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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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1
src/arch/x86/Makefile
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@@ -7,6 +7,7 @@ INCDIRS += arch/x86/include
SRCDIRS += arch/x86/core
SRCDIRS += arch/x86/interface/efi
SRCDIRS += arch/x86/prefix
SRCDIRS += arch/x86/hci/commands
# breaks building some of the linux-related objects
CFLAGS += -Ulinux

154
src/arch/x86/core/cpuid.c Normal file
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@@ -0,0 +1,154 @@
/*
* 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 <string.h>
#include <ipxe/cpuid.h>
/** @file
*
* x86 CPU feature detection
*
*/
/**
* Check whether or not CPUID instruction is supported
*
* @ret is_supported CPUID instruction is supported
*/
static int cpuid_is_supported ( void ) {
unsigned long original;
unsigned long inverted;
__asm__ ( "pushf\n\t"
"pushf\n\t"
"pop %0\n\t"
"mov %0,%1\n\t"
"xor %2,%1\n\t"
"push %1\n\t"
"popf\n\t"
"pushf\n\t"
"pop %1\n\t"
"popf\n\t"
: "=&r" ( original ), "=&r" ( inverted )
: "ir" ( CPUID_FLAG ) );
return ( ( original ^ inverted ) & CPUID_FLAG );
}
/**
* Issue CPUID instruction
*
* @v operation CPUID operation
* @v eax Output via %eax
* @v ebx Output via %ebx
* @v ecx Output via %ecx
* @v edx Output via %edx
*/
static inline __attribute__ (( always_inline )) void
cpuid ( uint32_t operation, uint32_t *eax, uint32_t *ebx, uint32_t *ecx,
uint32_t *edx ) {
__asm__ ( "cpuid"
: "=a" ( *eax ), "=b" ( *ebx ), "=c" ( *ecx ), "=d" ( *edx )
: "0" ( operation ) );
}
/**
* Get Intel-defined x86 CPU features
*
* @v features x86 CPU features to fill in
*/
static void x86_intel_features ( struct x86_features *features ) {
uint32_t max_level;
uint32_t discard_a;
uint32_t discard_b;
uint32_t discard_c;
uint32_t discard_d;
/* Check that features are available via CPUID */
cpuid ( CPUID_VENDOR_ID, &max_level, &discard_b, &discard_c,
&discard_d );
if ( max_level < CPUID_FEATURES ) {
DBGC ( features, "CPUID has no Intel-defined features (max "
"level %08x)\n", max_level );
return;
}
/* Get features */
cpuid ( CPUID_FEATURES, &discard_a, &discard_b,
&features->intel.ecx, &features->intel.edx );
DBGC ( features, "CPUID Intel features: %%ecx=%08x, %%edx=%08x\n",
features->intel.ecx, features->intel.edx );
}
/**
* Get AMD-defined x86 CPU features
*
* @v features x86 CPU features to fill in
*/
static void x86_amd_features ( struct x86_features *features ) {
uint32_t max_level;
uint32_t discard_a;
uint32_t discard_b;
uint32_t discard_c;
uint32_t discard_d;
/* Check that features are available via CPUID */
cpuid ( CPUID_AMD_MAX_FN, &max_level, &discard_b, &discard_c,
&discard_d );
if ( ( max_level & CPUID_AMD_CHECK_MASK ) != CPUID_AMD_CHECK ) {
DBGC ( features, "CPUID has no extended functions\n" );
return;
}
if ( max_level < CPUID_AMD_FEATURES ) {
DBGC ( features, "CPUID has no AMD-defined features (max "
"level %08x)\n", max_level );
return;
}
/* Get features */
cpuid ( CPUID_AMD_FEATURES, &discard_a, &discard_b,
&features->amd.ecx, &features->amd.edx );
DBGC ( features, "CPUID AMD features: %%ecx=%08x, %%edx=%08x\n",
features->amd.ecx, features->amd.edx );
}
/**
* Get x86 CPU features
*
* @v features x86 CPU features to fill in
*/
void x86_features ( struct x86_features *features ) {
/* Clear all features */
memset ( features, 0, sizeof ( *features ) );
/* Check that CPUID instruction is available */
if ( ! cpuid_is_supported() ) {
DBGC ( features, "CPUID instruction is not supported\n" );
return;
}
/* Get Intel-defined features */
x86_intel_features ( features );
/* Get AMD-defined features */
x86_amd_features ( features );
}

94
src/arch/x86/hci/commands/cpuid_cmd.c Normal file
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@@ -0,0 +1,94 @@
/*
* 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,
};

6
src/arch/x86/include/bits/errfile.h
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@@ -38,8 +38,10 @@ FILE_LICENCE ( GPL2_OR_LATER );
#define ERRFILE_undionly ( ERRFILE_ARCH | ERRFILE_NET | 0x00030000 )
#define ERRFILE_undirom ( ERRFILE_ARCH | ERRFILE_NET | 0x00040000 )
#define ERRFILE_timer_rdtsc ( ERRFILE_ARCH | ERRFILE_DRIVER | 0x00000000 )
#define ERRFILE_timer_bios ( ERRFILE_ARCH | ERRFILE_DRIVER | 0x00010000 )
#define ERRFILE_timer_rdtsc ( ERRFILE_ARCH | ERRFILE_DRIVER | 0x00000000 )
#define ERRFILE_timer_bios ( ERRFILE_ARCH | ERRFILE_DRIVER | 0x00010000 )
#define ERRFILE_cpuid_cmd ( ERRFILE_ARCH | ERRFILE_OTHER | 0x00000000 )
/** @} */

53
src/arch/x86/include/ipxe/cpuid.h Normal file
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@@ -0,0 +1,53 @@
#ifndef _IPXE_CPUID_H
#define _IPXE_CPUID_H
/** @file
*
* x86 CPU feature detection
*
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <stdint.h>
/** An x86 CPU feature register set */
struct x86_feature_registers {
/** Features returned via %ecx */
uint32_t ecx;
/** Features returned via %edx */
uint32_t edx;
};
/** x86 CPU features */
struct x86_features {
/** Intel-defined features (%eax=0x00000001) */
struct x86_feature_registers intel;
/** AMD-defined features (%eax=0x80000001) */
struct x86_feature_registers amd;
};
/** CPUID support flag */
#define CPUID_FLAG 0x00200000UL
/** Get vendor ID and largest standard function */
#define CPUID_VENDOR_ID 0x00000000UL
/** Get standard features */
#define CPUID_FEATURES 0x00000001UL
/** Get largest extended function */
#define CPUID_AMD_MAX_FN 0x80000000UL
/** Extended function existence check */
#define CPUID_AMD_CHECK 0x80000000UL
/** Extended function existence check mask */
#define CPUID_AMD_CHECK_MASK 0xffff0000UL
/** Get extended features */
#define CPUID_AMD_FEATURES 0x80000001UL
extern void x86_features ( struct x86_features *features );
#endif /* _IPXE_CPUID_H */