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The EFI capsule mechanism allows data blobs to be passed to the EFI firmware. A common use case is performing firmware updates. This patch just introduces the main infrastructure for interacting with the firmware, and a driver that allows users to upload capsules will come in a later patch. Once a capsule has been passed to the firmware, the next reboot must be performed using the ResetSystem() EFI runtime service, which may involve overriding the reboot type specified by reboot=. This ensures the reset value returned by QueryCapsuleCapabilities() is used to reset the system, which is required for the capsule to be processed. efi_capsule_pending() is provided for this purpose. At the moment we only allow a single capsule blob to be sent to the firmware despite the fact that UpdateCapsule() takes a 'CapsuleCount' parameter. This simplifies the API and shouldn't result in any downside since it is still possible to send multiple capsules by repeatedly calling UpdateCapsule(). Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Bryan O'Donoghue <pure.logic@nexus-software.ie> Cc: Kweh Hock Leong <hock.leong.kweh@intel.com> Cc: Mark Salter <msalter@redhat.com> Cc: Peter Jones <pjones@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: joeyli <jlee@suse.com> Cc: linux-efi@vger.kernel.org Link: http://lkml.kernel.org/r/1461614832-17633-28-git-send-email-matt@codeblueprint.co.uk Signed-off-by: Ingo Molnar <mingo@kernel.org>
27 lines
872 B
Makefile
27 lines
872 B
Makefile
#
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# Makefile for linux kernel
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#
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#
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# ARM64 maps efi runtime services in userspace addresses
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# which don't have KASAN shadow. So dereference of these addresses
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# in efi_call_virt() will cause crash if this code instrumented.
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#
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KASAN_SANITIZE_runtime-wrappers.o := n
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obj-$(CONFIG_EFI) += efi.o vars.o reboot.o memattr.o
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obj-$(CONFIG_EFI) += capsule.o
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obj-$(CONFIG_EFI_VARS) += efivars.o
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obj-$(CONFIG_EFI_ESRT) += esrt.o
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obj-$(CONFIG_EFI_VARS_PSTORE) += efi-pstore.o
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obj-$(CONFIG_UEFI_CPER) += cper.o
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obj-$(CONFIG_EFI_RUNTIME_MAP) += runtime-map.o
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obj-$(CONFIG_EFI_RUNTIME_WRAPPERS) += runtime-wrappers.o
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obj-$(CONFIG_EFI_STUB) += libstub/
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obj-$(CONFIG_EFI_FAKE_MEMMAP) += fake_mem.o
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obj-$(CONFIG_EFI_BOOTLOADER_CONTROL) += efibc.o
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arm-obj-$(CONFIG_EFI) := arm-init.o arm-runtime.o
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obj-$(CONFIG_ARM) += $(arm-obj-y)
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obj-$(CONFIG_ARM64) += $(arm-obj-y)
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