__HYPERCALL_ARG1REG 99 include/asm-x86/xen/hypercall.h register unsigned long __arg1 asm(__HYPERCALL_ARG1REG) = __arg1; \ __HYPERCALL_ARG1REG 129 include/asm-x86/xen/hypercall.h #define __HYPERCALL_CLOBBER0 __HYPERCALL_CLOBBER1, __HYPERCALL_ARG1REG