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that assumes the SMRAM reserved range is only at the end of the SMRAM descriptor. // // This range has reserved area, calculate the left free size // gSmmCorePrivate->SmramRanges[Index].PhysicalSize = SmramResRegion->SmramReservedStart - gSmmCorePrivate->SmramRanges[Index].CpuStart; Imagine the following scenario where we just reserve the first page of the SMRAM range: SMRAM Descriptor: Start: 0x80000000 Size: 0x02000000 Reserved Range: Start: 0x80000000 Size: 0x00001000 In this case the adjustment to the SMRAM range size yields zero: ReservedStart - SMRAM Start is 0x80000000 - 0x80000000 = 0. So even though most of the range is still free the IPL code decides its unusable. The problem comes from the email thread: [edk2] PiSmmIpl SMRAM Reservation Logic. http://thread.gmane.org/gmane.comp.bios.tianocore.devel/15268 Also to follow the idea in the email thread, the patch is to 1. Keep only one copy of full SMRAM ranges in gSmmCorePrivate->SmramRanges, split record for SmmConfiguration->SmramReservedRegions and SMM Core that will be marked to be EFI_ALLOCATED in gSmmCorePrivate->SmramRanges. 2. Handle SmmConfiguration->SmramReservedRegions at beginning of, at end of, in the middle of, or cross multiple SmramRanges. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Star Zeng <star.zeng@intel.com> Reviewed-by: Jiewen Yao <jiewen.yao@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18031 6f19259b-4bc3-4df7-8a09-765794883524
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Acidanthera UEFI Development Kit based on EDK II edk2-stable202405
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