$Id: patch6.in /main/7 2009/07/10 16:36:05 alfords Exp $ Copyright 2009 Automatic Data Processing, Inc. See the README file in the first patch of this series for important details. e820.py is a Python script. It defines the e820Info class. The e820Info class reads the BIOS 15h/e820 memory map. We found that map to be a somewhat more reliable indicator of how much memory was actually on the system than /proc/meminfo. That map can can be found in /tmp/syslog while ramdisk Linux runs, or in /var/log/dmesg when regular Linux runs. The e820Info class can provide a sum of the memory reported found in the e820 map. The e820Info class recognizes the e820 map formats produced by the 2.4.* and 2.6* kernels with which we have tried it. e820.py has not changed since 2002, since I distributed it the first time. For completeness, I'm sending it out again. The "COPYING" file it refers to is, of course, the file that holds the text of the GNU General Public License Version 2. --Seth Alford ADP Dealer Services seth_alford@xxxxxxx ----e820.py follows---- #! /usr/bin/python # $Id: e820.py /main/8 2002/07/10 19:53:47 setha Exp $ # # Reads the e820 map near the start of the input file. # # Copyright (c) 2001-2002 Automatic Data Processing Inc. The distribution # terms are as noted in the file COPYING. import sys import re import string class e820Info: # Get information about memory from the memory map printed # by the 15h/e820 BIOS call, which is presumed to be in the # file supplied in parameter file. That file is either one or # another form of syslog output; or /proc/e820info in later 2.4 # series kernels with e820 proc info enabled in .config. # # By default, this class assumes /proc/e820info. Pass a file # parameter to look in one or more of the syslog output files. def __init__(self, file="/proc/e820info"): try: f=open(file, "r") except: print "Could not open", file sys.exit(1) e820map=0 accum=0 # This class recognizes 4 forms of the e820 map. Forms # 1-3 are found in one of the syslog output files. # Form 4 is found only in /proc/e820info. # Form 1: # BIOS-e820: start - end (usable) # Form 2: # <4> BIOS-e820: size @ start (usable) # Form 3: # <4> BIOS-e820: start - end (usable) # Form 4, only in /proc/e820info: # size @ start (usable) # # I have only seen form 2 in the ramdisk environment # with the 2.4.2 kernel. Form 2 is therefore older. # I believe that syslog in the ramdisk environment # prepends the "<4>". We first saw form 3 in Martin's # PC with the 2.4.10 kernel. if file == "/proc/e820info": e820map=4 while 1: l=f.readline() if not l: break fields=string.split(l) if e820map==1 and fields[0] != "BIOS-e820:": # Done reading the map break if (e820map==2 or e820map==3) and fields[1] != "BIOS-e820:": # Done reading the map break if fields[0] == "BIOS-e820:" and e820map==0: e820map=1 if fields[0] == "<4>" and fields[1] == "BIOS-e820:" and e820map==0: if fields[3] == "@": e820map=2 elif fields[3] == "-": e820map=3 else: print "Unknown e820 log file format (form 2 or 3,) giving up" sys.exit(1) if not e820map: continue if e820map == 1 or e820map == 3: # Convert the type 3 into a type 1 if e820map == 3: fields=fields[1:] # Form 1 e820 map sanity check: if fields[2] != "-": print "Unknown e820 log file format (form 1 or 3,) giving up" sys.exit(1) start=string.atol(fields[1],16) end=string.atol(fields[3],16) diff = end - start if fields[4] == "(usable)" or fields[4] == "(ACPI data)": accum = accum + diff if e820map == 2 or e820map == 4: # Convert the type 2 information into a type 4 if e820map == 2: fields=fields[2:] # Treat fields as a form 4 e820 map # Sanity check: if fields[1] != "@": print "Unknown log file format (form 2 or 4,) giving up" sys.exit(1) diff = string.atol(fields[0],16) if fields[3] == "(usable)" or fields[3] == "(ACPI data)": accum = accum + diff # If we get here, and e820map is still 0, then we could not find # an e820 map and so it is time to give up. if not e820map: print "Could not find e820 map, giving up" sys.exit(1) megabyte = 1024.0*1024.0 self.memtotal = int(round(accum/megabyte)) if __name__ == '__main__': if len(sys.argv) != 2: print "Usage: %s log_file" % sys.argv[0] sys.exit(1) #NOTREACHED e820info = e820Info(file=sys.argv[1]) print e820info.memtotal sys.exit(0) This message and any attachments are intended only for the use of the addressee and may contain information that is privileged and confidential. If the reader of the message is not the intended recipient or an authorized representative of the intended recipient, you are hereby notified that any dissemination of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by e-mail and delete the message and any attachments from your system. _______________________________________________ Anaconda-devel-list mailing list Anaconda-devel-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/anaconda-devel-list
