68 lines
2.2 KiB
C
68 lines
2.2 KiB
C
/* $OpenBSD: pciprobe.c,v 1.11 2023/07/24 14:02:36 jsg Exp $ */
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/*
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* Copyright (c) 1997 Tobias Weingartner
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include <sys/param.h>
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#include <stand/boot/bootarg.h>
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#include <machine/biosvar.h>
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#include "libsa.h"
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#define PCI_SIG 0x20494350 /* PCI Signature */
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void
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pciprobe(void)
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{
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bios_pciinfo_t bpi;
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u_int32_t hw_chars, rev, rc, sig;
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u_int32_t entry32, lastbus;
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/* PCI BIOS v2.0c+ - Installation Check */
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__asm volatile(DOINT(0x1A)
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: "=a" (hw_chars), "=b" (rev), "=c" (lastbus),
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"=d" (sig), "=D" (entry32), "=@ccc" (rc)
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: "0" (0xB101), "4" (0x0)
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: "cc");
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if (rc & 0xff || hw_chars & 0xff00)
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return;
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if (sig != PCI_SIG)
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return;
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printf(" pci");
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#ifdef DEBUG
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printf("[V%d.%d, %x 0x%x %d]", (rev>>8)&0xFF, (rev&0xFF),
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hw_chars, entry32, (rc>>8)&0xFF);
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#endif
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bpi.pci_chars = hw_chars & 0xFFFF;
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bpi.pci_rev = rev & 0xFFFF;
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bpi.pci_entry32 = entry32;
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bpi.pci_lastbus = lastbus & 0xFF;
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addbootarg(BOOTARG_PCIINFO, sizeof(bios_pciinfo_t), &bpi);
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}
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