pci_prd_upcalls_t
extern int pci_prd_init(pci_prd_upcalls_t *);
static pci_prd_upcalls_t *prd_upcalls;
pci_prd_init(pci_prd_upcalls_t *upcalls)
static pci_prd_upcalls_t pci_upcalls = {