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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/drivers/ega.h>
  30. #include <putchar.h>
  31. #include <mm/page.h>
  32. #include <mm/as.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. #include <sysinfo/sysinfo.h>
  41.  
  42. /*
  43.  * The EGA driver.
  44.  * Simple and short. Function for displaying characters and "scrolling".
  45.  */
  46.  
  47. SPINLOCK_INITIALIZE(egalock);
  48. static __u32 ega_cursor;
  49. static __u8 *videoram;
  50.  
  51. static void ega_putchar(chardev_t *d, const char ch);
  52.  
  53. chardev_t ega_console;
  54. static chardev_operations_t ega_ops = {
  55.     .write = ega_putchar
  56. };
  57.  
  58. void ega_move_cursor(void);
  59.  
  60. void ega_init(void)
  61. {
  62.     __u8 hi, lo;
  63.    
  64.     videoram = (__u8 *) hw_map(VIDEORAM, SCREEN * 2);
  65.     outb(0x3d4, 0xe);
  66.     hi = inb(0x3d5);
  67.     outb(0x3d4, 0xf);
  68.     lo = inb(0x3d5);
  69.     ega_cursor = (hi << 8) | lo;
  70.  
  71.     chardev_initialize("ega_out", &ega_console, &ega_ops);
  72.     stdout = &ega_console;
  73.    
  74.     sysinfo_set_item_val("fb", NULL, true);
  75.     sysinfo_set_item_val("fb.kind", NULL, 2);
  76.     sysinfo_set_item_val("fb.width", NULL, ROW);
  77.     sysinfo_set_item_val("fb.height", NULL, ROWS);
  78.     sysinfo_set_item_val("fb.address.physical", NULL, VIDEORAM);
  79.    
  80. #ifndef CONFIG_FB
  81.     putchar('\n');
  82. #endif 
  83. }
  84.  
  85. static void ega_display_char(char ch)
  86. {
  87.     videoram[ega_cursor * 2] = ch;
  88. }
  89.  
  90. /*
  91.  * This function takes care of scrolling.
  92.  */
  93. static void ega_check_cursor(void)
  94. {
  95.     if (ega_cursor < SCREEN)
  96.         return;
  97.  
  98.     memcpy((void *) videoram, (void *) (videoram + ROW * 2), (SCREEN - ROW) * 2);
  99.     memsetw((__address) (videoram + (SCREEN - ROW) * 2), ROW, 0x0720);
  100.     ega_cursor = ega_cursor - ROW;
  101. }
  102.  
  103. void ega_putchar(chardev_t *d, const char ch)
  104. {
  105.     ipl_t ipl;
  106.  
  107.     ipl = interrupts_disable();
  108.     spinlock_lock(&egalock);
  109.  
  110.     switch (ch) {
  111.         case '\n':
  112.             ega_cursor = (ega_cursor + ROW) - ega_cursor % ROW;
  113.             break;
  114.         case '\t':
  115.             ega_cursor = (ega_cursor + 8) - ega_cursor % 8;
  116.             break;
  117.         case '\b':
  118.             if (ega_cursor % ROW)
  119.                 ega_cursor--;
  120.             break;
  121.         default:
  122.             ega_display_char(ch);
  123.             ega_cursor++;
  124.             break;
  125.     }
  126.     ega_check_cursor();
  127.     ega_move_cursor();
  128.  
  129.     spinlock_unlock(&egalock);
  130.     interrupts_restore(ipl);
  131. }
  132.  
  133. void ega_move_cursor(void)
  134. {
  135.     outb(0x3d4, 0xe);
  136.     outb(0x3d5, (ega_cursor >> 8) & 0xff);
  137.     outb(0x3d4, 0xf);
  138.     outb(0x3d5, ega_cursor & 0xff);
  139. }
  140.