270 lines
7.4 KiB
C
270 lines
7.4 KiB
C
/*
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* linux/drivers/video/console/fbcon.h -- Low level frame buffer based console driver
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*
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* Copyright (C) 1997 Geert Uytterhoeven
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive
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* for more details.
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*/
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#ifndef _VIDEO_FBCON_H
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#define _VIDEO_FBCON_H
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#include <linux/types.h>
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#include <linux/vt_buffer.h>
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#include <linux/vt_kern.h>
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#include <linux/workqueue.h>
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#include <asm/io.h>
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/*
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* This is the interface between the low-level console driver and the
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* low-level frame buffer device
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*/
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struct fbcon_display {
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/* Filled in by the low-level console driver */
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const u_char *fontdata;
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int userfont; /* != 0 if fontdata kmalloc()ed */
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#ifdef CONFIG_FRAMEBUFFER_CONSOLE_LEGACY_ACCELERATION
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u_short scrollmode; /* Scroll Method, use fb_scrollmode() */
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#endif
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u_short inverse; /* != 0 text black on white as default */
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short yscroll; /* Hardware scrolling */
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int vrows; /* number of virtual rows */
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int cursor_shape;
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int con_rotate;
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u32 xres_virtual;
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u32 yres_virtual;
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u32 height;
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u32 width;
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u32 bits_per_pixel;
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u32 grayscale;
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u32 nonstd;
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u32 accel_flags;
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u32 rotate;
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struct fb_bitfield red;
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struct fb_bitfield green;
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struct fb_bitfield blue;
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struct fb_bitfield transp;
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const struct fb_videomode *mode;
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};
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struct fbcon_ops {
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void (*bmove)(struct vc_data *vc, struct fb_info *info, int sy,
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int sx, int dy, int dx, int height, int width);
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void (*clear)(struct vc_data *vc, struct fb_info *info, int sy,
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int sx, int height, int width);
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void (*putcs)(struct vc_data *vc, struct fb_info *info,
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const unsigned short *s, int count, int yy, int xx,
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int fg, int bg);
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void (*clear_margins)(struct vc_data *vc, struct fb_info *info,
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int color, int bottom_only);
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void (*cursor)(struct vc_data *vc, struct fb_info *info,
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bool enable, int fg, int bg);
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int (*update_start)(struct fb_info *info);
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int (*rotate_font)(struct fb_info *info, struct vc_data *vc);
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struct fb_var_screeninfo var; /* copy of the current fb_var_screeninfo */
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struct delayed_work cursor_work; /* Cursor timer */
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struct fb_cursor cursor_state;
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struct fbcon_display *p;
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struct fb_info *info;
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int currcon; /* Current VC. */
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int cur_blink_jiffies;
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int cursor_flash;
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int cursor_reset;
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int blank_state;
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int graphics;
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int save_graphics; /* for debug enter/leave */
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bool initialized;
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int rotate;
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int cur_rotate;
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char *cursor_data;
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u8 *fontbuffer;
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u8 *fontdata;
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u8 *cursor_src;
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u32 cursor_size;
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u32 fd_size;
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};
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/*
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* Attribute Decoding
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*/
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/* Color */
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#define attr_fgcol(fgshift,s) \
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(((s) >> (fgshift)) & 0x0f)
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#define attr_bgcol(bgshift,s) \
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(((s) >> (bgshift)) & 0x0f)
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/* Monochrome */
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#define attr_bold(s) \
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((s) & 0x200)
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#define attr_reverse(s) \
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((s) & 0x800)
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#define attr_underline(s) \
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((s) & 0x400)
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#define attr_blink(s) \
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((s) & 0x8000)
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static inline int mono_col(const struct fb_info *info)
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{
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__u32 max_len;
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max_len = max(info->var.green.length, info->var.red.length);
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max_len = max(info->var.blue.length, max_len);
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return (~(0xfff << max_len)) & 0xff;
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}
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static inline int attr_col_ec(int shift, struct vc_data *vc,
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struct fb_info *info, int is_fg)
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{
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int is_mono01;
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int col;
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int fg;
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int bg;
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if (!vc)
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return 0;
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if (vc->vc_can_do_color)
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return is_fg ? attr_fgcol(shift,vc->vc_video_erase_char)
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: attr_bgcol(shift,vc->vc_video_erase_char);
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if (!info)
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return 0;
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col = mono_col(info);
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is_mono01 = info->fix.visual == FB_VISUAL_MONO01;
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if (attr_reverse(vc->vc_video_erase_char)) {
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fg = is_mono01 ? col : 0;
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bg = is_mono01 ? 0 : col;
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}
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else {
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fg = is_mono01 ? 0 : col;
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bg = is_mono01 ? col : 0;
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}
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return is_fg ? fg : bg;
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}
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#define attr_bgcol_ec(bgshift, vc, info) attr_col_ec(bgshift, vc, info, 0)
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#define attr_fgcol_ec(fgshift, vc, info) attr_col_ec(fgshift, vc, info, 1)
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/*
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* Scroll Method
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*/
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/* There are several methods fbcon can use to move text around the screen:
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*
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* Operation Pan Wrap
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*---------------------------------------------
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* SCROLL_MOVE copyarea No No
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* SCROLL_PAN_MOVE copyarea Yes No
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* SCROLL_WRAP_MOVE copyarea No Yes
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* SCROLL_REDRAW imageblit No No
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* SCROLL_PAN_REDRAW imageblit Yes No
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* SCROLL_WRAP_REDRAW imageblit No Yes
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*
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* (SCROLL_WRAP_REDRAW is not implemented yet)
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*
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* In general, fbcon will choose the best scrolling
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* method based on the rule below:
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*
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* Pan/Wrap > accel imageblit > accel copyarea >
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* soft imageblit > (soft copyarea)
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*
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* Exception to the rule: Pan + accel copyarea is
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* preferred over Pan + accel imageblit.
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*
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* The above is typical for PCI/AGP cards. Unless
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* overridden, fbcon will never use soft copyarea.
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*
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* If you need to override the above rule, set the
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* appropriate flags in fb_info->flags. For example,
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* to prefer copyarea over imageblit, set
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* FBINFO_READS_FAST.
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*
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* Other notes:
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* + use the hardware engine to move the text
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* (hw-accelerated copyarea() and fillrect())
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* + use hardware-supported panning on a large virtual screen
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* + amifb can not only pan, but also wrap the display by N lines
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* (i.e. visible line i = physical line (i+N) % yres).
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* + read what's already rendered on the screen and
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* write it in a different place (this is cfb_copyarea())
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* + re-render the text to the screen
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*
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* Whether to use wrapping or panning can only be figured out at
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* runtime (when we know whether our font height is a multiple
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* of the pan/wrap step)
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*
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*/
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#define SCROLL_MOVE 0x001
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#define SCROLL_PAN_MOVE 0x002
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#define SCROLL_WRAP_MOVE 0x003
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#define SCROLL_REDRAW 0x004
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#define SCROLL_PAN_REDRAW 0x005
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static inline u_short fb_scrollmode(struct fbcon_display *fb)
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{
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#ifdef CONFIG_FRAMEBUFFER_CONSOLE_LEGACY_ACCELERATION
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return fb->scrollmode;
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#else
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/* hardcoded to SCROLL_REDRAW if acceleration was disabled. */
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return SCROLL_REDRAW;
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#endif
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}
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#ifdef CONFIG_FB_TILEBLITTING
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extern void fbcon_set_tileops(struct vc_data *vc, struct fb_info *info);
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#endif
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extern void fbcon_set_bitops(struct fbcon_ops *ops);
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extern int soft_cursor(struct fb_info *info, struct fb_cursor *cursor);
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#define FBCON_ATTRIBUTE_UNDERLINE 1
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#define FBCON_ATTRIBUTE_REVERSE 2
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#define FBCON_ATTRIBUTE_BOLD 4
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static inline int real_y(struct fbcon_display *p, int ypos)
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{
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int rows = p->vrows;
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ypos += p->yscroll;
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return ypos < rows ? ypos : ypos - rows;
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}
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static inline int get_attribute(struct fb_info *info, u16 c)
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{
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int attribute = 0;
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if (fb_get_color_depth(&info->var, &info->fix) == 1) {
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if (attr_underline(c))
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attribute |= FBCON_ATTRIBUTE_UNDERLINE;
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if (attr_reverse(c))
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attribute |= FBCON_ATTRIBUTE_REVERSE;
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if (attr_bold(c))
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attribute |= FBCON_ATTRIBUTE_BOLD;
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}
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return attribute;
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}
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#define FBCON_SWAP(i,r,v) ({ \
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typeof(r) _r = (r); \
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typeof(v) _v = (v); \
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(void) (&_r == &_v); \
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(i == FB_ROTATE_UR || i == FB_ROTATE_UD) ? _r : _v; })
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#ifdef CONFIG_FRAMEBUFFER_CONSOLE_ROTATION
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extern void fbcon_set_rotate(struct fbcon_ops *ops);
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#else
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#define fbcon_set_rotate(x) do {} while(0)
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#endif /* CONFIG_FRAMEBUFFER_CONSOLE_ROTATION */
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#endif /* _VIDEO_FBCON_H */
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