From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933382AbXGKTZx (ORCPT ); Wed, 11 Jul 2007 15:25:53 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1762659AbXGKTTk (ORCPT ); Wed, 11 Jul 2007 15:19:40 -0400 Received: from terminus.zytor.com ([192.83.249.54]:38281 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932411AbXGKTTb (ORCPT ); Wed, 11 Jul 2007 15:19:31 -0400 From: "H. Peter Anvin" To: torvalds@linux-foundation.org, andi@firstfloor.org, linux-kernel@vger.kernel.org Cc: "H. Peter Anvin" Subject: [x86 setup 13/33] Header file to produce 16-bit code with gcc Date: Wed, 11 Jul 2007 12:18:38 -0700 Message-Id: <1184181540369-git-send-email-hpa@zytor.com> X-Mailer: git-send-email 1.5.2.2 In-Reply-To: <11841815401013-git-send-email-hpa@zytor.com> References: <1184181538674-git-send-email-hpa@zytor.com> <118418153862-git-send-email-hpa@zytor.com> <11841815382283-git-send-email-hpa@zytor.com> <11841815392122-git-send-email-hpa@zytor.com> <11841815393975-git-send-email-hpa@zytor.com> <11841815393014-git-send-email-hpa@zytor.com> <1184181539416-git-send-email-hpa@zytor.com> <118418153972-git-send-email-hpa@zytor.com> <11841815391923-git-send-email-hpa@zytor.com> <11841815403678-git-send-email-hpa@zytor.com> <11841815403041-git-send-email-hpa@zytor.com> <11841815402349-git-send-email-hpa@zytor.com> <11841815401013-git-send-email-hpa@zytor.com> Message-Id: In-Reply-To: <7aca4ce0a222438c94300a2ea535270a21db8812.1184181208.git.hpa@zytor.com> References: <7aca4ce0a222438c94300a2ea535270a21db8812.1184181208.git.hpa@zytor.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org From: H. Peter Anvin 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 --- 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