support 32 bit UEFI firmware on x86_64/i386 architecture (bsc#1208003…

…, jsc#PED-2569)

src/lib/bootloader/bootloader_factory.rb

@@ -96,7 +96,7 @@ def boot_efi?
       def proposed_name
         return "grub2-efi" if Systeminfo.efi_mandatory?
 
-        return "grub2-efi" if Yast::Arch.x86_64 && boot_efi?
+        return "grub2-efi" if (Yast::Arch.x86_64 || Yast::Arch.i386) && boot_efi?
 
         "grub2" # grub2 works(c) everywhere
       end

src/lib/bootloader/grub2efi.rb

@@ -72,7 +72,7 @@ def name
     def packages
       res = super
 
-      case Yast::Arch.architecture
+      case Systeminfo.efi_arch
       when "i386"
         res << "grub2-i386-efi"
       when "x86_64"

src/lib/bootloader/grub_install.rb

@@ -167,7 +167,7 @@ def target
       return @target if @target
 
       arch = Yast::Arch.architecture
-      target = efi ? EFI_TARGETS[arch] : NON_EFI_TARGETS[arch]
+      target = efi ? EFI_TARGETS[Systeminfo.efi_arch] : NON_EFI_TARGETS[arch]
 
       if !target
         raise "unsupported combination of architecture #{arch} and " \

src/lib/bootloader/systeminfo.rb

@@ -28,6 +28,9 @@ def secure_boot_active?
       #
       # @return [Boolean] true if secure boot is (in principle) supported on this system
       def secure_boot_supported?
+        # no shim for i386 (yet)
+        return false if efi_arch == "i386"
+
         efi_supported? || s390_secure_boot_supported? || ppc_secure_boot_supported?
       end
 
@@ -36,6 +39,9 @@ def secure_boot_supported?
       # @param bootloader_name [String] bootloader name
       # @return [Boolean] true if secure boot setting is available with this bootloader
       def secure_boot_available?(bootloader_name)
+        # no shim for i386 (yet)
+        return false if efi_arch == "i386"
+
         efi_used?(bootloader_name) || s390_secure_boot_available? || ppc_secure_boot_available?
       end
 
@@ -108,6 +114,31 @@ def shim_needed?(bootloader_name, secure_boot)
           secure_boot && efi_used?(bootloader_name)
       end
 
+      # UEFI platform size (32 or 64 bits).
+      #
+      # On x86_64 systems both variants are possible.
+      #
+      # @return [Integer] platform size - or 0 if not applicable
+      def efi_platform_size
+        bits = File.read("/sys/firmware/efi/fw_platform_size").to_i
+        log.info "EFI platform size: #{bits}"
+        bits
+      rescue StandardError
+        0
+      end
+
+      # Effective UEFI architecture.
+      #
+      # Usually the same as the architecture except on x86_64 where it
+      # depends on the platform size.
+      #
+      # @return [String] architecture name
+      def efi_arch
+        arch = Yast::Arch.architecture
+        arch = "i386" if arch == "x86_64" && efi_platform_size == 32
+        arch
+      end
+
       # Check if secure boot is (in principle) available on an s390 machine.
       #
       # @return [Boolean] true if this is an s390 machine and it has secure boot support