kernel-ark/include/asm-i386/agp.h
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

25 lines
803 B
C

#ifndef AGP_H
#define AGP_H 1
#include <asm/pgtable.h>
#include <asm/cacheflush.h>
/*
* Functions to keep the agpgart mappings coherent with the MMU.
* The GART gives the CPU a physical alias of pages in memory. The alias region is
* mapped uncacheable. Make sure there are no conflicting mappings
* with different cachability attributes for the same page. This avoids
* data corruption on some CPUs.
*/
int map_page_into_agp(struct page *page);
int unmap_page_from_agp(struct page *page);
#define flush_agp_mappings() global_flush_tlb()
/* Could use CLFLUSH here if the cpu supports it. But then it would
need to be called for each cacheline of the whole page so it may not be
worth it. Would need a page for it. */
#define flush_agp_cache() asm volatile("wbinvd":::"memory")
#endif