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103 lines
3.4 KiB
103 lines
3.4 KiB
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Hans de Goede <hdegoede@redhat.com>
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Date: Wed, 6 Jun 2018 15:54:44 +0200
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Subject: [PATCH] EFI: console: Add grub_console_read_key_stroke() helper
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function
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This is a preparation patch for adding getkeystatus() support to the
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EFI console terminal input driver.
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We can get modifier status through the simple_text_input read_key_stroke
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method, but if a non-modifier key is (also) pressed the read_key_stroke
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call will consume that key from the firmware's queue.
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The new grub_console_read_key_stroke() helper buffers upto 1 key-stroke.
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If it has a non-modifier key buffered, it will return that one, if its
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buffer is empty, it will fills its buffer by getting a new key-stroke.
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If called with consume=1 it will empty its buffer after copying the
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key-data to the callers buffer, this is how getkey() will use it.
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If called with consume=0 it will keep the last key-stroke buffered, this
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is how getkeystatus() will call it. This means that if a non-modifier
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key gets pressed, repeated getkeystatus() calls will return the modifiers
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of that key-press until it is consumed by a getkey() call.
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Signed-off-by: Hans de Goede <hdegoede@redhat.com>
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---
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grub-core/term/efi/console.c | 51 ++++++++++++++++++++++++++++++++++----------
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1 file changed, 40 insertions(+), 11 deletions(-)
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diff --git a/grub-core/term/efi/console.c b/grub-core/term/efi/console.c
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index 051633d71..3d36c5c70 100644
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--- a/grub-core/term/efi/console.c
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+++ b/grub-core/term/efi/console.c
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@@ -157,27 +157,56 @@ grub_console_getkey_con (struct grub_term_input *term __attribute__ ((unused)))
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return grub_efi_translate_key(key);
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}
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+/*
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+ * When more then just modifiers are pressed, our getkeystatus() consumes a
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+ * press from the queue, this function buffers the press for the regular
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+ * getkey() so that it does not get lost.
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+ */
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+static int
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+grub_console_read_key_stroke (
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+ grub_efi_simple_text_input_ex_interface_t *text_input,
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+ grub_efi_key_data_t *key_data_ret, int *key_ret,
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+ int consume)
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+{
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+ static grub_efi_key_data_t key_data;
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+ grub_efi_status_t status;
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+ int key;
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+
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+ if (!text_input)
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+ return GRUB_ERR_EOF;
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+
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+ key = grub_efi_translate_key (key_data.key);
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+ if (key == GRUB_TERM_NO_KEY) {
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+ status = efi_call_2 (text_input->read_key_stroke, text_input, &key_data);
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+ if (status != GRUB_EFI_SUCCESS)
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+ return GRUB_ERR_EOF;
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+
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+ key = grub_efi_translate_key (key_data.key);
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+ }
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+
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+ *key_data_ret = key_data;
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+ *key_ret = key;
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+
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+ if (consume) {
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+ key_data.key.scan_code = 0;
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+ key_data.key.unicode_char = 0;
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+ }
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+
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+ return 0;
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+}
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+
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static int
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grub_console_getkey_ex(struct grub_term_input *term)
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{
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grub_efi_key_data_t key_data;
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- grub_efi_status_t status;
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grub_efi_uint32_t kss;
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int key = -1;
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- grub_efi_simple_text_input_ex_interface_t *text_input = term->data;
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-
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- status = efi_call_2 (text_input->read_key_stroke, text_input, &key_data);
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-
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- if (status != GRUB_EFI_SUCCESS)
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+ if (grub_console_read_key_stroke (term->data, &key_data, &key, 1) ||
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+ key == GRUB_TERM_NO_KEY)
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return GRUB_TERM_NO_KEY;
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kss = key_data.key_state.key_shift_state;
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- key = grub_efi_translate_key(key_data.key);
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-
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- if (key == GRUB_TERM_NO_KEY)
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- return GRUB_TERM_NO_KEY;
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-
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if (kss & GRUB_EFI_SHIFT_STATE_VALID)
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{
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if ((kss & GRUB_EFI_LEFT_SHIFT_PRESSED
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