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