From 275be13b587638b8a31884ca4d93ae0d0e9132bb Mon Sep 17 00:00:00 2001
From: Rex Jolliff <rex@lvcablemodem.com>
Date: Wed, 10 Mar 1999 06:39:59 +0000
Subject: [PATCH] Eric's beep driver and changes for same

svn path=/trunk/; revision=286
---
 reactos/include/ddk/ntddbeep.h  | 15 +++++++
 reactos/ntoskrnl/hal/x86/beep.c | 70 +++++++++++++++++++++++++++++++++
 2 files changed, 85 insertions(+)
 create mode 100644 reactos/include/ddk/ntddbeep.h
 create mode 100644 reactos/ntoskrnl/hal/x86/beep.c

diff --git a/reactos/include/ddk/ntddbeep.h b/reactos/include/ddk/ntddbeep.h
new file mode 100644
index 00000000000..c73e8f601e9
--- /dev/null
+++ b/reactos/include/ddk/ntddbeep.h
@@ -0,0 +1,15 @@
+#ifndef _BEEP_H_INCLUDED_
+#define _BEEP_H_INCLUDED_
+
+#define IOCTL_BEEP_SET  CTL_CODE(FILE_DEVICE_BEEP,0,METHOD_BUFFERED,FILE_ANY_ACCESS)
+
+typedef struct tagBEEP_SET_PARAMETERS
+{
+    ULONG Frequency;
+    ULONG Duration;
+} BEEP_SET_PARAMETERS, *PBEEP_SET_PARAMETERS;
+
+#define BEEP_FREQUENCY_MINIMUM  0x25
+#define BEEP_FREQUENCY_MAXIMUM  0x7FFF
+
+#endif /* _BEEP_H_INCLUDED_ */
diff --git a/reactos/ntoskrnl/hal/x86/beep.c b/reactos/ntoskrnl/hal/x86/beep.c
new file mode 100644
index 00000000000..6aa9af703e0
--- /dev/null
+++ b/reactos/ntoskrnl/hal/x86/beep.c
@@ -0,0 +1,70 @@
+/*
+ * COPYRIGHT:       See COPYING in the top level directory
+ * PROJECT:         ReactOS kernel
+ * FILE:            ntoskrnl/hal/x86/beep.c
+ * PURPOSE:         Speaker function (it's only one)
+ * PROGRAMMER:      Eric Kohl (ekohl@abo.rhein-zeitung.de)
+ * UPDATE HISTORY:
+ *                  Created 31/01/99
+ */
+
+/* INCLUDES *****************************************************************/
+
+#include <ddk/ntddk.h>
+
+//#include <internal/debug.h>
+#include <internal/i386/io.h>
+
+/* CONSTANTS *****************************************************************/
+
+#define TIMER2     0x42
+#define TIMER3     0x43
+#define PORT_B     0x61
+#define CLOCKFREQ  1193167
+
+
+/* FUNCTIONS *****************************************************************/
+/*
+ * FUNCTION: Beeps the speaker.
+ * ARGUMENTS:
+ *       Frequency = If 0, the speaker will be switched off, otherwise
+ *                   the speaker beeps with the specified frequency.
+ */
+
+BOOLEAN
+HalMakeBeep(ULONG Frequency)
+{
+    /* save flags and disable interrupts */
+    __asm__("pushf\n\t" \
+            "cli\n\t");
+
+    /* speaker off */
+    outb_p(PORT_B, inb_p(PORT_B) & 0xFC);
+
+    if (Frequency)
+    {
+        DWORD Divider = CLOCKFREQ / Frequency;
+
+        if (Divider > 0x10000)
+        {
+            /* restore flags */
+            __asm__("popf\n\t");
+
+            return FALSE;
+        }
+
+        /* set timer divider */
+        outb_p(TIMER3, 0xB6);
+        outb_p(TIMER2, (UCHAR)(Divider & 0xFF));
+        outb_p(TIMER2, (UCHAR)((Divider>>8) & 0xFF));
+
+        /* speaker on */
+        outb_p(PORT_B, inb_p(PORT_B) | 0x03);
+    }
+
+    /* restore flags */
+    __asm__("popf\n\t");
+
+    return TRUE;
+}
+