2# Copyright (c) 2000 Doug Rabson
5# Redistribution and use in source and binary forms, with or without
6# modification, are permitted provided that the following conditions
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.
14# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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17# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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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
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>
48# Return the current aperture size.
55# Set the size of the aperture. Return EINVAL on error or 0 on success.
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.
74# Unbind a single page in the AGP aperture.
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.
90# Enable the agp hardware with the relavent mode. The mode bits are
91# defined in <dev/agp/agpreg.h>
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
106# The size is specified in bytes but must be a multiple of the AGP
116# Free a memory region previously allocated with alloc_memory. Return
117# EBUSY if the memory is bound.
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
137# Unbind a memory region bound with bind_memory.
struct agp_memory * handle
METHOD u_int32_t get_aperture
DEFAULT null_agp_chipset_flush
METHOD struct agp_memory * alloc_memory