1 /*- 2 * Copyright (c) KATO Takenori, 1997, 1998. 3 * Copyright (c) 2008 The DragonFly Project. 4 * 5 * All rights reserved. Unpublished rights reserved under the copyright 6 * laws of Japan. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer as 14 * the first lines of this file unmodified. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include "opt_cpu.h" 32 33 #include <sys/param.h> 34 #include <sys/kernel.h> 35 #include <sys/systm.h> 36 #include <sys/sysctl.h> 37 38 #include <machine/cputypes.h> 39 #include <machine/md_var.h> 40 #include <machine/specialreg.h> 41 #include <machine/smp.h> 42 43 #include <vm/vm.h> 44 #include <vm/pmap.h> 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_feature2; /* Feature flags */ 53 u_int amd_feature; /* AMD feature flags */ 54 u_int amd_feature2; /* AMD feature flags */ 55 u_int via_feature_rng; /* VIA RNG features */ 56 u_int via_feature_xcrypt; /* VIA ACE features */ 57 u_int cpu_high; /* Highest arg to CPUID */ 58 u_int cpu_exthigh; /* Highest arg to extended CPUID */ 59 u_int cpu_id; /* Stepping ID */ 60 u_int cpu_procinfo; /* HyperThreading Info / Brand Index / CLFUSH */ 61 u_int cpu_procinfo2; /* Multicore info */ 62 char cpu_vendor[20]; /* CPU Origin code */ 63 u_int cpu_vendor_id; /* CPU vendor ID */ 64 u_int cpu_fxsr; /* SSE enabled */ 65 u_int cpu_mxcsr_mask; /* Valid bits in mxcsr */ 66 67 SYSCTL_UINT(_hw, OID_AUTO, via_feature_rng, CTLFLAG_RD, 68 &via_feature_rng, 0, "VIA C3/C7 RNG feature available in CPU"); 69 SYSCTL_UINT(_hw, OID_AUTO, via_feature_xcrypt, CTLFLAG_RD, 70 &via_feature_xcrypt, 0, "VIA C3/C7 xcrypt feature available in CPU"); 71 72 /* 73 * Initialize special VIA C3/C7 features 74 */ 75 static void 76 init_via(void) 77 { 78 u_int regs[4], val; 79 u_int64_t msreg; 80 81 do_cpuid(0xc0000000, regs); 82 val = regs[0]; 83 if (val >= 0xc0000001) { 84 do_cpuid(0xc0000001, regs); 85 val = regs[3]; 86 } else 87 val = 0; 88 89 /* Enable RNG if present and disabled */ 90 if (val & VIA_CPUID_HAS_RNG) { 91 if (!(val & VIA_CPUID_DO_RNG)) { 92 msreg = rdmsr(0x110B); 93 msreg |= 0x40; 94 wrmsr(0x110B, msreg); 95 } 96 via_feature_rng = VIA_HAS_RNG; 97 } 98 /* Enable AES engine if present and disabled */ 99 if (val & VIA_CPUID_HAS_ACE) { 100 if (!(val & VIA_CPUID_DO_ACE)) { 101 msreg = rdmsr(0x1107); 102 msreg |= (0x01 << 28); 103 wrmsr(0x1107, msreg); 104 } 105 via_feature_xcrypt |= VIA_HAS_AES; 106 } 107 /* Enable ACE2 engine if present and disabled */ 108 if (val & VIA_CPUID_HAS_ACE2) { 109 if (!(val & VIA_CPUID_DO_ACE2)) { 110 msreg = rdmsr(0x1107); 111 msreg |= (0x01 << 28); 112 wrmsr(0x1107, msreg); 113 } 114 via_feature_xcrypt |= VIA_HAS_AESCTR; 115 } 116 /* Enable SHA engine if present and disabled */ 117 if (val & VIA_CPUID_HAS_PHE) { 118 if (!(val & VIA_CPUID_DO_PHE)) { 119 msreg = rdmsr(0x1107); 120 msreg |= (0x01 << 28/**/); 121 wrmsr(0x1107, msreg); 122 } 123 via_feature_xcrypt |= VIA_HAS_SHA; 124 } 125 /* Enable MM engine if present and disabled */ 126 if (val & VIA_CPUID_HAS_PMM) { 127 if (!(val & VIA_CPUID_DO_PMM)) { 128 msreg = rdmsr(0x1107); 129 msreg |= (0x01 << 28/**/); 130 wrmsr(0x1107, msreg); 131 } 132 via_feature_xcrypt |= VIA_HAS_MM; 133 } 134 } 135 136 /* 137 * Initialize CPU control registers 138 */ 139 void 140 initializecpu(void) 141 { 142 uint64_t msr; 143 144 if ((cpu_feature & CPUID_XMM) && (cpu_feature & CPUID_FXSR)) { 145 load_cr4(rcr4() | CR4_FXSR | CR4_XMM); 146 cpu_fxsr = hw_instruction_sse = 1; 147 } 148 if ((amd_feature & AMDID_NX) != 0) { 149 msr = rdmsr(MSR_EFER) | EFER_NXE; 150 wrmsr(MSR_EFER, msr); 151 #if JG 152 pg_nx = PG_NX; 153 #endif 154 } 155 if (cpu_vendor_id == CPU_VENDOR_CENTAUR && 156 X86_64_CPU_FAMILY(cpu_id) == 0x6 && 157 X86_64_CPU_MODEL(cpu_id) >= 0xf) 158 init_via(); 159 } 160