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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 16:29:51 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 16:29:51 +0000
commit6e7a315eb67cb6c113cf37e1d66c4f11a51a2b3e (patch)
tree32451fa3cdd9321fb2591fada9891b2cb70a9cd1 /include/grub/i386/pit.h
parentInitial commit. (diff)
downloadgrub2-6e7a315eb67cb6c113cf37e1d66c4f11a51a2b3e.tar.xz
grub2-6e7a315eb67cb6c113cf37e1d66c4f11a51a2b3e.zip
Adding upstream version 2.06.upstream/2.06upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'include/grub/i386/pit.h')
-rw-r--r--include/grub/i386/pit.h103
1 files changed, 103 insertions, 0 deletions
diff --git a/include/grub/i386/pit.h b/include/grub/i386/pit.h
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+++ b/include/grub/i386/pit.h
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+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 2008 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/>.
+ */
+
+#ifndef KERNEL_CPU_PIT_HEADER
+#define KERNEL_CPU_PIT_HEADER 1
+
+#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. */
+ };
+
+#endif /* ! KERNEL_CPU_PIT_HEADER */