| #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 |
