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Diffstat (limited to 'console/vga-hw.h')
| -rw-r--r-- | console/vga-hw.h | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/console/vga-hw.h b/console/vga-hw.h new file mode 100644 index 00000000..dc147e00 --- /dev/null +++ b/console/vga-hw.h @@ -0,0 +1,111 @@ +/* vga-hw.h - Definitions for the VGA hardware. + Copyright (C) 2002 Free Software Foundation, Inc. + Written by Marcus Brinkmann. + + This file is part of the GNU Hurd. + + The GNU Hurd is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License as + published by the Free Software Foundation; either version 2, or (at + your option) any later version. + + The GNU Hurd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. */ + +#ifndef _VGA_HW_H_ +#define _VGA_HW_H_ 1 + +#define VGA_VIDEO_MEM_BASE_ADDR 0x0a0000 +#define VGA_VIDEO_MEM_LENGTH 0x004000 + +#define VGA_FONT_BUFFER 8 +#define VGA_FONT_SIZE 256 +#define VGA_FONT_HEIGHT 32 + +#define VGA_MIN_REG 0x3c0 +#define VGA_MAX_REG 0x3df + +/* The sequencer address register selects the sub-register of the + sequencer that is accessed through the sequencer data register. */ +#define VGA_SEQ_ADDR_REG 0x3c4 +#define VGA_SEQ_DATA_REG 0x3c5 + +/* The reset subregister can be used to asynchronously or + synchronously halt or clear the sequencer. */ +#define VGA_SEQ_RESET_ADDR 0x00 +#define VGA_SEQ_RESET_ASYNC 0x10 /* Can cause loss of video data. */ +#define VGA_SEQ_RESET_SYNC 0x01 +#define VGA_SEQ_RESET_CLEAR 0x11 /* Sequencer can operate. */ + +/* The map subregister specifies which planes are written to. */ +#define VGA_SEQ_MAP_ADDR 0x02 +#define VGA_SEQ_MAP_PLANE0 0x01 +#define VGA_SEQ_MAP_PLANE1 0x02 +#define VGA_SEQ_MAP_PLANE2 0x04 +#define VGA_SEQ_MAP_PLANE3 0x08 + +/* The font subregister. */ +#define VGA_SEQ_FONT_ADDR 0x03 + +/* The memory mode subregister specifies the way that memory is + accessed. */ +#define VGA_SEQ_MODE_ADDR 0x04 +#define VGA_SEQ_MODE_EXT 0x02 /* Access 265kB rather than 64kB. */ +#define VGA_SEQ_MODE_SEQUENTIAL 0x04 /* Sequential, not odd/even addr. */ +#define VGA_SEQ_MODE_CHAIN4 0x08 /* Chain 4 addressing. */ + + +/* The graphics address register selects the sub-register that is + accessed through the graphics data register. */ +#define VGA_GFX_ADDR_REG 0x3ce +#define VGA_GFX_DATA_REG 0x3cf + +/* The map subregister selects the plane to read from. */ +#define VGA_GFX_MAP_ADDR 0x04 +#define VGA_GFX_MAP_PLANE0 0x00 +#define VGA_GFX_MAP_PLANE1 0x01 +#define VGA_GFX_MAP_PLANE2 0x02 +#define VGA_GFX_MAP_PLANE3 0x03 + +/* The mode subregister selects the memory access mode. */ +#define VGA_GFX_MODE_ADDR 0x05 +#define VGA_GFX_MODE_SHIFT256 0x40 +#define VGA_GFX_MODE_SHIFT 0x20 +#define VGA_GFX_MODE_HOSTOE 0x10 +#define VGA_GFX_MODE_READ0 0x00 +#define VGA_GFX_MODE_READ1 0x08 +#define VGA_GFX_MODE_WRITE0 0x00 +#define VGA_GFX_MODE_WRITE1 0x01 +#define VGA_GFX_MODE_WRITE2 0x02 +#define VGA_GFX_MODE_WRITE3 0x03 + +/* The miscellaneous subregister. */ +#define VGA_GFX_MISC_ADDR 0x06 +#define VGA_GFX_MISC_GFX 0x01 /* Switch on graphics mode. */ +#define VGA_GFX_MISC_CHAINOE 0x02 +#define VGA_GFX_MISC_A0TOBF 0x00 +#define VGA_GFX_MISC_A0TOAF 0x04 +#define VGA_GFX_MISC_B0TOB7 0x08 +#define VGA_GFX_MISC_B8TOBF 0x0c + + +/* The CRTC Registers. XXX Depends on the I/O Address Select field. + However, the only need to use the other values is for compatibility + with monochrome adapters. */ +#define VGA_CRT_ADDR_REG 0x3d4 +#define VGA_CRT_DATA_REG 0x3d5 + +/* The cursor start subregister. */ +#define VGA_CRT_CURSOR_START 0x0a +#define VGA_CRT_CURSOR_DISABLE 0x10 + +#define VGA_CRT_CURSOR_HIGH 0x0e +#define VGA_CRT_CURSOR_LOW 0x0f + +#endif |