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authorZachary Amsden <zach@vmware.com>2005-09-03 18:56:36 -0400
committerLinus Torvalds <torvalds@evo.osdl.org>2005-09-05 03:06:11 -0400
commit4bb0d3ec3e5b1e9e2399cdc641b3b6521ac9cdaa (patch)
tree5e8d7646f5c6a2cec990b6d591f230d496b20664 /include/asm-i386/agp.h
parent2a0694d15d55d0deed928786a6393d5e45e37d76 (diff)
[PATCH] i386: inline asm cleanup
i386 Inline asm cleanup. Use cr/dr accessor functions. Also, a potential bugfix. Also, some CR accessors really should be volatile. Reads from CR0 (numeric state may change in an exception handler), writes to CR4 (flipping CR4.TSD) and reads from CR2 (page fault) prevent instruction re-ordering. I did not add memory clobber to CR3 / CR4 / CR0 updates, as it was not there to begin with, and in no case should kernel memory be clobbered, except when doing a TLB flush, which already has memory clobber. I noticed that page invalidation does not have a memory clobber. I can't find a bug as a result, but there is definitely a potential for a bug here: #define __flush_tlb_single(addr) \ __asm__ __volatile__("invlpg %0": :"m" (*(char *) addr)) Signed-off-by: Zachary Amsden <zach@vmware.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-i386/agp.h')
-rw-r--r--include/asm-i386/agp.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/asm-i386/agp.h b/include/asm-i386/agp.h
index b82f5f3ab887..9075083bab76 100644
--- a/include/asm-i386/agp.h
+++ b/include/asm-i386/agp.h
@@ -19,7 +19,7 @@ int unmap_page_from_agp(struct page *page);
19/* Could use CLFLUSH here if the cpu supports it. But then it would 19/* Could use CLFLUSH here if the cpu supports it. But then it would
20 need to be called for each cacheline of the whole page so it may not be 20 need to be called for each cacheline of the whole page so it may not be
21 worth it. Would need a page for it. */ 21 worth it. Would need a page for it. */
22#define flush_agp_cache() asm volatile("wbinvd":::"memory") 22#define flush_agp_cache() wbinvd()
23 23
24/* Convert a physical address to an address suitable for the GART. */ 24/* Convert a physical address to an address suitable for the GART. */
25#define phys_to_gart(x) (x) 25#define phys_to_gart(x) (x)