From: "Edgar E. Iglesias" <edgar.iglesias@xilinx.com>

Make the TLBX MISS bit read-only.

Signed-off-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
---
 target/microblaze/mmu.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/target/microblaze/mmu.c b/target/microblaze/mmu.c
index 8391811900..9d5e6aa8a5 100644
--- 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;
-- 
2.14.1

On Thu, Apr 19, 2018 at 4:21 AM, Edgar E. Iglesias
<edgar.iglesias@gmail.com> wrote:
> From: "Edgar E. Iglesias" <edgar.iglesias@xilinx.com>
>
> Make the TLBX MISS bit read-only.
>
> Signed-off-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>

Reviewed-by: Alistair Francis <alistair.francis@wdc.com>

Alistair

> ---
>  target/microblaze/mmu.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/target/microblaze/mmu.c b/target/microblaze/mmu.c
> index 8391811900..9d5e6aa8a5 100644
> --- 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;
> --
> 2.14.1
>
>