User guide
1
Installing and Configuring Enhanced OS-9
Enhanced OS-9 for X86 PCAT 147
func, offsetof(pci_config_reg, irq_line));
printf("PCI irq line = %d\n", irqline);
return EXIT_SUCCESS;
}
pci_read_configuration_word() - read PCI configuration
word
Syntax
#include <pcicnfg.h>
u_int16 pci_read_configuration_word(u_int32 bus, u_int32 dev,
u_int32 func, u_int32 index);
State
System
Description
pci_read_configuration_word() will return the PCI configuration word
value for the PCI device at ’bus’ bus number, ’dev’ device number, ’func’
function number, ’index’ offset into the configuration space.
Header File
MWOS/SRC/DEFS/HW/pcicnfg.h
Example
#include <const.h>
#include <pcicnfg.h>
#include <stdio.h>
#include <stdlib.h>
main()
{
u_int8 bus, dev, func;
u_int16 vend_id;
bus = 0; /* device on bus zero */
device = 11; /* device ID = 11 */
func = 0; /* function number = 0 */
vend_id = pci_read_configuration_word(bus, device,
func, offsetof(pci_config_reg, vendor_id));
printf("PCI vendor id = 0x%04x\n", vendor_id);
return EXIT_SUCCESS;
}