35 lines
1.1 KiB
C
35 lines
1.1 KiB
C
#ifndef AGP_H
|
|
#define AGP_H 1
|
|
|
|
#include <asm/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.
|
|
*/
|
|
|
|
int map_page_into_agp(struct page *page);
|
|
int unmap_page_from_agp(struct page *page);
|
|
#define flush_agp_mappings() global_flush_tlb()
|
|
|
|
/* 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() asm volatile("wbinvd":::"memory")
|
|
|
|
/* Convert a physical address to an address suitable for the GART. */
|
|
#define phys_to_gart(x) (x)
|
|
#define gart_to_phys(x) (x)
|
|
|
|
/* 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
|