Commit | Line | Data |
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1da177e4 LT |
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 | ||
9eeee244 JB |
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) | |
1da177e4 LT |
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. */ | |
4bb0d3ec | 24 | #define flush_agp_cache() wbinvd() |
1da177e4 | 25 | |
07eee78e KF |
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 | ||
1da177e4 | 36 | #endif |