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 <machine/pc/bios.h>
37 #include <machine/psl.h>
38 #include "bootstrap.h"
42 #define SMAPSIG 0x534D4150
50 static struct smap smap;
52 static struct smap *smapbase;
62 /* Count up segments in system memory map */
66 v86.addr = 0x15; /* int 0x15 function 0xe820*/
68 v86.ecx = sizeof(struct smap);
70 v86.es = VTOPSEG(&smap);
71 v86.edi = VTOPOFF(&smap);
73 if ((v86.efl & PSL_C) || (v86.eax != SMAPSIG))
76 } while (v86.ebx != 0);
79 n += 10; /* spare room */
80 smapbase = malloc(n * sizeof(*smapbase));
82 /* Save system memory map */
86 v86.addr = 0x15; /* int 0x15 function 0xe820*/
88 v86.ecx = sizeof(struct smap);
90 v86.es = VTOPSEG(&smap);
91 v86.edi = VTOPOFF(&smap);
95 * Our heap is now in high memory and must be removed from
96 * the smap so the kernel does not blow away passed-in
97 * arguments, smap, kenv, etc.
99 * This wastes a little memory.
101 if (smap.type == SMAP_TYPE_MEMORY &&
102 smap.base + smap.length > heapbase &&
103 smap.base < memtop) {
104 if (smap.base <= heapbase) {
105 if (heapbase - smap.base) {
106 smapbase[smaplen] = smap;
107 smapbase[smaplen].length =
108 heapbase - smap.base;
112 if (smap.base + smap.length >= memtop) {
113 if (smap.base + smap.length - memtop) {
114 smapbase[smaplen] = smap;
115 smapbase[smaplen].base = memtop;
116 smapbase[smaplen].length =
117 smap.base + smap.length -
123 smapbase[smaplen] = smap;
126 if ((v86.efl & PSL_C) || (v86.eax != SMAPSIG))
128 } while (v86.ebx != 0 && smaplen < n);
131 bios_addsmapdata(struct preloaded_file *kfp)
135 if (smapbase == NULL || smaplen == 0)
137 len = smaplen * sizeof(*smapbase);
138 file_addmetadata(kfp, MODINFOMD_SMAP, len, smapbase);
139 /* Temporary compatibility with older development kernels */
140 file_addmetadata(kfp, 0x0009, len, smapbase);