Root/scripts/headers_install.pl

Source at commit cdde9cf73945d547acd3e96f9508c79e84ad0bf1 created 9 years 4 months ago.
By Maarten ter Huurne, MMC: JZ4740: Added support for CPU frequency changing
1#!/usr/bin/perl -w
2#
3# headers_install prepare the listed header files for use in
4# user space and copy the files to their destination.
5#
6# Usage: headers_install.pl readdir installdir arch [files...]
7# readdir: dir to open files
8# installdir: dir to install the files
9# arch: current architecture
10# arch is used to force a reinstallation when the arch
11# changes because kbuild then detect a command line change.
12# files: list of files to check
13#
14# Step in preparation for users space:
15# 1) Drop all use of compiler.h definitions
16# 2) Drop include of compiler.h
17# 3) Drop all sections defined out by __KERNEL__ (using unifdef)
18
19use strict;
20
21my ($readdir, $installdir, $arch, @files) = @ARGV;
22
23my $unifdef = "scripts/unifdef -U__KERNEL__ -D__EXPORTED_HEADERS__";
24
25foreach my $file (@files) {
26    my $tmpfile = "$installdir/$file.tmp";
27
28    open(my $in, '<', "$readdir/$file")
29        or die "$readdir/$file: $!\n";
30    open(my $out, '>', $tmpfile)
31        or die "$tmpfile: $!\n";
32    while (my $line = <$in>) {
33        $line =~ s/([\s(])__user\s/$1/g;
34        $line =~ s/([\s(])__force\s/$1/g;
35        $line =~ s/([\s(])__iomem\s/$1/g;
36        $line =~ s/\s__attribute_const__\s/ /g;
37        $line =~ s/\s__attribute_const__$//g;
38        $line =~ s/\b__packed\b/__attribute__((packed))/g;
39        $line =~ s/^#include <linux\/compiler.h>//;
40        $line =~ s/(^|\s)(inline)\b/$1__$2__/g;
41        $line =~ s/(^|\s)(asm)\b(\s|[(]|$)/$1__$2__$3/g;
42        $line =~ s/(^|\s|[(])(volatile)\b(\s|[(]|$)/$1__$2__$3/g;
43        printf {$out} "%s", $line;
44    }
45    close $out;
46    close $in;
47
48    system $unifdef . " $tmpfile > $installdir/$file";
49    # unifdef will exit 0 on success, and will exit 1 when the
50    # file was processed successfully but no changes were made,
51    # so abort only when it's higher than that.
52    my $e = $? >> 8;
53    if ($e > 1) {
54        die "$tmpfile: $!\n";
55    }
56    unlink $tmpfile;
57}
58exit 0;
59

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