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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. /** @file
  33.  */
  34.  
  35. #include <arch/drivers/ega.h>
  36. #include <putchar.h>
  37. #include <mm/page.h>
  38. #include <mm/as.h>
  39. #include <arch/mm/page.h>
  40. #include <synch/spinlock.h>
  41. #include <arch/types.h>
  42. #include <arch/asm.h>
  43. #include <memstr.h>
  44. #include <console/chardev.h>
  45. #include <console/console.h>
  46. #include <sysinfo/sysinfo.h>
  47.  
  48. /*
  49.  * The EGA driver.
  50.  * Simple and short. Function for displaying characters and "scrolling".
  51.  */
  52.  
  53. SPINLOCK_INITIALIZE(egalock);
  54. static __u32 ega_cursor;
  55. static __u8 *videoram;
  56.  
  57. static void ega_putchar(chardev_t *d, const char ch);
  58.  
  59. chardev_t ega_console;
  60. static chardev_operations_t ega_ops = {
  61.     .write = ega_putchar
  62. };
  63.  
  64. void ega_move_cursor(void);
  65.  
  66. void ega_init(void)
  67. {
  68.     __u8 hi, lo;
  69.    
  70.     videoram = (__u8 *) hw_map(VIDEORAM, SCREEN * 2);
  71.     outb(0x3d4, 0xe);
  72.     hi = inb(0x3d5);
  73.     outb(0x3d4, 0xf);
  74.     lo = inb(0x3d5);
  75.     ega_cursor = (hi << 8) | lo;
  76.  
  77.     chardev_initialize("ega_out", &ega_console, &ega_ops);
  78.     stdout = &ega_console;
  79.    
  80.     sysinfo_set_item_val("fb", NULL, true);
  81.     sysinfo_set_item_val("fb.kind", NULL, 2);
  82.     sysinfo_set_item_val("fb.width", NULL, ROW);
  83.     sysinfo_set_item_val("fb.height", NULL, ROWS);
  84.     sysinfo_set_item_val("fb.address.physical", NULL, VIDEORAM);
  85.    
  86. #ifndef CONFIG_FB
  87.     putchar('\n');
  88. #endif 
  89. }
  90.  
  91. static void ega_display_char(char ch)
  92. {
  93.     videoram[ega_cursor * 2] = ch;
  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((__address) (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.     ega_move_cursor();
  134.  
  135.     spinlock_unlock(&egalock);
  136.     interrupts_restore(ipl);
  137. }
  138.  
  139. void ega_move_cursor(void)
  140. {
  141.     outb(0x3d4, 0xe);
  142.     outb(0x3d5, (ega_cursor >> 8) & 0xff);
  143.     outb(0x3d4, 0xf);
  144.     outb(0x3d5, ega_cursor & 0xff);
  145. }
  146.  
  147.  /** @}
  148.  */
  149.  
  150.