51 lines
1.4 KiB
Plaintext
51 lines
1.4 KiB
Plaintext
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#! /bin/sh -e
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# Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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#
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# Finds the largest NV space that can be defined on the TPM in this state
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# (i.e. without removing existing spaces).
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#
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# The TPM must be unowned, and physical presence must be on.
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low=1
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high=1500
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try=$high
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# Binary search with no upper bound
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while true; do
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## echo trying $try [ $low $high ]
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if /usr/bin/tpmc definespace 0xf004 $(printf "%#x" $try) 0x1 \
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> /dev/null 2>&1; then
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# definespace success: end, or $try must grow
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if [ $try -eq $low ]; then
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echo $low
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exit 0
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elif [ $try -lt $high ]; then
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low=$try
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try=$(( ( $high + $low ) / 2 ))
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else
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# special case: when try == high, expand the search
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low=$try
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try=$(( $try * 2 ))
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high=$try
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fi
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else
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# check for unexpected errors
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result=$?
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if [ $result -ne 17 ]; then
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echo running tpmc definespace 0xf004 0x1 0x1
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/usr/bin/tpmc definespace 0xf004 0x1 0x1
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echo please correct this condition and try again
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exit 1
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fi
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# definespace failure: end, or $try must shrink
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if [ $try -eq $low ]; then
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echo 0
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exit 0
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fi
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high=$try
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try=$(( ( $high + $low ) / 2 ))
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fi
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done
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