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  1. #ifndef _ASM_X86_AGP_H
  2. #define _ASM_X86_AGP_H
  3.  
  4. #include <asm/pgtable.h>
  5. #include <asm/cacheflush.h>
  6.  
  7. /*
  8.  * Functions to keep the agpgart mappings coherent with the MMU. The
  9.  * GART gives the CPU a physical alias of pages in memory. The alias
  10.  * region is mapped uncacheable. Make sure there are no conflicting
  11.  * mappings with different cachability attributes for the same
  12.  * page. This avoids data corruption on some CPUs.
  13.  */
  14.  
  15. #define map_page_into_agp(page) set_pages_uc(page, 1)
  16. #define unmap_page_from_agp(page) set_pages_wb(page, 1)
  17.  
  18. /*
  19.  * Could use CLFLUSH here if the cpu supports it. But then it would
  20.  * need to be called for each cacheline of the whole page so it may
  21.  * not be worth it. Would need a page for it.
  22.  */
  23. #define flush_agp_cache() wbinvd()
  24.  
  25. /* GATT allocation. Returns/accepts GATT kernel virtual address. */
  26. #define alloc_gatt_pages(order)         \
  27.         ((char *)__get_free_pages(GFP_KERNEL, (order)))
  28. #define free_gatt_pages(table, order)   \
  29.         free_pages((unsigned long)(table), (order))
  30.  
  31. #endif /* _ASM_X86_AGP_H */
  32.