arch/all-pc/boot/grub2-aros/grub-core/term/xen/console.c

   1 /*
   2  *  GRUB  --  GRand Unified Bootloader
   3  *  Copyright (C) 2011  Free Software Foundation, Inc.
   4  *
   5  *  GRUB is free software: you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation, either version 3 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  GRUB is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <grub/term.h>
  20 #include <grub/types.h>
  21 #include <grub/misc.h>
  22 #include <grub/mm.h>
  23 #include <grub/time.h>
  24 #include <grub/terminfo.h>
  25 #include <grub/xen.h>
  26
  27 static int
  28 readkey (struct grub_term_input *term __attribute__ ((unused)))
  29 {
  30   grub_size_t prod, cons;
  31   int r;
  32   mb ();
  33   prod = grub_xen_xcons->in_prod;
  34   cons = grub_xen_xcons->in_cons;
  35   if (prod <= cons)
  36     return -1;
  37   r = grub_xen_xcons->in[cons];
  38   cons++;
  39   mb ();
  40   grub_xen_xcons->in_cons = cons;
  41   return r;
  42 }
  43
  44 static int signal_sent = 1;
  45
  46 static void
  47 refresh (struct grub_term_output *term __attribute__ ((unused)))
  48 {
  49   struct evtchn_send send;
  50   send.port = grub_xen_start_page_addr->console.domU.evtchn;
  51   grub_xen_event_channel_op (EVTCHNOP_send, &send);
  52   signal_sent = 1;
  53   while (grub_xen_xcons->out_prod != grub_xen_xcons->out_cons)
  54     {
  55       grub_xen_sched_op (SCHEDOP_yield, 0);
  56     }
  57 }
  58
  59 static void
  60 put (struct grub_term_output *term __attribute__ ((unused)), const int c)
  61 {
  62   grub_size_t prod, cons;
  63
  64   while (1)
  65     {
  66       mb ();
  67       prod = grub_xen_xcons->out_prod;
  68       cons = grub_xen_xcons->out_cons;
  69       if (prod < cons + sizeof (grub_xen_xcons->out))
  70         break;
  71       if (!signal_sent)
  72         refresh (term);
  73       grub_xen_sched_op (SCHEDOP_yield, 0);
  74     }
  75   grub_xen_xcons->out[prod++ & (sizeof (grub_xen_xcons->out) - 1)] = c;
  76   mb ();
  77   grub_xen_xcons->out_prod = prod;
  78   signal_sent = 0;
  79 }
  80
  81
  82 struct grub_terminfo_input_state grub_console_terminfo_input = {
  83   .readkey = readkey
  84 };
  85
  86 struct grub_terminfo_output_state grub_console_terminfo_output = {
  87   .put = put,
  88   .size = {80, 24}
  89 };
  90
  91 static struct grub_term_input grub_console_term_input = {
  92   .name = "console",
  93   .init = 0,
  94   .getkey = grub_terminfo_getkey,
  95   .data = &grub_console_terminfo_input
  96 };
  97
  98 static struct grub_term_output grub_console_term_output = {
  99   .name = "console",
 100   .init = 0,
 101   .putchar = grub_terminfo_putchar,
 102   .getxy = grub_terminfo_getxy,
 103   .getwh = grub_terminfo_getwh,
 104   .gotoxy = grub_terminfo_gotoxy,
 105   .cls = grub_terminfo_cls,
 106   .refresh = refresh,
 107   .setcolorstate = grub_terminfo_setcolorstate,
 108   .setcursor = grub_terminfo_setcursor,
 109   .flags = GRUB_TERM_CODE_TYPE_ASCII,
 110   .data = &grub_console_terminfo_output,
 111 };
 112
 113
 114 void
 115 grub_console_init (void)
 116 {
 117   grub_term_register_input ("console", &grub_console_term_input);
 118   grub_term_register_output ("console", &grub_console_term_output);
 119
 120   grub_terminfo_init ();
 121   grub_terminfo_output_register (&grub_console_term_output, "vt100-color");
 122 }