X-Git-Url: https://git.proxmox.com/?a=blobdiff_plain;f=MdePkg%2FLibrary%2FBaseLib%2FIa32%2FCpuId.c;h=6fbc5375bced4a509a1666e6ee79a52dc1455e18;hb=42eedea958591087603bbacd1c2227d2494026af;hp=73f12bcaeeb1938a79cd2a2cdd0727e0cdc0753b;hpb=0f82bd55142af193e669e76fcaf02f8d835f3f39;p=mirror_edk2.git

diff --git a/MdePkg/Library/BaseLib/Ia32/CpuId.c b/MdePkg/Library/BaseLib/Ia32/CpuId.c
index 73f12bcaee..6fbc5375bc 100644
--- a/MdePkg/Library/BaseLib/Ia32/CpuId.c
+++ b/MdePkg/Library/BaseLib/Ia32/CpuId.c
@@ -17,6 +17,31 @@
 //
 
 
+/**
+  Retrieves CPUID information.
+
+  Executes the CPUID instruction with EAX set to the value specified by Index.
+  This function always returns Index.
+  If Eax is not NULL, then the value of EAX after CPUID is returned in Eax.
+  If Ebx is not NULL, then the value of EBX after CPUID is returned in Ebx.
+  If Ecx is not NULL, then the value of ECX after CPUID is returned in Ecx.
+  If Edx is not NULL, then the value of EDX after CPUID is returned in Edx.
+  This function is only available on IA-32 and X64.
+
+  @param  Index The 32-bit value to load into EAX prior to invoking the CPUID
+                instruction.
+  @param  Eax   Pointer to the 32-bit EAX value returned by the CPUID
+                instruction. This is an optional parameter that may be NULL.
+  @param  Ebx   Pointer to the 32-bit EBX value returned by the CPUID
+                instruction. This is an optional parameter that may be NULL.
+  @param  Ecx   Pointer to the 32-bit ECX value returned by the CPUID
+                instruction. This is an optional parameter that may be NULL.
+  @param  Edx   Pointer to the 32-bit EDX value returned by the CPUID
+                instruction. This is an optional parameter that may be NULL.
+
+  @return Index
+
+**/
 UINT32
 EFIAPI
 AsmCpuid (