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#!/usr/bin/awk
#
# Convert cpufeatures.h to a list of compile-time masks
# Note: this blithely assumes that each word has at least one
# feature defined in it; if not, something else is wrong!
#
BEGIN {
printf "#ifndef _ASM_X86_CPUFEATUREMASKS_H\n";
printf "#define _ASM_X86_CPUFEATUREMASKS_H\n\n";
file = 0
}
FNR == 1 {
++file;
# arch/x86/include/asm/cpufeatures.h
if (file == 1)
FS = "[ \t()*+]+";
# .config
if (file == 2)
FS = "=";
}
# Create a dictionary of sorts, containing all defined feature bits
file == 1 && $1 ~ /^#define$/ && $2 ~ /^X86_FEATURE_/ {
nfeat = $3 * $4 + $5;
feat = $2;
sub(/^X86_FEATURE_/, "", feat);
feats[nfeat] = feat;
}
file == 1 && $1 ~ /^#define$/ && $2 == "NCAPINTS" {
ncapints = int($3);
}
# Create a dictionary featstat[REQUIRED|DISABLED, FEATURE_NAME] = on | off
file == 2 && $1 ~ /^CONFIG_X86_(REQUIRED|DISABLED)_FEATURE_/ {
on = ($2 == "y");
if (split($1, fs, "CONFIG_X86_|_FEATURE_") == 3)
featstat[fs[2], fs[3]] = on;
}
END {
sets[1] = "REQUIRED";
sets[2] = "DISABLED";
for (ns in sets) {
s = sets[ns];
printf "/*\n";
printf " * %s features:\n", s;
printf " *\n";
fstr = "";
for (i = 0; i < ncapints; i++) {
mask = 0;
for (j = 0; j < 32; j++) {
feat = feats[i*32 + j];
if (featstat[s, feat]) {
nfstr = fstr " " feat;
if (length(nfstr) > 72) {
printf " * %s\n", fstr;
nfstr = " " feat;
}
fstr = nfstr;
mask += (2 ^ j);
}
}
masks[i] = mask;
}
printf " * %s\n */\n", fstr;
for (i = 0; i < ncapints; i++)
printf "#define %s_MASK%d\t0x%08xU\n", s, i, masks[i];
printf "\n#define %s_MASK_BIT_SET(x)\t\t\t\\\n", s;
printf "\t((\t\t\t\t\t";
for (i = 0; i < ncapints; i++) {
if (masks[i])
printf "\t\\\n\t\t((x) >> 5) == %2d ? %s_MASK%d :", i, s, i;
}
printf " 0\t\\\n";
printf "\t) & (1U << ((x) & 31)))\n\n";
}
printf "#endif /* _ASM_X86_CPUFEATUREMASKS_H */\n";
}
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