105 lines
3.6 KiB
C
105 lines
3.6 KiB
C
/*
|
|
* 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. */
|
|
};
|
|
|
|
void EXPORT_FUNC(grub_pit_wait) (grub_uint16_t tics);
|
|
|
|
#endif /* ! KERNEL_CPU_PIT_HEADER */
|