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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 xen32
  30.  * @{
  31.  */
  32. /**
  33.  * @file
  34.  * @brief Xen32 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. #include <mm/frame.h>
  43.  
  44. #define MASK_INDEX(index, ring) ((index) & (sizeof(ring) - 1))
  45.  
  46. typedef struct {
  47.     char in[1024];
  48.     char out[2048];
  49.     uint32_t in_cons;
  50.     uint32_t in_prod;
  51.     uint32_t out_cons;
  52.     uint32_t out_prod;
  53. } xencons_t;
  54.  
  55. static bool asynchronous = false;
  56. static void xen_putchar(chardev_t *d, const char ch);
  57.  
  58. chardev_t xen_console;
  59. static chardev_operations_t xen_ops = {
  60.     .write = xen_putchar
  61. };
  62.  
  63. void xen_console_init(void)
  64. {
  65.     chardev_initialize("xen_out", &xen_console, &xen_ops);
  66.     stdout = &xen_console;
  67.     if (!(start_info.flags & SIF_INITDOMAIN))
  68.         asynchronous = true;
  69. }
  70.  
  71. void xen_putchar(chardev_t *d, const char ch)
  72. {
  73.     if (asynchronous) {
  74.         xencons_t *console = (xencons_t *) PA2KA(MA2PA(PFN2ADDR(start_info.console_mfn)));
  75.         uint32_t cons = console->out_cons;
  76.         uint32_t prod = console->out_prod;
  77.        
  78.         memory_barrier();
  79.        
  80.         if ((prod - cons) > sizeof(console->out))
  81.             return;
  82.        
  83.         if (ch == '\n')
  84.             console->out[MASK_INDEX(prod++, console->out)] = '\r';
  85.         console->out[MASK_INDEX(prod++, console->out)] = ch;
  86.        
  87.         write_barrier();
  88.        
  89.         console->out_prod = prod;
  90.        
  91.         xen_notify_remote(start_info.console_evtchn);
  92.     } else
  93.         xen_console_io(CONSOLE_IO_WRITE, 1, &ch);
  94. }
  95.  
  96. /** @}
  97.  */
  98.