diff options
| author | Subrata Banik <subratabanik@google.com> | 2022-07-12 10:55:21 +0000 |
|---|---|---|
| committer | Felix Held <felix-coreboot@felixheld.de> | 2022-07-18 15:40:46 +0000 |
| commit | 2125a17c6a749651945a52ff39cbc8e81c3dcbd8 (patch) | |
| tree | 5348508282dea5e7c337bb224c135c09bd95ffe1 /src/cpu/x86/Kconfig | |
| parent | c7c746c3b2cab52a80719bba39cbdc9ea4babb35 (diff) | |
arch/x86: Add X2APIC_LATE_WORKAROUND
Add option to do AP bringup with LAPICs in XAPIC mode and
switch to X2APIC later in CPU init.
Change-Id: I94c9daa3bc7173628f84094a3d5ca59e699ad334
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/65766
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
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 |