From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ed L Cashin <ecashin@uga.edu>
Date: Wed, 28 Jan 2004 20:42:38 +0000
Subject: the late arch/sparc64/mm/init.c:__flush_cache_all
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List-Id: <sparclinux.vger.kernel.org>
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To: sparclinux@vger.kernel.org

Hi.  I'm trying to find out which function to use to flush or disable
the ultrasparc's dcache, icache, and ecache.  On my way, I discovered
the __flush_cache_all function in arch/sparc64/mm/init.c.  It is
absent from the current kernel, but it was present a few months ago.

void __flush_cache_all(void)
{
	/* Cheetah should be fine here too. */
	if (tlb_type = spitfire) {
		unsigned long va;

		flushw_all();
		for (va =  0; va < (PAGE_SIZE << 1); va += 32)
			spitfire_put_icache_tag(va, 0x0);
		__asm__ __volatile__("flush %g6");
	}
}

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.

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

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/