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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 <arch/drivers/ega.h>
  38. #include <putchar.h>
  39. #include <mm/page.h>
  40. #include <mm/as.h>
  41. #include <arch/mm/page.h>
  42. #include <synch/spinlock.h>
  43. #include <arch/types.h>
  44. #include <arch/asm.h>
  45. #include <memstr.h>
  46. #include <console/chardev.h>
  47. #include <console/console.h>
  48. #include <sysinfo/sysinfo.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. void ega_move_cursor(void);
  67.  
  68. void ega_init(void)
  69. {
  70.     uint8_t hi, lo;
  71.    
  72.     videoram = (uint8_t *) hw_map(VIDEORAM, SCREEN * 2);
  73.     outb(0x3d4, 0xe);
  74.     hi = inb(0x3d5);
  75.     outb(0x3d4, 0xf);
  76.     lo = inb(0x3d5);
  77.     ega_cursor = (hi << 8) | lo;
  78.  
  79.     chardev_initialize("ega_out", &ega_console, &ega_ops);
  80.     stdout = &ega_console;
  81.    
  82.     sysinfo_set_item_val("fb", NULL, true);
  83.     sysinfo_set_item_val("fb.kind", NULL, 2);
  84.     sysinfo_set_item_val("fb.width", NULL, ROW);
  85.     sysinfo_set_item_val("fb.height", NULL, ROWS);
  86.     sysinfo_set_item_val("fb.address.physical", NULL, VIDEORAM);
  87.    
  88. #ifndef CONFIG_FB
  89.     putchar('\n');
  90. #endif 
  91. }
  92.  
  93. static void ega_display_char(char ch)
  94. {
  95.     videoram[ega_cursor * 2] = ch;
  96. }
  97.  
  98. /*
  99.  * This function takes care of scrolling.
  100.  */
  101. static void ega_check_cursor(void)
  102. {
  103.     if (ega_cursor < SCREEN)
  104.         return;
  105.  
  106.     memcpy((void *) videoram, (void *) (videoram + ROW * 2), (SCREEN - ROW) * 2);
  107.     memsetw((uintptr_t) (videoram + (SCREEN - ROW) * 2), ROW, 0x0720);
  108.     ega_cursor = ega_cursor - ROW;
  109. }
  110.  
  111. void ega_putchar(chardev_t *d, const char ch)
  112. {
  113.     ipl_t ipl;
  114.  
  115.     ipl = interrupts_disable();
  116.     spinlock_lock(&egalock);
  117.  
  118.     switch (ch) {
  119.         case '\n':
  120.             ega_cursor = (ega_cursor + ROW) - ega_cursor % ROW;
  121.             break;
  122.         case '\t':
  123.             ega_cursor = (ega_cursor + 8) - ega_cursor % 8;
  124.             break;
  125.         case '\b':
  126.             if (ega_cursor % ROW)
  127.                 ega_cursor--;
  128.             break;
  129.         default:
  130.             ega_display_char(ch);
  131.             ega_cursor++;
  132.             break;
  133.     }
  134.     ega_check_cursor();
  135.     ega_move_cursor();
  136.  
  137.     spinlock_unlock(&egalock);
  138.     interrupts_restore(ipl);
  139. }
  140.  
  141. void ega_move_cursor(void)
  142. {
  143.     outb(0x3d4, 0xe);
  144.     outb(0x3d5, (ega_cursor >> 8) & 0xff);
  145.     outb(0x3d4, 0xf);
  146.     outb(0x3d5, ega_cursor & 0xff);
  147. }
  148.  
  149. /** @}
  150.  */
  151.