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Notes on CPU compatibility

List of required features. Note: wide support means both AMD and Intel.

Greentea OS targets CPUs at least from Q3 2011 and newer

  • SSE2 is mandatory on AMD64
  • NX bit should be present on all AMD64, but may be disabled, does not affect system working
  • SSE3 wide support since 2005
  • CMPXCHG16B wide support since 2006
  • PrefetchW wide support since 2006
  • LAHF/SAHF wide support since 2005
  • POPCNT wide support since 2008
  • 2 MB huge pages seems to be mandatory on AMD64
  • I/O APIC mandatory on multicore AMD64
  • ACPI 2.0 required by Tofita
  • SSE4.1 wide support since 2011 (CPU with SSE4.1 will have SSE3 and SSSE3)
  • SSSE3 wide support since 2011
  • SSE4.2 wide support since 2011

Optional features:

  • 1 GB huge pages (aka PDPE1GB) wide support since 2012 and used as optimization
  • x2APIC is optional on AMD and used by Greentea if present
  • AVX wide support since 2011 (except all Atoms, some modern Pentiums & Celerons, old Xeons)

Not required features:

  • SSE4a seems like AMD-only and not used by Greentea
  • AVX2 introduced in 2013 and not used by Greentea (available for third-party apps)
  • AVX-512 introduced in 2016 and not used by Greentea