142 lines
4.3 KiB
C
142 lines
4.3 KiB
C
/* $NetBSD: alpha_pci_mem.c,v 1.4 2002/07/19 22:03:39 mycroft Exp $ */
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/*-
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* Copyright (c) 2000 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jason R. Thorpe.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Support for mapping PCI/EISA/ISA memory space. This is currently used
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* to provide such support for XFree86. In a perfect world, this would go
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* away in favor of a real bus space mapping framework.
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*/
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#include <sys/param.h>
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#include <sys/mman.h>
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#include <machine/sysarch.h>
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#include <fcntl.h>
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#include <paths.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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struct alpha_bus_window *alpha_pci_mem_windows;
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int alpha_pci_mem_window_count;
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void *
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alpha_pci_mem_map(bus_addr_t memaddr, bus_size_t memsize, int flags,
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struct alpha_bus_space_translation *rabst)
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{
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struct alpha_bus_window *abw;
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void *addr;
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int prefetchable = flags & BUS_SPACE_MAP_PREFETCHABLE;
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int linear = flags & BUS_SPACE_MAP_LINEAR;
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bus_size_t offset;
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int i, fd;
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/*
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* Can't have linear without prefetchable.
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*/
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if (linear && !prefetchable)
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return (MAP_FAILED);
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if (alpha_pci_mem_windows == NULL) {
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i = alpha_bus_getwindows(ALPHA_BUS_TYPE_PCI_MEM, &abw);
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if (i <= 0)
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return (MAP_FAILED);
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alpha_pci_mem_windows = abw;
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alpha_pci_mem_window_count = i;
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}
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for (i = 0; i < alpha_pci_mem_window_count; i++) {
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abw = &alpha_pci_mem_windows[i];
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if (memaddr < abw->abw_abst.abst_bus_start ||
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(memaddr + (memsize - 1)) > abw->abw_abst.abst_bus_end)
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continue;
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/*
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* Prefetchable memory must be mapped in dense space;
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* otherwise use sparse space.
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*/
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if (prefetchable &&
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(abw->abw_abst.abst_flags & ABST_DENSE) == 0)
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continue;
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if (!prefetchable &&
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(abw->abw_abst.abst_flags & ABST_DENSE) != 0)
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continue;
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/* Looks like we have a winner! */
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goto found;
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}
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/* Not found in any of the windows. */
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return (MAP_FAILED);
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found:
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fd = open(_PATH_MEM, O_RDWR, 0600);
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if (fd == -1)
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return (MAP_FAILED);
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if (prefetchable)
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abw->abw_abst.abst_addr_shift = 0;
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memsize <<= abw->abw_abst.abst_addr_shift;
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offset = (memaddr - abw->abw_abst.abst_bus_start) <<
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abw->abw_abst.abst_addr_shift;
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addr = mmap(NULL, memsize, PROT_READ|PROT_WRITE, MAP_FILE|MAP_SHARED,
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fd, (off_t) (abw->abw_abst.abst_sys_start + offset));
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(void) close(fd);
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if (addr != MAP_FAILED) {
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/*
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* Make a copy of the space translation so that the caller
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* can do the correct access.
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*/
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*rabst = abw->abw_abst;
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}
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return (addr);
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}
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void
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alpha_pci_mem_unmap(struct alpha_bus_space_translation *abst, void *addr,
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bus_size_t size)
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{
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(void) munmap(addr, size << abst->abst_addr_shift);
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}
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