Date: Tue, 25 Oct 2005 22:02:44 +0800 From: Dinesh Nair <dinesh@alphaque.com> To: Dinesh Nair <dinesh@alphaque.com> Cc: freebsd-hackers@freebsd.org Subject: Re: correct use of bus_dmamap_sync Message-ID: <435E3B04.7060306@alphaque.com> In-Reply-To: <435E3003.4050609@alphaque.com> References: <435E3003.4050609@alphaque.com>
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On 10/25/05 21:15 Dinesh Nair said the following:
> the pseudo code for the read and write, called during an interrupt
> cycle, are:
>
> rx_func()
> {
> POSITION A
>
> while(there_is_some_data) {
> memcpy(somebuf, readbuf)
> }
> POSITION B
> }
>
> tx_func()
> {
> POSITION C
>
> while(there_is_some_data) {
> memcpy(writebuf, somebuf)
> }
> POSITION D
> }
>
> the question is, what op should i use for bus_dmamap_sync in positions
> A, B, C and D ?
responding to my own request, i mean which of BUS_DMASYNC_PREREAD,
BUS_DMASYNC_POSTREAD, BUS_DMASYNC_PREWRITE, BUS_DMASYNC_POSTWRITE should i
use, and where ?
--
Regards, /\_/\ "All dogs go to heaven."
dinesh@alphaque.com (0 0) http://www.alphaque.com/
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