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_bitops { 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, int fb, int bg); 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, 65 bool enable, 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 }; 69 70 struct fbcon_par { 71 struct fb_var_screeninfo var; /* copy of the current fb_var_screeninfo */ 72 struct delayed_work cursor_work; /* Cursor timer */ 73 struct fb_cursor cursor_state; 74 struct fbcon_display *p; 75 struct fb_info *info; 76 int currcon; /* Current VC. */ 77 int cur_blink_jiffies; 78 int cursor_flash; 79 int cursor_reset; 80 int blank_state; 81 int graphics; 82 bool initialized; 83 int rotate; 84 int cur_rotate; 85 char *cursor_data; 86 u8 *fontbuffer; 87 u8 *fontdata; 88 u8 *cursor_src; 89 u32 cursor_size; 90 u32 fd_size; 91 92 const struct fbcon_bitops *bitops; 93 }; 94 95 /* 96 * Attribute Decoding 97 */ 98 99 /* Color */ 100 #define attr_fgcol(fgshift,s) \ 101 (((s) >> (fgshift)) & 0x0f) 102 #define attr_bgcol(bgshift,s) \ 103 (((s) >> (bgshift)) & 0x0f) 104 105 /* Monochrome */ 106 #define attr_bold(s) \ 107 ((s) & 0x200) 108 #define attr_reverse(s) \ 109 ((s) & 0x800) 110 #define attr_underline(s) \ 111 ((s) & 0x400) 112 #define attr_blink(s) \ 113 ((s) & 0x8000) 114 115 static inline int mono_col(const struct fb_info *info) 116 { 117 __u32 max_len; 118 max_len = max(info->var.green.length, info->var.red.length); 119 max_len = max(info->var.blue.length, max_len); 120 return (~(0xfff << max_len)) & 0xff; 121 } 122 123 /* 124 * Scroll Method 125 */ 126 127 /* There are several methods fbcon can use to move text around the screen: 128 * 129 * Operation Pan Wrap 130 *--------------------------------------------- 131 * SCROLL_MOVE copyarea No No 132 * SCROLL_PAN_MOVE copyarea Yes No 133 * SCROLL_WRAP_MOVE copyarea No Yes 134 * SCROLL_REDRAW imageblit No No 135 * SCROLL_PAN_REDRAW imageblit Yes No 136 * SCROLL_WRAP_REDRAW imageblit No Yes 137 * 138 * (SCROLL_WRAP_REDRAW is not implemented yet) 139 * 140 * In general, fbcon will choose the best scrolling 141 * method based on the rule below: 142 * 143 * Pan/Wrap > accel imageblit > accel copyarea > 144 * soft imageblit > (soft copyarea) 145 * 146 * Exception to the rule: Pan + accel copyarea is 147 * preferred over Pan + accel imageblit. 148 * 149 * The above is typical for PCI/AGP cards. Unless 150 * overridden, fbcon will never use soft copyarea. 151 * 152 * If you need to override the above rule, set the 153 * appropriate flags in fb_info->flags. For example, 154 * to prefer copyarea over imageblit, set 155 * FBINFO_READS_FAST. 156 * 157 * Other notes: 158 * + use the hardware engine to move the text 159 * (hw-accelerated copyarea() and fillrect()) 160 * + use hardware-supported panning on a large virtual screen 161 * + amifb can not only pan, but also wrap the display by N lines 162 * (i.e. visible line i = physical line (i+N) % yres). 163 * + read what's already rendered on the screen and 164 * write it in a different place (this is cfb_copyarea()) 165 * + re-render the text to the screen 166 * 167 * Whether to use wrapping or panning can only be figured out at 168 * runtime (when we know whether our font height is a multiple 169 * of the pan/wrap step) 170 * 171 */ 172 173 #define SCROLL_MOVE 0x001 174 #define SCROLL_PAN_MOVE 0x002 175 #define SCROLL_WRAP_MOVE 0x003 176 #define SCROLL_REDRAW 0x004 177 #define SCROLL_PAN_REDRAW 0x005 178 179 static inline u_short fb_scrollmode(struct fbcon_display *fb) 180 { 181 #ifdef CONFIG_FRAMEBUFFER_CONSOLE_LEGACY_ACCELERATION 182 return fb->scrollmode; 183 #else 184 /* hardcoded to SCROLL_REDRAW if acceleration was disabled. */ 185 return SCROLL_REDRAW; 186 #endif 187 } 188 189 190 #ifdef CONFIG_FB_TILEBLITTING 191 extern void fbcon_set_tileops(struct vc_data *vc, struct fb_info *info); 192 #endif 193 extern void fbcon_set_bitops_ur(struct fbcon_par *par); 194 extern int soft_cursor(struct fb_info *info, struct fb_cursor *cursor); 195 196 #define FBCON_ATTRIBUTE_UNDERLINE 1 197 #define FBCON_ATTRIBUTE_REVERSE 2 198 #define FBCON_ATTRIBUTE_BOLD 4 199 200 static inline int real_y(struct fbcon_display *p, int ypos) 201 { 202 int rows = p->vrows; 203 204 ypos += p->yscroll; 205 return ypos < rows ? ypos : ypos - rows; 206 } 207 208 209 static inline int get_attribute(struct fb_info *info, u16 c) 210 { 211 int attribute = 0; 212 213 if (fb_get_color_depth(&info->var, &info->fix) == 1) { 214 if (attr_underline(c)) 215 attribute |= FBCON_ATTRIBUTE_UNDERLINE; 216 if (attr_reverse(c)) 217 attribute |= FBCON_ATTRIBUTE_REVERSE; 218 if (attr_bold(c)) 219 attribute |= FBCON_ATTRIBUTE_BOLD; 220 } 221 222 return attribute; 223 } 224 225 #define FBCON_SWAP(i,r,v) ({ \ 226 typeof(r) _r = (r); \ 227 typeof(v) _v = (v); \ 228 (void) (&_r == &_v); \ 229 (i == FB_ROTATE_UR || i == FB_ROTATE_UD) ? _r : _v; }) 230 231 #endif /* _VIDEO_FBCON_H */ 232