1 /* 2 * linux/drivers/video/console/fbcon.h -- Low level frame buffer based console driver 3 * 4 * Copyright (C) 1997 Geert Uytterhoeven 5 * 6 * This file is subject to the terms and conditions of the GNU General Public 7 * License. See the file COPYING in the main directory of this archive 8 * for more details. 9 */ 10 11 #ifndef _VIDEO_FBCON_H 12 #define _VIDEO_FBCON_H 13 14 #include <linux/types.h> 15 #include <linux/vt_buffer.h> 16 #include <linux/vt_kern.h> 17 #include <linux/workqueue.h> 18 19 #include <asm/io.h> 20 21 /* 22 * This is the interface between the low-level console driver and the 23 * low-level frame buffer device 24 */ 25 26 struct fbcon_display { 27 /* Filled in by the low-level console driver */ 28 const u_char *fontdata; 29 int userfont; /* != 0 if fontdata kmalloc()ed */ 30 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_LEGACY_ACCELERATION 31 u_short scrollmode; /* Scroll Method, use fb_scrollmode() */ 32 #endif 33 short yscroll; /* Hardware scrolling */ 34 int vrows; /* number of virtual rows */ 35 int cursor_shape; 36 int con_rotate; 37 u32 xres_virtual; 38 u32 yres_virtual; 39 u32 height; 40 u32 width; 41 u32 bits_per_pixel; 42 u32 grayscale; 43 u32 nonstd; 44 u32 accel_flags; 45 u32 rotate; 46 struct fb_bitfield red; 47 struct fb_bitfield green; 48 struct fb_bitfield blue; 49 struct fb_bitfield transp; 50 const struct fb_videomode *mode; 51 }; 52 53 struct fbcon_bitops { 54 void (*bmove)(struct vc_data *vc, struct fb_info *info, int sy, 55 int sx, int dy, int dx, int height, int width); 56 void (*clear)(struct vc_data *vc, struct fb_info *info, int sy, 57 int sx, int height, int width, int fb, int bg); 58 void (*putcs)(struct vc_data *vc, struct fb_info *info, 59 const unsigned short *s, int count, int yy, int xx, 60 int fg, int bg); 61 void (*clear_margins)(struct vc_data *vc, struct fb_info *info, 62 int color, int bottom_only); 63 void (*cursor)(struct vc_data *vc, struct fb_info *info, 64 bool enable, int fg, int bg); 65 int (*update_start)(struct fb_info *info); 66 int (*rotate_font)(struct fb_info *info, struct vc_data *vc); 67 }; 68 69 struct fbcon_par { 70 struct fb_var_screeninfo var; /* copy of the current fb_var_screeninfo */ 71 struct delayed_work cursor_work; /* Cursor timer */ 72 struct fb_cursor cursor_state; 73 struct fbcon_display *p; 74 struct fb_info *info; 75 int currcon; /* Current VC. */ 76 int cur_blink_jiffies; 77 int cursor_flash; 78 int cursor_reset; 79 int blank_state; 80 int graphics; 81 bool initialized; 82 int rotate; 83 int cur_rotate; 84 char *cursor_data; 85 u8 *fontbuffer; 86 u8 *fontdata; 87 u8 *cursor_src; 88 u32 cursor_size; 89 u32 fd_size; 90 91 const struct fbcon_bitops *bitops; 92 }; 93 94 /* 95 * Attribute Decoding 96 */ 97 98 /* Color */ 99 #define attr_fgcol(fgshift,s) \ 100 (((s) >> (fgshift)) & 0x0f) 101 #define attr_bgcol(bgshift,s) \ 102 (((s) >> (bgshift)) & 0x0f) 103 104 /* Monochrome */ 105 #define attr_bold(s) \ 106 ((s) & 0x200) 107 #define attr_reverse(s) \ 108 ((s) & 0x800) 109 #define attr_underline(s) \ 110 ((s) & 0x400) 111 #define attr_blink(s) \ 112 ((s) & 0x8000) 113 114 static inline int mono_col(const struct fb_info *info) 115 { 116 __u32 max_len; 117 max_len = max(info->var.green.length, info->var.red.length); 118 max_len = max(info->var.blue.length, max_len); 119 return (~(0xfff << max_len)) & 0xff; 120 } 121 122 /* 123 * Scroll Method 124 */ 125 126 /* There are several methods fbcon can use to move text around the screen: 127 * 128 * Operation Pan Wrap 129 *--------------------------------------------- 130 * SCROLL_MOVE copyarea No No 131 * SCROLL_PAN_MOVE copyarea Yes No 132 * SCROLL_WRAP_MOVE copyarea No Yes 133 * SCROLL_REDRAW imageblit No No 134 * SCROLL_PAN_REDRAW imageblit Yes No 135 * SCROLL_WRAP_REDRAW imageblit No Yes 136 * 137 * (SCROLL_WRAP_REDRAW is not implemented yet) 138 * 139 * In general, fbcon will choose the best scrolling 140 * method based on the rule below: 141 * 142 * Pan/Wrap > accel imageblit > accel copyarea > 143 * soft imageblit > (soft copyarea) 144 * 145 * Exception to the rule: Pan + accel copyarea is 146 * preferred over Pan + accel imageblit. 147 * 148 * The above is typical for PCI/AGP cards. Unless 149 * overridden, fbcon will never use soft copyarea. 150 * 151 * If you need to override the above rule, set the 152 * appropriate flags in fb_info->flags. For example, 153 * to prefer copyarea over imageblit, set 154 * FBINFO_READS_FAST. 155 * 156 * Other notes: 157 * + use the hardware engine to move the text 158 * (hw-accelerated copyarea() and fillrect()) 159 * + use hardware-supported panning on a large virtual screen 160 * + amifb can not only pan, but also wrap the display by N lines 161 * (i.e. visible line i = physical line (i+N) % yres). 162 * + read what's already rendered on the screen and 163 * write it in a different place (this is cfb_copyarea()) 164 * + re-render the text to the screen 165 * 166 * Whether to use wrapping or panning can only be figured out at 167 * runtime (when we know whether our font height is a multiple 168 * of the pan/wrap step) 169 * 170 */ 171 172 #define SCROLL_MOVE 0x001 173 #define SCROLL_PAN_MOVE 0x002 174 #define SCROLL_WRAP_MOVE 0x003 175 #define SCROLL_REDRAW 0x004 176 #define SCROLL_PAN_REDRAW 0x005 177 178 static inline u_short fb_scrollmode(struct fbcon_display *fb) 179 { 180 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_LEGACY_ACCELERATION 181 return fb->scrollmode; 182 #else 183 /* hardcoded to SCROLL_REDRAW if acceleration was disabled. */ 184 return SCROLL_REDRAW; 185 #endif 186 } 187 188 189 #ifdef CONFIG_FB_TILEBLITTING 190 extern void fbcon_set_tileops(struct vc_data *vc, struct fb_info *info); 191 #endif 192 extern void fbcon_set_bitops_ur(struct fbcon_par *par); 193 extern int soft_cursor(struct fb_info *info, struct fb_cursor *cursor); 194 195 #define FBCON_ATTRIBUTE_UNDERLINE 1 196 #define FBCON_ATTRIBUTE_REVERSE 2 197 #define FBCON_ATTRIBUTE_BOLD 4 198 199 static inline int real_y(struct fbcon_display *p, int ypos) 200 { 201 int rows = p->vrows; 202 203 ypos += p->yscroll; 204 return ypos < rows ? ypos : ypos - rows; 205 } 206 207 208 static inline int get_attribute(struct fb_info *info, u16 c) 209 { 210 int attribute = 0; 211 212 if (fb_get_color_depth(&info->var, &info->fix) == 1) { 213 if (attr_underline(c)) 214 attribute |= FBCON_ATTRIBUTE_UNDERLINE; 215 if (attr_reverse(c)) 216 attribute |= FBCON_ATTRIBUTE_REVERSE; 217 if (attr_bold(c)) 218 attribute |= FBCON_ATTRIBUTE_BOLD; 219 } 220 221 return attribute; 222 } 223 224 #define FBCON_SWAP(i,r,v) ({ \ 225 typeof(r) _r = (r); \ 226 typeof(v) _v = (v); \ 227 (void) (&_r == &_v); \ 228 (i == FB_ROTATE_UR || i == FB_ROTATE_UD) ? _r : _v; }) 229 230 #endif /* _VIDEO_FBCON_H */ 231