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198 lines
6.7 KiB
198 lines
6.7 KiB
2 years ago
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#! /bin/bash -efu
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# Generator of RPM "Provides:" tags for Intel microcode files.
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#
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# SPDX-License-Identifier: CC0-1.0
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IFS=$'\n'
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UPDATED="intel-beta"
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CODENAMES="codenames"
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if [ "$#" -ge 1 ]; then
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CODENAMES="$1"
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shift
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fi
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# Match only FF-MM-SS ucode files under intel-ucode/intel-ucode-with-caveats
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# directories.
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for f in $(grep -E '/intel-ucode.*/[0-9a-f][0-9a-f]-[0-9a-f][0-9a-f]-[0-9a-f][0-9a-f]$'); do
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ucode=$(basename "$f")
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ucode_caveat="$(basename "$(dirname "$(dirname "$f")")")"
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ucode_fname="$ucode_caveat/$ucode"
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file_sz="$(stat -c "%s" "$f")"
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skip=0
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ext_hdr=0
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ext_sig_cnt=0
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ext_sig_pos=0
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next_skip=0
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# Microcode header format description:
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# https://gitlab.com/iucode-tool/iucode-tool/blob/master/intel_microcode.c
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while :; do
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[ "$skip" -lt "$file_sz" ] || break
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# Do we parse ext_sig table or another microcode header?
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if [ 0 != "$next_skip" ]; then
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# Check whether we should abort ext_sig table parsing
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[ \( "${skip}" -lt "${next_skip}" \) -a \
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\( "${ext_sig_pos}" -lt "${ext_sig_cnt}" \) ] || {
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skip="${next_skip}"
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next_skip=0
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continue
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}
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# ext_sig, 12 bytes in size
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IFS=' ' read cpuid pf_mask <<- EOF
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$(dd if="$f" ibs=1 skip="$skip" count=8 status=none \
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| xxd -e -g4 | xxd -r | hexdump -n 8 \
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-e '"" 4/1 "%02x" " 0x" 4/1 "%02x" "\n"')
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EOF
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# Converting values from the constructed %#08x format
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pf_mask="$((pf_mask))"
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skip="$((skip + 12))"
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ext_sig_pos="$((ext_sig_pos + 1))"
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else
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# Microcode header, 48 bytes, last 3 fields reserved
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# cksum, ldrver are ignored
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IFS=' ' read hdrver rev \
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date_m date_d date_y \
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cpuid cksum ldrver \
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pf_mask datasz totalsz <<- EOF
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$(dd if="$f" ibs=1 skip="$skip" count=36 status=none \
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| xxd -e -g4 | xxd -r | hexdump -n 36 \
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-e '"0x" 4/1 "%02x" " 0x" 4/1 "%02x" " " \
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1/1 "%02x " 1/1 "%02x " 2/1 "%02x" " " \
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4/1 "%02x" " 0x" 4/1 "%02x" " 0x" 4/1 "%02x" \
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" 0x" 4/1 "%x" \
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" 0x" 4/1 "%02x" " 0x" 4/1 "%02x" "\n"')
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EOF
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# Converting values from the constructed %#08x format
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rev="$(printf '%#x' "$((rev))")"
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pf_mask="$((pf_mask))"
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datasz="$((datasz))"
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totalsz="$((totalsz))"
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# Skipping files with unexpected hdrver value
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[ 1 = "$((hdrver))" ] || {
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echo "$f+$skip@$file_sz: incorrect hdrver $((hdrver))" >&2
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break
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}
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[ 0 != "$datasz" ] || datasz=2000
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[ 0 != "$totalsz" ] || totalsz=2048
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# TODO: add some sanity/safety checks here. As of now,
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# there's a (pretty fragile) assumption that all
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# the matched files are valid Intel microcode
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# files in the expected format.
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# ext_sig table is after the microcode payload,
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# check for its presence
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if [ 48 -lt "$((totalsz - datasz))" ]; then
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next_skip="$((skip + totalsz))"
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skip="$((skip + datasz + 48))"
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ext_sig_pos=0
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# ext_sig table header, 20 bytes in size,
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# last 3 fields are reserved.
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IFS=' ' read ext_sig_cnt <<- EOF
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$(dd if="$f" ibs=1 skip="$skip" count=4 status=none \
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| xxd -e -g4 | hexdump -n 4 \
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-e '"0x" 4/1 "%02x" "\n"')
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EOF
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# Converting values from the constructed format
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ext_sig_cnt="$((ext_sig_cnt))"
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skip="$((skip + 20))"
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else
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skip="$((skip + totalsz))"
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next_skip=0
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fi
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fi
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#[ -n "$rev" ] || continue
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# Basic "Provides:" tag. Everything else is bells and whistles.
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# It's possible that microcode files for different platform_id's
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# and the same CPUID have the same version, that's why "sort -u"
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# in the end.
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printf "firmware(intel-ucode/%s) = %s\n" "$ucode" "$rev"
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# Generate extended "Provides:" tags with additional
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# information, which allow more precise matching.
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printf "iucode_date(fname:%s;cpuid:%s;pf_mask:0x%x) = %s.%s.%s\n" \
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"$ucode_fname" "$cpuid" "$pf_mask" "$date_y" "$date_m" "$date_d"
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printf "iucode_rev(fname:%s;cpuid:%s;pf_mask:0x%x) = %s\n" \
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"$ucode_fname" "$cpuid" "$pf_mask" "$rev"
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# Generate tags for each possible platform_id
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_pf=1
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_pf_mask="$pf_mask"
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while [ 0 -lt "$_pf_mask" ]; do
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[ 1 -ne "$((_pf_mask % 2))" ] || \
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# We try to provide a more specific firmware()
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# dependency here. It has incorrect file name,
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# but allows constructing a required RPM
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# capability name by (directly) using
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# the contents of /proc/cpuinfo and
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# /sys/devices/system/cpu/cpu*/microcode/processor_flags
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# (except for a Deschutes CPU with sig 0x1632)
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printf "iucode_rev(fname:%s;platform_id:0x%x) = %s\n" \
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"$ucode_fname" "$_pf" "$rev"
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_pf_mask=$((_pf_mask / 2))
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_pf=$((_pf * 2))
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done
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# Generate tags with codename information, in case
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# it is available
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if [ -e "$CODENAMES" ]; then
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cpuid_up="$(echo "$cpuid" | tr 'a-z' 'A-Z')"
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cpuid_short="$(printf "%x" "0x$cpuid")"
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(grep ' '"$cpuid_up"' ' "$CODENAMES" || :; grep ';'"$cpuid_short"';' "$CODENAMES" || :) \
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| while IFS=$';\t' read segm int_fname codename stepping candidate_pf cpuid_cn cname variants rest; do
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[ "x${segm###}" = "x$segm" ] || continue
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[ -n "${segm}" ] || continue
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codename=$(echo "$codename" | tr ' (),' '_[];')
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candidate_pf=$(printf "%u" "0x${candidate_pf}")
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(IFS=','; for s in $stepping; do
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[ \( 0 -ne "$pf_mask" \) -a \
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\( 0 -eq "$((candidate_pf & pf_mask))" \) ] || { \
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printf "iucode_rev(fname:%s;cpuid:%s;pf_mask:0x%x;segment:\"%s\";codename:\"%s\";stepping:\"%s\";pf_model:0x%x) = %s\n" \
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"$ucode_fname" "$cpuid" "$pf_mask" \
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"$segm" "$codename" "$s" "$candidate_pf" \
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"$rev";
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printf "iucode_date(fname:%s;cpuid:%s;pf_mask:0x%x;segment:\"%s\";codename:\"%s\";stepping:\"%s\";pf_model:0x%x) = %s.%s.%s\n" \
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"$ucode_fname" "$cpuid" "$pf_mask" \
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"$segm" "$codename" "$s" "$candidate_pf" \
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"$date_y" "$date_m" "$date_d";
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if [ "$cpuid_short" = "$cpuid_cn" -a -n "$variants" ]; then
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(IFS=','; for v in $variants; do
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v=$(echo "$v" | tr ' (),' '_[];')
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printf "iucode_rev(fname:%s;cpuid:%s;pf_mask:0x%x;segment:\"%s\";codename:\"%s_%s\";stepping:\"%s\";pf_model:0x%x) = %s\n" \
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"$ucode_fname" "$cpuid" "$pf_mask" \
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"$segm" "$codename" "$v" "$s" "$candidate_pf" \
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"$rev";
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printf "iucode_date(fname:%s;cpuid:%s;pf_mask:0x%x;segment:\"%s\";codename:\"%s_%s\";stepping:\"%s\";pf_model:0x%x) = %s.%s.%s\n" \
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"$ucode_fname" "$cpuid" "$pf_mask" \
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"$segm" "$codename" "$v" "$s" "$candidate_pf" \
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"$date_y" "$date_m" "$date_d";
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done)
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fi
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}
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done)
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done
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fi
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# Kludge squared: generate additional "Provides:" tags
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# for the files in the overrides tarball (that a placed
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# in a separate caveat with a specific name)
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[ "x${ucode_caveat}" != "x${UPDATED}" ] || {
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printf "firmware_updated(intel-ucode/%s) = %s\n" \
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"$ucode" "$rev";
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}
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done
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done | sort -u
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