vgabios: Support emulated text in gfx_read_char()

When emulating text mode on "coreboot framebuffer" SeaVGABIOS, return
a foreground and background attribute from gfx_read_char() and prefer
returning a space character (instead of null) on blank cells.

This also returns the foreground color (instead of always returning
zero) for regular graphics mode gfx_read_char() calls.  This seems
fine as tests show other vgabios implementations also return various
values here.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
1 file changed
tree: a29d88c9c153e163e9bb2d6034e2c2e182d2e5c7
  1. docs/
  2. scripts/
  3. src/
  4. vgasrc/
  5. .gitignore
  6. COPYING
  7. COPYING.LESSER
  8. Makefile
  9. README