xref: /freebsd/sys/amd64/amd64/initcpu.c (revision 1e413cf93298b5b97441a21d9a50fdcd0ee9945e)
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  Unpublished rights reserved under the copyright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 #include <vm/vm.h>
45 #include <vm/pmap.h>
46 
47 static int	hw_instruction_sse;
48 SYSCTL_INT(_hw, OID_AUTO, instruction_sse, CTLFLAG_RD,
49     &hw_instruction_sse, 0, "SIMD/MMX2 instructions available in CPU");
50 
51 int	cpu;			/* Are we 386, 386sx, 486, etc? */
52 u_int	cpu_feature;		/* Feature flags */
53 u_int	cpu_feature2;		/* Feature flags */
54 u_int	amd_feature;		/* AMD feature flags */
55 u_int	amd_feature2;		/* AMD feature flags */
56 u_int	cpu_high;		/* Highest arg to CPUID */
57 u_int	cpu_exthigh;		/* Highest arg to extended CPUID */
58 u_int	cpu_id;			/* Stepping ID */
59 u_int	cpu_procinfo;		/* HyperThreading Info / Brand Index / CLFUSH */
60 u_int	cpu_procinfo2;		/* Multicore info */
61 char	cpu_vendor[20];		/* CPU Origin code */
62 u_int	cpu_fxsr;		/* SSE enabled */
63 u_int	cpu_mxcsr_mask;		/* Valid bits in mxcsr */
64 
65 /*
66  * Initialize CPU control registers
67  */
68 void
69 initializecpu(void)
70 {
71 	uint64_t msr;
72 
73 	if ((cpu_feature & CPUID_XMM) && (cpu_feature & CPUID_FXSR)) {
74 		load_cr4(rcr4() | CR4_FXSR | CR4_XMM);
75 		cpu_fxsr = hw_instruction_sse = 1;
76 	}
77 	if ((amd_feature & AMDID_NX) != 0) {
78 		msr = rdmsr(MSR_EFER) | EFER_NXE;
79 		wrmsr(MSR_EFER, msr);
80 		pg_nx = PG_NX;
81 	}
82 }
83