New terminal outputs using serial: morse and spkmodem.

include/grub/i386/pit.h

@@ -22,6 +22,84 @@
 #include <grub/types.h>
 #include <grub/err.h>
 
+enum
+  {
+    /* The PIT channel value ports.  You can write to and read from them.
+       Do not mess with timer 0 or 1.  */
+    GRUB_PIT_COUNTER_0 = 0x40,
+    GRUB_PIT_COUNTER_1 = 0x41,
+    GRUB_PIT_COUNTER_2 = 0x42,
+    /* The PIT control port.  You can only write to it.  Do not mess with
+       timer 0 or 1.  */
+    GRUB_PIT_CTRL = 0x43,
+    /* The speaker port.  */
+    GRUB_PIT_SPEAKER_PORT = 0x61,
+  };
+
+
+/* The speaker port.  */
+enum
+  {
+    /* If 0, follow state of SPEAKER_DATA bit, otherwise enable output
+       from timer 2.  */
+    GRUB_PIT_SPK_TMR2 = 0x01,
+    /* If SPEAKER_TMR2 is not set, this provides direct input into the
+       speaker.  Otherwise, this enables or disables the output from the
+       timer.  */
+    GRUB_PIT_SPK_DATA = 0x02,
+
+    GRUB_PIT_SPK_TMR2_LATCH = 0x20
+  };
+
+/* The PIT control port.  You can only write to it.  Do not mess with
+   timer 0 or 1.  */
+enum
+  {
+    GRUB_PIT_CTRL_SELECT_MASK = 0xc0,
+    GRUB_PIT_CTRL_SELECT_0 = 0x00,
+    GRUB_PIT_CTRL_SELECT_1 = 0x40,
+    GRUB_PIT_CTRL_SELECT_2 = 0x80,
+
+    /* Read and load control.  */
+    GRUB_PIT_CTRL_READLOAD_MASK= 0x30,
+    GRUB_PIT_CTRL_COUNTER_LATCH = 0x00,	/* Hold timer value until read.  */
+    GRUB_PIT_CTRL_READLOAD_LSB = 0x10,	/* Read/load the LSB.  */
+    GRUB_PIT_CTRL_READLOAD_MSB = 0x20,	/* Read/load the MSB.  */
+    GRUB_PIT_CTRL_READLOAD_WORD = 0x30,	/* Read/load the LSB then the MSB.  */
+
+    /* Mode control.  */
+    GRUB_PIT_CTRL_MODE_MASK = 0x0e,
+    /* Interrupt on terminal count.  Setting the mode sets output to low.
+       When counter is set and terminated, output is set to high.  */
+    GRUB_PIT_CTRL_INTR_ON_TERM = 0x00,
+    /* Programmable one-shot.  When loading counter, output is set to
+       high.  When counter terminated, output is set to low.  Can be
+       triggered again from that point on by setting the gate pin to
+       high.  */
+    GRUB_PIT_CTRL_PROGR_ONE_SHOT = 0x02,
+
+    /* Rate generator.  Output is low for one period of the counter, and
+       high for the other.  */
+    GRUB_PIT_CTRL_RATE_GEN = 0x04,
+
+    /* Square wave generator.  Output is low for one half of the period,
+       and high for the other half.  */
+    GRUB_PIT_CTRL_SQUAREWAVE_GEN = 0x06,
+    /* Software triggered strobe.  Setting the mode sets output to high.
+       When counter is set and terminated, output is set to low.  */
+    GRUB_PIT_CTRL_SOFTSTROBE = 0x08,
+
+    /* Hardware triggered strobe.  Like software triggered strobe, but
+       only starts the counter when the gate pin is set to high.  */
+    GRUB_PIT_CTRL_HARDSTROBE = 0x0a,
+
+
+    /* Count mode.  */
+    GRUB_PIT_CTRL_COUNT_MASK = 0x01,
+    GRUB_PIT_CTRL_COUNT_BINARY = 0x00,	/* 16-bit binary counter.  */
+    GRUB_PIT_CTRL_COUNT_BCD = 0x01	/* 4-decade BCD counter.  */
+  };
+
 void EXPORT_FUNC(grub_pit_wait) (grub_uint16_t tics);
 
 #endif /* ! KERNEL_CPU_PIT_HEADER */

include/grub/speaker.h

@@ -0,0 +1,47 @@
+#ifndef GRUB_SPEAKER_HEADER
+#define GRUB_SPEAKER_HEADER 1
+
+#include <grub/cpu/io.h>
+#include <grub/i386/pit.h>
+
+/* The frequency of the PIT clock.  */
+#define GRUB_SPEAKER_PIT_FREQUENCY		0x1234dd
+
+static inline void
+grub_speaker_beep_off (void)
+{
+  unsigned char status;
+
+  status = grub_inb (GRUB_PIT_SPEAKER_PORT);
+  grub_outb (status & ~(GRUB_PIT_SPK_TMR2 | GRUB_PIT_SPK_DATA),
+	     GRUB_PIT_SPEAKER_PORT);
+}
+
+static inline void
+grub_speaker_beep_on (grub_uint16_t pitch)
+{
+  unsigned char status;
+  unsigned int counter;
+
+  if (pitch < 20)
+    pitch = 20;
+  else if (pitch > 20000)
+    pitch = 20000;
+
+  counter = GRUB_SPEAKER_PIT_FREQUENCY / pitch;
+
+  /* Program timer 2.  */
+  grub_outb (GRUB_PIT_CTRL_SELECT_2
+	     | GRUB_PIT_CTRL_READLOAD_WORD
+	     | GRUB_PIT_CTRL_SQUAREWAVE_GEN
+	     | GRUB_PIT_CTRL_COUNT_BINARY, GRUB_PIT_CTRL);
+  grub_outb (counter & 0xff, GRUB_PIT_COUNTER_2);		/* LSB */
+  grub_outb ((counter >> 8) & 0xff, GRUB_PIT_COUNTER_2);	/* MSB */
+
+  /* Start speaker.  */
+  status = grub_inb (GRUB_PIT_SPEAKER_PORT);
+  grub_outb (status | GRUB_PIT_SPK_TMR2 | GRUB_PIT_SPK_DATA,
+	     GRUB_PIT_SPEAKER_PORT);
+}
+
+#endif