@@ -231,6 +231,38 @@ const PropertyInfo qdev_prop_bit64 = {
.set_default_value = set_default_value_bool,
};
+/* Read-only Bit64 */
+
+static void prop_set_read_only_bit64(Object *obj, Visitor *v, const char *name,
+ void *opaque, Error **errp)
+{
+ return;
+}
+
+static uint64_t qdev_get_prop_read_only_mask64(Property *prop)
+{
+ assert(prop->info == &qdev_prop_read_only_bit64);
+ return 0x1ull << prop->bitnr;
+}
+
+static void prop_get_read_only_bit64(Object *obj, Visitor *v, const char *name,
+ void *opaque, Error **errp)
+{
+ Property *prop = opaque;
+ uint64_t *p = object_field_prop_ptr(obj, prop);
+ bool value = (*p & qdev_get_prop_read_only_mask64(prop)) != 0;
+
+ visit_type_bool(v, name, &value, errp);
+}
+
+const PropertyInfo qdev_prop_read_only_bit64 = {
+ .name = "bool",
+ .description = "on/off",
+ .get = prop_get_read_only_bit64,
+ .set = prop_set_read_only_bit64,
+ .set_default_value = set_default_value_bool,
+};
+
/* --- bool --- */
static void get_bool(Object *obj, Visitor *v, const char *name, void *opaque,
@@ -46,6 +46,7 @@ struct PropertyInfo {
extern const PropertyInfo qdev_prop_bit;
extern const PropertyInfo qdev_prop_bit64;
+extern const PropertyInfo qdev_prop_read_only_bit64;
extern const PropertyInfo qdev_prop_bool;
extern const PropertyInfo qdev_prop_enum;
extern const PropertyInfo qdev_prop_uint8;
@@ -102,6 +103,10 @@ extern const PropertyInfo qdev_prop_link;
.set_default = true, \
.defval.u = (bool)_defval)
+#define DEFINE_PROP_READ_ONLY_BIT64(_name, _state, _field, _bit) \
+ DEFINE_PROP(_name, _state, _field, qdev_prop_read_only_bit64, uint64_t, \
+ .bitnr = (_bit))
+
#define PROP_ARRAY_LEN_PREFIX "len-"
/**
In some situations, we need a property that tracks the bit but can't change it (for instance, guest features of virtio device). Signed-off-by: Maxim Davydov <maxim.davydov@virtuozzo.com> --- hw/core/qdev-properties.c | 32 ++++++++++++++++++++++++++++++++ include/hw/qdev-properties.h | 5 +++++ 2 files changed, 37 insertions(+)