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/*-
* Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* Obtain memory configuration information from the BIOS
*/
#include <stand.h>
#include <sys/param.h>
#include <sys/linker.h>
#include <machine/metadata.h>
#include "bootstrap.h"
#include "libi386.h"
#include "btxv86.h"
#define SMAPSIG 0x534D4150
struct smap {
u_int64_t base;
u_int64_t length;
u_int32_t type;
} __packed;
static struct smap smap;
static struct smap *smapbase;
static int smaplen;
void
bios_getsmap(void)
{
int n;
n = 0;
smaplen = 0;
/* Count up segments in system memory map */
v86.ebx = 0;
do {
v86.ctl = V86_FLAGS;
v86.addr = 0x15; /* int 0x15 function 0xe820*/
v86.eax = 0xe820;
v86.ecx = sizeof(struct smap);
v86.edx = SMAPSIG;
v86.es = VTOPSEG(&smap);
v86.edi = VTOPOFF(&smap);
v86int();
if ((v86.efl & 1) || (v86.eax != SMAPSIG))
break;
n++;
} while (v86.ebx != 0);
if (n == 0)
return;
n += 10; /* spare room */
smapbase = malloc(n * sizeof(*smapbase));
/* Save system memory map */
v86.ebx = 0;
do {
v86.ctl = V86_FLAGS;
v86.addr = 0x15; /* int 0x15 function 0xe820*/
v86.eax = 0xe820;
v86.ecx = sizeof(struct smap);
v86.edx = SMAPSIG;
v86.es = VTOPSEG(&smap);
v86.edi = VTOPOFF(&smap);
v86int();
bcopy(&smap, &smapbase[smaplen], sizeof(struct smap));
smaplen++;
if ((v86.efl & 1) || (v86.eax != SMAPSIG))
break;
} while (v86.ebx != 0 && smaplen < n);
}
void
bios_addsmapdata(struct preloaded_file *kfp)
{
int len;
if (smapbase == 0 || smaplen == 0)
return;
len = smaplen * sizeof(*smapbase);
file_addmetadata(kfp, MODINFOMD_SMAP, len, smapbase);
}
COMMAND_SET(smap, "smap", "show BIOS SMAP", command_smap);
static int
command_smap(int argc, char *argv[])
{
int i;
if (smapbase == 0 || smaplen == 0)
return (CMD_ERROR);
for (i = 0; i < smaplen; i++)
printf("SMAP type=%02x base=%016llx len=%016llx\n",
smapbase[i].type, smapbase[i].base, smapbase[i].length);
return (CMD_OK);
}
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