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Header file to produce 16-bit code with gcc

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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@zytor.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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H. Peter Anvin 2007-07-11 12:18:38 -07:00 • committed by Linus Torvalds
parent 8afd2af889
commit f7f4a5fbd2
1 changed files with 15 additions and 0 deletions
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arch/i386/boot/code16gcc.h Normal file
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/*
* 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