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use ctype binding for memmap

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This commit is contained in:
Nikolay Khabarov
2017-05-14 15:00:12 +03:00
parent d59b058caa
commit 7fa42aa200
1 changed files with 19 additions and 9 deletions
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cnc/hal_raspberry/rpgpio_private.py
+19 -9
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@@ -112,6 +112,8 @@ def CM_DIV_VALUE(x):
class PhysicalMemory(object): class PhysicalMemory(object):
lc = ctypes.cdll.LoadLibrary('libc.so.6')
def __init__(self, phys_address, size=PAGE_SIZE): def __init__(self, phys_address, size=PAGE_SIZE):
""" Create object which maps physical memory to Python's mmap object. """ Create object which maps physical memory to Python's mmap object.
:param phys_address: based address of physical memory :param phys_address: based address of physical memory
@@ -119,13 +121,18 @@ class PhysicalMemory(object):
self._size = size self._size = size
phys_address -= phys_address % PAGE_SIZE phys_address -= phys_address % PAGE_SIZE
fd = self._open_dev("/dev/mem") fd = self._open_dev("/dev/mem")
self._rmap = mmap.mmap(fd, size, flags=mmap.MAP_SHARED, # Pypy doesn't work correctly with Python's mmap, use native calls
prot=mmap.PROT_READ | mmap.PROT_WRITE, # self._rmap = mmap.mmap(fd, size, flags=mmap.MAP_SHARED,
offset=phys_address) # prot=mmap.PROT_READ | mmap.PROT_WRITE,
# offset=phys_address)
self._rmap = self.lc.mmap(None, size, mmap.PROT_READ | mmap.PROT_WRITE,
mmap.MAP_SHARED, fd, phys_address)
os.close(fd)
atexit.register(self.cleanup) atexit.register(self.cleanup)
def cleanup(self): def cleanup(self):
self._rmap.close() # self._rmap.close()
self.lc.munmap(self._rmap, self._size)
@staticmethod @staticmethod
def _open_dev(name): def _open_dev(name):
@@ -139,19 +146,22 @@ class PhysicalMemory(object):
os.close(fd) os.close(fd)
def write_int(self, address, int_value): def write_int(self, address, int_value):
self._rmap[address:address + 4] = struct.pack("I", int_value) # self._rmap[address:address + 4] = struct.pack("I", int_value)
ctypes.c_uint32.from_address(self._rmap + address).value = int_value
def write(self, address, data): def write(self, address, data):
self._rmap.seek(address) # self._rmap.seek(address)
self._rmap.write(struct.pack(str(len(data)) + "I", *data)) # self._rmap.write(struct.pack(str(len(data)) + "I", *data))
for i in range(0, len(data)):
self.write_int(address + i * 4, data[i])
def read_int(self, address): def read_int(self, address):
return struct.unpack("I", self._rmap[address:address + 4])[0] # return struct.unpack("I", self._rmap[address:address + 4])[0]
return ctypes.c_uint32.from_address(self._rmap + address).value
def get_size(self): def get_size(self):
return self._size return self._size
class CMAPhysicalMemory(PhysicalMemory): class CMAPhysicalMemory(PhysicalMemory):
IOCTL_MBOX_PROPERTY = ctypes.c_long(0xc0046400).value IOCTL_MBOX_PROPERTY = ctypes.c_long(0xc0046400).value
def __init__(self, size): def __init__(self, size):