bus_get_resource9
Read a resource range/value with a given resource id
Usage
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/rman.h>
int
bus_get_resource(device_t dev, int type, int rid, rman_res_t *startp, rman_res_t *countp);
Overview
The bus_get_resource() function reads the range or value of the resource type, rid, pair and stores it in the startp and countp arguments.
The arguments are as follows:
- dev
-
The device to read the resource from.
- type
-
The type of resource you want to read. It is one of:
- SYS_RES_IRQ
-
for IRQs
- SYS_RES_DRQ
-
for ISA DMA lines
- SYS_RES_MEMORY
-
for I/O memory
- SYS_RES_IOPORT
-
for I/O ports
- rid
-
A bus-specific handle that identifies the resource being read.
- startp
-
A pointer to the start address of this resource.
- countp
-
A pointer to the length of the resource. For example, the size of the memory in bytes.
Return values
Zero is returned on success, otherwise an error is returned.
Releases
27 releases since FreeBSD 10.3-RELEASE; the text changed 13 times.