| 1 | /* $NetBSD: cpu_ucode_intel.c,v 1.11 2016/11/21 04:10:05 ozaki-r Exp $ */ |
| 2 | /* |
| 3 | * Copyright (c) 2012 The NetBSD Foundation, Inc. |
| 4 | * All rights reserved. |
| 5 | * |
| 6 | * This code is derived from software contributed to The NetBSD Foundation |
| 7 | * by Matthias Drochner. |
| 8 | * |
| 9 | * Redistribution and use in source and binary forms, with or without |
| 10 | * modification, are permitted provided that the following conditions |
| 11 | * are met: |
| 12 | * 1. Redistributions of source code must retain the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer. |
| 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
| 19 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 20 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 21 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
| 22 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 23 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 24 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 25 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 26 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 27 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 28 | * POSSIBILITY OF SUCH DAMAGE. |
| 29 | */ |
| 30 | |
| 31 | #include <sys/cdefs.h> |
| 32 | __KERNEL_RCSID(0, "$NetBSD: cpu_ucode_intel.c,v 1.11 2016/11/21 04:10:05 ozaki-r Exp $" ); |
| 33 | |
| 34 | #include "opt_xen.h" |
| 35 | #include "opt_cpu_ucode.h" |
| 36 | #include "opt_compat_netbsd.h" |
| 37 | |
| 38 | #include <sys/param.h> |
| 39 | #include <sys/conf.h> |
| 40 | #include <sys/cpuio.h> |
| 41 | #include <sys/cpu.h> |
| 42 | #include <sys/kmem.h> |
| 43 | |
| 44 | #include <machine/cpufunc.h> |
| 45 | #include <machine/specialreg.h> |
| 46 | #include <x86/cpu_ucode.h> |
| 47 | |
| 48 | static void |
| 49 | intel_getcurrentucode(uint32_t *ucodeversion, int *platformid) |
| 50 | { |
| 51 | unsigned int unneeded_ids[4]; |
| 52 | uint64_t msr; |
| 53 | |
| 54 | kpreempt_disable(); |
| 55 | |
| 56 | wrmsr(MSR_BIOS_SIGN, 0); |
| 57 | x86_cpuid(0, unneeded_ids); |
| 58 | msr = rdmsr(MSR_BIOS_SIGN); |
| 59 | *ucodeversion = msr >> 32; |
| 60 | |
| 61 | kpreempt_enable(); |
| 62 | |
| 63 | msr = rdmsr(MSR_IA32_PLATFORM_ID); |
| 64 | *platformid = ((int)(msr >> 50)) & 7; |
| 65 | } |
| 66 | |
| 67 | int |
| 68 | cpu_ucode_intel_get_version(struct cpu_ucode_version *ucode) |
| 69 | { |
| 70 | struct cpu_info *ci = curcpu(); |
| 71 | struct cpu_ucode_version_intel1 data; |
| 72 | |
| 73 | if (ucode->loader_version != CPU_UCODE_LOADER_INTEL1 || |
| 74 | CPUID_TO_FAMILY(ci->ci_signature) < 6) |
| 75 | return EOPNOTSUPP; |
| 76 | if (!ucode->data) |
| 77 | return 0; |
| 78 | |
| 79 | intel_getcurrentucode(&data.ucodeversion, &data.platformid); |
| 80 | |
| 81 | return copyout(&data, ucode->data, sizeof(data)); |
| 82 | } |
| 83 | |
| 84 | int |
| 85 | cpu_ucode_intel_firmware_open(firmware_handle_t *fwh, const char *fwname) |
| 86 | { |
| 87 | const char *fw_path = "cpu_x86_intel1" ; |
| 88 | uint32_t ucodeversion, cpu_signature; |
| 89 | int platformid; |
| 90 | char cpuspec[11]; |
| 91 | |
| 92 | if (fwname != NULL && fwname[0] != '\0') |
| 93 | return firmware_open(fw_path, fwname, fwh); |
| 94 | |
| 95 | cpu_signature = curcpu()->ci_signature; |
| 96 | if (CPUID_TO_FAMILY(cpu_signature) < 6) |
| 97 | return EOPNOTSUPP; |
| 98 | |
| 99 | intel_getcurrentucode(&ucodeversion, &platformid); |
| 100 | snprintf(cpuspec, sizeof(cpuspec), "%08x-%d" , cpu_signature, |
| 101 | platformid); |
| 102 | |
| 103 | return firmware_open(fw_path, cpuspec, fwh); |
| 104 | } |
| 105 | |
| 106 | #ifndef XEN |
| 107 | int |
| 108 | cpu_ucode_intel_apply(struct cpu_ucode_softc *sc, int cpuno) |
| 109 | { |
| 110 | uint32_t ucodetarget, oucodeversion, nucodeversion; |
| 111 | int platformid, cpuid; |
| 112 | struct intel1_ucode_header *uh; |
| 113 | void *uha; |
| 114 | size_t newbufsize = 0; |
| 115 | int rv = 0; |
| 116 | |
| 117 | if (sc->loader_version != CPU_UCODE_LOADER_INTEL1 |
| 118 | || cpuno != CPU_UCODE_CURRENT_CPU) |
| 119 | return EINVAL; |
| 120 | |
| 121 | uh = (struct intel1_ucode_header *)(sc->sc_blob); |
| 122 | if (uh->uh_header_ver != 1 || uh->uh_loader_rev != 1) |
| 123 | return EINVAL; |
| 124 | ucodetarget = uh->uh_rev; |
| 125 | |
| 126 | if ((uintptr_t)(sc->sc_blob) & 15) { |
| 127 | /* Make the buffer 16 byte aligned */ |
| 128 | newbufsize = sc->sc_blobsize + 15; |
| 129 | uha = kmem_alloc(newbufsize, KM_SLEEP); |
| 130 | if (uha == NULL) { |
| 131 | printf("%s: memory allocation failed\n" , __func__); |
| 132 | return EINVAL; |
| 133 | } |
| 134 | uh = (struct intel1_ucode_header *)roundup2((uintptr_t)uha, 16); |
| 135 | /* Copy to the new area */ |
| 136 | memcpy(uh, sc->sc_blob, sc->sc_blobsize); |
| 137 | } |
| 138 | |
| 139 | kpreempt_disable(); |
| 140 | |
| 141 | intel_getcurrentucode(&oucodeversion, &platformid); |
| 142 | if (oucodeversion >= ucodetarget) { |
| 143 | kpreempt_enable(); |
| 144 | rv = EEXIST; /* ??? */ |
| 145 | goto out; |
| 146 | } |
| 147 | wrmsr(MSR_BIOS_UPDT_TRIG, (uintptr_t)uh + 48); |
| 148 | intel_getcurrentucode(&nucodeversion, &platformid); |
| 149 | cpuid = curcpu()->ci_index; |
| 150 | |
| 151 | kpreempt_enable(); |
| 152 | |
| 153 | if (nucodeversion != ucodetarget) { |
| 154 | rv = EIO; |
| 155 | goto out; |
| 156 | } |
| 157 | |
| 158 | printf("cpu %d: ucode 0x%x->0x%x\n" , cpuid, |
| 159 | oucodeversion, nucodeversion); |
| 160 | out: |
| 161 | if (newbufsize != 0) |
| 162 | kmem_free(uha, newbufsize); |
| 163 | return rv; |
| 164 | } |
| 165 | #endif /* ! XEN */ |
| 166 | |