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| author | H. Peter Anvin | 2007-07-11 21:18:38 +0200 |
|---|---|---|
| committer | Linus Torvalds | 2007-07-12 19:55:54 +0200 |
| commit | f7f4a5fbd21bf7fc4f207ddaf5126c78c0d1e0b5 (patch) | |
| tree | 497fa10d3eca17e9872b54adea55cf8ed6bf9baa | |
| parent | x86-64: add symbolic constants for the boot segment selectors (diff) | |
| download | kernel-qcow2-linux-f7f4a5fbd21bf7fc4f207ddaf5126c78c0d1e0b5.tar.gz kernel-qcow2-linux-f7f4a5fbd21bf7fc4f207ddaf5126c78c0d1e0b5.tar.xz kernel-qcow2-linux-f7f4a5fbd21bf7fc4f207ddaf5126c78c0d1e0b5.zip | |
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 <hpa@zytor.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | arch/i386/boot/code16gcc.h | 15 |
1 files changed, 15 insertions, 0 deletions
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 |