grub-install: Check for arm-efi as a default target
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>
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4 changed files with 43 additions and 10 deletions
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@ -18,6 +18,12 @@
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#include <grub/util/install.h>
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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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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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@ -97,15 +97,16 @@ read_platform_size (void)
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return ret;
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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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/* 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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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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* 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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@ -114,13 +115,36 @@ grub_install_get_default_x86_platform (void)
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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 ("... not found. Looking for /proc/device-tree ..");
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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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@ -210,6 +210,9 @@ grub_util_get_target_dirname (const struct grub_install_image_target_desc *t);
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void
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grub_install_create_envblk_file (const char *name);
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const char *
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grub_install_get_default_arm_platform (void);
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const char *
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grub_install_get_default_x86_platform (void);
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@ -319,7 +319,7 @@ get_default_platform (void)
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#elif defined (__ia64__)
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return "ia64-efi";
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#elif defined (__arm__)
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return "arm-uboot";
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return grub_install_get_default_arm_platform ();
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#elif defined (__aarch64__)
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return "arm64-efi";
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#elif defined (__amd64__) || defined (__x86_64__) || defined (__i386__)
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