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/* vga.h - Interface for VGA hardware access.
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_H_
#define _VGA_H_ 1
#include <errno.h>
#include <sys/types.h>
/* The VGA interface does not do locking on its own, for maximum
efficiency it relies on locking by the caller (because usually the
caller has some other data structures to lock along with the
VGA hardware. */
/* The mapped video memory. */
extern char *vga_videomem;
/* Initialize the VGA hardware and set up the permissions and memory
mappings. */
error_t vga_init (void);
/* Release the resources and privileges associated with the VGA
hardware access. */
void vga_deinit (void);
/* Write DATALEN bytes from DATA to the font buffer BUFFER, starting
from glyph index. */
void vga_write_font_buffer (int buffer, int index, char *data, size_t datalen);
/* Read DATALEN bytes into DATA from the font buffer BUFFER, starting
from glyph INDEX. */
void vga_read_font_buffer (int buffer, int index, char *data, size_t datalen);
/* Set FONT_BUFFER_SUPP to FONT_BUFFER if the font is small. */
void vga_select_font_buffer (int font_buffer, int font_buffer_supp);
/* Enable (if ON is true) or disable (otherwise) the cursor. Expects
the VGA hardware to be locked. */
void vga_display_cursor (int on);
/* Set the cursor position to POS, which is (x_pos + y_pos * width). */
void vga_set_cursor (int pos);
#endif /* _VGA_H_ */
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