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@@ -35,6 +35,43 @@ EFI_PEI_PPI_DESCRIPTOR mPeiSecPlatformInformationPpi[] = {
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}
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};
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+/**
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+ Migrates the Global Descriptor Table (GDT) to permanent memory.
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+
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+ @retval EFI_SUCCESS The GDT was migrated successfully.
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+ @retval EFI_OUT_OF_RESOURCES The GDT could not be migrated due to lack of available memory.
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+
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+**/
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+EFI_STATUS
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+MigrateGdt (
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+ VOID
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+ )
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+{
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+ EFI_STATUS Status;
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+ UINTN GdtBufferSize;
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+ IA32_DESCRIPTOR Gdtr;
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+ VOID *GdtBuffer;
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+
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+ AsmReadGdtr ((IA32_DESCRIPTOR *) &Gdtr);
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+ GdtBufferSize = sizeof (IA32_SEGMENT_DESCRIPTOR) -1 + Gdtr.Limit + 1;
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+
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+ Status = PeiServicesAllocatePool (
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+ GdtBufferSize,
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+ &GdtBuffer
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+ );
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+ ASSERT (GdtBuffer != NULL);
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+ if (EFI_ERROR (Status)) {
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+ return EFI_OUT_OF_RESOURCES;
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+ }
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+
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+ GdtBuffer = ALIGN_POINTER (GdtBuffer, sizeof (IA32_SEGMENT_DESCRIPTOR));
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+ CopyMem (GdtBuffer, (VOID *) Gdtr.Base, Gdtr.Limit + 1);
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+ Gdtr.Base = (UINTN) GdtBuffer;
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+ AsmWriteGdtr (&Gdtr);
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+
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+ return EFI_SUCCESS;
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+}
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+
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//
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// These are IDT entries pointing to 10:FFFFFFE4h.
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//
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@@ -409,6 +446,14 @@ SecTemporaryRamDone (
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//
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State = SaveAndDisableInterrupts ();
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+ //
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+ // Migrate GDT before NEM near down
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+ //
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+ if (PcdGetBool (PcdMigrateTemporaryRamFirmwareVolumes)) {
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+ Status = MigrateGdt ();
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+ ASSERT_EFI_ERROR (Status);
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+ }
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+
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//
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// Disable Temporary RAM after Stack and Heap have been migrated at this point.
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//
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