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/*
* This file is part of the coreboot project.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <string.h>
#include <console/console.h>
#include <arch/io.h>
#include "fw_cfg.h"
#include "fw_cfg_if.h"
#define FW_CFG_PORT_CTL 0x0510
#define FW_CFG_PORT_DATA 0x0511
static unsigned char fw_cfg_detected = 0xff;
static int fw_cfg_present(void)
{
static const char qsig[] = "QEMU";
unsigned char sig[4];
if (fw_cfg_detected == 0xff) {
fw_cfg_get(FW_CFG_SIGNATURE, sig, sizeof(sig));
fw_cfg_detected = (memcmp(sig, qsig, 4) == 0) ? 1 : 0;
printk(BIOS_INFO, "QEMU: firmware config interface %s\n",
fw_cfg_detected ? "detected" : "not found");
}
return fw_cfg_detected;
}
void fw_cfg_get(int entry, void *dst, int dstlen)
{
outw(entry, FW_CFG_PORT_CTL);
insb(FW_CFG_PORT_DATA, dst, dstlen);
}
int fw_cfg_max_cpus(void)
{
unsigned short max_cpus;
if (!fw_cfg_present())
return -1;
fw_cfg_get(FW_CFG_MAX_CPUS, &max_cpus, sizeof(max_cpus));
return max_cpus;
}
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