get_scsi_dma
static inline u_long get_scsi_dma(volatile uint8_t *);
leftover = get_scsi_dma(SCSI_DMA->s_dma_cnt);
byte_p = (uint8_t *)get_scsi_dma(SCSI_DMA->s_dma_ptr);
cnt = (u_long)dma_ptr - get_scsi_dma(SCSI_DMA->s_dma_ptr);
tmp = get_scsi_dma(SCSI_DMA->s_dma_cnt);
count = get_scsi_dma(SCSI_DMA->s_dma_cnt);
dma_ptr = (uint8_t *)get_scsi_dma(SCSI_DMA->s_dma_ptr);