PG_FRAME
#define PG_FRAME 0xfffff000
#define PG_FRAME ALPHA_PTE_PFN
#define PG_FRAME 0x000ffffffffff000UL
#define PG_FRAME 0xfffff000 /* page frame mask */
#define PG_FRAME 0xffffff000ULL /* page frame mask */
#define PG_FRAME 0xfffff000
#define PG_FRAME ((1ULL << PG_FRAMEBITS) - (1ULL << PG_SHIFT))