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Optimize CPU detection code

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This commit is contained in:
Stas Degteff 2005-10-15 22:58:39 +00:00
parent 34c300f44c
commit 0c149cd68a
1 changed files with 45 additions and 51 deletions
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92
goldlib/gall/gutlvers.cpp
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@ -49,19 +49,7 @@
// ------------------------------------------------------------------
struct gcpu_info
{
char v_name[_MAX_VNAME_LEN+1]; // vendor name
char m_name[_MAX_MNAME_LEN+1]; // model name
unsigned family;
unsigned model;
unsigned stepping;
};
// ------------------------------------------------------------------
static bool HaveCPUID()
inline static bool HaveCPUID()
{
// TO_PORT_TAG: CPUID
#if defined(_MSC_VER)
@ -240,59 +228,67 @@ static void cpuname(int family, int model, const char *v_name, char *m_name)
// ------------------------------------------------------------------
void gcpuid(gcpu_info *pinfo)
char *gcpuid(char *_cpuname)
{
static struct { /* used in asm code in gcpuid() */
unsigned cpu; /* x86, where x=cpu */
unsigned cpu_high; /* highest CPUID capability */
char vendor[3*sizeof(dword)+1]; /* CPU vendor string 12 bytes, 13th byte is zero */
char family; /* CPU stepping number, 4 bits */
char model; /* CPU model number, 4 bits */
char stepping; /* CPU stepping value, 4 bits */
// unsigned cpu_id; /* stepping ID, 12 bits: 0x0FMS */
// unsigned features; /* CPU features info */
}scpuid; /* ISO C: static variabled is initialised with 0 */
// TO_PORT_TAG: CPUID
static struct scpuid_t{
dword cpu; /* x86, where x=cpu */
dword cpu_high; /* highest CPUID capability */
#if defined(_MSC_VER)
union
{
char buff[_MAX_VNAME_LEN];
char vendor[_MAX_VNAME_LEN+1];
struct
{
dword dw0;
dword dw1;
dword dw2;
} dw;
} vendor;
};
#else
char vendor[3*sizeof(dword)+1]; /* CPU vendor string 12 bytes, 13th byte is zero */
#endif
unsigned char family; /* CPU stepping number, 4 bits */
unsigned char model; /* CPU model number, 4 bits */
unsigned char stepping; /* CPU stepping value, 4 bits */
// unsigned cpu_id; /* stepping ID, 12 bits: 0x0FMS */
// unsigned features; /* CPU features info */
}scpuid;
dword standard = 0;
vendor.buff[_MAX_VNAME_LEN-1] = 0;
// memset( &scpuid, 0, sizeof(scpuid) );
// TO_PORT_TAG: CPUID
#if defined(_MSC_VER)
scpuid.vendor[_MAX_VNAME_LEN] = 0;
#undef and
__asm
{
// get the vendor string
xor eax, eax
cpuid
mov vendor.dw.dw0, ebx
mov vendor.dw.dw1, edx
mov vendor.dw.dw2, ecx
// mov scpuid.cpu_high, eax
mov scpuid.dw.dw0, ebx
mov scpuid.dw.dw1, edx
mov scpuid.dw.dw2, ecx
// get the standard bits
// get the CPU family, model, stepping, features bits
mov eax, 1
cpuid
mov standard, eax
// mov scpuid.features, edx
mov bx, ax
and ax, 0x0F0F // 3855 // 0x0F0F
mov scpuid.stepping, al
mov scpuid.family, ah
shr bl, 4
mov scpuid.model,bl
}
pinfo->family = (standard >> 8) & 0xF; // extracts family
pinfo->model = (standard >> 4) & 0xF; // extracts model
pinfo->stepping = standard & 0xF; // extracts stepping
#define and &&
strncpy(pinfo->v_name, vendor.buff, _MAX_VNAME_LEN);
cpuname(pinfo->family, pinfo->model, pinfo->v_name, pinfo->m_name);
cpuname( scpuid.family, scpuid.model, scpuid.vendor, _cpuname);
#elif defined(__GNUC__)
@ -330,7 +326,7 @@ void gcpuid(gcpu_info *pinfo)
"nexgen:"
"popfl\n\t"
"movl $12,%0\n\t" /* CPU NX586 */
"movl $5,%0\n\t" /* CPU NX586 */
"movl $0x4778654e,%1\n\t" /* store vendor string */
"movl $0x72446e65,%1+4\n\t" /* "NexGenDriven" */
"movl $0x6e657669,%1+8\n\t"
@ -436,13 +432,13 @@ void gcpuid(gcpu_info *pinfo)
"eax", "ebx", "ecx", "edx", "esp"
);
cpuname(scpuid.family, scpuid.model, scpuid.vendor, pinfo->m_name);
cpuname(scpuid.family, scpuid.model, scpuid.vendor, _cpuname);
#else
strcpy(vendor.buff, "UNKNOUN_CPU!");
cpuname(0, 0, "UNKNOUN_CPU!", pinfo->m_name);
cpuname(0, 0, "UNKNOWN ", _cpuname);
#endif
return _cpuname;
}
@ -503,9 +499,7 @@ char* ggetosstring(void) {
{
if (HaveCPUID())
{
gcpu_info pinfo;
gcpuid(&pinfo);
strcpy(processor, pinfo.m_name);
gcpuid(processor);
}
else
{