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 <s...@chromium.org>
---
arch/x86/cpu/u-boot.lds | 36 +++++++++++++++++++++++++++++++++++-
arch/x86/lib/Makefile | 1 +
arch/x86/lib/sections.c | 12 ++++++++++++
include/efi.h | 3 ++-
lib/efi_loader/efi_boottime.c | 9 +++++++++
lib/efi_loader/efi_runtime.c | 4 ++++
6 files changed, 63 insertions(+), 2 deletions(-)
create mode 100644 arch/x86/lib/sections.c
diff --git a/arch/x86/cpu/u-boot.lds b/arch/x86/cpu/u-boot.lds
index 36f59ea..cca536b 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 e17f0bb..e46e7f1 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-$(CONFIG_X86_RAMTEST) += ramtest.o
+obj-y += sections.o
obj-y += sfi.o
obj-$(CONFIG_GENERATE_SMBIOS_TABLE) += smbios.o
obj-y += string.o
diff --git a/arch/x86/lib/sections.c b/arch/x86/lib/sections.c
new file mode 100644
index 0000000..6455e0f
--- /dev/null
+++ b/arch/x86/lib/sections.c
@@ -0,0 +1,12 @@
+/*
+ * Copyright 2013 Albert ARIBAUD <albert.u.b...@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")));
diff --git a/include/efi.h b/include/efi.h
index 1dbc3b7..47b351f 100644
--- a/include/efi.h
+++ b/include/efi.h
@@ -15,6 +15,7 @@
#ifndef _EFI_H
#define _EFI_H
+#include <linux/linkage.h>
#include <linux/string.h>
#include <linux/types.h>
@@ -22,7 +23,7 @@
/* EFI uses the Microsoft ABI which is not the default for GCC */
#define EFIAPI __attribute__((ms_abi))
#else
-#define EFIAPI
+#define EFIAPI asmlinkage
#endif
struct efi_device_path;
diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c
index 798b566..e027bd3 100644
--- a/lib/efi_loader/efi_boottime.c
+++ b/lib/efi_loader/efi_boottime.c
@@ -39,6 +39,7 @@ static bool efi_is_direct_boot = true;
*/
static struct efi_configuration_table EFI_RUNTIME_DATA efi_conf_table[1];
+#ifdef CONFIG_ARM
/*
* The "gd" pointer lives in a register on ARM and AArch64 that we declare
* fixed when compiling U-Boot. However, the payload does not know about that
@@ -46,16 +47,20 @@ static struct efi_configuration_table EFI_RUNTIME_DATA
efi_conf_table[1];
* EFI callback entry/exit.
*/
static volatile void *efi_gd, *app_gd;
+#endif
/* Called from do_bootefi_exec() */
void efi_save_gd(void)
{
+#ifdef CONFIG_ARM
efi_gd = gd;
+#endif
}
/* Called on every callback entry */
void efi_restore_gd(void)
{
+#ifdef CONFIG_ARM
/* Only restore if we're already in EFI context */
if (!efi_gd)
return;
@@ -63,12 +68,16 @@ void efi_restore_gd(void)
if (gd != efi_gd)
app_gd = gd;
gd = efi_gd;
+#endif
}
/* Called on every callback exit */
efi_status_t efi_exit_func(efi_status_t ret)
{
+#ifdef CONFIG_ARM
gd = app_gd;
+#endif
+
return ret;
}
diff --git a/lib/efi_loader/efi_runtime.c b/lib/efi_loader/efi_runtime.c
index 99b5ef1..3793471 100644
--- a/lib/efi_loader/efi_runtime.c
+++ b/lib/efi_loader/efi_runtime.c
@@ -34,6 +34,10 @@ static efi_status_t EFI_RUNTIME_TEXT EFIAPI
efi_invalid_parameter(void);
#elif defined(CONFIG_ARM)
#define R_RELATIVE 23
#define R_MASK 0xffULL
+#elif defined(CONFIG_X86)
+#include <asm/elf.h>
+#define R_RELATIVE R_386_RELATIVE
+#define R_MASK 0xffULL
#else
#error Need to add relocation awareness
#endif
--
2.8.0.rc3.226.g39d4020
_______________________________________________
U-Boot mailing list
U-Boot@lists.denx.de
http://lists.denx.de/mailman/listinfo/u-boot
