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 u_short inverse; /* != 0 text black on white as default */ 34 short yscroll; /* Hardware scrolling */ 35 int vrows; /* number of virtual rows */ 36 int cursor_shape; 37 int con_rotate; 38 u32 xres_virtual; 39 u32 yres_virtual; 40 u32 height; 41 u32 width; 42 u32 bits_per_pixel; 43 u32 grayscale; 44 u32 nonstd; 45 u32 accel_flags; 46 u32 rotate; 47 struct fb_bitfield red; 48 struct fb_bitfield green; 49 struct fb_bitfield blue; 50 struct fb_bitfield transp; 51 const struct fb_videomode *mode; 52 }; 53 54 struct fbcon_ops { 55 void (*bmove)(struct vc_data *vc, struct fb_info *info, int sy, 56 int sx, int dy, int dx, int height, int width); 57 void (*clear)(struct vc_data *vc, struct fb_info *info, int sy, 58 int sx, int height, int width); 59 void (*putcs)(struct vc_data *vc, struct fb_info *info, 60 const unsigned short *s, int count, int yy, int xx, 61 int fg, int bg); 62 void (*clear_margins)(struct vc_data *vc, struct fb_info *info, 63 int color, int bottom_only); 64 void (*cursor)(struct vc_data *vc, struct fb_info *info, int mode, 65 int fg, int bg); 66 int (*update_start)(struct fb_info *info); 67 int (*rotate_font)(struct fb_info *info, struct vc_data *vc); 68 struct fb_var_screeninfo var; /* copy of the current fb_var_screeninfo */ 69 struct delayed_work cursor_work; /* Cursor timer */ 70 struct fb_cursor cursor_state; 71 struct fbcon_display *p; 72 struct fb_info *info; 73 int currcon; /* Current VC. */ 74 int cur_blink_jiffies; 75 int cursor_flash; 76 int cursor_reset; 77 int blank_state; 78 int graphics; 79 int save_graphics; /* for debug enter/leave */ 80 bool initialized; 81 int rotate; 82 int cur_rotate; 83 char *cursor_data; 84 u8 *fontbuffer; 85 u8 *fontdata; 86 u8 *cursor_src; 87 u32 cursor_size; 88 u32 fd_size; 89 }; 90 /* 91 * Attribute Decoding 92 */ 93 94 /* Color */ 95 #define attr_fgcol(fgshift,s) \ 96 (((s) >> (fgshift)) & 0x0f) 97 #define attr_bgcol(bgshift,s) \ 98 (((s) >> (bgshift)) & 0x0f) 99 100 /* Monochrome */ 101 #define attr_bold(s) \ 102 ((s) & 0x200) 103 #define attr_reverse(s) \ 104 ((s) & 0x800) 105 #define attr_underline(s) \ 106 ((s) & 0x400) 107 #define attr_blink(s) \ 108 ((s) & 0x8000) 109 110 111 static inline int mono_col(const struct fb_info *info) 112 { 113 __u32 max_len; 114 max_len = max(info->var.green.length, info->var.red.length); 115 max_len = max(info->var.blue.length, max_len); 116 return (~(0xfff << max_len)) & 0xff; 117 } 118 119 static inline int attr_col_ec(int shift, struct vc_data *vc, 120 struct fb_info *info, int is_fg) 121 { 122 int is_mono01; 123 int col; 124 int fg; 125 int bg; 126 127 if (!vc) 128 return 0; 129 130 if (vc->vc_can_do_color) 131 return is_fg ? attr_fgcol(shift,vc->vc_video_erase_char) 132 : attr_bgcol(shift,vc->vc_video_erase_char); 133 134 if (!info) 135 return 0; 136 137 col = mono_col(info); 138 is_mono01 = info->fix.visual == FB_VISUAL_MONO01; 139 140 if (attr_reverse(vc->vc_video_erase_char)) { 141 fg = is_mono01 ? col : 0; 142 bg = is_mono01 ? 0 : col; 143 } 144 else { 145 fg = is_mono01 ? 0 : col; 146 bg = is_mono01 ? col : 0; 147 } 148 149 return is_fg ? fg : bg; 150 } 151 152 #define attr_bgcol_ec(bgshift, vc, info) attr_col_ec(bgshift, vc, info, 0) 153 #define attr_fgcol_ec(fgshift, vc, info) attr_col_ec(fgshift, vc, info, 1) 154 155 /* 156 * Scroll Method 157 */ 158 159 /* There are several methods fbcon can use to move text around the screen: 160 * 161 * Operation Pan Wrap 162 *--------------------------------------------- 163 * SCROLL_MOVE copyarea No No 164 * SCROLL_PAN_MOVE copyarea Yes No 165 * SCROLL_WRAP_MOVE copyarea No Yes 166 * SCROLL_REDRAW imageblit No No 167 * SCROLL_PAN_REDRAW imageblit Yes No 168 * SCROLL_WRAP_REDRAW imageblit No Yes 169 * 170 * (SCROLL_WRAP_REDRAW is not implemented yet) 171 * 172 * In general, fbcon will choose the best scrolling 173 * method based on the rule below: 174 * 175 * Pan/Wrap > accel imageblit > accel copyarea > 176 * soft imageblit > (soft copyarea) 177 * 178 * Exception to the rule: Pan + accel copyarea is 179 * preferred over Pan + accel imageblit. 180 * 181 * The above is typical for PCI/AGP cards. Unless 182 * overridden, fbcon will never use soft copyarea. 183 * 184 * If you need to override the above rule, set the 185 * appropriate flags in fb_info->flags. For example, 186 * to prefer copyarea over imageblit, set 187 * FBINFO_READS_FAST. 188 * 189 * Other notes: 190 * + use the hardware engine to move the text 191 * (hw-accelerated copyarea() and fillrect()) 192 * + use hardware-supported panning on a large virtual screen 193 * + amifb can not only pan, but also wrap the display by N lines 194 * (i.e. visible line i = physical line (i+N) % yres). 195 * + read what's already rendered on the screen and 196 * write it in a different place (this is cfb_copyarea()) 197 * + re-render the text to the screen 198 * 199 * Whether to use wrapping or panning can only be figured out at 200 * runtime (when we know whether our font height is a multiple 201 * of the pan/wrap step) 202 * 203 */ 204 205 #define SCROLL_MOVE 0x001 206 #define SCROLL_PAN_MOVE 0x002 207 #define SCROLL_WRAP_MOVE 0x003 208 #define SCROLL_REDRAW 0x004 209 #define SCROLL_PAN_REDRAW 0x005 210 211 static inline u_short fb_scrollmode(struct fbcon_display *fb) 212 { 213 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_LEGACY_ACCELERATION 214 return fb->scrollmode; 215 #else 216 /* hardcoded to SCROLL_REDRAW if acceleration was disabled. */ 217 return SCROLL_REDRAW; 218 #endif 219 } 220 221 222 #ifdef CONFIG_FB_TILEBLITTING 223 extern void fbcon_set_tileops(struct vc_data *vc, struct fb_info *info); 224 #endif 225 extern void fbcon_set_bitops(struct fbcon_ops *ops); 226 extern int soft_cursor(struct fb_info *info, struct fb_cursor *cursor); 227 228 #define FBCON_ATTRIBUTE_UNDERLINE 1 229 #define FBCON_ATTRIBUTE_REVERSE 2 230 #define FBCON_ATTRIBUTE_BOLD 4 231 232 static inline int real_y(struct fbcon_display *p, int ypos) 233 { 234 int rows = p->vrows; 235 236 ypos += p->yscroll; 237 return ypos < rows ? ypos : ypos - rows; 238 } 239 240 241 static inline int get_attribute(struct fb_info *info, u16 c) 242 { 243 int attribute = 0; 244 245 if (fb_get_color_depth(&info->var, &info->fix) == 1) { 246 if (attr_underline(c)) 247 attribute |= FBCON_ATTRIBUTE_UNDERLINE; 248 if (attr_reverse(c)) 249 attribute |= FBCON_ATTRIBUTE_REVERSE; 250 if (attr_bold(c)) 251 attribute |= FBCON_ATTRIBUTE_BOLD; 252 } 253 254 return attribute; 255 } 256 257 #define FBCON_SWAP(i,r,v) ({ \ 258 typeof(r) _r = (r); \ 259 typeof(v) _v = (v); \ 260 (void) (&_r == &_v); \ 261 (i == FB_ROTATE_UR || i == FB_ROTATE_UD) ? _r : _v; }) 262 263 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_ROTATION 264 extern void fbcon_set_rotate(struct fbcon_ops *ops); 265 #else 266 #define fbcon_set_rotate(x) do {} while(0) 267 #endif /* CONFIG_FRAMEBUFFER_CONSOLE_ROTATION */ 268 269 #endif /* _VIDEO_FBCON_H */ 270