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 $
27 * $DragonFly: src/sys/boot/pc32/libi386/biossmap.c,v 1.2 2003/11/22 19:30:55 asmodai Exp $
31 * Obtain memory configuration information from the BIOS
34 #include <sys/param.h>
35 #include <sys/linker.h>
36 #include <machine/metadata.h>
37 #include "bootstrap.h"
41 #define SMAPSIG 0x534D4150
49 static struct smap smap;
51 static struct smap *smapbase;
61 /* Count up segments in system memory map */
65 v86.addr = 0x15; /* int 0x15 function 0xe820*/
67 v86.ecx = sizeof(struct smap);
69 v86.es = VTOPSEG(&smap);
70 v86.edi = VTOPOFF(&smap);
72 if ((v86.efl & 1) || (v86.eax != SMAPSIG))
75 } while (v86.ebx != 0);
78 n += 10; /* spare room */
79 smapbase = malloc(n * sizeof(*smapbase));
81 /* Save system memory map */
85 v86.addr = 0x15; /* int 0x15 function 0xe820*/
87 v86.ecx = sizeof(struct smap);
89 v86.es = VTOPSEG(&smapbase[smaplen]);
90 v86.edi = VTOPOFF(&smapbase[smaplen]);
93 if ((v86.efl & 1) || (v86.eax != SMAPSIG))
95 } while (v86.ebx != 0 && smaplen < n);
98 bios_addsmapdata(struct preloaded_file *kfp)
102 if (smapbase == 0 || smaplen == 0)
104 len = smaplen * sizeof(*smapbase);
105 file_addmetadata(kfp, MODINFOMD_SMAP, len, smapbase);
106 /* Temporary compatibility with older development kernels */
107 file_addmetadata(kfp, 0x0009, len, smapbase);