From 816242da3735957bee99aeba40aa60c4f120a101 Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Mon, 23 May 2005 15:52:08 -0700 Subject: [SPARC64]: Add boot option to force UltraSPARC-III P-Cache on. Older UltraSPARC-III chips have a P-Cache bug that makes us disable it by default at boot time. However, this does hurt performance substantially, particularly with memcpy(), and the bug is _incredibly_ obscure. I have never seen it triggered in practice, ever. So provide a "-P" boot option that forces the P-Cache on. It taints the kernel, so if it does trigger and cause some data corruption or OOPS, we will find out in the logs that this option was on when it happened. Signed-off-by: David S. Miller --- include/asm-sparc64/spitfire.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'include/asm-sparc64/spitfire.h') diff --git a/include/asm-sparc64/spitfire.h b/include/asm-sparc64/spitfire.h index ad78ce64d69e..9d7613eea812 100644 --- a/include/asm-sparc64/spitfire.h +++ b/include/asm-sparc64/spitfire.h @@ -48,6 +48,9 @@ enum ultra_tlb_layout { extern enum ultra_tlb_layout tlb_type; +extern int cheetah_pcache_forced_on; +extern void cheetah_enable_pcache(void); + #define sparc64_highest_locked_tlbent() \ (tlb_type == spitfire ? \ SPITFIRE_HIGHEST_LOCKED_TLBENT : \ -- cgit v1.2.3