1 files changed, 111 insertions, 0 deletions
diff --git a/nx-X11/programs/Xserver/hw/xfree86/os-support/usl/usl_video.c b/nx-X11/programs/Xserver/hw/xfree86/os-support/usl/usl_video.c
new file mode 100644
index 000000000..2c85ea92c
--- /dev/null
+++ b/nx-X11/programs/Xserver/hw/xfree86/os-support/usl/usl_video.c
@@ -0,0 +1,111 @@
+/* $XdotOrg: xc/programs/Xserver/hw/xfree86/os-support/usl/usl_video.c,v 1.2 2005/11/08 06:33:30 jkj Exp $ */
+/*
+ * Copyrught 2005 Kean Johnston <jkj@sco.com>
+ * Copyright 1990,91 by Thomas Roell, Dinkelscherben, Germany
+ * Copyright 1993 by David Wexelblat <dwex@goblin.org>
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation, and that the names of Thomas Roell, David Dawes 
+ * and Kean Johnston not be used in advertising or publicity pertaining to
+ * distribution of the software without specific, written prior permission.
+ * Thomas Roell, David Dawes and Kean Johnston make no representations
+ * about the suitability of this software for any purpose.  It is provided
+ * "as is" without express or implied warranty.
+ *
+ * THOMAS ROELL, DAVID DAWES AND KEAN JOHNSTON DISCLAIM ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL THOMAS ROELLm DAVID WEXELBLAT
+ * OR KEAN JOHNSTON BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
+ * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
+ * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
+ * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
+ * THIS SOFTWARE.
+ *
+ */
+/* $XConsortium$ */
+
+#include "X.h"
+
+#define _NEED_SYSI86
+#include "xf86.h"
+#include "xf86Priv.h"
+#include "xf86_OSlib.h"
+#include "xf86OSpriv.h"
+
+#ifndef MAP_FAILED
+#define MAP_FAILED ((void *)-1)
+#endif
+
+static Bool
+linearVidMem(void)
+{
+  return TRUE;
+}
+
+static pointer
+mapVidMem(int ScreenNum, unsigned long Base, unsigned long Size, int flags)
+{
+  pointer base;
+  int fd;
+
+  fd = open(DEV_MEM, (flags & VIDMEM_READONLY) ? O_RDONLY : O_RDWR);
+  if (fd < 0) {
+    FatalError("xf86MapVidMem: failed to open %s (%s)\n",
+      DEV_MEM, strerror(errno));
+  }
+  base = mmap((caddr_t)0, Size, (flags & VIDMEM_READONLY) ?
+	     PROT_READ : (PROT_READ | PROT_WRITE),
+	     MAP_SHARED, fd, (off_t)Base);
+  close(fd);
+
+  if (base == MAP_FAILED) {
+    FatalError("%s: Could not mmap framebuffer [s=%x,a=%x] (%s)\n",
+      "xf86MapVidMem", Size, Base, strerror(errno));
+  }
+  return(base);
+}
+
+/* ARGSUSED */
+static void
+unmapVidMem(int ScreenNum, pointer Base, unsigned long Size)
+{
+  munmap(Base, Size);
+}
+
+/*
+ * For some SVR4 versions, a 32-bit read is done for the first location
+ * in each page when the page is first mapped.  If this is done while
+ * memory access is enabled for regions that have read side-effects,
+ * this can cause unexpected results, including lockups on some hardware.
+ * This function is called to make sure each page is mapped while it is
+ * safe to do so.
+ */
+
+#define X_PAGE_SIZE 4096
+
+static void
+readSideEffects(int ScreenNum, pointer Base, unsigned long Size)
+{
+  unsigned long base, end, addr;
+  CARD32 val;
+
+  base = (unsigned long)Base;
+  end = base + Size;
+
+  for (addr = base; addr < end; addr += X_PAGE_SIZE)
+    val = *(volatile CARD32 *)addr;
+}
+
+void
+xf86OSInitVidMem(VidMemInfoPtr pVidMem)
+{
+  pVidMem->linearSupported = linearVidMem();
+  pVidMem->mapMem = mapVidMem;
+  pVidMem->unmapMem = unmapVidMem;
+  pVidMem->readSideEffects = readSideEffects;
+  pVidMem->initialised = TRUE;
+}
+