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Commit 004098ab authored by Rusty Russell's avatar Rusty Russell
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Merge branch 'master' of ozlabs.org:ccan

parents 447cfb71 7cc24627
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Showing with 189 additions and 152 deletions
ccan/cpuid/cpuid.c
View file @ 004098ab
......@@ -31,8 +31,8 @@
#include <string.h>
enum {
CPU_PROC_BRAND_STRING_INTERNAL0 = 0x80000003,
CPU_PROC_BRAND_STRING_INTERNAL1 = 0x80000004
CPUID_PROC_BRAND_STRING_INTERNAL0 = 0x80000003,
CPUID_PROC_BRAND_STRING_INTERNAL1 = 0x80000004
};
#ifndef _MSC_VER
......@@ -61,35 +61,6 @@ static void ___cpuid(cpuid_t info, uint32_t *eax, uint32_t *ebx, uint32_t *ecx,
}
#endif
static struct {
uint32_t feature;
uint32_t mask;
bool use_edx; /* ecx will be used if false. */
} features[] = {
{ CF_MMX, 1 << 23, true },
{ CF_SSE, 1 << 25, true },
{ CF_SSE2, 1 << 26, true },
{ CF_SSE3, 1 << 9, false },
{ CF_FPU, 1 << 0, true },
{ CF_TSC, 1 << 4, true },
{ CF_MSR, 1 << 5, true },
{ CF_SSSE3, 1 << 9, false },
{ CF_AVX, 1 << 28, false },
/* Extended ones. */
{ CEF_x64, 1 << 30, true },
{ CEF_FPU, 1 << 0, true },
{ CEF_DE, 1 << 2, true },
{ CEF_SYSCALLRET, 1 << 11, true },
{ CEF_CMOV, 1 << 15, true },
{ CEF_SSE4a, 1 << 6, false },
{ CEF_FMA4, 1 << 16, false },
{ CEF_XOP, 1 << 11, false }
};
bool cpuid_is_supported(void)
{
int ret = 0;
......@@ -160,8 +131,8 @@ bool cpuid_is_supported(void)
pushfd
pop eax
xor eax, ecx
shr eax, 0x21
and eax, 0x1
shr eax, 21
and eax, 1
push ecx
popfd
......@@ -173,30 +144,54 @@ bool cpuid_is_supported(void)
bool cpuid_test_feature(cpuid_t feature)
{
if (feature > CPU_VIRT_PHYS_ADDR_SIZES || feature < CPU_EXTENDED_PROC_INFO_FEATURE_BITS)
if (feature > CPUID_VIRT_PHYS_ADDR_SIZES || feature < CPUID_EXTENDED_PROC_INFO_FEATURE_BITS)
return false;
return (feature <= cpuid_highest_ext_func_supported());
}
bool cpuid_has_feature(int feature, bool extended)
bool cpuid_has_ecxfeature(int feature)
{
uint32_t eax, ebx, ecx, edx, i;
if (!extended)
___cpuid(CPU_PROCINFO_AND_FEATUREBITS, &eax, &ebx, &ecx, &edx);
else
___cpuid(CPU_EXTENDED_PROC_INFO_FEATURE_BITS, &eax, &ebx, &ecx, &edx);
for (i = 0; i < sizeof(features) / sizeof(features[0]); ++i) {
if (features[i].feature == feature) {
if (features[i].use_edx)
return (edx & features[i].mask);
else
return (ecx & features[i].mask);
}
static uint32_t _ecx;
if (_ecx == 0) {
#if defined(__GNUC__) || defined(__clang__)
asm volatile(
"cpuid\n\t"
: "=c" (_ecx)
: "a" (CPUID_PROCINFO_AND_FEATUREBITS)
);
#elif defined _MSC_VER
__asm {
mov eax, CPUID_PROCINFO_AND_FEATUREBITS
cpuid
mov _ecx, ecx
};
#endif
}
return false;
return (_ecx & feature) == feature;
}
bool cpuid_has_edxfeature(int feature)
{
static uint32_t _edx;
if (_edx == 0) {
#if defined(__GNUC__) || defined(__clang__)
asm volatile(
"cpuid\n\t"
: "=d" (_edx)
: "a" (CPUID_PROCINFO_AND_FEATUREBITS)
);
#elif defined _MSC_VER
__asm {
mov eax, CPUID_PROCINFO_AND_FEATUREBITS
cpuid
mov _edx, edx
};
#endif
}
return (_edx & feature) == feature;
}
static const char *const cpuids[] = {
......@@ -228,7 +223,7 @@ cputype_t cpuid_get_cpu_type(void)
} u;
uint32_t i;
___cpuid(CPU_VENDORID, &i, &u.bufu32[0], &u.bufu32[2], &u.bufu32[1]);
___cpuid(CPUID_VENDORID, &i, &u.bufu32[0], &u.bufu32[2], &u.bufu32[1]);
for (i = 0; i < sizeof(cpuids) / sizeof(cpuids[0]); ++i) {
if (strncmp(cpuids[i], u.buf, 12) == 0) {
cputype = (cputype_t)i;
......@@ -259,11 +254,11 @@ uint32_t cpuid_highest_ext_func_supported(void)
asm volatile(
"cpuid\n\t"
: "=a" (highest)
: "a" (CPU_HIGHEST_EXTENDED_FUNCTION_SUPPORTED)
: "a" (CPUID_HIGHEST_EXTENDED_FUNCTION_SUPPORTED)
);
#elif defined _MSC_VER
__asm {
mov eax, CPU_HIGHEST_EXTENDED_FUNCTION_SUPPORTED
mov eax, CPUID_HIGHEST_EXTENDED_FUNCTION_SUPPORTED
cpuid
mov highest, eax
};
......@@ -278,23 +273,23 @@ void cpuid(cpuid_t info, uint32_t *buf)
/* Sanity checks, make sure we're not trying to do something
* invalid or we are trying to get information that isn't supported
* by the CPU. */
if (info > CPU_VIRT_PHYS_ADDR_SIZES || (info > CPU_HIGHEST_EXTENDED_FUNCTION_SUPPORTED
if (info > CPUID_VIRT_PHYS_ADDR_SIZES || (info > CPUID_HIGHEST_EXTENDED_FUNCTION_SUPPORTED
&& !cpuid_test_feature(info)))
return;
if (info == CPU_PROC_BRAND_STRING) {
if (info == CPUID_PROC_BRAND_STRING) {
static char cached[48] = { 0 };
if (cached[0] == '\0') {
___cpuid(CPU_PROC_BRAND_STRING, &buf[0], &buf[1], &buf[2], &buf[3]);
___cpuid(CPU_PROC_BRAND_STRING_INTERNAL0, &buf[4], &buf[5], &buf[6], &buf[7]);
___cpuid(CPU_PROC_BRAND_STRING_INTERNAL1, &buf[8], &buf[9], &buf[10], &buf[11]);
___cpuid(CPUID_PROC_BRAND_STRING, &buf[0], &buf[1], &buf[2], &buf[3]);
___cpuid(CPUID_PROC_BRAND_STRING_INTERNAL0, &buf[4], &buf[5], &buf[6], &buf[7]);
___cpuid(CPUID_PROC_BRAND_STRING_INTERNAL1, &buf[8], &buf[9], &buf[10], &buf[11]);
memcpy(cached, buf, sizeof cached);
} else
buf = (uint32_t *)cached;
return;
} else if (info == CPU_HIGHEST_EXTENDED_FUNCTION_SUPPORTED) {
} else if (info == CPUID_HIGHEST_EXTENDED_FUNCTION_SUPPORTED) {
*buf = cpuid_highest_ext_func_supported();
return;
}
......@@ -303,42 +298,52 @@ void cpuid(cpuid_t info, uint32_t *buf)
___cpuid(info, &eax, &ebx, &ecx, &edx);
switch (info) {
case CPU_VENDORID:
case CPUID_VENDORID:
buf[0] = ebx;
buf[1] = edx;
buf[2] = ecx;
break;
case CPU_PROCINFO_AND_FEATUREBITS:
buf[0] = eax; /* The so called "signature" of the CPU. */
buf[1] = edx; /* Feature flags #1. */
buf[2] = ecx; /* Feature flags #2. */
buf[3] = ebx; /* Additional feature information. */
case CPUID_PROCINFO_AND_FEATUREBITS:
buf[0] = (eax & 0x0F); /* Stepping */
buf[1] = (eax >> 4) & 0x0F; /* Model */
buf[2] = (eax >> 8) & 0x0F; /* Family */
buf[3] = (eax >> 16) & 0x0F; /* Extended Model. */
buf[4] = (eax >> 24) & 0x0F; /* Extended Family. */
buf[5] = edx; /* Feature flags #1. */
buf[6] = ecx; /* Feature flags #2. */
/* Additional Feature information. */
buf[7] = ebx & 0xFF;
buf[8] = (ebx >> 8) & 0xFF;
buf[9] = (ebx >> 16) & 0xFF;
buf[10] = (ebx >> 24) & 0xFF;
break;
case CPU_CACHE_AND_TLBD_INFO:
case CPUID_CACHE_AND_TLBD_INFO:
buf[0] = eax;
buf[1] = ebx;
buf[2] = ecx;
buf[3] = edx;
break;
case CPU_EXTENDED_PROC_INFO_FEATURE_BITS:
case CPUID_EXTENDED_PROC_INFO_FEATURE_BITS:
buf[0] = edx;
buf[1] = ecx;
break;
case CPU_L1_CACHE_AND_TLB_IDS:
case CPUID_L1_CACHE_AND_TLB_IDS:
buf[0] = eax;
buf[1] = ebx;
buf[2] = ecx;
buf[3] = edx;
break;
case CPU_EXTENDED_L2_CACHE_FEATURES:
case CPUID_EXTENDED_L2_CACHE_FEATURES:
buf[0] = ecx & 0xFF; /* Line size. */
buf[1] = (ecx >> 12) & 0xFF; /* Associativity. */
buf[2] = ecx >> 16; /* Cache size. */
break;
case CPU_ADV_POWER_MGT_INFO:
case CPUID_ADV_POWER_MGT_INFO:
*buf = edx;
break;
case CPU_VIRT_PHYS_ADDR_SIZES:
case CPUID_VIRT_PHYS_ADDR_SIZES:
buf[0] = eax & 0xFF; /* physical. */
buf[1] = (eax >> 8) & 0xFF; /* virtual. */
break;
......
ccan/cpuid/cpuid.h
View file @ 004098ab
......@@ -30,71 +30,110 @@
*
* This is used as a parameter in cpuid().
*
* CPU_VENDORID:
* CPUID_VENDORID:
* The CPU's Vendor ID.
*
* CPU_PROCINFO_AND_FEATUREBITS:
* CPUID_PROCINFO_AND_FEATUREBITS:
* Processor information and feature bits (SSE, etc.).
*
* CPU_CACHE_AND_TLBD_INFO
* CPUID_CACHE_AND_TLBD_INFO
* Cache and TLBD Information.
*
* CPU_HIGHEST_EXTENDED_FUNCTION_SUPPORTED:
* CPUID_HIGHEST_EXTENDED_FUNCTION_SUPPORTED:
* Highest extended function supported address.
* Can be like 0x80000008.
*
* CPU_EXTENDED_PROC_INFO_FEATURE_BITS:
* CPUID_EXTENDED_PROC_INFO_FEATURE_BITS:
* Extended processor information and feature bits (64bit etc.)
*
* CPU_PROC_BRAND_STRING:
* CPUID_PROC_BRAND_STRING:
* The Processor's brand string.
*
* CPU_L1_CACHE_AND_TLB_IDS:
* CPUID_L1_CACHE_AND_TLB_IDS:
* L1 Cache and TLB Identifications.
*
* CPU_EXTENDED_L2_CACHE_FEATURES:
* CPUID_EXTENDED_L2_CACHE_FEATURES:
* Extended L2 Cache features.
*
* CPU_ADV_POWER_MGT_INFO:
* CPUID_ADV_POWER_MGT_INFO:
* Advaned power management information.
*
* CPU_VIRT_PHYS_ADDR_SIZES:
* CPUID_VIRT_PHYS_ADDR_SIZES:
* Virtual and physical address sizes.
*/
typedef enum cpuid {
CPU_VENDORID = 0,
CPU_PROCINFO_AND_FEATUREBITS = 1,
CPU_CACHE_AND_TLBD_INFO = 2,
CPUID_VENDORID = 0,
CPUID_PROCINFO_AND_FEATUREBITS = 1,
CPUID_CACHE_AND_TLBD_INFO = 2,
CPU_HIGHEST_EXTENDED_FUNCTION_SUPPORTED = 0x80000000,
CPU_EXTENDED_PROC_INFO_FEATURE_BITS = 0x80000001,
CPU_PROC_BRAND_STRING = 0x80000002,
CPU_L1_CACHE_AND_TLB_IDS = 0x80000005,
CPU_EXTENDED_L2_CACHE_FEATURES = 0x80000006,
CPU_ADV_POWER_MGT_INFO = 0x80000007,
CPU_VIRT_PHYS_ADDR_SIZES = 0x80000008
CPUID_HIGHEST_EXTENDED_FUNCTION_SUPPORTED = 0x80000000,
CPUID_EXTENDED_PROC_INFO_FEATURE_BITS = 0x80000001,
CPUID_PROC_BRAND_STRING = 0x80000002,
CPUID_L1_CACHE_AND_TLB_IDS = 0x80000005,
CPUID_EXTENDED_L2_CACHE_FEATURES = 0x80000006,
CPUID_ADV_POWER_MGT_INFO = 0x80000007,
CPUID_VIRT_PHYS_ADDR_SIZES = 0x80000008
} cpuid_t;
#define CF_MMX 0
#define CF_SSE 1
#define CF_SSE2 2
#define CF_SSE3 3
#define CF_FPU 4
#define CF_TSC 5
#define CF_MSR 6
#define CF_SSSE3 7
#define CF_AVX 8
#define CF_FMA 9
enum {
CPUID_FEAT_ECX_SSE3 = 1 << 0,
CPUID_FEAT_ECX_PCLMUL = 1 << 1,
CPUID_FEAT_ECX_DTES64 = 1 << 2,
CPUID_FEAT_ECX_MONITOR = 1 << 3,
CPUID_FEAT_ECX_DS_CPL = 1 << 4,
CPUID_FEAT_ECX_VMX = 1 << 5,
CPUID_FEAT_ECX_SMX = 1 << 6,
CPUID_FEAT_ECX_EST = 1 << 7,
CPUID_FEAT_ECX_TM2 = 1 << 8,
CPUID_FEAT_ECX_SSSE3 = 1 << 9,
CPUID_FEAT_ECX_CID = 1 << 10,
CPUID_FEAT_ECX_FMA = 1 << 12,
CPUID_FEAT_ECX_CX16 = 1 << 13,
CPUID_FEAT_ECX_ETPRD = 1 << 14,
CPUID_FEAT_ECX_PDCM = 1 << 15,
CPUID_FEAT_ECX_DCA = 1 << 18,
CPUID_FEAT_ECX_SSE4_1 = 1 << 19,
CPUID_FEAT_ECX_SSE4_2 = 1 << 20,
CPUID_FEAT_ECX_x2APIC = 1 << 21,
CPUID_FEAT_ECX_MOVBE = 1 << 22,
CPUID_FEAT_ECX_POPCNT = 1 << 23,
CPUID_FEAT_ECX_AES = 1 << 25,
CPUID_FEAT_ECX_XSAVE = 1 << 26,
CPUID_FEAT_ECX_OSXSAVE = 1 << 27,
CPUID_FEAT_ECX_AVX = 1 << 28,
#define CEF_x64 10
#define CEF_FPU 11
#define CEF_DE 12
#define CEF_SYSCALLRET 13
#define CEF_CMOV 14
#define CEF_SSE4a 15
#define CEF_FMA4 16
#define CEF_XOP 17
CPUID_FEAT_EDX_FPU = 1 << 0,
CPUID_FEAT_EDX_VME = 1 << 1,
CPUID_FEAT_EDX_DE = 1 << 2,
CPUID_FEAT_EDX_PSE = 1 << 3,
CPUID_FEAT_EDX_TSC = 1 << 4,
CPUID_FEAT_EDX_MSR = 1 << 5,
CPUID_FEAT_EDX_PAE = 1 << 6,
CPUID_FEAT_EDX_MCE = 1 << 7,
CPUID_FEAT_EDX_CX8 = 1 << 8,
CPUID_FEAT_EDX_APIC = 1 << 9,
CPUID_FEAT_EDX_SEP = 1 << 11,
CPUID_FEAT_EDX_MTRR = 1 << 12,
CPUID_FEAT_EDX_PGE = 1 << 13,
CPUID_FEAT_EDX_MCA = 1 << 14,
CPUID_FEAT_EDX_CMOV = 1 << 15,
CPUID_FEAT_EDX_PAT = 1 << 16,
CPUID_FEAT_EDX_PSE36 = 1 << 17,
CPUID_FEAT_EDX_PSN = 1 << 18,
CPUID_FEAT_EDX_CLF = 1 << 19,
CPUID_FEAT_EDX_DTES = 1 << 21,
CPUID_FEAT_EDX_ACPI = 1 << 22,
CPUID_FEAT_EDX_MMX = 1 << 23,
CPUID_FEAT_EDX_FXSR = 1 << 24,
CPUID_FEAT_EDX_SSE = 1 << 25,
CPUID_FEAT_EDX_SSE2 = 1 << 26,
CPUID_FEAT_EDX_SS = 1 << 27,
CPUID_FEAT_EDX_HTT = 1 << 28,
CPUID_FEAT_EDX_TM1 = 1 << 29,
CPUID_FEAT_EDX_IA64 = 1 << 30,
CPUID_FEAT_EDX_PBE = 1 << 31
};
typedef enum cputype {
CT_NONE,
......@@ -154,7 +193,7 @@ bool cpuid_is_supported(void);
* Returns the highest extended function supported.
*
* This is the same as calling:
* cpuid(CPU_HIGHEST_EEXTENDED_FUNCTION_SUPPORTED, &highest);
* cpuid(CPUID_HIGHEST_EEXTENDED_FUNCTION_SUPPORTED, &highest);
*
* This is made visible to the linker because it's easier to call it
* instead of calling cpuid with less type-checking. cpuid calls this.
......@@ -169,23 +208,23 @@ uint32_t cpuid_highest_ext_func_supported(void);
* This function expects buf to be a valid pointer to a string/int/...
* depending on the requested information.
*
* For CPU_VENDOR_ID:
* For CPUID_VENDOR_ID:
* Returns a string into buf.
*
* For CPU_PROCINFO_AND_FEATUREBITS:
* buf[0]:
* - 3:0 - Stepping
* - 7:4 - Model
* - 11:8 - Family
* - 13:12 - Processor Type
* - 19:16 - Extended Model
* - 27:20 - Extended family
* buf[1] and buf[2]:
* For CPUID_PROCINFO_AND_FEATUREBITS:
* buf[0]: Stepping
* buf[1]: Model
* buf[2]: Family
* buf[3]: Extended Model
* buf[4]: Extended Family
* buf[5] and buf[6]:
* Feature flags
* buf[3]:
* Additional feature information.
* buf[7]: Brand Index
* buf[8]: CL Flush Line Size
* buf[9]: Logical Processors
* buf[10]: Initial APICID
*
* For CPU_L1_CACHE_AND_TLB_IDS:
* For CPUID_L1_CACHE_AND_TLB_IDS:
* buf[0]: (eax):
* - 7..0 Number of times to exec cpuid to get all descriptors.
* - 15..8 Instruction TLB: 4K Pages, 4-way set associtive, 128 entries.
......@@ -202,22 +241,22 @@ uint32_t cpuid_highest_ext_func_supported(void);
* - 16..23 Data TLB: 4M Pages, 4-way set associtive, 8 entires.
* - 24..31 1st-level data cache: 32K, 8-way set associtive, 64 byte line size
*
* For CPU_HIGHEST_EXTENDED_FUNCTION_SUPPORTED:
* For CPUID_HIGHEST_EXTENDED_FUNCTION_SUPPORTED:
* Returns the highest supported function in *buf (expects an integer ofc)
*
* For CPU_EXTENDED_PROC_INFO_FEATURE_BITS:
* For CPUID_EXTENDED_PROC_INFO_FEATURE_BITS:
* Returns them in buf[0] and buf[1].
*
* For CPU_EXTENDED_L2_CACHE_FEATURES:
* For CPUID_EXTENDED_L2_CACHE_FEATURES:
* buf[0]: Line size
* buf[1]: Associativity
* buf[2]: Cache size.
*
* For CPU_VIRT_PHYS_ADDR_SIZES:
* For CPUID_VIRT_PHYS_ADDR_SIZES:
* buf[0]: Physical
* buf[1]: Virtual
*
* For CPU_PROC_BRAND_STRING:
* For CPUID_PROC_BRAND_STRING:
* Have a char array with at least 48 bytes assigned to it.
*
* Here's a page which will help you parse the data provided by this function.
......@@ -232,8 +271,8 @@ void cpuid(cpuid_t info, uint32_t *buf);
*
* Returns true if feature is supported, false otherwise.
*
* The feature parameter must be >= CPU_EXTENDED_PROC_INFO_FEATURE_BITS
* and <= CPU_VIRT_PHYS_ADDR_SIZES.
* The feature parameter must be >= CPUID_EXTENDED_PROC_INFO_FEATURE_BITS
* and <= CPUID_VIRT_PHYS_ADDR_SIZES.
*/
bool cpuid_test_feature(cpuid_t feature);
......@@ -241,27 +280,13 @@ bool cpuid_test_feature(cpuid_t feature);
* cpuid_has_feature - Test if @feature is supported
*
* Test if the CPU supports MMX/SSE* etc.
* For the extended parameter, usually you want to pass it as
* false if you're not passing CEF_*.
*
* For more information about the CPU extended features, have a look
* at:
* http://en.wikipedia.org/wiki/CPUID
* Use cpuid_has_ecxfeature() for *_ECX* features and
* cpuid_has_edxfeature() for *_EDX* features.
*
* Returns true if the feature is available, false otherwise.
*/
#define cpuid_has_mmx() cpuid_has_feature(CF_MMX, false)
#define cpuid_has_sse() cpuid_has_feature(CF_SSE, false)
#define cpuid_has_sse2() cpuid_has_feature(CF_SSE2, false)
#define cpuid_has_sse3() cpuid_has_feature(CF_SSE3, false)
#define cpuid_has_ssse3() cpuid_has_feature(CF_SSSE3, false)
#define cpuid_has_avx() cpuid_has_feature(CF_AVX, false)
#define cpuid_has_fma() cpuid_has_feature(CF_FMA, false)
#define cpuid_has_x64() cpuid_has_feature(CEF_x64, true)
#define cpuid_has_sse4a() cpuid_has_feature(CEF_SSE4a, true)
#define cpuid_has_fma4() cpuid_has_feature(CEF_FMA4, true)
#define cpuid_has_xop() cpuid_has_feature(CEF_XOP, true)
bool cpuid_has_feature(int feature, bool extended);
bool cpuid_has_ecxfeature(int feature);
bool cpuid_has_edxfeature(int feature);
#else
#include <ccan/build_assert/build_assert.h>
......
ccan/cpuid/test/run.c
View file @ 004098ab
......@@ -15,21 +15,28 @@ int main(void)
printf ("Vendor ID: %s\n", cputype);
char buf[48];
cpuid(CPU_PROC_BRAND_STRING, (uint32_t *)buf);
cpuid(CPUID_PROC_BRAND_STRING, (uint32_t *)buf);
printf ("Processor Brand: %s\n", buf);
uint32_t procinfo[11];
cpuid(CPUID_PROCINFO_AND_FEATUREBITS, procinfo);
printf("Stepping: %d Model: 0x%X Family: %d extended model: %d extended family: %d\n",
procinfo[0], procinfo[1], procinfo[2], procinfo[3], procinfo[4]);
printf("Brand Index: %d CL Flush Line Size: %d Logical Processors: %d Initial APICID: %d\n",
procinfo[7], procinfo[8], procinfo[9], procinfo[10]);
printf ("Highest extended function supported: %#010x\n", cpuid_highest_ext_func_supported());
uint32_t phys_virt[2];
cpuid(CPU_VIRT_PHYS_ADDR_SIZES, phys_virt);
cpuid(CPUID_VIRT_PHYS_ADDR_SIZES, phys_virt);
printf ("Physical address size: %d\nVirtual address size: %d\n", phys_virt[0], phys_virt[1]);
uint32_t extfeatures[2];
cpuid(CPU_EXTENDED_PROC_INFO_FEATURE_BITS, extfeatures);
cpuid(CPUID_EXTENDED_PROC_INFO_FEATURE_BITS, extfeatures);
printf ("Extended processor info and feature bits: %d %d\n", extfeatures[0], extfeatures[1]);
uint32_t l2c[3];
cpuid(CPU_EXTENDED_L2_CACHE_FEATURES, l2c);
cpuid(CPUID_EXTENDED_L2_CACHE_FEATURES, l2c);
printf("L2 Line size: %u bytes\tAssociativity: %02xh\tCache Size: %u KB\n",
l2c[0], l2c[1], l2c[2]);
......
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