diff options
| author | Heinrich Schuchardt <xypron.glpk@gmx.de> | 2020-12-27 14:47:50 +0100 |
|---|---|---|
| committer | Heinrich Schuchardt <xypron.glpk@gmx.de> | 2020-12-29 02:09:04 +0100 |
| commit | 9abb01af749f61de8467de05a27f7262fb1dec7b (patch) | |
| tree | d6aad17e16a83007e3b7c9de7ee8594b46d5b40e | |
| parent | 5f9b53753118ade7b502bce9866ea527a8a86372 (diff) | |
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>
| -rw-r--r-- | lib/efi_loader/efi_console.c | 12 |
1 files changed, 12 insertions, 0 deletions
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 <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 @@ 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 */ |