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Message-Id: <ab1907cf095c021d5e721b9df84d7c4e6de82e66.1184181208.git.hpa@zytor.com>
Date: Wed, 11 Jul 2007 12:18:38 -0700
From: "H. Peter Anvin" <hpa@...or.com>
To: torvalds@...ux-foundation.org, andi@...stfloor.org,
linux-kernel@...r.kernel.org
Cc: "H. Peter Anvin" <hpa@...or.com>
Subject: [x86 setup 13/33] Header file to produce 16-bit code with gcc
From: H. Peter Anvin <hpa@...or.com>
gcc for i386 can be used with the assembly prefix ".code16gcc" to generate
16-bit (real-mode) code. This header file provides the assembly prefix.
Signed-off-by: H. Peter Anvin <hpa@...or.com>
---
arch/i386/boot/code16gcc.h | 15 +++++++++++++++
1 files changed, 15 insertions(+), 0 deletions(-)
create mode 100644 arch/i386/boot/code16gcc.h
diff --git a/arch/i386/boot/code16gcc.h b/arch/i386/boot/code16gcc.h
new file mode 100644
index 0000000..3bd8480
--- /dev/null
+++ b/arch/i386/boot/code16gcc.h
@@ -0,0 +1,15 @@
+/*
+ * code16gcc.h
+ *
+ * This file is -include'd when compiling 16-bit C code.
+ * Note: this asm() needs to be emitted before gcc omits any code.
+ * Depending on gcc version, this requires -fno-unit-at-a-time or
+ * -fno-toplevel-reorder.
+ *
+ * Hopefully gcc will eventually have a real -m16 option so we can
+ * drop this hack long term.
+ */
+
+#ifndef __ASSEMBLY__
+asm(".code16gcc");
+#endif
--
1.5.2.2
-
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