Use PSL_KERNEL as upcall thread's initial rflags, don't use scratch user rflags.
Use PSL_KERNEL as upcall thread's initial rflags, don't use
scratch user rflags.

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase