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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 <mm/slab.h>
  42. #include <arch/mm/page.h>
  43. #include <synch/spinlock.h>
  44. #include <arch/types.h>
  45. #include <arch/asm.h>
  46. #include <memstr.h>
  47. #include <console/chardev.h>
  48. #include <console/console.h>
  49. #include <sysinfo/sysinfo.h>
  50. #include <ddi/ddi.h>
  51.  
  52. /*
  53.  * The EGA driver.
  54.  * Simple and short. Function for displaying characters and "scrolling".
  55.  */
  56.  
  57. static parea_t ega_parea;   /**< Physical memory area for EGA video RAM. */
  58.  
  59. SPINLOCK_INITIALIZE(egalock);
  60. static uint32_t ega_cursor;
  61. static uint8_t *videoram;
  62. static uint8_t *backbuf;
  63.  
  64. static void ega_putchar(chardev_t *d, const char ch);
  65.  
  66. chardev_t ega_console;
  67. static chardev_operations_t ega_ops = {
  68.     .write = ega_putchar
  69. };
  70.  
  71. static void ega_move_cursor(void);
  72.  
  73. void ega_init(void)
  74. {
  75.     uint8_t hi, lo;
  76.  
  77.     backbuf = (uint8_t *) malloc(SCREEN * 2, 0);
  78.     if (!backbuf)
  79.         panic("Unable to allocate backbuffer.\n");
  80.    
  81.     videoram = (uint8_t *) hw_map(VIDEORAM, SCREEN * 2);
  82.     outb(0x3d4, 0xe);
  83.     hi = inb(0x3d5);
  84.     outb(0x3d4, 0xf);
  85.     lo = inb(0x3d5);
  86.     ega_cursor = (hi << 8) | lo;
  87.  
  88.     chardev_initialize("ega_out", &ega_console, &ega_ops);
  89.     stdout = &ega_console;
  90.    
  91.     ega_parea.pbase = VIDEORAM;
  92.     ega_parea.vbase = (uintptr_t) videoram;
  93.     ega_parea.frames = 1;
  94.     ega_parea.cacheable = false;
  95.     ddi_parea_register(&ega_parea);
  96.  
  97.     sysinfo_set_item_val("fb", NULL, true);
  98.     sysinfo_set_item_val("fb.kind", NULL, 2);
  99.     sysinfo_set_item_val("fb.width", NULL, ROW);
  100.     sysinfo_set_item_val("fb.height", NULL, ROWS);
  101.     sysinfo_set_item_val("fb.address.physical", NULL, VIDEORAM);
  102. }
  103.  
  104. static void ega_display_char(char ch)
  105. {
  106.     videoram[ega_cursor * 2] = ch;
  107.     backbuf[ega_cursor * 2] = ch;
  108. }
  109.  
  110. /*
  111.  * This function takes care of scrolling.
  112.  */
  113. static void ega_check_cursor(void)
  114. {
  115.     if (ega_cursor < SCREEN)
  116.         return;
  117.  
  118.     memmove((void *) videoram, (void *) (videoram + ROW * 2), (SCREEN - ROW) * 2);
  119.     memmove((void *) backbuf, (void *) (backbuf + ROW * 2), (SCREEN - ROW) * 2);
  120.     memsetw(videoram + (SCREEN - ROW) * 2, ROW, 0x0720);
  121.     memsetw(backbuf + (SCREEN - ROW) * 2, ROW, 0x0720);
  122.     ega_cursor = ega_cursor - ROW;
  123. }
  124.  
  125. void ega_putchar(chardev_t *d __attribute__((unused)), const char ch)
  126. {
  127.     ipl_t ipl;
  128.  
  129.     ipl = interrupts_disable();
  130.     spinlock_lock(&egalock);
  131.  
  132.     switch (ch) {
  133.     case '\n':
  134.         ega_cursor = (ega_cursor + ROW) - ega_cursor % ROW;
  135.         break;
  136.     case '\t':
  137.         ega_cursor = (ega_cursor + 8) - ega_cursor % 8;
  138.         break;
  139.     case '\b':
  140.         if (ega_cursor % ROW)
  141.             ega_cursor--;
  142.         break;
  143.     default:
  144.         ega_display_char(ch);
  145.         ega_cursor++;
  146.         break;
  147.     }
  148.     ega_check_cursor();
  149.     ega_move_cursor();
  150.  
  151.     spinlock_unlock(&egalock);
  152.     interrupts_restore(ipl);
  153. }
  154.  
  155. void ega_move_cursor(void)
  156. {
  157.     outb(0x3d4, 0xe);
  158.     outb(0x3d5, (uint8_t) ((ega_cursor >> 8) & 0xff));
  159.     outb(0x3d4, 0xf);
  160.     outb(0x3d5, (uint8_t) (ega_cursor & 0xff));
  161. }
  162.  
  163. void ega_redraw(void)
  164. {
  165.     memcpy(videoram, backbuf, SCREEN * 2);
  166.     ega_move_cursor();
  167. }
  168.  
  169. /** @}
  170.  */
  171.