## SPDX-License-Identifier: GPL-2.0-only if ARCH_X86 config PARALLEL_MP def_bool y 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 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 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 help coreboot and SMM runtime only use XAPIC mode. FIXME: DMAR should have X2APIC optout bit set. config X2APIC_ONLY prompt "Set X2APIC mode" bool depends on PARALLEL_MP help coreboot and SMM runtime only use X2APIC mode. Note: OS switches back to XAPIC mode if VT-d is disabled. FIXME: S3 resume (and SMM runtime) will break if OS makes the switch. config X2APIC_RUNTIME prompt "Support both XAPIC and X2APIC" bool depends on PARALLEL_MP help The switch to X2APIC mode happens early in ramstage. SMM runtime can support either mode in case the OS switches back to XAPIC. 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 X86_CLFLUSH_CAR bool help Select this on platforms that allow CLFLUSH while operating in CAR. config HAVE_SMI_HANDLER bool default n depends on (SMM_ASEG || SMM_TSEG) config NO_SMM bool default n config NEED_SMALL_2MB_PAGE_TABLES bool default n help Select this option from boards/SoCs that do not support the Page1GB CPUID feature (CPUID.80000001H:EDX.bit26). config SMM_ASEG bool default n depends on !NO_SMM help Legacy memory region of SMM (System Management Mode). It has been replaced by TSEG and is currently only used for QEMU emulation target. config SMM_TSEG bool default y depends on !(NO_SMM || SMM_ASEG) help Top of Low Memory Segment (TSEG) is comprised of the SMRAM and IEDRAM. SMRAM is a memory region used in SMM (System Management Mode) only. IEDRAM is a memory region used for enhanced debug features. SMM-mode processor access to TSEG always targets the physical DRAM. if HAVE_SMI_HANDLER 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. 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 SMM_PCI_RESOURCE_STORE bool default n help This option enables support for storing PCI resources in SMRAM so SMM can tell if they've been altered. config SMM_PCI_RESOURCE_STORE_NUM_SLOTS int default 8 help Number of slots available to store PCI BARs in SMRAM 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 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 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 AP_STACK_SIZE hex default 0x800 help This is the amount of stack each AP needs. The BSP stack size can be larger and is set with STACK_SIZE. config RUNTIME_CONFIGURABLE_SMM_LOGLEVEL bool default n depends on DEBUG_SMI && CONSOLE_OVERRIDE_LOGLEVEL help This enables setting the SMM console log level at runtime for more flexibility to use different log levels for each stage. Another reason is that reading the log level from non-volatile memory such as flash VPD or CMOS is not very ideal to be done in SMM, with this option the value can be passed via the member variable in struct smm_runtime and be referenced directly in SMM. endif # ARCH_X86