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  1. /*
  2.  * Copyright (C) 2001-2004 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. #include <arch/ega.h>
  30. #include <putchar.h>
  31. #include <mm/page.h>
  32. #include <synch/spinlock.h>
  33. #include <arch/types.h>
  34. #include <arch/asm.h>
  35.  
  36. /*
  37.  * The EGA driver.
  38.  * Simple and short. Function for displaying characters and "scrolling".
  39.  */
  40.  
  41. static spinlock_t egalock;
  42. static __u32 ega_cursor;
  43.  
  44. void ega_move_cursor(void);
  45.  
  46. void ega_init(void)
  47. {
  48.     __u8 hi, lo;
  49.  
  50.     map_page_to_frame(VIDEORAM, VIDEORAM, PAGE_NOT_CACHEABLE, 0);
  51.     outb(0x3d4,0xe);
  52.     hi = inb(0x3d5);
  53.     outb(0x3d4,0xf);
  54.     lo = inb(0x3d5);
  55.     ega_cursor = (hi<<8)|lo;
  56.     ega_putchar('\n');
  57. }
  58.  
  59. void ega_display_char(char ch)
  60. {
  61.     __u8 *vram = (__u8 *) VIDEORAM;
  62.    
  63.     vram[ega_cursor*2] = ch;
  64. }
  65.  
  66. /*
  67.  * This function takes care of scrolling.
  68.  */
  69. void ega_check_cursor(void)
  70. {
  71.     if (ega_cursor < SCREEN)
  72.         return;
  73.  
  74.     memcopy(VIDEORAM + ROW*2, VIDEORAM, (SCREEN - ROW)*2);
  75.     memsetw(VIDEORAM + (SCREEN - ROW)*2, ROW, 0x0720);
  76.     ega_cursor = ega_cursor - ROW;
  77. }
  78.  
  79. void ega_putchar(char ch)
  80. {
  81.     pri_t pri;
  82.  
  83.     pri = cpu_priority_high();
  84.     spinlock_lock(&egalock);
  85.  
  86.     switch (ch) {
  87.         case '\n':
  88.             ega_cursor = (ega_cursor + ROW) - ega_cursor % ROW;
  89.             break;
  90.         case '\t':
  91.             ega_cursor = (ega_cursor + 8) - ega_cursor % 8;
  92.             break;
  93.         default:
  94.             ega_display_char(ch);
  95.             ega_cursor++;
  96.             break;
  97.         }
  98.     ega_check_cursor();
  99.     ega_move_cursor();
  100.        
  101.     spinlock_unlock(&egalock);
  102.     cpu_priority_restore(pri);
  103. }
  104.  
  105. void ega_move_cursor(void)
  106. {
  107.     outb(0x3d4,0xe);
  108.     outb(0x3d5,(ega_cursor>>8)&0xff);
  109.     outb(0x3d4,0xf);
  110.     outb(0x3d5,ega_cursor&0xff);   
  111. }
  112.  
  113. void putchar(char ch)
  114. {
  115.     ega_putchar(ch);
  116. }
  117.