52e039e00b
The CMOS actually exists on most EFI platforms and in some cases is used to store useful data that makes it justifiable for GRUB to read/write it. As for date and time keep using EFI API and not CMOS one. Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
125 lines
3.1 KiB
C
125 lines
3.1 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2009 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/dl.h>
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#include <grub/command.h>
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#include <grub/misc.h>
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#include <grub/cmos.h>
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#include <grub/i18n.h>
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GRUB_MOD_LICENSE ("GPLv3+");
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static grub_err_t
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parse_args (int argc, char *argv[], int *byte, int *bit)
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{
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const char *rest;
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if (argc != 1)
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return grub_error (GRUB_ERR_BAD_ARGUMENT, "address required");
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*byte = grub_strtoul (argv[0], &rest, 0);
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if (*rest != ':')
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return grub_error (GRUB_ERR_BAD_ARGUMENT, "address required");
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*bit = grub_strtoul (rest + 1, 0, 0);
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return GRUB_ERR_NONE;
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}
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static grub_err_t
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grub_cmd_cmostest (struct grub_command *cmd __attribute__ ((unused)),
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int argc, char *argv[])
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{
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int byte = 0, bit = 0;
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grub_err_t err;
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grub_uint8_t value;
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err = parse_args (argc, argv, &byte, &bit);
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if (err)
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return err;
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err = grub_cmos_read (byte, &value);
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if (err)
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return err;
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if (value & (1 << bit))
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return GRUB_ERR_NONE;
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return grub_error (GRUB_ERR_TEST_FAILURE, N_("false"));
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}
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static grub_err_t
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grub_cmd_cmosclean (struct grub_command *cmd __attribute__ ((unused)),
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int argc, char *argv[])
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{
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int byte = 0, bit = 0;
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grub_err_t err;
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grub_uint8_t value;
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err = parse_args (argc, argv, &byte, &bit);
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if (err)
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return err;
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err = grub_cmos_read (byte, &value);
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if (err)
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return err;
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return grub_cmos_write (byte, value & (~(1 << bit)));
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}
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static grub_err_t
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grub_cmd_cmosset (struct grub_command *cmd __attribute__ ((unused)),
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int argc, char *argv[])
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{
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int byte = 0, bit = 0;
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grub_err_t err;
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grub_uint8_t value;
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err = parse_args (argc, argv, &byte, &bit);
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if (err)
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return err;
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err = grub_cmos_read (byte, &value);
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if (err)
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return err;
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return grub_cmos_write (byte, value | (1 << bit));
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}
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static grub_command_t cmd, cmd_clean, cmd_set;
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GRUB_MOD_INIT(cmostest)
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{
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cmd = grub_register_command_lockdown ("cmostest", grub_cmd_cmostest,
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N_("BYTE:BIT"),
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N_("Test bit at BYTE:BIT in CMOS."));
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cmd_clean = grub_register_command_lockdown ("cmosclean", grub_cmd_cmosclean,
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N_("BYTE:BIT"),
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N_("Clear bit at BYTE:BIT in CMOS."));
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cmd_set = grub_register_command_lockdown ("cmosset", grub_cmd_cmosset,
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N_("BYTE:BIT"),
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/* TRANSLATORS: A bit may be either set (1) or clear (0). */
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N_("Set bit at BYTE:BIT in CMOS."));
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}
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GRUB_MOD_FINI(cmostest)
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{
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grub_unregister_command (cmd);
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grub_unregister_command (cmd_clean);
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grub_unregister_command (cmd_set);
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}
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