I'm trying to understand why gdtPtr.Base is casting to (UINT32)? 1) gdtPtr.Base is a a UINTN 2) It is legal for AllocateRuntimePool() to return an address > 4GB
It seems like the code should just cast to (UINTN)? https://github.com/tianocore/edk2/blob/master/UefiCpuPkg/CpuDxe/CpuGdt.c#L151 VOID InitGlobalDescriptorTable ( VOID ) { GDT_ENTRIES *gdt; IA32_DESCRIPTOR gdtPtr; // // Allocate Runtime Data for the GDT // gdt = AllocateRuntimePool (sizeof (GdtTemplate) + 8); ASSERT (gdt != NULL); gdt = ALIGN_POINTER (gdt, 8); // // Initialize all GDT entries // CopyMem (gdt, &GdtTemplate, sizeof (GdtTemplate)); // // Write GDT register // gdtPtr.Base = (UINT32)(UINTN)(VOID*) gdt; gdtPtr.Limit = (UINT16) (sizeof (GdtTemplate) - 1); AsmWriteGdtr (&gdtPtr); Thanks, Andrew Fish _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel
