target-microblaze: mmu: Make the TLBX MISS bit read-only

Make the TLBX MISS bit read-only.

Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>

diff --git a/target/microblaze/mmu.c b/target/microblaze/mmu.c
index 839181190030129995eb9aa336c9c7819dfd350d..9d5e6aa8a535ac6d348230fee060665db5a0f229 100644 (file)
--- a/target/microblaze/mmu.c
+++ b/target/microblaze/mmu.c
@@ -273,6 +273,10 @@ void mmu_write(CPUMBState *env, uint32_t rn, uint32_t v)
                 env->mmu.regs[rn] = v;
             }
             break;
+        case MMU_R_TLBX:
+            /* Bit 31 is read-only.  */
+            env->mmu.regs[rn] = deposit32(env->mmu.regs[rn], 0, 31, v);
+            break;
         case MMU_R_TLBSX:
         {
             struct microblaze_mmu_lookup lu;