diff options
| author | Wonkyu Kim <wonkyu.kim@intel.com> | 2021-03-22 20:08:11 -0700 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2021-04-15 10:57:12 +0000 |
| commit | bdfa35315fc4b01dcd5ee0fee958c529ad4dacb7 (patch) | |
| tree | 1a1cf208e28ca54911fbec31ee0fd44b6d260459 /src/cpu | |
| parent | 0aeedd42eecee0f1d5b658c3441f8efecb0c6473 (diff) | |
cpu/intel/common: use lapicid api
Use lapicid api to support both x2apic mode and apic mode
BUG=None
BRANCH=None
TEST=boot to OS and check apic mode
cat /proc/cpuinfo | grep "apicid"
Signed-off-by: Wonkyu Kim <wonkyu.kim@intel.com>
Change-Id: I5ca5b09ae67941adcc07dfafdfe4ba78b0f81009
Reviewed-on: https://review.coreboot.org/c/coreboot/+/51725
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src/cpu')
| -rw-r--r-- | src/cpu/intel/common/hyperthreading.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/src/cpu/intel/common/hyperthreading.c b/src/cpu/intel/common/hyperthreading.c index fce7576673..b9c17b6fa1 100644 --- a/src/cpu/intel/common/hyperthreading.c +++ b/src/cpu/intel/common/hyperthreading.c @@ -23,6 +23,14 @@ bool intel_ht_sibling(void) if (!intel_ht_supported()) return false; + if (is_x2apic_mode()) { + if (cpuid_eax(0) >= 0xb) { + result = cpuid_ext(0xb, 0); + const uint32_t div = 1 << (result.eax & 0x1f); + return result.edx % div > 0; + } + } + apic_ids = 1; if (cpuid_eax(0) >= 1) apic_ids = (cpuid_ebx(1) >> 16) & 0xff; |