target/mips: Expose MIPSCPU::is_big_endian property

Add the "big-endian" property and set the CP0C0_BE bit in CP0_Config0.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Tested-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20241010215015.44326-15-philmd@linaro.org>

target/mips/cpu.c

@@ -200,10 +200,8 @@ static void mips_cpu_reset_hold(Object *obj, ResetType type)
 
     /* Reset registers to their default values */
     env->CP0_PRid = env->cpu_model->CP0_PRid;
-    env->CP0_Config0 = env->cpu_model->CP0_Config0;
-#if TARGET_BIG_ENDIAN
-    env->CP0_Config0 |= (1 << CP0C0_BE);
-#endif
+    env->CP0_Config0 = deposit32(env->cpu_model->CP0_Config0,
+                                 CP0C0_BE, 1, cpu->is_big_endian);
     env->CP0_Config1 = env->cpu_model->CP0_Config1;
     env->CP0_Config2 = env->cpu_model->CP0_Config2;
     env->CP0_Config3 = env->cpu_model->CP0_Config3;
@@ -541,6 +539,11 @@ static const struct SysemuCPUOps mips_sysemu_ops = {
 };
 #endif
 
+static Property mips_cpu_properties[] = {
+    DEFINE_PROP_BOOL("big-endian", MIPSCPU, is_big_endian, TARGET_BIG_ENDIAN),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
 #ifdef CONFIG_TCG
 #include "hw/core/tcg-cpu-ops.h"
 /*
@@ -571,6 +574,7 @@ static void mips_cpu_class_init(ObjectClass *c, void *data)
     DeviceClass *dc = DEVICE_CLASS(c);
     ResettableClass *rc = RESETTABLE_CLASS(c);
 
+    device_class_set_props(dc, mips_cpu_properties);
     device_class_set_parent_realize(dc, mips_cpu_realizefn,
                                     &mcc->parent_realize);
     resettable_class_set_parent_phases(rc, NULL, mips_cpu_reset_hold, NULL,

target/mips/cpu.h

@@ -1209,6 +1209,9 @@ struct ArchCPU {
 
     Clock *clock;
     Clock *count_div; /* Divider for CP0_Count clock */
+
+    /* Properties */
+    bool is_big_endian;
 };
 
 /**