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

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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: head/sys/boot/i386/libi386/biossmap.c 179631 2008-06-07 03:07:32Z jhb $");
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 <machine/metadata.h>
37#include <machine/pc/bios.h>
38#include "bootstrap.h"
39#include "libi386.h"
40#include "btxv86.h"
41
42static struct {
43 struct bios_smap _smap_entry;
44 char pad[8]; /* Bad BIOS writer, no cookie! */
45} smap;
46
47static struct bios_smap *smapbase;
48static int smaplen;
49
50void
51bios_getsmap(void)
52{
53 int n;
54
55 n = 0;
56 smaplen = 0;
57 /* Count up segments in system memory map */
58 v86.ebx = 0;
59 do {
60 v86.ctl = V86_FLAGS;
61 v86.addr = 0x15; /* int 0x15 function 0xe820*/
62 v86.eax = 0xe820;
63 v86.ecx = sizeof(struct bios_smap);
64 v86.edx = SMAP_SIG;
65 v86.es = VTOPSEG(&smap);
66 v86.edi = VTOPOFF(&smap);
67 v86int();
68 if ((v86.efl & 1) || (v86.eax != SMAP_SIG))
69 break;
70 n++;
71 } while (v86.ebx != 0);
72 if (n == 0)
73 return;
74 n += 10; /* spare room */
75 smapbase = malloc(n * sizeof(*smapbase));
76
77 /* Save system memory map */
78 v86.ebx = 0;
79 do {
80 v86.ctl = V86_FLAGS;
81 v86.addr = 0x15; /* int 0x15 function 0xe820*/
82 v86.eax = 0xe820;
83 v86.ecx = sizeof(struct bios_smap);
84 v86.edx = SMAP_SIG;
85 v86.es = VTOPSEG(&smap);
86 v86.edi = VTOPOFF(&smap);
87 v86int();
88 bcopy(&smap, &smapbase[smaplen], sizeof(struct bios_smap));
89 smaplen++;
90 if ((v86.efl & 1) || (v86.eax != SMAP_SIG))
91 break;
92 } while (v86.ebx != 0 && smaplen < n);
93}
94
95void
96bios_addsmapdata(struct preloaded_file *kfp)
97{
98 int len;
99
100 if (smapbase == 0 || smaplen == 0)
101 return;
102 len = smaplen * sizeof(*smapbase);
103 file_addmetadata(kfp, MODINFOMD_SMAP, len, smapbase);
104}
105
106COMMAND_SET(smap, "smap", "show BIOS SMAP", command_smap);
107
108static int
109command_smap(int argc, char *argv[])
110{
111 int i;
112
113 if (smapbase == 0 || smaplen == 0)
114 return (CMD_ERROR);
115 for (i = 0; i < smaplen; i++)
116 printf("SMAP type=%02x base=%016llx len=%016llx\n",
117 smapbase[i].type, smapbase[i].base, smapbase[i].length);
118 return (CMD_OK);
119}