cpuid_cmd.c File Reference

x86 CPU feature detection command More...

#include <stdint.h>
#include <stdio.h>
#include <errno.h>
#include <getopt.h>
#include <ipxe/cpuid.h>
#include <ipxe/command.h>
#include <ipxe/parseopt.h>

Go to the source code of this file.

Data Structures
struct	cpuid_options
	"cpuid" options More...

Functions
	FILE_LICENCE (GPL2_OR_LATER_OR_UBDL)
static int	cpuid_exec (int argc, char **argv)
	The "cpuid" command. More...

Variables
static struct option_descriptor	cpuid_opts []
	"cpuid" option list More...
static struct command_descriptor	cpuid_cmd
	"cpuid" command descriptor More...
struct command cpuid_command	__command
	x86 CPU feature detection command More...

Detailed Description

x86 CPU feature detection command

Definition in file cpuid_cmd.c.

Function Documentation

FILE_LICENCE()

FILE_LICENCE

(

GPL2_OR_LATER_OR_UBDL

)

cpuid_exec()

static int cpuid_exec ( int  argc, char **  argv  )

static

The "cpuid" command.

Parameters

argc	Argument count
argv	Argument list

Return values

rc	Return status code

Definition at line 70 of file cpuid_cmd.c.

                                                {
        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 );
}

References bit, cpuid_cmd, x86_feature_registers::ecx, x86_feature_registers::edx, ENOENT, features, optind, opts, parse_integer(), parse_options(), rc, and x86_features().

Variable Documentation

cpuid_opts

struct option_descriptor cpuid_opts[]

static

Initial value:

= {
        OPTION_DESC ( "ext", 'e', no_argument,
                      struct cpuid_options, amd, parse_flag ),
        
        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" option list

Definition at line 49 of file cpuid_cmd.c.

cpuid_cmd

struct command_descriptor cpuid_cmd

static

Initial value:

=
        COMMAND_DESC ( struct cpuid_options, cpuid_opts, 1, 1, "<bit>" )

"cpuid" command descriptor

Definition at line 60 of file cpuid_cmd.c.

Referenced by cpuid_exec().

__command

struct command cpuid_command __command

Initial value:

= {
        .name = "cpuid",
        .exec = cpuid_exec,
}

x86 CPU feature detection command

Definition at line 98 of file cpuid_cmd.c.