Boot-to-ramdisk image generation scripts
[minix3.git] / lib / libpci / pci_device.c
blob193cd1637231909bea8f09684fea8d7c72adde61
1 /* $NetBSD: pci_device.c,v 1.2 2003/03/08 09:53:45 lukem Exp $ */
3 /*
4 * Copyright 2001 Wasabi Systems, Inc.
5 * All rights reserved.
7 * Written by Jason R. Thorpe for Wasabi Systems, Inc.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed for the NetBSD Project by
20 * Wasabi Systems, Inc.
21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
22 * or promote products derived from this software without specific prior
23 * written permission.
25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
35 * POSSIBILITY OF SUCH DAMAGE.
39 * Interface to PCI config space registers for a specific PCI device.
42 #include <sys/cdefs.h>
43 __RCSID("$NetBSD: pci_device.c,v 1.2 2003/03/08 09:53:45 lukem Exp $");
45 #include <sys/types.h>
46 #include <sys/ioctl.h>
48 #include <pci.h>
50 #include <dev/pci/pciio.h>
53 * pcidev_conf_read:
55 * Read a config word for a given bus/device/function.
57 int
58 pcidev_conf_read(int fd, u_int reg, uint32_t *valp)
60 struct pciio_cfgreg r;
61 int rv;
63 r.reg = reg;
65 rv = ioctl(fd, PCI_IOC_CFGREAD, &r);
66 if (rv == -1) {
67 /* errno already set. */
68 return (-1);
71 *valp = r.val;
72 return (0);
76 * pcidev_conf_write:
78 * Write a config word for a given bus/device/function.
80 int
81 pcidev_conf_write(int fd, u_int reg, uint32_t val)
83 struct pciio_cfgreg r;
85 r.reg = reg;
86 r.val = val;
88 return (ioctl(fd, PCI_IOC_CFGWRITE, &r));