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 Unpublished rights reserved under the copyright 5 * laws of Japan. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are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/pcpu.h> 38 #include <sys/systm.h> 39 #include <sys/sysctl.h> 40 41 #include <machine/cputypes.h> 42 #include <machine/md_var.h> 43 #include <machine/specialreg.h> 44 45 #include <vm/vm.h> 46 #include <vm/pmap.h> 47 48 static int hw_instruction_sse; 49 SYSCTL_INT(_hw, OID_AUTO, instruction_sse, CTLFLAG_RD, 50 &hw_instruction_sse, 0, "SIMD/MMX2 instructions available in CPU"); 51 /* 52 * -1: automatic (default) 53 * 0: keep enable CLFLUSH 54 * 1: force disable CLFLUSH 55 */ 56 static int hw_clflush_disable = -1; 57 58 int cpu; /* Are we 386, 386sx, 486, etc? */ 59 u_int cpu_feature; /* Feature flags */ 60 u_int cpu_feature2; /* Feature flags */ 61 u_int amd_feature; /* AMD feature flags */ 62 u_int amd_feature2; /* AMD feature flags */ 63 u_int amd_pminfo; /* AMD advanced power management info */ 64 u_int via_feature_rng; /* VIA RNG features */ 65 u_int via_feature_xcrypt; /* VIA ACE features */ 66 u_int cpu_high; /* Highest arg to CPUID */ 67 u_int cpu_exthigh; /* Highest arg to extended CPUID */ 68 u_int cpu_id; /* Stepping ID */ 69 u_int cpu_procinfo; /* HyperThreading Info / Brand Index / CLFUSH */ 70 u_int cpu_procinfo2; /* Multicore info */ 71 char cpu_vendor[20]; /* CPU Origin code */ 72 u_int cpu_vendor_id; /* CPU vendor ID */ 73 u_int cpu_fxsr; /* SSE enabled */ 74 u_int cpu_mxcsr_mask; /* Valid bits in mxcsr */ 75 u_int cpu_clflush_line_size = 32; 76 u_int cpu_stdext_feature; 77 u_int cpu_stdext_feature2; 78 u_int cpu_max_ext_state_size; 79 u_int cpu_mon_mwait_flags; /* MONITOR/MWAIT flags (CPUID.05H.ECX) */ 80 u_int cpu_mon_min_size; /* MONITOR minimum range size, bytes */ 81 u_int cpu_mon_max_size; /* MONITOR minimum range size, bytes */ 82 u_int cpu_maxphyaddr; /* Max phys addr width in bits */ 83 84 SYSCTL_UINT(_hw, OID_AUTO, via_feature_rng, CTLFLAG_RD, 85 &via_feature_rng, 0, "VIA RNG feature available in CPU"); 86 SYSCTL_UINT(_hw, OID_AUTO, via_feature_xcrypt, CTLFLAG_RD, 87 &via_feature_xcrypt, 0, "VIA xcrypt feature available in CPU"); 88 89 static void 90 init_amd(void) 91 { 92 93 /* 94 * Work around Erratum 721 for Family 10h and 12h processors. 95 * These processors may incorrectly update the stack pointer 96 * after a long series of push and/or near-call instructions, 97 * or a long series of pop and/or near-return instructions. 98 * 99 * http://support.amd.com/us/Processor_TechDocs/41322_10h_Rev_Gd.pdf 100 * http://support.amd.com/us/Processor_TechDocs/44739_12h_Rev_Gd.pdf 101 * 102 * Hypervisors do not provide access to the errata MSR, 103 * causing #GP exception on attempt to apply the errata. The 104 * MSR write shall be done on host and persist globally 105 * anyway, so do not try to do it when under virtualization. 106 */ 107 switch (CPUID_TO_FAMILY(cpu_id)) { 108 case 0x10: 109 case 0x12: 110 if ((cpu_feature2 & CPUID2_HV) == 0) 111 wrmsr(0xc0011029, rdmsr(0xc0011029) | 1); 112 break; 113 } 114 } 115 116 /* 117 * Initialize special VIA features 118 */ 119 static void 120 init_via(void) 121 { 122 u_int regs[4], val; 123 124 /* 125 * Check extended CPUID for PadLock features. 126 * 127 * http://www.via.com.tw/en/downloads/whitepapers/initiatives/padlock/programming_guide.pdf 128 */ 129 do_cpuid(0xc0000000, regs); 130 if (regs[0] >= 0xc0000001) { 131 do_cpuid(0xc0000001, regs); 132 val = regs[3]; 133 } else 134 return; 135 136 /* Enable RNG if present. */ 137 if ((val & VIA_CPUID_HAS_RNG) != 0) { 138 via_feature_rng = VIA_HAS_RNG; 139 wrmsr(0x110B, rdmsr(0x110B) | VIA_CPUID_DO_RNG); 140 } 141 142 /* Enable PadLock if present. */ 143 if ((val & VIA_CPUID_HAS_ACE) != 0) 144 via_feature_xcrypt |= VIA_HAS_AES; 145 if ((val & VIA_CPUID_HAS_ACE2) != 0) 146 via_feature_xcrypt |= VIA_HAS_AESCTR; 147 if ((val & VIA_CPUID_HAS_PHE) != 0) 148 via_feature_xcrypt |= VIA_HAS_SHA; 149 if ((val & VIA_CPUID_HAS_PMM) != 0) 150 via_feature_xcrypt |= VIA_HAS_MM; 151 if (via_feature_xcrypt != 0) 152 wrmsr(0x1107, rdmsr(0x1107) | (1 << 28)); 153 } 154 155 /* 156 * Initialize CPU control registers 157 */ 158 void 159 initializecpu(void) 160 { 161 uint64_t msr; 162 uint32_t cr4; 163 164 cr4 = rcr4(); 165 if ((cpu_feature & CPUID_XMM) && (cpu_feature & CPUID_FXSR)) { 166 cr4 |= CR4_FXSR | CR4_XMM; 167 cpu_fxsr = hw_instruction_sse = 1; 168 } 169 if (cpu_stdext_feature & CPUID_STDEXT_FSGSBASE) 170 cr4 |= CR4_FSGSBASE; 171 172 /* 173 * Postpone enabling the SMEP on the boot CPU until the page 174 * tables are switched from the boot loader identity mapping 175 * to the kernel tables. The boot loader enables the U bit in 176 * its tables. 177 */ 178 if (!IS_BSP() && (cpu_stdext_feature & CPUID_STDEXT_SMEP)) 179 cr4 |= CR4_SMEP; 180 load_cr4(cr4); 181 if ((amd_feature & AMDID_NX) != 0) { 182 msr = rdmsr(MSR_EFER) | EFER_NXE; 183 wrmsr(MSR_EFER, msr); 184 pg_nx = PG_NX; 185 } 186 switch (cpu_vendor_id) { 187 case CPU_VENDOR_AMD: 188 init_amd(); 189 break; 190 case CPU_VENDOR_CENTAUR: 191 init_via(); 192 break; 193 } 194 } 195 196 void 197 initializecpucache(void) 198 { 199 200 /* 201 * CPUID with %eax = 1, %ebx returns 202 * Bits 15-8: CLFLUSH line size 203 * (Value * 8 = cache line size in bytes) 204 */ 205 if ((cpu_feature & CPUID_CLFSH) != 0) 206 cpu_clflush_line_size = ((cpu_procinfo >> 8) & 0xff) * 8; 207 /* 208 * XXXKIB: (temporary) hack to work around traps generated 209 * when CLFLUSHing APIC register window under virtualization 210 * environments. These environments tend to disable the 211 * CPUID_SS feature even though the native CPU supports it. 212 */ 213 TUNABLE_INT_FETCH("hw.clflush_disable", &hw_clflush_disable); 214 if (vm_guest != VM_GUEST_NO && hw_clflush_disable == -1) { 215 cpu_feature &= ~CPUID_CLFSH; 216 cpu_stdext_feature &= ~CPUID_STDEXT_CLFLUSHOPT; 217 } 218 219 /* 220 * The kernel's use of CLFLUSH{,OPT} can be disabled manually 221 * by setting the hw.clflush_disable tunable. 222 */ 223 if (hw_clflush_disable == 1) { 224 cpu_feature &= ~CPUID_CLFSH; 225 cpu_stdext_feature &= ~CPUID_STDEXT_CLFLUSHOPT; 226 } 227 } 228