* TLBs with 1-1 mapping to the physical address spaces. */
+    ARMMMUIdx_Phys_NS   = 8 | ARM_MMU_IDX_A,
+    ARMMMUIdx_Phys_S    = 9 | ARM_MMU_IDX_A,
+
     /*
      * These are not allocated TLBs and are used only for AT system
      * instructions or for the first stage of an S12 page table walk.
diff --git a/target/arm/ptw.c b/target/arm/ptw.c
index ccfef2caca..05dcacf45b 100644
--- a/target/arm/ptw.c
+++ b/target/arm/ptw.c
@@ -179,6 +179,11 @@ static bool regime_translation_disabled(CPUARMState *env, ARMMMUIdx mmu_idx,
     case ARMMMUIdx_E3:
         break;
 
+    case ARMMMUIdx_Phys_NS:
+    case ARMMMUIdx_Phys_S:
+        /* No translation for physical address spaces. */
+        return true;
+
     default:
         g_assert_not_reached();
     }
@@ -2286,10 +2291,17 @@ static bool get_phys_addr_disabled(CPUARMState *env, target_ulong address,
 {
     uint8_t memattr = 0x00;    /* Device nGnRnE */
     uint8_t shareability = 0;  /* non-sharable */
+    int r_el;
 
-    if (mmu_idx != ARMMMUIdx_Stage2 && mmu_idx != ARMMMUIdx_Stage2_S) {
-        int r_el = regime_el(env, mmu_idx);
+    switch (mmu_idx) {
+    case ARMMMUIdx_Stage2:
+    case ARMMMUIdx_Stage2_S:
+    case ARMMMUIdx_Phys_NS:
+    case ARMMMUIdx_Phys_S:
+        break;
 
+    default:
+        r_el = regime_el(env, mmu_idx);
         if (arm_el_is_aa64(env, r_el)) {
             int pamax = arm_pamax(env_archcpu(env));
             uint64_t tcr = env->cp15.tcr_el[r_el];
@@ -2338,6 +2350,7 @@ static bool get_phys_addr_disabled(CPUARMState *env, target_ulong address,
             shareability = 2; /* outer sharable */
         }
         result->cacheattrs.is_s2_format = false;
+        break;
     }
 
     result->f.phys_addr = address;
@@ -2543,6 +2556,7 @@ bool get_phys_addr(CPUARMState *env, target_ulong address,
         is_secure = arm_is_secure_below_el3(env);
         break;
     case ARMMMUIdx_Stage2:
+    case ARMMMUIdx_Phys_NS:
     case ARMMMUIdx_MPrivNegPri:
     case ARMMMUIdx_MUserNegPri:
     case ARMMMUIdx_MPriv:
@@ -2551,6 +2565,7 @@ bool get_phys_addr(CPUARMState *env, target_ulong address,
         break;
     case ARMMMUIdx_E3:
     case ARMMMUIdx_Stage2_S:
+    case ARMMMUIdx_Phys_S:
     case ARMMMUIdx_MSPrivNegPri:
     case ARMMMUIdx_MSUserNegPri:
     case ARMMMUIdx_MSPriv:
-- 
2.34.1


