x86: efi: Add EFI loader support for x86

Add the required pieces to support the EFI loader on x86.

Since U-Boot only builds for 32-bit on x86, only a 32-bit EFI application
is supported. If a 64-bit kernel must be booted, U-Boot supports this
directly using FIT (see doc/uImage.FIT/kernel.its). U-Boot can act as a
payload for both 32-bit and 64-bit EFI.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Signed-off-by: Alexander Graf <agraf@suse.de>

3 files changed, 48 insertions, 1 deletions

diff --git a/arch/x86/cpu/u-boot.lds b/arch/x86/cpu/u-boot.lds
index 36f59ea96db..cca536b2723 100644
--- a/arch/x86/cpu/u-boot.lds
+++ b/arch/x86/cpu/u-boot.lds
@@ -28,7 +28,10 @@ SECTIONS
 	}
 
 	. = ALIGN(4);
-	.rodata : { *(SORT_BY_ALIGNMENT(SORT_BY_NAME(.rodata*))) }
+	.rodata : {
+		*(SORT_BY_ALIGNMENT(SORT_BY_NAME(.rodata*)))
+		KEEP(*(.rodata.efi.init));
+	}
 
 	. = ALIGN(4);
 	.data : { *(.data*) }
@@ -40,6 +43,37 @@ SECTIONS
 	.got : { *(.got*) }
 
 	. = ALIGN(4);
+
+	.__efi_runtime_start : {
+		*(.__efi_runtime_start)
+	}
+
+	.efi_runtime : {
+		*(efi_runtime_text)
+		*(efi_runtime_data)
+	}
+
+	.__efi_runtime_stop : {
+		*(.__efi_runtime_stop)
+	}
+
+	.efi_runtime_rel_start :
+	{
+		*(.__efi_runtime_rel_start)
+	}
+
+	.efi_runtime_rel : {
+		*(.relefi_runtime_text)
+		*(.relefi_runtime_data)
+	}
+
+	.efi_runtime_rel_stop :
+	{
+		*(.__efi_runtime_rel_stop)
+	}
+
+	. = ALIGN(4);
+
 	__data_end = .;
 	__init_end = .;
 
diff --git a/arch/x86/lib/Makefile b/arch/x86/lib/Makefile
index 40ea6bffb74..b9c29226bdb 100644
--- a/arch/x86/lib/Makefile
+++ b/arch/x86/lib/Makefile
@@ -28,6 +28,7 @@ obj-y	+= pirq_routing.o
 obj-y	+= relocate.o
 obj-y += physmem.o
 obj-$(CONFIG_X86_RAMTEST) += ramtest.o
+obj-y	+= sections.o
 obj-y += sfi.o
 obj-y	+= string.o
 ifndef CONFIG_QEMU
diff --git a/arch/x86/lib/sections.c b/arch/x86/lib/sections.c
new file mode 100644
index 00000000000..6455e0f0881
--- /dev/null
+++ b/arch/x86/lib/sections.c
@@ -0,0 +1,12 @@
+/*
+ * Copyright 2013 Albert ARIBAUD <albert.u.boot@aribaud.net>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+char __efi_runtime_start[0] __attribute__((section(".__efi_runtime_start")));
+char __efi_runtime_stop[0] __attribute__((section(".__efi_runtime_stop")));
+char __efi_runtime_rel_start[0]
+		__attribute__((section(".__efi_runtime_rel_start")));
+char __efi_runtime_rel_stop[0]
+		__attribute__((section(".__efi_runtime_rel_stop")));