dev.c

   1 /*-
   2  * Copyright (C) 2012 glevand <geoffrey.levand@mail.ru>
   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
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer,
  10  *    without modification, immediately at the beginning of the file.
  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  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 #include <stdio.h>
  28 #include <stdint.h>
  29 #include <string.h>
  30 #include <sys/types.h>
  31 #include <sys/stat.h>
  32 #include <fcntl.h>
  33 #include <unistd.h>
  34
  35 /*
  36  * dev_do_lv1call
  37  */
  38 int dev_do_lv1call(const char *device, uint64_t num_lv1call,
  39     uint64_t *in_args, int num_in_args, uint64_t *out_args, int64_t *result)
  40 {
  41         int fd;
  42         uint64_t buf[9];
  43         int len, n;
  44
  45         if (num_in_args > 8)
  46                 return (-1);
  47
  48         fd = open(device, O_RDWR);
  49         if (fd < 0)
  50                 return (-1);
  51
  52         buf[0] = num_lv1call;
  53         memcpy(buf + 1, in_args, num_in_args * sizeof(uint64_t));
  54
  55         len = (1 + num_in_args) * sizeof(uint64_t);
  56
  57         n = write(fd, buf, len);
  58         if (n != len) {
  59                 close(fd);
  60                 return (-1);
  61         }
  62
  63         n = read(fd, buf, sizeof(buf));
  64         if (n < sizeof(int64_t)) {
  65                 close(fd);
  66                 return (-1);
  67         }
  68
  69         close(fd);
  70
  71         n = (n - sizeof(int64_t)) / sizeof(uint64_t);
  72
  73         *result = (int64_t) buf[0];
  74         memcpy(out_args, buf + 1, n * sizeof(uint64_t));
  75
  76         return (n);
  77 }