config PARALLEL_MP def_bool y depends on !LEGACY_SMP_INIT depends on SMP 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. 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 LEGACY_SMP_INIT bool choice LAPIC_ACCESS_MODE prompt "APIC operation mode" 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 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) if SMM_TSEG config SMM_MODULE_HEAP_SIZE hex default 0x4000 help This option determines the size of the heap within the SMM handler modules. 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 default y if NORTHBRIDGE_INTEL_GM45 default y if NORTHBRIDGE_INTEL_IRONLAKE default n config SERIALIZED_SMM_INITIALIZATION bool default n help On some CPUs, there is a race condition in SMM. This can occur when both hyperthreads change SMM state variables in parallel without coordination. Setting this option serializes the SMM initialization to avoid an ugly hang in the boot process at the cost of a slightly longer boot time. 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.