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: releng/11.1/sys/dev/agp/agp_if.m 235782 2012-05-22 10:59:26Z kib $
   27 #
   28 
   29 #include <sys/bus.h>
   30 
   31 #
   32 # The AGP interface is used internally to the agp driver to isolate the
   33 # differences between various AGP chipsets into chipset mini drivers. It
   34 # should not be used outside the AGP driver. The kernel api for accessing
   35 # AGP functionality is described in <dev/agp/agpvar.h>
   36 #
   37 INTERFACE agp;
   38 
   39 CODE {
   40         static int
   41         null_agp_chipset_flush(device_t dev)
   42         {
   43                 return (ENXIO);
   44         }
   45 };
   46 
   47 #
   48 # Return the current aperture size.
   49 #
   50 METHOD u_int32_t get_aperture {
   51         device_t        dev;
   52 };
   53 
   54 #
   55 # Set the size of the aperture. Return EINVAL on error or 0 on success.
   56 #
   57 METHOD int set_aperture {
   58         device_t        dev;
   59         u_int32_t       aperture;
   60 };
   61 
   62 #
   63 # Bind a single page in the AGP aperture to a given physical address.
   64 # The offset is a byte offset within the aperture which must be
   65 # aligned to an AGP page boundary.
   66 #
   67 METHOD int bind_page {
   68         device_t        dev;
   69         vm_offset_t     offset;
   70         vm_offset_t     physical;
   71 };
   72 
   73 #
   74 # Unbind a single page in the AGP aperture.
   75 #
   76 METHOD int unbind_page {
   77         device_t        dev;
   78         vm_offset_t     offset;
   79 };
   80 
   81 #
   82 # Flush the GATT TLB. This is used after a call to bind_page to
   83 # ensure that any mappings cached in the chipset are discarded.
   84 #
   85 METHOD void flush_tlb {
   86         device_t        dev;
   87 };
   88 
   89 #
   90 # Enable the agp hardware with the relavent mode. The mode bits are
   91 # defined in <dev/agp/agpreg.h>
   92 #
   93 METHOD int enable {
   94         device_t        dev;
   95         u_int32_t       mode;
   96 };
   97 
   98 #
   99 # Allocate memory of a given type. The type is a chipset-specific
  100 # code which is used by certain integrated agp graphics chips
  101 # (basically just the i810 for now) to access special features of
  102 # the chipset. An opaque handle representing the memory region is
  103 # returned and can be used as an argument to free_memory, bind_memory 
  104 # and unbind_memory.
  105 #
  106 # The size is specified in bytes but must be a multiple of the AGP
  107 # page size.
  108 #
  109 METHOD struct agp_memory * alloc_memory {
  110         device_t        dev;
  111         int             type;
  112         vm_size_t       size;
  113 };
  114 
  115 #
  116 # Free a memory region previously allocated with alloc_memory. Return
  117 # EBUSY if the memory is bound.
  118 #
  119 METHOD int free_memory {
  120         device_t        dev;
  121         struct agp_memory *mem;
  122 };
  123 
  124 #
  125 # Bind a memory region to a specific byte offset within the chipset's
  126 # AGP aperture. This effectively defines a range of contiguous
  127 # physical address which alias the (possibly uncontiguous) pages in
  128 # the memory region.
  129 #
  130 METHOD int bind_memory {
  131         device_t        dev;
  132         struct agp_memory *mem;
  133         vm_offset_t     offset;
  134 };
  135 
  136 #
  137 # Unbind a memory region bound with bind_memory.
  138 #
  139 METHOD int unbind_memory {
  140         device_t        dev;
  141         struct agp_memory *handle;
  142 };
  143 
  144 METHOD int chipset_flush {
  145         device_t        dev;
  146 } DEFAULT null_agp_chipset_flush;

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