src/include/pc80/vga.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2
   3 #ifndef VGA_H
   4 #define VGA_H
   5
   6 #define VGA_FB 0xB8000
   7 #define VGA_FB_SIZE 0x4000 /* char + attr = word sized so 0x8000 / 2 */
   8 #define VGA_COLUMNS 80
   9 #define VGA_LINES 25
  10
  11 #define VGA_TEXT_HORIZONTAL_TOP 0
  12 #define VGA_TEXT_HORIZONTAL_MIDDLE (VGA_LINES / 2)
  13
  14 enum VGA_TEXT_ALIGNMENT {
  15         VGA_TEXT_LEFT,
  16         VGA_TEXT_CENTER,
  17         VGA_TEXT_RIGHT,
  18 };
  19
  20 void vga_io_init(void);
  21
  22 void vga_textmode_init(void);
  23
  24 void vga_cursor_enable(int enable);
  25 void vga_cursor_reset(void);
  26 void vga_cursor_set(unsigned int line, unsigned int character);
  27
  28 void vga_frame_set(unsigned int line, unsigned int character);
  29
  30 void vga_line_write(unsigned int line, const char *string);
  31
  32 /*
  33  * vga_write_text() writes a line of text aligned left/center/right
  34  * horizontally on the screen (i.e. enum VGA_TEXT_ALIGNMENT)
  35  */
  36 void vga_write_text(enum VGA_TEXT_ALIGNMENT alignment, unsigned int line,
  37                     const unsigned char *ustring);
  38
  39 #endif /* VGA_H */