From f7f4a5fbd21bf7fc4f207ddaf5126c78c0d1e0b5 Mon Sep 17 00:00:00 2001 From: "H. Peter Anvin" Date: Wed, 11 Jul 2007 12:18:38 -0700 Subject: [PATCH] Header file to produce 16-bit code with gcc 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 Signed-off-by: Linus Torvalds --- arch/i386/boot/code16gcc.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+) 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 000000000000..3bd848093b9d --- /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