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  1. /*
  2.  * Copyright (C) 2006 Martin Decky
  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 ia32xen
  30.  * @{
  31.  */
  32. /**
  33.  * @file
  34.  * @brief ia32xen console driver.
  35.  */
  36.  
  37. #include <arch/drivers/xconsole.h>
  38. #include <putchar.h>
  39. #include <console/chardev.h>
  40. #include <console/console.h>
  41. #include <arch/hypercall.h>
  42.  
  43. #define MASK_INDEX(index, ring) ((index) & (sizeof(ring) - 1))
  44.  
  45. static void xen_putchar(chardev_t *d, const char ch);
  46.  
  47. chardev_t xen_console;
  48. static chardev_operations_t xen_ops = {
  49.     .write = xen_putchar
  50. };
  51.  
  52. void xen_console_init(void)
  53. {
  54.     chardev_initialize("xen_out", &xen_console, &xen_ops);
  55.     stdout = &xen_console;
  56. }
  57.  
  58. void xen_putchar(chardev_t *d, const char ch)
  59. {
  60.     if (start_info.console.domU.evtchn != 0) {
  61.         uint32_t cons = console_page.out_cons;
  62.         uint32_t prod = console_page.out_prod;
  63.        
  64.         memory_barrier();
  65.        
  66.         if ((prod - cons) > sizeof(console_page.out))
  67.             return;
  68.        
  69.         if (ch == '\n')
  70.             console_page.out[MASK_INDEX(prod++, console_page.out)] = '\r';
  71.         console_page.out[MASK_INDEX(prod++, console_page.out)] = ch;
  72.        
  73.         write_barrier();
  74.        
  75.         console_page.out_prod = prod;
  76.        
  77.         xen_notify_remote(start_info.console.domU.evtchn);
  78.     } else
  79.         xen_console_io(CONSOLE_IO_WRITE, 1, &ch);
  80. }
  81.  
  82. /** @}
  83.  */
  84.