lib/buffer.c

   1 /*
   2  *      $Id: buffer.c,v 1.1 1999/01/22 21:05:14 mj Exp $
   3  *
   4  *      The PCI Library -- Buffered Access
   5  *
   6  *      Copyright (c) 1997--1999 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
   7  *
   8  *      Can be freely distributed and used under the terms of the GNU GPL.
   9  */
  10
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <stdarg.h>
  14 #include <string.h>
  15
  16 #include "internal.h"
  17
  18 static int
  19 buff_read(struct pci_dev *d, int pos, byte *buf, int len)
  20 {
  21   memcpy(buf, (byte *)d->aux + pos, len);
  22   return 1;
  23 }
  24
  25 static int
  26 buff_write(struct pci_dev *d, int UNUSED pos, byte * UNUSED buf, int UNUSED len)
  27 {
  28   d->access->error("buffer: Writing to configuration space not supported.");
  29   return 0;
  30 }
  31
  32 static struct pci_methods pm_buffer = {
  33   "Buffer",
  34   NULL,                                 /* config */
  35   NULL,                                 /* Shall not be called */
  36   NULL,                                 /* No init nor cleanup */
  37   NULL,
  38   NULL,                                 /* No scanning */
  39   pci_generic_fill_info,
  40   buff_read,
  41   buff_write,
  42   NULL,                                 /* init_dev */
  43   NULL                                  /* cleanup_dev */
  44 };
  45
  46 void
  47 pci_setup_buffer(struct pci_dev *d, byte *buf)
  48 {
  49   if (d->methods->cleanup_dev)
  50     d->methods->cleanup_dev(d);
  51   d->methods = &pm_buffer;
  52   d->aux = buf;
  53 }