tcg: Split out MemOpIdx to exec/memopidx.h

Move this code from tcg/tcg.h to its own header.

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

include/exec/memopidx.h

@@ -0,0 +1,55 @@
+/*
+ * Combine the MemOp and mmu_idx parameters into a single value.
+ *
+ * Authors:
+ *  Richard Henderson <rth@twiddle.net>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#ifndef EXEC_MEMOPIDX_H
+#define EXEC_MEMOPIDX_H 1
+
+#include "exec/memop.h"
+
+typedef uint32_t MemOpIdx;
+
+/**
+ * make_memop_idx
+ * @op: memory operation
+ * @idx: mmu index
+ *
+ * Encode these values into a single parameter.
+ */
+static inline MemOpIdx make_memop_idx(MemOp op, unsigned idx)
+{
+#ifdef CONFIG_DEBUG_TCG
+    assert(idx <= 15);
+#endif
+    return (op << 4) | idx;
+}
+
+/**
+ * get_memop
+ * @oi: combined op/idx parameter
+ *
+ * Extract the memory operation from the combined value.
+ */
+static inline MemOp get_memop(MemOpIdx oi)
+{
+    return oi >> 4;
+}
+
+/**
+ * get_mmuidx
+ * @oi: combined op/idx parameter
+ *
+ * Extract the mmu index from the combined value.
+ */
+static inline unsigned get_mmuidx(MemOpIdx oi)
+{
+    return oi & 15;
+}
+
+#endif