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Diffstat (limited to 'src/roms/sgabios/sgabios.h')
| -rw-r--r-- | src/roms/sgabios/sgabios.h | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/src/roms/sgabios/sgabios.h b/src/roms/sgabios/sgabios.h new file mode 100644 index 0000000..51e829c --- /dev/null +++ b/src/roms/sgabios/sgabios.h @@ -0,0 +1,76 @@ +/* + * 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 |
