98 lines
3.3 KiB
Python
98 lines
3.3 KiB
Python
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#
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# edd.py
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# BIOS EDD data parsing functions
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#
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# Copyright (C) 2010 Red Hat, Inc. All rights reserved.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# Author(s): Hans de Goede <hdegoede@redhat.com>
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#
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import os
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import struct
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import logging
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log = logging.getLogger("storage")
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def get_edd_dict(devices):
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"""Given an array of devices return a dict with the BIOS ID for them."""
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edd_dict = {}
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for biosdev in range(80, 80 + 15):
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sysfspath = "/sys/firmware/edd/int13_dev%d" % biosdev
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if not os.path.exists(sysfspath):
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break # We are done
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sysfspath = "/sys/firmware/edd/int13_dev%d/mbr_signature" % biosdev
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if not os.path.exists(sysfspath):
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log.warning("No mbrsig for biosdev: %d" % biosdev)
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continue
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try:
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file = open(sysfspath, "r")
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eddsig = file.read()
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file.close()
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except (IOError, OSError) as e:
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log.warning("Error reading EDD mbrsig for %d: %s" %
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(biosdev, str(e)))
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continue
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sysfspath = "/sys/firmware/edd/int13_dev%d/sectors" % biosdev
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try:
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file = open(sysfspath, "r")
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eddsize = file.read()
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file.close()
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except (IOError, OSError) as e:
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eddsize = None
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found = []
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for dev in devices:
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try:
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fd = os.open(dev.path, os.O_RDONLY)
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os.lseek(fd, 440, 0)
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mbrsig = struct.unpack('I', os.read(fd, 4))
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os.close(fd)
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except OSError as e:
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log.warning("Error reading mbrsig from disk %s: %s" %
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(dev.name, str(e)))
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continue
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mbrsigStr = "0x%08x\n" % mbrsig
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if mbrsigStr == eddsig:
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if eddsize:
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sysfspath = "/sys%s/size" % dev.sysfsPath
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try:
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file = open(sysfspath, "r")
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size = file.read()
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file.close()
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except (IOError, OSError) as e:
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log.warning("Error getting size for: %s" % dev.name)
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continue
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if eddsize != size:
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continue
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found.append(dev.name)
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if not found:
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log.error("No matching mbr signature found for biosdev %d" %
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biosdev)
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elif len(found) > 1:
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log.error("Multiple signature matches found for biosdev %d: %s" %
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(biosdev, str(found)))
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else:
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log.info("Found %s for biosdev %d" %(found[0], biosdev))
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edd_dict[found[0]] = biosdev
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return edd_dict
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