From 97d36f069d3362cd09b481fba94ee1de01a1f51b Mon Sep 17 00:00:00 2001 From: Heinrich Schuchardt Date: Sun, 27 Dec 2020 14:47:50 +0100 Subject: [PATCH] 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 --- lib/efi_loader/efi_console.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/lib/efi_loader/efi_console.c b/lib/efi_loader/efi_console.c index 011accab78..705109596e 100644 --- a/lib/efi_loader/efi_console.c +++ b/lib/efi_loader/efi_console.c @@ -14,6 +14,7 @@ #include #include #include +#include #define EFI_COUT_MODE_2 2 #define EFI_MAX_COUT_MODE 3 @@ -688,6 +689,17 @@ static efi_status_t efi_cin_read_key(struct efi_key_data *key) 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