nx defines

#define PG_DIRTY_BIT	6

#define PG_PSE_BIT	7

#define PG_GLOBAL_BIT	8

#define PG_NX_BIT	63

#define PG_PRESENT_MASK  (1 << PG_PRESENT_BIT)

#define PG_RW_MASK	 (1 << PG_RW_BIT)

#define PG_DIRTY_MASK	 (1 << PG_DIRTY_BIT)

#define PG_PSE_MASK	 (1 << PG_PSE_BIT)

#define PG_GLOBAL_MASK	 (1 << PG_GLOBAL_BIT)

#define PG_NX_MASK	 (1LL << PG_NX_BIT)

#define PG_ERROR_W_BIT     1

#define PG_ERROR_W_MASK    (1 << PG_ERROR_W_BIT)

#define PG_ERROR_U_MASK    0x04

#define PG_ERROR_RSVD_MASK 0x08

#define PG_ERROR_I_D_MASK  0x10

#define MSR_IA32_APICBASE               0x1b

#define MSR_IA32_APICBASE_BSP           (1<<8)