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- /*
- * Copyright (C) 2012 Michael Brown <mbrown@fensystems.co.uk>.
- *
- * This program 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 2 of the
- * License, or any later version.
- *
- * This program 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 this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- * 02110-1301, USA.
- *
- * You can also choose to distribute this program under the terms of
- * the Unmodified Binary Distribution Licence (as given in the file
- * COPYING.UBDL), provided that you have satisfied its requirements.
- */
-
- FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
-
- #include <stdint.h>
- #include <stdio.h>
- #include <errno.h>
- #include <getopt.h>
- #include <ipxe/cpuid.h>
- #include <ipxe/command.h>
- #include <ipxe/parseopt.h>
-
- /** @file
- *
- * x86 CPU feature detection command
- *
- */
-
- /** "cpuid" options */
- struct cpuid_options {
- /** Check AMD-defined features (%eax=0x80000001) */
- int amd;
- /** Check features defined via %ecx */
- int ecx;
- };
-
- /** "cpuid" option list */
- static struct option_descriptor cpuid_opts[] = {
- OPTION_DESC ( "ext", 'e', no_argument,
- struct cpuid_options, amd, parse_flag ),
- /* "--amd" retained for backwards compatibility */
- OPTION_DESC ( "amd", 'a', no_argument,
- struct cpuid_options, amd, parse_flag ),
- OPTION_DESC ( "ecx", 'c', no_argument,
- struct cpuid_options, ecx, parse_flag ),
- };
-
- /** "cpuid" command descriptor */
- static struct command_descriptor cpuid_cmd =
- COMMAND_DESC ( struct cpuid_options, cpuid_opts, 1, 1, "<bit>" );
-
- /**
- * The "cpuid" command
- *
- * @v argc Argument count
- * @v argv Argument list
- * @ret rc Return status code
- */
- static int cpuid_exec ( int argc, char **argv ) {
- struct cpuid_options opts;
- struct x86_features features;
- struct x86_feature_registers *feature_regs;
- uint32_t feature_reg;
- unsigned int bit;
- int rc;
-
- /* Parse options */
- if ( ( rc = parse_options ( argc, argv, &cpuid_cmd, &opts ) ) != 0 )
- return rc;
-
- /* Parse bit number */
- if ( ( rc = parse_integer ( argv[optind], &bit ) ) != 0 )
- return rc;
-
- /* Get CPU features */
- x86_features ( &features );
-
- /* Extract relevant feature register */
- feature_regs = ( opts.amd ? &features.amd : &features.intel );
- feature_reg = ( opts.ecx ? feature_regs->ecx : feature_regs->edx );
-
- /* Check presence of specified feature */
- return ( ( feature_reg & ( 1 << bit ) ) ? 0 : -ENOENT );
- }
-
- /** x86 CPU feature detection command */
- struct command cpuid_command __command = {
- .name = "cpuid",
- .exec = cpuid_exec,
- };
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