diff options
Diffstat (limited to 'include/asm-i386/agp.h')
| -rw-r--r-- | include/asm-i386/agp.h | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/include/asm-i386/agp.h b/include/asm-i386/agp.h new file mode 100644 index 000000000000..a917ff50354f --- /dev/null +++ b/include/asm-i386/agp.h @@ -0,0 +1,24 @@ +#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 |