c28c107e24
Much like on x86, we can work out if the system is running on top of EFI firmware. If so, return "arm-efi". If not, fall back to "arm-uboot" as previously. Split out the code to (maybe) load the efivar module and check for /sys/firmware/efi into a common helper routine is_efi_system(). Signed-off-by: Steve McIntyre <93sam@debian.org> Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
156 lines
3.4 KiB
C
156 lines
3.4 KiB
C
/*
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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 <grub/emu/misc.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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static int
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read_platform_size (void)
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{
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FILE *fp;
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char *buf = NULL;
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size_t len = 0;
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int ret = 0;
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/* Newer kernels can tell us directly about the size of the
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* underlying firmware - let's see if that interface is there. */
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fp = grub_util_fopen ("/sys/firmware/efi/fw_platform_size", "r");
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if (fp != NULL)
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{
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if (getline (&buf, &len, fp) >= 3) /* 2 digits plus newline */
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{
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if (strncmp (buf, "32", 2) == 0)
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ret = 32;
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else if (strncmp (buf, "64", 2) == 0)
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ret = 64;
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}
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free (buf);
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fclose (fp);
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}
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if (ret == 0)
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{
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/* Unrecognised - fall back to matching the kernel size
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* instead */
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if (is_64_kernel ())
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ret = 64;
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else
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ret = 32;
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}
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return ret;
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}
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/* Are we running on an EFI-based system? */
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static int
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is_efi_system (void)
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{
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/*
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* Linux uses efivarfs (mounted on /sys/firmware/efi/efivars) to access the
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* EFI variable store. Some legacy systems may still use the deprecated
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* efivars interface (accessed through /sys/firmware/efi/vars). Where both
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* are present, libefivar will use the former in preference, so attempting
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* to load efivars will not interfere with later operations.
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*/
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grub_util_exec_redirect_all ((const char * []){ "modprobe", "efivars", NULL },
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NULL, NULL, "/dev/null");
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grub_util_info ("Looking for /sys/firmware/efi ..");
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if (is_not_empty_directory ("/sys/firmware/efi"))
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{
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grub_util_info ("...found");
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return 1;
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}
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else
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{
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grub_util_info ("... not found");
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return 0;
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}
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}
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const char *
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grub_install_get_default_arm_platform (void)
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{
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if (is_efi_system())
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return "arm-efi";
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else
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return "arm-uboot";
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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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if (is_efi_system())
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{
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if (read_platform_size() == 64)
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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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grub_util_info ("Looking for /proc/device-tree ..");
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if (is_not_empty_directory ("/proc/device-tree"))
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{
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grub_util_info ("...found");
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return "i386-ieee1275";
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}
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grub_util_info ("... not found");
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return "i386-pc";
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}
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