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efi/console: Implement getkeystatus() support 

Implement getkeystatus() support in the EFI console driver.

This is needed because the logic to determine if a key was pressed to make
the menu countdown stop will be changed by a later patch to also take into
account the SHIFT key being held down.

For this reason the EFI console driver has to support getkeystatus() to
allow detecting that event.

Note that if a non-modifier key gets pressed and repeated calls to
getkeystatus() are made then it will return the modifier status at the
time of the non-modifier key, until that key-press gets consumed by a
getkey() call.

This is a side-effect of how the EFI simple-text-input protocol works
and cannot be avoided.

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 commit is contained in:
Hans de Goede 2020-04-15 12:26:20 +02:00 committed by Daniel Kiper
parent 8bab36af60
commit ea138d11be
1 changed files with 34 additions and 0 deletions
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34
grub-core/term/efi/console.c
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@ -260,6 +260,39 @@ grub_console_getkey_ex (struct grub_term_input *term)
return key;
}
static int
grub_console_getkeystatus (struct grub_term_input *term)
{
grub_efi_key_data_t key_data;
grub_efi_uint32_t kss;
int key, mods = 0;
if (grub_efi_is_finished)
return 0;
if (grub_console_read_key_stroke (term->data, &key_data, &key, 0))
return 0;
kss = key_data.key_state.key_shift_state;
if (kss & GRUB_EFI_SHIFT_STATE_VALID)
{
if (kss & GRUB_EFI_LEFT_SHIFT_PRESSED)
mods |= GRUB_TERM_STATUS_LSHIFT;
if (kss & GRUB_EFI_RIGHT_SHIFT_PRESSED)
mods |= GRUB_TERM_STATUS_RSHIFT;
if (kss & GRUB_EFI_LEFT_ALT_PRESSED)
mods |= GRUB_TERM_STATUS_LALT;
if (kss & GRUB_EFI_RIGHT_ALT_PRESSED)
mods |= GRUB_TERM_STATUS_RALT;
if (kss & GRUB_EFI_LEFT_CONTROL_PRESSED)
mods |= GRUB_TERM_STATUS_LCTRL;
if (kss & GRUB_EFI_RIGHT_CONTROL_PRESSED)
mods |= GRUB_TERM_STATUS_RCTRL;
}
return mods;
}
static grub_err_t
grub_efi_console_input_init (struct grub_term_input *term)
{
@ -372,6 +405,7 @@ static struct grub_term_input grub_console_term_input =
{
.name = "console",
.getkey = grub_console_getkey,
.getkeystatus = grub_console_getkeystatus,
.init = grub_efi_console_input_init,
};