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emu/z80pack-1.9/z80sim/iosim.c

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+/*
+ * Z80SIM  -  a	Z80-CPU	simulator
+ *
+ * Copyright (C) 1987-2006 by Udo Munk
+ *
+ * This modul of the simulator contains a simple terminal I/O
+ * simulation as an example.
+ *
+ * History:
+ * 28-SEP-87 Development on TARGON/35 with AT&T Unix System V.3
+ * 11-JAN-89 Release 1.1
+ * 08-FEB-89 Release 1.2
+ * 13-MAR-89 Release 1.3
+ * 09-FEB-90 Release 1.4 Ported to TARGON/31 M10/30
+ * 20-DEC-90 Release 1.5 Ported to COHERENT 3.0
+ * 10-JUN-92 Release 1.6 long casting problem solved with COHERENT 3.2
+ *			 and some optimization
+ * 25-JUN-92 Release 1.7 comments in english
+ * 03-OCT-06 Release 1.8 changed to ANSI C for modern POSIX OS's
+ */
+
+/*
+ *	Sample I/O-handler
+ *
+ *	Port 0 input:	reads the next byte from stdin
+ *	Port 0 output:	writes the byte to stdout
+ *
+ *	All the other ports are connected to a I/O-trap handler,
+ *	I/O to this ports stops the simulation with an I/O error.
+ */
+
+#include <stdio.h>
+#include "sim.h"
+#include "simglb.h"
+
+/*
+ *	Forward declarations of the I/O functions
+ *	for all port addresses.
+ */
+static BYTE io_trap(void);
+static BYTE p000_in(void);
+static void p000_out(BYTE);
+
+/*
+ *	This two dimensional array contains function pointers
+ *	for every I/O port (0 - 255), to do the needed I/O.
+ *	The first entry is for input, the second for output.
+ */
+static BYTE (*port[256][2]) () = {
+	{ p000_in, p000_out }		/* port	0 */
+};
+
+/*
+ *	This function is to initiate the I/O devices.
+ *	It will be called from the CPU simulation before
+ *	any operation with the Z80 is possible.
+ *
+ *	In this sample I/O simulation we initialize all
+ *	unused port with an error trap handler, so that
+ *	simulation stops at I/O on the unused ports.
+ *
+ *	See the I/O simulation of CP/M for a more complex
+ *	example.
+ */
+void init_io(void)
+{
+	register int i;
+
+	for (i = 1; i <= 255; i++)
+		port[i][0] = port[i][1]	= io_trap;
+}
+
+/*
+ *	This function is to stop the I/O devices. It is
+ *	called from the CPU simulation on exit.
+ *
+ *	Here is just nothing to do, see the I/O simulation
+ *	of CP/M for a more complex example.
+ */
+void exit_io(void)
+{
+}
+
+/*
+ *	This is the main handler for all IN op-codes,
+ *	called by the simulator. It calls the input
+ *	function for port adr.
+ */
+BYTE io_in(BYTE adr)
+{
+	return((*port[adr][0]) ());
+}
+
+/*
+ *	This is the main handler for all OUT op-codes,
+ *	called by the simulator. It calls the output
+ *	function for port adr.
+ */
+void io_out(BYTE adr, BYTE data)
+{
+	(*port[adr][1])	(data);
+}
+
+/*
+ *	I/O trap funtion
+ *	This function should be added into all unused
+ *	entrys of the port array. It stops the emulation
+ *	with an I/O error.
+ */
+static BYTE io_trap(void)
+{
+	if (i_flag) {
+		cpu_error = IOTRAP;
+		cpu_state = STOPPED;
+	}
+	return((BYTE) 0);
+}
+
+/*
+ *	I/O function port 0 read:
+ *	Read next byte from stdin.
+ */
+static BYTE p000_in(void)
+{
+	return((BYTE) getchar());
+}
+
+/*
+ *	I/O function port 0 write:
+ *	Write byte to stdout and flush the output.
+ */
+static void p000_out(BYTE data)
+{
+	putchar((int) data);
+	fflush(stdout);
+}