[mirror_ubuntu-disco-kernel.git] / arch / x86 / include / asm / agp.h

/* SPDX-License-Identifier: GPL-2.0 */
#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.
 */

#define map_page_into_agp(page) set_pages_uc(page, 1)
#define unmap_page_from_agp(page) set_pages_wb(page, 1)

/*
 * 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()

/* 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 /* _ASM_X86_AGP_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
1965aae3 PA	2	#ifndef _ASM_X86_AGP_H
1965aae3 PA	3	#define _ASM_X86_AGP_H
17d36707 TG	4
	5	#include <asm/pgtable.h>
	6	#include <asm/cacheflush.h>
	7
	8	/*
	9	* Functions to keep the agpgart mappings coherent with the MMU. The
	10	* GART gives the CPU a physical alias of pages in memory. The alias
	11	* region is mapped uncacheable. Make sure there are no conflicting
	12	* mappings with different cachability attributes for the same
	13	* page. This avoids data corruption on some CPUs.
	14	*/
	15
6d238cc4 AV	16	#define map_page_into_agp(page) set_pages_uc(page, 1)
6d238cc4 AV	17	#define unmap_page_from_agp(page) set_pages_wb(page, 1)
17d36707 TG	18
	19	/*
	20	* Could use CLFLUSH here if the cpu supports it. But then it would
	21	* need to be called for each cacheline of the whole page so it may
	22	* not be worth it. Would need a page for it.
	23	*/
	24	#define flush_agp_cache() wbinvd()
	25
17d36707 TG	26	/* GATT allocation. Returns/accepts GATT kernel virtual address. */
	27	#define alloc_gatt_pages(order) \
	28	((char *)__get_free_pages(GFP_KERNEL, (order)))
	29	#define free_gatt_pages(table, order) \
	30	free_pages((unsigned long)(table), (order))
	31
1965aae3	32	#endif /* _ASM_X86_AGP_H */