convert macros to constexpr

include/zinnia/pci.h

@@ -132,8 +132,8 @@ errno_t pci_bar_get(struct pci_device* dev, size_t index, struct pci_bar* out);
 uint8_t pci_cap_next(struct pci_device* dev, uint8_t cur);
 uint8_t pci_cap_find(struct pci_device* dev, uint8_t id);
 
-#define PCI_ANY_ID    0xffff
-#define PCI_ANY_CLASS 0xff
+constexpr uint16_t PCI_ANY_ID = 0xffff;
+constexpr uint8_t PCI_ANY_CLASS = 0xff;
 
 // Matches a device by ID and class.
 struct pci_match {

include/zinnia/radix.h

@@ -4,8 +4,8 @@
 #include <stddef.h>
 #include <stdint.h>
 
-#define RADIX_BITS  6
-#define RADIX_SLOTS (1 << RADIX_BITS)
+constexpr size_t RADIX_BITS = 6;
+constexpr size_t RADIX_SLOTS = 1 << RADIX_BITS;
 
 enum radix_tag : uint8_t {
     RADIX_TAG_DIRTY,

include/zinnia/usb.h

@@ -2,8 +2,8 @@
 
 #include <stdint.h>
 
-#define USB_ANY_ID    0xffff
-#define USB_ANY_CLASS 0xff
+constexpr uint16_t USB_ANY_ID = 0xffff;
+constexpr uint8_t USB_ANY_CLASS = 0xff;
 
 struct usb_match {
     uint16_t vendor_id;