efi_loader: escape key handling
Up to now the escape key was not correctly detected in UEFI applications.
We had to hit it twice for a single escape to be recognized.
Use a 10 ms delay to detect if we are dealing with the escape key or an
escape sequence.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/lib/efi_loader/efi_console.c b/lib/efi_loader/efi_console.c
index 011acca..7051095 100644
--- a/lib/efi_loader/efi_console.c
+++ b/lib/efi_loader/efi_console.c
@@ -14,6 +14,7 @@
#include <env.h>
#include <stdio_dev.h>
#include <video_console.h>
+#include <linux/delay.h>
#define EFI_COUT_MODE_2 2
#define EFI_MAX_COUT_MODE 3
@@ -689,6 +690,17 @@
switch (ch) {
case 0x1b:
/*
+ * If a second key is received within 10 ms, assume that we are
+ * dealing with an escape sequence. Otherwise consider this the
+ * escape key being hit. 10 ms is long enough to work fine at
+ * 1200 baud and above.
+ */
+ udelay(10000);
+ if (!tstc()) {
+ pressed_key.scan_code = 23;
+ break;
+ }
+ /*
* Xterm Control Sequences
* https://www.xfree86.org/4.8.0/ctlseqs.html
*/