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mpv/TOOLS/cpuinfo.c

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/* small utility to extract CPU information
Used by configure to set CPU optimization levels on some operating
systems where /proc/cpuinfo is non-existent or unreliable. */
#include <stdio.h>
#include <sys/time.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#if defined(__MINGW32__) && (__MINGW32_MAJOR_VERSION <= 3) && (__MINGW32_MINOR_VERSION < 10)
#include <sys/timeb.h>
void gettimeofday(struct timeval* t,void* timezone) {
struct timeb timebuffer;
ftime( &timebuffer );
t->tv_sec=timebuffer.time;
t->tv_usec=1000*timebuffer.millitm;
}
#endif
#ifdef __MINGW32__
#define MISSING_USLEEP
#include <windows.h>
#define sleep(t) Sleep(1000*t);
#endif
#ifdef __BEOS__
#define usleep(t) snooze(t)
#endif
#ifdef M_UNIX
typedef long long int64_t;
#define MISSING_USLEEP
#else
#include <inttypes.h>
#endif
#define CPUID_FEATURE_DEF(bit, desc, description) \
{ bit, desc }
typedef struct cpuid_regs {
unsigned int eax;
unsigned int ebx;
unsigned int ecx;
unsigned int edx;
} cpuid_regs_t;
static cpuid_regs_t
cpuid(int func) {
cpuid_regs_t regs;
#define CPUID ".byte 0x0f, 0xa2; "
#ifdef __x86_64__
asm("mov %%rbx, %%rsi\n\t"
#else
asm("mov %%ebx, %%esi\n\t"
#endif
CPUID"\n\t"
#ifdef __x86_64__
"xchg %%rsi, %%rbx\n\t"
#else
"xchg %%esi, %%ebx\n\t"
#endif
: "=a" (regs.eax), "=S" (regs.ebx), "=c" (regs.ecx), "=d" (regs.edx)
: "0" (func));
return regs;
}
static int64_t
rdtsc(void)
{
uint64_t i;
#define RDTSC ".byte 0x0f, 0x31; "
asm volatile (RDTSC : "=A"(i) : );
return i;
}
static const char*
brandname(int i)
{
const static char* brandmap[] = {
NULL,
"Intel(R) Celeron(R) processor",
"Intel(R) Pentium(R) III processor",
"Intel(R) Pentium(R) III Xeon(tm) processor",
"Intel(R) Pentium(R) III processor",
NULL,
"Mobile Intel(R) Pentium(R) III processor-M",
"Mobile Intel(R) Celeron(R) processor"
};
if (i >= sizeof(brandmap))
return NULL;
else
return brandmap[i];
}
static void
store32(char *d, unsigned int v)
{
d[0] = v & 0xff;
d[1] = (v >> 8) & 0xff;
d[2] = (v >> 16) & 0xff;
d[3] = (v >> 24) & 0xff;
}
int
main(int argc, char **argv)
{
cpuid_regs_t regs, regs_ext;
char idstr[13];
unsigned max_cpuid;
unsigned max_ext_cpuid;
unsigned int amd_flags;
unsigned int amd_flags2;
const char *model_name = NULL;
int i;
char processor_name[49];
regs = cpuid(0);
max_cpuid = regs.eax;
/* printf("%d CPUID function codes\n", max_cpuid+1); */
store32(idstr+0, regs.ebx);
store32(idstr+4, regs.edx);
store32(idstr+8, regs.ecx);
idstr[12] = 0;
printf("vendor_id\t: %s\n", idstr);
regs_ext = cpuid((1<<31) + 0);
max_ext_cpuid = regs_ext.eax;
if (max_ext_cpuid >= (1<<31) + 1) {
regs_ext = cpuid((1<<31) + 1);
amd_flags = regs_ext.edx;
amd_flags2 = regs_ext.ecx;
if (max_ext_cpuid >= (1<<31) + 4) {
for (i = 2; i <= 4; i++) {
regs_ext = cpuid((1<<31) + i);
store32(processor_name + (i-2)*16, regs_ext.eax);
store32(processor_name + (i-2)*16 + 4, regs_ext.ebx);
store32(processor_name + (i-2)*16 + 8, regs_ext.ecx);
store32(processor_name + (i-2)*16 + 12, regs_ext.edx);
}
processor_name[48] = 0;
model_name = processor_name;
}
} else {
amd_flags = 0;
amd_flags2 = 0;
}
if (max_cpuid >= 1) {
static struct {
int bit;
char *desc;
} cap[] = {
CPUID_FEATURE_DEF(0, "fpu", "Floating-point unit on-chip"),
CPUID_FEATURE_DEF(1, "vme", "Virtual Mode Enhancements"),
CPUID_FEATURE_DEF(2, "de", "Debugging Extension"),
CPUID_FEATURE_DEF(3, "pse", "Page Size Extension"),
CPUID_FEATURE_DEF(4, "tsc", "Time Stamp Counter"),
CPUID_FEATURE_DEF(5, "msr", "Pentium Processor MSR"),
CPUID_FEATURE_DEF(6, "pae", "Physical Address Extension"),
CPUID_FEATURE_DEF(7, "mce", "Machine Check Exception"),
CPUID_FEATURE_DEF(8, "cx8", "CMPXCHG8B Instruction Supported"),
CPUID_FEATURE_DEF(9, "apic", "On-chip APIC Hardware Enabled"),
CPUID_FEATURE_DEF(11, "sep", "SYSENTER and SYSEXIT"),
CPUID_FEATURE_DEF(12, "mtrr", "Memory Type Range Registers"),
CPUID_FEATURE_DEF(13, "pge", "PTE Global Bit"),
CPUID_FEATURE_DEF(14, "mca", "Machine Check Architecture"),
CPUID_FEATURE_DEF(15, "cmov", "Conditional Move/Compare Instruction"),
CPUID_FEATURE_DEF(16, "pat", "Page Attribute Table"),
CPUID_FEATURE_DEF(17, "pse36", "Page Size Extension 36-bit"),
CPUID_FEATURE_DEF(18, "pn", "Processor Serial Number"),
CPUID_FEATURE_DEF(19, "cflsh", "CFLUSH instruction"),
CPUID_FEATURE_DEF(21, "dts", "Debug Store"),
CPUID_FEATURE_DEF(22, "acpi", "Thermal Monitor and Clock Ctrl"),
CPUID_FEATURE_DEF(23, "mmx", "MMX Technology"),
CPUID_FEATURE_DEF(24, "fxsr", "FXSAVE/FXRSTOR"),
CPUID_FEATURE_DEF(25, "sse", "SSE Extensions"),
CPUID_FEATURE_DEF(26, "sse2", "SSE2 Extensions"),
CPUID_FEATURE_DEF(27, "ss", "Self Snoop"),
CPUID_FEATURE_DEF(28, "ht", "Multi-threading"),
CPUID_FEATURE_DEF(29, "tm", "Therm. Monitor"),
CPUID_FEATURE_DEF(30, "ia64", "IA-64 Processor"),
CPUID_FEATURE_DEF(31, "pbe", "Pend. Brk. EN."),
{ -1 }
};
static struct {
int bit;
char *desc;
} cap2[] = {
CPUID_FEATURE_DEF(0, "pni", "SSE3 Extensions"),
CPUID_FEATURE_DEF(3, "monitor", "MONITOR/MWAIT"),
CPUID_FEATURE_DEF(4, "ds_cpl", "CPL Qualified Debug Store"),
CPUID_FEATURE_DEF(5, "vmx", "Virtual Machine Extensions"),
CPUID_FEATURE_DEF(6, "smx", "Safer Mode Extensions"),
CPUID_FEATURE_DEF(7, "est", "Enhanced Intel SpeedStep Technology"),
CPUID_FEATURE_DEF(8, "tm2", "Thermal Monitor 2"),
CPUID_FEATURE_DEF(9, "ssse3", "Supplemental SSE3"),
CPUID_FEATURE_DEF(10, "cid", "L1 Context ID"),
CPUID_FEATURE_DEF(13, "cx16", "CMPXCHG16B Available"),
CPUID_FEATURE_DEF(14, "xtpr", "xTPR Disable"),
CPUID_FEATURE_DEF(18, "dca", "Direct Cache Access"),
{ -1 }
};
static struct {
int bit;
char *desc;
} cap_amd[] = {
CPUID_FEATURE_DEF(11, "syscall", "SYSCALL and SYSRET"),
CPUID_FEATURE_DEF(19, "mp", "MP Capable"),
CPUID_FEATURE_DEF(20, "nx", "No-Execute Page Protection"),
CPUID_FEATURE_DEF(22, "mmxext","MMX Technology (AMD Extensions)"),
CPUID_FEATURE_DEF(25, "fxsr_opt", "Fast FXSAVE/FXRSTOR"),
CPUID_FEATURE_DEF(27, "rdtscp", "RDTSCP Instruction"),
CPUID_FEATURE_DEF(29, "lm", "Long Mode Capable"),
CPUID_FEATURE_DEF(30, "3dnowext", "3DNow! Extensions"),
CPUID_FEATURE_DEF(31, "3dnow", "3DNow!"),
{ -1 }
};
static struct {
int bit;
char *desc;
} cap_amd2[] = {
CPUID_FEATURE_DEF(0, "lahf_lm", "LAHF/SAHF Supported in 64-bit Mode"),
CPUID_FEATURE_DEF(1, "cmp_legacy", "Chip Multi-Core"),
CPUID_FEATURE_DEF(2, "svm", "Secure Virtual Machine"),
CPUID_FEATURE_DEF(4, "cr8legacy", "CR8 Available in Legacy Mode"),
{ -1 }
};
unsigned int family, model, stepping;
regs = cpuid(1);
family = (regs.eax >> 8) & 0xf;
model = (regs.eax >> 4) & 0xf;
stepping = regs.eax & 0xf;
if (family == 0xf)
{
family += (regs.eax >> 20) & 0xff;
model += ((regs.eax >> 16) & 0xf) << 4;
}
printf("cpu family\t: %d\n"
"model\t\t: %d\n"
"stepping\t: %d\n" ,
family,
model,
stepping);
if (strstr(idstr, "Intel") && !model_name) {
if (family == 6 && model == 0xb && stepping == 1)
model_name = "Intel (R) Celeron (R) processor";
else
model_name = brandname(regs.ebx & 0xf);
}
printf("flags\t\t:");
for (i = 0; cap[i].bit >= 0; i++) {
if (regs.edx & (1 << cap[i].bit)) {
printf(" %s", cap[i].desc);
}
}
for (i = 0; cap2[i].bit >= 0; i++) {
if (regs.ecx & (1 << cap2[i].bit)) {
printf(" %s", cap2[i].desc);
}
}
/* k6_mtrr is supported by some AMD K6-2/K6-III CPUs but
it is not indicated by a CPUID feature bit, so we
have to check the family, model and stepping instead. */
if (strstr(idstr, "AMD") &&
family == 5 &&
(model >= 9 || model == 8 && stepping >= 8))
printf(" %s", "k6_mtrr");
/* similar for cyrix_arr. */
if (strstr(idstr, "Cyrix") &&
(family == 5 && model < 4 || family == 6))
printf(" %s", "cyrix_arr");
/* as well as centaur_mcr. */
if (strstr(idstr, "Centaur") &&
family == 5)
printf(" %s", "centaur_mcr");
for (i = 0; cap_amd[i].bit >= 0; i++) {
if (amd_flags & (1 << cap_amd[i].bit)) {
printf(" %s", cap_amd[i].desc);
}
}
for (i = 0; cap_amd2[i].bit >= 0; i++) {
if (amd_flags2 & (1 << cap_amd2[i].bit)) {
printf(" %s", cap_amd2[i].desc);
}
}
printf("\n");
if (regs.edx & (1 << 4)) {
int64_t tsc_start, tsc_end;
struct timeval tv_start, tv_end;
int usec_delay;
tsc_start = rdtsc();
gettimeofday(&tv_start, NULL);
#ifdef MISSING_USLEEP
sleep(1);
#else
usleep(100000);
#endif
tsc_end = rdtsc();
gettimeofday(&tv_end, NULL);
usec_delay = 1000000 * (tv_end.tv_sec - tv_start.tv_sec)
+ (tv_end.tv_usec - tv_start.tv_usec);
printf("cpu MHz\t\t: %.3f\n",
(double)(tsc_end-tsc_start) / usec_delay);
}
}
printf("model name\t: ");
if (model_name)
printf("%s\n", model_name);
else
printf("Unknown %s CPU\n", idstr);
}
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