feat: add CPUID function

The CPUID function calls leaf with subleaf function and returns eax,
ebx, ecx and edx.

Signed-off-by: Christian Walter <christian.walter@9elements.com>

Author: walterchris

pkg/hwapi/cpuid_amd64.go

@@ -8,44 +8,50 @@ import "github.com/intel-go/cpuid"
 
 func cpuidLow(arg1, arg2 uint32) (eax, ebx, ecx, edx uint32) // implemented in cpuidlow_amd64.s
 
-//VersionString returns the vendor ID
+// VersionString returns the vendor ID
 func (h HwAPI) VersionString() string {
 	return cpuid.VendorIdentificatorString
 }
 
-//HasSMX returns true if SMX is supported
+// HasSMX returns true if SMX is supported
 func (h HwAPI) HasSMX() bool {
 	return cpuid.HasFeature(cpuid.SMX)
 }
 
-//HasVMX returns true if VMX is supported
+// HasVMX returns true if VMX is supported
 func (h HwAPI) HasVMX() bool {
 	return cpuid.HasFeature(cpuid.VMX)
 }
 
-//HasMTRR returns true if MTRR are supported
+// HasMTRR returns true if MTRR are supported
 func (h HwAPI) HasMTRR() bool {
 	return cpuid.HasFeature(cpuid.MTRR) || cpuid.HasExtraFeature(cpuid.MTRR_2)
 }
 
-//ProcessorBrandName returns the CPU brand name
+// ProcessorBrandName returns the CPU brand name
 func (h HwAPI) ProcessorBrandName() string {
 	return cpuid.ProcessorBrandString
 }
 
-//CPUSignature returns CPUID=1 eax
+// CPUSignature returns CPUID=1 eax
 func (h HwAPI) CPUSignature() uint32 {
 	eax, _, _, _ := h.CPUSignatureFull()
 	return eax
 }
 
-//CPUSignatureFull returns CPUID=1 eax, ebx, ecx, edx
+// CPUSignatureFull returns CPUID=1 eax, ebx, ecx, edx
 func (h HwAPI) CPUSignatureFull() (uint32, uint32, uint32, uint32) {
 	return cpuidLow(1, 0)
 }
 
-//CPULogCount returns number of logical CPU cores
+// CPULogCount returns number of logical CPU cores
 func (h HwAPI) CPULogCount() uint32 {
 	return 0
-	//return uint32(cpuid.MaxLogicalCPUId)
+	// return uint32(cpuid.MaxLogicalCPUId)
+}
+
+// CPUID executes the CPUID instruction with the given leaf (eax) and subleaf (ecx) values
+// Returns the resulting eax, ebx, ecx, and edx register values
+func (h HwAPI) CPUID(leaf, subleaf uint32) (eax, ebx, ecx, edx uint32) {
+	return cpuidLow(leaf, subleaf)
 }

pkg/hwapi/cpuid_other.go

@@ -4,42 +4,48 @@
 // Package hwapi provides access to low level hardware
 package hwapi
 
-//VersionString returns the vendor ID
+// VersionString returns the vendor ID
 func (h HwAPI) VersionString() string {
 	return "null"
 }
 
-//HasSMX returns true if SMX is supported
+// HasSMX returns true if SMX is supported
 func (h HwAPI) HasSMX() bool {
 	return false
 }
 
-//HasVMX returns true if VMX is supported
+// HasVMX returns true if VMX is supported
 func (h HwAPI) HasVMX() bool {
 	return false
 }
 
-//HasMTRR returns true if MTRR are supported
+// HasMTRR returns true if MTRR are supported
 func (h HwAPI) HasMTRR() bool {
 	return false
 }
 
-//ProcessorBrandName returns the CPU brand name
+// ProcessorBrandName returns the CPU brand name
 func (h HwAPI) ProcessorBrandName() string {
 	return "not intel"
 }
 
-//CPUSignature returns CPUID=1 eax
+// CPUSignature returns CPUID=1 eax
 func (h HwAPI) CPUSignature() uint32 {
 	return 0
 }
 
-//CPUSignatureFull returns CPUID=1 eax, ebx, ecx, edx
+// CPUSignatureFull returns CPUID=1 eax, ebx, ecx, edx
 func (h HwAPI) CPUSignatureFull() (uint32, uint32, uint32, uint32) {
 	return 0, 0, 0, 0
 }
 
-//CPULogCount returns number of logical CPU cores
+// CPULogCount returns number of logical CPU cores
 func (h HwAPI) CPULogCount() uint32 {
 	return 0
 }
+
+// CPUID executes the CPUID instruction with the given leaf (eax) and subleaf (ecx) values
+// Returns the resulting eax, ebx, ecx, and edx register values
+func (h HwAPI) CPUID(leaf, subleaf uint32) (eax, ebx, ecx, edx uint32) {
+	return 0, 0, 0, 0
+}