grub-core/term/i386/coreboot/cbmemc.c

   1 /*
   2  *  GRUB  --  GRand Unified Bootloader
   3  *  Copyright (C) 2013  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/dl.h>
  26 #include <grub/i386/coreboot/lbio.h>
  27 #include <grub/command.h>
  28 #include <grub/normal.h>
  29
  30 GRUB_MOD_LICENSE ("GPLv3+");
  31
  32 struct grub_linuxbios_cbmemc
  33 {
  34   grub_uint32_t size;
  35   grub_uint32_t pointer;
  36   char data[0];
  37 };
  38
  39 static struct grub_linuxbios_cbmemc *cbmemc;
  40
  41 static void
  42 put (struct grub_term_output *term __attribute__ ((unused)), const int c)
  43 {
  44   if (!cbmemc)
  45     return;
  46   if (cbmemc->pointer < cbmemc->size)
  47     cbmemc->data[cbmemc->pointer] = c;
  48   cbmemc->pointer++;
  49 }
  50
  51 struct grub_terminfo_output_state grub_cbmemc_terminfo_output =
  52   {
  53     .put = put,
  54     .size = { 80, 24 }
  55   };
  56
  57 static struct grub_term_output grub_cbmemc_term_output =
  58   {
  59     .name = "cbmemc",
  60     .init = grub_terminfo_output_init,
  61     .fini = 0,
  62     .putchar = grub_terminfo_putchar,
  63     .getxy = grub_terminfo_getxy,
  64     .getwh = grub_terminfo_getwh,
  65     .gotoxy = grub_terminfo_gotoxy,
  66     .cls = grub_terminfo_cls,
  67     .setcolorstate = grub_terminfo_setcolorstate,
  68     .setcursor = grub_terminfo_setcursor,
  69     .flags = GRUB_TERM_CODE_TYPE_ASCII,
  70     .data = &grub_cbmemc_terminfo_output,
  71   };
  72
  73 static int
  74 iterate_linuxbios_table (grub_linuxbios_table_item_t table_item,
  75                          void *data __attribute__ ((unused)))
  76 {
  77   if (table_item->tag != GRUB_LINUXBIOS_MEMBER_CBMEMC)
  78     return 0;
  79   cbmemc = (struct grub_linuxbios_cbmemc *) (grub_addr_t)
  80     *(grub_uint64_t *) (table_item + 1);
  81   return 1;
  82 }
  83
  84 static grub_err_t
  85 grub_cmd_cbmemc (struct grub_command *cmd __attribute__ ((unused)),
  86                  int argc __attribute__ ((unused)),
  87                  char *argv[] __attribute__ ((unused)))
  88 {
  89   grub_size_t len;
  90   char *str;
  91   struct grub_linuxbios_cbmemc *cbmemc_saved;
  92
  93   if (!cbmemc)
  94     return grub_error (GRUB_ERR_IO, "no CBMEM console found");
  95
  96   len = cbmemc->pointer;
  97   if (len > cbmemc->size)
  98     len = cbmemc->size;
  99   str = cbmemc->data;
 100   cbmemc_saved = cbmemc;
 101   cbmemc = 0;
 102   grub_xnputs (str, len);
 103   cbmemc = cbmemc_saved;
 104   return 0;
 105 }
 106
 107 static grub_command_t cmd;
 108
 109 GRUB_MOD_INIT (cbmemc)
 110 {
 111   grub_linuxbios_table_iterate (iterate_linuxbios_table, 0);
 112
 113   if (cbmemc)
 114     grub_term_register_output ("cbmemc", &grub_cbmemc_term_output);
 115
 116   cmd =
 117     grub_register_command ("cbmemc", grub_cmd_cbmemc,
 118                            0, N_("Show CBMEM console content."));
 119 }
 120
 121
 122 GRUB_MOD_FINI (cbmemc)
 123 {
 124   grub_term_unregister_output (&grub_cbmemc_term_output);
 125   grub_unregister_command (cmd);
 126 }