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memory model: remove blist dependency, model just 256k memory for 32bit address space

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This commit is contained in:
BigEd 2011-08-21 21:52:22 +01:00
parent 40f77afd67
commit 36a0731483
1 changed files with 10 additions and 14 deletions
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24
src/py65/memory.py
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@ -1,20 +1,11 @@
# this sparse array module only needed for large-memory CPU models
try:
from blist import *
except ImportError:
pass
class ObservableMemory:
def __init__(self, subject=None, addrWidth=16):
self.physMask = 0xffff
if addrWidth > 16:
# even with 32-bit address space, model only 256k memory
self.physMask = 0x3ffff
if subject is None:
if addrWidth <= 16:
subject = 0x10000 * [0x00]
else:
try:
subject = blist([0]) * (1 << addrWidth)
except:
print "Fatal: failed to initialise large memory for this CPU"
exit (1)
subject = (self.physMask+1) * [0x00]
self._subject = subject
@ -22,6 +13,7 @@ class ObservableMemory:
self._write_subscribers = {}
def __setitem__(self, address, value):
address &= self.physMask
callbacks = self._write_subscribers.get(address, [])
for callback in callbacks:
@ -32,6 +24,7 @@ class ObservableMemory:
self._subject[address] = value
def __getitem__(self, address):
address &= self.physMask
callbacks = self._read_subscribers.get(address, [])
final_result = None
@ -50,15 +43,18 @@ class ObservableMemory:
def subscribe_to_write(self, address_range, callback):
for address in address_range:
address &= self.physMask
callbacks = self._write_subscribers.setdefault(address, [])
if callback not in callbacks:
callbacks.append(callback)
def subscribe_to_read(self, address_range, callback):
for address in address_range:
address &= self.physMask
callbacks = self._read_subscribers.setdefault(address, [])
if callback not in callbacks:
callbacks.append(callback)
def write(self, start_address, bytes):
start_address &= self.physMask
self._subject[start_address:start_address+len(bytes)] = bytes