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Diffstat (limited to 'src/cpu/x86/Kconfig')
| -rw-r--r-- | src/cpu/x86/Kconfig | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/src/cpu/x86/Kconfig b/src/cpu/x86/Kconfig index 5b9279511d..1617ad6953 100644 --- a/src/cpu/x86/Kconfig +++ b/src/cpu/x86/Kconfig @@ -51,6 +51,17 @@ config X2APIC_RUNTIME 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 < 255 + 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 |