mirror of
https://github.com/chipsec/chipsec
synced 2026-06-08 13:31:00 +00:00
BrentHoltsclaw
103 lines
3.2 KiB
Python
103 lines
3.2 KiB
Python
#!/usr/bin/python
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#CHIPSEC: Platform Security Assessment Framework
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#Copyright (c) 2010-2019, Intel Corporation
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#
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#This program is free software; you can redistribute it and/or
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#modify it under the terms of the GNU General Public License
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#as published by the Free Software Foundation; Version 2.
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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, write to the Free Software
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#Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#
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#Contact information:
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#chipsec@intel.com
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#
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# -------------------------------------------------------------------------------
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#
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# CHIPSEC: Platform Hardware Security Assessment Framework
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#
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# -------------------------------------------------------------------------------
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"""
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CMOS memory specific functions (dump, read/write)
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usage:
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>>> cmos.dump_low()
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>>> cmos.dump_high()
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>>> cmos.dump()
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>>> cmos.read_cmos_low( offset )
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>>> cmos.write_cmos_low( offset, value )
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>>> cmos.read_cmos_high( offset )
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>>> cmos.write_cmos_high( offset, value )
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"""
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import struct
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import sys
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import time
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from chipsec.hal import hal_base
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import chipsec.logger
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class CmosRuntimeError (RuntimeError):
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pass
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class CmosAccessError (RuntimeError):
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pass
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CMOS_ADDR_PORT_LOW = 0x70
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CMOS_DATA_PORT_LOW = 0x71
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CMOS_ADDR_PORT_HIGH = 0x72
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CMOS_DATA_PORT_HIGH = 0x73
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class CMOS(hal_base.HALBase):
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def __init__(self, cs):
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super(CMOS, self).__init__(cs)
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def read_cmos_high( self, offset ):
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self.cs.io.write_port_byte( CMOS_ADDR_PORT_HIGH, offset )
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return self.cs.io.read_port_byte( CMOS_DATA_PORT_HIGH )
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def write_cmos_high( self, offset, value ):
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self.cs.io.write_port_byte( CMOS_ADDR_PORT_HIGH, offset )
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self.cs.io.write_port_byte( CMOS_DATA_PORT_HIGH, value )
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def read_cmos_low( self, offset ):
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self.cs.io.write_port_byte( CMOS_ADDR_PORT_LOW, 0x80|offset )
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return self.cs.io.read_port_byte( CMOS_DATA_PORT_LOW )
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def write_cmos_low( self, offset, value ):
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self.cs.io.write_port_byte( CMOS_ADDR_PORT_LOW, offset )
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self.cs.io.write_port_byte( CMOS_DATA_PORT_LOW, value )
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def dump_low( self ):
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cmos_buf = [0xFF]*0x80
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orig = self.cs.io.read_port_byte( CMOS_ADDR_PORT_LOW )
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for off in range(0x80):
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cmos_buf[off] = self.read_cmos_low( off )
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self.cs.io.write_port_byte( CMOS_ADDR_PORT_LOW, orig )
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return cmos_buf
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def dump_high( self ):
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cmos_buf = [0xFF]*0x80
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orig = self.cs.io.read_port_byte( CMOS_ADDR_PORT_HIGH )
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for off in range(0x80):
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cmos_buf[off] = self.read_cmos_high( off )
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self.cs.io.write_port_byte( CMOS_ADDR_PORT_HIGH, orig )
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return cmos_buf
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def dump( self ):
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self.logger.log( "Low CMOS memory contents:" )
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chipsec.logger.pretty_print_hex_buffer( self.dump_low() )
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self.logger.log( "\nHigh CMOS memory contents:" )
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chipsec.logger.pretty_print_hex_buffer( self.dump_high() )
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