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/* 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 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 */
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