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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 genarch_drivers
  30.  * @{
  31.  */
  32. /**
  33.  * @file
  34.  * @brief EGA driver.
  35.  */
  36.  
  37. #include <genarch/drivers/ega/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. SPINLOCK_INITIALIZE(egalock);
  58. static uint32_t ega_cursor;
  59. static uint8_t *videoram;
  60. static uint8_t *backbuf;
  61. static ioport8_t *ega_base;
  62.  
  63. chardev_t ega_console;
  64.  
  65. /*
  66.  * This function takes care of scrolling.
  67.  */
  68. static void ega_check_cursor(void)
  69. {
  70.     if (ega_cursor < EGA_SCREEN)
  71.         return;
  72.  
  73.     memmove((void *) videoram, (void *) (videoram + EGA_COLS * 2),
  74.         (EGA_SCREEN - EGA_COLS) * 2);
  75.     memmove((void *) backbuf, (void *) (backbuf + EGA_COLS * 2),
  76.         (EGA_SCREEN - EGA_COLS) * 2);
  77.     memsetw(videoram + (EGA_SCREEN - EGA_COLS) * 2, EGA_COLS, 0x0720);
  78.     memsetw(backbuf + (EGA_SCREEN - EGA_COLS) * 2, EGA_COLS, 0x0720);
  79.     ega_cursor = ega_cursor - EGA_COLS;
  80. }
  81.  
  82. static void ega_show_cursor(void)
  83. {
  84.     pio_write_8(ega_base + EGA_INDEX_REG, 0x0a);
  85.     uint8_t stat = pio_read_8(ega_base + EGA_DATA_REG);
  86.     pio_write_8(ega_base + EGA_INDEX_REG, 0x0a);
  87.     pio_write_8(ega_base + EGA_DATA_REG, stat & (~(1 << 5)));
  88. }
  89.  
  90. static void ega_move_cursor(void)
  91. {
  92.     pio_write_8(ega_base + EGA_INDEX_REG, 0x0e);
  93.     pio_write_8(ega_base + EGA_DATA_REG, (uint8_t) ((ega_cursor >> 8) & 0xff));
  94.     pio_write_8(ega_base + EGA_INDEX_REG, 0x0f);
  95.     pio_write_8(ega_base + EGA_DATA_REG, (uint8_t) (ega_cursor & 0xff));
  96. }
  97.  
  98. static void ega_sync_cursor(void)
  99. {
  100.     pio_write_8(ega_base + EGA_INDEX_REG, 0x0e);
  101.     uint8_t hi = pio_read_8(ega_base + EGA_DATA_REG);
  102.     pio_write_8(ega_base + EGA_INDEX_REG, 0x0f);
  103.     uint8_t lo = pio_read_8(ega_base + EGA_DATA_REG);
  104.    
  105.     ega_cursor = (hi << 8) | lo;
  106.     if ((ega_cursor % EGA_COLS) != 0)
  107.         ega_cursor = (ega_cursor + EGA_COLS) - ega_cursor % EGA_COLS;
  108.    
  109.     ega_check_cursor();
  110.     ega_move_cursor();
  111.     ega_show_cursor();
  112. }
  113.  
  114. static void ega_display_char(char ch, bool silent)
  115. {
  116.     backbuf[ega_cursor * 2] = ch;
  117.    
  118.     if (!silent)
  119.         videoram[ega_cursor * 2] = ch;
  120. }
  121.  
  122. static void ega_putchar(chardev_t *d __attribute__((unused)), const char ch, bool silent)
  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 + EGA_COLS) - ega_cursor % EGA_COLS;
  132.         break;
  133.     case '\t':
  134.         ega_cursor = (ega_cursor + 8) - ega_cursor % 8;
  135.         break;
  136.     case '\b':
  137.         if (ega_cursor % EGA_COLS)
  138.             ega_cursor--;
  139.         break;
  140.     default:
  141.         ega_display_char(ch, silent);
  142.         ega_cursor++;
  143.         break;
  144.     }
  145.     ega_check_cursor();
  146.    
  147.     if (!silent)
  148.         ega_move_cursor();
  149.    
  150.     spinlock_unlock(&egalock);
  151.     interrupts_restore(ipl);
  152. }
  153.  
  154. static chardev_operations_t ega_ops = {
  155.     .write = ega_putchar
  156. };
  157.  
  158. void ega_init(ioport8_t *base, uintptr_t videoram_phys)
  159. {
  160.     /* Initialize the software structure. */
  161.     ega_base = base;
  162.    
  163.     backbuf = (uint8_t *) malloc(EGA_VRAM_SIZE, 0);
  164.     if (!backbuf)
  165.         panic("Unable to allocate backbuffer.");
  166.    
  167.     videoram = (uint8_t *) hw_map(videoram_phys, EGA_VRAM_SIZE);
  168.    
  169.     /* Synchronize the back buffer and cursor position. */
  170.     memcpy(backbuf, videoram, EGA_VRAM_SIZE);
  171.     ega_sync_cursor();
  172.    
  173.     chardev_initialize("ega_out", &ega_console, &ega_ops);
  174.     stdout = &ega_console;
  175.    
  176.     sysinfo_set_item_val("fb", NULL, true);
  177.     sysinfo_set_item_val("fb.kind", NULL, 2);
  178.     sysinfo_set_item_val("fb.width", NULL, EGA_COLS);
  179.     sysinfo_set_item_val("fb.height", NULL, EGA_ROWS);
  180.     sysinfo_set_item_val("fb.blinking", NULL, true);
  181.     sysinfo_set_item_val("fb.address.physical", NULL, videoram_phys);
  182. }
  183.  
  184. void ega_redraw(void)
  185. {
  186.     memcpy(videoram, backbuf, EGA_VRAM_SIZE);
  187.     ega_move_cursor();
  188.     ega_show_cursor();
  189. }
  190.  
  191. /** @}
  192.  */
  193.