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efi_loader: escape key handling

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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>
This commit is contained in:
Heinrich Schuchardt 2020-12-27 14:47:50 +01:00
parent 5f9b537531
commit 9abb01af74
1 changed files with 12 additions and 0 deletions
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12
lib/efi_loader/efi_console.c
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@ -14,6 +14,7 @@
#include <env.h> #include <env.h>
#include <stdio_dev.h> #include <stdio_dev.h>
#include <video_console.h> #include <video_console.h>
#include <linux/delay.h>
#define EFI_COUT_MODE_2 2 #define EFI_COUT_MODE_2 2
#define EFI_MAX_COUT_MODE 3 #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) { switch (ch) {
case 0x1b: 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 * Xterm Control Sequences
* https://www.xfree86.org/4.8.0/ctlseqs.html * https://www.xfree86.org/4.8.0/ctlseqs.html