VDMA_PAGESIZE
#define VDMA_OFFSET(a) ((unsigned int)(a) & (VDMA_PAGESIZE-1))
laddr = (first << 12) + (paddr & (VDMA_PAGESIZE - 1));
frame = paddr & ~(VDMA_PAGESIZE - 1);
frame += VDMA_PAGESIZE;
frame = paddr & ~(VDMA_PAGESIZE - 1);
return (i << 12) + (paddr & (VDMA_PAGESIZE - 1));
return pgtbl[laddr >> 12].frame + (laddr & (VDMA_PAGESIZE - 1));
paddr += VDMA_PAGESIZE;