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 ---
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.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"))); 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