def getIommuAGAW(self, iommuaddr, devmem, capoffset, capbytesize, agawbitstart):
"Gets the AGAW name from a given iommuaddr, at the capability offset"
AGAW_39_BITNO = 1
AGAW_48_BITNO = 2
AGAW_39_NAME = "39"
AGAW_48_NAME = "48"
name = "agaw"
try:
startaddr = int(iommuaddr, 16) + int(capoffset, 16)
capreg = extractor.extractBinaryData(devmem,
startaddr,
capbytesize)
except IOError:
message.addError("Could not access file: %s" % devmem, False)
else:
agaw = (int(capreg, 16) >> agawbitstart) & 0x1F # See 5 bits
if util.getBit(agaw, AGAW_39_BITNO):
name = AGAW_39_NAME
elif util.getBit(agaw, AGAW_48_BITNO):
name = AGAW_48_NAME
else:
message.addError("AGAW Capability could not be found for IOMMU "
"device at: %s" % iommuaddr, False)
return name
def getVmxFromMSR(self, msrpath, offset, vmxbitsize):
"Gets VmxTimerRate value from a given msr path"
# Try to find MSR file
byte = extractor.extractBinaryData(msrpath, offset, 1)
# Raises IOError here if not found
vmxbits = 0
# Get bits from VMX_BITS_START to VMX_BITS_END
for bitnum in range(0, vmxbitsize):
vmxbits += util.getBit(int(byte, 16), bitnum) << bitnum
vmxTimerRate = int(vmxbits)
return vmxTimerRate
def _extractCapability(self, devicepath, configfilename):
"Gets capability for device"
CAPABILITY_START = 0x34
STATUS_REG_LOCATION = 0x6
CAPABILITY_BIT_POS = 4
NEXT_OFFSET = 1
CAP_SIZE = 1
STOP_ID = 0x00
CAPABILITY_NUM = 48
CONFIG_PATH = os.path.join(devicepath, configfilename)
# Checks config file whether capability bit is activated
capbyte = extractor.extractBinaryData(
CONFIG_PATH, STATUS_REG_LOCATION, 1)
capint = int(capbyte, 16)
if util.getBit(capint, CAPABILITY_BIT_POS):
# Checks config file, starting at CAPABILITY_START and moving
# through linked list
self.capabilities[devicepath] = self._readCapFile(CONFIG_PATH,
CAPABILITY_START,
CAP_SIZE,
NEXT_OFFSET,
STOP_ID,
CAPABILITY_NUM)
def get_cap_msix(fileobj):
byte = struct.unpack('B', fileobj.read(1))[0]
enablebit = util.getBit(byte, 0) # Last bit
value = CAP_MSIX_VALUE(enable=enablebit)
return value