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/* Convert a physical address to an address suitable for the GART. */ 26#define phys_to_gart(x) (x) 27#define gart_to_phys(x) (x) 28 29/* GATT allocation. Returns/accepts GATT kernel virtual address. */ 30#define alloc_gatt_pages(order) \ 31 ((char *)__get_free_pages(GFP_KERNEL, (order))) 32#define free_gatt_pages(table, order) \ 33 free_pages((unsigned long)(table), (order)) 34 35#endif /* _ASM_X86_AGP_H */ 36