FreeBSD Device Drivers

Hardware Resource Management

As part of configuring and operating devices, a driver might need to manage hardware resources, such as interrupt-request lines (IRQs), I/O ports, or I/O memory (McKusick and Neville-Neil, 2005). Naturally, Newbus includes several functions for doing just that.

#include <sys/param.h> #include <sys/bus.h> #include <machine/bus.h> #include <sys/rman.h> #include <machine/resource.h> struct resource * bus_alloc_resource(device_t dev, int type, int *rid, u_long start, u_long end, u_long count, u_int flags); struct resource * bus_alloc_resource_any(device_t dev, int type, int *rid, u_int flags); int bus_activate_resource(device_t dev, int type, int rid, struct resource *r); int bus_deactivate_resource(device_t dev, int type, ...