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  1. /*
  2.  * Copyright (c) 2008 Pavel Rimsky
  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 sparc64
  30.  * @{
  31.  */
  32. /**
  33.  * @file
  34.  * @brief   Niagara input/output driver based on hypervisor calls.
  35.  */
  36.  
  37. #include <arch/drivers/niagara.h>
  38. #include <console/chardev.h>
  39. #include <console/console.h>
  40. #include <arch/drivers/kbd.h>
  41. #include <arch/sun4v/hypercall.h>
  42.  
  43. /* functions referenced from definitions of I/O operations structures */
  44. static void niagara_putchar(chardev_t *, const char);
  45. static void niagara_noop(chardev_t *);
  46. static char niagara_read(chardev_t *);
  47.  
  48. /** character device operations */
  49. static chardev_operations_t niagara_ops = {
  50.     .write = niagara_putchar,
  51.     .suspend = niagara_noop,
  52.     .resume = niagara_noop,
  53.     .read = niagara_read
  54. };
  55.  
  56. /** Niagara character device */
  57. chardev_t niagara_io;
  58.  
  59. /** defined in drivers/kbd.c */
  60. extern kbd_type_t kbd_type;
  61.  
  62. /** Writes a single character to the standard output. */
  63. static inline void do_putchar(const char c) {
  64.     /* repeat until the buffer is non-full */
  65.     while (__hypercall_fast1(CONS_PUTCHAR, c) == EWOULDBLOCK)
  66.         ;
  67. }
  68.  
  69. /** Writes a single character to the standard output. */
  70. static void niagara_putchar(struct chardev * cd, const char c)
  71. {
  72.     do_putchar(c);
  73.     if (c == '\n')
  74.         do_putchar('\r');
  75. }
  76.  
  77. /**
  78.  * Grabs the input for kernel.
  79.  */
  80. void niagara_grab(void)
  81. {
  82. }
  83.  
  84. /**
  85.  * Releases the input so that userspace can use it.
  86.  */
  87. void niagara_release(void)
  88. {
  89. }
  90.  
  91. /**
  92.  * Default suspend/resume operation for the input device.
  93.  */
  94. static void niagara_noop(chardev_t *d)
  95. {
  96. }
  97.  
  98. /**
  99.  * Called when actively reading the character. Not implemented yet.
  100.  */
  101. static char niagara_read(chardev_t *d)
  102. {
  103.     return (char) 0;
  104. }
  105.  
  106. /**
  107.  * Function regularly called by the keyboard polling thread. Asks the
  108.  * hypervisor whether there is any unread character. If so, it picks it up
  109.  * and sends it to the upper layers of HelenOS.
  110.  */
  111. void niagara_poll(void)
  112. {
  113.     uint64_t c = 50;
  114.  
  115.     if (__hypercall_fast_ret1(0, 0, 0, 0, 0, CONS_GETCHAR, &c) == EOK) {
  116.         chardev_push_character(&niagara_io, c);
  117.         if (c == '\r')
  118.             chardev_push_character(&niagara_io, '\n');
  119.     }
  120.  
  121. }
  122.  
  123. /**
  124.  * Initializes the input/output subsystem so that the Niagara standard
  125.  * input/output is used.
  126.  */
  127. void niagara_init(void)
  128. {
  129.     kbd_type = KBD_SUN4V;
  130.  
  131.     chardev_initialize("niagara_io", &niagara_io, &niagara_ops);
  132.     stdin = &niagara_io;
  133.     stdout = &niagara_io;
  134. }
  135.  
  136. /** @}
  137.  */
  138.