/*
* Common functin for mmap(2)'ing DMA-safe memory. May be called by
* bus-specific DMA mmap(2)'ing functions.
*/
paddr_t
_bus_dmamem_mmap(bus_dma_tag_t t, bus_dma_segment_t *segs, int nsegs, off_t off,
int prot, int flags)
{
int i;
for (i = 0; i < nsegs; i++) {
#ifdef DIAGNOSTIC
if (off & PGOFSET)
panic("_bus_dmamem_mmap: offset unaligned");
if (segs[i].ds_addr & PGOFSET)
panic("_bus_dmamem_mmap: segment unaligned");
if (segs[i].ds_len & PGOFSET)
panic("_bus_dmamem_mmap: segment size not multiple"
" of page size");
#endif
if (off >= segs[i].ds_len) {
off -= segs[i].ds_len;
continue;
}
/*
* XXXSCW: What about BUS_DMA_COHERENT ??
*/
return m68k_btop((char *)segs[i].ds_addr + off);
}
/* Page not found. */
return -1;
}
paddr_t
grfmmap(dev_t dev, off_t off, int prot)
{
struct grf_softc *sc;
struct macfb_devconfig *dc;
int unit = GRFUNIT(dev);
if (grf_softc == NULL || unit >= numgrf)
return ENXIO;
sc = &grf_softc[unit];
if (sc->mfb_sc == NULL)
return ENXIO;
dc = sc->mfb_sc->sc_dc;
if ((u_int)off < m68k_round_page(dc->dc_offset + dc->dc_size))
return m68k_btop(dc->dc_paddr + off);
return (-1);
}
paddr_t
mmmmap(dev_t dev, off_t off, int prot)
{
/*
* /dev/mem is the only one that makes sense through this
* interface. For /dev/kmem any physaddr we return here
* could be transient and hence incorrect or invalid at
* a later time. /dev/null just doesn't make any sense
* and /dev/zero is a hack that is handled via the default
* pager in mmap().
*/
if (minor(dev) != DEV_MEM)
return -1;
/*
* Allow access only in RAM.
*/
if ((u_int)off < lowram || (u_int)off >= 0xFFFFFFFC)
return -1;
return m68k_btop((u_int)off);
}
