Add support for uart(4) being a debug port for the GDB backend.

1 files changed, 101 insertions, 0 deletions

diff --git a/sys/dev/uart/uart_dbg.c b/sys/dev/uart/uart_dbg.c
new file mode 100644
index 0000000..71938b9
--- /dev/null
+++ b/sys/dev/uart/uart_dbg.c
@@ -0,0 +1,101 @@
+/*
+ * Copyright (c) 2004 Marcel Moolenaar
+ * 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, 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.
+ *
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/bus.h>
+#include <sys/kernel.h>
+#include <machine/bus.h>
+
+#include <gdb/gdb.h>
+
+#include <dev/uart/uart.h>
+#include <dev/uart/uart_cpu.h>
+
+static gdb_probe_f uart_dbg_probe;
+static gdb_init_f uart_dbg_init;
+static gdb_term_f uart_dbg_term;
+static gdb_getc_f uart_dbg_getc;
+static gdb_checkc_f uart_dbg_checkc;
+static gdb_putc_f uart_dbg_putc;
+
+GDB_DBGPORT(uart, uart_dbg_probe, uart_dbg_init, uart_dbg_term,
+    uart_dbg_checkc, uart_dbg_getc, uart_dbg_putc);
+
+static struct uart_devinfo uart_dbgport;
+
+static int
+uart_dbg_probe(void)
+{
+
+	if (uart_cpu_getdev(UART_DEV_DBGPORT, &uart_dbgport))
+		return (-1);
+
+	if (uart_probe(&uart_dbgport))
+		return (-1);
+
+	return (0);
+}
+
+static void
+uart_dbg_init(void)
+{
+
+	uart_dbgport.type = UART_DEV_DBGPORT;
+	uart_add_sysdev(&uart_dbgport);
+	uart_init(&uart_dbgport);
+}
+
+static void
+uart_dbg_term(void)
+{
+
+	uart_term(&uart_dbgport);
+}
+
+static void
+uart_dbg_putc(int c)
+{
+
+	uart_putc(&uart_dbgport, c);
+}
+
+static int
+uart_dbg_checkc(void)
+{
+
+	return (uart_poll(&uart_dbgport));
+}
+
+static int
+uart_dbg_getc(void)
+{
+
+	return (uart_getc(&uart_dbgport));
+}