Add support for EFI console modes.
Mode 0 is always 80x25 and present by EFI specification.
Mode 1 is always 80x50 and not mandatory.
Mode 2 and above is freely usable.
If the terminal can handle mode 1, we mark it as supported.
If the terminal size is greater than mode 0 and different than mode 1,
we install it as mode 2.
Modes can be switch with cout_set_mode.
Changes in V5:
Correctly detect mode before enabling mode 2.
Changes in V4:
Reset cursor positon on mode switch
Use local variables in console query code
Changes in V3:
Valid mode are 0 to EFIMode-1
Fix style
Changes in V2:
Add mode switch
Report only the modes that we support
Signed-off-by: Emmanuel Vadot <manu@bidouilliste.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
One of the basic EFI interfaces is the console interface. Using it an EFI
application can interface with the user. This patch implements an EFI console
interface using getc() and putc().
Today, we only implement text based consoles. We also convert the EFI Unicode
characters to UTF-8 on the fly, hoping that everyone managed to jump on the
train by now.
Signed-off-by: Alexander Graf <agraf@suse.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>
