Re: the late arch/sparc64/mm/init.c:__flush_cache_all

["David S. Miller" <davem@redhat.com>]

On Wed, 28 Jan 2004 15:42:38 -0500
Ed L Cashin <ecashin@uga.edu> wrote:

> My first question is why the function was removed.  With Seth Arnold's
> help, I found the patch at bkbits.net that removes __flush_cache_all,
> but the only clue is the subject header, "[SPARC64]: vmap/vunmap cache
> flushing need not do anything."  I don't really understand why the
> function was removed.

Because we no longer need to flush the whole thing in the kernel
any more, only specific addresses.

> Can use flushw_all and flush g6 to clear the dcache, icache, and
> ecache?

No, flushw_all() flushes the cpu register windows and "flush g6" flushes
one cacheline in the instruction cache.

Please download the UltraSPARC programmers manual from, for example:

	http://www.sun.com/processors/manuals/805-0087.pdf

to learn how to program the chip.


> Also, and less important---in __flush_cache_all's inline asm, I
> expected the percent sign to be escaped, as in the other init.c
> functions.  Why is there only one percent sign?
> 
> -- 
> --Ed L Cashin            |   PGP public key:
>   ecashin@uga.edu        |   http://noserose.net/e/pgp/
> 
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