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boot: Query shift state as bios doesn't give it to us?

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This commit is contained in:
K. Lange 2023-04-11 20:52:52 +09:00
parent 2af556d9da
commit 9d0bdb876a
1 changed files with 4 additions and 30 deletions
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34
boot/kbd.c
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@ -127,39 +127,13 @@ int read_key(int * c) {
static int shift_state = 0;
int sc = read_scancode(0);
int shift = do_bios_call(4,2) & 0x3;
if (sc == 0xe0) {
*c = 0xe0;
return 1;
}
if (*c == 0xe0) {
*c = 0;
switch (sc) {
/* Keft left and right */
case 0x4B:
return shift_state ? 4 : 2;
case 0x4D:
return shift_state ? 5 : 3;
}
return 1;
}
switch (sc) {
/* Shift down */
case 0x2A:
case 0x36:
shift_state = 1;
return 1;
/* Shift up */
case 0xAA:
case 0xB6:
shift_state = 0;
return 1;
}
if (sc == 0x4B) return shift ? 4 : 2;
if (sc == 0x4D) return shift ? 5 : 3;
if (!(sc & 0x80)) {
*c = shift_state ? kbd_us_l2[sc] : kbd_us[sc];
*c = shift ? kbd_us_l2[sc] : kbd_us[sc];
return *c == 0;
}