cpu/x86: remove BACKUP_DEFAULT_SMM_REGION option

Unconditionally provide the backup default SMM area API. There's no
reason to guard the symbols behind anything since linker garbage
collection is implemented. A board or chipset is free to use the
code or not without needing to select an option.

Change-Id: I14cf1318136a17f48ba5ae119507918190e25387
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/14561
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

src/cpu/intel/haswell/Kconfig

@@ -10,7 +10,6 @@ config CPU_SPECIFIC_OPTIONS
 	select ARCH_VERSTAGE_X86_32
 	select ARCH_ROMSTAGE_X86_32
 	select ARCH_RAMSTAGE_X86_32
-	select BACKUP_DEFAULT_SMM_REGION
 	select HAVE_MONOTONIC_TIMER
 	select SMP
 	select MMX

src/cpu/x86/Kconfig

@@ -127,12 +127,6 @@ config PLATFORM_USES_FSP1_0
 	  Selected for Intel processors/platform combinations that use the
 	  Intel Firmware Support Package (FSP) 1.0 for initialization.
 
-config BACKUP_DEFAULT_SMM_REGION
-	def_bool n
-	help
-	 The CPU support will select this option if the default SMM region
-	 needs to be backed up for suspend/resume purposes.
-
 config MIRROR_PAYLOAD_TO_RAM_BEFORE_LOADING
 	def_bool n
 	help

src/cpu/x86/Makefile.inc

@@ -5,6 +5,7 @@ endif
 subdirs-$(CONFIG_PARALLEL_MP) += name
 ramstage-$(CONFIG_PARALLEL_MP) += mp_init.c
 ramstage-$(CONFIG_MIRROR_PAYLOAD_TO_RAM_BEFORE_LOADING) += mirror_payload.c
+ramstage-y += backup_default_smm.c
 
 additional-dirs += $(obj)/cpu/x86
 

src/cpu/x86/smm/Makefile.inc

@@ -13,7 +13,6 @@
 ## GNU General Public License for more details.
 ##
 
-ramstage-$(CONFIG_BACKUP_DEFAULT_SMM_REGION) += backup_default_smm.c
 ramstage-y += smm_module_loader.c
 
 ifeq ($(CONFIG_ARCH_RAMSTAGE_X86_32),y)

src/soc/intel/baytrail/Kconfig

@@ -11,7 +11,6 @@ config CPU_SPECIFIC_OPTIONS
 	select ARCH_VERSTAGE_X86_32
 	select ARCH_ROMSTAGE_X86_32
 	select ARCH_RAMSTAGE_X86_32
-	select BACKUP_DEFAULT_SMM_REGION
 	select CACHE_MRC_SETTINGS
 	select CPU_INTEL_TURBO_NOT_PACKAGE_SCOPED
 	select SUPPORT_CPU_UCODE_IN_CBFS

src/soc/intel/braswell/Kconfig

@@ -11,7 +11,6 @@ config CPU_SPECIFIC_OPTIONS
 	select ARCH_RAMSTAGE_X86_32
 	select ARCH_ROMSTAGE_X86_32
 	select ARCH_VERSTAGE_X86_32
-	select BACKUP_DEFAULT_SMM_REGION
 	select CACHE_MRC_SETTINGS
 	select CACHE_RELOCATED_RAMSTAGE_OUTSIDE_CBMEM if RELOCATABLE_RAMSTAGE
 	select COLLECT_TIMESTAMPS

src/soc/intel/broadwell/Kconfig

@@ -11,7 +11,6 @@ config CPU_SPECIFIC_OPTIONS
 	select ARCH_VERSTAGE_X86_32
 	select ARCH_ROMSTAGE_X86_32
 	select ARCH_RAMSTAGE_X86_32
-	select BACKUP_DEFAULT_SMM_REGION
 	select CACHE_MRC_SETTINGS
 	select MRC_SETTINGS_PROTECT
 	select CACHE_RELOCATED_RAMSTAGE_OUTSIDE_CBMEM if RELOCATABLE_RAMSTAGE

src/soc/intel/skylake/Kconfig

@@ -12,7 +12,6 @@ config CPU_SPECIFIC_OPTIONS
 	select ARCH_ROMSTAGE_X86_32
 	select ARCH_VERSTAGE_X86_32
 	select ACPI_NHLT
-	select BACKUP_DEFAULT_SMM_REGION
 	select CACHE_MRC_SETTINGS
 	select CACHE_RELOCATED_RAMSTAGE_OUTSIDE_CBMEM if RELOCATABLE_RAMSTAGE
 	select COLLECT_TIMESTAMPS