pci: helper functions to access PCIDevice::config

add helper functions to get/set PCIDevice::config
Those will be used later.
Signed-off-by: NIsaku Yamahata <yamahata@valinux.co.jp>
Acked-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

hw/pci.h

@@ -311,6 +311,18 @@ pci_get_long(uint8_t *config)
     return le32_to_cpupu((uint32_t *)config);
 }
 
+static inline void
+pci_set_quad(uint8_t *config, uint64_t val)
+{
+    cpu_to_le64w((uint64_t *)config, val);
+}
+
+static inline uint64_t
+pci_get_quad(uint8_t *config)
+{
+    return le64_to_cpup((uint64_t *)config);
+}
+
 static inline void
 pci_config_set_vendor_id(uint8_t *pci_config, uint16_t val)
 {