__HYPERCALL_ARG2REG 100 include/asm-x86/xen/hypercall.h register unsigned long __arg2 asm(__HYPERCALL_ARG2REG) = __arg2; \ __HYPERCALL_ARG2REG 128 include/asm-x86/xen/hypercall.h #define __HYPERCALL_CLOBBER1 __HYPERCALL_CLOBBER2, __HYPERCALL_ARG2REG