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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 <arch/mm/page.h>
  33. #include <synch/spinlock.h>
  34. #include <arch/types.h>
  35. #include <arch/asm.h>
  36. #include <memstr.h>
  37.  
  38. /*
  39.  * The EGA driver.
  40.  * Simple and short. Function for displaying characters and "scrolling".
  41.  */
  42.  
  43. static spinlock_t egalock;
  44. static __u32 ega_cursor;
  45.  
  46. void ega_move_cursor(void);
  47.  
  48. void ega_init(void)
  49. {
  50.     __u8 hi, lo;
  51.  
  52.     map_page_to_frame(PA2KA(VIDEORAM), VIDEORAM, PAGE_NOT_CACHEABLE, 0);
  53.     outb(0x3d4,0xe);
  54.     hi = inb(0x3d5);
  55.     outb(0x3d4,0xf);
  56.     lo = inb(0x3d5);
  57.     ega_cursor = (hi<<8)|lo;
  58.     ega_putchar('\n');
  59. }
  60.  
  61. static void ega_display_char(char ch)
  62. {
  63.     __u8 *vram = (__u8 *) PA2KA(VIDEORAM);
  64.    
  65.     vram[ega_cursor*2] = ch;
  66. }
  67.  
  68. /*
  69.  * This function takes care of scrolling.
  70.  */
  71. static void ega_check_cursor(void)
  72. {
  73.     if (ega_cursor < SCREEN)
  74.         return;
  75.  
  76.     memcpy((void *)PA2KA(VIDEORAM), (void *)(PA2KA(VIDEORAM) + ROW*2), (SCREEN - ROW)*2);
  77.     memsetw(PA2KA(VIDEORAM) + (SCREEN - ROW)*2, ROW, 0x0720);
  78.     ega_cursor = ega_cursor - ROW;
  79. }
  80.  
  81. void ega_putchar(const char ch)
  82. {
  83.     ipl_t ipl;
  84.  
  85.     ipl = interrupts_disable();
  86.     spinlock_lock(&egalock);
  87.  
  88.     switch (ch) {
  89.         case '\n':
  90.         ega_cursor = (ega_cursor + ROW) - ega_cursor % ROW;
  91.         break;
  92.         case '\t':
  93.         ega_cursor = (ega_cursor + 8) - ega_cursor % 8;
  94.         break;
  95.         default:
  96.         ega_display_char(ch);
  97.         ega_cursor++;
  98.         break;
  99.         }
  100.     ega_check_cursor();
  101.     ega_move_cursor();
  102.  
  103.     spinlock_unlock(&egalock);
  104.     interrupts_restore(ipl);
  105. }
  106.  
  107. void ega_move_cursor(void)
  108. {
  109.     outb(0x3d4,0xe);
  110.     outb(0x3d5,(ega_cursor>>8)&0xff);
  111.     outb(0x3d4,0xf);
  112.     outb(0x3d5,ega_cursor&0xff);   
  113. }
  114.  
  115. void putchar(const char ch)
  116. {
  117.     ega_putchar(ch);
  118. }
  119.