debug.s

来自「C++ 编写的EROS RTOS」· S 代码 · 共 40 行

/*
 * Copyright (C) 1998, 1999, Jonathan S. Shapiro.
 *
 * This file is part of the EROS Operating System.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2,
 * or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */


#include <eros/i486/asm.h>

#ifdef TIMESTAMPS
ENTRY(rdtsc)
	pushl	%ebp
	movl	%esp,%ebp
	
	xorl	%eax,%eax
	xorl	%edx,%edx
	
				/* At some point, checking CPUID might be
				   an idea */
	.byte 0x0f
	.byte 0x31		/* RDTSC instr - results to %edx:%eax */

1:	leave
	ret
#endif