49 lines
1.8 KiB
Python
49 lines
1.8 KiB
Python
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# Copyright 2021 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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import subprocess
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from autotest_lib.client.bin import test
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from autotest_lib.client.bin import utils
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from autotest_lib.client.common_lib import error
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class firmware_CbfsMcache(test.test):
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"""Validates that the CBFS metadata cache didn't overflow."""
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version = 1
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MCACHE_MAGIC_FULL = b'FULL'
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MCACHE_MAGIC_END = b'$END'
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CBMEM_RO_MCACHE = b'524d5346'
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CBMEM_RW_MCACHE = b'574d5346'
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def cbmem(self, *args):
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"""Runs 'cbmem' utility with specified arguments and returns output."""
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# Cannot use utils.run because it force-decodes stdout as UTF-8.
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return subprocess.check_output(('cbmem', ) + args)
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def has_mcache(self):
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"""Returns true iff there's an RO MCACHE section in CBMEM."""
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return self.CBMEM_RO_MCACHE in self.cbmem('-l')
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def check_mcache(self, cbmem_id, name):
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"""Fail if the cbmem_id mcache wasn't terminated with an END token."""
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mcache = self.cbmem('-r', cbmem_id)
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if mcache[-4:] == self.MCACHE_MAGIC_FULL:
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raise error.TestFail("CBFS %s mcache overflowed!" % name)
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if mcache[-4:] != self.MCACHE_MAGIC_END:
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raise error.TestError(
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"CBFS %s mcache ends with invalid token (%s)!" %
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mcache[-4:].__repr__())
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def run_once(self):
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"""Fail if mcaches exists and wasn't terminated with an END token."""
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if utils.get_board() == 'volteer':
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raise error.TestNAError("Skipped on Volteer, see b/187561710.")
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if not self.has_mcache():
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raise error.TestNAError("This platform doesn't use CBFS mcache.")
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self.check_mcache(self.CBMEM_RO_MCACHE, "RO")
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self.check_mcache(self.CBMEM_RW_MCACHE, "RW")
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