x86/microcode_intel_lib.c: Early update ucode on Intel's CPU
Define interfaces microcode_sanity_check() and get_matching_microcode(). They are called both in early boot time and in microcode Intel driver. Signed-off-by: Fenghua Yu <fenghua.yu@intel.com> Link: http://lkml.kernel.org/r/1356075872-3054-7-git-send-email-fenghua.yu@intel.com Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
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Fenghua Yu
H. Peter Anvin
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/*
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* Intel CPU Microcode Update Driver for Linux
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*
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* Copyright (C) 2012 Fenghua Yu <fenghua.yu@intel.com>
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* H Peter Anvin" <hpa@zytor.com>
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*
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* This driver allows to upgrade microcode on Intel processors
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* belonging to IA-32 family - PentiumPro, Pentium II,
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* Pentium III, Xeon, Pentium 4, etc.
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*
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* Reference: Section 8.11 of Volume 3a, IA-32 Intel? Architecture
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* Software Developer's Manual
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* Order Number 253668 or free download from:
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*
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* http://developer.intel.com/Assets/PDF/manual/253668.pdf
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*
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* For more information, go to http://www.urbanmyth.org/microcode
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*/
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#include <linux/firmware.h>
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#include <linux/uaccess.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <asm/microcode_intel.h>
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#include <asm/processor.h>
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#include <asm/msr.h>
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static inline int
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update_match_cpu(unsigned int csig, unsigned int cpf,
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unsigned int sig, unsigned int pf)
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{
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return (!sigmatch(sig, csig, pf, cpf)) ? 0 : 1;
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}
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int
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update_match_revision(struct microcode_header_intel *mc_header, int rev)
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{
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return (mc_header->rev <= rev) ? 0 : 1;
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}
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int microcode_sanity_check(void *mc, int print_err)
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{
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unsigned long total_size, data_size, ext_table_size;
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struct microcode_header_intel *mc_header = mc;
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struct extended_sigtable *ext_header = NULL;
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int sum, orig_sum, ext_sigcount = 0, i;
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struct extended_signature *ext_sig;
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total_size = get_totalsize(mc_header);
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data_size = get_datasize(mc_header);
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if (data_size + MC_HEADER_SIZE > total_size) {
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if (print_err)
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pr_err("error! Bad data size in microcode data file\n");
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return -EINVAL;
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}
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if (mc_header->ldrver != 1 || mc_header->hdrver != 1) {
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if (print_err)
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pr_err("error! Unknown microcode update format\n");
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return -EINVAL;
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}
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ext_table_size = total_size - (MC_HEADER_SIZE + data_size);
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if (ext_table_size) {
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if ((ext_table_size < EXT_HEADER_SIZE)
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|| ((ext_table_size - EXT_HEADER_SIZE) % EXT_SIGNATURE_SIZE)) {
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if (print_err)
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pr_err("error! Small exttable size in microcode data file\n");
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return -EINVAL;
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}
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ext_header = mc + MC_HEADER_SIZE + data_size;
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if (ext_table_size != exttable_size(ext_header)) {
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if (print_err)
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pr_err("error! Bad exttable size in microcode data file\n");
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return -EFAULT;
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}
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ext_sigcount = ext_header->count;
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}
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/* check extended table checksum */
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if (ext_table_size) {
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int ext_table_sum = 0;
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int *ext_tablep = (int *)ext_header;
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i = ext_table_size / DWSIZE;
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while (i--)
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ext_table_sum += ext_tablep[i];
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if (ext_table_sum) {
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if (print_err)
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pr_warn("aborting, bad extended signature table checksum\n");
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return -EINVAL;
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}
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}
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/* calculate the checksum */
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orig_sum = 0;
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i = (MC_HEADER_SIZE + data_size) / DWSIZE;
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while (i--)
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orig_sum += ((int *)mc)[i];
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if (orig_sum) {
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if (print_err)
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pr_err("aborting, bad checksum\n");
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return -EINVAL;
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}
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if (!ext_table_size)
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return 0;
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/* check extended signature checksum */
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for (i = 0; i < ext_sigcount; i++) {
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ext_sig = (void *)ext_header + EXT_HEADER_SIZE +
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EXT_SIGNATURE_SIZE * i;
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sum = orig_sum
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- (mc_header->sig + mc_header->pf + mc_header->cksum)
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+ (ext_sig->sig + ext_sig->pf + ext_sig->cksum);
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if (sum) {
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if (print_err)
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pr_err("aborting, bad checksum\n");
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return -EINVAL;
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}
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(microcode_sanity_check);
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/*
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* return 0 - no update found
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* return 1 - found update
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*/
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int get_matching_sig(unsigned int csig, int cpf, void *mc, int rev)
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{
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struct microcode_header_intel *mc_header = mc;
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struct extended_sigtable *ext_header;
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unsigned long total_size = get_totalsize(mc_header);
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int ext_sigcount, i;
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struct extended_signature *ext_sig;
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if (update_match_cpu(csig, cpf, mc_header->sig, mc_header->pf))
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return 1;
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/* Look for ext. headers: */
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if (total_size <= get_datasize(mc_header) + MC_HEADER_SIZE)
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return 0;
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ext_header = mc + get_datasize(mc_header) + MC_HEADER_SIZE;
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ext_sigcount = ext_header->count;
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ext_sig = (void *)ext_header + EXT_HEADER_SIZE;
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for (i = 0; i < ext_sigcount; i++) {
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if (update_match_cpu(csig, cpf, ext_sig->sig, ext_sig->pf))
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return 1;
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ext_sig++;
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}
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return 0;
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}
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/*
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* return 0 - no update found
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* return 1 - found update
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*/
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int get_matching_microcode(unsigned int csig, int cpf, void *mc, int rev)
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{
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struct microcode_header_intel *mc_header = mc;
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if (!update_match_revision(mc_header, rev))
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return 0;
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return get_matching_sig(csig, cpf, mc, rev);
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}
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EXPORT_SYMBOL_GPL(get_matching_microcode);
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