autoconf.c

早期freebsd实现

/*
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This software was developed by the Computer Systems Engineering group
 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
 * contributed to Berkeley.
 *
 * All advertising materials mentioning features or use of this software
 * must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Lawrence Berkeley Laboratory.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)autoconf.c	8.4 (Berkeley) 10/1/93
 *
 * from: $Header: autoconf.c,v 1.38 93/10/01 21:24:51 torek Exp $ (LBL)
 */

#include <sys/param.h>
#include <sys/map.h>
#include <sys/buf.h>
#include <sys/disklabel.h>
#include <sys/device.h>
#include <sys/disk.h>
#include <sys/dkstat.h>
#include <sys/conf.h>
#include <sys/dmap.h>
#include <sys/reboot.h>
#include <sys/socket.h>
#include <sys/systm.h>

#include <net/if.h>

#include <machine/autoconf.h>
#include <machine/bsd_openprom.h>
#include <machine/cpu.h>

/*
 * The following several variables are related to
 * the configuration process, and are used in initializing
 * the machine.
 */
int	cold;		/* if 1, still working on cold-start */
int	dkn;		/* number of iostat dk numbers assigned so far */
int	fbnode;		/* node ID of ROM's console frame buffer */
int	optionsnode;	/* node ID of ROM's options */

extern	struct promvec *promvec;

static	int rootnode;
int	findroot __P((void));
void	setroot __P((void));
static	int getstr __P((char *, int));
static	int findblkmajor __P((struct dkdevice *));
static	struct device *getdisk __P((char *, int, int, dev_t *));

struct	bootpath bootpath[8];

/*
 * Most configuration on the SPARC is done by matching OPENPROM Forth
 * device names with our internal names.
 */
int
matchbyname(parent, cf, aux)
	struct device *parent;
	struct cfdata *cf;
	void *aux;
{

	return (strcmp(cf->cf_driver->cd_name, *(char **)aux) == 0);
}

/*
 * Convert hex ASCII string to a value.  Returns updated pointer.
 * Depends on ASCII order (this *is* machine-dependent code, you know).
 */
static char *
str2hex(str, vp)
	register char *str;
	register int *vp;
{
	register int v, c;

	for (v = 0;; v = v * 16 + c, str++) {
		c = *(u_char *)str;
		if (c <= '9') {
			if ((c -= '0') < 0)
				break;
		} else if (c <= 'F') {
			if ((c -= 'A' - 10) < 10)
				break;
		} else if (c <= 'f') {
			if ((c -= 'a' - 10) < 10)
				break;
		} else
			break;
	}
	*vp = v;
	return (str);
}

/*
 * locore.s code calls bootstrap() just before calling main(), after double
 * mapping the kernel to high memory and setting up the trap base register.
 * We must finish mapping the kernel properly and glean any bootstrap info.
 */
void
bootstrap()
{
	register char *cp, *pp;
	register struct bootpath *bp;
	int v0val[3];
	int nmmu, ncontext, node;
#ifdef KGDB
	extern int kgdb_debug_panic;
#endif

	node = findroot();
	nmmu = getpropint(node, "mmu-npmg", 128);
	ncontext = getpropint(node, "mmu-nctx", 8);
	pmap_bootstrap(nmmu, ncontext);
#ifdef KGDB
	zs_kgdb_init();			/* XXX */
#endif
	/*
	 * On SS1s, promvec->pv_v0bootargs->ba_argv[1] contains the flags
	 * that were given after the boot command.  On SS2s, pv_v0bootargs
	 * is NULL but *promvec->pv_v2bootargs.v2_bootargs points to
	 * "vmunix -s" or whatever.
	 * ###	DO THIS BEFORE pmap_boostrap?
	 */
	bp = bootpath;
	if (promvec->pv_romvec_vers < 2) {
		/* Grab boot device name and values. */
		cp = (*promvec->pv_v0bootargs)->ba_argv[0];
		if (cp != NULL) {
			/* Kludge something up */
			pp = cp + 2;
			v0val[0] = v0val[1] = v0val[2] = 0;
			if (*pp == '(' &&
			    *(pp = str2hex(++pp, &v0val[0])) == ',' &&
			    *(pp = str2hex(++pp, &v0val[1])) == ',')
				(void)str2hex(++pp, &v0val[2]);

			/* Assume sbus0 */
			strcpy(bp->name, "sbus");
			bp->val[0] = 0;
			++bp;

			if (cp[0] == 'l' && cp[1] == 'e') {
				/* le */
				strcpy(bp->name, "le");
				bp->val[0] = -1;
				bp->val[1] = v0val[0];
			} else {
				/* sd or maybe st; assume espN */
				strcpy(bp->name, "esp");
				bp->val[0] = -1;
				bp->val[1] = v0val[0];

/* XXX map target 0 to 3, 3 to 0. Should really see how the prom is configed */
#define CRAZYMAP(v) ((v) == 3 ? 0 : (v) == 0 ? 3 : (v))

				++bp;
				bp->name[0] = cp[0];
				bp->name[1] = cp[1];
				bp->name[2] = '\0';
				bp->val[0] = CRAZYMAP(v0val[1]);
				bp->val[1] = v0val[2];
			}
		}

		/* Setup pointer to boot flags */
		cp = (*promvec->pv_v0bootargs)->ba_argv[1];
		if (cp == NULL || *cp != '-')
			return;
	} else {
		/* Grab boot path */
		cp = *promvec->pv_v2bootargs.v2_bootpath;
		while (cp != NULL && *cp == '/') {
			/* Step over '/' */
			++cp;
			/* Extract name */
			pp = bp->name;
			while (*cp != '@' && *cp != '/' && *cp != '\0')
				*pp++ = *cp++;
			*pp = '\0';

			if (*cp == '@') {
				cp = str2hex(++cp, &bp->val[0]);
				if (*cp == ',')
					cp = str2hex(++cp, &bp->val[1]);
			}
			++bp;
		}

		/* Setup pointer to boot flags */
		cp = *promvec->pv_v2bootargs.v2_bootargs;
		if (cp == NULL)
			return;
		while (*cp != '-')
			if (*cp++ == '\0')
				return;
	}
	for (;;) {
		switch (*++cp) {

		case '\0':
			return;

		case 'a':
			boothowto |= RB_ASKNAME;
			break;

		case 'b':
			boothowto |= RB_DFLTROOT;
			break;

		case 'd':	/* kgdb - always on zs	XXX */
#ifdef KGDB
			boothowto |= RB_KDB;	/* XXX unused */
			kgdb_debug_panic = 1;
			kgdb_connect(1);
#else
			printf("kernel not compiled with KGDB\n");
#endif
			break;

		case 's':
			boothowto |= RB_SINGLE;
			break;
		}
	}
}

/*
 * Determine mass storage and memory configuration for a machine.
 * We get the PROM's root device and make sure we understand it, then
 * attach it as `mainbus0'.  We also set up to handle the PROM `sync'
 * command.
 */
configure()
{
	register int node;
	register char *cp;
	struct romaux ra;
	void sync_crash();

	node = findroot();
	cp = getpropstring(node, "device_type");
	if (strcmp(cp, "cpu") != 0) {
		printf("PROM root device type = %s\n", cp);
		panic("need CPU as root");
	}
	*promvec->pv_synchook = sync_crash;
	ra.ra_node = node;
	ra.ra_name = cp = "mainbus";
	if (!config_rootfound(cp, (void *)&ra))
		panic("mainbus not configured");
	(void)spl0();
	if (bootdv)
		printf("Found boot device %s\n", bootdv->dv_xname);
	cold = 0;
	setroot();
	swapconf();
	dumpconf();
}

/*
 * Console `sync' command.  SunOS just does a `panic: zero' so I guess
 * no one really wants anything fancy...
 */
void
sync_crash()
{

	panic("PROM sync command");
}

char *
clockfreq(freq)
	register int freq;
{
	register char *p;
	static char buf[10];

	freq /= 1000;
	sprintf(buf, "%d", freq / 1000);
	freq %= 1000;
	if (freq) {
		freq += 1000;	/* now in 1000..1999 */
		p = buf + strlen(buf);
		sprintf(p, "%d", freq);
		*p = '.';	/* now buf = %d.%3d */
	}
	return (buf);
}

/* ARGSUSED */
static int
mbprint(aux, name)
	void *aux;
	char *name;
{
	register struct romaux *ra = aux;

	if (name)
		printf("%s at %s", ra->ra_name, name);
	if (ra->ra_paddr)
		printf(" %saddr 0x%x", ra->ra_iospace ? "io" : "",
		    (int)ra->ra_paddr);
	return (UNCONF);
}

int
findroot()
{
	register int node;

	if ((node = rootnode) == 0 && (node = nextsibling(0)) == 0)
		panic("no PROM root device");
	rootnode = node;
	return (node);
}

/*
 * Given a `first child' node number, locate the node with the given name.
 * Return the node number, or 0 if not found.
 */
int
findnode(first, name)
	int first;
	register char *name;
{
	register int node;

	for (node = first; node; node = nextsibling(node))
		if (strcmp(getpropstring(node, "name"), name) == 0)
			return (node);
	return (0);
}

/*
 * Fill in a romaux.  Returns 1 on success, 0 if the register property
 * was not the right size.
 */
int
romprop(rp, cp, node)
	register struct romaux *rp;
	const char *cp;
	register int node;
{
	register int len;
	union { char regbuf[64]; int ireg[3]; } u;
	static const char pl[] = "property length";

	len = getprop(node, "reg", (void *)u.regbuf, sizeof u.regbuf);
	if (len < 12) {
		printf("%s \"reg\" %s = %d (need 12)\n", cp, pl, len);
		return (0);
	}
	if (len > 12)
		printf("warning: %s \"reg\" %s %d > 12, excess ignored\n",
		    cp, pl, len);
	rp->ra_node = node;
	rp->ra_name = cp;
	rp->ra_iospace = u.ireg[0];
	rp->ra_paddr = (caddr_t)u.ireg[1];
	rp->ra_len = u.ireg[2];
	rp->ra_vaddr = (caddr_t)getpropint(node, "address", 0);
	len = getprop(node, "intr", (void *)&rp->ra_intr, sizeof rp->ra_intr);
	if (len == -1)
		len = 0;
	if (len & 7) {
		printf("%s \"intr\" %s = %d (need multiple of 8)\n",
		    cp, pl, len);
		len = 0;
	}
	rp->ra_nintr = len >>= 3;
	/* SPARCstation interrupts are not hardware-vectored */
	while (--len >= 0) {
		if (rp->ra_intr[len].int_vec) {
			printf("WARNING: %s interrupt %d has nonzero vector\n",
			    cp, len);
			break;
		}
	}
	return (1);
}

/*
 * Attach the mainbus.
 *
 * Our main job is to attach the CPU (the root node we got in configure())
 * and iterate down the list of `mainbus devices' (children of that node).
 * We also record the `node id' of the default frame buffer, if any.
 */
static void
mainbus_attach(parent, dev, aux)
	struct device *parent, *dev;
	void *aux;
{
	register int node0, node;
	register const char *cp, *const *ssp, *sp;
#define L1A_HACK		/* XXX hack to allow L1-A during autoconf */
#ifdef L1A_HACK
	int nzs = 0, audio = 0;
#endif
	struct romaux ra;
	static const char *const special[] = {
		/* find these first (end with empty string) */
		"memory-error",	/* as early as convenient, in case of error */
		"eeprom",
		"counter-timer",
		"",

		/* ignore these (end with NULL) */
		"aliases",
		"interrupt-enable",
		"memory",
		"openprom",
		"options",
		"packages",
		"virtual-memory",
		NULL
	};

	printf("\n");

	/* configure the cpu */
	node = ((struct romaux *)aux)->ra_node;
	ra.ra_node = node;
	ra.ra_name = cp = "cpu";
	ra.ra_paddr = 0;
	config_found(dev, (void *)&ra, mbprint);

	/* remember which frame buffer, if any, is to be /dev/fb */
	fbnode = getpropint(node, "fb", 0);

	/* Find the "options" node */
	node0 = firstchild(node);
	optionsnode = findnode(node0, "options");
	if (optionsnode == 0)
		panic("no options in OPENPROM");

	/* Start at the beginning of the bootpath */
	ra.ra_bp = bootpath;

	/*
	 * Locate and configure the ``early'' devices.  These must be
	 * configured before we can do the rest.  For instance, the
	 * EEPROM contains the Ethernet address for the LANCE chip.
	 * If the device cannot be located or configured, panic.
	 */
	for (ssp = special; *(sp = *ssp) != 0; ssp++) {
		if ((node = findnode(node0, sp)) == 0) {
			printf("could not find %s in OPENPROM\n", sp);
			panic(sp);
		}
		if (!romprop(&ra, sp, node) ||
		    !config_found(dev, (void *)&ra, mbprint))
			panic(sp);
	}

	/*
	 * Configure the rest of the devices, in PROM order.  Skip
	 * PROM entries that are not for devices, or which must be
	 * done before we get here.
	 */
	for (node = node0; node; node = nextsibling(node)) {
		cp = getpropstring(node, "name");
		for (ssp = special; (sp = *ssp) != NULL; ssp++)
			if (strcmp(cp, sp) == 0)
				break;
		if (sp == NULL && romprop(&ra, cp, node)) {
#ifdef L1A_HACK
			if (strcmp(cp, "audio") == 0)
				audio = 1;
			if (strcmp(cp, "zs") == 0)
				nzs++;
			if (audio && nzs >= 2)
				(void) splx(11 << 8);	/* XXX */
#endif
			(void) config_found(dev, (void *)&ra, mbprint);
		}
	}
}

struct cfdriver mainbuscd =
    { NULL, "mainbus", matchbyname, mainbus_attach,
      DV_DULL, sizeof(struct device) };

/*
 * findzs() is called from the zs driver (which is, at least in theory,
 * generic to any machine with a Zilog ZSCC chip).  It should return the
 * address of the corresponding zs channel.  It may not fail, and it
 * may be called before the VM code can be used.  Here we count on the
 * FORTH PROM to map in the required zs chips.
 */
void *
findzs(zs)
	int zs;
{
	register int node, addr;