Shim.c

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#include <Uefi.h>
#include <ShimVars.h>
#include <Library/UefiRuntimeServicesTableLib.h>
 
EFI_STATUS
OcShimRetainProtocol (
  IN BOOLEAN  Required
  )
{
  UINT8  ShimRetainProtocol;
 
  if (!Required) {
    return EFI_SUCCESS;
  }
 
  ShimRetainProtocol = 1;
 
  return gRT->SetVariable (
                SHIM_RETAIN_PROTOCOL,
                &gShimLockGuid,
                EFI_VARIABLE_BOOTSERVICE_ACCESS,
                sizeof (ShimRetainProtocol),
                &ShimRetainProtocol
                );
}