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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. /** @addtogroup ia32   
  30.  * @{
  31.  */
  32. /**
  33.  * @file
  34.  * @brief EGA driver.
  35.  */
  36.  
  37. #include <putchar.h>
  38. #include <mm/page.h>
  39. #include <mm/as.h>
  40. #include <arch/mm/page.h>
  41. #include <synch/spinlock.h>
  42. #include <arch/types.h>
  43. #include <arch/asm.h>
  44. #include <memstr.h>
  45. #include <console/chardev.h>
  46. #include <console/console.h>
  47. #include <sysinfo/sysinfo.h>
  48. #include <arch/drivers/ega.h>
  49.  
  50. /*
  51.  * The EGA driver.
  52.  * Simple and short. Function for displaying characters and "scrolling".
  53.  */
  54.  
  55. SPINLOCK_INITIALIZE(egalock);
  56. static uint32_t ega_cursor;
  57. static uint8_t *videoram;
  58.  
  59. static void ega_putchar(chardev_t *d, const char ch);
  60.  
  61. chardev_t ega_console;
  62. static chardev_operations_t ega_ops = {
  63.     .write = ega_putchar
  64. };
  65.  
  66.  
  67. void ega_init(void)
  68. {
  69.     videoram = (uint8_t *) (VIDEORAM);
  70.  
  71.     /*
  72.      * Clear the screen.
  73.      */
  74.     _memsetw((uintptr_t) videoram, SCREEN, 0x0720);
  75.  
  76.     chardev_initialize("ega_out", &ega_console, &ega_ops);
  77.     stdout = &ega_console;
  78.    
  79.     sysinfo_set_item_val("fb", NULL, true);
  80.     sysinfo_set_item_val("fb.kind", NULL, 2);
  81.     sysinfo_set_item_val("fb.width", NULL, ROW);
  82.     sysinfo_set_item_val("fb.height", NULL, ROWS);
  83.     sysinfo_set_item_val("fb.address.physical", NULL, VIDEORAM);
  84.    
  85. #ifndef CONFIG_FB
  86.     putchar('\n');
  87. #endif 
  88. }
  89.  
  90. static void ega_display_char(char ch)
  91. {
  92.     videoram[ega_cursor * 2] = ch;
  93.     videoram[ega_cursor * 2 + 1] = 7;
  94. }
  95.  
  96. /*
  97.  * This function takes care of scrolling.
  98.  */
  99. static void ega_check_cursor(void)
  100. {
  101.     if (ega_cursor < SCREEN)
  102.         return;
  103.  
  104.     memcpy((void *) videoram, (void *) (videoram + ROW * 2), (SCREEN - ROW) * 2);
  105.     _memsetw((uintptr_t) (videoram + (SCREEN - ROW) * 2), ROW, 0x0720);
  106.     ega_cursor = ega_cursor - ROW;
  107. }
  108.  
  109. void ega_putchar(chardev_t *d, const char ch)
  110. {
  111.     ipl_t ipl;
  112.  
  113.     ipl = interrupts_disable();
  114.     spinlock_lock(&egalock);
  115.  
  116.     switch (ch) {
  117.     case '\n':
  118.         ega_cursor = (ega_cursor + ROW) - ega_cursor % ROW;
  119.         break;
  120.     case '\t':
  121.         ega_cursor = (ega_cursor + 8) - ega_cursor % 8;
  122.         break;
  123.     case '\b':
  124.         if (ega_cursor % ROW)
  125.             ega_cursor--;
  126.         break;
  127.     default:
  128.         ega_display_char(ch);
  129.         ega_cursor++;
  130.         break;
  131.     }
  132.     ega_check_cursor();
  133.  
  134.     spinlock_unlock(&egalock);
  135.     interrupts_restore(ipl);
  136. }
  137.  
  138. /** @}
  139.  */
  140.