From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <4b8975be661bc48197d5ce424643c9a5@plan9.bell-labs.com>
To: 9fans@cse.psu.edu
Subject: Re: [9fans] Standalone cpu/auth..
From: David Gordon Hogan <dhog@plan9.bell-labs.com>
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Date: Wed, 15 May 2002 21:11:20 -0400
Topicbox-Message-UUID: 93d93f26-eaca-11e9-9e20-41e7f4b1d025

> I just tried the cpu/auth standalone on a dual PIII with Intel
> server mother board. At boot time, i see the message..
> .....
> pcirouting: South bridge FFFF, FFFF not found
> .....
> pcirouting: Can't find south bridge PCI 255.37.7

The first message is ``impossible''.  I'd love to know
why it's happening.  The second one is just improbable.
What does the "pci" command report?  Also, here is
a program for dumping the contents of the BIOS PCI
routing table, please save it as "pcir.c", compile and
run, then send me the output:

#include <u.h>
#include <libc.h>

typedef struct Router Router;
typedef struct Slot Slot;

struct Slot
{
	uchar	bus;			// Pci bus number
	uchar	dev;			// Pci device number
	uchar	maps[12];		// Avoid structs!  Link and mask.
	uchar	slot;			// Add-in/built-in slot
	uchar	reserved;
};

struct Router
{
	uchar	signature[4];	// Routing table signature
	uchar	version[2];	// Version number
	uchar	size[2];		// Total table size
	uchar	bus;			// Interrupt router bus number
	uchar	devfn;		// Router's devfunc
	uchar	pciirqs[2];		// Exclusive PCI irqs
	uchar	compat[4];	// Compatible PCI interrupt router
	uchar	miniport[4];	// Miniport data
	uchar	reserved[11];
	uchar	checksum;
};

#define	GET2(p)		((p)[0]|((p)[1]<<8))
#define	DEV(devfn)	(devfn>>3)
#define	FN(devfn)		(devfn&7)

void
main(int argc, char *argv[])
{
	Slot *e;
	Router *r;
	int fd, size, i;
	char file[64];
	uchar *buf, *p, *ep, *m;

	USED(argc, argv);

	snprint(file, sizeof file, "#p/%d/mem", getpid());
	fd = open(file, OREAD);
	if(fd < 0)
		sysfatal("open proc mem");
	if(seek(fd, 0x80000000|0xf0000, 0) < 0)
		sysfatal("seek proc mem");

	buf = malloc(0x10000);
	if(read(fd, buf, 0x10000) != 0x10000)
		sysfatal("read proc mem");

	ep = buf+0x10000;
	for(p = buf; p < ep; p += 16)
		if(p[0] == '$' && p[1] == 'P' && p[2] == 'I' && p[3] == 'R')
			break;
	if(p == ep) {
		fprint(2, "pcir: PCI routing table not found\n");
		exits("not found");
	}

	r = (Router *)p;

	print("PCI interrupt routing table version %d.%d at %.5ux\n",
		r->version[1], r->version[0], p-buf+0xf0000);
	print("South Bridge %d.%d.%d, irqs %.4uX compat %.4uX/%.4uX\n",
		r->bus, DEV(r->devfn), FN(r->devfn), GET2(r->pciirqs),
		GET2(&r->compat[0]), GET2(&r->compat[2]));
	print("miniport data: %.2uX %.2uX %.2uX %.2uX\n",
		r->miniport[0], r->miniport[1], r->miniport[2], r->miniport[3]);
	size = GET2(r->size);
	for(e = (Slot *)&r[1]; (uchar *)e < p + size; e++) {
		print("%d.%d.%d %.2uX:\t", e->bus, DEV(e->dev), FN(e->dev), e->slot);
		for(i = 0; i != 4; i++) {
			m = &e->maps[i * 3];
			print("[%d] %.2uX %.4uX ", i, m[0], (m[2] << 8)|m[1]);
		}
		print("\n");
	}

	exits(nil);
}