linux-stable/Documentation/admin-guide/vga-softcursor.rst
Linus Torvalds 5266e70335 TTY/Serial patches for 4.10-rc1
Here's the tty/serial patchset for 4.10-rc1.
 
 It's been a quiet kernel cycle for this subsystem, just a small number
 of changes.  A few new serial drivers, and some cleanups to the old
 vgacon logic, and other minor serial driver changes as well.
 
 All of these have been in linux-next for a while with no reported
 issues.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'tty-4.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty

Pull tty/serial updates from Greg KH:
 "Here's the tty/serial patchset for 4.10-rc1.

  It's been a quiet kernel cycle for this subsystem, just a small number
  of changes. A few new serial drivers, and some cleanups to the old
  vgacon logic, and other minor serial driver changes as well.

  All of these have been in linux-next for a while with no reported
  issues"

* tag 'tty-4.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (54 commits)
  serial: 8250_mid fix calltrace when hotplug 8250 serial controller
  console: Move userspace I/O out of console_lock to fix lockdep warning
  tty: nozomi: avoid sprintf buffer overflow
  serial: 8250_pci: Detach low-level driver during PCI error recovery
  serial: core: don't check port twice in a row
  mxs-auart: count FIFO overrun errors
  serial: 8250_dw: Add support for IrDA SIR mode
  serial: 8250: Expose set_ldisc function
  serial: 8250: Add IrDA to UART capabilities
  serial: 8250_dma: power off device after TX is done
  serial: 8250_port: export serial8250_rpm_{get|put}_tx()
  serial: sunsu: Free memory when probe fails
  serial: sunhv: Free memory when remove() is called
  vt: fix Scroll Lock LED trigger name
  tty: typo in comments in drivers/tty/vt/keyboard.c
  tty: amba-pl011: Add earlycon support for SBSA UART
  tty: nozomi: use permission-specific DEVICE_ATTR variants
  tty: serial: Make the STM32 serial port depend on it's arch
  serial: ifx6x60: Free memory when probe fails
  serial: ioc4_serial: Free memory when kzalloc fails during probe
  ...
2016-12-13 11:18:24 -08:00

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Software cursor for VGA
=======================
by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>
and Martin Mares <mj@atrey.karlin.mff.cuni.cz>
Linux now has some ability to manipulate cursor appearance. Normally,
you can set the size of hardware cursor. You can now play a few new
tricks: you can make your cursor look like a non-blinking red block,
make it inverse background of the character it's over or to highlight
that character and still choose whether the original hardware cursor
should remain visible or not. There may be other things I have never
thought of.
The cursor appearance is controlled by a ``<ESC>[?1;2;3c`` escape sequence
where 1, 2 and 3 are parameters described below. If you omit any of them,
they will default to zeroes.
first Parameter
specifies cursor size::
0=default
1=invisible
2=underline,
...
8=full block
+ 16 if you want the software cursor to be applied
+ 32 if you want to always change the background color
+ 64 if you dislike having the background the same as the
foreground.
Highlights are ignored for the last two flags.
second parameter
selects character attribute bits you want to change
(by simply XORing them with the value of this parameter). On standard
VGA, the high four bits specify background and the low four the
foreground. In both groups, low three bits set color (as in normal
color codes used by the console) and the most significant one turns
on highlight (or sometimes blinking -- it depends on the configuration
of your VGA).
third parameter
consists of character attribute bits you want to set.
Bit setting takes place before bit toggling, so you can simply clear a
bit by including it in both the set mask and the toggle mask.
Examples
--------
To get normal blinking underline, use::
echo -e '\033[?2c'
To get blinking block, use::
echo -e '\033[?6c'
To get red non-blinking block, use::
echo -e '\033[?17;0;64c'