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/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2013 Free Software Foundation, Inc.
*
* GRUB 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, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <grub/util/install.h>
#include <grub/emu/exec.h>
#include <grub/emu/misc.h>
#include <sys/types.h>
#include <dirent.h>
#include <string.h>
#include <sys/utsname.h>
static int
is_not_empty_directory (const char *dir)
{
DIR *d;
struct dirent *de;
d = opendir (dir);
if (!d)
return 0;
while ((de = readdir (d)))
{
if (strcmp (de->d_name, ".") == 0
|| strcmp (de->d_name, "..") == 0)
continue;
closedir (d);
return 1;
}
closedir (d);
return 0;
}
static int
is_64_kernel (void)
{
struct utsname un;
if (uname (&un) < 0)
return 0;
return strcmp (un.machine, "x86_64") == 0;
}
static int
read_platform_size (void)
{
FILE *fp;
char *buf = NULL;
size_t len = 0;
int ret = 0;
/* Newer kernels can tell us directly about the size of the
* underlying firmware - let's see if that interface is there. */
fp = grub_util_fopen ("/sys/firmware/efi/fw_platform_size", "r");
if (fp != NULL)
{
if (getline (&buf, &len, fp) >= 3) /* 2 digits plus newline */
{
if (strncmp (buf, "32", 2) == 0)
ret = 32;
else if (strncmp (buf, "64", 2) == 0)
ret = 64;
}
free (buf);
fclose (fp);
}
if (ret == 0)
{
/* Unrecognised - fall back to matching the kernel size
* instead */
if (is_64_kernel ())
ret = 64;
else
ret = 32;
}
return ret;
}
/* Are we running on an EFI-based system? */
static int
is_efi_system (void)
{
/*
* Linux uses efivarfs (mounted on /sys/firmware/efi/efivars) to access the
* EFI variable store. Some legacy systems may still use the deprecated
* efivars interface (accessed through /sys/firmware/efi/vars). Where both
* are present, libefivar will use the former in preference, so attempting
* to load efivars will not interfere with later operations.
*/
grub_util_exec_redirect_all ((const char * []){ "modprobe", "efivars", NULL },
NULL, NULL, "/dev/null");
grub_util_info ("Looking for /sys/firmware/efi ..");
if (is_not_empty_directory ("/sys/firmware/efi"))
{
grub_util_info ("...found");
return 1;
}
else
{
grub_util_info ("... not found");
return 0;
}
}
const char *
grub_install_get_default_arm_platform (void)
{
if (is_efi_system())
return "arm-efi";
else
return "arm-uboot";
}
const char *
grub_install_get_default_x86_platform (void)
{
if (is_efi_system())
{
if (read_platform_size() == 64)
return "x86_64-efi";
else
return "i386-efi";
}
grub_util_info ("Looking for /proc/device-tree ..");
if (is_not_empty_directory ("/proc/device-tree"))
{
grub_util_info ("...found");
return "i386-ieee1275";
}
grub_util_info ("... not found");
return "i386-pc";
}
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