2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
26 * $FreeBSD: src/sys/boot/i386/libi386/biossmap.c,v 1.2 2003/08/25 23:28:31 obrien Exp $
30 * Obtain memory configuration information from the BIOS
33 #include <sys/param.h>
34 #include <sys/linker.h>
35 #include <machine/metadata.h>
36 #include "bootstrap.h"
40 #define SMAPSIG 0x534D4150
48 static struct smap smap;
50 static struct smap *smapbase;
60 /* Count up segments in system memory map */
64 v86.addr = 0x15; /* int 0x15 function 0xe820*/
66 v86.ecx = sizeof(struct smap);
68 v86.es = VTOPSEG(&smap);
69 v86.edi = VTOPOFF(&smap);
71 if ((v86.efl & 1) || (v86.eax != SMAPSIG))
74 } while (v86.ebx != 0);
77 n += 10; /* spare room */
78 smapbase = malloc(n * sizeof(*smapbase));
80 /* Save system memory map */
84 v86.addr = 0x15; /* int 0x15 function 0xe820*/
86 v86.ecx = sizeof(struct smap);
88 v86.es = VTOPSEG(&smapbase[smaplen]);
89 v86.edi = VTOPOFF(&smapbase[smaplen]);
92 if ((v86.efl & 1) || (v86.eax != SMAPSIG))
94 } while (v86.ebx != 0 && smaplen < n);
97 bios_addsmapdata(struct preloaded_file *kfp)
101 if (smapbase == NULL || smaplen == 0)
103 len = smaplen * sizeof(*smapbase);
104 file_addmetadata(kfp, MODINFOMD_SMAP, len, smapbase);
105 /* Temporary compatibility with older development kernels */
106 file_addmetadata(kfp, 0x0009, len, smapbase);