From: "George G. Davis" <gdavis@mvista.com>
To: Daniel THOMPSON <daniel.thompson@st.com>
Cc: Tom Cooksey <thomas.cooksey@trolltech.com>,
Bill Gatliff <bgat@billgatliff.com>,
Robert Schwebel <r.schwebel@pengutronix.de>,
linux-embedded mailing list <linux-embedded@vger.kernel.org>
Subject: Re: Getting physical addresses of mmap'd pages from userspace
Date: Mon, 13 Oct 2008 13:21:24 -0400 [thread overview]
Message-ID: <20081013172124.GF2556@mvista.com> (raw)
In-Reply-To: <48F364B0.2060407@st.com>
On Mon, Oct 13, 2008 at 04:09:36PM +0100, Daniel THOMPSON wrote:
> Tom Cooksey wrote:
> > Yup, I think that's what I'm going to end up having to do. Even if I can get
> > the physical address, I need some way to flush the CPU cache to RAM before I
> > ask the GPU to blit. I doubt there's any way to do that from userspace. :-( I'm
> > not even sure of the kernel API to do it. Any ideas?
>
> MIPS has it: http://www.linux-mips.org/wiki/Cacheflush_Syscall
> and so does SH. I'm afraid I don't know about ARM though.
ARM also implements sys_cacheflush(start, end /* exclusive */, 0) but
does not provide separate methods for I or D cache as in the MIPS docs
above, ARM sys_cacheflush'es both I+D caches.
--
Regards,
George
>
> --
> Daniel Thompson (STMicroelectronics) <daniel.thompson@st.com>
> 1000 Aztec West, Almondsbury, Bristol, BS32 4SQ. 01454 462659
>
> If a car is a horseless carriage then is a motorcycle a horseless horse?
> --
> To unsubscribe from this list: send the line "unsubscribe linux-embedded" in
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next prev parent reply other threads:[~2008-10-13 17:21 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-10 16:15 Getting physical addresses of mmap'd pages from userspace Tom Cooksey
2008-10-10 16:37 ` Bart Van Assche
2008-10-10 19:12 ` Robert Schwebel
2008-10-13 6:33 ` Tom Cooksey
2008-10-13 7:00 ` Robert Schwebel
2008-10-13 7:20 ` Tom Cooksey
2008-10-13 7:28 ` Thomas Petazzoni
2008-10-13 7:31 ` Robert Schwebel
2008-10-13 12:50 ` Bill Gatliff
2008-10-13 13:23 ` Robert Schwebel
2008-10-13 15:58 ` George G. Davis
2008-10-13 16:09 ` Robert Schwebel
2008-10-14 6:36 ` Tom Cooksey
2008-10-14 15:47 ` Bill Gatliff
2008-10-15 7:06 ` Tom Cooksey
2008-10-15 8:30 ` James Chapman
2008-10-15 18:27 ` Robert Schwebel
2008-10-15 18:29 ` Bill Gatliff
2008-10-13 9:37 ` Gilad Ben-Yossef
[not found] ` <48F31155.6090603@codefidence.com>
2008-10-13 9:38 ` Tom Cooksey
2008-10-13 12:48 ` Bill Gatliff
2008-10-13 14:45 ` Tom Cooksey
2008-10-13 15:09 ` Daniel THOMPSON
2008-10-13 17:21 ` George G. Davis [this message]
2008-10-13 17:29 ` Chris
2008-10-14 6:46 ` Tom Cooksey
2008-10-14 7:31 ` Daniel J Laird
2008-10-14 9:03 ` Tom Cooksey
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