drivers/video/fbcon-vga.c

   1 /*
   2  *  linux/drivers/video/fbcon-vga.c -- Low level frame buffer operations for
   3  *                                     VGA characters/attributes
   4  *
   5  *      Created 28 Mar 1998 by Geert Uytterhoeven
   6  *      Monochrome attributes added May 1998 by Andrew Apted
   7  *
   8  *  This file is subject to the terms and conditions of the GNU General Public
   9  *  License.  See the file COPYING in the main directory of this archive for
  10  *  more details.
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/tty.h>
  15 #include <linux/console.h>
  16 #include <linux/string.h>
  17 #include <linux/fb.h>
  18
  19 #include <asm/io.h>
  20
  21 #include <video/fbcon.h>
  22 #include <video/fbcon-vga.h>
  23
  24
  25     /*
  26      *  VGA screen access
  27      */
  28
  29 static inline void vga_writew(u16 val, u16 *addr)
  30 {
  31 #ifdef __powerpc__
  32     st_le16(addr, val);
  33 #else
  34     writew(val, (unsigned long)addr);
  35 #endif /* !__powerpc__ */
  36 }
  37
  38 static inline u16 vga_readw(u16 *addr)
  39 {
  40 #ifdef __powerpc__
  41     return ld_le16(addr);
  42 #else
  43     return readw((unsigned long)addr);
  44 #endif /* !__powerpc__ */
  45 }
  46
  47 static inline void vga_memsetw(void *s, u16 c, unsigned int count)
  48 {
  49     u16 *addr = (u16 *)s;
  50
  51     while (count) {
  52         count--;
  53         vga_writew(c, addr++);
  54     }
  55 }
  56
  57 static inline void vga_memmovew(u16 *to, u16 *from, unsigned int count)
  58 {
  59     if (to < from) {
  60         while (count) {
  61             count--;
  62             vga_writew(vga_readw(from++), to++);
  63         }
  64     } else {
  65         from += count;
  66         to += count;
  67         while (count) {
  68             count--;
  69             vga_writew(vga_readw(--from), --to);
  70         }
  71     }
  72 }
  73
  74
  75     /*
  76      *  VGA characters/attributes
  77      */
  78
  79 static inline u16 fbcon_vga_attr(struct display *p,
  80                                  unsigned short s)
  81 {
  82         /* Underline and reverse-video are mutually exclusive on MDA.
  83          * Since reverse-video is used for cursors and selected areas,
  84          * it takes precedence.
  85          */
  86
  87         return (attr_reverse(p, s) ? 0x7000 :
  88                 (attr_underline(p, s) ? 0x0100 : 0x0700)) |
  89                (attr_bold(p, s) ? 0x0800 : 0) |
  90                (attr_blink(p, s) ? 0x8000 : 0);
  91 }
  92
  93 void fbcon_vga_setup(struct display *p)
  94 {
  95     p->next_line = p->line_length;
  96     p->next_plane = 0;
  97 }
  98
  99 void fbcon_vga_bmove(struct display *p, int sy, int sx, int dy, int dx,
 100                      int height, int width)
 101 {
 102     u16 *src, *dst;
 103     int rows;
 104
 105     if (sx == 0 && dx == 0 && width == p->next_line/2) {
 106         src = (u16 *)(p->screen_base+sy*p->next_line);
 107         dst = (u16 *)(p->screen_base+dy*p->next_line);
 108         vga_memmovew(dst, src, height*width);
 109     } else if (dy < sy || (dy == sy && dx < sx)) {
 110         src = (u16 *)(p->screen_base+sy*p->next_line+sx*2);
 111         dst = (u16 *)(p->screen_base+dy*p->next_line+dx*2);
 112         for (rows = height; rows-- ;) {
 113             vga_memmovew(dst, src, width);
 114             src += p->next_line/2;
 115             dst += p->next_line/2;
 116         }
 117     } else {
 118         src = (u16 *)(p->screen_base+(sy+height-1)*p->next_line+sx*2);
 119         dst = (u16 *)(p->screen_base+(dy+height-1)*p->next_line+dx*2);
 120         for (rows = height; rows-- ;) {
 121             vga_memmovew(dst, src, width);
 122             src -= p->next_line/2;
 123             dst -= p->next_line/2;
 124         }
 125     }
 126 }
 127
 128 void fbcon_vga_clear(struct vc_data *conp, struct display *p, int sy, int sx,
 129                      int height, int width)
 130 {
 131     u16 *dest = (u16 *)(p->screen_base+sy*p->next_line+sx*2);
 132     int rows;
 133
 134     if (sx == 0 && width*2 == p->next_line)
 135         vga_memsetw(dest, conp->vc_video_erase_char, height*width);
 136     else
 137         for (rows = height; rows-- ; dest += p->next_line/2)
 138             vga_memsetw(dest, conp->vc_video_erase_char, width);
 139 }
 140
 141 void fbcon_vga_putc(struct vc_data *conp, struct display *p, int c, int y,
 142                     int x)
 143 {
 144     u16 *dst = (u16 *)(p->screen_base+y*p->next_line+x*2);
 145     if (conp->vc_can_do_color)
 146         vga_writew(c, dst);
 147     else
 148         vga_writew(fbcon_vga_attr(p, c) | (c & 0xff), dst);
 149 }
 150
 151 void fbcon_vga_putcs(struct vc_data *conp, struct display *p,
 152                      const unsigned short *s, int count, int y, int x)
 153 {
 154     u16 *dst = (u16 *)(p->screen_base+y*p->next_line+x*2);
 155     u16 sattr;
 156     if (conp->vc_can_do_color)
 157         while (count--)
 158             vga_writew(scr_readw(s++), dst++);
 159     else {
 160         sattr = fbcon_vga_attr(p, scr_readw(s));
 161         while (count--)
 162             vga_writew(sattr | ((int) (scr_readw(s++)) & 0xff), dst++);
 163     }
 164 }
 165
 166 void fbcon_vga_revc(struct display *p, int x, int y)
 167 {
 168     u16 *dst = (u16 *)(p->screen_base+y*p->next_line+x*2);
 169     u16 val = vga_readw(dst);
 170     val = (val & 0x88ff) | ((val<<4) & 0x7000) | ((val>>4) & 0x0700);
 171     vga_writew(val, dst);
 172 }
 173
 174
 175     /*
 176      *  `switch' for the low level operations
 177      */
 178
 179 struct display_switch fbcon_vga = {
 180     fbcon_vga_setup, fbcon_vga_bmove, fbcon_vga_clear, fbcon_vga_putc,
 181     fbcon_vga_putcs, fbcon_vga_revc, NULL, NULL, NULL, FONTWIDTH(8)
 182 };
 183
 184
 185 #ifdef MODULE
 186 int init_module(void)
 187 {
 188     return 0;
 189 }
 190
 191 void cleanup_module(void)
 192 {}
 193 #endif /* MODULE */
 194
 195
 196     /*
 197      *  Visible symbols for modules
 198      */
 199
 200 EXPORT_SYMBOL(fbcon_vga);
 201 EXPORT_SYMBOL(fbcon_vga_setup);
 202 EXPORT_SYMBOL(fbcon_vga_bmove);
 203 EXPORT_SYMBOL(fbcon_vga_clear);
 204 EXPORT_SYMBOL(fbcon_vga_putc);
 205 EXPORT_SYMBOL(fbcon_vga_putcs);
 206 EXPORT_SYMBOL(fbcon_vga_revc);