2012-06-06 17:08:24 +02:00
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/*
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* Copyright (C) 2012 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* 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 this program; if not, write to the Free Software
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2012-07-20 20:55:45 +02:00
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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2012-06-06 17:08:24 +02:00
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*/
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FILE_LICENCE ( GPL2_OR_LATER );
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#include <stdint.h>
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#include <stdio.h>
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#include <errno.h>
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#include <getopt.h>
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#include <ipxe/cpuid.h>
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#include <ipxe/command.h>
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#include <ipxe/parseopt.h>
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/** @file
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*
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* x86 CPU feature detection command
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*
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*/
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/** "cpuid" options */
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struct cpuid_options {
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/** Check AMD-defined features (%eax=0x80000001) */
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int amd;
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/** Check features defined via %ecx */
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int ecx;
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};
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/** "cpuid" option list */
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static struct option_descriptor cpuid_opts[] = {
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2012-06-12 12:32:24 +02:00
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OPTION_DESC ( "ext", 'e', no_argument,
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struct cpuid_options, amd, parse_flag ),
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/* "--amd" retained for backwards compatibility */
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2012-06-06 17:08:24 +02:00
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OPTION_DESC ( "amd", 'a', no_argument,
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struct cpuid_options, amd, parse_flag ),
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OPTION_DESC ( "ecx", 'c', no_argument,
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struct cpuid_options, ecx, parse_flag ),
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};
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/** "cpuid" command descriptor */
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static struct command_descriptor cpuid_cmd =
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COMMAND_DESC ( struct cpuid_options, cpuid_opts, 1, 1,
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2012-06-12 12:32:24 +02:00
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"[--ext] [--ecx] <bit>" );
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2012-06-06 17:08:24 +02:00
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/**
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* The "cpuid" command
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*
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* @v argc Argument count
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* @v argv Argument list
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* @ret rc Return status code
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*/
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static int cpuid_exec ( int argc, char **argv ) {
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struct cpuid_options opts;
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struct x86_features features;
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struct x86_feature_registers *feature_regs;
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uint32_t feature_reg;
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unsigned int bit;
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int rc;
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/* Parse options */
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if ( ( rc = parse_options ( argc, argv, &cpuid_cmd, &opts ) ) != 0 )
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return rc;
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/* Parse bit number */
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if ( ( rc = parse_integer ( argv[optind], &bit ) ) != 0 )
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return rc;
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/* Get CPU features */
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x86_features ( &features );
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/* Extract relevant feature register */
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feature_regs = ( opts.amd ? &features.amd : &features.intel );
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feature_reg = ( opts.ecx ? feature_regs->ecx : feature_regs->edx );
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/* Check presence of specified feature */
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return ( ( feature_reg & ( 1 << bit ) ) ? 0 : -ENOENT );
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}
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/** x86 CPU feature detection command */
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struct command cpuid_command __command = {
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.name = "cpuid",
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.exec = cpuid_exec,
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};
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