1 /* 2 * Copyright (c) KATO Takenori, 1997, 1998. 3 * 4 * All rights reserved. Unpublished rights reserved under the copyright 5 * laws of Japan. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer as 13 * the first lines of this file unmodified. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include "opt_cpu.h" 34 35 #include <sys/param.h> 36 #include <sys/kernel.h> 37 #include <sys/systm.h> 38 #include <sys/sysctl.h> 39 40 #include <machine/cputypes.h> 41 #include <machine/md_var.h> 42 #include <machine/specialreg.h> 43 44 void initializecpu(void); 45 46 static int hw_instruction_sse; 47 SYSCTL_INT(_hw, OID_AUTO, instruction_sse, CTLFLAG_RD, 48 &hw_instruction_sse, 0, "SIMD/MMX2 instructions available in CPU"); 49 50 int cpu; /* Are we 386, 386sx, 486, etc? */ 51 u_int cpu_feature; /* Feature flags */ 52 u_int cpu_high; /* Highest arg to CPUID */ 53 u_int cpu_id; /* Stepping ID */ 54 u_int cpu_procinfo; /* HyperThreading Info / Brand Index / CLFUSH */ 55 char cpu_vendor[20]; /* CPU Origin code */ 56 u_int cpu_fxsr; /* SSE enabled */ 57 58 /* 59 * Initialize CR4 (Control register 4) to enable SSE instructions. 60 */ 61 void 62 enable_sse(void) 63 { 64 if ((cpu_feature & CPUID_XMM) && (cpu_feature & CPUID_FXSR)) { 65 load_cr4(rcr4() | CR4_FXSR | CR4_XMM); 66 cpu_fxsr = hw_instruction_sse = 1; 67 } 68 } 69 70 void 71 initializecpu(void) 72 { 73 74 switch (cpu) { 75 default: 76 break; 77 } 78 enable_sse(); 79 } 80