1 /* $OpenBSD: pciprobe.c,v 1.8 2004/03/09 19:12:13 tom Exp $ */
2
3 /*
4 * Copyright (c) 1997 Tobias Weingartner
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 */
29
30 #include <sys/param.h>
31 #include <stand/boot/bootarg.h>
32 #include <machine/biosvar.h>
33 #include "libsa.h"
34
35 #define PCI_SIG 0x20494350 /* PCI Signature */
36
37 void
38 pciprobe(void)
39 {
40 bios_pciinfo_t bpi;
41 u_int32_t hw_chars, rev, rc, sig;
42 u_int32_t entry32;
43
44 /* PCI BIOS v2.0c+ - Installation Check */
45 __asm __volatile(DOINT(0x1A) "; shll $8,%2; setc %b2"
46 : "=a" (hw_chars), "=b" (rev), "=c" (rc),
47 "=d" (sig), "=D" (entry32)
48 : "0" (0xB101), "4" (0x0)
49 : "cc");
50
51 if (rc & 0xff00 || hw_chars & 0xff00)
52 return;
53 if (sig != PCI_SIG)
54 return;
55
56 printf(" pci");
57 #ifdef DEBUG
58 printf("[V%d.%d, %x 0x%x %d]", (rev>>8)&0xFF, (rev&0xFF),
59 hw_chars, entry32, (rc>>8)&0xFF);
60 #endif
61
62 bpi.pci_chars = hw_chars & 0xFFFF;
63 bpi.pci_rev = rev & 0xFFFF;
64 bpi.pci_entry32 = entry32;
65 bpi.pci_lastbus = (rc>>8) & 0xFF;
66
67 addbootarg(BOOTARG_PCIINFO, sizeof(bios_pciinfo_t), &bpi);
68 }