Commit 1c5fecb6 authored by Narendra K's avatar Narendra K Committed by Ard Biesheuvel
Browse files

efi: Export Runtime Configuration Interface table to sysfs 



System firmware advertises the address of the 'Runtime
Configuration Interface table version 2 (RCI2)' via
an EFI Configuration Table entry. This code retrieves the RCI2
table from the address and exports it to sysfs as a binary
attribute 'rci2' under /sys/firmware/efi/tables directory.
The approach adopted is similar to the attribute 'DMI' under
/sys/firmware/dmi/tables.

RCI2 table contains BIOS HII in XML format and is used to populate
BIOS setup page in Dell EMC OpenManage Server Administrator tool.
The BIOS setup page contains BIOS tokens which can be configured.

Signed-off-by: default avatarNarendra K <Narendra.K@dell.com>
Reviewed-by: default avatarMario Limonciello <mario.limonciello@dell.com>
Signed-off-by: default avatarArd Biesheuvel <ard.biesheuvel@linaro.org>
parent 5828efb9

Documentation/ABI/testing/sysfs-firmware-efi

+8 −0
Original line number Diff line number Diff line
@@ -28,3 +28,11 @@ Description: Displays the physical addresses of all EFI Configuration 
		versions are always printed first, i.e. ACPI20 comes

		before ACPI.

Users:		dmidecode



What:		/sys/firmware/efi/tables/rci2

Date:		July 2019

Contact:	Narendra K <Narendra.K@dell.com>, linux-bugs@dell.com

Description:	Displays the content of the Runtime Configuration Interface

		Table version 2 on Dell EMC PowerEdge systems in binary format

Users:		It is used by Dell EMC OpenManage Server Administrator tool to

		populate BIOS setup page.

arch/x86/platform/efi/efi.c

+3 −0
Original line number Diff line number Diff line
@@ -82,6 +82,9 @@ static const unsigned long * const efi_tables[] = { 
	&efi.esrt,

	&efi.properties_table,

	&efi.mem_attr_table,

#ifdef CONFIG_EFI_RCI2_TABLE

	&rci2_table_phys,

#endif

};



u64 efi_setup;		/* efi setup_data physical address */

drivers/firmware/efi/Kconfig

+13 −0
Original line number Diff line number Diff line
@@ -180,6 +180,19 @@ config RESET_ATTACK_MITIGATION 
	  have been evicted, since otherwise it will trigger even on clean

	  reboots.



config EFI_RCI2_TABLE

	bool "EFI Runtime Configuration Interface Table Version 2 Support"

	help

	  Displays the content of the Runtime Configuration Interface

	  Table version 2 on Dell EMC PowerEdge systems as a binary

	  attribute 'rci2' under /sys/firmware/efi/tables directory.



	  RCI2 table contains BIOS HII in XML format and is used to populate

	  BIOS setup page in Dell EMC OpenManage Server Administrator tool.

	  The BIOS setup page contains BIOS tokens which can be configured.



	  Say Y here for Dell EMC PowerEdge systems.



endmenu



config UEFI_CPER

drivers/firmware/efi/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -25,6 +25,7 @@ obj-$(CONFIG_EFI_BOOTLOADER_CONTROL) += efibc.o 
obj-$(CONFIG_EFI_TEST)			+= test/

obj-$(CONFIG_EFI_DEV_PATH_PARSER)	+= dev-path-parser.o

obj-$(CONFIG_APPLE_PROPERTIES)		+= apple-properties.o

obj-$(CONFIG_EFI_RCI2_TABLE)		+= rci2-table.o



arm-obj-$(CONFIG_EFI)			:= arm-init.o arm-runtime.o

obj-$(CONFIG_ARM)			+= $(arm-obj-y)

drivers/firmware/efi/efi.c

+3 −0
Original line number Diff line number Diff line
@@ -465,6 +465,9 @@ static __initdata efi_config_table_type_t common_tables[] = { 
	{LINUX_EFI_TPM_EVENT_LOG_GUID, "TPMEventLog", &efi.tpm_log},

	{LINUX_EFI_TPM_FINAL_LOG_GUID, "TPMFinalLog", &efi.tpm_final_log},

	{LINUX_EFI_MEMRESERVE_TABLE_GUID, "MEMRESERVE", &efi.mem_reserve},

#ifdef CONFIG_EFI_RCI2_TABLE

	{DELLEMC_EFI_RCI2_TABLE_GUID, NULL, &rci2_table_phys},

#endif

	{NULL_GUID, NULL, NULL},

};

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