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#!/usr/bin/perl
# IBM_PROLOG_BEGIN_TAG
# This is an automatically generated prolog.
#
# $Source: src/build/debug/Hostboot/PageMgr.pm $
#
# OpenPOWER HostBoot Project
#
# Contributors Listed Below - COPYRIGHT 2012,2018
# [+] International Business Machines Corp.
#
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied. See the License for the specific language governing
# permissions and limitations under the License.
#
# IBM_PROLOG_END_TAG
use strict;
package Hostboot::PageMgr;
use Exporter;
our @EXPORT_OK = ('main');
use constant PAGEMGR_INSTANCE_NAME =>
"Singleton<PageManager>::instance()::instance";
use constant PAGEMGR_CORE_OFFSET => 5 * 8;
use constant PAGEMGR_PAGES_AVAIL_OFFSET => 0;
use constant PAGEMGR_BUCKETS_OFFSET => 8;
use constant PAGEMGR_NUMBER_OF_BUCKETS => 16;
sub main
{
my ($packName, $args) = @_;
# Parse 'debug' option.
my $debug = 0;
if (defined $args->{"debug"})
{
$debug = 1;
}
my $showpages = 0;
if (defined $args->{"showpages"})
{
$showpages = 1;
}
# Find the PageManager
my ($symAddr, $symSize) = ::findPointer("PAGEMGR ",
PAGEMGR_INSTANCE_NAME);
if (not defined $symAddr)
{
::userDisplay "Couldn't find ".PAGEMGR_INSTANCE_NAME;
die;
}
# Increment to the PageManagerCore for the general heap.
$symAddr = $symAddr + PAGEMGR_CORE_OFFSET;
# Read pages available.
my $pagesAvail = ::read64($symAddr + PAGEMGR_PAGES_AVAIL_OFFSET);
::userDisplay "Pages available: ".$pagesAvail."\n";
# Parse through buckets and count pages in buckets.
my $pagesInBuckets = 0;
for (my $bucket = 0; $bucket < PAGEMGR_NUMBER_OF_BUCKETS; $bucket++)
{
my $stackAddr = ::read32($symAddr + PAGEMGR_BUCKETS_OFFSET +
(8 * $bucket) + 4);
my $stackCount = countItemsInStack($stackAddr);
my $size = (1 << $bucket) * $stackCount;
$pagesInBuckets = $pagesInBuckets + $size;
::userDisplay "Bucket $bucket has $stackCount blocks for ".
"$size pages.\n" if $debug;
if( $debug && $showpages ) {
showPagesInStack($stackAddr,(1 << $bucket));
}
}
::userDisplay "Pages in buckets: ".$pagesInBuckets."\n";
# Compare if they match. Hopefully they do.
if ($pagesAvail != $pagesInBuckets)
{
my $difference = abs ($pagesAvail - $pagesInBuckets);
::userDisplay "WARNING: Values differ by $difference!!\n";
}
}
sub countItemsInStack
{
my $stack = shift;
return 0 if (0 == $stack);
#only read bottom 32 bits of ptr to handle AbaPtr
return 1 + countItemsInStack(::read32($stack + 4));
}
sub showPagesInStack
{
my $stack = shift;
my $bucketsize = shift;
return 0 if (0 == $stack);
::userDisplay(sprintf "..mem=0x%.16X..0x%.16X : %d\n",
$stack, $stack+4096*$bucketsize, $bucketsize );
#only read bottom 32 bits of ptr to handle AbaPtr
return 1 + showPagesInStack(::read32($stack+4),$bucketsize);
}
sub helpInfo
{
my %info = (
name => "PageMgr",
intro => ["Calculates free pages in Kernel PageManager."],
options => { "debug" => ["Turn on additional debug messages"], },
);
}
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