From 176c8877ce8820ecc4f74748c83ab993b938eac6 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Ky=C3=B6sti=20M=C3=A4lkki?= Date: Sat, 29 May 2021 20:33:22 +0300 Subject: cpu/x86/lapic: Add Kconfig choice LAPIC_ACCESS_MODE MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Allows compile-time optimisation on platforms that do not wish to enable runtime checking of X2APIC. Legacy lapic_cpu_init() is incompatible so there is dependency on PARALLEL_MP. Also stop_this_cpu() is incompatible, so there is dependency on !AP_IN_SIPI_WAIT. Since the code actually lacks enablement of X2APIC (apparently assuming the blob has done it) and the other small flaws pointed out in earlier reviews, X2APIC_RUNTIME is not selected per default on any platform yet. Change-Id: I8269f9639ee3e89a2c2b4178d266ba2dac46db3f Signed-off-by: Kyösti Mälkki Reviewed-on: https://review.coreboot.org/c/coreboot/+/55073 Tested-by: build bot (Jenkins) Reviewed-by: Arthur Heymans Reviewed-by: Angel Pons Reviewed-by: Wonkyu Kim --- src/include/cpu/x86/lapic.h | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'src/include/cpu') diff --git a/src/include/cpu/x86/lapic.h b/src/include/cpu/x86/lapic.h index ab2843f69a..2de5dd57df 100644 --- a/src/include/cpu/x86/lapic.h +++ b/src/include/cpu/x86/lapic.h @@ -10,6 +10,12 @@ static inline bool is_x2apic_mode(void) { + if (CONFIG(XAPIC_ONLY)) + return false; + + if (CONFIG(X2APIC_ONLY)) + return true; + msr_t msr; msr = rdmsr(LAPIC_BASE_MSR); return ((msr.lo & LAPIC_BASE_X2APIC_ENABLED) == LAPIC_BASE_X2APIC_ENABLED); -- cgit v1.2.3