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32 lines
1.0 KiB
32 lines
1.0 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _ASM_X86_AGP_H |
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#define _ASM_X86_AGP_H |
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#include <linux/pgtable.h> |
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#include <asm/cacheflush.h> |
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/* |
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* Functions to keep the agpgart mappings coherent with the MMU. The |
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* GART gives the CPU a physical alias of pages in memory. The alias |
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* region is mapped uncacheable. Make sure there are no conflicting |
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* mappings with different cachability attributes for the same |
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* page. This avoids data corruption on some CPUs. |
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*/ |
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#define map_page_into_agp(page) set_pages_uc(page, 1) |
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#define unmap_page_from_agp(page) set_pages_wb(page, 1) |
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/* |
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* Could use CLFLUSH here if the cpu supports it. But then it would |
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* need to be called for each cacheline of the whole page so it may |
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* not be worth it. Would need a page for it. |
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*/ |
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#define flush_agp_cache() wbinvd() |
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/* GATT allocation. Returns/accepts GATT kernel virtual address. */ |
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#define alloc_gatt_pages(order) \ |
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((char *)__get_free_pages(GFP_KERNEL, (order))) |
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#define free_gatt_pages(table, order) \ |
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free_pages((unsigned long)(table), (order)) |
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#endif /* _ASM_X86_AGP_H */
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