/* $NetBSD: cpu_ucode_intel.c,v 1.12.2.3 2022/10/11 18:07:11 martin Exp $ */ /* * Copyright (c) 2012, 2019 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Matthias Drochner and Maxime Villard. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include __KERNEL_RCSID(0, "$NetBSD: cpu_ucode_intel.c,v 1.12.2.3 2022/10/11 18:07:11 martin Exp $"); #include "opt_xen.h" #include "opt_cpu_ucode.h" #include "opt_compat_netbsd.h" #include #include #include #include #include #include #include #include static void intel_getcurrentucode(uint32_t *ucodeversion, int *platformid) { unsigned int unneeded_ids[4]; uint64_t msr; kpreempt_disable(); wrmsr(MSR_BIOS_SIGN, 0); x86_cpuid(0, unneeded_ids); msr = rdmsr(MSR_BIOS_SIGN); *ucodeversion = msr >> 32; kpreempt_enable(); msr = rdmsr(MSR_IA32_PLATFORM_ID); *platformid = ((int)(msr >> 50)) & 7; } int cpu_ucode_intel_get_version(struct cpu_ucode_version *ucode) { struct cpu_info *ci = curcpu(); struct cpu_ucode_version_intel1 data; if (ucode->loader_version != CPU_UCODE_LOADER_INTEL1 || CPUID_TO_FAMILY(ci->ci_signature) < 6) return EOPNOTSUPP; if (!ucode->data) return 0; intel_getcurrentucode(&data.ucodeversion, &data.platformid); return copyout(&data, ucode->data, sizeof(data)); } int cpu_ucode_intel_firmware_open(firmware_handle_t *fwh, const char *fwname) { const char *fw_path = "cpu_x86_intel1"; uint32_t ucodeversion, cpu_signature; char cpuspec[11]; int platformid; if (fwname != NULL && fwname[0] != '\0') return firmware_open(fw_path, fwname, fwh); cpu_signature = curcpu()->ci_signature; if (CPUID_TO_FAMILY(cpu_signature) < 6) return EOPNOTSUPP; intel_getcurrentucode(&ucodeversion, &platformid); snprintf(cpuspec, sizeof(cpuspec), "%08x-%d", cpu_signature, platformid); return firmware_open(fw_path, cpuspec, fwh); } #ifndef XEN static int cpu_ucode_intel_verify(struct cpu_ucode_softc *sc, struct intel1_ucode_header *buf) { struct intel1_ucode_ext_table *ehdr; uint32_t data_size, total_size, payload_size, ext_size; uint32_t sum; uint32_t *p; int i; if ((buf->uh_header_ver != 1) || (buf->uh_loader_rev != 1)) return EINVAL; /* Data size. */ if (buf->uh_data_size == 0) data_size = 2000; else data_size = buf->uh_data_size; if ((data_size % 4) != 0) return EINVAL; if (data_size > sc->sc_blobsize) return EINVAL; /* Total size. */ if (buf->uh_total_size == 0) total_size = data_size + 48; else total_size = buf->uh_total_size; if ((total_size % 1024) != 0) return EINVAL; if (total_size > sc->sc_blobsize) return EINVAL; /* Payload size. */ payload_size = data_size + 48; if (payload_size > sc->sc_blobsize) return EINVAL; /* Verify checksum of update data and header(s). */ sum = 0; p = (uint32_t *)buf; for (i = 0; i < (payload_size / sizeof(uint32_t)); i++) sum += p[i]; if (sum != 0) return EINVAL; ext_size = total_size - payload_size; if (ext_size > 0) { /* This image has extended signature table. */ ehdr = (struct intel1_ucode_ext_table *) ((uint8_t *)buf + sizeof(struct intel1_ucode_header) + data_size); payload_size = sizeof(struct intel1_ucode_ext_table) + sizeof(struct intel1_ucode_proc_signature) * ehdr->uet_count; sum = 0; p = (uint32_t *)ehdr; for (i = 0; i < (payload_size / sizeof(uint32_t)); i++) sum += p[i]; if (sum != 0) return EINVAL; } return 0; } int cpu_ucode_intel_apply(struct cpu_ucode_softc *sc, int cpuno) { uint32_t ucodetarget, oucodeversion, nucodeversion; struct intel1_ucode_header *uh; int platformid, cpuid, error; size_t newbufsize = 0; void *uha; if (sc->loader_version != CPU_UCODE_LOADER_INTEL1 || cpuno != CPU_UCODE_CURRENT_CPU) return EINVAL; uh = (struct intel1_ucode_header *)sc->sc_blob; error = cpu_ucode_intel_verify(sc, uh); if (error != 0) return error; ucodetarget = uh->uh_rev; if (((uintptr_t)sc->sc_blob) & 15) { /* Make the buffer 16 byte aligned. */ newbufsize = sc->sc_blobsize + 15; uha = kmem_alloc(newbufsize, KM_SLEEP); uh = (struct intel1_ucode_header *)roundup2((uintptr_t)uha, 16); memcpy(uh, sc->sc_blob, sc->sc_blobsize); } kpreempt_disable(); intel_getcurrentucode(&oucodeversion, &platformid); if (oucodeversion >= ucodetarget) { kpreempt_enable(); error = EEXIST; goto out; } /* * Perform update. On some platforms a cache invalidation is * required. */ wbinvd(); wrmsr(MSR_BIOS_UPDT_TRIG, (uintptr_t)uh + 48); intel_getcurrentucode(&nucodeversion, &platformid); cpuid = curcpu()->ci_index; kpreempt_enable(); if (nucodeversion != ucodetarget) { error = EIO; goto out; } printf("cpu %d: ucode 0x%x->0x%x\n", cpuid, oucodeversion, nucodeversion); out: if (newbufsize != 0) kmem_free(uha, newbufsize); return error; } #endif /* ! XEN */