| Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| H. Peter Anvin | 1965aae | 2008-10-22 22:26:29 -0700 | [diff] [blame] | 2 | #ifndef _ASM_X86_AGP_H |
| 3 | #define _ASM_X86_AGP_H |
| Thomas Gleixner | 17d3670 | 2007-10-15 23:28:19 +0200 | [diff] [blame] | 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 | |
| Arjan van de Ven | 6d238cc | 2008-01-30 13:34:06 +0100 | [diff] [blame] | 16 | #define map_page_into_agp(page) set_pages_uc(page, 1) |
| 17 | #define unmap_page_from_agp(page) set_pages_wb(page, 1) |
| Thomas Gleixner | 17d3670 | 2007-10-15 23:28:19 +0200 | [diff] [blame] | 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 | |
| Thomas Gleixner | 17d3670 | 2007-10-15 23:28:19 +0200 | [diff] [blame] | 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 | |
| H. Peter Anvin | 1965aae | 2008-10-22 22:26:29 -0700 | [diff] [blame] | 32 | #endif /* _ASM_X86_AGP_H */ |