From eb70608df5da6706dd057a08d832db4fdd07d66b Mon Sep 17 00:00:00 2001
From: "H. Peter Anvin" <hpa@zytor.com>
Date: Fri, 20 Jul 2007 15:31:09 -0700
Subject: [PATCH] Add syslinux_reboot()

---
 com32/include/syslinux/reboot.h | 41 +++++++++++++++++++++++++++++++++++
 com32/lib/Makefile              |  4 ++--
 com32/lib/syslinux/reboot.c     | 47 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 90 insertions(+), 2 deletions(-)
 create mode 100644 com32/include/syslinux/reboot.h
 create mode 100644 com32/lib/syslinux/reboot.c

diff --git a/com32/include/syslinux/reboot.h b/com32/include/syslinux/reboot.h
new file mode 100644
index 00000000..7a8bc108
--- /dev/null
+++ b/com32/include/syslinux/reboot.h
@@ -0,0 +1,41 @@
+/* ----------------------------------------------------------------------- *
+ *
+ *   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/reboot.h
+ *
+ * Reboot the system
+ */
+
+#ifndef _SYSLINUX_REBOOT_H
+#define _SYSLINUX_REBOOT_H
+
+#include <klibc/compiler.h>
+
+__noreturn syslinux_reboot(int warm);
+
+#endif /* _SYSLINUX_REBOOT_H */
diff --git a/com32/lib/Makefile b/com32/lib/Makefile
index b759cd01..e94bafc6 100644
--- a/com32/lib/Makefile
+++ b/com32/lib/Makefile
@@ -23,7 +23,7 @@ LIBOBJS = \
 	libgcc/__muldi3.o libgcc/__udivmoddi4.o libgcc/__umoddi3.o	\
 	libgcc/__divdi3.o libgcc/__moddi3.o				\
 	\
-	sys/intcall.o sys/farcall.o					\
+	sys/intcall.o sys/farcall.o sys/zeroregs.o			\
 	sys/entry.o sys/exit.o sys/argv.o sys/times.o			\
 	sys/fileinfo.o sys/opendev.o sys/read.o sys/write.o sys/ftell.o \
 	sys/close.o sys/open.o sys/fileread.o sys/fileclose.o		\
@@ -64,7 +64,7 @@ LIBOBJS = \
 	\
 	sys/x86_init_fpu.o math/pow.o math/strtod.o			\
 	\
-	syslinux/idle.o							\
+	syslinux/idle.o	syslinux/reboot.o				\
 	syslinux/features.o syslinux/config.o syslinux/serial.o		\
 	\
 	syslinux/addlist.o syslinux/freelist.o syslinux/memmap.o	\
diff --git a/com32/lib/syslinux/reboot.c b/com32/lib/syslinux/reboot.c
new file mode 100644
index 00000000..32905cb9
--- /dev/null
+++ b/com32/lib/syslinux/reboot.c
@@ -0,0 +1,47 @@
+/* ----------------------------------------------------------------------- *
+ *   
+ *   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.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * reboot.c
+ *
+ * Provoke a system reboot
+ */
+
+#include <stddef.h>
+#include <com32.h>
+#include <syslinux/reboot.h>
+
+__noreturn syslinux_reboot(int warm)
+{
+  uint16_t * const reboot_flag = (uint16_t *)0x472;
+  
+  *reboot_flag = warm ? 0x1234 : 0;
+  __farcall(0xf000, 0xfff0, &__com32_zero_regs, NULL);
+
+  while(1)
+    asm volatile("hlt");
+}
-- 
2.11.4.GIT