FreeBSD/Linux Kernel Cross Reference
sys/dev/agp/agpvar.h

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2000 Doug Rabson
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      $FreeBSD$
     */
    
    #ifndef _PCI_AGPVAR_H_
    #define _PCI_AGPVAR_H_
    
    /*
     * The AGP chipset can be acquired by user or kernel code. If the
     * chipset has already been acquired, it cannot be acquired by another 
     * user until the previous user has released it.
     */
    enum agp_acquire_state {
            AGP_ACQUIRE_FREE,
            AGP_ACQUIRE_USER,
            AGP_ACQUIRE_KERNEL
    };
    
    /*
     * This structure is used to query the state of the AGP system.
     */
    struct agp_info {
            u_int32_t       ai_mode;
            vm_offset_t     ai_aperture_base;
            vm_size_t       ai_aperture_size;
            vm_size_t       ai_memory_allowed;
            vm_size_t       ai_memory_used;
            u_int32_t       ai_devid;
    };
    
    struct agp_memory_info {
            vm_size_t       ami_size;       /* size in bytes */
            vm_offset_t     ami_physical;   /* bogus hack for i810 */
            vm_offset_t     ami_offset;     /* page offset if bound */
            int             ami_is_bound;   /* non-zero if bound */
    };
    
    /*
     * Find the AGP device and return it.
     */
    device_t agp_find_device(void);
    
    /*
     * Return the current owner of the AGP chipset.
     */
    enum agp_acquire_state agp_state(device_t dev);
    
    /*
     * Query the state of the AGP system.
     */
    void agp_get_info(device_t dev, struct agp_info *info);
    
    /*
     * Acquire the AGP chipset for use by the kernel. Returns EBUSY if the
     * AGP chipset is already acquired by another user. 
     */
    int agp_acquire(device_t dev);
    
    /*
     * Release the AGP chipset.
     */
    int agp_release(device_t dev);
    
    /*
     * Enable the agp hardware with the relavent mode. The mode bits are
     * defined in <dev/agp/agpreg.h>
     */
    int agp_enable(device_t dev, u_int32_t mode);
    
    /*
     * Allocate physical memory suitable for mapping into the AGP
     * aperture.  The value returned is an opaque handle which can be
     * passed to agp_bind(), agp_unbind() or agp_deallocate().
    */
   void *agp_alloc_memory(device_t dev, int type, vm_size_t bytes);
   
   /*
    * Free memory which was allocated with agp_allocate().
    */
   void agp_free_memory(device_t dev, void *handle);
   
   /*
    * Bind memory allocated with agp_allocate() at a given offset within
    * the AGP aperture. Returns EINVAL if the memory is already bound or
    * the offset is not at an AGP page boundary.
    */
   int agp_bind_memory(device_t dev, void *handle, vm_offset_t offset);
   
   /*
    * Unbind memory from the AGP aperture. Returns EINVAL if the memory
    * is not bound.
    */
   int agp_unbind_memory(device_t dev, void *handle);
   
   /*
    * Retrieve information about a memory block allocated with
    * agp_alloc_memory().
    */
   void agp_memory_info(device_t dev, void *handle, struct agp_memory_info *mi);
   
   /*
    * Bind a set of pages at a given offset within the AGP aperture.
    * Returns EINVAL if the given size or offset is not at an AGP page boundary.
    */
   int agp_bind_pages(device_t dev, vm_page_t *pages, vm_size_t size,
                      vm_offset_t offset);
   
   /*
    * Unbind a set of pages from the AGP aperture.
    * Returns EINVAL if the given size or offset is not at an AGP page boundary.
    */
   int agp_unbind_pages(device_t dev, vm_size_t size, vm_offset_t offset);
   
   #define AGP_NORMAL_MEMORY 0
   
   #define AGP_USER_TYPES (1 << 16)
   #define AGP_USER_MEMORY (AGP_USER_TYPES)
   #define AGP_USER_CACHED_MEMORY (AGP_USER_TYPES + 1)
   
   #endif /* !_PCI_AGPVAR_H_ */

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