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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: src/sys/boot/i386/libi386/biossmap.c,v 1.9.2.1.6.1 2010/12/21 17:09:25 kensmith Exp $");
/*
* Obtain memory configuration information from the BIOS
*/
#include <stand.h>
#include <sys/param.h>
#include <sys/linker.h>
#include <sys/queue.h>
#include <sys/stddef.h>
#include <machine/metadata.h>
#include <machine/psl.h>
#include <machine/pc/bios.h>
#include "bootstrap.h"
#include "libi386.h"
#include "btxv86.h"
#define V86_CY(x) ((x) & PSL_C)
struct smap_buf {
struct bios_smap smap;
uint32_t xattr; /* Extended attribute from ACPI 3.0 */
STAILQ_ENTRY(smap_buf) bufs;
};
#define SMAP_BUFSIZE offsetof(struct smap_buf, bufs)
static struct bios_smap *smapbase;
static uint32_t *smapattr;
static u_int smaplen;
void
bios_getsmap(void)
{
struct smap_buf buf;
STAILQ_HEAD(smap_head, smap_buf) head =
STAILQ_HEAD_INITIALIZER(head);
struct smap_buf *cur, *next;
u_int n, x;
STAILQ_INIT(&head);
n = 0;
x = 0;
v86.ebx = 0;
do {
v86.ctl = V86_FLAGS;
v86.addr = 0x15;
v86.eax = 0xe820; /* int 0x15 function 0xe820 */
v86.ecx = SMAP_BUFSIZE;
v86.edx = SMAP_SIG;
v86.es = VTOPSEG(&buf);
v86.edi = VTOPOFF(&buf);
v86int();
if (V86_CY(v86.efl) || v86.eax != SMAP_SIG ||
v86.ecx < sizeof(buf.smap) || v86.ecx > SMAP_BUFSIZE)
break;
next = malloc(sizeof(*next));
if (next == NULL)
break;
next->smap = buf.smap;
if (v86.ecx == SMAP_BUFSIZE) {
next->xattr = buf.xattr;
x++;
}
STAILQ_INSERT_TAIL(&head, next, bufs);
n++;
} while (v86.ebx != 0);
smaplen = n;
if (smaplen > 0) {
smapbase = malloc(smaplen * sizeof(*smapbase));
if (smapbase != NULL) {
n = 0;
STAILQ_FOREACH(cur, &head, bufs)
smapbase[n++] = cur->smap;
}
if (smaplen == x) {
smapattr = malloc(smaplen * sizeof(*smapattr));
if (smapattr != NULL) {
n = 0;
STAILQ_FOREACH(cur, &head, bufs)
smapattr[n++] = cur->xattr &
SMAP_XATTR_MASK;
}
} else
smapattr = NULL;
cur = STAILQ_FIRST(&head);
while (cur != NULL) {
next = STAILQ_NEXT(cur, bufs);
free(cur);
cur = next;
}
}
}
void
bios_addsmapdata(struct preloaded_file *kfp)
{
size_t size;
if (smapbase == NULL || smaplen == 0)
return;
size = smaplen * sizeof(*smapbase);
file_addmetadata(kfp, MODINFOMD_SMAP, size, smapbase);
if (smapattr != NULL) {
size = smaplen * sizeof(*smapattr);
file_addmetadata(kfp, MODINFOMD_SMAP_XATTR, size, smapattr);
}
}
COMMAND_SET(smap, "smap", "show BIOS SMAP", command_smap);
static int
command_smap(int argc, char *argv[])
{
u_int i;
if (smapbase == NULL || smaplen == 0)
return (CMD_ERROR);
if (smapattr != NULL)
for (i = 0; i < smaplen; i++)
printf("SMAP type=%02x base=%016llx len=%016llx attr=%02x\n",
(unsigned int)smapbase[i].type,
(unsigned long long)smapbase[i].base,
(unsigned long long)smapbase[i].length,
(unsigned int)smapattr[i]);
else
for (i = 0; i < smaplen; i++)
printf("SMAP type=%02x base=%016llx len=%016llx\n",
(unsigned int)smapbase[i].type,
(unsigned long long)smapbase[i].base,
(unsigned long long)smapbase[i].length);
return (CMD_OK);
}
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