[ramdisk] add cvitek pre-built ramdisk

Change-Id: Ic7d2046a23358129eaf621b5558984a64fa7361d

ramdisk/rootfs/public/python3.7/arm64/lib/tty.py

@@ -0,0 +1,36 @@
+"""Terminal utilities."""
+
+# Author: Steen Lumholt.
+
+from termios import *
+
+__all__ = ["setraw", "setcbreak"]
+
+# Indexes for termios list.
+IFLAG = 0
+OFLAG = 1
+CFLAG = 2
+LFLAG = 3
+ISPEED = 4
+OSPEED = 5
+CC = 6
+
+def setraw(fd, when=TCSAFLUSH):
+    """Put terminal into a raw mode."""
+    mode = tcgetattr(fd)
+    mode[IFLAG] = mode[IFLAG] & ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON)
+    mode[OFLAG] = mode[OFLAG] & ~(OPOST)
+    mode[CFLAG] = mode[CFLAG] & ~(CSIZE | PARENB)
+    mode[CFLAG] = mode[CFLAG] | CS8
+    mode[LFLAG] = mode[LFLAG] & ~(ECHO | ICANON | IEXTEN | ISIG)
+    mode[CC][VMIN] = 1
+    mode[CC][VTIME] = 0
+    tcsetattr(fd, when, mode)
+
+def setcbreak(fd, when=TCSAFLUSH):
+    """Put terminal into a cbreak mode."""
+    mode = tcgetattr(fd)
+    mode[LFLAG] = mode[LFLAG] & ~(ECHO | ICANON)
+    mode[CC][VMIN] = 1
+    mode[CC][VTIME] = 0
+    tcsetattr(fd, when, mode)