IDENTITY_FRAME_BIT   36 arch/x86/include/asm/xen/page.h #define IDENTITY_FRAME(m)	((m) | IDENTITY_FRAME_BIT)
IDENTITY_FRAME_BIT   76 arch/x86/include/asm/xen/page.h 		mfn &= ~(FOREIGN_FRAME_BIT | IDENTITY_FRAME_BIT);