qdev: rework device properties.

This patch is a major overhaul of the device properties.  The properties
are saved directly in the device state struct now, the linked list of
property values is gone.

Advantages:
  * We don't have to maintain the list with the property values.
  * The value in the property list and the value actually used by
    the device can't go out of sync any more (used to happen for
    the pci.devfn == -1 case) because there is only one place where
    the value is stored.
  * A record describing the property is required now, you can't set
    random properties any more.

There are bus-specific and device-specific properties.  The former
should be used for properties common to all bus drivers.  Typical
use case is bus addressing, i.e. pci.devfn and i2c.address.

Properties have a PropertyInfo struct attached with name, size and
function pointers to parse and print properties.  A few common property
types have PropertyInfos defined in qdev-properties.c.  Drivers are free
to implement their own very special property parsers if needed.

Properties can have default values.  If unset they are zero-filled.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

hw/qdev-addr.c

@@ -0,0 +1,32 @@
+#include "qdev.h"
+#include "qdev-addr.h"
+#include "targphys.h"
+
+/* --- target physical address --- */
+
+static int parse_taddr(DeviceState *dev, Property *prop, const char *str)
+{
+    target_phys_addr_t *ptr = qdev_get_prop_ptr(dev, prop);
+
+    *ptr = strtoull(str, NULL, 16);
+    return 0;
+}
+
+static int print_taddr(DeviceState *dev, Property *prop, char *dest, size_t len)
+{
+    target_phys_addr_t *ptr = qdev_get_prop_ptr(dev, prop);
+    return snprintf(dest, len, "0x" TARGET_FMT_plx, *ptr);
+}
+
+PropertyInfo qdev_prop_taddr = {
+    .name  = "taddr",
+    .type  = PROP_TYPE_TADDR,
+    .size  = sizeof(target_phys_addr_t),
+    .parse = parse_taddr,
+    .print = print_taddr,
+};
+
+void qdev_prop_set_taddr(DeviceState *dev, const char *name, target_phys_addr_t value)
+{
+    qdev_prop_set(dev, name, &value, PROP_TYPE_TADDR);
+}