2 * This file is part of the coreboot project.
4 * Copyright (C) 2002 Eric Biederman <ebiederm@xmission.com>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; version 2 of the License.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
25 * Clear the CR0[2] bit (the "Emulation" flag, EM).
27 * This indicates that the processor has an (internal or external)
28 * x87 FPU, i.e. floating point operations will be executed by the
29 * hardware (and not emulated in software).
31 * Additionally, if this bit is not cleared, MMX/SSE instructions won't
32 * work, i.e., they will trigger an invalid opcode exception (#UD).