From: H. Peter Anvin <[email protected]> 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 <[email protected]> --- 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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
- References:
- x86 setup code rewrite in C - revised
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 01/33] x86 setup: MAINTAINERS: formally take responsibility for the i386 boot code
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 02/33] hd.c: remove BIOS/CMOS queries
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 03/33] include/asm-i386/boot.h: This is <asm/boot.h>, not <linux/boot.h>
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 04/33] Unify the CPU features vectors between i386 and x86-64
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 05/33] Change CONFIG_X86_MINIMUM_CPU_MODEL to CONFIG_X86_MINIMUM_CPU_FAMILY
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 06/33] Clean up struct screen_info (<linux/screen_info.h>)
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 07/33] Use a new CPU feature word to cover all Intel features that are spread around
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 08/33] Define zero-page offset 0x1e4 as a scratch field, and use it
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 09/33] Make definitions for struct e820entry and struct e820map consistent
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 10/33] Make struct boot_params a real structure, and remove obsolete fields
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 11/33] x86-64: add CONFIG_PHYSICAL_ALIGN for consistency with i386
- From: "H. Peter Anvin" <[email protected]>
- [x86 setup 12/33] x86-64: add symbolic constants for the boot segment selectors
- From: "H. Peter Anvin" <[email protected]>
- x86 setup code rewrite in C - revised
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