taglinefilesource code
usp90arch/alpha/boot/main.cpcb_va->usp = 0;
usp73arch/alpha/kernel/process.cp->tss.usp = rdusp();
usp78arch/sparc/kernel/process.cp->tss.usp = (unsigned long) childregs;
usp8include/asm-alpha/hwrpb.hunsigned long usp;
usp34include/asm-alpha/processor.hunsigned long usp;
usp47include/asm-sparc/processor.hunsigned long usp;          /* user's sp, throw reg windows here */