The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/dev/agp/agp_if.m

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    1 #
    2 # Copyright (c) 2000 Doug Rabson
    3 # All rights reserved.
    4 #
    5 # Redistribution and use in source and binary forms, with or without
    6 # modification, are permitted provided that the following conditions
    7 # are met:
    8 # 1. Redistributions of source code must retain the above copyright
    9 #    notice, this list of conditions and the following disclaimer.
   10 # 2. Redistributions in binary form must reproduce the above copyright
   11 #    notice, this list of conditions and the following disclaimer in the
   12 #    documentation and/or other materials provided with the distribution.
   13 #
   14 # THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15 # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17 # ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18 # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19 # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20 # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21 # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22 # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23 # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24 # SUCH DAMAGE.
   25 #
   26 # $FreeBSD: src/sys/dev/agp/agp_if.m,v 1.4 2007/11/12 21:51:36 jhb Exp $
   27 # $DragonFly: src/sys/dev/agp/agp_if.m,v 1.4 2008/01/07 01:34:58 corecode Exp $
   28 #
   29 
   30 #include <sys/bus.h>
   31 
   32 #
   33 # The AGP interface is used internally to the agp driver to isolate the
   34 # differences between various AGP chipsets into chipset mini drivers. It
   35 # should not be used outside the AGP driver. The kernel api for accessing
   36 # AGP functionality is described in <pci/agpvar.h>
   37 #
   38 INTERFACE agp;
   39 
   40 CODE {
   41         static int
   42         null_agp_chipset_flush(device_t dev)
   43         {
   44                 return (ENXIO);
   45         }
   46 };
   47 
   48 #
   49 # Return the current aperture size.
   50 #
   51 METHOD u_int32_t get_aperture {
   52         device_t        dev;
   53 };
   54 
   55 #
   56 # Set the size of the aperture. Return EINVAL on error or 0 on success.
   57 #
   58 METHOD int set_aperture {
   59         device_t        dev;
   60         u_int32_t       aperture;
   61 };
   62 
   63 #
   64 # Bind a single page in the AGP aperture to a given physical address.
   65 # The offset is a byte offset within the aperture which must be
   66 # aligned to an AGP page boundary.
   67 #
   68 METHOD int bind_page {
   69         device_t        dev;
   70         vm_offset_t     offset;
   71         vm_offset_t     physical;
   72 };
   73 
   74 #
   75 # Unbind a single page in the AGP aperture.
   76 #
   77 METHOD int unbind_page {
   78         device_t        dev;
   79         vm_offset_t     offset;
   80 };
   81 
   82 #
   83 # Flush the GATT TLB. This is used after a call to bind_page to
   84 # ensure that any mappings cached in the chipset are discarded.
   85 #
   86 METHOD void flush_tlb {
   87         device_t        dev;
   88 };
   89 
   90 #
   91 # Enable the agp hardware with the relavent mode. The mode bits are
   92 # defined in <pci/agpreg.h>
   93 #
   94 METHOD int enable {
   95         device_t        dev;
   96         u_int32_t       mode;
   97 };
   98 
   99 #
  100 # Allocate memory of a given type. The type is a chipset-specific
  101 # code which is used by certain integrated agp graphics chips
  102 # (basically just the i810 for now) to access special features of
  103 # the chipset. An opaque handle representing the memory region is
  104 # returned and can be used as an argument to free_memory, bind_memory 
  105 # and unbind_memory.
  106 #
  107 # The size is specified in bytes but must be a multiple of the AGP
  108 # page size.
  109 #
  110 METHOD struct agp_memory * alloc_memory {
  111         device_t        dev;
  112         int             type;
  113         vm_size_t       size;
  114 };
  115 
  116 #
  117 # Free a memory region previously allocated with alloc_memory. Return
  118 # EBUSY if the memory is bound.
  119 #
  120 METHOD int free_memory {
  121         device_t        dev;
  122         struct agp_memory *mem;
  123 };
  124 
  125 #
  126 # Bind a memory region to a specific byte offset within the chipset's
  127 # AGP aperture. This effectively defines a range of contiguous
  128 # physical address which alias the (possibly uncontiguous) pages in
  129 # the memory region.
  130 #
  131 METHOD int bind_memory {
  132         device_t        dev;
  133         struct agp_memory *mem;
  134         vm_offset_t     offset;
  135 };
  136 
  137 #
  138 # Unbind a memory region bound with bind_memory.
  139 #
  140 METHOD int unbind_memory {
  141         device_t        dev;
  142         struct agp_memory *handle;
  143 };
  144 
  145 METHOD int chipset_flush {
  146         device_t        dev;
  147 } DEFAULT null_agp_chipset_flush;

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