mirror of
https://github.com/chipsec/chipsec
synced 2026-06-08 13:31:00 +00:00
Nathaniel Mitchell
125 lines
5.0 KiB
Python
125 lines
5.0 KiB
Python
# CHIPSEC: Platform Security Assessment Framework
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# Copyright (c) 2010-2021, 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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Access to virtual memory
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usage:
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>>> read_virtual_mem( 0xf0000, 0x100 )
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>>> write_virtual_mem( 0xf0000, 0x100, buffer )
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>>> write_virtual_mem_dowrd( 0xf0000, 0xdeadbeef )
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>>> read_virtual_mem_dowrd( 0xfed40000 )
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"""
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import struct
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from typing import Tuple
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from chipsec.library.logger import logger, print_buffer_bytes
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from chipsec.hal import hal_base
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class VirtMemory(hal_base.HALBase):
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def __init__(self, cs):
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super(VirtMemory, self).__init__(cs)
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self.helper = cs.helper
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####################################################################################
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#
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# virtual memory API using 64b virtual Address
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# (Same functions as below just using 64b PA instead of High and Low 32b parts of PA)
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#
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####################################################################################
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# Reading virtual memory
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def read_virtual_mem(self, virt_address: int, length: int) -> int:
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logger().log_hal(f'[mem] 0x{virt_address:016X}')
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phys_address = self.va2pa(virt_address)
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return self.helper.read_phys_mem(phys_address, length)
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def read_virtual_mem_dword(self, virt_address: int) -> int:
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phys_address = self.va2pa(virt_address)
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out_buf = self.helper.read_phys_mem(phys_address, 4)
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value = struct.unpack('=I', out_buf)[0]
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logger().log_hal(f'[mem] dword at VA = 0x{virt_address:016X}: 0x{value:08X}')
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return value
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def read_virtual_mem_word(self, virt_address: int) -> int:
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phys_address = self.va2pa(virt_address)
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out_buf = self.helper.read_phys_mem(phys_address, 2)
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value = struct.unpack('=H', out_buf)[0]
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logger().log_hal(f'[mem] word at VA = 0x{virt_address:016X}: 0x{value:04X}')
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return value
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def read_virtual_mem_byte(self, virt_address: int) -> int:
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phys_address = self.va2pa(virt_address)
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out_buf = self.helper.read_phys_mem(phys_address, 1)
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value = struct.unpack('=B', out_buf)[0]
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logger().log_hal(f'[mem] byte at VA = 0x{virt_address:016X}: 0x{value:02X}')
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return value
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# Writing virtual memory
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def write_virtual_mem(self, virt_address: int, length: int, buf: bytes) -> int:
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logger().log_hal(f'[mem] buffer len = 0x{length:X} to VA = 0x{virt_address:016X}')
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if logger().HAL:
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print_buffer_bytes(buf)
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phys_address = self.va2pa(virt_address)
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return self.helper.write_phys_mem(phys_address, length, buf)
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def write_virtual_mem_dword(self, virt_address: int, dword_value: int) -> int:
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logger().log_hal(f'[mem] dword to VA = 0x{virt_address:016X} <- 0x{dword_value:08X}')
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phys_address = self.va2pa(virt_address)
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return self.helper.write_phys_mem(phys_address, 4, struct.pack('I', dword_value))
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def write_virtual_mem_word(self, virt_address: int, word_value: int) -> int:
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logger().log_hal(f'[mem] word to VA = 0x{virt_address:016X} <- 0x{word_value:04X}')
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phys_address = self.va2pa(virt_address)
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return self.helper.write_phys_mem(phys_address, 2, struct.pack('H', word_value))
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def write_virtual_mem_byte(self, virt_address: int, byte_value: int) -> int:
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logger().log_hal(f'[mem] byte to VA = 0x{virt_address:016X} <- 0x{byte_value:02X}')
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phys_address = self.va2pa(virt_address)
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return self.helper.write_phys_mem(phys_address, 1, struct.pack('B', byte_value))
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# Allocate virtual memory buffer
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def alloc_virtual_mem(self, length: int, max_phys_address: int = 0xFFFFFFFFFFFFFFFF) -> Tuple[int, int]:
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(va, pa) = self.helper.alloc_phys_mem(length, max_phys_address)
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logger().log_hal(f'[mem] Allocated: PA = 0x{pa:016X}, VA = 0x{va:016X}')
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return (va, pa)
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def va2pa(self, va: int) -> int:
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(pa, error_code) = self.helper.va2pa(va)
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if error_code:
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logger().log_hal(f'[mem] Looks like VA (0x{va:016X}) not mapped')
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return va
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logger().log_hal(f'[mem] VA (0x{va:016X}) -> PA (0x{pa:016X})')
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return pa
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def free_virtual_mem(self, virt_address: int) -> bool:
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pa = self.va2pa(virt_address)
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ret = self.helper.free_phys_mem(pa)
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logger().log_hal(f'[mem] Deallocated : VA = 0x{virt_address:016X}')
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return ret == 1
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haldata = {"arch":[hal_base.HALBase.MfgIds.Any], 'name': {'virtmemory': "VirtMemory"}}
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