1. 根目录:
2. include
3. drm
4. intel-gtt.h

/* Common header for intel-gtt.ko and i915.ko */

#ifndef _DRM_INTEL_GTT_H
#define	_DRM_INTEL_GTT_H

void intel_gtt_get(size_t *gtt_total, size_t *stolen_size,
		   phys_addr_t *mappable_base, unsigned long *mappable_end);

int intel_gmch_probe(struct pci_dev *bridge_pdev, struct pci_dev *gpu_pdev,
		     struct agp_bridge_data *bridge);
void intel_gmch_remove(void);

bool intel_enable_gtt(void);

void intel_gtt_chipset_flush(void);
void intel_gtt_insert_sg_entries(struct sg_table *st,
				 unsigned int pg_start,
				 unsigned int flags);
void intel_gtt_clear_range(unsigned int first_entry, unsigned int num_entries);

/* Special gtt memory types */
#define AGP_DCACHE_MEMORY	1
#define AGP_PHYS_MEMORY		2

/* flag for GFDT type */
#define AGP_USER_CACHED_MEMORY_GFDT (1 << 3)

#ifdef CONFIG_INTEL_IOMMU
extern int intel_iommu_gfx_mapped;
#endif

#endif