text: /*
   * Intel AGPGART routines.
   */
  
  #include <linux/module.h>
  #include <linux/pci.h>
  #include <linux/slab.h>
  #include <linux/init.h>
  #include <linux/kernel.h>
  #include <linux/pagemap.h>
  #include <linux/agp_backend.h>
  #include <asm/smp.h>
  #include "agp.h"
  #include "intel-agp.h"
  #include <drm/intel-gtt.h>
  
  static int intel_fetch_size(void)
  {
  	int i;
  	u16 temp;
  	struct aper_size_info_16 *values;
  
  	pci_read_config_word(agp_bridge->dev, INTEL_APSIZE, &temp);
  	values = A_SIZE_16(agp_bridge->driver->aperture_sizes);
  
  	for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
  		if (temp == values[i].size_value) {
  			agp_bridge->previous_size = agp_bridge->current_size = (void *) (values + i);
  			agp_bridge->aperture_size_idx = i;
  			return values[i].size;
  		}
  	}
  
  	return 0;
  }
  
  static int __intel_8xx_fetch_size(u8 temp)
  {
  	int i;
  	struct aper_size_info_8 *values;
  
  	values = A_SIZE_8(agp_bridge->driver->aperture_sizes);
  
  	for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
  		if (temp == values[i].size_value) {
  			agp_bridge->previous_size =
  				agp_bridge->current_size = (void *) (values + i);
  			agp_bridge->aperture_size_idx = i;
  			return values[i].size;
  		}
  	}
  	return 0;
  }
  
  static int intel_8xx_fetch_size(void)
  {
  	u8 temp;
  
  	pci_read_config_byte(agp_bridge->dev, INTEL_APSIZE, &temp);
  	return __intel_8xx_fetch_size(temp);
  }
  
  static int intel_815_fetch_size(void)
  {
  	u8 temp;
  
  	/* Intel 815 chipsets have a _weird_ APSIZE register with only
  	 * one non-reserved bit, so mask the others out ... */
  	pci_read_config_byte(agp_bridge->dev, INTEL_APSIZE, &temp);
  	temp &= (1 << 3);
  
  	return __intel_8xx_fetch_size(temp);
  }
  
  static void intel_tlbflush(struct agp_memory *mem)
  {
  	pci_write_config_dword(agp_bridge->dev, INTEL_AGPCTRL, 0x2200);
  	pci_write_config_dword(agp_bridge->dev, INTEL_AGPCTRL, 0x2280);
  }
  
  
  static void intel_8xx_tlbflush(struct agp_memory *mem)
  {
  	u32 temp;
  	pci_read_config_dword(agp_bridge->dev, INTEL_AGPCTRL, &temp);
  	pci_write_config_dword(agp_bridge->dev, INTEL_AGPCTRL, temp & ~(1 << 7));
  	pci_read_config_dword(agp_bridge->dev, INTEL_AGPCTRL, &temp);
  	pci_write_config_dword(agp_bridge->dev, INTEL_AGPCTRL, temp | (1 << 7));
  }
  
  
  static void intel_cleanup(void)
  {
  	u16 temp;
  	struct aper_size_info_16 *previous_size;
  
  	previous_size = A_SIZE_16(agp_bridge->previous_size);
  	pci_read_config_word(agp_bridge->dev, INTEL_NBXCFG, &temp);
  	pci_write_config_word(agp_bridge->dev, INTEL_NBXCFG, temp & ~(1 << 9));
  	pci_write_config_word(agp_bridge->dev, INTEL_APSIZE, previous_size->size_value);
  }
  
  
  static void intel_8xx_cleanup(void)
  {
  	u16 temp;
  	struct aper_size_info_8 *previous_size;
  
  	previous_size = A_SIZE_8(agp_bridge->previous_size);
  	pci_read_config_word(agp_bridge->dev, INTEL_NBXCFG, &temp);
  	pci_write_config_word(agp_bridge->dev, INTEL_NBXCFG, temp & ~(1 << 9));
  	pci_write_config_byte(agp_bridge->dev, INTEL_APSIZE, previous_size->size_value);
  }
  
  
  static int intel_configure(void)
  {
  	u16 temp2;
  	struct aper_size_info_16 *current_size;
  
  	current_size = A_SIZE_16(agp_bridge->current_size);
  
  	/* aperture size */
  	pci_write_config_word(agp_bridge->dev, INTEL_APSIZE, current_size->size_value);
  
  	/* address to map to */
  	agp_bridge->gart_bus_addr = pci_bus_address(agp_bridge->dev,
  						    AGP_APERTURE_BAR);
  
  	/* attbase - aperture base */
  	pci_write_config_dword(agp_bridge->dev, INTEL_ATTBASE, agp_bridge->gatt_bus_addr);
  
  	/* agpctrl */
  	pci_write_config_dword(agp_bridge->dev, INTEL_AGPCTRL, 0x2280);
  
  	/* paccfg/nbxcfg */
  	pci_read_config_word(agp_bridge->dev, INTEL_NBXCFG, &temp2);
  	pci_write_config_word(agp_bridge->dev, INTEL_NBXCFG,
  			(temp2 & ~(1 << 10)) | (1 << 9));
  	/* clear any possible error conditions */
  	pci_write_config_byte(agp_bridge->dev, INTEL_ERRSTS + 1, 7);
  	return 0;
  }
  
  static int intel_815_configure(void)
  {
  	u32 addr;
  	u8 temp2;
  	struct aper_size_info_8 *current_size;
  
  	/* attbase - aperture base */
  	/* the Intel 815 chipset spec. says that bits 29-31 in the
  	* ATTBASE register are reserved -> try not to write them */
  	if (agp_bridge->gatt_bus_addr & INTEL_815_ATTBASE_MASK) {
  		dev_emerg(&agp_bridge->dev->dev, "gatt bus addr too high");
  		return -EINVAL;
  	}
  
  	current_size = A_SIZE_8(agp_bridge->current_size);
  
  	/* aperture size */
  	pci_write_config_byte(agp_bridge->dev, INTEL_APSIZE,
  			current_size->size_value);
  
  	/* address to map to */
  	agp_bridge->gart_bus_addr = pci_bus_address(agp_bridge->dev,
  						    AGP_APERTURE_BAR);
  
  	pci_read_config_dword(agp_bridge->dev, INTEL_ATTBASE, &addr);
  	addr &= INTEL_815_ATTBASE_MASK;
  	addr |= agp_bridge->gatt_bus_addr;
  	pci_write_config_dword(agp_bridge->dev, INTEL_ATTBASE, addr);
  
  	/* agpctrl */
  	pci_write_config_dword(agp_bridge->dev, INTEL_AGPCTRL, 0x0000);
  
  	/* apcont */
  	pci_read_config_byte(agp_bridge->dev, INTEL_815_APCONT, &temp2);
  	pci_write_config_byte(agp_bridge->dev, INTEL_815_APCONT, temp2 | (1 << 1));
  
  	/* clear any possible error conditions */
  	/* Oddness : this chipset seems to have no ERRSTS register ! */
  	return 0;
  }
  
  static void intel_820_tlbflush(struct agp_memory *mem)
  {
  	return;
  }
  
  static void intel_820_cleanup(void)
  {
  	u8 temp;
  	struct aper_size_info_8 *previous_size;
  
  	previous_size = A_SIZE_8(agp_bridge->previous_size);
  	pci_read_config_byte(agp_bridge->dev, INTEL_I820_RDCR, &temp);
  	pci_write_config_byte(agp_bridge->dev, INTEL_I820_RDCR,
  			temp & ~(1 << 1));
  	pci_write_config_byte(agp_bridge->dev, INTEL_APSIZE,
  			previous_size->size_value);
  }
  
  
  static int intel_820_configure(void)
  {
  	u8 temp2;
  	struct aper_size_info_8 *current_size;
  
  	current_size = A_SIZE_8(agp_bridge->current_size);
  
  	/* aperture size */
  	pci_write_config_byte(agp_bridge->dev, INTEL_APSIZE, current_size->size_value);
  
  	/* address to map to */
  	agp_bridge->gart_bus_addr = pci_bus_address(agp_bridge->dev,
  						    AGP_APERTURE_BAR);
  
  	/* attbase - aperture base */
  	pci_write_config_dword(agp_bridge->dev, INTEL_ATTBASE, agp_bridge->gatt_bus_addr);
  
  	/* agpctrl */
  	pci_write_config_dword(agp_bridge->dev, INTEL_AGPCTRL, 0x0000);
  
  	/* global enable aperture access */
  	/* This flag is not accessed through MCHCFG register as in */
  	/* i850 chipset. */
  	pci_read_config_byte(agp_bridge->dev, INTEL_I820_RDCR, &temp2);
  	pci_write_config_byte(agp_bridge->dev, INTEL_I820_RDCR, temp2 | (1 << 1));
  	/* clear any possible AGP-related error conditions */
  	pci_write_config_word(agp_bridge->dev, INTEL_I820_ERRSTS, 0x001c);
  	return 0;
  }
  
  static int intel_840_configure(void)
  {
  	u16 temp2;
  	struct aper_size_info_8 *current_size;
  
  	current_size = A_SIZE_8(agp_bridge->current_size);
  
  	/* aperture size */
  	pci_write_config_byte(agp_bridge->dev, INTEL_APSIZE, current_size->size_value);
  
  	/* address to map to */
  	agp_bridge->gart_bus_addr = pci_bus_address(agp_bridge->dev,
  						    AGP_APERTURE_BAR);
  
  	/* attbase - aperture base */
  	pci_write_config_dword(agp_bridge->dev, INTEL_ATTBASE, agp_bridge->gatt_bus_addr);
  
  	/* agpctrl */
  	pci_write_config_dword(agp_bridge->dev, INTEL_AGPCTRL, 0x0000);
  
  	/* mcgcfg */
  	pci_read_config_word(agp_bridge->dev, INTEL_I840_MCHCFG, &temp2);
  	pci_write_config_word(agp_bridge->dev, INTEL_I840_MCHCFG, temp2 | (1 << 9));
  	/* clear any possible error conditions */
  	pci_write_config_word(agp_bridge->dev, INTEL_I840_ERRSTS, 0xc000);
  	return 0;
  }
  
  static int intel_845_configure(void)
  {
  	u8 temp2;
  	struct aper_size_info_8 *current_size;
  
  	current_size = A_SIZE_8(agp_bridge->current_size);
  
  	/* aperture size */
  	pci_write_config_byte(agp_bridge->dev, INTEL_APSIZE, current_size->size_value);
  
  	if (agp_bridge->apbase_config != 0) {
  		pci_write_config_dword(agp_bridge->dev, AGP_APBASE,
  				       agp_bridge->apbase_config);
  	} else {
  		/* address to map to */
  		agp_bridge->gart_bus_addr = pci_bus_address(agp_bridge->dev,
  							    AGP_APERTURE_BAR);
  		agp_bridge->apbase_config = agp_bridge->gart_bus_addr;
  	}
  
  	/* attbase - aperture base */
  	pci_write_config_dword(agp_bridge->dev, INTEL_ATTBASE, agp_bridge->gatt_bus_addr);
  
  	/* agpctrl */
  	pci_write_config_dword(agp_bridge->dev, INTEL_AGPCTRL, 0x0000);
  
  	/* agpm */
  	pci_read_config_byte(agp_bridge->dev, INTEL_I845_AGPM, &temp2);
  	pci_write_config_byte(agp_bridge->dev, INTEL_I845_AGPM, temp2 | (1 << 1));
  	/* clear any possible error conditions */
  	pci_write_config_word(agp_bridge->dev, INTEL_I845_ERRSTS, 0x001c);
  	return 0;
  }
  
  static int intel_850_configure(void)
  {
  	u16 temp2;
  	struct aper_size_info_8 *current_size;
  
  	current_size = A_SIZE_8(agp_bridge->current_size);
  
  	/* aperture size */
  	pci_write_config_byte(agp_bridge->dev, INTEL_APSIZE, current_size->size_value);
  
  	/* address to map to */
  	agp_bridge->gart_bus_addr = pci_bus_address(agp_bridge->dev,
  						    AGP_APERTURE_BAR);
  
  	/* attbase - aperture base */
  	pci_write_config_dword(agp_bridge->dev, INTEL_ATTBASE, agp_bridge->gatt_bus_addr);
  
  	/* agpctrl */
  	pci_write_config_dword(agp_bridge->dev, INTEL_AGPCTRL, 0x0000);
  
  	/* mcgcfg */
  	pci_read_config_word(agp_bridge->dev, INTEL_I850_MCHCFG, &temp2);
  	pci_write_config_word(agp_bridge->dev, INTEL_I850_MCHCFG, temp2 | (1 << 9));
  	/* clear any possible AGP-related error conditions */
  	pci_write_config_word(agp_bridge->dev, INTEL_I850_ERRSTS, 0x001c);
  	return 0;
  }
  
  static int intel_860_configure(void)
  {
  	u16 temp2;
  	struct aper_size_info_8 *current_size;
  
  	current_size = A_SIZE_8(agp_bridge->current_size);
  
  	/* aperture size */
  	pci_write_config_byte(agp_bridge->dev, INTEL_APSIZE, current_size->size_value);
  
  	/* address to map to */
  	agp_bridge->gart_bus_addr = pci_bus_address(agp_bridge->dev,
  						    AGP_APERTURE_BAR);
  
  	/* attbase - aperture base */
  	pci_write_config_dword(agp_bridge->dev, INTEL_ATTBASE, agp_bridge->gatt_bus_addr);
  
  	/* agpctrl */
  	pci_write_config_dword(agp_bridge->dev, INTEL_AGPCTRL, 0x0000);
  
  	/* mcgcfg */
  	pci_read_config_word(agp_bridge->dev, INTEL_I860_MCHCFG, &temp2);
  	pci_write_config_word(agp_bridge->dev, INTEL_I860_MCHCFG, temp2 | (1 << 9));
  	/* clear any possible AGP-related error conditions */
  	pci_write_config_word(agp_bridge->dev, INTEL_I860_ERRSTS, 0xf700);
  	return 0;
  }
  
  static int intel_830mp_configure(void)
  {
  	u16 temp2;
  	struct aper_size_info_8 *current_size;
  
  	current_size = A_SIZE_8(agp_bridge->current_size);
  
  	/* aperture size */
  	pci_write_config_byte(agp_bridge->dev, INTEL_APSIZE, current_size->size_value);
  
  	/* address to map to */
  	agp_bridge->gart_bus_addr = pci_bus_address(agp_bridge->dev,
  						    AGP_APERTURE_BAR);
  
  	/* attbase - aperture base */
  	pci_write_config_dword(agp_bridge->dev, INTEL_ATTBASE, agp_bridge->gatt_bus_addr);
  
  	/* agpctrl */
  	pci_write_config_dword(agp_bridge->dev, INTEL_AGPCTRL, 0x0000);
  
  	/* gmch */
  	pci_read_config_word(agp_bridge->dev, INTEL_NBXCFG, &temp2);
  	pci_write_config_word(agp_bridge->dev, INTEL_NBXCFG, temp2 | (1 << 9));
  	/* clear any possible AGP-related error conditions */
  	pci_write_config_word(agp_bridge->dev, INTEL_I830_ERRSTS, 0x1c);
  	return 0;
  }
  
  static int intel_7505_configure(void)
  {
  	u16 temp2;
  	struct aper_size_info_8 *current_size;
  
  	current_size = A_SIZE_8(agp_bridge->current_size);
  
  	/* aperture size */
  	pci_write_config_byte(agp_bridge->dev, INTEL_APSIZE, current_size->size_value);
  
  	/* address to map to */
  	agp_bridge->gart_bus_addr = pci_bus_address(agp_bridge->dev,
  						    AGP_APERTURE_BAR);
  
  	/* attbase - aperture base */
  	pci_write_config_dword(agp_bridge->dev, INTEL_ATTBASE, agp_bridge->gatt_bus_addr);
  
  	/* agpctrl */
  	pci_write_config_dword(agp_bridge->dev, INTEL_AGPCTRL, 0x0000);
  
  	/* mchcfg */
  	pci_read_config_word(agp_bridge->dev, INTEL_I7505_MCHCFG, &temp2);
  	pci_write_config_word(agp_bridge->dev, INTEL_I7505_MCHCFG, temp2 | (1 << 9));
  
  	return 0;
  }
  
  /* Setup function */
  static const struct gatt_mask intel_generic_masks[] =
  {
  	{.mask = 0x00000017, .type = 0}
  };
  
  static const struct aper_size_info_8 intel_815_sizes[2] =
  {
  	{64, 16384, 4, 0},
  	{32, 8192, 3, 8},
  };
  
  static const struct aper_size_info_8 intel_8xx_sizes[7] =
  {
  	{256, 65536, 6, 0},
  	{128, 32768, 5, 32},
  	{64, 16384, 4, 48},
  	{32, 8192, 3, 56},
  	{16, 4096, 2, 60},
  	{8, 2048, 1, 62},
  	{4, 1024, 0, 63}
  };
  
  static const struct aper_size_info_16 intel_generic_sizes[7] =
  {
  	{256, 65536, 6, 0},
  	{128, 32768, 5, 32},
  	{64, 16384, 4, 48},
  	{32, 8192, 3, 56},
  	{16, 4096, 2, 60},
  	{8, 2048, 1, 62},
  	{4, 1024, 0, 63}
  };
  
  static const struct aper_size_info_8 intel_830mp_sizes[4] =
  {
  	{256, 65536, 6, 0},
  	{128, 32768, 5, 32},
  	{64, 16384, 4, 48},
  	{32, 8192, 3, 56}
  };
  
  static const struct agp_bridge_driver intel_generic_driver = {
  	.owner			= THIS_MODULE,
  	.aperture_sizes		= intel_generic_sizes,
  	.size_type		= U16_APER_SIZE,
  	.num_aperture_sizes	= 7,
  	.needs_scratch_page	= true,
  	.configure		= intel_configure,
  	.fetch_size		= intel_fetch_size,
  	.cleanup		= intel_cleanup,
  	.tlb_flush		= intel_tlbflush,
  	.mask_memory		= agp_generic_mask_memory,
  	.masks			= intel_generic_masks,
  	.agp_enable		= agp_generic_enable,
  	.cache_flush		= global_cache_flush,
  	.create_gatt_table	= agp_generic_create_gatt_table,
  	.free_gatt_table	= agp_generic_free_gatt_table,
  	.insert_memory		= agp_generic_insert_memory,
  	.remove_memory		= agp_generic_remove_memory,
  	.alloc_by_type		= agp_generic_alloc_by_type,
  	.free_by_type		= agp_generic_free_by_type,
  	.agp_alloc_page		= agp_generic_alloc_page,
  	.agp_alloc_pages        = agp_generic_alloc_pages,
  	.agp_destroy_page	= agp_generic_destroy_page,
  	.agp_destroy_pages      = agp_generic_destroy_pages,
  	.agp_type_to_mask_type  = agp_generic_type_to_mask_type,
  };
  
  static const struct agp_bridge_driver intel_815_driver = {
  	.owner			= THIS_MODULE,
  	.aperture_sizes		= intel_815_sizes,
  	.size_type		= U8_APER_SIZE,
  	.num_aperture_sizes	= 2,
  	.needs_scratch_page	= true,
  	.configure		= intel_815_configure,
  	.fetch_size		= intel_815_fetch_size,
  	.cleanup		= intel_8xx_cleanup,
  	.tlb_flush		= intel_8xx_tlbflush,
  	.mask_memory		= agp_generic_mask_memory,
  	.masks			= intel_generic_masks,
  	.agp_enable		= agp_generic_enable,
  	.cache_flush		= global_cache_flush,
  	.create_gatt_table	= agp_generic_create_gatt_table,
  	.free_gatt_table	= agp_generic_free_gatt_table,
  	.insert_memory		= agp_generic_insert_memory,
  	.remove_memory		= agp_generic_remove_memory,
  	.alloc_by_type		= agp_generic_alloc_by_type,
  	.free_by_type		= agp_generic_free_by_type,
  	.agp_alloc_page		= agp_generic_alloc_page,
  	.agp_alloc_pages        = agp_generic_alloc_pages,
  	.agp_destroy_page	= agp_generic_destroy_page,
  	.agp_destroy_pages      = agp_generic_destroy_pages,
  	.agp_type_to_mask_type	= agp_generic_type_to_mask_type,
  };
  
  static const struct agp_bridge_driver intel_820_driver = {
  	.owner			= THIS_MODULE,
  	.aperture_sizes		= intel_8xx_sizes,
  	.size_type		= U8_APER_SIZE,
  	.num_aperture_sizes	= 7,
  	.needs_scratch_page	= true,
  	.configure		= intel_820_configure,
  	.fetch_size		= intel_8xx_fetch_size,
  	.cleanup		= intel_820_cleanup,
  	.tlb_flush		= intel_820_tlbflush,
  	.mask_memory		= agp_generic_mask_memory,
  	.masks			= intel_generic_masks,
  	.agp_enable		= agp_generic_enable,
  	.cache_flush		= global_cache_flush,
  	.create_gatt_table	= agp_generic_create_gatt_table,
  	.free_gatt_table	= agp_generic_free_gatt_table,
  	.insert_memory		= agp_generic_insert_memory,
  	.remove_memory		= agp_generic_remove_memory,
  	.alloc_by_type		= agp_generic_alloc_by_type,
  	.free_by_type		= agp_generic_free_by_type,
  	.agp_alloc_page		= agp_generic_alloc_page,
  	.agp_alloc_pages        = agp_generic_alloc_pages,
  	.agp_destroy_page	= agp_generic_destroy_page,
  	.agp_destroy_pages      = agp_generic_destroy_pages,
  	.agp_type_to_mask_type  = agp_generic_type_to_mask_type,
  };
  
  static const struct agp_bridge_driver intel_830mp_driver = {
  	.owner			= THIS_MODULE,
  	.aperture_sizes		= intel_830mp_sizes,
  	.size_type		= U8_APER_SIZE,
  	.num_aperture_sizes	= 4,
  	.needs_scratch_page	= true,
  	.configure		= intel_830mp_configure,
  	.fetch_size		= intel_8xx_fetch_size,
  	.cleanup		= intel_8xx_cleanup,
  	.tlb_flush		= intel_8xx_tlbflush,
  	.mask_memory		= agp_generic_mask_memory,
  	.masks			= intel_generic_masks,
  	.agp_enable		= agp_generic_enable,
  	.cache_flush		= global_cache_flush,
  	.create_gatt_table	= agp_generic_create_gatt_table,
  	.free_gatt_table	= agp_generic_free_gatt_table,
  	.insert_memory		= agp_generic_insert_memory,
  	.remove_memory		= agp_generic_remove_memory,
  	.alloc_by_type		= agp_generic_alloc_by_type,
  	.free_by_type		= agp_generic_free_by_type,
  	.agp_alloc_page		= agp_generic_alloc_page,
  	.agp_alloc_pages        = agp_generic_alloc_pages,
  	.agp_destroy_page	= agp_generic_destroy_page,
  	.agp_destroy_pages      = agp_generic_destroy_pages,
  	.agp_type_to_mask_type  = agp_generic_type_to_mask_type,
  };
  
  static const struct agp_bridge_driver intel_840_driver = {
  	.owner			= THIS_MODULE,
  	.aperture_sizes		= intel_8xx_sizes,
  	.size_type		= U8_APER_SIZE,
  	.num_aperture_sizes	= 7,
  	.needs_scratch_page	= true,
  	.configure		= intel_840_configure,
  	.fetch_size		= intel_8xx_fetch_size,
  	.cleanup		= intel_8xx_cleanup,
  	.tlb_flush		= intel_8xx_tlbflush,
  	.mask_memory		= agp_generic_mask_memory,
  	.masks			= intel_generic_masks,
  	.agp_enable		= agp_generic_enable,
  	.cache_flush		= global_cache_flush,
  	.create_gatt_table	= agp_generic_create_gatt_table,
  	.free_gatt_table	= agp_generic_free_gatt_table,
  	.insert_memory		= agp_generic_insert_memory,
  	.remove_memory		= agp_generic_remove_memory,
  	.alloc_by_type		= agp_generic_alloc_by_type,
  	.free_by_type		= agp_generic_free_by_type,
  	.agp_alloc_page		= agp_generic_alloc_page,
  	.agp_alloc_pages        = agp_generic_alloc_pages,
  	.agp_destroy_page	= agp_generic_destroy_page,
  	.agp_destroy_pages      = agp_generic_destroy_pages,
  	.agp_type_to_mask_type  = agp_generic_type_to_mask_type,
  };
  
  static const struct agp_bridge_driver intel_845_driver = {
  	.owner			= THIS_MODULE,
  	.aperture_sizes		= intel_8xx_sizes,
  	.size_type		= U8_APER_SIZE,
  	.num_aperture_sizes	= 7,
  	.needs_scratch_page	= true,
  	.configure		= intel_845_configure,
  	.fetch_size		= intel_8xx_fetch_size,
  	.cleanup		= intel_8xx_cleanup,
  	.tlb_flush		= intel_8xx_tlbflush,
  	.mask_memory		= agp_generic_mask_memory,
  	.masks			= intel_generic_masks,
  	.agp_enable		= agp_generic_enable,
  	.cache_flush		= global_cache_flush,
  	.create_gatt_table	= agp_generic_create_gatt_table,
  	.free_gatt_table	= agp_generic_free_gatt_table,
  	.insert_memory		= agp_generic_insert_memory,
  	.remove_memory		= agp_generic_remove_memory,
  	.alloc_by_type		= agp_generic_alloc_by_type,
  	.free_by_type		= agp_generic_free_by_type,
  	.agp_alloc_page		= agp_generic_alloc_page,
  	.agp_alloc_pages        = agp_generic_alloc_pages,
  	.agp_destroy_page	= agp_generic_destroy_page,
  	.agp_destroy_pages      = agp_generic_destroy_pages,
  	.agp_type_to_mask_type  = agp_generic_type_to_mask_type,
  };
  
  static const struct agp_bridge_driver intel_850_driver = {
  	.owner			= THIS_MODULE,
  	.aperture_sizes		= intel_8xx_sizes,
  	.size_type		= U8_APER_SIZE,
  	.num_aperture_sizes	= 7,
  	.needs_scratch_page	= true,
  	.configure		= intel_850_configure,
  	.fetch_size		= intel_8xx_fetch_size,
  	.cleanup		= intel_8xx_cleanup,
  	.tlb_flush		= intel_8xx_tlbflush,
  	.mask_memory		= agp_generic_mask_memory,
  	.masks			= intel_generic_masks,
  	.agp_enable		= agp_generic_enable,
  	.cache_flush		= global_cache_flush,
  	.create_gatt_table	= agp_generic_create_gatt_table,
  	.free_gatt_table	= agp_generic_free_gatt_table,
  	.insert_memory		= agp_generic_insert_memory,
  	.remove_memory		= agp_generic_remove_memory,
  	.alloc_by_type		= agp_generic_alloc_by_type,
  	.free_by_type		= agp_generic_free_by_type,
  	.agp_alloc_page		= agp_generic_alloc_page,
  	.agp_alloc_pages        = agp_generic_alloc_pages,
  	.agp_destroy_page	= agp_generic_destroy_page,
  	.agp_destroy_pages      = agp_generic_destroy_pages,
  	.agp_type_to_mask_type  = agp_generic_type_to_mask_type,
  };
  
  static const struct agp_bridge_driver intel_860_driver = {
  	.owner			= THIS_MODULE,
  	.aperture_sizes		= intel_8xx_sizes,
  	.size_type		= U8_APER_SIZE,
  	.num_aperture_sizes	= 7,
  	.needs_scratch_page	= true,
  	.configure		= intel_860_configure,
  	.fetch_size		= intel_8xx_fetch_size,
  	.cleanup		= intel_8xx_cleanup,
  	.tlb_flush		= intel_8xx_tlbflush,
  	.mask_memory		= agp_generic_mask_memory,
  	.masks			= intel_generic_masks,
  	.agp_enable		= agp_generic_enable,
  	.cache_flush		= global_cache_flush,
  	.create_gatt_table	= agp_generic_create_gatt_table,
  	.free_gatt_table	= agp_generic_free_gatt_table,
  	.insert_memory		= agp_generic_insert_memory,
  	.remove_memory		= agp_generic_remove_memory,
  	.alloc_by_type		= agp_generic_alloc_by_type,
  	.free_by_type		= agp_generic_free_by_type,
  	.agp_alloc_page		= agp_generic_alloc_page,
  	.agp_alloc_pages        = agp_generic_alloc_pages,
  	.agp_destroy_page	= agp_generic_destroy_page,
  	.agp_destroy_pages      = agp_generic_destroy_pages,
  	.agp_type_to_mask_type  = agp_generic_type_to_mask_type,
  };
  
  static const struct agp_bridge_driver intel_7505_driver = {
  	.owner			= THIS_MODULE,
  	.aperture_sizes		= intel_8xx_sizes,
  	.size_type		= U8_APER_SIZE,
  	.num_aperture_sizes	= 7,
  	.needs_scratch_page	= true,
  	.configure		= intel_7505_configure,
  	.fetch_size		= intel_8xx_fetch_size,
  	.cleanup		= intel_8xx_cleanup,
  	.tlb_flush		= intel_8xx_tlbflush,
  	.mask_memory		= agp_generic_mask_memory,
  	.masks			= intel_generic_masks,
  	.agp_enable		= agp_generic_enable,
  	.cache_flush		= global_cache_flush,
  	.create_gatt_table	= agp_generic_create_gatt_table,
  	.free_gatt_table	= agp_generic_free_gatt_table,
  	.insert_memory		= agp_generic_insert_memory,
  	.remove_memory		= agp_generic_remove_memory,
  	.alloc_by_type		= agp_generic_alloc_by_type,
  	.free_by_type		= agp_generic_free_by_type,
  	.agp_alloc_page		= agp_generic_alloc_page,
  	.agp_alloc_pages        = agp_generic_alloc_pages,
  	.agp_destroy_page	= agp_generic_destroy_page,
  	.agp_destroy_pages      = agp_generic_destroy_pages,
  	.agp_type_to_mask_type  = agp_generic_type_to_mask_type,
  };
  
  /* Table to describe Intel GMCH and AGP/PCIE GART drivers.  At least one of
   * driver and gmch_driver must be non-null, and find_gmch will determine
   * which one should be used if a gmch_chip_id is present.
   */
  static const struct intel_agp_driver_description {
  	unsigned int chip_id;
  	char *name;
  	const struct agp_bridge_driver *driver;
  } intel_agp_chipsets[] = {
  	{ PCI_DEVICE_ID_INTEL_82443LX_0, "440LX", &intel_generic_driver },
  	{ PCI_DEVICE_ID_INTEL_82443BX_0, "440BX", &intel_generic_driver },
  	{ PCI_DEVICE_ID_INTEL_82443GX_0, "440GX", &intel_generic_driver },
  	{ PCI_DEVICE_ID_INTEL_82815_MC, "i815", &intel_815_driver },
  	{ PCI_DEVICE_ID_INTEL_82820_HB, "i820", &intel_820_driver },
  	{ PCI_DEVICE_ID_INTEL_82820_UP_HB, "i820", &intel_820_driver },
  	{ PCI_DEVICE_ID_INTEL_82830_HB, "830M", &intel_830mp_driver },
  	{ PCI_DEVICE_ID_INTEL_82840_HB, "i840", &intel_840_driver },
  	{ PCI_DEVICE_ID_INTEL_82845_HB, "i845", &intel_845_driver },
  	{ PCI_DEVICE_ID_INTEL_82845G_HB, "845G", &intel_845_driver },
  	{ PCI_DEVICE_ID_INTEL_82850_HB, "i850", &intel_850_driver },
  	{ PCI_DEVICE_ID_INTEL_82854_HB, "854", &intel_845_driver },
  	{ PCI_DEVICE_ID_INTEL_82855PM_HB, "855PM", &intel_845_driver },
  	{ PCI_DEVICE_ID_INTEL_82855GM_HB, "855GM", &intel_845_driver },
  	{ PCI_DEVICE_ID_INTEL_82860_HB, "i860", &intel_860_driver },
  	{ PCI_DEVICE_ID_INTEL_82865_HB, "865", &intel_845_driver },
  	{ PCI_DEVICE_ID_INTEL_82875_HB, "i875", &intel_845_driver },
  	{ PCI_DEVICE_ID_INTEL_7505_0, "E7505", &intel_7505_driver },
  	{ PCI_DEVICE_ID_INTEL_7205_0, "E7205", &intel_7505_driver },
  	{ 0, NULL, NULL }
  };
  
  static int agp_intel_probe(struct pci_dev *pdev,
  			   const struct pci_device_id *ent)
  {
  	struct agp_bridge_data *bridge;
  	u8 cap_ptr = 0;
  	struct resource *r;
  	int i, err;
  
  	cap_ptr = pci_find_capability(pdev, PCI_CAP_ID_AGP);
  
  	bridge = agp_alloc_bridge();
  	if (!bridge)
  		return -ENOMEM;
  
  	bridge->capndx = cap_ptr;
  
  	if (intel_gmch_probe(pdev, NULL, bridge))
  		goto found_gmch;
  
  	for (i = 0; intel_agp_chipsets[i].name != NULL; i++) {
  		/* In case that multiple models of gfx chip may
  		   stand on same host bridge type, this can be
  		   sure we detect the right IGD. */
  		if (pdev->device == intel_agp_chipsets[i].chip_id) {
  			bridge->driver = intel_agp_chipsets[i].driver;
  			break;
  		}
  	}
  
  	if (!bridge->driver) {
  		if (cap_ptr)
  			dev_warn(&pdev->dev, "unsupported Intel chipset [%04x/%04x]\n",
  				 pdev->vendor, pdev->device);
  		agp_put_bridge(bridge);
  		return -ENODEV;
  	}
  
  	bridge->dev = pdev;
  	bridge->dev_private_data = NULL;
  
  	dev_info(&pdev->dev, "Intel %s Chipset\n", intel_agp_chipsets[i].name);
  
  	/*
  	* The following fixes the case where the BIOS has "forgotten" to
  	* provide an address range for the GART.
  	* 20030610 - hamish@zot.org
  	* This happens before pci_enable_device() intentionally;
  	* calling pci_enable_device() before assigning the resource
  	* will result in the GART being disabled on machines with such
  	* BIOSs (the GART ends up with a BAR starting at 0, which
  	* conflicts a lot of other devices).
  	*/
  	r = &pdev->resource[0];
  	if (!r->start && r->end) {
  		if (pci_assign_resource(pdev, 0)) {
  			dev_err(&pdev->dev, "can't assign resource 0\n");
  			agp_put_bridge(bridge);
  			return -ENODEV;
  		}
  	}
  
  	/*
  	* If the device has not been properly setup, the following will catch
  	* the problem and should stop the system from crashing.
  	* 20030610 - hamish@zot.org
  	*/
  	if (pci_enable_device(pdev)) {
  		dev_err(&pdev->dev, "can't enable PCI device\n");
  		agp_put_bridge(bridge);
  		return -ENODEV;
  	}
  
  	/* Fill in the mode register */
  	if (cap_ptr) {
  		pci_read_config_dword(pdev,
  				bridge->capndx+PCI_AGP_STATUS,
  				&bridge->mode);
  	}
  
  found_gmch:
  	pci_set_drvdata(pdev, bridge);
  	err = agp_add_bridge(bridge);
  	return err;
  }
  
  static void agp_intel_remove(struct pci_dev *pdev)
  {
  	struct agp_bridge_data *bridge = pci_get_drvdata(pdev);
  
  	agp_remove_bridge(bridge);
  
  	intel_gmch_remove();
  
  	agp_put_bridge(bridge);
  }
  
  #ifdef CONFIG_PM
  static int agp_intel_resume(struct pci_dev *pdev)
  {
  	struct agp_bridge_data *bridge = pci_get_drvdata(pdev);
  
  	bridge->driver->configure();
  
  	return 0;
  }
  #endif
  
  static struct pci_device_id agp_intel_pci_table[] = {
  #define ID(x)						\
  	{						\
  	.class		= (PCI_CLASS_BRIDGE_HOST << 8),	\
  	.class_mask	= ~0,				\
  	.vendor		= PCI_VENDOR_ID_INTEL,		\
  	.device		= x,				\
  	.subvendor	= PCI_ANY_ID,			\
  	.subdevice	= PCI_ANY_ID,			\
  	}
  	ID(PCI_DEVICE_ID_INTEL_82441), /* for HAS2 support */
  	ID(PCI_DEVICE_ID_INTEL_82443LX_0),
  	ID(PCI_DEVICE_ID_INTEL_82443BX_0),
  	ID(PCI_DEVICE_ID_INTEL_82443GX_0),
  	ID(PCI_DEVICE_ID_INTEL_82810_MC1),
  	ID(PCI_DEVICE_ID_INTEL_82810_MC3),
  	ID(PCI_DEVICE_ID_INTEL_82810E_MC),
  	ID(PCI_DEVICE_ID_INTEL_82815_MC),
  	ID(PCI_DEVICE_ID_INTEL_82820_HB),
  	ID(PCI_DEVICE_ID_INTEL_82820_UP_HB),
  	ID(PCI_DEVICE_ID_INTEL_82830_HB),
  	ID(PCI_DEVICE_ID_INTEL_82840_HB),
  	ID(PCI_DEVICE_ID_INTEL_82845_HB),
  	ID(PCI_DEVICE_ID_INTEL_82845G_HB),
  	ID(PCI_DEVICE_ID_INTEL_82850_HB),
  	ID(PCI_DEVICE_ID_INTEL_82854_HB),
  	ID(PCI_DEVICE_ID_INTEL_82855PM_HB),
  	ID(PCI_DEVICE_ID_INTEL_82855GM_HB),
  	ID(PCI_DEVICE_ID_INTEL_82860_HB),
  	ID(PCI_DEVICE_ID_INTEL_82865_HB),
  	ID(PCI_DEVICE_ID_INTEL_82875_HB),
  	ID(PCI_DEVICE_ID_INTEL_7505_0),
  	ID(PCI_DEVICE_ID_INTEL_7205_0),
  	ID(PCI_DEVICE_ID_INTEL_E7221_HB),
  	ID(PCI_DEVICE_ID_INTEL_82915G_HB),
  	ID(PCI_DEVICE_ID_INTEL_82915GM_HB),
  	ID(PCI_DEVICE_ID_INTEL_82945G_HB),
  	ID(PCI_DEVICE_ID_INTEL_82945GM_HB),
  	ID(PCI_DEVICE_ID_INTEL_82945GME_HB),
  	ID(PCI_DEVICE_ID_INTEL_PINEVIEW_M_HB),
  	ID(PCI_DEVICE_ID_INTEL_PINEVIEW_HB),
  	ID(PCI_DEVICE_ID_INTEL_82946GZ_HB),
  	ID(PCI_DEVICE_ID_INTEL_82G35_HB),
  	ID(PCI_DEVICE_ID_INTEL_82965Q_HB),
  	ID(PCI_DEVICE_ID_INTEL_82965G_HB),
  	ID(PCI_DEVICE_ID_INTEL_82965GM_HB),
  	ID(PCI_DEVICE_ID_INTEL_82965GME_HB),
  	ID(PCI_DEVICE_ID_INTEL_G33_HB),
  	ID(PCI_DEVICE_ID_INTEL_Q35_HB),
  	ID(PCI_DEVICE_ID_INTEL_Q33_HB),
  	ID(PCI_DEVICE_ID_INTEL_GM45_HB),
  	ID(PCI_DEVICE_ID_INTEL_EAGLELAKE_HB),
  	ID(PCI_DEVICE_ID_INTEL_Q45_HB),
  	ID(PCI_DEVICE_ID_INTEL_G45_HB),
  	ID(PCI_DEVICE_ID_INTEL_G41_HB),
  	ID(PCI_DEVICE_ID_INTEL_B43_HB),
  	ID(PCI_DEVICE_ID_INTEL_B43_1_HB),
  	ID(PCI_DEVICE_ID_INTEL_IRONLAKE_D_HB),
  	ID(PCI_DEVICE_ID_INTEL_IRONLAKE_D2_HB),
  	ID(PCI_DEVICE_ID_INTEL_IRONLAKE_M_HB),
  	ID(PCI_DEVICE_ID_INTEL_IRONLAKE_MA_HB),
  	ID(PCI_DEVICE_ID_INTEL_IRONLAKE_MC2_HB),
  	{ }
  };
  
  MODULE_DEVICE_TABLE(pci, agp_intel_pci_table);
  
  static struct pci_driver agp_intel_pci_driver = {
  	.name		= "agpgart-intel",
  	.id_table	= agp_intel_pci_table,
  	.probe		= agp_intel_probe,
  	.remove		= agp_intel_remove,
  #ifdef CONFIG_PM
  	.resume		= agp_intel_resume,
  #endif
  };
  
  static int __init agp_intel_init(void)
  {
  	if (agp_off)
  		return -EINVAL;
  	return pci_register_driver(&agp_intel_pci_driver);
  }
  
  static void __exit agp_intel_cleanup(void)
  {
  	pci_unregister_driver(&agp_intel_pci_driver);
  }
  
  module_init(agp_intel_init);
  module_exit(agp_intel_cleanup);
  
  MODULE_AUTHOR("Dave Jones, Various @Intel");
  MODULE_LICENSE("GPL and additional rights");
  