mirror of
https://github.com/acidanthera/audk.git
synced 2025-04-08 17:05:09 +02:00
4a0f88dd64
On S3 path, we will wake up APs to restore CPU context in PiSmmCpuDxeSmm driver. However, we place AP in hlt-loop under 1MB space borrowed after CPU restoring CPU contexts. In case, one NMI or SMI happens, APs may exit from hlt state and execute the instruction after HLT instruction. But the code under 1MB is no longer safe at that time. This fix is to allocate one ACPI NVS range to place the AP hlt-loop code. When CPU finished restoration CPU contexts, AP will execute in this ACPI NVS range. https://bugzilla.tianocore.org/show_bug.cgi?id=216 v2: 1. Make stack alignment per Laszlo's comment. 2. Trim whitespace at end of end. 3. Update year mark in file header. Reported-by: Laszlo Ersek <lersek@redhat.com> Analyzed-by: Paolo Bonzini <pbonzini@redhat.com> Analyzed-by: Laszlo Ersek <lersek@redhat.com> Cc: Laszlo Ersek <lersek@redhat.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Jiewen Yao <jiewen.yao@intel.com> Cc: Michael D Kinney <michael.d.kinney@intel.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Jeff Fan <jeff.fan@intel.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Jiewen Yao <jiewen.yao@intel.com> Tested-by: Laszlo Ersek <lersek@redhat.com>