Viewing: phys_mem_map.py
"""
Provide access to physical memory information.
Copyright 2014, 2017 Cray Inc. All Rights Reserved
"""
from pykdump.API import *
import crashlib.cid
class Resource:
"""Generates /proc/iomem by traversing iomem Resource tree."""
def __init__(self, resource):
self.resource = resource
self.lvl = 0
def resource_start(self):
return self.resource.start
start = property(resource_start)
def resource_end(self):
return self.resource.end
end = property(resource_end)
def resource_name(self):
return self.resource.name
name = property(resource_name)
def addr(self):
return Addr(self.resource)
def __str__(self):
return '{0:08x}-{1:08x} : {2}'.format(self.start, self.end, self.name)
def get_child(self):
if self.resource.child:
return Resource(self.resource.child)
else:
return None
def get_sibling(self):
if self.resource.sibling:
return Resource(self.resource.sibling)
else:
return None
def _walk(self, lvl=0):
self.lvl = lvl
yield self
child = self.get_child()
if child is not None:
for res in child._walk(lvl+1):
yield res
next = self.get_sibling()
if next is not None:
for res in next._walk(lvl):
yield res
def iomem(self):
""" returns /proc/iomem tree generator """
return self.get_child()._walk()
def is_System_RAM(self):
return self.name == "System RAM"
def get_iomem():
""" generator wrapper function for iomem """
iomem_resource = Resource(readSymbol('iomem_resource'))
return iomem_resource.iomem()
class MemMapEntry:
"""Define a single entry for a memory map.
A MemMapEntry consists of three attributes:
start - first address within the range
end - first address past the end of the range
name - name of address space type
"""
start = None
end = None
name = None
def __init__(self, start_addr, end_addr, name_str):
self.start = int(start_addr)
self.end = int(end_addr)
self.name = name_str
def GetPhysMemMap():
"""Define a physical memory map.
Returns the physical memory map as a list by extracting system ram
ranges from iomem Resource class above.
The list defines the physical address map as provided the iomem
and will be a list of objects of type MemMapEntry.
"""
memmap = []
for ent in get_iomem():
# get System RAM from iomem resource
if ent.is_System_RAM():
memmap.append(MemMapEntry(ent.start, ent.end+1, ent.name))
return memmap
# --------------------------------------------------------------------------
# Create shared objects.
crashlib.cid.physmap = GetPhysMemMap()
