Add support for EMS emulation to doscmd. This requires changing the

interface for callbacks to doscmd from DOS, obsoleting the instbsdi
redirector.  (redir.com replaces it)

A temporary hack is in place so the instbsdi program will (hopefully) work
in the short term.
Submitted by:	Helmut F. Wirth <hfwirth@ping.at>

1 files changed, 50 insertions, 0 deletions

diff --git a/usr.bin/doscmd/emuint.h b/usr.bin/doscmd/emuint.h
new file mode 100644
index 0000000..d90b60e
--- /dev/null
+++ b/usr.bin/doscmd/emuint.h
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 1997 Helmut Wirth <hfwirth@ping.at>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice immediately at the beginning of the file, witout modification,
+ *    this list of conditions, and the following disclaimer.
+ * 2. 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.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
+ *
+ *	$Id$
+ */
+
+
+/* 
+ * The emulator helper interrupt:
+ *
+ * Interrupt 0xFF is used by some emulator functions. It is a portal into
+ * the emulator and cannot be used by ordinary DOS applications directly
+ * The interrupt 0xFF is called by helper functions under DOS (such as
+ * the redirector interfcae and the EMS emulation).
+ * There are functions and subfunctions defined. (See emuint.c for details)
+ */
+
+/* The redirector interface (formerly instbsdi.exe) */
+#define EMU_REDIR	0x1	/* Function for redirector interface */
+/* No subfunctions defined */
+
+/* Expanded memory (EMS) driver callback */
+#define EMU_EMS		0x2	/* Function for EMS driver control */
+/* subfunctions for EMS */
+#define EMU_EMS_CTL	0x0	/* Control function, used during init */
+#define EMU_EMS_CALL	0x1	/* Callback, calls are routed via this */