| /* 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 */ |
