x86: unify include/asm/agp_32/64.h

Same file, except for whitespace, comment formatting and the
usage of wbinvd() instead of asm volatile("wbinvd":::"memory"), which is
the same.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

include/asm-x86/agp.h

@@ -1,5 +1,40 @@
-#ifdef CONFIG_X86_32
-# include "agp_32.h"
-#else
-# include "agp_64.h"
+#ifndef _ASM_X86_AGP_H
+#define _ASM_X86_AGP_H
+
+#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.
+ */
+
+/*
+ * Caller's responsibility to call global_flush_tlb() for performance
+ * reasons
+ */
+#define map_page_into_agp(page) change_page_attr(page, 1, PAGE_KERNEL_NOCACHE)
+#define unmap_page_from_agp(page) change_page_attr(page, 1, PAGE_KERNEL)
+#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() wbinvd()
+
+/* Convert a physical address to an address suitable for the GART. */
+#define phys_to_gart(x) (x)
+#define gart_to_phys(x) (x)
+
+/* GATT allocation. Returns/accepts GATT kernel virtual address. */
+#define alloc_gatt_pages(order)		\
+	((char *)__get_free_pages(GFP_KERNEL, (order)))
+#define free_gatt_pages(table, order)	\
+	free_pages((unsigned long)(table), (order))
+
 #endif