include/asm-x86/agp_32.h

   1 #ifndef AGP_H
   2 #define AGP_H 1
   3
   4 #include <asm/pgtable.h>
   5 #include <asm/cacheflush.h>
   6
   7 /*
   8  * Functions to keep the agpgart mappings coherent with the MMU.
   9  * The GART gives the CPU a physical alias of pages in memory. The alias region is
  10  * mapped uncacheable. Make sure there are no conflicting mappings
  11  * with different cachability attributes for the same page. This avoids
  12  * data corruption on some CPUs.
  13  */
  14
  15 /* Caller's responsibility to call global_flush_tlb() for
  16  * performance reasons */
  17 #define map_page_into_agp(page) change_page_attr(page, 1, PAGE_KERNEL_NOCACHE)
  18 #define unmap_page_from_agp(page) change_page_attr(page, 1, PAGE_KERNEL)
  19 #define flush_agp_mappings() global_flush_tlb()
  20
  21 /* Could use CLFLUSH here if the cpu supports it. But then it would
  22    need to be called for each cacheline of the whole page so it may not be
  23    worth it. Would need a page for it. */
  24 #define flush_agp_cache() wbinvd()
  25
  26 /* Convert a physical address to an address suitable for the GART. */
  27 #define phys_to_gart(x) (x)
  28 #define gart_to_phys(x) (x)
  29
  30 /* GATT allocation. Returns/accepts GATT kernel virtual address. */
  31 #define alloc_gatt_pages(order)         \
  32         ((char *)__get_free_pages(GFP_KERNEL, (order)))
  33 #define free_gatt_pages(table, order)   \
  34         free_pages((unsigned long)(table), (order))
  35
  36 #endif