1 files changed, 22 insertions, 0 deletions

diff --git a/include/asm-x86_64/agp.h b/include/asm-x86_64/agp.h
new file mode 100644
index 000000000000..0bb9019d58aa
--- /dev/null
+++ b/include/asm-x86_64/agp.h
@@ -0,0 +1,22 @@
+#ifndef AGP_H
+#define AGP_H 1
+
+#include <asm/cacheflush.h>
+
+/* 
+ * Functions to keep the agpgart mappings coherent.
+ * The GART gives the CPU a physical alias of memory. The alias is
+ * mapped uncacheable. Make sure there are no conflicting mappings
+ * with different cachability attributes for the same page.
+ */
+
+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