target-microblaze: mmu: Add R_TBLX_MISS macros

Add a R_TBLX_MISS MASK and SHIFT macros.

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.h b/target/microblaze/mmu.h
index 3b7a998..113539c 100644
--- a/target/microblaze/mmu.h
+++ b/target/microblaze/mmu.h
@@ -54,6 +54,10 @@
 #define TLB_M                 0x00000002 /* Memory is coherent */
 #define TLB_G                 0x00000001 /* Memory is guarded from prefetch */
 
+/* TLBX  */
+#define R_TBLX_MISS_SHIFT 31
+#define R_TBLX_MISS_MASK (1U << R_TBLX_MISS_SHIFT)
+
 #define TLB_ENTRIES    64
 
 struct microblaze_mmu