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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 <swab.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 FWCfgFiles *fw_files;
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);
}
static void fw_cfg_init_file(void)
{
u32 i, size, count = 0;
if (fw_files != NULL)
return;
fw_cfg_get(FW_CFG_FILE_DIR, &count, sizeof(count));
count = swab32(count);
size = count * sizeof(FWCfgFile) + sizeof(count);
printk(BIOS_DEBUG, "QEMU: %d files in fw_cfg\n", count);
fw_files = malloc(size);
fw_cfg_get(FW_CFG_FILE_DIR, fw_files, size);
fw_files->count = swab32(fw_files->count);
for (i = 0; i < count; i++) {
fw_files->f[i].size = swab32(fw_files->f[i].size);
fw_files->f[i].select = swab16(fw_files->f[i].select);
printk(BIOS_DEBUG, "QEMU: %s [size=%d]\n",
fw_files->f[i].name, fw_files->f[i].size);
}
}
static FWCfgFile *fw_cfg_find_file(const char *name)
{
int i;
fw_cfg_init_file();
for (i = 0; i < fw_files->count; i++)
if (strcmp(fw_files->f[i].name, name) == 0)
return fw_files->f + i;
return NULL;
}
int fw_cfg_check_file(const char *name)
{
FWCfgFile *file;
if (!fw_cfg_present())
return -1;
file = fw_cfg_find_file(name);
if (!file)
return -1;
return file->size;
}
void fw_cfg_load_file(const char *name, void *dst)
{
FWCfgFile *file;
if (!fw_cfg_present())
return;
file = fw_cfg_find_file(name);
if (!file)
return;
fw_cfg_get(file->select, dst, file->size);
}
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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