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grub2/0111-New-terminal-outputs-using-serial-morse-and-spkmodem.patch
Peter Jones f74b50e380 Rebase to upstream, fix a pile of bugs. The usual. 
Signed-off-by: Peter Jones <pjones@redhat.com>
2013-06-12 15:37:08 -04:00

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From ded439de5b72d33474f96fbc08b9687a76c938ac Mon Sep 17 00:00:00 2001
From: Vladimir 'phcoder' Serbinenko <phcoder@gmail.com>
Date: Wed, 16 Jan 2013 20:39:54 +0100
Subject: [PATCH 111/482] New terminal outputs using serial: morse and
spkmodem.
---
ChangeLog | 4 ++
docs/grub.texi | 24 +++++--
grub-core/Makefile.core.def | 12 ++++
grub-core/commands/i386/pc/play.c | 109 ++-----------------------------
grub-core/kern/i386/pit.c | 35 ++++------
grub-core/term/morse.c | 131 ++++++++++++++++++++++++++++++++++++++
grub-core/term/spkmodem.c | 106 ++++++++++++++++++++++++++++++
include/grub/i386/pit.h | 78 +++++++++++++++++++++++
include/grub/speaker.h | 47 ++++++++++++++
util/spkmodem-recv.c | 98 ++++++++++++++++++++++++++++
10 files changed, 512 insertions(+), 132 deletions(-)
create mode 100644 grub-core/term/morse.c
create mode 100644 grub-core/term/spkmodem.c
create mode 100644 include/grub/speaker.h
create mode 100644 util/spkmodem-recv.c
diff --git a/ChangeLog b/ChangeLog
index 96aca66..f1c53e3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
2013-01-16 Vladimir Serbinenko <phcoder@gmail.com>
+ New terminal outputs using serial: morse and spkmodem.
+
+2013-01-16 Vladimir Serbinenko <phcoder@gmail.com>
+
Improve bidi handling in entry editor.
2013-01-16 Vladimir Serbinenko <phcoder@gmail.com>
diff --git a/docs/grub.texi b/docs/grub.texi
index e75bae9..efedd27 100644
--- a/docs/grub.texi
+++ b/docs/grub.texi
@@ -1229,9 +1229,9 @@ Select the terminal input device. You may select multiple devices here,
separated by spaces.
Valid terminal input names depend on the platform, but may include
-@samp{console} (PC BIOS and EFI consoles), @samp{serial} (serial terminal),
-@samp{ofconsole} (Open Firmware console), @samp{at_keyboard} (PC AT
-keyboard, mainly useful with Coreboot), or @samp{usb_keyboard} (USB keyboard
+@samp{console} (native platform console), @samp{serial} (serial terminal),
+@samp{serial_<port>} (serial terminal with explicit port selection),
+@samp{at_keyboard} (PC AT keyboard), or @samp{usb_keyboard} (USB keyboard
using the HID Boot Protocol, for cases where the firmware does not handle
this).
@@ -1242,9 +1242,21 @@ Select the terminal output device. You may select multiple devices here,
separated by spaces.
Valid terminal output names depend on the platform, but may include
-@samp{console} (PC BIOS and EFI consoles), @samp{serial} (serial terminal),
-@samp{gfxterm} (graphics-mode output), @samp{ofconsole} (Open Firmware
-console), or @samp{vga_text} (VGA text output, mainly useful with Coreboot).
+@samp{console} (native platform console), @samp{serial} (serial terminal),
+@samp{serial_<port>} (serial terminal with explicit port selection),
+@samp{gfxterm} (graphics-mode output), @samp{vga_text} (VGA text output),
+@samp{mda_text} (MDA text output), @samp{morse} (Morse-coding using system
+beeper) or @samp{spkmodem} (simple data protocol using system speaker).
+
+@samp{spkmodem} is useful when no serial port is available. Connect the output
+of sending system (where GRUB is running) to line-in of receiving system
+(usually developper machine).
+On receiving system compile @samp{spkmodem-recv} from
+@samp{util/spkmodem-recv.c} and run:
+
+@example
+parecord --channels=1 --rate=48000 --format=s16le | ./spkmodem-recv
+@end example
The default is to use the platform's native terminal output.
diff --git a/grub-core/Makefile.core.def b/grub-core/Makefile.core.def
index f4dd645..baf80b8 100644
--- a/grub-core/Makefile.core.def
+++ b/grub-core/Makefile.core.def
@@ -779,6 +779,18 @@ module = {
};
module = {
+ name = spkmodem;
+ x86 = term/spkmodem.c;
+ enable = x86;
+};
+
+module = {
+ name = morse;
+ x86 = term/morse.c;
+ enable = x86;
+};
+
+module = {
name = probe;
common = commands/probe.c;
};
diff --git a/grub-core/commands/i386/pc/play.c b/grub-core/commands/i386/pc/play.c
index 10a0181..40798c9 100644
--- a/grub-core/commands/i386/pc/play.c
+++ b/grub-core/commands/i386/pc/play.c
@@ -28,80 +28,12 @@
#include <grub/command.h>
#include <grub/i18n.h>
#include <grub/time.h>
+#include <grub/speaker.h>
GRUB_MOD_LICENSE ("GPLv3+");
#define BASE_TEMPO (60 * 1000)
-/* The speaker port. */
-#define SPEAKER 0x61
-
-/* If 0, follow state of SPEAKER_DATA bit, otherwise enable output
- from timer 2. */
-#define SPEAKER_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. */
-#define SPEAKER_DATA 0x02
-
-/* The PIT channel value ports. You can write to and read from them.
- Do not mess with timer 0 or 1. */
-#define PIT_COUNTER_0 0x40
-#define PIT_COUNTER_1 0x41
-#define PIT_COUNTER_2 0x42
-
-/* The frequency of the PIT clock. */
-#define PIT_FREQUENCY 0x1234dd
-
-/* The PIT control port. You can only write to it. Do not mess with
- timer 0 or 1. */
-#define PIT_CTRL 0x43
-#define PIT_CTRL_SELECT_MASK 0xc0
-#define PIT_CTRL_SELECT_0 0x00
-#define PIT_CTRL_SELECT_1 0x40
-#define PIT_CTRL_SELECT_2 0x80
-
-/* Read and load control. */
-#define PIT_CTRL_READLOAD_MASK 0x30
-#define PIT_CTRL_COUNTER_LATCH 0x00 /* Hold timer value until read. */
-#define PIT_CTRL_READLOAD_LSB 0x10 /* Read/load the LSB. */
-#define PIT_CTRL_READLOAD_MSB 0x20 /* Read/load the MSB. */
-#define PIT_CTRL_READLOAD_WORD 0x30 /* Read/load the LSB then the MSB. */
-
-/* Mode control. */
-#define 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. */
-#define 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. */
-#define PIT_CTRL_PROGR_ONE_SHOT 0x02
-
-/* Rate generator. Output is low for one period of the counter, and
- high for the other. */
-#define PIT_CTRL_RATE_GEN 0x04
-
-/* Square wave generator. Output is low for one half of the period,
- and high for the other half. */
-#define 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. */
-#define PIT_CTRL_SOFTSTROBE 0x08
-
-/* Hardware triggered strobe. Like software triggered strobe, but
- only starts the counter when the gate pin is set to high. */
-#define PIT_CTRL_HARDSTROBE 0x0a
-
-/* Count mode. */
-#define PIT_CTRL_COUNT_MASK 0x01
-#define PIT_CTRL_COUNT_BINARY 0x00 /* 16-bit binary counter. */
-#define PIT_CTRL_COUNT_BCD 0x01 /* 4-decade BCD counter. */
#define T_REST ((grub_uint16_t) 0)
#define T_FINE ((grub_uint16_t) -1)
@@ -112,39 +44,6 @@ struct note
grub_uint16_t duration;
};
-static void
-beep_off (void)
-{
- unsigned char status;
-
- status = grub_inb (SPEAKER);
- grub_outb (status & ~(SPEAKER_TMR2 | SPEAKER_DATA), SPEAKER);
-}
-
-static void
-beep_on (grub_uint16_t pitch)
-{
- unsigned char status;
- unsigned int counter;
-
- if (pitch < 20)
- pitch = 20;
- else if (pitch > 20000)
- pitch = 20000;
-
- counter = PIT_FREQUENCY / pitch;
-
- /* Program timer 2. */
- grub_outb (PIT_CTRL_SELECT_2 | PIT_CTRL_READLOAD_WORD
- | PIT_CTRL_SQUAREWAVE_GEN | PIT_CTRL_COUNT_BINARY, PIT_CTRL);
- grub_outb (counter & 0xff, PIT_COUNTER_2); /* LSB */
- grub_outb ((counter >> 8) & 0xff, PIT_COUNTER_2); /* MSB */
-
- /* Start speaker. */
- status = grub_inb (SPEAKER);
- grub_outb (status | SPEAKER_TMR2 | SPEAKER_DATA, SPEAKER);
-}
-
/* Returns whether playing should continue. */
static int
play (unsigned tempo, struct note *note)
@@ -160,11 +59,11 @@ play (unsigned tempo, struct note *note)
switch (note->pitch)
{
case T_REST:
- beep_off ();
+ grub_speaker_beep_off ();
break;
default:
- beep_on (note->pitch);
+ grub_speaker_beep_on (note->pitch);
break;
}
@@ -263,7 +162,7 @@ grub_cmd_play (grub_command_t cmd __attribute__ ((unused)),
}
}
- beep_off ();
+ grub_speaker_beep_off ();
return 0;
}
diff --git a/grub-core/kern/i386/pit.c b/grub-core/kern/i386/pit.c
index 82a17d3..092481a 100644
--- a/grub-core/kern/i386/pit.c
+++ b/grub-core/kern/i386/pit.c
@@ -20,37 +20,30 @@
#include <grub/i386/io.h>
#include <grub/i386/pit.h>
-#define TIMER2_REG_CONTROL 0x42
-#define TIMER_REG_COMMAND 0x43
-#define TIMER2_REG_LATCH 0x61
-
-#define TIMER2_SELECT 0x80
-#define TIMER_ENABLE_LSB 0x20
-#define TIMER_ENABLE_MSB 0x10
-#define TIMER2_LATCH 0x20
-#define TIMER2_SPEAKER 0x02
-#define TIMER2_GATE 0x01
-
void
grub_pit_wait (grub_uint16_t tics)
{
/* Disable timer2 gate and speaker. */
- grub_outb (grub_inb (TIMER2_REG_LATCH) & ~ (TIMER2_SPEAKER | TIMER2_GATE),
- TIMER2_REG_LATCH);
+ grub_outb (grub_inb (GRUB_PIT_SPEAKER_PORT)
+ & ~ (GRUB_PIT_SPK_DATA | GRUB_PIT_SPK_TMR2),
+ GRUB_PIT_SPEAKER_PORT);
/* Set tics. */
- grub_outb (TIMER2_SELECT | TIMER_ENABLE_LSB | TIMER_ENABLE_MSB, TIMER_REG_COMMAND);
- grub_outb (tics & 0xff, TIMER2_REG_CONTROL);
- grub_outb (tics >> 8, TIMER2_REG_CONTROL);
+ grub_outb (GRUB_PIT_CTRL_SELECT_2 | GRUB_PIT_CTRL_READLOAD_WORD,
+ GRUB_PIT_CTRL);
+ grub_outb (tics & 0xff, GRUB_PIT_COUNTER_2);
+ grub_outb (tics >> 8, GRUB_PIT_COUNTER_2);
/* Enable timer2 gate, keep speaker disabled. */
- grub_outb ((grub_inb (TIMER2_REG_LATCH) & ~ TIMER2_SPEAKER) | TIMER2_GATE,
- TIMER2_REG_LATCH);
+ grub_outb ((grub_inb (GRUB_PIT_SPEAKER_PORT) & ~ GRUB_PIT_SPK_DATA)
+ | GRUB_PIT_SPK_TMR2,
+ GRUB_PIT_SPEAKER_PORT);
/* Wait. */
- while ((grub_inb (TIMER2_REG_LATCH) & TIMER2_LATCH) == 0x00);
+ while ((grub_inb (GRUB_PIT_SPEAKER_PORT) & GRUB_PIT_SPK_TMR2_LATCH) == 0x00);
/* Disable timer2 gate and speaker. */
- grub_outb (grub_inb (TIMER2_REG_LATCH) & ~ (TIMER2_SPEAKER | TIMER2_GATE),
- TIMER2_REG_LATCH);
+ grub_outb (grub_inb (GRUB_PIT_SPEAKER_PORT)
+ & ~ (GRUB_PIT_SPK_DATA | GRUB_PIT_SPK_TMR2),
+ GRUB_PIT_SPEAKER_PORT);
}
diff --git a/grub-core/term/morse.c b/grub-core/term/morse.c
new file mode 100644
index 0000000..3d6c650
--- /dev/null
+++ b/grub-core/term/morse.c
@@ -0,0 +1,131 @@
+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 2011,2012,2013 Free Software Foundation, Inc.
+ *
+ * GRUB is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GRUB is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/term.h>
+#include <grub/misc.h>
+#include <grub/types.h>
+#include <grub/err.h>
+#include <grub/dl.h>
+#include <grub/time.h>
+#include <grub/speaker.h>
+
+GRUB_MOD_LICENSE ("GPLv3+");
+
+#define BASE_TIME 250
+
+static const char codes[0x80][6] =
+ {
+ ['0'] = { 3, 3, 3, 3, 3, 0 },
+ ['1'] = { 1, 3, 3, 3, 3, 0 },
+ ['2'] = { 1, 1, 3, 3, 3, 0 },
+ ['3'] = { 1, 1, 1, 3, 3, 0 },
+ ['4'] = { 1, 1, 1, 1, 3, 0 },
+ ['5'] = { 1, 1, 1, 1, 1, 0 },
+ ['6'] = { 3, 1, 1, 1, 1, 0 },
+ ['7'] = { 3, 3, 1, 1, 1, 0 },
+ ['8'] = { 3, 3, 3, 1, 1, 0 },
+ ['9'] = { 3, 3, 3, 3, 1, 0 },
+ ['a'] = { 1, 3, 0 },
+ ['b'] = { 3, 1, 1, 1, 0 },
+ ['c'] = { 3, 1, 3, 1, 0 },
+ ['d'] = { 3, 1, 1, 0 },
+ ['e'] = { 1, 0 },
+ ['f'] = { 1, 1, 3, 1, 0 },
+ ['g'] = { 3, 3, 1, 0 },
+ ['h'] = { 1, 1, 1, 1, 0 },
+ ['i'] = { 1, 1, 0 },
+ ['j'] = { 1, 3, 3, 3, 0 },
+ ['k'] = { 3, 1, 3, 0 },
+ ['l'] = { 1, 3, 1, 1, 0 },
+ ['m'] = { 3, 3, 0 },
+ ['n'] = { 3, 1, 0 },
+ ['o'] = { 3, 3, 3, 0 },
+ ['p'] = { 1, 3, 3, 1, 0 },
+ ['q'] = { 3, 3, 1, 3, 0 },
+ ['r'] = { 1, 3, 1, 0 },
+ ['s'] = { 1, 1, 1, 0 },
+ ['t'] = { 3, 0 },
+ ['u'] = { 1, 1, 3, 0 },
+ ['v'] = { 1, 1, 1, 3, 0 },
+ ['w'] = { 1, 3, 3, 0 },
+ ['x'] = { 3, 1, 1, 3, 0 },
+ ['y'] = { 3, 1, 3, 3, 0 },
+ ['z'] = { 3, 3, 1, 1, 0 }
+ };
+
+static void
+grub_audio_tone (int length)
+{
+ grub_speaker_beep_on (1000);
+ grub_millisleep (length);
+ grub_speaker_beep_off ();
+}
+
+static void
+grub_audio_putchar (struct grub_term_output *term __attribute__ ((unused)),
+ const struct grub_unicode_glyph *c_in)
+{
+ grub_uint8_t c;
+ int i;
+
+ /* For now, do not try to use a surrogate pair. */
+ if (c_in->base > 0x7f)
+ c = '?';
+ else
+ c = grub_tolower (c_in->base);
+ for (i = 0; codes[c][i]; i++)
+ {
+ grub_audio_tone (codes[c][i] * BASE_TIME);
+ grub_millisleep (BASE_TIME);
+ }
+ grub_millisleep (2 * BASE_TIME);
+}
+
+
+static int
+dummy (void)
+{
+ return 0;
+}
+
+static struct grub_term_output grub_audio_term_output =
+ {
+ .name = "morse",
+ .init = (void *) dummy,
+ .fini = (void *) dummy,
+ .putchar = grub_audio_putchar,
+ .getwh = (void *) dummy,
+ .getxy = (void *) dummy,
+ .gotoxy = (void *) dummy,
+ .cls = (void *) dummy,
+ .setcolorstate = (void *) dummy,
+ .setcursor = (void *) dummy,
+ .normal_color = GRUB_TERM_DEFAULT_NORMAL_COLOR,
+ .highlight_color = GRUB_TERM_DEFAULT_HIGHLIGHT_COLOR,
+ .flags = GRUB_TERM_CODE_TYPE_ASCII | GRUB_TERM_DUMB
+ };
+
+GRUB_MOD_INIT (morse)
+{
+ grub_term_register_output ("audio", &grub_audio_term_output);
+}
+
+GRUB_MOD_FINI (morse)
+{
+ grub_term_unregister_output (&grub_audio_term_output);
+}
diff --git a/grub-core/term/spkmodem.c b/grub-core/term/spkmodem.c
new file mode 100644
index 0000000..31dab65
--- /dev/null
+++ b/grub-core/term/spkmodem.c
@@ -0,0 +1,106 @@
+/* console.c -- Open Firmware console for GRUB. */
+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 2003,2004,2005,2007,2008,2009 Free Software Foundation, Inc.
+ *
+ * GRUB is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GRUB is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/term.h>
+#include <grub/types.h>
+#include <grub/misc.h>
+#include <grub/mm.h>
+#include <grub/time.h>
+#include <grub/terminfo.h>
+#include <grub/dl.h>
+#include <grub/speaker.h>
+
+GRUB_MOD_LICENSE ("GPLv3+");
+
+extern struct grub_terminfo_output_state grub_spkmodem_terminfo_output;
+
+static void
+put (struct grub_term_output *term __attribute__ ((unused)), const int c)
+{
+ int i;
+
+ for (i = 7; i >= 0; i--)
+ {
+ if ((c >> i) & 1)
+ grub_speaker_beep_on (2000);
+ else
+ grub_speaker_beep_on (4000);
+ grub_millisleep (10);
+ grub_speaker_beep_on (1000);
+ grub_millisleep (10);
+ }
+ grub_speaker_beep_on (50);
+}
+
+static grub_err_t
+grub_spkmodem_init_output (struct grub_term_output *term)
+{
+ grub_speaker_beep_on (50);
+ grub_millisleep (50);
+
+ grub_terminfo_output_init (term);
+
+ return 0;
+}
+
+static grub_err_t
+grub_spkmodem_fini_output (struct grub_term_output *term __attribute__ ((unused)))
+{
+ grub_speaker_beep_off ();
+ return 0;
+}
+
+
+
+
+struct grub_terminfo_output_state grub_spkmodem_terminfo_output =
+ {
+ .put = put,
+ .width = 80,
+ .height = 24
+ };
+
+static struct grub_term_output grub_spkmodem_term_output =
+ {
+ .name = "spkmodem",
+ .init = grub_spkmodem_init_output,
+ .fini = grub_spkmodem_fini_output,
+ .putchar = grub_terminfo_putchar,
+ .getxy = grub_terminfo_getxy,
+ .getwh = grub_terminfo_getwh,
+ .gotoxy = grub_terminfo_gotoxy,
+ .cls = grub_terminfo_cls,
+ .setcolorstate = grub_terminfo_setcolorstate,
+ .setcursor = grub_terminfo_setcursor,
+ .flags = GRUB_TERM_CODE_TYPE_ASCII,
+ .data = &grub_spkmodem_terminfo_output,
+ .normal_color = GRUB_TERM_DEFAULT_NORMAL_COLOR,
+ .highlight_color = GRUB_TERM_DEFAULT_HIGHLIGHT_COLOR,
+ };
+
+GRUB_MOD_INIT (spkmodem)
+{
+ grub_term_register_output ("spkmodem", &grub_spkmodem_term_output);
+}
+
+
+GRUB_MOD_FINI (spkmodem)
+{
+ grub_term_unregister_output (&grub_spkmodem_term_output);
+}
diff --git a/include/grub/i386/pit.h b/include/grub/i386/pit.h
index ff9b9a6..e1c92cd 100644
--- a/include/grub/i386/pit.h
+++ b/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 */
diff --git a/include/grub/speaker.h b/include/grub/speaker.h
new file mode 100644
index 0000000..a076fcf
--- /dev/null
+++ b/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
diff --git a/util/spkmodem-recv.c b/util/spkmodem-recv.c
new file mode 100644
index 0000000..cbec3af
--- /dev/null
+++ b/util/spkmodem-recv.c
@@ -0,0 +1,98 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+/* Compilation: gcc -o spkmodem-recv spkmodem-recv */
+/* Usage: parecord --channels=1 --rate=48000 --format=s16le | ./spkmodem-recv */
+
+#define RATE 48000
+#define SAMPLES_PER_TRAME 480
+#define AMPLITUDE_THRESHOLD 100000
+#define FREQ_SEP_MIN 15
+#define FREQ_SEP_NOM 20
+#define FREQ_SEP_MAX 25
+
+#define FREQ_DATA_MIN 10
+#define FREQ_DATA_THRESHOLD 60
+#define FREQ_DATA_MAX 120
+#define AMPLITUDE_SAMPLES 2 * SAMPLES_PER_TRAME
+
+#define THRESHOLD 1000
+
+#define DEBUG 0
+
+static signed short trame[2 * SAMPLES_PER_TRAME];
+static signed short pulse[2 * SAMPLES_PER_TRAME];
+static int ringpos = 0;
+static int pos, f1, f2;
+static int amplitude = 0;
+static int lp = 0;
+
+static void
+read_sample (void)
+{
+ amplitude -= abs (trame[ringpos]);
+ f1 -= pulse[ringpos];
+ f1 += pulse[(ringpos + SAMPLES_PER_TRAME) % (2 * SAMPLES_PER_TRAME)];
+ f2 -= pulse[(ringpos + SAMPLES_PER_TRAME) % (2 * SAMPLES_PER_TRAME)];
+ fread (trame + ringpos, 1, sizeof (trame[0]), stdin);
+ amplitude += abs (trame[ringpos]);
+
+ if (pos ? (trame[ringpos] < -THRESHOLD)
+ : (trame[ringpos] > +THRESHOLD))
+ {
+ pulse[ringpos] = 1;
+ pos = !pos;
+ f2++;
+ }
+ else
+ pulse[ringpos] = 0;
+ ringpos++;
+ ringpos %= 2 * SAMPLES_PER_TRAME;
+ lp++;
+}
+
+int
+main ()
+{
+ int bitn = 7;
+ char c = 0;
+ int i;
+ while (!feof (stdin))
+ {
+ if (lp > 20000)
+ {
+ fflush (stdout);
+ bitn = 7;
+ c = 0;
+ lp = 0;
+ }
+ if (f2 > 12 && f2 < 25
+ && f1 > 5 && f1 < 120)
+ {
+#if DEBUG
+ printf ("%d %d %d @%d\n", f1, f2, FREQ_DATA_THRESHOLD,
+ ftell (stdin) - sizeof (trame));
+#endif
+ if (f1 < 60)
+ c |= (1 << bitn);
+ bitn--;
+ if (bitn < 0)
+ {
+#if DEBUG
+ printf ("<%c, %x>", c, c);
+#else
+ printf ("%c", c);
+#endif
+ bitn = 7;
+ c = 0;
+ }
+ lp = 0;
+ for (i = 0; i < SAMPLES_PER_TRAME; i++)
+ read_sample ();
+ continue;
+ }
+ read_sample ();
+ }
+ return 0;
+}
--
1.8.2.1
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