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  1. /*
  2.  * Copyright (C) 2005 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. #include <arch/ski/ski.h>
  30. #include <console/console.h>
  31. #include <console/chardev.h>
  32.  
  33. static chardev_t ski_console;
  34. static bool kb_disable;
  35.  
  36. /** Display character on debug console
  37.  *
  38.  * Use SSC (Simulator System Call) to
  39.  * display character on debug console.
  40.  *
  41.  * @param ch   Character to be printed.
  42.  */
  43. void ski_write(chardev_t *d, const char ch)
  44. {
  45.     __asm__ (
  46.         "mov r15=%0\n"
  47.         "mov r32=%1\n"      /* r32 is in0 */
  48.         "break 0x80000\n"   /* modifies r8 */
  49.         :
  50.         : "i" (SKI_PUTCHAR), "r" (ch)
  51.         : "r15", "in0", "r8"
  52.     );
  53.    
  54.     if (ch == '\n') ski_putchar('\r');
  55. }
  56.  
  57. /** Ask debug console if a key was pressed.
  58.  *
  59.  * Use SSC (Simulator System Call) to
  60.  * get character from debug console.
  61.  *
  62.  * This call is non-blocking.
  63.  *
  64.  * @return ASCII code of pressed key or 0 if no key pressed.
  65.  */
  66. __s32 ski_getchar(void)
  67. {
  68.     __u64 ch;
  69.    
  70.     __asm__ (
  71.         "mov r15=%0\n"
  72.         "break 0x80000;;\n" /* modifies r8 */
  73.         "mov %1=r8;;\n"    
  74.  
  75.         :
  76.         : "i" (SKI_GETCHAR), "r" (ch)
  77.         : "r15",  "r8"
  78.     );
  79.  
  80.     return (__s32)ch;
  81. }
  82.  
  83. /** Ask keyboard if a key was pressed. */
  84. void poll_keyboard(void)
  85. {
  86.     char ch;
  87.  
  88.     if (kb_disable)
  89.         return;
  90.  
  91.     ch = ski_getchar();
  92.     if(ch == '\r')
  93.         ch = '\n';
  94.     if (ch)
  95.         chardev_push_character(&ski_console, ch);
  96. }
  97.  
  98. /* Called from getc(). */
  99. static void ski_kb_enable(chardev_t *)
  100. {
  101.     kb_disable = false;
  102. }
  103.  
  104. /* Called from getc(). */
  105. static void ski_kb_disable(chardev_t *d)
  106. {
  107.     kb_disable = true; 
  108. }
  109.  
  110.  
  111. static chardev_operations_t ski_ops = {
  112.     .resume = ski_kb_enable,
  113.     .suspend = ski_kb_disable,
  114.     .write = ski_write
  115. };
  116.  
  117.  
  118. /** Initialize debug console
  119.  *
  120.  * Issue SSC (Simulator System Call) to
  121.  * to open debug console.
  122.  */
  123. void ski_init_console(void)
  124. {
  125.     __asm__ (
  126.         "mov r15=%0\n"
  127.         "break 0x80000\n"
  128.         :
  129.         : "i" (SKI_INIT_CONSOLE)
  130.         : "r15", "r8"
  131.     );
  132.  
  133.     chardev_initialize("ski_console", &ski_console, &ski_ops);
  134.     stdin = &ski_console;
  135.     stdout = &ski_console;
  136. }
  137.