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/pci/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 # $FreeBSD$
   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 <pci/agpvar.h>
   36 #
   37 INTERFACE agp;
   38 
   39 #
   40 # Return the current aperture size.
   41 #
   42 METHOD u_int32_t get_aperture {
   43         device_t        dev;
   44 };
   45 
   46 #
   47 # Set the size of the aperture. Return EINVAL on error or 0 on success.
   48 #
   49 METHOD int set_aperture {
   50         device_t        dev;
   51         u_int32_t       aperture;
   52 };
   53 
   54 #
   55 # Bind a single page in the AGP aperture to a given physical address.
   56 # The offset is a byte offset within the aperture which must be
   57 # aligned to an AGP page boundary.
   58 #
   59 METHOD int bind_page {
   60         device_t        dev;
   61         vm_offset_t     offset;
   62         vm_offset_t     physical;
   63 };
   64 
   65 #
   66 # Unbind a single page in the AGP aperture.
   67 #
   68 METHOD int unbind_page {
   69         device_t        dev;
   70         vm_offset_t     offset;
   71 };
   72 
   73 #
   74 # Flush the GATT TLB. This is used after a call to bind_page to
   75 # ensure that any mappings cached in the chipset are discarded.
   76 #
   77 METHOD void flush_tlb {
   78         device_t        dev;
   79 };
   80 
   81 #
   82 # Enable the agp hardware with the relavent mode. The mode bits are
   83 # defined in <pci/agpreg.h>
   84 #
   85 METHOD int enable {
   86         device_t        dev;
   87         u_int32_t       mode;
   88 };
   89 
   90 #
   91 # Allocate memory of a given type. The type is a chipset-specific
   92 # code which is used by certain integrated agp graphics chips
   93 # (basically just the i810 for now) to access special features of
   94 # the chipset. An opaque handle representing the memory region is
   95 # returned and can be used as an argument to free_memory, bind_memory 
   96 # and unbind_memory.
   97 #
   98 # The size is specified in bytes but must be a multiple of the AGP
   99 # page size.
  100 #
  101 METHOD struct agp_memory * alloc_memory {
  102         device_t        dev;
  103         int             type;
  104         vm_size_t       size;
  105 };
  106 
  107 #
  108 # Free a memory region previously allocated with alloc_memory. Return
  109 # EBUSY if the memory is bound.
  110 #
  111 METHOD int free_memory {
  112         device_t        dev;
  113         struct agp_memory *mem;
  114 };
  115 
  116 #
  117 # Bind a memory region to a specific byte offset within the chipset's
  118 # AGP aperture. This effectively defines a range of contiguous
  119 # physical address which alias the (possibly uncontiguous) pages in
  120 # the memory region.
  121 #
  122 METHOD int bind_memory {
  123         device_t        dev;
  124         struct agp_memory *mem;
  125         vm_offset_t     offset;
  126 };
  127 
  128 #
  129 # Unbind a memory region bound with bind_memory.
  130 #
  131 METHOD int unbind_memory {
  132         device_t        dev;
  133         struct agp_memory *handle;
  134 };

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