pci.h File Reference

#include <stdint.h>

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Data Structures
union	pci_device_t

Functions
pci_device_t	pci_get_device (uint16_t vendor_id, uint16_t device_id)
uint32_t	pci_read (pci_device_t device, uint32_t field, uint8_t size)
void	pci_write (pci_device_t device, uint32_t field, uint32_t value)

Detailed Description

See also

https://wiki.osdev.org/PCI

This module manages the Peripheral Component Interconnect (PCI) bus.

Function Documentation

pci_get_device()

pci_device_t pci_get_device	(	uint16_t	vendor_id,
		uint16_t	device_id )

Given a vendor_id and device_id, this function returns the corresponding PCI device if it exists.

Parameters

vendor_id	ID of the manufacturer of the device
device_id	ID of the particular device

Returns

the PCI device or a zero'ed structure

Todo

This is the minimal amount of code to retrieve a PCI device when there is only one with the same vendor and device IDs and no function.

pci_read()

uint32_t pci_read	(	pci_device_t	device,
		uint32_t	field,
		uint8_t	size )

Reads a field from the configuration space.

Parameters

device	the PCI device
field	the field to read
size	the size of the value for the field to read

Returns

the value for the field read

pci_write()

void pci_write	(	pci_device_t	device,
		uint32_t	field,
		uint32_t	value )

Writes a value to a field in the configuration space.

Parameters

device	the PCI device
field	the field to update
value	the new value for the field