drivers/video/console/fbcon.h - maze/linux - Git at Google

 /*
  *  linux/drivers/video/console/fbcon.h -- Low level frame buffer based console driver
  *
  *	Copyright (C) 1997 Geert Uytterhoeven
  *
  *  This file is subject to the terms and conditions of the GNU General Public
  *  License.  See the file COPYING in the main directory of this archive
  *  for more details.
  */

 #ifndef _VIDEO_FBCON_H
 #define _VIDEO_FBCON_H

 #include <linux/config.h>
 #include <linux/types.h>
 #include <linux/vt_buffer.h>
 #include <linux/vt_kern.h>

 #include <asm/io.h>

 #define FBCON_FLAGS_INIT         1
 #define FBCON_FLAGS_CURSOR_TIMER 2

    /*
     *    This is the interface between the low-level console driver and the
     *    low-level frame buffer device
     */

 struct display {
     /* Filled in by the low-level console driver */
     const u_char *fontdata;
     int userfont;                   /* != 0 if fontdata kmalloc()ed */
     u_short scrollmode;             /* Scroll Method */
     u_short inverse;                /* != 0 text black on white as default */
     short yscroll;                  /* Hardware scrolling */
     int vrows;                      /* number of virtual rows */
     int cursor_shape;
     int con_rotate;
     u32 xres_virtual;
     u32 yres_virtual;
     u32 height;
     u32 width;
     u32 bits_per_pixel;
     u32 grayscale;
     u32 nonstd;
     u32 accel_flags;
     u32 rotate;
     struct fb_bitfield red;
     struct fb_bitfield green;
     struct fb_bitfield blue;
     struct fb_bitfield transp;
     struct fb_videomode *mode;
 };

 struct fbcon_ops {
 	void (*bmove)(struct vc_data *vc, struct fb_info *info, int sy,
 		      int sx, int dy, int dx, int height, int width);
 	void (*clear)(struct vc_data *vc, struct fb_info *info, int sy,
 		      int sx, int height, int width);
 	void (*putcs)(struct vc_data *vc, struct fb_info *info,
 		      const unsigned short *s, int count, int yy, int xx,
 		      int fg, int bg);
 	void (*clear_margins)(struct vc_data *vc, struct fb_info *info,
 			      int bottom_only);
 	void (*cursor)(struct vc_data *vc, struct fb_info *info, int mode,
 		       int softback_lines, int fg, int bg);
 	int  (*update_start)(struct fb_info *info);
 	int  (*rotate_font)(struct fb_info *info, struct vc_data *vc);
 	struct fb_var_screeninfo var;  /* copy of the current fb_var_screeninfo */
 	struct timer_list cursor_timer; /* Cursor timer */
 	struct fb_cursor cursor_state;
 	struct display *p;
         int    currcon;	                /* Current VC. */
 	int    cursor_flash;
 	int    cursor_reset;
 	int    blank_state;
 	int    graphics;
 	int    flags;
 	int    rotate;
 	int    cur_rotate;
 	char  *cursor_data;
 	u8    *fontbuffer;
 	u8    *fontdata;
 	u32    fd_size;
 };
     /*
      *  Attribute Decoding
      */

 /* Color */
 #define attr_fgcol(fgshift,s)    \
 	(((s) >> (fgshift)) & 0x0f)
 #define attr_bgcol(bgshift,s)    \
 	(((s) >> (bgshift)) & 0x0f)
 #define	attr_bgcol_ec(bgshift,vc) \
 	((vc) ? (((vc)->vc_video_erase_char >> (bgshift)) & 0x0f) : 0)
 #define attr_fgcol_ec(fgshift,vc) \
 	((vc) ? (((vc)->vc_video_erase_char >> (fgshift)) & 0x0f) : 0)

 /* Monochrome */
 #define attr_bold(s) \
 	((s) & 0x200)
 #define attr_reverse(s) \
 	((s) & 0x800)
 #define attr_underline(s) \
 	((s) & 0x400)
 #define attr_blink(s) \
 	((s) & 0x8000)

 /* Font */
 #define REFCOUNT(fd)	(((int *)(fd))[-1])
 #define FNTSIZE(fd)	(((int *)(fd))[-2])
 #define FNTCHARCNT(fd)	(((int *)(fd))[-3])
 #define FNTSUM(fd)	(((int *)(fd))[-4])
 #define FONT_EXTRA_WORDS 4

     /*
      *  Scroll Method
      */

 /* There are several methods fbcon can use to move text around the screen:
  *
  *                     Operation   Pan    Wrap
  *---------------------------------------------
  * SCROLL_MOVE         copyarea    No     No
  * SCROLL_PAN_MOVE     copyarea    Yes    No
  * SCROLL_WRAP_MOVE    copyarea    No     Yes
  * SCROLL_REDRAW       imageblit   No     No
  * SCROLL_PAN_REDRAW   imageblit   Yes    No
  * SCROLL_WRAP_REDRAW  imageblit   No     Yes
  *
  * (SCROLL_WRAP_REDRAW is not implemented yet)
  *
  * In general, fbcon will choose the best scrolling
  * method based on the rule below:
  *
  * Pan/Wrap > accel imageblit > accel copyarea >
  * soft imageblit > (soft copyarea)
  *
  * Exception to the rule: Pan + accel copyarea is
  * preferred over Pan + accel imageblit.
  *
  * The above is typical for PCI/AGP cards. Unless
  * overridden, fbcon will never use soft copyarea.
  *
  * If you need to override the above rule, set the
  * appropriate flags in fb_info->flags.  For example,
  * to prefer copyarea over imageblit, set
  * FBINFO_READS_FAST.
  *
  * Other notes:
  * + use the hardware engine to move the text
  *    (hw-accelerated copyarea() and fillrect())
  * + use hardware-supported panning on a large virtual screen
  * + amifb can not only pan, but also wrap the display by N lines
  *    (i.e. visible line i = physical line (i+N) % yres).
  * + read what's already rendered on the screen and
  *     write it in a different place (this is cfb_copyarea())
  * + re-render the text to the screen
  *
  * Whether to use wrapping or panning can only be figured out at
  * runtime (when we know whether our font height is a multiple
  * of the pan/wrap step)
  *
  */

 #define SCROLL_MOVE	   0x001
 #define SCROLL_PAN_MOVE	   0x002
 #define SCROLL_WRAP_MOVE   0x003
 #define SCROLL_REDRAW	   0x004
 #define SCROLL_PAN_REDRAW  0x005

 #ifdef CONFIG_FB_TILEBLITTING
 extern void fbcon_set_tileops(struct vc_data *vc, struct fb_info *info);
 #endif
 extern void fbcon_set_bitops(struct fbcon_ops *ops);
 extern int  soft_cursor(struct fb_info *info, struct fb_cursor *cursor);

 #define FBCON_ATTRIBUTE_UNDERLINE 1
 #define FBCON_ATTRIBUTE_REVERSE   2
 #define FBCON_ATTRIBUTE_BOLD      4

 static inline int real_y(struct display *p, int ypos)
 {
 	int rows = p->vrows;

 	ypos += p->yscroll;
 	return ypos < rows ? ypos : ypos - rows;
 }


 static inline int get_attribute(struct fb_info *info, u16 c)
 {
 	int attribute = 0;

 	if (fb_get_color_depth(&info->var, &info->fix) == 1) {
 		if (attr_underline(c))
 			attribute |= FBCON_ATTRIBUTE_UNDERLINE;
 		if (attr_reverse(c))
 			attribute |= FBCON_ATTRIBUTE_REVERSE;
 		if (attr_bold(c))
 			attribute |= FBCON_ATTRIBUTE_BOLD;
 	}

 	return attribute;
 }

 #define FBCON_SWAP(i,r,v) ({ \
         typeof(r) _r = (r);  \
         typeof(v) _v = (v);  \
         (void) (&_r == &_v); \
         (i == FB_ROTATE_UR || i == FB_ROTATE_UD) ? _r : _v; })

 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_ROTATION
 extern void fbcon_set_rotate(struct fbcon_ops *ops);
 #else
 #define fbcon_set_rotate(x) do {} while(0)
 #endif /* CONFIG_FRAMEBUFFER_CONSOLE_ROTATION */

 #endif /* _VIDEO_FBCON_H */
	/*
	* linux/drivers/video/console/fbcon.h -- Low level frame buffer based console driver
	*
	* Copyright (C) 1997 Geert Uytterhoeven
	*
	* This file is subject to the terms and conditions of the GNU General Public
	* License. See the file COPYING in the main directory of this archive
	* for more details.
	*/

	#ifndef _VIDEO_FBCON_H
	#define _VIDEO_FBCON_H

	#include <linux/config.h>
	#include <linux/types.h>
	#include <linux/vt_buffer.h>
	#include <linux/vt_kern.h>

	#include <asm/io.h>

	#define FBCON_FLAGS_INIT 1
	#define FBCON_FLAGS_CURSOR_TIMER 2

	/*
	* This is the interface between the low-level console driver and the
	* low-level frame buffer device
	*/

	struct display {
	/* Filled in by the low-level console driver */
	const u_char *fontdata;
	int userfont; /* != 0 if fontdata kmalloc()ed */
	u_short scrollmode; /* Scroll Method */
	u_short inverse; /* != 0 text black on white as default */
	short yscroll; /* Hardware scrolling */
	int vrows; /* number of virtual rows */
	int cursor_shape;
	int con_rotate;
	u32 xres_virtual;
	u32 yres_virtual;
	u32 height;
	u32 width;
	u32 bits_per_pixel;
	u32 grayscale;
	u32 nonstd;
	u32 accel_flags;
	u32 rotate;
	struct fb_bitfield red;
	struct fb_bitfield green;
	struct fb_bitfield blue;
	struct fb_bitfield transp;
	struct fb_videomode *mode;
	};

	struct fbcon_ops {
	void (bmove)(struct vc_data vc, struct fb_info *info, int sy,
	int sx, int dy, int dx, int height, int width);
	void (clear)(struct vc_data vc, struct fb_info *info, int sy,
	int sx, int height, int width);
	void (putcs)(struct vc_data vc, struct fb_info *info,
	const unsigned short *s, int count, int yy, int xx,
	int fg, int bg);
	void (clear_margins)(struct vc_data vc, struct fb_info *info,
	int bottom_only);
	void (cursor)(struct vc_data vc, struct fb_info *info, int mode,
	int softback_lines, int fg, int bg);
	int (update_start)(struct fb_info info);
	int (rotate_font)(struct fb_info info, struct vc_data *vc);
	struct fb_var_screeninfo var; /* copy of the current fb_var_screeninfo */
	struct timer_list cursor_timer; /* Cursor timer */
	struct fb_cursor cursor_state;
	struct display *p;
	int currcon; /* Current VC. */
	int cursor_flash;
	int cursor_reset;
	int blank_state;
	int graphics;
	int flags;
	int rotate;
	int cur_rotate;
	char *cursor_data;
	u8 *fontbuffer;
	u8 *fontdata;
	u32 fd_size;
	};
	/*
	* Attribute Decoding
	*/

	/* Color */
	#define attr_fgcol(fgshift,s) \
	(((s) >> (fgshift)) & 0x0f)
	#define attr_bgcol(bgshift,s) \
	(((s) >> (bgshift)) & 0x0f)
	#define attr_bgcol_ec(bgshift,vc) \
	((vc) ? (((vc)->vc_video_erase_char >> (bgshift)) & 0x0f) : 0)
	#define attr_fgcol_ec(fgshift,vc) \
	((vc) ? (((vc)->vc_video_erase_char >> (fgshift)) & 0x0f) : 0)

	/* Monochrome */
	#define attr_bold(s) \
	((s) & 0x200)
	#define attr_reverse(s) \
	((s) & 0x800)
	#define attr_underline(s) \
	((s) & 0x400)
	#define attr_blink(s) \
	((s) & 0x8000)

	/* Font */
	#define REFCOUNT(fd) (((int *)(fd))[-1])
	#define FNTSIZE(fd) (((int *)(fd))[-2])
	#define FNTCHARCNT(fd) (((int *)(fd))[-3])
	#define FNTSUM(fd) (((int *)(fd))[-4])
	#define FONT_EXTRA_WORDS 4

	/*
	* Scroll Method
	*/

	/* There are several methods fbcon can use to move text around the screen:
	*
	* Operation Pan Wrap
	*---------------------------------------------
	* SCROLL_MOVE copyarea No No
	* SCROLL_PAN_MOVE copyarea Yes No
	* SCROLL_WRAP_MOVE copyarea No Yes
	* SCROLL_REDRAW imageblit No No
	* SCROLL_PAN_REDRAW imageblit Yes No
	* SCROLL_WRAP_REDRAW imageblit No Yes
	*
	* (SCROLL_WRAP_REDRAW is not implemented yet)
	*
	* In general, fbcon will choose the best scrolling
	* method based on the rule below:
	*
	* Pan/Wrap > accel imageblit > accel copyarea >
	* soft imageblit > (soft copyarea)
	*
	* Exception to the rule: Pan + accel copyarea is
	* preferred over Pan + accel imageblit.
	*
	* The above is typical for PCI/AGP cards. Unless
	* overridden, fbcon will never use soft copyarea.
	*
	* If you need to override the above rule, set the
	* appropriate flags in fb_info->flags. For example,
	* to prefer copyarea over imageblit, set
	* FBINFO_READS_FAST.
	*
	* Other notes:
	* + use the hardware engine to move the text
	* (hw-accelerated copyarea() and fillrect())
	* + use hardware-supported panning on a large virtual screen
	* + amifb can not only pan, but also wrap the display by N lines
	* (i.e. visible line i = physical line (i+N) % yres).
	* + read what's already rendered on the screen and
	* write it in a different place (this is cfb_copyarea())
	* + re-render the text to the screen
	*
	* Whether to use wrapping or panning can only be figured out at
	* runtime (when we know whether our font height is a multiple
	* of the pan/wrap step)
	*
	*/

	#define SCROLL_MOVE 0x001
	#define SCROLL_PAN_MOVE 0x002
	#define SCROLL_WRAP_MOVE 0x003
	#define SCROLL_REDRAW 0x004
	#define SCROLL_PAN_REDRAW 0x005

	#ifdef CONFIG_FB_TILEBLITTING
	extern void fbcon_set_tileops(struct vc_data vc, struct fb_info info);
	#endif
	extern void fbcon_set_bitops(struct fbcon_ops *ops);
	extern int soft_cursor(struct fb_info info, struct fb_cursor cursor);

	#define FBCON_ATTRIBUTE_UNDERLINE 1
	#define FBCON_ATTRIBUTE_REVERSE 2
	#define FBCON_ATTRIBUTE_BOLD 4

	static inline int real_y(struct display *p, int ypos)
	{
	int rows = p->vrows;

	ypos += p->yscroll;
	return ypos < rows ? ypos : ypos - rows;
	}


	static inline int get_attribute(struct fb_info *info, u16 c)
	{
	int attribute = 0;

	if (fb_get_color_depth(&info->var, &info->fix) == 1) {
	if (attr_underline(c))
	attribute \|= FBCON_ATTRIBUTE_UNDERLINE;
	if (attr_reverse(c))
	attribute \|= FBCON_ATTRIBUTE_REVERSE;
	if (attr_bold(c))
	attribute \|= FBCON_ATTRIBUTE_BOLD;
	}

	return attribute;
	}

	#define FBCON_SWAP(i,r,v) ({ \
	typeof(r) _r = (r); \
	typeof(v) _v = (v); \
	(void) (&_r == &_v); \
	(i == FB_ROTATE_UR \|\| i == FB_ROTATE_UD) ? _r : _v; })

	#ifdef CONFIG_FRAMEBUFFER_CONSOLE_ROTATION
	extern void fbcon_set_rotate(struct fbcon_ops *ops);
	#else
	#define fbcon_set_rotate(x) do {} while(0)
	#endif /* CONFIG_FRAMEBUFFER_CONSOLE_ROTATION */

	#endif /* _VIDEO_FBCON_H */