1
/* serial.h - serial device interface */
3
* GRUB -- GRand Unified Bootloader
4
* Copyright (C) 2000,2001,2002,2005,2007 Free Software Foundation, Inc.
6
* GRUB is free software: you can redistribute it and/or modify
7
* it under the terms of the GNU General Public License as published by
8
* the Free Software Foundation, either version 3 of the License, or
9
* (at your option) any later version.
11
* GRUB is distributed in the hope that it will be useful,
12
* but WITHOUT ANY WARRANTY; without even the implied warranty of
13
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14
* GNU General Public License for more details.
16
* You should have received a copy of the GNU General Public License
17
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
20
#ifndef GRUB_SERIAL_HEADER
21
#define GRUB_SERIAL_HEADER 1
25
/* The offsets of UART registers. */
40
#define UART_DATA_READY 0x01
41
#define UART_EMPTY_TRANSMITTER 0x20
43
/* The type of parity. */
44
#define UART_NO_PARITY 0x00
45
#define UART_ODD_PARITY 0x08
46
#define UART_EVEN_PARITY 0x18
48
/* The type of word length. */
49
#define UART_5BITS_WORD 0x00
50
#define UART_6BITS_WORD 0x01
51
#define UART_7BITS_WORD 0x02
52
#define UART_8BITS_WORD 0x03
54
/* The type of the length of stop bit. */
55
#define UART_1_STOP_BIT 0x00
56
#define UART_2_STOP_BITS 0x04
58
/* the switch of DLAB. */
59
#define UART_DLAB 0x80
61
/* Enable the FIFO. */
62
#define UART_ENABLE_FIFO 0xC7
64
/* Turn on DTR, RTS, and OUT2. */
65
#define UART_ENABLE_MODEM 0x0B
67
#endif /* ! GRUB_SERIAL_MACHINE_HEADER */