Blame SPECS/gen_provides.sh

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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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			$(hexdump -s "$skip" -n 8 \
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				-e '"" 1/4 "%08x " 1/4 "%u" "\n"' "$f")
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			EOF
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			skip="$((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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			IFS=' ' read hdrver rev \
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			       date_y date_d date_m \
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			       cpuid cksum ldrver \
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			       pf_mask datasz totalsz <<- EOF
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			$(hexdump -s "$skip" -n 36 \
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				-e '"" 1/4 "%u " 1/4 "%#x " \
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			               1/2 "%04x " 1/1 "%02x " 1/1 "%02x " \
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				       1/4 "%08x " 1/4 "%x " 1/4 "%#x " \
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				       1/4 "%u " 1/4 "%u " 1/4 "%u" "\n"' "$f")
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			EOF
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			[ 0 != "$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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				$(hexdump -s "$skip" -n 4 \
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					-e '"" 1/4 "%u" "\n"' "$f")
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				EOF
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				skip="$((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