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/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2013 Free Software Foundation, Inc.
*
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/term.h>
#include <grub/types.h>
#include <grub/misc.h>
#include <grub/mm.h>
#include <grub/time.h>
#include <grub/terminfo.h>
#include <grub/dl.h>
#include <grub/coreboot/lbio.h>
#include <grub/command.h>
#include <grub/normal.h>
GRUB_MOD_LICENSE ("GPLv3+");
#define CURSOR_MASK ((1 << 28) - 1)
#define OVERFLOW (1 << 31)
struct grub_linuxbios_cbmemc
{
grub_uint32_t size;
grub_uint32_t cursor;
char body[0];
};
static struct grub_linuxbios_cbmemc *cbmemc;
static void
put (struct grub_term_output *term __attribute__ ((unused)), const int c)
{
grub_uint32_t flags, cursor;
if (!cbmemc)
return;
flags = cbmemc->cursor & ~CURSOR_MASK;
cursor = cbmemc->cursor & CURSOR_MASK;
if (cursor >= cbmemc->size)
return;
cbmemc->body[cursor++] = c;
if (cursor >= cbmemc->size)
{
cursor = 0;
flags |= OVERFLOW;
}
cbmemc->cursor = flags | cursor;
}
struct grub_terminfo_output_state grub_cbmemc_terminfo_output =
{
.put = put,
.size = { 80, 24 }
};
static struct grub_term_output grub_cbmemc_term_output =
{
.name = "cbmemc",
.init = grub_terminfo_output_init,
.fini = 0,
.putchar = grub_terminfo_putchar,
.getxy = grub_terminfo_getxy,
.getwh = grub_terminfo_getwh,
.gotoxy = grub_terminfo_gotoxy,
.cls = grub_terminfo_cls,
.setcolorstate = grub_terminfo_setcolorstate,
.setcursor = grub_terminfo_setcursor,
.flags = GRUB_TERM_CODE_TYPE_ASCII,
.data = &grub_cbmemc_terminfo_output,
.progress_update_divisor = GRUB_PROGRESS_NO_UPDATE
};
static int
iterate_linuxbios_table (grub_linuxbios_table_item_t table_item,
void *data __attribute__ ((unused)))
{
if (table_item->tag != GRUB_LINUXBIOS_MEMBER_CBMEMC)
return 0;
cbmemc = (struct grub_linuxbios_cbmemc *) (grub_addr_t)
*(grub_uint64_t *) (table_item + 1);
return 1;
}
static grub_err_t
grub_cmd_cbmemc (struct grub_command *cmd __attribute__ ((unused)),
int argc __attribute__ ((unused)),
char *argv[] __attribute__ ((unused)))
{
grub_size_t size, cursor;
struct grub_linuxbios_cbmemc *real_cbmemc;
if (!cbmemc)
return grub_error (GRUB_ERR_IO, "no CBMEM console found");
real_cbmemc = cbmemc;
cbmemc = 0;
cursor = real_cbmemc->cursor & CURSOR_MASK;
if (!(real_cbmemc->cursor & OVERFLOW) && cursor < real_cbmemc->size)
size = cursor;
else
size = real_cbmemc->size;
if (real_cbmemc->cursor & OVERFLOW)
{
if (cursor > size)
cursor = 0;
grub_xnputs(real_cbmemc->body + cursor, size - cursor);
grub_xnputs(real_cbmemc->body, cursor);
}
else
grub_xnputs(real_cbmemc->body, size);
cbmemc = real_cbmemc;
return 0;
}
static grub_command_t cmd;
GRUB_MOD_INIT (cbmemc)
{
grub_linuxbios_table_iterate (iterate_linuxbios_table, 0);
if (cbmemc)
grub_term_register_output ("cbmemc", &grub_cbmemc_term_output);
cmd =
grub_register_command ("cbmemc", grub_cmd_cbmemc,
0, N_("Show CBMEM console content."));
}
GRUB_MOD_FINI (cbmemc)
{
grub_term_unregister_output (&grub_cbmemc_term_output);
grub_unregister_command (cmd);
}
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