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| author | Kyösti Mälkki <kyosti.malkki@gmail.com> | 2012-06-27 16:14:49 +0300 |
|---|---|---|
| committer | Sven Schnelle <svens@stackframe.org> | 2012-07-02 15:49:07 +0200 |
| commit | 9ed1456eff73d1a268eabb84176dd2a2107bf2d7 (patch) | |
| tree | 9811746255b0c2b168f15b76e1375d91280beb28 /src/cpu/intel/hyperthreading | |
| parent | ac6e3172ff7c1c11da59c488b239d08af1248503 (diff) | |
| download | coreboot-9ed1456eff73d1a268eabb84176dd2a2107bf2d7.tar.xz | |
Intel CPUs: execute microcode update only once per core
Early HT-enabled CPUs do not serialize microcode updates within a core.
Solve this by running microcode updates on the thread with the smallest
lapic ID of a core only.
Also set MTRRs once per core only.
Change-Id: I6a3cc9ecec2d8e0caed29605a9b19ec35a817620
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/1142
Tested-by: build bot (Jenkins)
Reviewed-by: Sven Schnelle <svens@stackframe.org>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Diffstat (limited to 'src/cpu/intel/hyperthreading')
| -rw-r--r-- | src/cpu/intel/hyperthreading/intel_sibling.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/src/cpu/intel/hyperthreading/intel_sibling.c b/src/cpu/intel/hyperthreading/intel_sibling.c index 2d2e105f8d..b9a9ae7bb1 100644 --- a/src/cpu/intel/hyperthreading/intel_sibling.c +++ b/src/cpu/intel/hyperthreading/intel_sibling.c @@ -14,6 +14,27 @@ 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) + core_ids += (cpuid_eax(4) >> 26) & 0x3f; + + threads = (apic_ids / core_ids); + return !!(lapicid() & (threads-1)); +} + void intel_sibling_init(device_t cpu) { unsigned i, siblings; |