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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. #include <console/chardev.h>
  38. #include <console/console.h>
  39.  
  40. /*
  41.  * The EGA driver.
  42.  * Simple and short. Function for displaying characters and "scrolling".
  43.  */
  44.  
  45. static spinlock_t egalock;
  46. static __u32 ega_cursor;
  47.  
  48. static void ega_putchar(chardev_t *d, const char ch);
  49.  
  50. chardev_t ega_console;
  51. static chardev_operations_t ega_ops = {
  52.     .write = ega_putchar
  53. };
  54.  
  55. void ega_move_cursor(void);
  56.  
  57. void ega_init(void)
  58. {
  59.     __u8 hi, lo;
  60.  
  61.     page_mapping_insert(PA2KA(VIDEORAM), VIDEORAM, PAGE_NOT_CACHEABLE, 0);
  62.     outb(0x3d4,0xe);
  63.     hi = inb(0x3d5);
  64.     outb(0x3d4,0xf);
  65.     lo = inb(0x3d5);
  66.     ega_cursor = (hi<<8)|lo;
  67.  
  68.     chardev_initialize("ega_out", &ega_console, &ega_ops);
  69.     stdout = &ega_console;
  70.  
  71.     putchar('\n');
  72. }
  73.  
  74. static void ega_display_char(char ch)
  75. {
  76.     __u8 *vram = (__u8 *) PA2KA(VIDEORAM);
  77.    
  78.     vram[ega_cursor*2] = ch;
  79. }
  80.  
  81. /*
  82.  * This function takes care of scrolling.
  83.  */
  84. static void ega_check_cursor(void)
  85. {
  86.     if (ega_cursor < SCREEN)
  87.         return;
  88.  
  89.     memcpy((void *)PA2KA(VIDEORAM), (void *)(PA2KA(VIDEORAM) + ROW*2), (SCREEN - ROW)*2);
  90.     memsetw(PA2KA(VIDEORAM) + (SCREEN - ROW)*2, ROW, 0x0720);
  91.     ega_cursor = ega_cursor - ROW;
  92. }
  93.  
  94. void ega_putchar(chardev_t *d, const char ch)
  95. {
  96.     ipl_t ipl;
  97.  
  98.     ipl = interrupts_disable();
  99.     spinlock_lock(&egalock);
  100.  
  101.     switch (ch) {
  102.     case '\n':
  103.         ega_cursor = (ega_cursor + ROW) - ega_cursor % ROW;
  104.         break;
  105.     case '\t':
  106.         ega_cursor = (ega_cursor + 8) - ega_cursor % 8;
  107.         break;
  108.     case '\b':
  109.         if (ega_cursor % ROW)
  110.             ega_cursor--;
  111.         break;
  112.     default:
  113.         ega_display_char(ch);
  114.         ega_cursor++;
  115.         break;
  116.         }
  117.     ega_check_cursor();
  118.     ega_move_cursor();
  119.  
  120.     spinlock_unlock(&egalock);
  121.     interrupts_restore(ipl);
  122. }
  123.  
  124. void ega_move_cursor(void)
  125. {
  126.     outb(0x3d4,0xe);
  127.     outb(0x3d5,(ega_cursor>>8)&0xff);
  128.     outb(0x3d4,0xf);
  129.     outb(0x3d5,ega_cursor&0xff);   
  130. }
  131.