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This is a preparatory patch for adding getkeystatus() support to the EFI console driver. We can get modifier status through the simple_text_input read_key_stroke() method, but if a non-modifier key is (also) pressed the read_key_stroke() call will consume that key from the firmware's queue. The new grub_console_read_key_stroke() helper buffers upto 1 key-stroke. If it has a non-modifier key buffered, it will return that one, if its buffer is empty, it will fills its buffer by getting a new key-stroke. If called with consume=1 it will empty its buffer after copying the key-data to the callers buffer, this is how getkey() will use it. If called with consume=0 it will keep the last key-stroke buffered, this is how getkeystatus() will call it. This means that if a non-modifier key gets pressed, repeated getkeystatus() calls will return the modifiers of that key-press until it is consumed by a getkey() call. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Javier Martinez Canillas <javierm@redhat.com> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This is GRUB 2, the second version of the GRand Unified Bootloader. GRUB 2 is rewritten from scratch to make GNU GRUB cleaner, safer, more robust, more powerful, and more portable. See the file NEWS for a description of recent changes to GRUB 2. See the file INSTALL for instructions on how to build and install the GRUB 2 data and program files. Please visit the official web page of GRUB 2, for more information. The URL is <http://www.gnu.org/software/grub/grub.html>. More extensive documentation is available in the Info manual, accessible using 'info grub' after building and installing GRUB 2. There are a number of important user-visible differences from the first version of GRUB, now known as GRUB Legacy. For a summary, please see: info grub Introduction 'Changes from GRUB Legacy'