mirror of
https://github.com/xcat2/confluent.git
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58 lines
1.4 KiB
Python
58 lines
1.4 KiB
Python
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import os
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import struct
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import termios
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addrtoname = {
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0x3f8: '/dev/ttyS0',
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0x2f8: '/dev/ttyS1',
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0x3e8: '/dev/ttyS2',
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0x2e8: '/dev/ttyS3',
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}
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speedmap = {
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0: None,
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3: 9600,
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4: 19200,
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6: 57600,
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7: 115200,
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}
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termiobaud = {
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9600: termios.B9600,
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19200: termios.B19200,
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57600: termios.B57600,
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115200: termios.B115200,
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}
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def do_serial_config():
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if 'console=ttyS' in open('/proc/cmdline').read():
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return None # Do not do autoconsole if manually configured
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spcr = open("/sys/firmware/acpi/tables/SPCR", "rb")
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spcr = bytearray(spcr.read())
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if spcr[8] != 2 or spcr[36] != 0 or spcr[40] != 1:
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return None
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address = struct.unpack('<Q', spcr[44:52])[0]
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tty = None
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try:
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tty = addrtoname[address]
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except KeyError:
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return None
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retval = { 'tty': tty }
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try:
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retval['speed'] = speedmap[spcr[58]]
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except KeyError:
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return None
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if retval['speed']:
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ttyf = os.open(tty, os.O_RDWR | os.O_NOCTTY)
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currattr = termios.tcgetattr(ttyf)
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currattr[4:6] = [0, termiobaud[retval['speed']]]
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termios.tcsetattr(ttyf, termios.TCSANOW, currattr)
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return retval
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if __name__ == '__main__':
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serialinfo = do_serial_config()
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if serialinfo:
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os.execl(
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'/bin/setsid', 'setsid', 'sh', '-c',
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'exec screen -x console <> {0} >&0 2>&1'.format(serialinfo['tty']))
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