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Summary: The Initial Local APIC ID is returned by CPUID function 1 (in EBX). On AMD Family 10h systems the way that ID is built is controlled by an MSR bit (InitApicIdCpuIdLo). BKDG instructs BIOS to set it in a certain way, but a BIOS can be buggy. In that case the ID can confuse tools that use it, e.g. hwloc. For example, on a system that I own real Local APIC IDs are configured as 0, 1, 2, 3, but IDs reported via CPUID.1 are 0, 0x40, 0x80, 0xc0. See: https://github.com/open-mpi/hwloc/issues/183 Reviewed by: kib MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D6060 |
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| .. | ||
| acpica | ||
| amd64 | ||
| cloudabi64 | ||
| conf | ||
| ia32 | ||
| include | ||
| linux | ||
| linux32 | ||
| pci | ||
| vmm | ||
| Makefile | ||