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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 <mm/asid.h>
  33. #include <arch/mm/page.h>
  34. #include <synch/spinlock.h>
  35. #include <arch/types.h>
  36. #include <arch/asm.h>
  37. #include <memstr.h>
  38. #include <console/chardev.h>
  39. #include <console/console.h>
  40.  
  41. /*
  42.  * The EGA driver.
  43.  * Simple and short. Function for displaying characters and "scrolling".
  44.  */
  45.  
  46. SPINLOCK_INITIALIZE(egalock);
  47. static __u32 ega_cursor;
  48.  
  49. static void ega_putchar(chardev_t *d, const char ch);
  50.  
  51. chardev_t ega_console;
  52. static chardev_operations_t ega_ops = {
  53.     .write = ega_putchar
  54. };
  55.  
  56. void ega_move_cursor(void);
  57.  
  58. void ega_init(void)
  59. {
  60.     __u8 hi, lo;
  61.  
  62.     page_mapping_insert(PA2KA(VIDEORAM), ASID_KERNEL, VIDEORAM, PAGE_NOT_CACHEABLE, 0);
  63.     outb(0x3d4,0xe);
  64.     hi = inb(0x3d5);
  65.     outb(0x3d4,0xf);
  66.     lo = inb(0x3d5);
  67.     ega_cursor = (hi<<8)|lo;
  68.  
  69.     chardev_initialize("ega_out", &ega_console, &ega_ops);
  70.     stdout = &ega_console;
  71.  
  72.     putchar('\n');
  73. }
  74.  
  75. static void ega_display_char(char ch)
  76. {
  77.     __u8 *vram = (__u8 *) PA2KA(VIDEORAM);
  78.    
  79.     vram[ega_cursor*2] = ch;
  80. }
  81.  
  82. /*
  83.  * This function takes care of scrolling.
  84.  */
  85. static void ega_check_cursor(void)
  86. {
  87.     if (ega_cursor < SCREEN)
  88.         return;
  89.  
  90.     memcpy((void *)PA2KA(VIDEORAM), (void *)(PA2KA(VIDEORAM) + ROW*2), (SCREEN - ROW)*2);
  91.     memsetw(PA2KA(VIDEORAM) + (SCREEN - ROW)*2, ROW, 0x0720);
  92.     ega_cursor = ega_cursor - ROW;
  93. }
  94.  
  95. void ega_putchar(chardev_t *d, const char ch)
  96. {
  97.     ipl_t ipl;
  98.  
  99.     ipl = interrupts_disable();
  100.     spinlock_lock(&egalock);
  101.  
  102.     switch (ch) {
  103.     case '\n':
  104.         ega_cursor = (ega_cursor + ROW) - ega_cursor % ROW;
  105.         break;
  106.     case '\t':
  107.         ega_cursor = (ega_cursor + 8) - ega_cursor % 8;
  108.         break;
  109.     case '\b':
  110.         if (ega_cursor % ROW)
  111.             ega_cursor--;
  112.         break;
  113.     default:
  114.         ega_display_char(ch);
  115.         ega_cursor++;
  116.         break;
  117.         }
  118.     ega_check_cursor();
  119.     ega_move_cursor();
  120.  
  121.     spinlock_unlock(&egalock);
  122.     interrupts_restore(ipl);
  123. }
  124.  
  125. void ega_move_cursor(void)
  126. {
  127.     outb(0x3d4,0xe);
  128.     outb(0x3d5,(ega_cursor>>8)&0xff);
  129.     outb(0x3d4,0xf);
  130.     outb(0x3d5,ega_cursor&0xff);   
  131. }
  132.