x86/bios/local.S - kvmtool - Git at Google

 /*
  * Local variables for almost every BIOS irq handler
  * Must be put somewhere inside irq handler body
  */
 __CALLER_SS:		.int  0
 __CALLER_SP:		.long 0
 __CALLER_CLOBBER:	.long 0
	/*
	* Local variables for almost every BIOS irq handler
	* Must be put somewhere inside irq handler body
	*/
	__CALLER_SS: .int 0
	__CALLER_SP: .long 0
	__CALLER_CLOBBER: .long 0