This causes data corruption and/or crashes when AGP is actually used.
Signed-off-by: Jan Beulich <jbeulich@novell.com>
Index: head-2006-11-21/include/asm-x86_64/mach-xen/asm/agp.h
==================================================================--- /dev/null
1970-01-01 00:00:00.000000000 +0000
+++ head-2006-11-21/include/asm-x86_64/mach-xen/asm/agp.h 2006-11-30
15:23:48.000000000 +0100
@@ -0,0 +1,35 @@
+#ifndef AGP_H
+#define AGP_H 1
+
+#include <asm/cacheflush.h>
+#include <asm/system.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() wbinvd()
+
+/* Convert a physical address to an address suitable for the GART. */
+#define phys_to_gart(x) phys_to_machine(x)
+#define gart_to_phys(x) machine_to_phys(x)
+
+/* GATT allocation. Returns/accepts GATT kernel virtual address. */
+#define alloc_gatt_pages(order) ({ \
+ char *_t; dma_addr_t _d; \
+ _t = dma_alloc_coherent(NULL,PAGE_SIZE<<(order),&_d,GFP_KERNEL);
\
+ _t; })
+#define free_gatt_pages(table, order) \
+ dma_free_coherent(NULL,PAGE_SIZE<<(order),(table),virt_to_bus(table))
+
+#endif
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