change wsdisplay attribute type from long to uint32_t

miod explained it was initially a long as it was thought drivers may
need to allocate storage but in practice they don't need more than
32 bits for an attribute.

suggested and reviewed by miod@

Use the CD bit (Cursor Disable) in the cursor start register to properly
disable hardware cursor.

From NetBSD.

OK deraadt@

Remove the unused pcdisplay_mapchar_simple function in pcdisplay(4).

It has been unused since this code was imported from NetBSD.

OK mlarkin@

Fix SPL handling when PCDISPLAY_SOFTCURSOR is enabled.

Discovered, narrowed down, and tested by jmc@.
"definitely commit that" deraadt@, ok miod@

Sprinkle spltty around code which plays with either the video memory or
the backing store. The state of a VT is only coherent if both the active
flag and the backing store are in order, which is not the case during VT
switches.
This fixes display glitches occuring during VT switches if one of the
VT involved is doing a lot of tty updates.
Noticed by deraadt@ on a machine too fast for mere mortals.

ansify function definitions, and constify a few arrays while there.
no functional change.

Change the wsdisplay_emulops return types from void to int; emulops will now
return zero on success and nonzero on failure.
This commit only performs mechanical changes for the existing emulops to
always return zero.

Change the getchar wsdisplay_accessops function to not return a
display-dependent value, but instead fill a structure with the chaarcter
and a valid attribute, suitable for use with unpack_attr.

Adapt the wsmoused code to these changes, and remove all knowledge of
the text-mode style pc video attributes in it.

This will eventually allow wsmoused to be used on non-pcdisplay devices.

If option PCDISPLAY_SOFTCURSOR, force the hardware cursor off every time
we switch vt, so that the hardware cursor does not reappear after starting
X11, and switching to a text vt.

Spotted by jmc@

Make these pass -Wsign-compare

branches: 1.4.4;
Kernel support for console mouse functionality which will be controlled by
the wsmoused daemon (replacement for moused which was used with PCVT). Adds
a "getchar" method to the display drivers which returns the value of the
character currently under the cursor (e.g., so it may be inversed). From jbm@.

Still needs a bit of cleanup and improvement, especially X cohabitation
features. The pointer moves to fast as well. These sorts of issues will be
corrected in-tree.

allow listing and soon deleting fonts; aaron@ ok

$OpenBSD$

This driver supports PC display adapter hardware within the wscons(4)
console framework. It doesn't provide direct device driver entry points
but makes its functions available via the internal wsdisplay(4) interface.

The pcdisplay driver is indended as a minimal ``catch-all'' driver for
the different kinds of MDA or CGA compatible adapters. It doesn't support
multiple screens, nor colors or font loading.

From NetBSD. Contains routines used by the vga(4) and ega(4) drivers, etc.
This is more MI stuff in prepartion for wscons on i386 and alpha.

Use the CD bit (Cursor Disable) in the cursor start register to properly
disable hardware cursor.

From NetBSD.

OK deraadt@

Remove the unused pcdisplay_mapchar_simple function in pcdisplay(4).

It has been unused since this code was imported from NetBSD.

OK mlarkin@

Fix SPL handling when PCDISPLAY_SOFTCURSOR is enabled.

Discovered, narrowed down, and tested by jmc@.
"definitely commit that" deraadt@, ok miod@

Sprinkle spltty around code which plays with either the video memory or
the backing store. The state of a VT is only coherent if both the active
flag and the backing store are in order, which is not the case during VT
switches.
This fixes display glitches occuring during VT switches if one of the
VT involved is doing a lot of tty updates.
Noticed by deraadt@ on a machine too fast for mere mortals.

ansify function definitions, and constify a few arrays while there.
no functional change.

Change the wsdisplay_emulops return types from void to int; emulops will now
return zero on success and nonzero on failure.
This commit only performs mechanical changes for the existing emulops to
always return zero.

Change the getchar wsdisplay_accessops function to not return a
display-dependent value, but instead fill a structure with the chaarcter
and a valid attribute, suitable for use with unpack_attr.

Adapt the wsmoused code to these changes, and remove all knowledge of
the text-mode style pc video attributes in it.

This will eventually allow wsmoused to be used on non-pcdisplay devices.

If option PCDISPLAY_SOFTCURSOR, force the hardware cursor off every time
we switch vt, so that the hardware cursor does not reappear after starting
X11, and switching to a text vt.

Spotted by jmc@

Make these pass -Wsign-compare

branches: 1.4.4;
Kernel support for console mouse functionality which will be controlled by
the wsmoused daemon (replacement for moused which was used with PCVT). Adds
a "getchar" method to the display drivers which returns the value of the
character currently under the cursor (e.g., so it may be inversed). From jbm@.

Still needs a bit of cleanup and improvement, especially X cohabitation
features. The pointer moves to fast as well. These sorts of issues will be
corrected in-tree.

allow listing and soon deleting fonts; aaron@ ok

$OpenBSD$

This driver supports PC display adapter hardware within the wscons(4)
console framework. It doesn't provide direct device driver entry points
but makes its functions available via the internal wsdisplay(4) interface.

The pcdisplay driver is indended as a minimal ``catch-all'' driver for
the different kinds of MDA or CGA compatible adapters. It doesn't support
multiple screens, nor colors or font loading.

From NetBSD. Contains routines used by the vga(4) and ega(4) drivers, etc.
This is more MI stuff in prepartion for wscons on i386 and alpha.