HV: extra methods for extracting header fields

Add some encapsulation of utilities which read PCI header space using
wrapper functions. Also contain verification of PCI vendor to its own
function, rather than having hard-coded integrals exposed among other
code.

Tracked-On: #4134
Signed-off-by: Alexander Merritt <alex.merritt@intel.com>
Signed-off-by: Sainath Grandhi <sainath.grandhi@intel.com>
Reviewed-by: Eddie Dong <eddie.dong@intel.com>
Reviewed-by: Jason Chen CJ <jason.cj.chen@intel.com>

Author: amerritt-intel

hypervisor/include/hw/pci.h

@@ -236,5 +236,36 @@ void enable_disable_pci_intx(union pci_bdf bdf, bool enable);
 
 void init_pci_pdev_list(void);
 
+static inline bool is_pci_vendor_valid(uint32_t vendor_id)
+{
+	return !((vendor_id == 0xFFFFFFFFU) || (vendor_id == 0U) ||
+		 (vendor_id == 0xFFFF0000U) || (vendor_id == 0xFFFFU));
+}
+
+static inline uint32_t read_pci_pdev_cfg_vendor(union pci_bdf pbdf)
+{
+	return pci_pdev_read_cfg(pbdf, PCIR_VENDOR, 2U);
+}
+
+static inline uint8_t read_pci_pdev_cfg_headertype(union pci_bdf pbdf)
+{
+	return (uint8_t)pci_pdev_read_cfg(pbdf, PCIR_HDRTYPE, 1U);
+}
+
+static inline uint8_t read_pci_pdev_cfg_secbus(union pci_bdf pbdf)
+{
+	return (uint8_t)pci_pdev_read_cfg(pbdf, PCIR_SECBUS_1, 1U);
+}
+
+static inline bool is_pci_cfg_multifunction(uint8_t header_type)
+{
+	return ((header_type & PCIM_MFDEV) == PCIM_MFDEV);
+}
+
+static inline bool is_pci_cfg_bridge(uint8_t header_type)
+{
+	return ((header_type & PCIM_HDRTYPE) == PCIM_HDRTYPE_BRIDGE);
+}
+
 
 #endif /* PCI_H_ */