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
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
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 <machine/pc/bios.h>
38 #include "bootstrap.h"
43 struct bios_smap _smap_entry;
44 char pad[8]; /* Bad BIOS writer, no cookie! */
47 static struct bios_smap *smapbase;
57 /* Count up segments in system memory map */
61 v86.addr = 0x15; /* int 0x15 function 0xe820*/
63 v86.ecx = sizeof(struct bios_smap);
65 v86.es = VTOPSEG(&smap);
66 v86.edi = VTOPOFF(&smap);
68 if ((v86.efl & 1) || (v86.eax != SMAP_SIG))
71 } while (v86.ebx != 0);
74 n += 10; /* spare room */
75 smapbase = malloc(n * sizeof(*smapbase));
77 /* Save system memory map */
81 v86.addr = 0x15; /* int 0x15 function 0xe820*/
83 v86.ecx = sizeof(struct bios_smap);
85 v86.es = VTOPSEG(&smap);
86 v86.edi = VTOPOFF(&smap);
88 bcopy(&smap, &smapbase[smaplen], sizeof(struct bios_smap));
90 if ((v86.efl & 1) || (v86.eax != SMAP_SIG))
92 } while (v86.ebx != 0 && smaplen < n);
96 bios_addsmapdata(struct preloaded_file *kfp)
100 if (smapbase == 0 || smaplen == 0)
102 len = smaplen * sizeof(*smapbase);
103 file_addmetadata(kfp, MODINFOMD_SMAP, len, smapbase);
106 COMMAND_SET(smap, "smap", "show BIOS SMAP", command_smap);
109 command_smap(int argc, char *argv[])
113 if (smapbase == 0 || smaplen == 0)
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);