Date: Tue, 25 Oct 2005 10:02:45 -0700 From: "Singh, Vijay" <Vijay.Singh@netapp.com> To: "Dinesh Nair" <dinesh@alphaque.com> Cc: freebsd-hackers@freebsd.org Subject: RE: correct use of bus_dmamap_sync Message-ID: <637A278D8D0DBC438EA5E75C6E1818B9063C0E64@magenta.hq.netapp.com>
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man bus_dma(9)
> -----Original Message-----
> From: Dinesh Nair [mailto:dinesh@alphaque.com]=20
> Sent: Tuesday, October 25, 2005 7:03 AM
> To: Dinesh Nair
> Cc: freebsd-hackers@freebsd.org
> Subject: Re: correct use of bus_dmamap_sync
>=20
>=20
>=20
> On 10/25/05 21:15 Dinesh Nair said the following:
> > the pseudo code for the read and write, called during an interrupt=20
> > cycle, are:
> >=20
> > rx_func()
> > {
> > POSITION A
> >=20
> > while(there_is_some_data) {
> > memcpy(somebuf, readbuf)
> > }
> > POSITION B
> > }
> >=20
> > tx_func()
> > {
> > POSITION C
> >=20
> > while(there_is_some_data) {
> > memcpy(writebuf, somebuf)
> > }
> > POSITION D
> > }
> >=20
> > the question is, what op should i use for bus_dmamap_sync=20
> in positions=20
> > A, B, C and D ?
>=20
> responding to my own request, i mean which of=20
> BUS_DMASYNC_PREREAD, BUS_DMASYNC_POSTREAD,=20
> BUS_DMASYNC_PREWRITE, BUS_DMASYNC_POSTWRITE should i use, and where ?
>=20
> --=20
> Regards, /\_/\ "All dogs go to heaven."
> dinesh@alphaque.com (0 0) http://www.alphaque.com/
> =
+=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D----oOO--(_)--OOo----=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> +=3D=3D+
> | for a in past present future; do =20
> |
> | for b in clients employers associates relatives=20
> neighbours pets; do |
> | echo "The opinions here in no way reflect the opinions of=20
> my $a $b." |
> | done; done =20
> |
> =
+=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> +=3D=3D+
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>=20
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