/* * GRUB -- GRand Unified Bootloader * Copyright (C) 2009 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 . */ #include #include #include #include #include GRUB_MOD_LICENSE ("GPLv3+"); static grub_err_t parse_args (int argc, char *argv[], int *byte, int *bit) { char *rest; if (argc != 1) return grub_error (GRUB_ERR_BAD_ARGUMENT, "address required"); *byte = grub_strtoul (argv[0], &rest, 0); if (*rest != ':') return grub_error (GRUB_ERR_BAD_ARGUMENT, "address required"); *bit = grub_strtoul (rest + 1, 0, 0); return GRUB_ERR_NONE; } static grub_err_t grub_cmd_cmostest (struct grub_command *cmd __attribute__ ((unused)), int argc, char *argv[]) { int byte, bit; grub_err_t err; grub_uint8_t value; err = parse_args (argc, argv, &byte, &bit); if (err) return err; err = grub_cmos_read (byte, &value); if (err) return err; if (value & (1 << bit)) return GRUB_ERR_NONE; return grub_error (GRUB_ERR_TEST_FAILURE, "false"); } static grub_err_t grub_cmd_cmosclean (struct grub_command *cmd __attribute__ ((unused)), int argc, char *argv[]) { int byte, bit; grub_err_t err; grub_uint8_t value; err = parse_args (argc, argv, &byte, &bit); if (err) return err; err = grub_cmos_read (byte, &value); if (err) return err; return grub_cmos_write (byte, value & (~(1 << bit))); } static grub_command_t cmd, cmd_clean; GRUB_MOD_INIT(cmostest) { cmd = grub_register_command ("cmostest", grub_cmd_cmostest, N_("BYTE:BIT"), N_("Test bit at BYTE:BIT in CMOS.")); cmd_clean = grub_register_command ("cmosclean", grub_cmd_cmosclean, N_("BYTE:BIT"), N_("Clean bit at BYTE:BIT in CMOS.")); } GRUB_MOD_FINI(cmostest) { grub_unregister_command (cmd); grub_unregister_command (cmd_clean); }