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4e612cddb9
updating the GTT and flushing the AGP TLB by storing the GTT in write-combining memory. On x86 flushing the AGP TLB is done by an I/O operation or a store to a MMIO register in uncacheable memory. Both cases imply that WC buffers are flushed so no memory barriers are needed. On powerpc there is no WC memory type. It maps to uncacheable memory and two stores to uncacheable memory, such as to the GTT and then to an MMIO register, are strongly ordered, so no memory barriers are needed either. MFC after: 1 month
109 lines
3.8 KiB
C
109 lines
3.8 KiB
C
/*-
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* Copyright (c) 2000 Doug Rabson
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _PCI_AGPPRIV_H_
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#define _PCI_AGPPRIV_H_
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/*
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* This file *must not* be included by code outside the agp driver itself.
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*/
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#include <sys/agpio.h>
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#include <dev/agp/agpvar.h>
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#ifdef AGP_DEBUG
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#define AGP_DPF(fmt, ...) do { \
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printf("agp: " fmt, ##__VA_ARGS__); \
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} while (0)
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#else
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#define AGP_DPF(fmt, ...) do {} while (0)
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#endif
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#include "agp_if.h"
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/*
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* Data structure to describe an AGP memory allocation.
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*/
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TAILQ_HEAD(agp_memory_list, agp_memory);
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struct agp_memory {
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TAILQ_ENTRY(agp_memory) am_link; /* wiring for the tailq */
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int am_id; /* unique id for block */
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vm_size_t am_size; /* number of bytes allocated */
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int am_type; /* chipset specific type */
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struct vm_object *am_obj; /* VM object owning pages */
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vm_offset_t am_physical; /* bogus hack for i810 */
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vm_offset_t am_offset; /* page offset if bound */
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int am_is_bound; /* non-zero if bound */
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};
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/*
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* All chipset drivers must have this at the start of their softc.
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*/
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struct agp_softc {
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struct resource *as_aperture; /* location of aperture */
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int as_aperture_rid;
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u_int32_t as_maxmem; /* allocation upper bound */
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u_int32_t as_allocated; /* amount allocated */
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enum agp_acquire_state as_state;
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struct agp_memory_list as_memory; /* list of allocated memory */
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int as_nextid; /* next memory block id */
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int as_isopen; /* user device is open */
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struct cdev *as_devnode; /* from make_dev */
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struct mtx as_lock; /* lock for access to GATT */
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};
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struct agp_gatt {
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u_int32_t ag_entries;
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u_int32_t *ag_virtual;
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vm_offset_t ag_physical;
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};
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u_int8_t agp_find_caps(device_t dev);
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struct agp_gatt *agp_alloc_gatt(device_t dev);
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void agp_set_aperture_resource(device_t dev, int rid);
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void agp_free_cdev(device_t dev);
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void agp_free_gatt(struct agp_gatt *gatt);
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void agp_free_res(device_t dev);
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int agp_generic_attach(device_t dev);
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int agp_generic_detach(device_t dev);
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u_int32_t agp_generic_get_aperture(device_t dev);
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int agp_generic_set_aperture(device_t dev,
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u_int32_t aperture);
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int agp_generic_enable(device_t dev, u_int32_t mode);
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struct agp_memory *agp_generic_alloc_memory(device_t dev, int type,
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vm_size_t size);
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int agp_generic_free_memory(device_t dev,
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struct agp_memory *mem);
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int agp_generic_bind_memory(device_t dev,
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struct agp_memory *mem,
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vm_offset_t offset);
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int agp_generic_unbind_memory(device_t dev,
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struct agp_memory *mem);
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#endif /* !_PCI_AGPPRIV_H_ */
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