NV40_USER_SIZE
#define NV40_USER(i) (0x00c00000+(i*NV40_USER_SIZE))
#define NV40_USER_DMA_PUT(i) (0x00c00040+(i*NV40_USER_SIZE))
#define NV40_USER_DMA_GET(i) (0x00c00044+(i*NV40_USER_SIZE))
#define NV40_USER_REF_CNT(i) (0x00c00048+(i*NV40_USER_SIZE))