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
29/*
30 * Obtain memory configuration information from the BIOS
31 */
32#include <stand.h>
33#include <sys/param.h>
34#include <sys/linker.h>
35#include <sys/queue.h>
36#include <sys/stddef.h>
37#include <machine/metadata.h>
38#include <machine/pc/bios.h>
39#include "bootstrap.h"
40#include "libi386.h"
41#include "btxv86.h"
42
43struct smap_buf {
44	struct bios_smap	smap;
45	uint32_t		xattr;	/* Extended attribute from ACPI 3.0 */
46	STAILQ_ENTRY(smap_buf)	bufs;
47};
48
49#define	SMAP_BUFSIZE		offsetof(struct smap_buf, bufs)
50
51static struct bios_smap		*smapbase;
52static uint32_t			*smapattr;
53static u_int			smaplen;
54
55void
56bios_getsmap(void)
57{
58	struct smap_buf		buf;
59	STAILQ_HEAD(smap_head, smap_buf) head =
60	    STAILQ_HEAD_INITIALIZER(head);
61	struct smap_buf		*cur, *next;
62	u_int			n, x;
63
64	STAILQ_INIT(&head);
65	n = 0;
66	x = 0;
67	v86.ebx = 0;
68	do {
69		v86.ctl = V86_FLAGS;
70		v86.addr = 0x15;
71		v86.eax = 0xe820;	/* int 0x15 function 0xe820 */
72		v86.ecx = SMAP_BUFSIZE;
73		v86.edx = SMAP_SIG;
74		v86.es = VTOPSEG(&buf);
75		v86.edi = VTOPOFF(&buf);
76		v86int();
77		if (V86_CY(v86.efl) || v86.eax != SMAP_SIG ||
78		    v86.ecx < sizeof(buf.smap) || v86.ecx > SMAP_BUFSIZE)
79			break;
80
81		next = malloc(sizeof(*next));
82		if (next == NULL)
83			break;
84		next->smap = buf.smap;
85		if (v86.ecx == SMAP_BUFSIZE) {
86			next->xattr = buf.xattr;
87			x++;
88		}
89		STAILQ_INSERT_TAIL(&head, next, bufs);
90		n++;
91	} while (v86.ebx != 0);
92	smaplen = n;
93
94	if (smaplen > 0) {
95		smapbase = malloc(smaplen * sizeof(*smapbase));
96		if (smapbase != NULL) {
97			n = 0;
98			STAILQ_FOREACH(cur, &head, bufs)
99				smapbase[n++] = cur->smap;
100		}
101		if (smaplen == x) {
102			smapattr = malloc(smaplen * sizeof(*smapattr));
103			if (smapattr != NULL) {
104				n = 0;
105				STAILQ_FOREACH(cur, &head, bufs)
106					smapattr[n++] = cur->xattr &
107					    SMAP_XATTR_MASK;
108			}
109		} else
110			smapattr = NULL;
111		cur = STAILQ_FIRST(&head);
112		while (cur != NULL) {
113			next = STAILQ_NEXT(cur, bufs);
114			free(cur);
115			cur = next;
116		}
117	}
118}
119
120void
121bios_addsmapdata(struct preloaded_file *kfp)
122{
123	size_t			size;
124
125	if (smapbase == NULL || smaplen == 0)
126		return;
127	size = smaplen * sizeof(*smapbase);
128	file_addmetadata(kfp, MODINFOMD_SMAP, size, smapbase);
129	if (smapattr != NULL) {
130		size = smaplen * sizeof(*smapattr);
131		file_addmetadata(kfp, MODINFOMD_SMAP_XATTR, size, smapattr);
132	}
133}
134
135COMMAND_SET(smap, "smap", "show BIOS SMAP", command_smap);
136
137static int
138command_smap(int argc __unused, char *argv[] __unused)
139{
140	u_int			i;
141
142	if (smapbase == NULL || smaplen == 0)
143		return (CMD_ERROR);
144	if (smapattr != NULL)
145		for (i = 0; i < smaplen; i++)
146			printf("SMAP type=%02x base=%016llx len=%016llx attr=%02x\n",
147			    (unsigned int)smapbase[i].type,
148			    (unsigned long long)smapbase[i].base,
149			    (unsigned long long)smapbase[i].length,
150			    (unsigned int)smapattr[i]);
151	else
152		for (i = 0; i < smaplen; i++)
153			printf("SMAP type=%02x base=%016llx len=%016llx\n",
154			    (unsigned int)smapbase[i].type,
155			    (unsigned long long)smapbase[i].base,
156			    (unsigned long long)smapbase[i].length);
157	return (CMD_OK);
158}
159