[deliverable/linux.git] / include / asm-i386 / agp.h

#ifndef AGP_H
#define AGP_H 1

#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
Commit	Line	Data
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