src/cpu/x86/Kconfig

if ARCH_X86

config PARALLEL_MP
	def_bool y
	depends on !LEGACY_SMP_INIT
	select CPU_INFO_V2
	help
	 This option uses common MP infrastructure for bringing up APs
	 in parallel. It additionally provides a more flexible mechanism
	 for sequencing the steps of bringing up the APs.
	 The code also works for just initialising the BSP in case there
	 are no APs.

config PARALLEL_MP_AP_WORK
	def_bool n
	depends on PARALLEL_MP
	help
	 Allow APs to do other work after initialization instead of going
	 to sleep.

config X86_SMM_SKIP_RELOCATION_HANDLER
	bool
	default n
	depends on PARALLEL_MP && HAVE_SMI_HANDLER
	help
	  Skip SMM relocation using a relocation handler running in SMM
	  with a stub at 0x30000. This is useful on platforms that have
	  an alternative way to set SMBASE.

config LEGACY_SMP_INIT
	bool

config DEFAULT_X2APIC
	def_bool n
	help
	  Allow SoC code to set LAPIC_ACCESS_MODE to X2APIC.

config DEFAULT_X2APIC_RUNTIME
	def_bool n
	help
	  Allow SoC code to set LAPIC_ACCESS_MODE to X2APIC_RUNTIME.

config DEFAULT_X2APIC_LATE_WORKAROUND
	def_bool n
	help
	  Allow SoC code to set LAPIC_ACCESS_MODE to X2APIC_LATE_WORKAROUND.

choice LAPIC_ACCESS_MODE
	prompt "APIC operation mode"
	default X2APIC_ONLY if DEFAULT_X2APIC
	default X2APIC_RUNTIME if DEFAULT_X2APIC_RUNTIME
	default X2APIC_LATE_WORKAROUND if DEFAULT_X2APIC_LATE_WORKAROUND
	default XAPIC_ONLY

config XAPIC_ONLY
	prompt "Set XAPIC mode"
	bool

config X2APIC_ONLY
	prompt "Set X2APIC mode"
	bool
	depends on PARALLEL_MP

config X2APIC_RUNTIME
	prompt "Support both XAPIC and X2APIC"
	bool
	depends on PARALLEL_MP

config X2APIC_LATE_WORKAROUND
	prompt "Use XAPIC for AP bringup, then change to X2APIC"
	bool
	depends on PARALLEL_MP && MAX_CPUS < 256
	help
	  Choose this option if the platform supports dynamic switching between
	  XAPIC to X2APIC. The initial Application Processors (APs) are configured
	  in XAPIC mode at reset and later enable X2APIC as a CPU feature.
	  All access mechanisms between XAPIC (mmio) and X2APIC (msr) switches
	  at runtime when this option is enabled.

endchoice

config UDELAY_LAPIC
	bool
	default n

config LAPIC_MONOTONIC_TIMER
	def_bool n
	depends on UDELAY_LAPIC
	help
	  Expose monotonic time using the local APIC.

config UDELAY_LAPIC_FIXED_FSB
	int

config UDELAY_TSC
	bool
	default n

config UNKNOWN_TSC_RATE
	bool
	default y if LAPIC_MONOTONIC_TIMER

config TSC_MONOTONIC_TIMER
	def_bool n
	depends on UDELAY_TSC
	help
	  Expose monotonic time using the TSC.

config TSC_SYNC_LFENCE
	bool
	default n
	help
	  The CPU driver should select this if the CPU needs
	  to execute an lfence instruction in order to synchronize
	  rdtsc. This is true for all modern AMD CPUs.

config TSC_SYNC_MFENCE
	bool
	default n
	help
	  The CPU driver should select this if the CPU needs
	  to execute an mfence instruction in order to synchronize
	  rdtsc. This is true for all modern Intel CPUs.

config SETUP_XIP_CACHE
	bool
	depends on !NO_XIP_EARLY_STAGES
	help
	  Select this option to set up an MTRR to cache XIP stages loaded
	  from the bootblock. This is useful on platforms lacking a
	  non-eviction mode and therefore need to be careful to avoid
	  eviction.

config LOGICAL_CPUS
	bool
	default y

config HAVE_SMI_HANDLER
	bool
	default n
	depends on (SMM_ASEG || SMM_TSEG)

config NO_SMM
	bool
	default n

config SMM_ASEG
	bool
	default n
	depends on !NO_SMM

config SMM_TSEG
	bool
	default y
	depends on !(NO_SMM || SMM_ASEG)

config SMM_LEGACY_ASEG
	bool
	default y if HAVE_SMI_HANDLER && SMM_ASEG && LEGACY_SMP_INIT
	help
	  SMM support without PARALLEL_MP, to be deprecated.

if HAVE_SMI_HANDLER && !SMM_LEGACY_ASEG

config SMM_MODULE_STACK_SIZE
	hex
	default 0x800 if ARCH_RAMSTAGE_X86_64
	default 0x400
	help
	  This option determines the size of the stack within the SMM handler
	  modules.

config SMM_STUB_STACK_SIZE
	hex
	default 0x400
	help
	  This option determines the size of the stack within the SMM handler
	  modules.

endif

config SMM_LAPIC_REMAP_MITIGATION
	bool
	default y if NORTHBRIDGE_INTEL_I945 || NORTHBRIDGE_INTEL_GM45 \
		|| NORTHBRIDGE_INTEL_X4X || NORTHBRIDGE_INTEL_PINEVIEW \
		|| NORTHBRIDGE_INTEL_E7505 || NORTHBRIDGE_INTEL_IRONLAKE
	default n

config X86_AMD_FIXED_MTRRS
	bool
	default n
	help
	  This option informs the MTRR code to use the RdMem and WrMem fields
	  in the fixed MTRR MSRs.

config X86_INIT_NEED_1_SIPI
	bool
	default n
	help
	  This option limits the number of SIPI signals sent during during the
	  common AP setup.  Intel documentation specifies an INIT SIPI SIPI
	  sequence, however this doesn't work on some AMD and Intel platforms.
	  These newer AMD and Intel platforms don't need the 10ms wait between
	  INIT and SIPI, so skip that too to save some time.

config SOC_SETS_MSRS
	bool
	default n
	help
	  The SoC requires different access methods for reading and writing
	  the MSRs.  Use SoC specific routines to handle the MSR access.

config RESERVE_MTRRS_FOR_OS
	bool
	default n
	help
	  This option allows a platform to reserve 2 MTRRs for the OS usage.
	  The Intel SDM documents that the the first 6 MTRRs are intended for
	  the system BIOS and the last 2 are to be reserved for OS usage.
	  However, modern OSes use PAT to control cacheability instead of
	  using MTRRs.

config CPU_INFO_V2
	bool
	depends on PARALLEL_MP
	help
	  Enables the new method of locating struct cpu_info. This new method
	  uses the %gs segment to locate the cpu_info pointer. The old method
	  relied on the stack being CONFIG_STACK_SIZE aligned.

endif # ARCH_X86