Windows Predictive Failure Analysis (PFA) Memory List Generator

pfa_memlist.py

import mmap
from typing import List

def get_bcdedit_set_badmemory_command(start_addr: int, end_addr: int) -> str:
  pages: str = ''
  pstart = start_addr // mmap.PAGESIZE
  pend   = (end_addr + mmap.PAGESIZE - 1) // mmap.PAGESIZE
  for p in range(pstart, pend + 1):
    pages += f'{hex(p)} '
  return f'bcdedit /set {{badmemory}} badmemorylist {pages}'

def decode_pfn_memorylist(data: str):
    # Note, decoding of addresses as 4 bytes integer (32bit)
    pages = []
    for i in range(0, len(data), 8):
        page = int(data[i:i+8][::-1], 16)
        pages.append(page)
    return pages
  
def encode_pfn_memorylist(pages: List[int]) -> str:
    # Note, encoding of addresses as 4 bytes integer (32bit)
    memlist: str = ""
    for p in pages:
        memlist += f'{p:08X}'[::-1]
    return memlist