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("$FreeBSD$");
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/pc/bios.h>
40 #include "bootstrap.h"
41 #include "libi386.h"
42 #include "btxv86.h"
43
44 struct smap_buf {
45 struct bios_smap smap;
46 uint32_t xattr; /* Extended attribute from ACPI 3.0 */
47 STAILQ_ENTRY(smap_buf) bufs;
48 };
49
50 #define SMAP_BUFSIZE offsetof(struct smap_buf, bufs)
51
52 static struct bios_smap *smapbase;
53 static uint32_t *smapattr;
54 static u_int smaplen;
55
56 void
bios_getsmap(void)57 bios_getsmap(void)
58 {
59 struct smap_buf buf;
60 STAILQ_HEAD(smap_head, smap_buf) head =
61 STAILQ_HEAD_INITIALIZER(head);
62 struct smap_buf *cur, *next;
63 u_int n, x;
64
65 STAILQ_INIT(&head);
66 n = 0;
67 x = 0;
68 v86.ebx = 0;
69 do {
70 v86.ctl = V86_FLAGS;
71 v86.addr = 0x15;
72 v86.eax = 0xe820; /* int 0x15 function 0xe820 */
73 v86.ecx = SMAP_BUFSIZE;
74 v86.edx = SMAP_SIG;
75 v86.es = VTOPSEG(&buf);
76 v86.edi = VTOPOFF(&buf);
77 v86int();
78 if (V86_CY(v86.efl) || v86.eax != SMAP_SIG ||
79 v86.ecx < sizeof(buf.smap) || v86.ecx > SMAP_BUFSIZE)
80 break;
81
82 next = malloc(sizeof(*next));
83 if (next == NULL)
84 break;
85 next->smap = buf.smap;
86 if (v86.ecx == SMAP_BUFSIZE) {
87 next->xattr = buf.xattr;
88 x++;
89 }
90 STAILQ_INSERT_TAIL(&head, next, bufs);
91 n++;
92 } while (v86.ebx != 0);
93 smaplen = n;
94
95 if (smaplen > 0) {
96 smapbase = malloc(smaplen * sizeof(*smapbase));
97 if (smapbase != NULL) {
98 n = 0;
99 STAILQ_FOREACH(cur, &head, bufs)
100 smapbase[n++] = cur->smap;
101 }
102 if (smaplen == x) {
103 smapattr = malloc(smaplen * sizeof(*smapattr));
104 if (smapattr != NULL) {
105 n = 0;
106 STAILQ_FOREACH(cur, &head, bufs)
107 smapattr[n++] = cur->xattr &
108 SMAP_XATTR_MASK;
109 }
110 } else
111 smapattr = NULL;
112 cur = STAILQ_FIRST(&head);
113 while (cur != NULL) {
114 next = STAILQ_NEXT(cur, bufs);
115 free(cur);
116 cur = next;
117 }
118 }
119 }
120
121 void
bios_addsmapdata(struct preloaded_file * kfp)122 bios_addsmapdata(struct preloaded_file *kfp)
123 {
124 size_t size;
125
126 if (smapbase == NULL || smaplen == 0)
127 return;
128 size = smaplen * sizeof(*smapbase);
129 file_addmetadata(kfp, MODINFOMD_SMAP, size, smapbase);
130 if (smapattr != NULL) {
131 size = smaplen * sizeof(*smapattr);
132 file_addmetadata(kfp, MODINFOMD_SMAP_XATTR, size, smapattr);
133 }
134 }
135
136 COMMAND_SET(smap, "smap", "show BIOS SMAP", command_smap);
137
138 static int
command_smap(int argc,char * argv[])139 command_smap(int argc, char *argv[])
140 {
141 u_int i;
142
143 if (smapbase == NULL || smaplen == 0)
144 return (CMD_ERROR);
145 if (smapattr != NULL)
146 for (i = 0; i < smaplen; i++)
147 printf("SMAP type=%02x base=%016llx len=%016llx attr=%02x\n",
148 (unsigned int)smapbase[i].type,
149 (unsigned long long)smapbase[i].base,
150 (unsigned long long)smapbase[i].length,
151 (unsigned int)smapattr[i]);
152 else
153 for (i = 0; i < smaplen; i++)
154 printf("SMAP type=%02x base=%016llx len=%016llx\n",
155 (unsigned int)smapbase[i].type,
156 (unsigned long long)smapbase[i].base,
157 (unsigned long long)smapbase[i].length);
158 return (CMD_OK);
159 }
160