4a2ce029fb
Improve boot time performances by replacing the wbinvd instruction with multiple clflush to ensure that the SIPI data is written back to RAM. According to some experimental measurements, the wbinvd execution takes between 1.6 up and 6 milliseconds to complete. In the case of the SIPI data, wbinvd unnecessarily flushes and invalidates the entire cache. Indeed, the SIPI module is quite small (about 400 bytes) and cflush'ing the associated cache lines is almost instantaneous, typically less than 100 microseconds. BUG=b/260455826 TEST=Successful boot on Skolas and Rex board Change-Id: I0e00db8eaa6a3cb41bec3422572c8f2a9bec4057 Signed-off-by: Jeremy Compostella <jeremy.compostella@intel.com> Suggested-by: Erin Park <erin.park@intel.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/75391 Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com> Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Arthur Heymans <arthur@aheymans.xyz> |
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