1 /* $NetBSD: cpu_ucode_intel.c,v 1.20 2022/09/15 14:34:22 msaitoh Exp $ */ 2 3 /* 4 * Copyright (c) 2012, 2019 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Matthias Drochner and Maxime Villard. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: cpu_ucode_intel.c,v 1.20 2022/09/15 14:34:22 msaitoh Exp $"); 34 35 #ifdef _KERNEL_OPT 36 #include "opt_xen.h" 37 #include "opt_cpu_ucode.h" 38 #endif 39 40 #include <sys/param.h> 41 #include <sys/conf.h> 42 #include <sys/cpuio.h> 43 #include <sys/cpu.h> 44 #include <sys/kmem.h> 45 46 #include <machine/cpufunc.h> 47 #include <machine/specialreg.h> 48 #include <x86/cpu_ucode.h> 49 50 static void 51 intel_getcurrentucode(uint32_t *ucodeversion, int *platformid) 52 { 53 unsigned int unneeded_ids[4]; 54 uint64_t msr; 55 56 kpreempt_disable(); 57 58 wrmsr(MSR_BIOS_SIGN, 0); 59 x86_cpuid(0, unneeded_ids); 60 msr = rdmsr(MSR_BIOS_SIGN); 61 *ucodeversion = msr >> 32; 62 63 kpreempt_enable(); 64 65 msr = rdmsr(MSR_IA32_PLATFORM_ID); 66 *platformid = ((int)(msr >> 50)) & 7; 67 } 68 69 int 70 cpu_ucode_intel_get_version(struct cpu_ucode_version *ucode, 71 void *ptr, size_t len) 72 { 73 struct cpu_info *ci = curcpu(); 74 struct cpu_ucode_version_intel1 *data = ptr; 75 76 if (ucode->loader_version != CPU_UCODE_LOADER_INTEL1 || 77 CPUID_TO_FAMILY(ci->ci_signature) < 6) 78 return EOPNOTSUPP; 79 80 if (len < sizeof(*data)) 81 return ENOSPC; 82 83 intel_getcurrentucode(&data->ucodeversion, &data->platformid); 84 return 0; 85 } 86 87 int 88 cpu_ucode_intel_firmware_open(firmware_handle_t *fwh, const char *fwname) 89 { 90 const char *fw_path = "cpu_x86_intel1"; 91 uint32_t ucodeversion, cpu_signature; 92 char cpuspec[11]; 93 int platformid; 94 95 if (fwname != NULL && fwname[0] != '\0') 96 return firmware_open(fw_path, fwname, fwh); 97 98 cpu_signature = curcpu()->ci_signature; 99 if (CPUID_TO_FAMILY(cpu_signature) < 6) 100 return EOPNOTSUPP; 101 102 intel_getcurrentucode(&ucodeversion, &platformid); 103 snprintf(cpuspec, sizeof(cpuspec), "%08x-%d", cpu_signature, 104 platformid); 105 106 return firmware_open(fw_path, cpuspec, fwh); 107 } 108 109 #ifndef XENPV 110 static int 111 cpu_ucode_intel_verify(struct cpu_ucode_softc *sc, 112 struct intel1_ucode_header *buf) 113 { 114 struct intel1_ucode_ext_table *ehdr; 115 uint32_t data_size, total_size, payload_size, ext_size; 116 uint32_t sum; 117 uint32_t *p; 118 int i; 119 120 if ((buf->uh_header_ver != 1) || (buf->uh_loader_rev != 1)) 121 return EINVAL; 122 123 /* Data size. */ 124 if (buf->uh_data_size == 0) 125 data_size = 2000; 126 else 127 data_size = buf->uh_data_size; 128 if ((data_size % 4) != 0) 129 return EINVAL; 130 if (data_size > sc->sc_blobsize) 131 return EINVAL; 132 133 /* Total size. */ 134 if (buf->uh_total_size == 0) 135 total_size = data_size + 48; 136 else 137 total_size = buf->uh_total_size; 138 if ((total_size % 1024) != 0) 139 return EINVAL; 140 if (total_size > sc->sc_blobsize) 141 return EINVAL; 142 143 /* Payload size. */ 144 payload_size = data_size + 48; 145 if (payload_size > sc->sc_blobsize) 146 return EINVAL; 147 148 /* Verify checksum of update data and header(s). */ 149 sum = 0; 150 p = (uint32_t *)buf; 151 for (i = 0; i < (payload_size / sizeof(uint32_t)); i++) 152 sum += p[i]; 153 if (sum != 0) 154 return EINVAL; 155 156 ext_size = total_size - payload_size; 157 if (ext_size > 0) { 158 /* This image has extended signature table. */ 159 ehdr = (struct intel1_ucode_ext_table *) 160 ((uint8_t *)buf + sizeof(struct intel1_ucode_header) + 161 data_size); 162 payload_size = 163 sizeof(struct intel1_ucode_ext_table) + 164 sizeof(struct intel1_ucode_proc_signature) * 165 ehdr->uet_count; 166 167 sum = 0; 168 p = (uint32_t *)ehdr; 169 for (i = 0; i < (payload_size / sizeof(uint32_t)); i++) 170 sum += p[i]; 171 if (sum != 0) 172 return EINVAL; 173 } 174 175 return 0; 176 } 177 178 int 179 cpu_ucode_intel_apply(struct cpu_ucode_softc *sc, int cpuno) 180 { 181 uint32_t ucodetarget, oucodeversion, nucodeversion; 182 struct intel1_ucode_header *uh; 183 int platformid, cpuid, error; 184 size_t newbufsize = 0; 185 void *uha; 186 187 if (sc->loader_version != CPU_UCODE_LOADER_INTEL1 || 188 cpuno != CPU_UCODE_CURRENT_CPU) 189 return EINVAL; 190 191 uh = (struct intel1_ucode_header *)sc->sc_blob; 192 193 error = cpu_ucode_intel_verify(sc, uh); 194 if (error != 0) 195 return error; 196 197 ucodetarget = uh->uh_rev; 198 199 if (((uintptr_t)sc->sc_blob) & 15) { 200 /* Make the buffer 16 byte aligned. */ 201 newbufsize = sc->sc_blobsize + 15; 202 uha = kmem_alloc(newbufsize, KM_SLEEP); 203 uh = 204 (struct intel1_ucode_header *)roundup2((uintptr_t)uha, 16); 205 memcpy(uh, sc->sc_blob, sc->sc_blobsize); 206 } 207 208 kpreempt_disable(); 209 210 intel_getcurrentucode(&oucodeversion, &platformid); 211 if (oucodeversion >= ucodetarget) { 212 kpreempt_enable(); 213 error = EEXIST; 214 goto out; 215 } 216 217 /* 218 * Perform update. On some platforms a cache invalidation is 219 * required. 220 */ 221 wbinvd(); 222 wrmsr(MSR_BIOS_UPDT_TRIG, (uintptr_t)uh + 48); 223 224 intel_getcurrentucode(&nucodeversion, &platformid); 225 cpuid = curcpu()->ci_index; 226 227 kpreempt_enable(); 228 229 if (nucodeversion != ucodetarget) { 230 error = EIO; 231 goto out; 232 } 233 234 printf("cpu %d: ucode 0x%x->0x%x\n", cpuid, oucodeversion, 235 nucodeversion); 236 237 out: 238 if (newbufsize != 0) 239 kmem_free(uha, newbufsize); 240 return error; 241 } 242 #endif /* ! XEN */ 243
Indexes created Sat Sep 20 22:09:52 GMT 2025