DMAC1_ALLMASK
dma8237_write(pp, DMAC1_ALLMASK, ~(1 << chn));
dma8237_write(pp, DMAC1_ALLMASK, 0);
mask = inb(DMAC1_ALLMASK) >> (chnl);
&dma_reg->sb_dma_regs[DMAC1_ALLMASK], ~chn_mask);
&dma_reg->sb_dma_regs[DMAC1_ALLMASK], 0);
#define BEGIN_ISADMA(o, v) ((o) == DMAC1_ALLMASK && (v))
#define END_ISADMA(o, v) ((o) == DMAC1_ALLMASK && (v) == 0)