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/*
* Copyright 2010 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* don't allocate ebda if new value at 0x40e will be less than this */
#define EBDA_MIN_SEG 0x9800
#define SGABIOS_EBDA_KB 1
/* note: no testing has yet been done logging other than 256 bytes */
#define SGABIOS_EBDA_BYTES (SGABIOS_EBDA_KB*1024)
#define SGABIOS_EBDA_DELTA (SGABIOS_EBDA_BYTES/16)
#define SGABIOS_EBDA_LOG_START 256
#define SGABIOS_EBDA_LOG_SIZE 256
#define SGABIOS_EBDA_POS_START (SGABIOS_EBDA_LOG_START+SGABIOS_EBDA_LOG_SIZE)
#define SGABIOS_EBDA_POS_LAST (SGABIOS_EBDA_POS_START+(SGABIOS_EBDA_LOG_SIZE*2)-2)
/* serial costants that may require modification */
#define COM_BASE_ADDR 0x3f8
#define PORT_SPEED 115200
#define LCR_VALUE 0x13 /* 8n1 */
/* serial constants below shouldn't require modification */
#define IER_OFFSET 0x01
#define FCR_OFFSET 0x02
#define LCR_OFFSET 0x03
#define MCR_OFFSET 0x04
#define LSR_OFFSET 0x05
#define MSR_OFFSET 0x06
#define SCR_OFFSET 0x07
#define LCR_DLAB 0x80
#define MCR_DTRRTS 0x03
#define FCR_FIFO_ENABLE 0x01
#define PORT_DIVISOR 115200
#define TRANSMIT_READY_BIT 0x20
#define BIOS_BUILD_VERSION "$Id: sgabios.S 7 2009-11-13 00:21:26Z smiles@google.com $"
#define KBD_HEAD 0x1a
#define KBD_TAIL 0x1c
#define KBD_BUF_START 0x1e
#define KBD_BUF_END 0x3e
#define VGA_IO_BASE 0x3d4
#define BDA_SEG 0x40
#define BDA_EBDA 0x0e
#define BDA_MEM_SIZE 0x13
#define BDA_MODE_NUM 0x49
#define BDA_COLS 0x4a
#define BDA_PAGE_SIZE 0x4c
/* BDA word 40:0c traditionally holds the LPT3 io port address... */
/* Reuse it for tracking where the serial console cursor was left */
/* Don't send ansi cursor pos update without text ready to output */
/* Some operations don't update cursor position, but next int 10h */
/* call is often one that might update to where cursor already is */
#define BDA_SERIAL_POS 0x0c
#define BDA_CURSOR_BUF 0x50
#define BDA_CURSOR_COL 0x50
#define BDA_CURSOR_ROW 0x51
#define BDA_CURSOR_SCAN 0x60
#define BDA_ACTIVE_PAGE 0x62
#define BDA_6845_ADDR 0x63
#define BDA_MODE_SEL 0x65
#define BDA_COLOR_VAL 0x66
#define BDA_ROM_OFF 0x67
#define BDA_ROM_SEG 0x69
#define BDA_ROWS 0x84
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