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462 lines
10 KiB
Diff
462 lines
10 KiB
Diff
From 35361c41437a4d81c47bc56189369201c5f1d2e4 Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.org>
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Date: Mon, 11 May 2015 09:00:42 +0100
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Subject: [PATCH 049/304] scripts: Add mkknlimg and knlinfo scripts from tools
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repo
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The Raspberry Pi firmware looks for a trailer on the kernel image to
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determine whether it was compiled with Device Tree support enabled.
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If the firmware finds a kernel without this trailer, or which has a
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trailer indicating that it isn't DT-capable, it disables DT support
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and reverts to using ATAGs.
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The mkknlimg utility adds that trailer, having first analysed the
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image to look for signs of DT support and the kernel version string.
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knlinfo displays the contents of the trailer in the given kernel image.
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scripts/mkknlimg: Add support for ARCH_BCM2835
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Add a new trailer field indicating whether this is an ARCH_BCM2835
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build, as opposed to MACH_BCM2708/9. If the loader finds this flag
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is set it changes the default base dtb file name from bcm270x...
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to bcm283y...
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Also update knlinfo to show the status of the field.
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scripts/mkknlimg: Improve ARCH_BCM2835 detection
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The board support code contains sufficient strings to be able to
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distinguish 2708 vs. 2835 builds, so remove the check for
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bcm2835-pm-wdt which could exist in either.
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Also, since the canned configuration is no longer built in (it's
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a module), remove the config string checking.
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See: https://github.com/raspberrypi/linux/issues/1157
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---
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scripts/knlinfo | 168 ++++++++++++++++++++++++++++++++++++++
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scripts/mkknlimg | 244 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
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2 files changed, 412 insertions(+)
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create mode 100755 scripts/knlinfo
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create mode 100755 scripts/mkknlimg
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--- /dev/null
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+++ b/scripts/knlinfo
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@@ -0,0 +1,168 @@
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+#!/usr/bin/env perl
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+# ----------------------------------------------------------------------
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+# knlinfo by Phil Elwell for Raspberry Pi
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+#
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+# (c) 2014,2015 Raspberry Pi (Trading) Limited <info@raspberrypi.org>
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+#
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+# Licensed under the terms of the GNU General Public License.
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+# ----------------------------------------------------------------------
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+
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+use strict;
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+use integer;
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+
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+use Fcntl ":seek";
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+
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+my $trailer_magic = 'RPTL';
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+
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+my %atom_formats =
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+(
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+ 'DTOK' => \&format_bool,
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+ 'KVer' => \&format_string,
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+ '283x' => \&format_bool,
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+);
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+
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+if (@ARGV != 1)
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+{
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+ print ("Usage: knlinfo <kernel image>\n");
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+ exit(1);
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+}
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+
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+my $kernel_file = $ARGV[0];
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+
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+
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+my ($atoms, $pos) = read_trailer($kernel_file);
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+
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+exit(1) if (!$atoms);
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+
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+printf("Kernel trailer found at %d/0x%x:\n", $pos, $pos);
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+
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+foreach my $atom (@$atoms)
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+{
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+ printf(" %s: %s\n", $atom->[0], format_atom($atom));
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+}
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+
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+exit(0);
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+
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+sub read_trailer
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+{
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+ my ($kernel_file) = @_;
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+ my $fh;
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+
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+ if (!open($fh, '<', $kernel_file))
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+ {
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+ print ("* Failed to open '$kernel_file'\n");
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+ return undef;
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+ }
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+
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+ if (!seek($fh, -12, SEEK_END))
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+ {
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+ print ("* seek error in '$kernel_file'\n");
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+ return undef;
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+ }
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+
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+ my $last_bytes;
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+ sysread($fh, $last_bytes, 12);
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+
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+ my ($trailer_len, $data_len, $magic) = unpack('VVa4', $last_bytes);
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+
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+ if (($magic ne $trailer_magic) || ($data_len != 4))
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+ {
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+ print ("* no trailer\n");
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+ return undef;
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+ }
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+ if (!seek($fh, -12, SEEK_END))
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+ {
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+ print ("* seek error in '$kernel_file'\n");
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+ return undef;
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+ }
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+
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+ $trailer_len -= 12;
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+
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+ while ($trailer_len > 0)
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+ {
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+ if ($trailer_len < 8)
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+ {
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+ print ("* truncated atom header in trailer\n");
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+ return undef;
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+ }
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+ if (!seek($fh, -8, SEEK_CUR))
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+ {
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+ print ("* seek error in '$kernel_file'\n");
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+ return undef;
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+ }
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+ $trailer_len -= 8;
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+
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+ my $atom_hdr;
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+ sysread($fh, $atom_hdr, 8);
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+ my ($atom_len, $atom_type) = unpack('Va4', $atom_hdr);
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+
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+ if ($trailer_len < $atom_len)
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+ {
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+ print ("* truncated atom data in trailer\n");
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+ return undef;
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+ }
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+
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+ my $rounded_len = (($atom_len + 3) & ~3);
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+ if (!seek($fh, -(8 + $rounded_len), SEEK_CUR))
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+ {
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+ print ("* seek error in '$kernel_file'\n");
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+ return undef;
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+ }
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+ $trailer_len -= $rounded_len;
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+
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+ my $atom_data;
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+ sysread($fh, $atom_data, $atom_len);
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+
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+ if (!seek($fh, -$atom_len, SEEK_CUR))
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+ {
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+ print ("* seek error in '$kernel_file'\n");
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+ return undef;
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+ }
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+
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+ push @$atoms, [ $atom_type, $atom_data ];
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+ }
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+
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+ if (($$atoms[-1][0] eq "\x00\x00\x00\x00") &&
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+ ($$atoms[-1][1] eq ""))
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+ {
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+ pop @$atoms;
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+ }
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+ else
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+ {
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+ print ("* end marker missing from trailer\n");
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+ }
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+
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+ return ($atoms, tell($fh));
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+}
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+
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+sub format_atom
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+{
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+ my ($atom) = @_;
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+
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+ my $format_func = $atom_formats{$atom->[0]} || \&format_hex;
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+ return $format_func->($atom->[1]);
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+}
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+
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+sub format_bool
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+{
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+ my ($data) = @_;
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+ return unpack('V', $data) ? 'true' : 'false';
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+}
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+
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+sub format_int
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+{
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+ my ($data) = @_;
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+ return unpack('V', $data);
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+}
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+
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+sub format_string
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+{
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+ my ($data) = @_;
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+ return '"'.$data.'"';
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+}
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+
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+sub format_hex
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+{
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+ my ($data) = @_;
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+ return unpack('H*', $data);
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+}
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--- /dev/null
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+++ b/scripts/mkknlimg
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@@ -0,0 +1,244 @@
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+#!/usr/bin/env perl
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+# ----------------------------------------------------------------------
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+# mkknlimg by Phil Elwell for Raspberry Pi
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+# based on extract-ikconfig by Dick Streefland
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+#
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+# (c) 2009,2010 Dick Streefland <dick@streefland.net>
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+# (c) 2014,2015 Raspberry Pi (Trading) Limited <info@raspberrypi.org>
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+#
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+# Licensed under the terms of the GNU General Public License.
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+# ----------------------------------------------------------------------
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+
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+use strict;
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+use warnings;
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+use integer;
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+
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+my $trailer_magic = 'RPTL';
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+
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+my $tmpfile1 = "/tmp/mkknlimg_$$.1";
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+my $tmpfile2 = "/tmp/mkknlimg_$$.2";
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+
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+my $dtok = 0;
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+my $is_283x = 0;
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+
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+while (@ARGV && ($ARGV[0] =~ /^-/))
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+{
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+ my $arg = shift(@ARGV);
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+ if ($arg eq '--dtok')
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+ {
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+ $dtok = 1;
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+ }
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+ elsif ($arg eq '--283x')
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+ {
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+ $is_283x = 1;
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+ }
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+ else
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+ {
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+ print ("* Unknown option '$arg'\n");
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+ usage();
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+ }
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+}
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+
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+usage() if (@ARGV != 2);
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+
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+my $kernel_file = $ARGV[0];
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+my $out_file = $ARGV[1];
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+
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+if (! -r $kernel_file)
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+{
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+ print ("* File '$kernel_file' not found\n");
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+ usage();
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+}
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+
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+my @wanted_strings =
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+(
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+ 'bcm2708_fb',
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+ 'brcm,bcm2835-mmc',
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+ 'brcm,bcm2835-sdhost',
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+ 'brcm,bcm2708-pinctrl',
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+ 'brcm,bcm2835-gpio',
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+ 'brcm,bcm2835',
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+ 'brcm,bcm2836'
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+);
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+
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+my $res = try_extract($kernel_file, $tmpfile1);
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+$res = try_decompress('\037\213\010', 'xy', 'gunzip', 0,
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+ $kernel_file, $tmpfile1, $tmpfile2) if (!$res);
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+$res = try_decompress('\3757zXZ\000', 'abcde', 'unxz --single-stream', -1,
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+ $kernel_file, $tmpfile1, $tmpfile2) if (!$res);
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+$res = try_decompress('BZh', 'xy', 'bunzip2', 0,
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+ $kernel_file, $tmpfile1, $tmpfile2) if (!$res);
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+$res = try_decompress('\135\0\0\0', 'xxx', 'unlzma', 0,
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+ $kernel_file, $tmpfile1, $tmpfile2) if (!$res);
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+$res = try_decompress('\211\114\132', 'xy', 'lzop -d', 0,
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+ $kernel_file, $tmpfile1, $tmpfile2) if (!$res);
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+$res = try_decompress('\002\041\114\030', 'xy', 'lz4 -d', 1,
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+ $kernel_file, $tmpfile1, $tmpfile2) if (!$res);
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+
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+my $append_trailer;
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+my $trailer;
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+my $kver = '?';
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+
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+$append_trailer = $dtok;
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+
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+if ($res)
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+{
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+ $kver = $res->{''} || '?';
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+ print("Version: $kver\n");
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+
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+ $append_trailer = $dtok;
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+ if (!$dtok)
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+ {
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+ if (config_bool($res, 'bcm2708_fb') ||
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+ config_bool($res, 'brcm,bcm2835-mmc') ||
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+ config_bool($res, 'brcm,bcm2835-sdhost'))
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+ {
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+ $dtok ||= config_bool($res, 'brcm,bcm2708-pinctrl');
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+ $dtok ||= config_bool($res, 'brcm,bcm2835-gpio');
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+ $is_283x ||= config_bool($res, 'brcm,bcm2835');
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+ $is_283x ||= config_bool($res, 'brcm,bcm2836');
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+ $dtok ||= $is_283x;
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+ $append_trailer = 1;
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+ }
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+ else
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+ {
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+ print ("* This doesn't look like a Raspberry Pi kernel. In pass-through mode.\n");
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+ }
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+ }
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+}
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+elsif (!$dtok)
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+{
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+ print ("* Is this a valid kernel? In pass-through mode.\n");
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+}
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+
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+if ($append_trailer)
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+{
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+ printf("DT: %s\n", $dtok ? "y" : "n");
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+ printf("283x: %s\n", $is_283x ? "y" : "n");
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+
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+ my @atoms;
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+
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+ push @atoms, [ $trailer_magic, pack('V', 0) ];
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+ push @atoms, [ 'KVer', $kver ];
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+ push @atoms, [ 'DTOK', pack('V', $dtok) ];
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+ push @atoms, [ '283x', pack('V', $is_283x) ];
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+
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+ $trailer = pack_trailer(\@atoms);
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+ $atoms[0]->[1] = pack('V', length($trailer));
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+
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+ $trailer = pack_trailer(\@atoms);
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+}
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+
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+my $ofh;
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+my $total_len = 0;
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+
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+if ($out_file eq $kernel_file)
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+{
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+ die "* Failed to open '$out_file' for append\n"
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+ if (!open($ofh, '>>', $out_file));
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+ $total_len = tell($ofh);
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+}
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+else
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+{
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+ die "* Failed to open '$kernel_file'\n"
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+ if (!open(my $ifh, '<', $kernel_file));
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+ die "* Failed to create '$out_file'\n"
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+ if (!open($ofh, '>', $out_file));
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+
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+ my $copybuf;
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+ while (1)
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+ {
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+ my $bytes = sysread($ifh, $copybuf, 64*1024);
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+ last if (!$bytes);
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+ syswrite($ofh, $copybuf, $bytes);
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+ $total_len += $bytes;
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+ }
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+ close($ifh);
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+}
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+
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+if ($trailer)
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+{
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+ # Pad to word-alignment
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+ syswrite($ofh, "\x000\x000\x000", (-$total_len & 0x3));
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+ syswrite($ofh, $trailer);
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+}
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+
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+close($ofh);
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+
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+exit($trailer ? 0 : 1);
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+
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+END {
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+ unlink($tmpfile1) if ($tmpfile1);
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+ unlink($tmpfile2) if ($tmpfile2);
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+}
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+
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+
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+sub usage
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+{
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+ print ("Usage: mkknlimg [--dtok] [--283x] <vmlinux|zImage|bzImage> <outfile>\n");
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+ exit(1);
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+}
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+
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+sub try_extract
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+{
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+ my ($knl, $tmp) = @_;
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+
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+ my $ver = `strings "$knl" | grep -a -E "^Linux version [1-9]"`;
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+
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+ return undef if (!$ver);
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+
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+ chomp($ver);
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+
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+ my $res = { ''=>$ver };
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+ my $string_pattern = '^('.join('|', @wanted_strings).')$';
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+
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+ my @matches = `strings \"$knl\" | grep -E \"$string_pattern\"`;
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+ foreach my $match (@matches)
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+ {
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+ chomp($match);
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+ $res->{$match} = 1;
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+ }
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+
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+ return $res;
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+}
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+
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+
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+sub try_decompress
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+{
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+ my ($magic, $subst, $zcat, $idx, $knl, $tmp1, $tmp2) = @_;
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+
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+ my $pos = `tr "$magic\n$subst" "\n$subst=" < "$knl" | grep -abo "^$subst"`;
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+ if ($pos)
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+ {
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+ chomp($pos);
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+ $pos = (split(/[\r\n]+/, $pos))[$idx];
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+ return undef if (!defined($pos));
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+ $pos =~ s/:.*[\r\n]*$//s;
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+ my $cmd = "tail -c+$pos \"$knl\" | $zcat > $tmp2 2> /dev/null";
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+ my $err = (system($cmd) >> 8);
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+ return undef if (($err != 0) && ($err != 2));
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+
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+ return try_extract($tmp2, $tmp1);
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+ }
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+
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+ return undef;
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+}
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+
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+sub pack_trailer
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+{
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+ my ($atoms) = @_;
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+ my $trailer = pack('VV', 0, 0);
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+ for (my $i = $#$atoms; $i>=0; $i--)
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+ {
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+ my $atom = $atoms->[$i];
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+ $trailer .= pack('a*x!4Va4', $atom->[1], length($atom->[1]), $atom->[0]);
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+ }
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+ return $trailer;
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+}
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+
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+sub config_bool
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+{
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+ my ($configs, $wanted) = @_;
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+ my $val = $configs->{$wanted} || 'n';
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+ return (($val eq 'y') || ($val eq '1'));
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+}
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