86 lines
2 KiB
C
86 lines
2 KiB
C
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2013 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include <grub/util/install.h>
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#include <grub/emu/exec.h>
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#include <sys/types.h>
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#include <dirent.h>
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#include <string.h>
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#include <sys/utsname.h>
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static int
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is_not_empty_directory (const char *dir)
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{
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DIR *d;
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struct dirent *de;
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d = opendir (dir);
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if (!d)
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return 0;
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while ((de = readdir (d)))
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{
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if (strcmp (de->d_name, ".") == 0
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|| strcmp (de->d_name, "..") == 0)
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continue;
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closedir (d);
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return 1;
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}
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closedir (d);
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return 0;
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}
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static int
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is_64_kernel (void)
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{
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struct utsname un;
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if (uname (&un) < 0)
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return 0;
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return strcmp (un.machine, "x86_64") == 0;
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}
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const char *
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grub_install_get_default_x86_platform (void)
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{
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/*
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On Linux, we need the efivars kernel modules.
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If no EFI is available this module just does nothing
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besides a small hello and if we detect efi we'll load it
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anyway later. So it should be safe to
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try to load it here.
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*/
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grub_util_exec ((const char * []){ "modprobe", "-q",
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"efivars", NULL });
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if (is_not_empty_directory ("/sys/firmware/efi"))
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{
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if (is_64_kernel ())
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return "x86_64-efi";
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else
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return "i386-efi";
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}
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else if (is_not_empty_directory ("/proc/device-tree"))
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return "i386-ieee1275";
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else
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return "i386-pc";
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}
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