biossmap.c revision 225736 
1/*-
2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: stable/9/sys/boot/i386/libi386/biossmap.c 191111 2009-04-15 17:31:22Z jkim $");
29
30/*
31 * Obtain memory configuration information from the BIOS
32 */
33#include <stand.h>
34#include <sys/param.h>
35#include <sys/linker.h>
36#include <sys/queue.h>
37#include <sys/stddef.h>
38#include <machine/metadata.h>
39#include <machine/psl.h>
40#include <machine/pc/bios.h>
41#include "bootstrap.h"
42#include "libi386.h"
43#include "btxv86.h"
44
45#define	V86_CY(x)	((x) & PSL_C)
46
47struct smap_buf {
48	struct bios_smap	smap;
49	uint32_t		xattr;	/* Extended attribute from ACPI 3.0 */
50	STAILQ_ENTRY(smap_buf)	bufs;
51};
52
53#define	SMAP_BUFSIZE		offsetof(struct smap_buf, bufs)
54
55static struct bios_smap		*smapbase;
56static uint32_t			*smapattr;
57static u_int			smaplen;
58
59void
60bios_getsmap(void)
61{
62	struct smap_buf		buf;
63	STAILQ_HEAD(smap_head, smap_buf) head =
64	    STAILQ_HEAD_INITIALIZER(head);
65	struct smap_buf		*cur, *next;
66	u_int			n, x;
67
68	STAILQ_INIT(&head);
69	n = 0;
70	x = 0;
71	v86.ebx = 0;
72	do {
73		v86.ctl = V86_FLAGS;
74		v86.addr = 0x15;
75		v86.eax = 0xe820;	/* int 0x15 function 0xe820 */
76		v86.ecx = SMAP_BUFSIZE;
77		v86.edx = SMAP_SIG;
78		v86.es = VTOPSEG(&buf);
79		v86.edi = VTOPOFF(&buf);
80		v86int();
81		if (V86_CY(v86.efl) || v86.eax != SMAP_SIG ||
82		    v86.ecx < sizeof(buf.smap) || v86.ecx > SMAP_BUFSIZE)
83			break;
84
85		next = malloc(sizeof(*next));
86		if (next == NULL)
87			break;
88		next->smap = buf.smap;
89		if (v86.ecx == SMAP_BUFSIZE) {
90			next->xattr = buf.xattr;
91			x++;
92		}
93		STAILQ_INSERT_TAIL(&head, next, bufs);
94		n++;
95	} while (v86.ebx != 0);
96	smaplen = n;
97
98	if (smaplen > 0) {
99		smapbase = malloc(smaplen * sizeof(*smapbase));
100		if (smapbase != NULL) {
101			n = 0;
102			STAILQ_FOREACH(cur, &head, bufs)
103				smapbase[n++] = cur->smap;
104		}
105		if (smaplen == x) {
106			smapattr = malloc(smaplen * sizeof(*smapattr));
107			if (smapattr != NULL) {
108				n = 0;
109				STAILQ_FOREACH(cur, &head, bufs)
110					smapattr[n++] = cur->xattr &
111					    SMAP_XATTR_MASK;
112			}
113		} else
114			smapattr = NULL;
115		cur = STAILQ_FIRST(&head);
116		while (cur != NULL) {
117			next = STAILQ_NEXT(cur, bufs);
118			free(cur);
119			cur = next;
120		}
121	}
122}
123
124void
125bios_addsmapdata(struct preloaded_file *kfp)
126{
127	size_t			size;
128
129	if (smapbase == NULL || smaplen == 0)
130		return;
131	size = smaplen * sizeof(*smapbase);
132	file_addmetadata(kfp, MODINFOMD_SMAP, size, smapbase);
133	if (smapattr != NULL) {
134		size = smaplen * sizeof(*smapattr);
135		file_addmetadata(kfp, MODINFOMD_SMAP_XATTR, size, smapattr);
136	}
137}
138
139COMMAND_SET(smap, "smap", "show BIOS SMAP", command_smap);
140
141static int
142command_smap(int argc, char *argv[])
143{
144	u_int			i;
145
146	if (smapbase == NULL || smaplen == 0)
147		return (CMD_ERROR);
148	if (smapattr != NULL)
149		for (i = 0; i < smaplen; i++)
150			printf("SMAP type=%02x base=%016llx len=%016llx attr=%02x\n",
151			    (unsigned int)smapbase[i].type,
152			    (unsigned long long)smapbase[i].base,
153			    (unsigned long long)smapbase[i].length,
154			    (unsigned int)smapattr[i]);
155	else
156		for (i = 0; i < smaplen; i++)
157			printf("SMAP type=%02x base=%016llx len=%016llx\n",
158			    (unsigned int)smapbase[i].type,
159			    (unsigned long long)smapbase[i].base,
160			    (unsigned long long)smapbase[i].length);
161	return (CMD_OK);
162}
163