1 files changed, 47 insertions, 0 deletions
diff --git a/libgloss/visium/serial-inbyte.c b/libgloss/visium/serial-inbyte.c
new file mode 100644
index 000000000..579c9699b
--- /dev/null
+++ b/libgloss/visium/serial-inbyte.c
@@ -0,0 +1,47 @@
+/* Serial Input for the Visium processor.
+
+   Copyright (c) 2015 Rolls-Royce Controls and Data Services Limited.
+   All rights reserved.
+
+   Redistribution and use in source and binary forms, with or without
+   modification, are permitted provided that the following conditions are met:
+
+     * Redistributions of source code must retain the above copyright notice,
+       this list of conditions and the following disclaimer.
+     * Redistributions in binary form must reproduce the above copyright
+       notice, this list of conditions and the following disclaimer in the
+       documentation and/or other materials provided with the distribution.
+     * Neither the name of Rolls-Royce Controls and Data Services Limited nor
+       the names of its contributors may be used to endorse or promote products
+       derived from this software without specific prior written permission.
+
+   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+   AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+   IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+   ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+   LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+   CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+   SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+   CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+   ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+   THE POSSIBILITY OF SUCH DAMAGE.  */
+
+char
+inbyte (void)
+{
+#ifdef __VISIUM_ARCH_MCM__
+  volatile int *const rxdata = (int *) 0x20003920;
+  volatile int *const rxqs   = (int *) 0x20003930;
+#else
+  volatile int *const rxdata = (int *) 0x20001a20;
+  volatile int *const rxqs   = (int *) 0x20001a30;
+#endif
+  int bytes_in_fifo = 0;
+
+  while (!bytes_in_fifo)
+    bytes_in_fifo = *rxqs;
+
+  /* Read one character.  */
+  return (*rxdata) & 0xff;
+}