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cpu/x86/lapic: Unconditionally use CPUID leaf 0xb if available

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Even when we're not in X2APIC mode, the information in CPUID
leaf 0xb will be valid if that leaf is implemented on the CPU.

Change-Id: I0f1f46fe5091ebeab6dfb4c7e151150cf495d0cb
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58386
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Wonkyu Kim <wonkyu.kim@intel.com>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
This commit is contained in:
Kyösti Mälkki
2021-10-16 18:12:53 +03:00
parent 2c079fce45
commit ceaf959678
2 changed files with 8 additions and 13 deletions
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2
src/include/cpu/x86/lapic.h
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@@ -126,7 +126,7 @@ static __always_inline int lapic_busy(void)
static __always_inline unsigned int initial_lapicid(void)
{
uint32_t lapicid;
if (is_x2apic_mode() && cpuid_get_max_func() >= 0xb)
if (cpuid_get_max_func() >= 0xb)
lapicid = cpuid_ext(0xb, 0).edx;
else
lapicid = cpuid_ebx(1) >> 24;