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- #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
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