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1 #! /bin/sh -e | 1 #! /bin/sh -e |
2 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved. | 2 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved. |
3 # Use of this source code is governed by a BSD-style license that can be | 3 # Use of this source code is governed by a BSD-style license that can be |
4 # found in the LICENSE file. | 4 # found in the LICENSE file. |
5 # | 5 # |
6 # Finds the largest NV space that can be defined on the TPM in this state | 6 # Finds the largest NV space that can be defined on the TPM in this state |
7 # (i.e. without removing existing spaces). | 7 # (i.e. without removing existing spaces). |
8 # | 8 # |
9 # The TPM must be unowned, and physical presence must be on. | 9 # The TPM must be unowned, and physical presence must be on. |
10 | 10 |
11 low=1 | 11 low=1 |
12 high=1500 | 12 high=1500 |
13 try=$high | 13 try=$high |
14 | 14 |
15 # Binary search with no upper bound | 15 # Binary search with no upper bound |
16 while true; do | 16 while true; do |
17 ## echo trying $try [ $low $high ] | 17 ## echo trying $try [ $low $high ] |
18 if /usr/bin/tpmc definespace 0xf004 $(printf "0x%x" $try) 0x1 \ | 18 if /usr/bin/tpmc definespace 0xf004 $(printf "0x%x" $try) 0x1 \ |
19 > dev/null 2>&1; then | 19 > /dev/null 2>&1; then |
20 # definespace success: end, or $try must grow | 20 # definespace success: end, or $try must grow |
21 if [ $try -eq $low ]; then | 21 if [ $try -eq $low ]; then |
22 echo $low | 22 echo $low |
23 exit 0 | 23 exit 0 |
24 elif [ $try -lt $high ]; then | 24 elif [ $try -lt $high ]; then |
25 low=$try | 25 low=$try |
26 try=$(( ( $high + $low ) / 2 )) | 26 try=$(( ( $high + $low ) / 2 )) |
27 else | 27 else |
28 # special case: when try == high, expand the search | 28 # special case: when try == high, expand the search |
29 low=$try | 29 low=$try |
(...skipping 11 matching lines...) Expand all Loading... |
41 fi | 41 fi |
42 # definespace failure: end, or $try must shrink | 42 # definespace failure: end, or $try must shrink |
43 if [ $try -eq $low ]; then | 43 if [ $try -eq $low ]; then |
44 echo 0 | 44 echo 0 |
45 exit 0 | 45 exit 0 |
46 fi | 46 fi |
47 high=$try | 47 high=$try |
48 try=$(( ( $high + $low ) / 2 )) | 48 try=$(( ( $high + $low ) / 2 )) |
49 fi | 49 fi |
50 done | 50 done |
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