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/* * Intel CPU Microcode Update Driver for Linux * * Copyright (C) 2012 Fenghua Yu <fenghua.yu@intel.com> * H Peter Anvin" <hpa@zytor.com> * * This driver allows to upgrade microcode on Intel processors * belonging to IA-32 family - PentiumPro, Pentium II, * Pentium III, Xeon, Pentium 4, etc. * * Reference: Section 8.11 of Volume 3a, IA-32 Intel? Architecture * Software Developer's Manual * Order Number 253668 or free download from: * * http://developer.intel.com/Assets/PDF/manual/253668.pdf * * For more information, go to http://www.urbanmyth.org/microcode * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * */ #include <linux/firmware.h> #include <linux/uaccess.h> #include <linux/kernel.h> #include <linux/module.h> #include <asm/microcode_intel.h> #include <asm/processor.h> #include <asm/msr.h> static inline bool cpu_signatures_match(unsigned int s1, unsigned int p1, unsigned int s2, unsigned int p2) { if (s1 != s2) return false; /* Processor flags are either both 0 ... */ if (!p1 && !p2) return true; /* ... or they intersect. */ return p1 & p2; } int microcode_sanity_check(void *mc, int print_err) { unsigned long total_size, data_size, ext_table_size; struct microcode_header_intel *mc_header = mc; struct extended_sigtable *ext_header = NULL; int sum, orig_sum, ext_sigcount = 0, i; struct extended_signature *ext_sig; total_size = get_totalsize(mc_header); data_size = get_datasize(mc_header); if (data_size + MC_HEADER_SIZE > total_size) { if (print_err) pr_err("error! Bad data size in microcode data file\n"); return -EINVAL; } if (mc_header->ldrver != 1 || mc_header->hdrver != 1) { if (print_err) pr_err("error! Unknown microcode update format\n"); return -EINVAL; } ext_table_size = total_size - (MC_HEADER_SIZE + data_size); if (ext_table_size) { if ((ext_table_size < EXT_HEADER_SIZE) || ((ext_table_size - EXT_HEADER_SIZE) % EXT_SIGNATURE_SIZE)) { if (print_err) pr_err("error! Small exttable size in microcode data file\n"); return -EINVAL; } ext_header = mc + MC_HEADER_SIZE + data_size; if (ext_table_size != exttable_size(ext_header)) { if (print_err) pr_err("error! Bad exttable size in microcode data file\n"); return -EFAULT; } ext_sigcount = ext_header->count; } /* check extended table checksum */ if (ext_table_size) { int ext_table_sum = 0; int *ext_tablep = (int *)ext_header; i = ext_table_size / DWSIZE; while (i--) ext_table_sum += ext_tablep[i]; if (ext_table_sum) { if (print_err) pr_warn("aborting, bad extended signature table checksum\n"); return -EINVAL; } } /* calculate the checksum */ orig_sum = 0; i = (MC_HEADER_SIZE + data_size) / DWSIZE; while (i--) orig_sum += ((int *)mc)[i]; if (orig_sum) { if (print_err) pr_err("aborting, bad checksum\n"); return -EINVAL; } if (!ext_table_size) return 0; /* check extended signature checksum */ for (i = 0; i < ext_sigcount; i++) { ext_sig = (void *)ext_header + EXT_HEADER_SIZE + EXT_SIGNATURE_SIZE * i; sum = orig_sum - (mc_header->sig + mc_header->pf + mc_header->cksum) + (ext_sig->sig + ext_sig->pf + ext_sig->cksum); if (sum) { if (print_err) pr_err("aborting, bad checksum\n"); return -EINVAL; } } return 0; } EXPORT_SYMBOL_GPL(microcode_sanity_check); /* * Returns 1 if update has been found, 0 otherwise. */ int find_matching_signature(void *mc, unsigned int csig, int cpf) { struct microcode_header_intel *mc_hdr = mc; struct extended_sigtable *ext_hdr; struct extended_signature *ext_sig; int i; if (cpu_signatures_match(csig, cpf, mc_hdr->sig, mc_hdr->pf)) return 1; /* Look for ext. headers: */ if (get_totalsize(mc_hdr) <= get_datasize(mc_hdr) + MC_HEADER_SIZE) return 0; ext_hdr = mc + get_datasize(mc_hdr) + MC_HEADER_SIZE; ext_sig = (void *)ext_hdr + EXT_HEADER_SIZE; for (i = 0; i < ext_hdr->count; i++) { if (cpu_signatures_match(csig, cpf, ext_sig->sig, ext_sig->pf)) return 1; ext_sig++; } return 0; } /* * Returns 1 if update has been found, 0 otherwise. */ int has_newer_microcode(void *mc, unsigned int csig, int cpf, int new_rev) { struct microcode_header_intel *mc_hdr = mc; if (mc_hdr->rev <= new_rev) return 0; return find_matching_signature(mc, csig, cpf); } EXPORT_SYMBOL_GPL(has_newer_microcode);
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