NetBSD/lib/libarch/alpha/alpha_pci_mem.c

134 lines
4.1 KiB
C

/* $NetBSD: alpha_pci_mem.c,v 1.1 2000/02/26 18:59:36 thorpej Exp $ */
/*-
* Copyright (c) 2000 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Support for mapping PCI/EISA/ISA memory space. This is currently used
* to provide such support for XFree86. In a perfect world, this would go
* away in favor of a real bus space mapping framework.
*/
#include <sys/param.h>
#include <sys/mman.h>
#include <machine/sysarch.h>
#include <fcntl.h>
#include <paths.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
struct alpha_bus_window *alpha_pci_mem_windows;
int alpha_pci_mem_window_count;
void *
alpha_pci_mem_map(memaddr, memsize, flags, rabst)
bus_addr_t memaddr;
bus_size_t memsize;
int flags;
struct alpha_bus_space_translation *rabst;
{
struct alpha_bus_window *abw;
void *addr;
int prefetchable = flags & BUS_SPACE_MAP_PREFETCHABLE;
int linear = flags & BUS_SPACE_MAP_LINEAR;
bus_size_t offset;
int i, fd;
/*
* Can't have linear without prefetchable.
*/
if (linear && !prefetchable)
return (MAP_FAILED);
if (alpha_pci_mem_windows == NULL) {
i = alpha_bus_getwindows(ALPHA_BUS_TYPE_PCI_MEM, &abw);
if (i <= 0)
return (MAP_FAILED);
alpha_pci_mem_windows = abw;
alpha_pci_mem_window_count = i;
}
for (i = 0; i < alpha_pci_mem_window_count; i++) {
abw = &alpha_pci_mem_windows[i];
if (memaddr < abw->abw_abst.abst_bus_start ||
(memaddr + (memsize - 1)) > abw->abw_abst.abst_bus_end)
continue;
/* If we want linear, the window must be dense. */
if (linear && (abw->abw_abst.abst_flags & ABST_DENSE) == 0)
continue;
/* Looks like we have a winner! */
goto found;
}
found:
fd = open(_PATH_MEM, O_RDWR, 0600);
if (fd == -1)
return (MAP_FAILED);
memsize <<= abw->abw_abst.abst_addr_shift;
offset = (memaddr - abw->abw_abst.abst_bus_start) <<
abw->abw_abst.abst_addr_shift;
addr = mmap(NULL, memsize, PROT_READ|PROT_WRITE, MAP_FILE|MAP_SHARED,
fd, (off_t) (abw->abw_abst.abst_sys_start + offset));
(void) close(fd);
if (addr != MAP_FAILED) {
/*
* Make a copy of the space translation so that the caller
* can do the correct access.
*/
*rabst = abw->abw_abst;
}
return (addr);
}
void
alpha_pci_mem_unmap(addr, size)
void *addr;
bus_size_t size;
{
(void) munmap(addr, size);
}