1 /* 2 * Copyright 2010 Google Inc. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 /* don't allocate ebda if new value at 0x40e will be less than this */ 18 #define EBDA_MIN_SEG 0x9800 19 #define SGABIOS_EBDA_KB 1 20 /* note: no testing has yet been done logging other than 256 bytes */ 21 #define SGABIOS_EBDA_BYTES (SGABIOS_EBDA_KB*1024) 22 #define SGABIOS_EBDA_DELTA (SGABIOS_EBDA_BYTES/16) 23 #define SGABIOS_EBDA_LOG_START 256 24 #define SGABIOS_EBDA_LOG_SIZE 256 25 #define SGABIOS_EBDA_POS_START (SGABIOS_EBDA_LOG_START+SGABIOS_EBDA_LOG_SIZE) 26 #define SGABIOS_EBDA_POS_LAST (SGABIOS_EBDA_POS_START+(SGABIOS_EBDA_LOG_SIZE*2)-2) 27 28 /* serial costants that may require modification */ 29 #define COM_BASE_ADDR 0x3f8 30 #define PORT_SPEED 115200 31 #define LCR_VALUE 0x13 /* 8n1 */ 32 33 /* serial constants below shouldn't require modification */ 34 #define IER_OFFSET 0x01 35 #define FCR_OFFSET 0x02 36 #define LCR_OFFSET 0x03 37 #define MCR_OFFSET 0x04 38 #define LSR_OFFSET 0x05 39 #define MSR_OFFSET 0x06 40 #define SCR_OFFSET 0x07 41 #define LCR_DLAB 0x80 42 #define MCR_DTRRTS 0x03 43 #define FCR_FIFO_ENABLE 0x01 44 #define PORT_DIVISOR 115200 45 #define TRANSMIT_READY_BIT 0x20 46 #define BIOS_BUILD_VERSION "$Id: sgabios.S 7 2009-11-13 00:21:26Z smiles@google.com $" 47 48 #define KBD_HEAD 0x1a 49 #define KBD_TAIL 0x1c 50 #define KBD_BUF_START 0x1e 51 #define KBD_BUF_END 0x3e 52 53 #define VGA_IO_BASE 0x3d4 54 #define BDA_SEG 0x40 55 #define BDA_EBDA 0x0e 56 #define BDA_MEM_SIZE 0x13 57 #define BDA_MODE_NUM 0x49 58 #define BDA_COLS 0x4a 59 #define BDA_PAGE_SIZE 0x4c 60 /* BDA word 40:0c traditionally holds the LPT3 io port address... */ 61 /* Reuse it for tracking where the serial console cursor was left */ 62 /* Don't send ansi cursor pos update without text ready to output */ 63 /* Some operations don't update cursor position, but next int 10h */ 64 /* call is often one that might update to where cursor already is */ 65 #define BDA_SERIAL_POS 0x0c 66 #define BDA_CURSOR_BUF 0x50 67 #define BDA_CURSOR_COL 0x50 68 #define BDA_CURSOR_ROW 0x51 69 #define BDA_CURSOR_SCAN 0x60 70 #define BDA_ACTIVE_PAGE 0x62 71 #define BDA_6845_ADDR 0x63 72 #define BDA_MODE_SEL 0x65 73 #define BDA_COLOR_VAL 0x66 74 #define BDA_ROM_OFF 0x67 75 #define BDA_ROM_SEG 0x69 76 #define BDA_ROWS 0x84 77