linux-kernel - Re: linux cache routines for Write-back cache policy on MIPS24KE

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Message-ID: <302271.86305.qm@web8404.mail.in.yahoo.com>
Date:	Mon, 1 Oct 2007 11:51:21 +0100 (BST)
From:	veerasena reddy <veerasena_b@...oo.co.in>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	linux-mips <linux-mips@...ux-mips.org>,
	"linux-kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: linux cache routines for Write-back cache policy on  MIPS24KE

Hi Geert,

Thanks for your repsonse.

In linux-2.6.18 (for MIPS24KE processor):
suppose if i want to do flush only then which API i
should use?
Similarly, if i want to do invalidation only which API
i should use?

Thanks again.

Regards,
Veerasena.
--- Geert Uytterhoeven <geert@...ux-m68k.org> wrote:

> On Mon, 1 Oct 2007, veerasena reddy wrote:
> > I have ported Linux-2.6.18 kernel on MIPS24KE
> > processor. I am using write back cache policy.
> > 
> > Could you please guide me under what cases the
> below
> > cache API's are being used:
> > - dma_cache_wback_inv() : Could you explain  what
> > exactly this function does
> 
> It does both write back and invalidate.
> 
> > - dma_cache_wback() : This function write back the
> > cache data to memory
> > - dma_cache_inv  : This function invalidate the
> cache
> > tags. so subsequent access will fetch from memory.
> 
> Note that 2.6.18 is old. The above functions are
> intended to be removed.
> 
> Gr{oetje,eeting}s,
> 
> 						Geert
> 
> --
> Geert Uytterhoeven -- There's lots of Linux beyond
> ia32 -- geert@...ux-m68k.org
> 
> In personal conversations with technical people, I
> call myself a hacker. But
> when I'm talking to journalists I just say
> "programmer" or something like that.
> 							    -- Linus Torvalds
> 



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