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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 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() /* 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 */