Implement syslinux_serial_console_info()

1 files changed, 52 insertions, 0 deletions

diff --git a/com32/lib/syslinux/serial.c b/com32/lib/syslinux/serial.c
new file mode 100644
index 00000000..79db9219
--- /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];
+}