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    Subject[PATCH v2 04/10] x86/microcode_intel_lib.c: Early update ucode on Intel's CPU
    Date
    From: Fenghua Yu <fenghua.yu@intel.com>

    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>
    ---
    arch/x86/kernel/microcode_intel_lib.c | 174 +++++++++++++++++++++++++++++++++
    1 files changed, 174 insertions(+), 0 deletions(-)
    create mode 100644 arch/x86/kernel/microcode_intel_lib.c

    diff --git a/arch/x86/kernel/microcode_intel_lib.c b/arch/x86/kernel/microcode_intel_lib.c
    new file mode 100644
    index 0000000..ce69320
    --- /dev/null
    +++ b/arch/x86/kernel/microcode_intel_lib.c
    @@ -0,0 +1,174 @@
    +/*
    + * 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 int
    +update_match_cpu(unsigned int csig, unsigned int cpf,
    + unsigned int sig, unsigned int pf)
    +{
    + return (!sigmatch(sig, csig, pf, cpf)) ? 0 : 1;
    +}
    +
    +int
    +update_match_revision(struct microcode_header_intel *mc_header, int rev)
    +{
    + return (mc_header->rev <= rev) ? 0 : 1;
    +}
    +
    +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);
    +
    +/*
    + * return 0 - no update found
    + * return 1 - found update
    + */
    +int get_matching_sig(unsigned int csig, int cpf, void *mc, int rev)
    +{
    + struct microcode_header_intel *mc_header = mc;
    + struct extended_sigtable *ext_header;
    + unsigned long total_size = get_totalsize(mc_header);
    + int ext_sigcount, i;
    + struct extended_signature *ext_sig;
    +
    + if (update_match_cpu(csig, cpf, mc_header->sig, mc_header->pf))
    + return 1;
    +
    + /* Look for ext. headers: */
    + if (total_size <= get_datasize(mc_header) + MC_HEADER_SIZE)
    + return 0;
    +
    + ext_header = mc + get_datasize(mc_header) + MC_HEADER_SIZE;
    + ext_sigcount = ext_header->count;
    + ext_sig = (void *)ext_header + EXT_HEADER_SIZE;
    +
    + for (i = 0; i < ext_sigcount; i++) {
    + if (update_match_cpu(csig, cpf, ext_sig->sig, ext_sig->pf))
    + return 1;
    + ext_sig++;
    + }
    + return 0;
    +}
    +
    +/*
    + * return 0 - no update found
    + * return 1 - found update
    + */
    +int get_matching_microcode(unsigned int csig, int cpf, void *mc, int rev)
    +{
    + struct microcode_header_intel *mc_header = mc;
    +
    + if (!update_match_revision(mc_header, rev))
    + return 0;
    +
    + return get_matching_sig(csig, cpf, mc, rev);
    +}
    +EXPORT_SYMBOL_GPL(get_matching_microcode);
    --
    1.7.2


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