target-arm: cpu: Move cpu_is_big_endian to header

There is a CPU data endianness test that is used to drive the
virtio_big_endian test.

Move this up to the header so it can be more generally used for endian
tests. The KVM specific cpu_syncronize_state call is left behind in the
virtio specific function.

Rename it arm_cpu-data_is_big_endian() to more accurately capture that
this is for data accesses only.

Reviewed-by: Alistair Francis <alistair.francis@xilinx.com>
Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

2 files changed, 22 insertions, 16 deletions

diff --git a/target-arm/cpu.c b/target-arm/cpu.c
index 001fccf..352d9f8 100644
--- a/target-arm/cpu.c
+++ b/target-arm/cpu.c
@@ -369,26 +369,13 @@ static void arm_cpu_kvm_set_irq(void *opaque, int irq, int level)
 #endif
 }
 
-static bool arm_cpu_is_big_endian(CPUState *cs)
+static bool arm_cpu_virtio_is_big_endian(CPUState *cs)
 {
     ARMCPU *cpu = ARM_CPU(cs);
     CPUARMState *env = &cpu->env;
-    int cur_el;
 
     cpu_synchronize_state(cs);
-
-    /* In 32bit guest endianness is determined by looking at CPSR's E bit */
-    if (!is_a64(env)) {
-        return (env->uncached_cpsr & CPSR_E) ? 1 : 0;
-    }
-
-    cur_el = arm_current_el(env);
-
-    if (cur_el == 0) {
-        return (env->cp15.sctlr_el[1] & SCTLR_E0E) != 0;
-    }
-
-    return (env->cp15.sctlr_el[cur_el] & SCTLR_EE) != 0;
+    return arm_cpu_data_is_big_endian(env);
 }
 
 #endif
@@ -1476,7 +1463,7 @@ static void arm_cpu_class_init(ObjectClass *oc, void *data)
     cc->get_phys_page_attrs_debug = arm_cpu_get_phys_page_attrs_debug;
     cc->asidx_from_attrs = arm_asidx_from_attrs;
     cc->vmsd = &vmstate_arm_cpu;
-    cc->virtio_is_big_endian = arm_cpu_is_big_endian;
+    cc->virtio_is_big_endian = arm_cpu_virtio_is_big_endian;
     cc->write_elf64_note = arm_cpu_write_elf64_note;
     cc->write_elf32_note = arm_cpu_write_elf32_note;
 #endif
diff --git a/target-arm/cpu.h b/target-arm/cpu.h
index 61b8b03..75e5ea0 100644
--- a/target-arm/cpu.h
+++ b/target-arm/cpu.h
@@ -1908,6 +1908,25 @@ static inline bool arm_sctlr_b(CPUARMState *env)
         (env->cp15.sctlr_el[1] & SCTLR_B) != 0;
 }
 
+/* Return true if the processor is in big-endian mode. */
+static inline bool arm_cpu_data_is_big_endian(CPUARMState *env)
+{
+    int cur_el;
+
+    /* In 32bit endianness is determined by looking at CPSR's E bit */
+    if (!is_a64(env)) {
+        return (env->uncached_cpsr & CPSR_E) ? 1 : 0;
+    }
+
+    cur_el = arm_current_el(env);
+
+    if (cur_el == 0) {
+        return (env->cp15.sctlr_el[1] & SCTLR_E0E) != 0;
+    }
+
+    return (env->cp15.sctlr_el[cur_el] & SCTLR_EE) != 0;
+}
+
 #include "exec/cpu-all.h"
 
 /* Bit usage in the TB flags field: bit 31 indicates whether we are