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/*
* (C) 2000, 2001 Dave Jones.
* Fixes by Arjan van de Ven (arjanv@redhat.com) and
* Philipp Rumpf (prumpf@mandrakesoft.com)
*
* Licensed under the terms of the GNU GPL License version 2.
*
* Routines for retrieving cpuid registers.
*/
#define _LARGEFILE64_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <errno.h>
#define __USE_GNU
#include <sched.h>
#if defined(__FreeBSD__)
# include <sys/ioctl.h>
# include <cpu.h>
#endif
#include "x86info.h"
/*
* sched_* calls weren't stable until 2.3.4
* AFAIK, there's no macro to check for the .4, so we just
* check for the next minor version up. (2.4)
*/
#ifdef __GLIBC__
#if __GLIBC__ < 2 || __GLIBC__ == 2 && __GLIBC_MINOR__ < 4
#error Need at least glibc 2.4
#endif
#endif
/* returns zero on success */
static int native_cpuid(unsigned int cpunr, unsigned long long idx,
unsigned int *eax, unsigned int *ebx,
unsigned int *ecx, unsigned int *edx)
{
cpu_set_t set, tmp_set;
unsigned int a = 0, b = 0, c = 0, d = 0;
int ret;
if (eax != NULL)
a = *eax;
if (ebx != NULL)
b = *ebx;
if (ecx != NULL)
c = *ecx;
if (edx != NULL)
d = *edx;
ret = sched_getaffinity(getpid(), sizeof(set), &set);
if (ret)
return ret;
/* man CPU_SET(3): To duplicate a CPU set, use memcpy(3) */
memcpy(&tmp_set, &set, sizeof(cpu_set_t));
CPU_ZERO(&set);
CPU_SET(cpunr, &set);
ret = sched_setaffinity(getpid(), sizeof(set), &set);
if (ret)
return ret;
asm("cpuid"
: "=a" (a),
"=b" (b),
"+c" (c),
"=d" (d)
: "0" ((unsigned int)idx));
if (eax!=NULL)
*eax = a;
if (ebx!=NULL)
*ebx = b;
if (ecx!=NULL)
*ecx = c;
if (edx!=NULL)
*edx = d;
/* Restore initial sched affinity */
ret = sched_setaffinity(getpid(), sizeof(tmp_set), &tmp_set);
if (ret)
return ret;
return 0;
}
static const char *NATIVE_CPUID_FAILED_MSG = "WARNING: Native cpuid failed\n";
#if defined(__FreeBSD__)
void cpuid(unsigned int CPU_number, unsigned long long idx,
unsigned int *eax,
unsigned int *ebx,
unsigned int *ecx,
unsigned int *edx)
{
static int nodriver=0;
char cpuname[20];
unsigned char buffer[16];
int fh;
cpu_cpuid_args_t args;
if (nodriver == 1) {
if (native_cpuid(CPU_number, idx, eax,ebx,ecx,edx))
printf("%s", NATIVE_CPUID_FAILED_MSG);
return;
}
args.level = idx;
/* Ok, use the /dev/CPU interface in preference to the _up code. */
(void)snprintf(cpuname,18, "/dev/cpu%d", CPU_number);
fh = open(cpuname, O_RDONLY);
if (fh != -1) {
if (ioctl(fh, CPU_CPUID, &args) != 0) {
perror(cpuname);
exit(EXIT_FAILURE);
}
if (eax!=0) *eax = args.data[0];
if (ebx!=0) *ebx = args.data[1];
if (ecx!=0) *ecx = args.data[2];
if (edx!=0) *edx = args.data[3];
if (close(fh) == -1) {
perror("close");
exit(EXIT_FAILURE);
}
} else {
/* Something went wrong, just do UP and hope for the best. */
nodriver = 1;
if (nrCPUs != 1)
perror(cpuname);
if (native_cpuid(CPU_number, idx, eax,ebx,ecx,edx))
printf("%s", NATIVE_CPUID_FAILED_MSG);
return;
}
}
#else /* !__FreeBSD__ */
/* Kernel CPUID driver's minimum supported read size
* (see linux/arch/i386/kernel/cpuid.c)
*/
#define CPUID_CHUNK_SIZE (16)
void cpuid(unsigned int CPU_number, unsigned long long idx,
unsigned int *eax,
unsigned int *ebx,
unsigned int *ecx,
unsigned int *edx)
{
static int nodriver=0;
char cpuname[20];
unsigned char buffer[CPUID_CHUNK_SIZE];
unsigned int *ptr = (unsigned int *)buffer;
int fh;
if (eax != NULL) {
*eax = (unsigned int) idx;
if (*eax == 4)
*ecx = idx >> 32;
}
if (nodriver == 1) {
if (native_cpuid(CPU_number, idx, eax,ebx,ecx,edx))
printf("%s", NATIVE_CPUID_FAILED_MSG);
return;
}
memset(cpuname, 0, sizeof(cpuname));
#ifdef __sun__
/* Solaris doesn't (yet) have per-CPU interface */
(void)snprintf(cpuname, sizeof(cpuname), "/dev/cpu/self/cpuid");
#else
/* Ok, use the /dev/cpu interface in preference to the _up code. */
(void)snprintf(cpuname, sizeof(cpuname), "/dev/cpu/%d/cpuid", CPU_number);
#endif
fh = open(cpuname, O_RDONLY);
if (fh != -1) {
#ifndef S_SPLINT_S
lseek64(fh, (off64_t)idx, SEEK_CUR);
#endif
if (read(fh, &buffer[0], CPUID_CHUNK_SIZE) == -1) {
perror(cpuname);
exit(EXIT_FAILURE);
}
if (eax!=0) *eax = *ptr;
if (ebx!=0) *ebx = *(++ptr);
if (ecx!=0) *ecx = *(++ptr);
if (edx!=0) *edx = *(++ptr);
if (close(fh) == -1) {
perror("close");
exit(EXIT_FAILURE);
}
} else {
/* Something went wrong, just do UP and hope for the best. */
nodriver = 1;
if (native_cpuid(CPU_number, idx, eax,ebx,ecx,edx))
printf("%s", NATIVE_CPUID_FAILED_MSG);
return;
}
}
#endif /* __FreeBSD__ */
void cpuid4(unsigned int CPU_number, unsigned long long idx,
unsigned int *eax, unsigned int *ebx, unsigned int *ecx, unsigned int *edx)
{
cpuid(CPU_number, 4 | (idx << 32), eax, ebx, ecx, edx);
}
/* Some CPUID calls want 'count' to be placed in ecx */
void cpuid_count(unsigned int CPU_number, unsigned int op, int count,
unsigned int *eax, unsigned int *ebx,
unsigned int *ecx, unsigned int *edx)
{
*ecx = count;
cpuid(CPU_number, op, eax, ebx, ecx, edx);
}
unsigned int cpuid_ebx(unsigned int CPU_number, unsigned int op)
{
unsigned int eax, ebx, ecx, edx;
cpuid(CPU_number, op, &eax, &ebx, &ecx, &edx);
return ebx;
}
void dump_raw_cpuid(int cpunum, unsigned int begin, unsigned int end)
{
unsigned int i;
unsigned int eax, ebx, ecx, edx;
/* Dump all the CPUID results in raw hex */
for (i = begin; i <= end; i++) {
cpuid(cpunum, i, &eax, &ebx, &ecx, &edx);
printf("eax in: 0x%08x, eax = %08x ebx = %08x ecx = %08x edx = %08x\n", i, eax, ebx, ecx, edx);
}
printf("\n");
}
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