Allow in/out to work in DOS programs.

Submitted by: Parag Patel
PR: bin/8486

usr.bin/doscmd/config.c

@@ -238,6 +238,21 @@ read_config(FILE *fp)
 	    	fprintf(stderr, "Boot drive must be either A: or C:\n");
 		quit(1);
 	    }
+	} else if (!strcasecmp(av[0], "portmap")) {
+	    int p, c;
+	    if (ac < 2 || ac > 3 || !isdigit(av[1][0]) ||
+		    (ac == 3 && !isdigit(av[2][0]))) {
+		fprintf(stderr, "Usage: portmap port [count]\n");
+		quit(1);
+	    }
+	    p = strtol(av[1], 0, 0);
+	    c = (ac == 3) ? strtol(av[2], 0, 0) : 1;
+	    iomap_port(p, c);
+
+	    while (c-- > 0) {
+		define_input_port_handler(p++, inb_port);
+		define_output_port_handler(p++, outb_port);
+	    }
     	} else if (!strcasecmp(av[0], "setver")) {
 	    int v;
 	    if (ac != 3 || !(v = strtol(av[2], 0, 0))) {

usr.bin/doscmd/doscmd.1

@@ -188,6 +188,18 @@ to
 .\"
 .\"
 .\"
+.It Fl p Ar port Ns Xo
+.Op : Ns Ar cnt
+.Xc
+Map the requested io
+.Ar port
+(with optional range up to to
+.Ar port+cnt Ns No -1 )
+to the real hardware I/O port(s).
+This will likely require root privs to access them.
+.\"
+.\"
+.\"
 .It Fl P
 Enable tracing of io port calls (such as
 .Li inb ,
@@ -434,6 +446,19 @@ This code is lightly tested and may not suit all needs.
 .\"
 .\"
 .\"
+.It Cm portmap Xo
+.Ar port
+.Op Ar count
+.Xc
+Map the requested io
+.Ar port
+(with optional range up to to
+.Ar port+count Ns No -1 )
+to the real hardware I/O port(s).
+This will likely require root privs to access them.
+.\"
+.\"
+.\"
 .It Cm "setver command version"
 Cause doscmd, when emulating DOS, to report
 .Cm version

usr.bin/doscmd/doscmd.c

@@ -480,7 +480,7 @@ do_args(int argc, char *argv[])
     FILE	*fp;
     char 	*col;
 
-    while ((c = getopt (argc, argv, "234Oc:TkCIEMPRLAU:S:HDtzvVxXYfbri:o:d:")) != -1) {
+    while ((c = getopt (argc, argv, "234Oc:TkCIEMPRLAU:S:HDtzvVxXYfbri:o:p:d:")) != -1) {
 	switch (c) {
 	case 'd':
 	    if (fp = fopen(optarg, "w")) {
@@ -515,6 +515,7 @@ do_args(int argc, char *argv[])
 		i = strtol(col, 0, 0);
 	    }
 	    p = strtol(optarg, 0, 0);
+	    iomap_port(p, i);
 
 	    while (i-- > 0)
 		define_input_port_handler(p++, inb_traceport);
@@ -526,10 +527,25 @@ do_args(int argc, char *argv[])
 		i = strtol(col, 0, 0);
 	    }
 	    p = strtol(optarg, 0, 0);
+	    iomap_port(p, i);
 
 	    while (i-- > 0)
 		define_output_port_handler(p++, outb_traceport);
 	    break;
+	case 'p':
+	    i = 1;
+	    if (col = strchr(optarg, ':')) {
+		*col++ = 0;
+		i = strtol(col, 0, 0);
+	    }
+	    p = strtol(optarg, 0, 0);
+	    iomap_port(p, i);
+
+	    while (i-- > 0) {
+		define_input_port_handler(p++, inb_port);
+		define_output_port_handler(p++, outb_port);
+	    }
+	    break;
 
 	case 'r':
 	    raw_kbd = 1;
@@ -834,6 +850,9 @@ struct io_range {
 	int enable;
 };
 
+/* This is commented out as it is never called.  Turn it back on if needed.
+ */
+#if COMMENTED_OUT
 static void
 iomap_init(void)
 {
@@ -844,6 +863,7 @@ iomap_init(void)
                 { 0x1c80, 2, 1 },               /* 0x1c80 - 0x1c81 */
                 { 0x2c80, 2, 1 },               /* 0x2c80 - 0x2c81 */
                 { 0x3c80, 2, 1 },               /* 0x3c80 - 0x3c81 */
+                { 0x378,  8, 1 },               /* 0x378 - 0x37F */
                 { 0x3c4,  2, 1 },               /* 0x3c4 - 0x3c5 */
                 { 0x3c5,  2, 1 },               /* 0x3ce - 0x3cf */
 #else
@@ -851,8 +871,21 @@ iomap_init(void)
 #endif
                 { 0, 0, 0 }
         };
-
+	
         for (i = 0; io[i].length; i++)
                 if (i386_set_ioperm(io[i].start, io[i].length, io[i].enable) < 0)
                         err(1, "i386_set_ioperm");
 }
+#endif
+
+/* This is used to map in only the specified port range, instead of all
+   the ports or only certain port ranges.
+ */
+void
+iomap_port(int port, int count)
+{
+    if (i386_set_ioperm(port, count, 1) < 0)
+	err(1, "i386_set_ioperm");
+
+    debug(D_PORT,"mapped I/O port: port=%#x count=%d\n", port, count);
+}

usr.bin/doscmd/doscmd.h

@@ -150,7 +150,8 @@ extern int		open_prog(char *name);
 extern void		done(regcontext_t *REGS, int val);
 extern void 		quit(int);
 extern void		call_on_quit(void (*)(void *), void *);
-
+extern void		iomap_port(int port, int count);
+ 
 /* signal.c */
 extern struct sigframe	*saved_sigframe;
 extern regcontext_t	*saved_regcontext;
@@ -288,4 +289,6 @@ void video_setborder(int);
 
 void outb_traceport(int, unsigned char);
 unsigned char inb_traceport(int);
+void outb_port(int, unsigned char);
+unsigned char inb_port(int);
 

usr.bin/doscmd/port.c

@@ -158,6 +158,21 @@ inb_traceport(int port)
     return(byte);
 }
 
+/*
+ * Real input/output to (hopefully) iomapped port
+ */
+void
+outb_port(int port, unsigned char byte)
+{
+    out(port, byte);
+}
+
+unsigned char
+inb_port(int port)
+{
+    return in(port);
+}
+
 /* 
  * Fake input/output ports
  */