include/grub/i386/pc/serial.h

   1 /* serial.h - serial device interface */
   2 /*
   3  *  GRUB  --  GRand Unified Bootloader
   4  *  Copyright (C) 2000,2001,2002,2005  Free Software Foundation, Inc.
   5  *
   6  *  This program 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 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program 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.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21 #ifndef GRUB_SERIAL_MACHINE_HEADER
  22 #define GRUB_SERIAL_MACHINE_HEADER      1
  23
  24 /* Macros.  */
  25
  26 /* The offsets of UART registers.  */
  27 #define UART_TX         0
  28 #define UART_RX         0
  29 #define UART_DLL        0
  30 #define UART_IER        1
  31 #define UART_DLH        1
  32 #define UART_IIR        2
  33 #define UART_FCR        2
  34 #define UART_LCR        3
  35 #define UART_MCR        4
  36 #define UART_LSR        5
  37 #define UART_MSR        6
  38 #define UART_SR         7
  39
  40 /* For LSR bits.  */
  41 #define UART_DATA_READY         0x01
  42 #define UART_EMPTY_TRANSMITTER  0x20
  43
  44 /* The type of parity.  */
  45 #define UART_NO_PARITY          0x00
  46 #define UART_ODD_PARITY         0x08
  47 #define UART_EVEN_PARITY        0x18
  48
  49 /* The type of word length.  */
  50 #define UART_5BITS_WORD 0x00
  51 #define UART_6BITS_WORD 0x01
  52 #define UART_7BITS_WORD 0x02
  53 #define UART_8BITS_WORD 0x03
  54
  55 /* The type of the length of stop bit.  */
  56 #define UART_1_STOP_BIT         0x00
  57 #define UART_2_STOP_BITS        0x04
  58
  59 /* the switch of DLAB.  */
  60 #define UART_DLAB       0x80
  61
  62 /* Enable the FIFO.  */
  63 #define UART_ENABLE_FIFO        0xC7
  64
  65 /* Turn on DTR, RTS, and OUT2.  */
  66 #define UART_ENABLE_MODEM       0x0B
  67
  68 #endif /* ! GRUB_SERIAL_MACHINE_HEADER */