freebsd-nq/tools/bus_space/C/lang.c
Marcel Moolenaar 0c2b180a35 Add a C libary and a Python module that implements an API similar
to bus_space(9) and that uses the proto(4) driver for talking to
hardware. If the I/O resource is a memory mapped I/O resource,
then mmap(2) will be attempted to avoid read(2)/write(2) overhead.

Sponsored by:	Juniper Networks, Inc.
2014-04-28 18:06:11 +00:00

101 lines
2.4 KiB
C

/*-
* Copyright (c) 2014 Marcel Moolenaar
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <errno.h>
#include "bus_space.h"
#include "libbus_space.h"
int
bus_space_read_1(int rid, long ofs)
{
uint8_t val;
return ((!bs_read(rid, ofs, &val, sizeof(val))) ? -1 : (int)val);
}
int
bus_space_read_2(int rid, long ofs)
{
uint16_t val;
return ((!bs_read(rid, ofs, &val, sizeof(val))) ? -1 : (int)val);
}
int64_t
bus_space_read_4(int rid, long ofs)
{
uint32_t val;
return ((!bs_read(rid, ofs, &val, sizeof(val))) ? -1 : (int64_t)val);
}
int
bus_space_write_1(int rid, long ofs, uint8_t val)
{
return ((!bs_write(rid, ofs, &val, sizeof(val))) ? errno : 0);
}
int
bus_space_write_2(int rid, long ofs, uint16_t val)
{
return ((!bs_write(rid, ofs, &val, sizeof(val))) ? errno : 0);
}
int
bus_space_write_4(int rid, long ofs, uint32_t val)
{
return ((!bs_write(rid, ofs, &val, sizeof(val))) ? errno : 0);
}
int
bus_space_map(const char *dev)
{
return (bs_map(dev));
}
int
bus_space_unmap(int rid)
{
return ((!bs_unmap(rid)) ? errno : 0);
}
int
bus_space_subregion(int rid, long ofs, long sz)
{
return (bs_subregion(rid, ofs, sz));
}