libpynq (release 5EWC0-2023 version 0.2.3 of 2023-10-06 18:15)
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uio.c
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1/******************************************************************************
2 * Copyright (c) 2016, Xilinx, Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice,
9 * this list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * 3. Neither the name of the copyright holder nor the names of its
16 * contributors may be used to endorse or promote products derived from
17 * this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
20 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
21 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
26 * OR BUSINESS INTERRUPTION). HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
27 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
28 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
29 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 *
31 *****************************************************************************/
32/******************************************************************************
33 *
34 *
35 * @file uio.c
36 *
37 * Functions to interact with linux UIO. No safe checks here, so users must
38 * know what they are doing.
39 *
40 * <pre>
41 * MODIFICATION HISTORY:
42 *
43 * Ver Who Date Changes
44 * ----- --- ------- -----------------------------------------------
45 * 1.00a yrq 12/05/17 Initial release
46 *
47 * </pre>
48 *
49 *****************************************************************************/
50
51#include "uio.h"
52#include <fcntl.h>
53#include <stdio.h>
54#include <stdlib.h>
55#include <string.h>
56#include <sys/mman.h>
57#include <unistd.h>
58
59/******************************************************************************
60 * Function to set the UIO device.
61 * @param uio_index is the uio index in /dev list.
62 * @param length is the length of the MMAP in bytes.
63 * @return A pointer pointing to the MMAP of the UIO.
64 *****************************************************************************/
65void *setUIO(int uio_index, int length) {
66 char uio_buf[32];
67 int uio_fd;
68 void *uio_ptr;
69
70 sprintf(uio_buf, "/dev/uio%d", uio_index);
71 uio_fd = open(uio_buf, O_RDWR);
72 if (uio_fd < 1) {
73 printf("Invalid UIO device file: %s.\n", uio_buf);
74 }
75 // mmap the UIO devices
76 uio_ptr = mmap(NULL, length, PROT_READ | PROT_WRITE, MAP_SHARED, uio_fd, 0);
77 return uio_ptr;
78}
79
80/******************************************************************************
81 * Function to set the UIO device.
82 * @param uio_ptr is the uio pointer to be freed.
83 * @param length is the length of the MMAP.
84 * @return 0 on success; -1 otherwise.
85 *****************************************************************************/
86int unsetUIO(void *uio_ptr, int length) { return munmap(uio_ptr, length); }
void * setUIO(int uio_index, int length)
Definition uio.c:65
int unsetUIO(void *uio_ptr, int length)
Definition uio.c:86