diff options
| author | Patrick Rudolph <patrick.rudolph@9elements.com> | 2019-09-26 10:26:49 +0200 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2019-10-01 15:10:16 +0000 |
| commit | 6e079dc120a4aa95a25cfe536d4b1acd178918fd (patch) | |
| tree | c8b1d76e5dd361964389c0f628b162102e72add1 /src/cpu/intel/hyperthreading/intel_sibling.c | |
| parent | 5adbc767f66224e617b6c8204a868542b8010999 (diff) | |
cpu/intel/common: Move intel_ht_sibling() to common folder
Make intel_ht_sibling() available on all platforms.
Will be used in MP init to only write "Core" MSRs from one thread
on HyperThreading enabled platforms, to prevent race conditions and
resulting #GP if MSRs are written twice or are already locked.
Change-Id: I5d000b34ba4c6536dc866fbaf106b78e905e3e35
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35619
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Diffstat (limited to 'src/cpu/intel/hyperthreading/intel_sibling.c')
| -rw-r--r-- | src/cpu/intel/hyperthreading/intel_sibling.c | 24 |
1 files changed, 0 insertions, 24 deletions
diff --git a/src/cpu/intel/hyperthreading/intel_sibling.c b/src/cpu/intel/hyperthreading/intel_sibling.c index 3c3e53a839..f5bcc87a10 100644 --- a/src/cpu/intel/hyperthreading/intel_sibling.c +++ b/src/cpu/intel/hyperthreading/intel_sibling.c @@ -25,30 +25,6 @@ static int first_time = 1; static int disable_siblings = !CONFIG(LOGICAL_CPUS); -/* Return true if running thread does not have the smallest lapic ID - * within a CPU core. - */ -int intel_ht_sibling(void) -{ - unsigned int core_ids, apic_ids, threads; - - apic_ids = 1; - if (cpuid_eax(0) >= 1) - apic_ids = (cpuid_ebx(1) >> 16) & 0xff; - if (apic_ids < 1) - apic_ids = 1; - - core_ids = 1; - if (cpuid_eax(0) >= 4) { - struct cpuid_result result; - result = cpuid_ext(4, 0); - core_ids += (result.eax >> 26) & 0x3f; - } - - threads = (apic_ids / core_ids); - return !!(lapicid() & (threads-1)); -} - void intel_sibling_init(struct device *cpu) { unsigned int i, siblings; |