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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. #include <ddi/ddi.h>
  50.  
  51. /*
  52.  * The EGA driver.
  53.  * Simple and short. Function for displaying characters and "scrolling".
  54.  */
  55.  
  56. static parea_t ega_parea;   /**< Physical memory area for EGA video RAM. */
  57.  
  58. SPINLOCK_INITIALIZE(egalock);
  59. static uint32_t ega_cursor;
  60. static uint8_t *videoram;
  61.  
  62. static void ega_putchar(chardev_t *d, const char ch);
  63.  
  64. chardev_t ega_console;
  65. static chardev_operations_t ega_ops = {
  66.     .write = ega_putchar
  67. };
  68.  
  69. void ega_move_cursor(void);
  70.  
  71. void ega_init(void)
  72. {
  73.     uint8_t hi, lo;
  74.    
  75.     videoram = (uint8_t *) hw_map(VIDEORAM, SCREEN * 2);
  76.     outb(0x3d4, 0xe);
  77.     hi = inb(0x3d5);
  78.     outb(0x3d4, 0xf);
  79.     lo = inb(0x3d5);
  80.     ega_cursor = (hi << 8) | lo;
  81.  
  82.     chardev_initialize("ega_out", &ega_console, &ega_ops);
  83.     stdout = &ega_console;
  84.    
  85.     ega_parea.pbase = VIDEORAM;
  86.     ega_parea.vbase = (uintptr_t) videoram;
  87.     ega_parea.frames = 1;
  88.     ega_parea.cacheable = false;
  89.     ddi_parea_register(&ega_parea);
  90.  
  91.     sysinfo_set_item_val("fb", NULL, true);
  92.     sysinfo_set_item_val("fb.kind", NULL, 2);
  93.     sysinfo_set_item_val("fb.width", NULL, ROW);
  94.     sysinfo_set_item_val("fb.height", NULL, ROWS);
  95.     sysinfo_set_item_val("fb.address.physical", NULL, VIDEORAM);
  96.     sysinfo_set_item_val("fb.address.color", NULL, PAGE_COLOR((uintptr_t)
  97.         videoram));
  98.    
  99. #ifndef CONFIG_FB
  100.     putchar('\n');
  101. #endif 
  102. }
  103.  
  104. static void ega_display_char(char ch)
  105. {
  106.     videoram[ega_cursor * 2] = ch;
  107. }
  108.  
  109. /*
  110.  * This function takes care of scrolling.
  111.  */
  112. static void ega_check_cursor(void)
  113. {
  114.     if (ega_cursor < SCREEN)
  115.         return;
  116.  
  117.     memcpy((void *) videoram, (void *) (videoram + ROW * 2), (SCREEN - ROW) * 2);
  118.     memsetw((uintptr_t) (videoram + (SCREEN - ROW) * 2), ROW, 0x0720);
  119.     ega_cursor = ega_cursor - ROW;
  120. }
  121.  
  122. void ega_putchar(chardev_t *d, const char ch)
  123. {
  124.     ipl_t ipl;
  125.  
  126.     ipl = interrupts_disable();
  127.     spinlock_lock(&egalock);
  128.  
  129.     switch (ch) {
  130.         case '\n':
  131.             ega_cursor = (ega_cursor + ROW) - ega_cursor % ROW;
  132.             break;
  133.         case '\t':
  134.             ega_cursor = (ega_cursor + 8) - ega_cursor % 8;
  135.             break;
  136.         case '\b':
  137.             if (ega_cursor % ROW)
  138.                 ega_cursor--;
  139.             break;
  140.         default:
  141.             ega_display_char(ch);
  142.             ega_cursor++;
  143.             break;
  144.     }
  145.     ega_check_cursor();
  146.     ega_move_cursor();
  147.  
  148.     spinlock_unlock(&egalock);
  149.     interrupts_restore(ipl);
  150. }
  151.  
  152. void ega_move_cursor(void)
  153. {
  154.     outb(0x3d4, 0xe);
  155.     outb(0x3d5, (ega_cursor >> 8) & 0xff);
  156.     outb(0x3d4, 0xf);
  157.     outb(0x3d5, ega_cursor & 0xff);
  158. }
  159.  
  160. /** @}
  161.  */
  162.