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[cmdline] Add "cpuid" command

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Allow x86 CPU feature flags (such as support for 64-bit mode) to be
checked using the "cpuid" command.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2012-06-06 16:08:24 +01:00
parent 1050135159
commit 591541af66
9 changed files with 310 additions and 161 deletions
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94
src/arch/x86/hci/commands/cpuid_cmd.c Normal file
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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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
FILE_LICENCE ( GPL2_OR_LATER );
#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 ( "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,
"[--amd] [--ecx] <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,
};