Blame SOURCES/0183-EFI-console-Add-grub_console_read_key_stroke-helper-.patch

8631a2
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
8631a2
From: Hans de Goede <hdegoede@redhat.com>
8631a2
Date: Wed, 6 Jun 2018 15:54:44 +0200
8631a2
Subject: [PATCH] EFI: console: Add grub_console_read_key_stroke() helper
8631a2
 function
8631a2
8631a2
This is a preparation patch for adding getkeystatus() support to the
8631a2
EFI console terminal input driver.
8631a2
8631a2
We can get modifier status through the simple_text_input read_key_stroke
8631a2
method, but if a non-modifier key is (also) pressed the read_key_stroke
8631a2
call will consume that key from the firmware's queue.
8631a2
8631a2
The new grub_console_read_key_stroke() helper buffers upto 1 key-stroke.
8631a2
If it has a non-modifier key buffered, it will return that one, if its
8631a2
buffer is empty, it will fills its buffer by getting a new key-stroke.
8631a2
8631a2
If called with consume=1 it will empty its buffer after copying the
8631a2
key-data to the callers buffer, this is how getkey() will use it.
8631a2
8631a2
If called with consume=0 it will keep the last key-stroke buffered, this
8631a2
is how getkeystatus() will call it. This means that if a non-modifier
8631a2
key gets pressed, repeated getkeystatus() calls will return the modifiers
8631a2
of that key-press until it is consumed by a getkey() call.
8631a2
8631a2
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
8631a2
---
8631a2
 grub-core/term/efi/console.c | 51 ++++++++++++++++++++++++++++++++++----------
8631a2
 1 file changed, 40 insertions(+), 11 deletions(-)
8631a2
8631a2
diff --git a/grub-core/term/efi/console.c b/grub-core/term/efi/console.c
b32e65
index 051633d71..3d36c5c70 100644
8631a2
--- a/grub-core/term/efi/console.c
8631a2
+++ b/grub-core/term/efi/console.c
8631a2
@@ -157,27 +157,56 @@ grub_console_getkey_con (struct grub_term_input *term __attribute__ ((unused)))
8631a2
   return grub_efi_translate_key(key);
8631a2
 }
8631a2
 
8631a2
+/*
8631a2
+ * When more then just modifiers are pressed, our getkeystatus() consumes a
8631a2
+ * press from the queue, this function buffers the press for the regular
8631a2
+ * getkey() so that it does not get lost.
8631a2
+ */
8631a2
+static int
8631a2
+grub_console_read_key_stroke (
8631a2
+                   grub_efi_simple_text_input_ex_interface_t *text_input,
8631a2
+                   grub_efi_key_data_t *key_data_ret, int *key_ret,
8631a2
+                   int consume)
8631a2
+{
8631a2
+  static grub_efi_key_data_t key_data;
8631a2
+  grub_efi_status_t status;
8631a2
+  int key;
8631a2
+
8631a2
+  if (!text_input)
8631a2
+    return GRUB_ERR_EOF;
8631a2
+
8631a2
+  key = grub_efi_translate_key (key_data.key);
8631a2
+  if (key == GRUB_TERM_NO_KEY) {
8631a2
+    status = efi_call_2 (text_input->read_key_stroke, text_input, &key_data);
8631a2
+    if (status != GRUB_EFI_SUCCESS)
8631a2
+      return GRUB_ERR_EOF;
8631a2
+
8631a2
+    key = grub_efi_translate_key (key_data.key);
8631a2
+  }
8631a2
+
8631a2
+  *key_data_ret = key_data;
8631a2
+  *key_ret = key;
8631a2
+
8631a2
+  if (consume) {
8631a2
+    key_data.key.scan_code = 0;
8631a2
+    key_data.key.unicode_char = 0;
8631a2
+  }
8631a2
+
8631a2
+  return 0;
8631a2
+}
8631a2
+
8631a2
 static int
8631a2
 grub_console_getkey_ex(struct grub_term_input *term)
8631a2
 {
8631a2
   grub_efi_key_data_t key_data;
8631a2
-  grub_efi_status_t status;
8631a2
   grub_efi_uint32_t kss;
8631a2
   int key = -1;
8631a2
 
8631a2
-  grub_efi_simple_text_input_ex_interface_t *text_input = term->data;
8631a2
-
8631a2
-  status = efi_call_2 (text_input->read_key_stroke, text_input, &key_data);
8631a2
-
8631a2
-  if (status != GRUB_EFI_SUCCESS)
8631a2
+  if (grub_console_read_key_stroke (term->data, &key_data, &key, 1) ||
8631a2
+      key == GRUB_TERM_NO_KEY)
8631a2
     return GRUB_TERM_NO_KEY;
8631a2
 
8631a2
   kss = key_data.key_state.key_shift_state;
8631a2
-  key = grub_efi_translate_key(key_data.key);
8631a2
-
8631a2
-  if (key == GRUB_TERM_NO_KEY)
8631a2
-    return GRUB_TERM_NO_KEY;
8631a2
-
8631a2
   if (kss & GRUB_EFI_SHIFT_STATE_VALID)
8631a2
     {
8631a2
       if ((kss & GRUB_EFI_LEFT_SHIFT_PRESSED