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This library class will enable driver modules (a) to query whether S3 support was enabled on the QEMU command line, (b) to produce fw_cfg DMA operations that are to be replayed at S3 resume time. Declare the library class in OvmfPkg/OvmfPkg.dec, and add the library class header under OvmfPkg/Include/Library/. At the moment, the only API we expose is QemuFwCfgS3Enabled(), which we'll first migrate from QemuFwCfgLib. Further interfaces will be added in later patches. Cc: Jordan Justen <jordan.l.justen@intel.com> Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=394 Suggested-by: Jordan Justen <jordan.l.justen@intel.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>