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Kernel: Add a beep() syscall that beeps the PC speaker.

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Hook this up in Terminal so that the '\a' character generates a beep.
Finally emit an '\a' character in the shell line editing code when
backspacing at the start of the line.
This commit is contained in:
Andreas Kling 2019-05-15 21:40:41 +02:00
parent dcf490ecab
commit 3cba2a8a78
14 changed files with 82 additions and 25 deletions
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20
Kernel/i8253.cpp
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@ -37,26 +37,6 @@ asm(
" iret\n"
);
/* Timer related ports */
#define TIMER0_CTL 0x40
#define TIMER1_CTL 0x41
#define TIMER2_CTL 0x42
#define PIT_CTL 0x43
/* Building blocks for PIT_CTL */
#define TIMER0_SELECT 0x00
#define TIMER1_SELECT 0x40
#define TIMER2_SELECT 0x80
#define MODE_COUNTDOWN 0x00
#define MODE_ONESHOT 0x02
#define MODE_RATE 0x04
#define MODE_SQUARE_WAVE 0x06
#define WRITE_WORD 0x30
#define BASE_FREQUENCY 1193182
static dword s_ticks_this_second;
static dword s_seconds_since_boot;