xorg-server-1.4/hw/xfree86/os-support/lynxos/lynx_mmap.c

   1 /*
   2  * Copyright 1993 by Thomas Mueller
   3  *
   4  * Permission to use, copy, modify, distribute, and sell this software and its
   5  * documentation for any purpose is hereby granted without fee, provided that
   6  * the above copyright notice appear in all copies and that both that
   7  * copyright notice and this permission notice appear in supporting
   8  * documentation, and that the name of Thomas Mueller not be used in
   9  * advertising or publicity pertaining to distribution of the software without
  10  * specific, written prior permission.  Thomas Mueller makes no representations
  11  * about the suitability of this software for any purpose.  It is provided
  12  * "as is" without express or implied warranty.
  13  *
  14  * THOMAS MUELLER DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  15  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  16  * EVENT SHALL THOMAS MUELLER BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  17  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  18  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  19  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  20  * PERFORMANCE OF THIS SOFTWARE.
  21  *
  22  */
  23
  24
  25 #ifdef HAVE_XORG_CONFIG_H
  26 #include <xorg-config.h>
  27 #endif
  28
  29 #include <X11/X.h>
  30
  31 #include "xf86.h"
  32 #include "xf86Priv.h"
  33 #include "xf86_OSlib.h"
  34
  35 /*
  36  * Read BIOS using smem_create facility
  37  */
  38
  39 _X_EXPORT int
  40 xf86ReadBIOS(unsigned long Base, unsigned long Offset, unsigned char *Buf,
  41              int Len)
  42 {
  43 #if defined(__powerpc__)
  44         xf86Msg(X_WARNING, "xf86ReadBios: no BIOS-probe on PowerPC\n");
  45         return(-1);
  46 #else
  47         char *p;
  48         int mlen;
  49
  50         mlen = (Offset + Len + 4095) & ~4095;
  51         p = smem_create("BIOS-probe", (char *)Base, mlen, SM_READ);
  52         if (p == NULL)
  53         {
  54                 /* check if there is a stale segment around */
  55                 if (smem_remove("BIOS-probe") == 0) {
  56                     xf86Msg(X_INFO,
  57                         "xf86ReadBios: removed stale smem_ segment\n");
  58                     p = smem_create("BIOS-probe", (char *)Base, mlen, SM_READ);
  59                 }
  60                 if (p == NULL) {
  61                     xf86Msg(X_WARNING, "xf86ReadBios: Failed to smem_create "
  62                             "Base %x len %x %s \n",
  63                             Base, mlen, strerror(errno));
  64                     return(-1);
  65                 }
  66         }
  67         memcpy(Buf, p + Offset, Len);
  68         smem_create(NULL, p, 0, SM_DETACH);
  69         smem_remove("BIOS-probe");
  70         return(Len);
  71 #endif
  72 }