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