From bdb213bb545117ae30131fef9fa9d190baae2e44 Mon Sep 17 00:00:00 2001
From: "H. Peter Anvin" <hpa@zytor.com>
Date: Thu, 31 May 2007 15:42:50 -0700
Subject: [PATCH] Implement syslinux_serial_console_info()

---
 com32/lib/Makefile          |  3 ++-
 com32/lib/syslinux/serial.c | 52 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 54 insertions(+), 1 deletion(-)
 create mode 100644 com32/lib/syslinux/serial.c

diff --git a/com32/lib/Makefile b/com32/lib/Makefile
index 9082e3b..f2713aa 100644
--- a/com32/lib/Makefile
+++ b/com32/lib/Makefile
@@ -64,7 +64,8 @@ LIBOBJS = \
 	\
 	sys/x86_init_fpu.o math/pow.o math/strtod.o			\
 	\
-	syslinux/idle.o	syslinux/features.o syslinux/config.o		\
+	syslinux/idle.o							\
+	syslinux/features.o syslinux/config.o syslinux/serial.o		\
 	\
 	syslinux/addlist.o syslinux/freelist.o syslinux/memmap.o	\
 	syslinux/movebits.o syslinux/shuffle.o syslinux/shuffle_pm.o	\
diff --git a/com32/lib/syslinux/serial.c b/com32/lib/syslinux/serial.c
new file mode 100644
index 0000000..79db921
--- /dev/null
+++ b/com32/lib/syslinux/serial.c
@@ -0,0 +1,52 @@
+/* ----------------------------------------------------------------------- *
+ *
+ *   Copyright 2007 H. Peter Anvin - All Rights Reserved
+ *
+ *   Permission is hereby granted, free of charge, to any person
+ *   obtaining a copy of this software and associated documentation
+ *   files (the "Software"), to deal in the Software without
+ *   restriction, including without limitation the rights to use,
+ *   copy, modify, merge, publish, distribute, sublicense, and/or
+ *   sell copies of the Software, and to permit persons to whom
+ *   the Software is furnished to do so, subject to the following
+ *   conditions:
+ *
+ *   The above copyright notice and this permission notice shall
+ *   be included in all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ *   OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ *   HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ *   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ *   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ *   OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * syslinux/serial.c
+ *
+ * SYSLINUX serial console query
+ */
+
+#include <klibc/compiler.h>
+#include <syslinux/config.h>
+#include <string.h>
+#include <com32.h>
+
+struct syslinux_serial_console_info __syslinux_serial_console_info;
+
+void __constructor __syslinux_get_serial_console_info(void)
+{
+  static com32sys_t reg;
+
+  memset(&reg, 0, sizeof reg);
+  reg.eax.w[0] = 0x000b;
+  __intcall(0x22, &reg, &reg);
+
+  __syslinux_serial_console_info.iobase  = reg.edx.w[0];
+  __syslinux_serial_console_info.divisor = reg.ecx.w[0];
+  __syslinux_serial_console_info.flowctl = reg.ebx.w[0];
+}
-- 
2.7.4