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  1. /*
  2.  * Copyright (C) 2005 Martin Decky
  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/vga.h>
  30. #include <putchar.h>
  31. #include <mm/page.h>
  32. #include <synch/spinlock.h>
  33. #include <arch/types.h>
  34. #include <arch/asm.h>
  35.  
  36. static spinlock_t vgalock;
  37. static __u32 vga_cursor;
  38.  
  39. void vga_move_cursor(void);
  40.  
  41. void vga_init(void)
  42. {
  43. }
  44.  
  45. void vga_display_char(char ch)
  46. {
  47. //  __u8 *vram = (__u8 *) PA2KA(VIDEORAM);
  48.    
  49. //  vram[vga_cursor*2] = ch;
  50. }
  51.  
  52. /*
  53.  * This function takes care of scrolling.
  54.  */
  55. void vga_check_cursor(void)
  56. {
  57. }
  58.  
  59. void vga_putchar(const char ch)
  60. {
  61.     pri_t pri;
  62.  
  63.     pri = cpu_priority_high();
  64.     spinlock_lock(&vgalock);
  65.  
  66.     switch (ch) {
  67.         case '\n':
  68.         vga_cursor = (vga_cursor + ROW) - vga_cursor % ROW;
  69.         break;
  70.         case '\t':
  71.         vga_cursor = (vga_cursor + 8) - vga_cursor % 8;
  72.         break;
  73.         default:
  74.         vga_display_char(ch);
  75.         vga_cursor++;
  76.         break;
  77.         }
  78.     vga_check_cursor();
  79.     vga_move_cursor();
  80.  
  81.     spinlock_unlock(&vgalock);
  82.     cpu_priority_restore(pri);
  83. }
  84.  
  85. void vga_move_cursor(void)
  86. {
  87. }
  88.  
  89. void putchar(const char ch)
  90. {
  91.     vga_putchar(ch);
  92. }
  93.