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
43 struct 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
51 static struct bios_smap *smapbase;
52 static uint32_t *smapattr;
53 static u_int smaplen;
54
55 void
bios_getsmap(void)56 bios_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
120 void
bios_addsmapdata(struct preloaded_file * kfp)121 bios_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
135 COMMAND_SET(smap, "smap", "show BIOS SMAP", command_smap);
136
137 static int
command_smap(int argc __unused,char * argv[]__unused)138 command_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