tree 25e4fb9f3984bd2cd9621fb599e964975fad2028
parent be721696cac9d66566d59b205ee573ecb2f7c35b
author H. Peter Anvin <hpa@linux.intel.com> 1237420445 -0700
committer H. Peter Anvin <hpa@linux.intel.com> 1237420445 -0700

x86, setup: fix the setting of 480-line VGA modes

Impact: fix rarely-used feature

The VGA Miscellaneous Output Register is read from address 0x3CC but
written to address 0x3C2.  This was missed when this code was
converted from assembly to C.  While we're at it, clean up the code by
making the overflow bits and the math used to set the bits explicit.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>