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 18 #include <asm/io.h> 19 20 #define FBCON_FLAGS_INIT 1 21 #define FBCON_FLAGS_CURSOR_TIMER 2 22 23 /* 24 * This is the interface between the low-level console driver and the 25 * low-level frame buffer device 26 */ 27 28 struct display { 29 /* Filled in by the low-level console driver */ 30 const u_char *fontdata; 31 int userfont; /* != 0 if fontdata kmalloc()ed */ 32 u_short scrollmode; /* Scroll Method */ 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 softback_lines, 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 timer_list cursor_timer; /* Cursor timer */ 70 struct fb_cursor cursor_state; 71 struct display *p; 72 int currcon; /* Current VC. */ 73 int cur_blink_jiffies; 74 int cursor_flash; 75 int cursor_reset; 76 int blank_state; 77 int graphics; 78 int save_graphics; /* for debug enter/leave */ 79 int flags; 80 int rotate; 81 int cur_rotate; 82 char *cursor_data; 83 u8 *fontbuffer; 84 u8 *fontdata; 85 u8 *cursor_src; 86 u32 cursor_size; 87 u32 fd_size; 88 }; 89 /* 90 * Attribute Decoding 91 */ 92 93 /* Color */ 94 #define attr_fgcol(fgshift,s) \ 95 (((s) >> (fgshift)) & 0x0f) 96 #define attr_bgcol(bgshift,s) \ 97 (((s) >> (bgshift)) & 0x0f) 98 99 /* Monochrome */ 100 #define attr_bold(s) \ 101 ((s) & 0x200) 102 #define attr_reverse(s) \ 103 ((s) & 0x800) 104 #define attr_underline(s) \ 105 ((s) & 0x400) 106 #define attr_blink(s) \ 107 ((s) & 0x8000) 108 109 110 static inline int mono_col(const struct fb_info *info) 111 { 112 __u32 max_len; 113 max_len = max(info->var.green.length, info->var.red.length); 114 max_len = max(info->var.blue.length, max_len); 115 return (~(0xfff << max_len)) & 0xff; 116 } 117 118 static inline int attr_col_ec(int shift, struct vc_data *vc, 119 struct fb_info *info, int is_fg) 120 { 121 int is_mono01; 122 int col; 123 int fg; 124 int bg; 125 126 if (!vc) 127 return 0; 128 129 if (vc->vc_can_do_color) 130 return is_fg ? attr_fgcol(shift,vc->vc_video_erase_char) 131 : attr_bgcol(shift,vc->vc_video_erase_char); 132 133 if (!info) 134 return 0; 135 136 col = mono_col(info); 137 is_mono01 = info->fix.visual == FB_VISUAL_MONO01; 138 139 if (attr_reverse(vc->vc_video_erase_char)) { 140 fg = is_mono01 ? col : 0; 141 bg = is_mono01 ? 0 : col; 142 } 143 else { 144 fg = is_mono01 ? 0 : col; 145 bg = is_mono01 ? col : 0; 146 } 147 148 return is_fg ? fg : bg; 149 } 150 151 #define attr_bgcol_ec(bgshift, vc, info) attr_col_ec(bgshift, vc, info, 0) 152 #define attr_fgcol_ec(fgshift, vc, info) attr_col_ec(fgshift, vc, info, 1) 153 154 /* Font */ 155 #define REFCOUNT(fd) (((int *)(fd))[-1]) 156 #define FNTSIZE(fd) (((int *)(fd))[-2]) 157 #define FNTCHARCNT(fd) (((int *)(fd))[-3]) 158 #define FNTSUM(fd) (((int *)(fd))[-4]) 159 #define FONT_EXTRA_WORDS 4 160 161 /* 162 * Scroll Method 163 */ 164 165 /* There are several methods fbcon can use to move text around the screen: 166 * 167 * Operation Pan Wrap 168 *--------------------------------------------- 169 * SCROLL_MOVE copyarea No No 170 * SCROLL_PAN_MOVE copyarea Yes No 171 * SCROLL_WRAP_MOVE copyarea No Yes 172 * SCROLL_REDRAW imageblit No No 173 * SCROLL_PAN_REDRAW imageblit Yes No 174 * SCROLL_WRAP_REDRAW imageblit No Yes 175 * 176 * (SCROLL_WRAP_REDRAW is not implemented yet) 177 * 178 * In general, fbcon will choose the best scrolling 179 * method based on the rule below: 180 * 181 * Pan/Wrap > accel imageblit > accel copyarea > 182 * soft imageblit > (soft copyarea) 183 * 184 * Exception to the rule: Pan + accel copyarea is 185 * preferred over Pan + accel imageblit. 186 * 187 * The above is typical for PCI/AGP cards. Unless 188 * overridden, fbcon will never use soft copyarea. 189 * 190 * If you need to override the above rule, set the 191 * appropriate flags in fb_info->flags. For example, 192 * to prefer copyarea over imageblit, set 193 * FBINFO_READS_FAST. 194 * 195 * Other notes: 196 * + use the hardware engine to move the text 197 * (hw-accelerated copyarea() and fillrect()) 198 * + use hardware-supported panning on a large virtual screen 199 * + amifb can not only pan, but also wrap the display by N lines 200 * (i.e. visible line i = physical line (i+N) % yres). 201 * + read what's already rendered on the screen and 202 * write it in a different place (this is cfb_copyarea()) 203 * + re-render the text to the screen 204 * 205 * Whether to use wrapping or panning can only be figured out at 206 * runtime (when we know whether our font height is a multiple 207 * of the pan/wrap step) 208 * 209 */ 210 211 #define SCROLL_MOVE 0x001 212 #define SCROLL_PAN_MOVE 0x002 213 #define SCROLL_WRAP_MOVE 0x003 214 #define SCROLL_REDRAW 0x004 215 #define SCROLL_PAN_REDRAW 0x005 216 217 #ifdef CONFIG_FB_TILEBLITTING 218 extern void fbcon_set_tileops(struct vc_data *vc, struct fb_info *info); 219 #endif 220 extern void fbcon_set_bitops(struct fbcon_ops *ops); 221 extern int soft_cursor(struct fb_info *info, struct fb_cursor *cursor); 222 223 #define FBCON_ATTRIBUTE_UNDERLINE 1 224 #define FBCON_ATTRIBUTE_REVERSE 2 225 #define FBCON_ATTRIBUTE_BOLD 4 226 227 static inline int real_y(struct display *p, int ypos) 228 { 229 int rows = p->vrows; 230 231 ypos += p->yscroll; 232 return ypos < rows ? ypos : ypos - rows; 233 } 234 235 236 static inline int get_attribute(struct fb_info *info, u16 c) 237 { 238 int attribute = 0; 239 240 if (fb_get_color_depth(&info->var, &info->fix) == 1) { 241 if (attr_underline(c)) 242 attribute |= FBCON_ATTRIBUTE_UNDERLINE; 243 if (attr_reverse(c)) 244 attribute |= FBCON_ATTRIBUTE_REVERSE; 245 if (attr_bold(c)) 246 attribute |= FBCON_ATTRIBUTE_BOLD; 247 } 248 249 return attribute; 250 } 251 252 #define FBCON_SWAP(i,r,v) ({ \ 253 typeof(r) _r = (r); \ 254 typeof(v) _v = (v); \ 255 (void) (&_r == &_v); \ 256 (i == FB_ROTATE_UR || i == FB_ROTATE_UD) ? _r : _v; }) 257 258 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_ROTATION 259 extern void fbcon_set_rotate(struct fbcon_ops *ops); 260 #else 261 #define fbcon_set_rotate(x) do {} while(0) 262 #endif /* CONFIG_FRAMEBUFFER_CONSOLE_ROTATION */ 263 264 #ifdef CONFIG_DMI 265 int fbcon_platform_get_rotate(struct fb_info *info); 266 #else 267 #define fbcon_platform_get_rotate(i) FB_ROTATE_UR 268 #endif /* CONFIG_DMI */ 269 270 #endif /* _VIDEO_FBCON_H */ 271