config root man

/*-
 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
 * All rights reserved.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/boot/i386/libi386/biossmap.c 229501 2012-01-04 16:39:39Z jhb $");

/*
 * Obtain memory configuration information from the BIOS
 */
#include <stand.h>
#include <sys/param.h>
#include <sys/linker.h>
#include <sys/queue.h>
#include <sys/stddef.h>
#include <machine/metadata.h>
#include <machine/pc/bios.h>
#include "bootstrap.h"
#include "libi386.h"
#include "btxv86.h"

struct smap_buf {
	struct bios_smap	smap;
	uint32_t		xattr;	/* Extended attribute from ACPI 3.0 */
	STAILQ_ENTRY(smap_buf)	bufs;
};

#define	SMAP_BUFSIZE		offsetof(struct smap_buf, bufs)

static struct bios_smap		*smapbase;
static uint32_t			*smapattr;
static u_int			smaplen;

void
bios_getsmap(void)
{
	struct smap_buf		buf;
	STAILQ_HEAD(smap_head, smap_buf) head =
	    STAILQ_HEAD_INITIALIZER(head);
	struct smap_buf		*cur, *next;
	u_int			n, x;

	STAILQ_INIT(&head);
	n = 0;
	x = 0;
	v86.ebx = 0;
	do {
		v86.ctl = V86_FLAGS;
		v86.addr = 0x15;
		v86.eax = 0xe820;	/* int 0x15 function 0xe820 */
		v86.ecx = SMAP_BUFSIZE;
		v86.edx = SMAP_SIG;
		v86.es = VTOPSEG(&buf);
		v86.edi = VTOPOFF(&buf);
		v86int();
		if (V86_CY(v86.efl) || v86.eax != SMAP_SIG ||
		    v86.ecx < sizeof(buf.smap) || v86.ecx > SMAP_BUFSIZE)
			break;

		next = malloc(sizeof(*next));
		if (next == NULL)
			break;
		next->smap = buf.smap;
		if (v86.ecx == SMAP_BUFSIZE) {
			next->xattr = buf.xattr;
			x++;
		}
		STAILQ_INSERT_TAIL(&head, next, bufs);
		n++;
	} while (v86.ebx != 0);
	smaplen = n;

	if (smaplen > 0) {
		smapbase = malloc(smaplen * sizeof(*smapbase));
		if (smapbase != NULL) {
			n = 0;
			STAILQ_FOREACH(cur, &head, bufs)
				smapbase[n++] = cur->smap;
		}
		if (smaplen == x) {
			smapattr = malloc(smaplen * sizeof(*smapattr));
			if (smapattr != NULL) {
				n = 0;
				STAILQ_FOREACH(cur, &head, bufs)
					smapattr[n++] = cur->xattr &
					    SMAP_XATTR_MASK;
			}
		} else
			smapattr = NULL;
		cur = STAILQ_FIRST(&head);
		while (cur != NULL) {
			next = STAILQ_NEXT(cur, bufs);
			free(cur);
			cur = next;
		}
	}
}

void
bios_addsmapdata(struct preloaded_file *kfp)
{
	size_t			size;

	if (smapbase == NULL || smaplen == 0)
		return;
	size = smaplen * sizeof(*smapbase);
	file_addmetadata(kfp, MODINFOMD_SMAP, size, smapbase);
	if (smapattr != NULL) {
		size = smaplen * sizeof(*smapattr);
		file_addmetadata(kfp, MODINFOMD_SMAP_XATTR, size, smapattr);
	}
}

COMMAND_SET(smap, "smap", "show BIOS SMAP", command_smap);

static int
command_smap(int argc, char *argv[])
{
	u_int			i;

	if (smapbase == NULL || smaplen == 0)
		return (CMD_ERROR);
	if (smapattr != NULL)
		for (i = 0; i < smaplen; i++)
			printf("SMAP type=%02x base=%016llx len=%016llx attr=%02x\n",
			    (unsigned int)smapbase[i].type,
			    (unsigned long long)smapbase[i].base,
			    (unsigned long long)smapbase[i].length,
			    (unsigned int)smapattr[i]);
	else
		for (i = 0; i < smaplen; i++)
			printf("SMAP type=%02x base=%016llx len=%016llx\n",
			    (unsigned int)smapbase[i].type,
			    (unsigned long long)smapbase[i].base,
			    (unsigned long long)smapbase[i].length);
	return (CMD_OK);
}