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| author | Alexander Graf <agraf@suse.de> | 2016-03-04 01:10:01 +0100 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2016-03-15 18:03:10 -0400 |
| commit | 50149ea37a21dcbed675297f1536c31a7db39c19 (patch) | |
| tree | d6a18d12c1306cbc1306baed0aeea5ff2f5d2ae4 /arch/arm | |
| parent | c1311ad4e0d1759788601513fac0f65620d40472 (diff) | |
| download | talos-obmc-uboot-50149ea37a21dcbed675297f1536c31a7db39c19.tar.gz talos-obmc-uboot-50149ea37a21dcbed675297f1536c31a7db39c19.zip | |
efi_loader: Add runtime services
After booting has finished, EFI allows firmware to still interact with the OS
using the "runtime services". These callbacks live in a separate address space,
since they are available long after U-Boot has been overwritten by the OS.
This patch adds enough framework for arbitrary code inside of U-Boot to become
a runtime service with the right section attributes set. For now, we don't make
use of it yet though.
We could maybe in the future map U-boot environment variables to EFI variables
here.
Signed-off-by: Alexander Graf <agraf@suse.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/config.mk | 4 | ||||
| -rw-r--r-- | arch/arm/cpu/armv8/u-boot.lds | 16 | ||||
| -rw-r--r-- | arch/arm/cpu/u-boot.lds | 30 | ||||
| -rw-r--r-- | arch/arm/lib/sections.c | 4 |
4 files changed, 54 insertions, 0 deletions
diff --git a/arch/arm/config.mk b/arch/arm/config.mk index 8fa57ecfd8..9af6c37218 100644 --- a/arch/arm/config.mk +++ b/arch/arm/config.mk @@ -122,6 +122,10 @@ ifdef CONFIG_OF_EMBED OBJCOPYFLAGS += -j .dtb.init.rodata endif +ifdef CONFIG_EFI_LOADER +OBJCOPYFLAGS += -j .efi_runtime -j .efi_runtime_rel +endif + ifneq ($(CONFIG_IMX_CONFIG),) ifdef CONFIG_SPL ifndef CONFIG_SPL_BUILD diff --git a/arch/arm/cpu/armv8/u-boot.lds b/arch/arm/cpu/armv8/u-boot.lds index 4c12222370..fd15ad5963 100644 --- a/arch/arm/cpu/armv8/u-boot.lds +++ b/arch/arm/cpu/armv8/u-boot.lds @@ -42,6 +42,22 @@ SECTIONS . = ALIGN(8); + .efi_runtime : { + __efi_runtime_start = .; + *(efi_runtime_text) + *(efi_runtime_data) + __efi_runtime_stop = .; + } + + .efi_runtime_rel : { + __efi_runtime_rel_start = .; + *(.relaefi_runtime_text) + *(.relaefi_runtime_data) + __efi_runtime_rel_stop = .; + } + + . = ALIGN(8); + .image_copy_end : { *(.__image_copy_end) diff --git a/arch/arm/cpu/u-boot.lds b/arch/arm/cpu/u-boot.lds index e148ab7513..13aa4fa488 100644 --- a/arch/arm/cpu/u-boot.lds +++ b/arch/arm/cpu/u-boot.lds @@ -90,6 +90,36 @@ SECTIONS . = 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); + .image_copy_end : { *(.__image_copy_end) diff --git a/arch/arm/lib/sections.c b/arch/arm/lib/sections.c index a1205c370d..6a94522418 100644 --- a/arch/arm/lib/sections.c +++ b/arch/arm/lib/sections.c @@ -27,4 +27,8 @@ char __rel_dyn_start[0] __attribute__((section(".__rel_dyn_start"))); char __rel_dyn_end[0] __attribute__((section(".__rel_dyn_end"))); char __secure_start[0] __attribute__((section(".__secure_start"))); char __secure_end[0] __attribute__((section(".__secure_end"))); +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"))); char _end[0] __attribute__((section(".__end"))); |
