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//0x20 bytes (sizeof)
struct _KIST_BASE_FRAME
{
    struct _KPCR* KernelGsBase;                                             //0x0
    struct _KIST_LINK_FRAME* IstStack;                                      //0x8
    ULONGLONG PreviousGsBase;                                               //0x10
    ULONGLONG PreviousCr3;                                                  //0x18
};