Intel 253666-024US - Manual (Page 233)

Vol. 2A 3-187
INSTRUCTION SET REFERENCE, A-M
CPUID—CPU Identification
BREAK
EAX
=
4H:
EAX ← Deterministic Cache Parameters Leaf; (* See Table 3-12. *)
EBX ← Deterministic Cache Parameters Leaf;
ECX ← Deterministic Cache Parameters Leaf;
EDX ← Deterministic Cache Parameters Leaf;
BREAK;
EAX
=
5H:
EAX ← MONITOR/MWAIT Leaf; (* See Table 3-12. *)
EBX ← MONITOR/MWAIT Leaf;
ECX ← MONITOR/MWAIT Leaf;
EDX ← MONITOR/MWAIT Leaf;
BREAK;
EAX
= 6H:
EAX ← Thermal and Power Management Leaf; (* See Table 3-12. *)
EBX ← Thermal and Power Management Leaf;
ECX ← Thermal and Power Management Leaf;
EDX ← Thermal and Power Management Leaf;
BREAK;
EAX
= 7H or 8H or 9H:
EAX ← Reserved = 0;
EBX ← Reserved = 0;
ECX ← Reserved = 0;
EDX ← Reserved = 0;
BREAK;
EAX
=
AH:
EAX ← Architectural Performance Monitoring Leaf; (* See Table 3-12. *)
EBX ← Architectural Performance Monitoring Leaf;
ECX ← Architectural Performance Monitoring Leaf;
EDX ← Architectural Performance Monitoring Leaf;
BREAK;
EAX
= 80000000H:
EAX ← Highest extended function input value understood by CPUID;
EBX ← Reserved;
ECX ← Reserved;
EDX ← Reserved;
BREAK;
EAX
= 80000001H:
EAX ← Reserved;
EBX ← Reserved;
ECX ← Extended Feature Bits (* See Table 3-12.*);
EDX ← Extended Feature Bits (* See Table 3-12. *);
BREAK;