| /* | |
| * This file is part of the coreboot project. | |
| * | |
| * Copyright (C) 2002 Eric Biederman <ebiederm@xmission.com> | |
| * | |
| * 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; version 2 of the License. | |
| * | |
| * 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, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
| */ | |
| /* | |
| * Put the processor back into a reset state | |
| * with respect to the XMM registers. | |
| */ | |
| xorps %xmm0, %xmm0 | |
| xorps %xmm1, %xmm1 | |
| xorps %xmm2, %xmm2 | |
| xorps %xmm3, %xmm3 | |
| xorps %xmm4, %xmm4 | |
| xorps %xmm5, %xmm5 | |
| xorps %xmm6, %xmm6 | |
| xorps %xmm7, %xmm7 | |
| /* | |
| * Disable SSE instructions. | |
| * | |
| * Clear CR4[9] (OSFXSR) and CR4[10] (OSXMMEXCPT) so that the | |
| * processor can no longer execute SSE instructions, and unmasked | |
| * SIMD floating point exceptions will generate an invalid opcode | |
| * exception (#UD). | |
| */ | |
| movl %cr4, %eax | |
| andl $~(3 << 9), %eax | |
| movl %eax, %cr4 | |