Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

isa-serial.hh don't need to include vga.hh, but it's required on
console.cc, so move it.

Signed-off-by: Takuya ASADA <syuu@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

The current initialization is to something like 5 bit words, which truncates
everything to control characters on VMware.  QEMU somehow ignores the word
size.

Fix to initialize the serial port to 8N1, yielding useful output.

Signed-off-by: Avi Kivity <avi@cloudius-systems.com>

Add Cloudius copyright and license statement to drivers/*.

A couple of header files were based on Linux's BSD-licensed header files
(e.g., include/uapi/linux/virtio_net.h) so they included the BSD license,
but not any copyright statement, so we can just replace that by our own
statement of the BSD license.

Our console works well with KVM, that redirects the serial to stdio. In Xen,
this seems not to work very well (some documentation sources - not all - lists
'serial="stdio"' as a valid option, but it doesn't really work). In that case,
LFs are not automatically translated into CRLF and the terminal output is totally
borked.

This is obviously not exclusive to Xen: by changing our qemu command line to run
a pts instead of stdio, and then connecting to that pts, the same thing happens.

This patch modifies our console's write() function to respect the termios ONLCR
flag, which is now set by default. When write() sees a newline character and
this flag is set we output a CF before any LF.

The termios structure is left outside the specific console, and we pass a
pointer down to it. Our pre-console implementation of simple_write outputs CRs
unconditionally.

The normal stdio serial still works. Telnet still works.

Our console write() takes 3 parameters. The last one controls whether or not we
will issue a newline at the end of input. If it is true, we will call the
console's implementation of newline(). It is always passed as false, though.
Remove it and fix the callers.

Fix two errors in IsaSerialConsole::reset(). The visible effect of these
errors was a spurious \001 (^A) character which always appeared at the
beginning of every OSV's run output.

The two errors were:
1. The DLAB bit on the LCR was incorrectly set (a spurious
   "& LCR_DIVISOR_LATCH_ACCESS_BIT" appeared in the code), causing the
   next outb(1) to go to the output register (and output a "1" character)
   instead of setting the baud rate.
2. When writing the FCR register, the "ioport + " base forgotten.

I took the opportunity and added better names for the constants,
removed a couple of duplicate constants, and added comments.

Rather than polling.

Polling only, no interrupt yet.

Now our Isa serial device can read characters.
Using it by calling readln(char *msg, size_t len);
Note that the calls block until the len input chars or a newline.

This is the low-level console abstraction and should deal in the
char * hardware format.  The upper layer (debug.cc) already handles
all conversion from std::string and boost formats.

At the moment it can only print to the console.