TCE_RPN_MASK       29 arch/powerpc/include/asm/tce.h #define TCE_RPN_MASK		0xfffffffffful  /* 40-bit RPN (4K pages) */
TCE_RPN_MASK       26 arch/x86/include/asm/tce.h #define TCE_RPN_MASK     0x0000fffffffff000ULL