27 lines
835 B
C
27 lines
835 B
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _ASM_X86_AGP_H
|
|
#define _ASM_X86_AGP_H
|
|
|
|
#include <linux/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 cacheability 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()
|
|
|
|
#endif /* _ASM_X86_AGP_H */
|