target/s390x: move psw_key_valid() to mem_helper.c

Only used in that file.
Reviewed-by: NThomas Huth <thuth@redhat.com>
Reviewed-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: NRichard Henderson <richard.henderson@linaro.org>
Signed-off-by: NDavid Hildenbrand <david@redhat.com>
Message-Id: <20170818114353.13455-12-david@redhat.com>
Signed-off-by: NCornelia Huck <cohuck@redhat.com>

target/s390x/cpu.h

@@ -366,17 +366,6 @@ void s390x_cpu_debug_excp_handler(CPUState *cs);
 #define MMU_SECONDARY_IDX       1
 #define MMU_HOME_IDX            2
 
-static inline bool psw_key_valid(CPUS390XState *env, uint8_t psw_key)
-{
-    uint16_t pkm = env->cregs[3] >> 16;
-
-    if (env->psw.mask & PSW_MASK_PSTATE) {
-        /* PSW key has range 0..15, it is valid if the bit is 1 in the PKM */
-        return pkm & (0x80 >> psw_key);
-    }
-    return true;
-}
-
 static inline int cpu_mmu_index(CPUS390XState *env, bool ifetch)
 {
     switch (env->psw.mask & PSW_MASK_ASC) {

target/s390x/mem_helper.c

@@ -56,6 +56,17 @@ void tlb_fill(CPUState *cs, target_ulong addr, MMUAccessType access_type,
 #define HELPER_LOG(x...)
 #endif
 
+static inline bool psw_key_valid(CPUS390XState *env, uint8_t psw_key)
+{
+    uint16_t pkm = env->cregs[3] >> 16;
+
+    if (env->psw.mask & PSW_MASK_PSTATE) {
+        /* PSW key has range 0..15, it is valid if the bit is 1 in the PKM */
+        return pkm & (0x80 >> psw_key);
+    }
+    return true;
+}
+
 /* Reduce the length so that addr + len doesn't cross a page boundary.  */
 static inline uint32_t adj_len_to_page(uint32_t len, uint64_t addr)
 {