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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. static void ski_putchar(chardev_t *d, const char ch);
  37. static __s32 ski_getchar(void);
  38.  
  39. /** Display character on debug console
  40.  *
  41.  * Use SSC (Simulator System Call) to
  42.  * display character on debug console.
  43.  *
  44.  * @param d Character device.
  45.  * @param ch Character to be printed.
  46.  */
  47. void ski_putchar(chardev_t *d, const char ch)
  48. {
  49.     __asm__ volatile (
  50.         "mov r15=%0\n"
  51.         "mov r32=%1\n"      /* r32 is in0 */
  52.         "break 0x80000\n"   /* modifies r8 */
  53.         :
  54.         : "i" (SKI_PUTCHAR), "r" (ch)
  55.         : "r15", "in0", "r8"
  56.     );
  57.    
  58.     if (ch == '\n')
  59.         ski_putchar(d, '\r');
  60. }
  61.  
  62. /** Ask debug console if a key was pressed.
  63.  *
  64.  * Use SSC (Simulator System Call) to
  65.  * get character from debug console.
  66.  *
  67.  * This call is non-blocking.
  68.  *
  69.  * @return ASCII code of pressed key or 0 if no key pressed.
  70.  */
  71. __s32 ski_getchar(void)
  72. {
  73.     __u64 ch;
  74.    
  75.     __asm__ volatile (
  76.         "mov r15=%1\n"
  77.         "break 0x80000;;\n" /* modifies r8 */
  78.         "mov %0=r8;;\n"    
  79.  
  80.         : "=r" (ch)
  81.         : "i" (SKI_GETCHAR)
  82.         : "r15",  "r8"
  83.     );
  84.  
  85.     return (__s32) ch;
  86. }
  87.  
  88. /**
  89.  * This is a blocking wrapper for ski_getchar().
  90.  * To be used when the kernel crashes.
  91.  */
  92. static char ski_getchar_blocking(chardev_t *d)
  93. {
  94.     int ch;
  95.  
  96.     while(!(ch=ski_getchar()))
  97.         ;
  98.     if(ch == '\r')
  99.         ch = '\n';
  100.     return (char) ch;
  101. }
  102.  
  103. /** Ask keyboard if a key was pressed. */
  104. void poll_keyboard(void)
  105. {
  106.     char ch;
  107.  
  108.     if (kb_disable)
  109.         return;
  110.  
  111.     ch = ski_getchar();
  112.     if(ch == '\r')
  113.         ch = '\n';
  114.     if (ch)
  115.         chardev_push_character(&ski_console, ch);
  116. }
  117.  
  118. /* Called from getc(). */
  119. static void ski_kb_enable(chardev_t *d)
  120. {
  121.     kb_disable = false;
  122. }
  123.  
  124. /* Called from getc(). */
  125. static void ski_kb_disable(chardev_t *d)
  126. {
  127.     kb_disable = true; 
  128. }
  129.  
  130.  
  131. static chardev_operations_t ski_ops = {
  132.     .resume = ski_kb_enable,
  133.     .suspend = ski_kb_disable,
  134.     .write = ski_putchar,
  135.     .read = ski_getchar_blocking
  136. };
  137.  
  138.  
  139. /** Initialize debug console
  140.  *
  141.  * Issue SSC (Simulator System Call) to
  142.  * to open debug console.
  143.  */
  144. void ski_init_console(void)
  145. {
  146.     __asm__ volatile (
  147.         "mov r15=%0\n"
  148.         "break 0x80000\n"
  149.         :
  150.         : "i" (SKI_INIT_CONSOLE)
  151.         : "r15", "r8"
  152.     );
  153.  
  154.     chardev_initialize("ski_console", &ski_console, &ski_ops);
  155.     stdin = &ski_console;
  156.     stdout = &ski_console;
  157. }
  158.