Moved the MdePkg to OldMdePkg so that new code in MdePkg does not break existing...

[mirror_edk2.git] / OldMdePkg / Library / BaseLib / X64 / CpuId.S

diff --git a/OldMdePkg/Library/BaseLib/X64/CpuId.S b/OldMdePkg/Library/BaseLib/X64/CpuId.S
new file mode 100644 (file)
index 0000000..98d7faa
--- /dev/null
+++ b/OldMdePkg/Library/BaseLib/X64/CpuId.S
@@ -0,0 +1,60 @@
+#------------------------------------------------------------------------------
+#
+# Copyright (c) 2006, Intel Corporation
+# All rights reserved. This program and the accompanying materials
+# are licensed and made available under the terms and conditions of the BSD License
+# which accompanies this distribution.  The full text of the license may be found at
+# http://opensource.org/licenses/bsd-license.php
+#
+# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+#
+# Module Name:
+#
+#   CpuId.S
+#
+# Abstract:
+#
+#   AsmCpuid function
+#
+# Notes:
+#
+#------------------------------------------------------------------------------
+
+#------------------------------------------------------------------------------
+#  VOID
+#  EFIAPI
+#  AsmCpuid (
+#    IN   UINT32  RegisterInEax,
+#    OUT  UINT32  *RegisterOutEax  OPTIONAL,
+#    OUT  UINT32  *RegisterOutEbx  OPTIONAL,
+#    OUT  UINT32  *RegisterOutEcx  OPTIONAL,
+#    OUT  UINT32  *RegisterOutEdx  OPTIONAL
+#    )
+#------------------------------------------------------------------------------
+.global _AsmCpuid;
+_AsmCpuid:
+    push    %rbx
+    mov     %ecx, %eax
+    push    %rax                         # save Index on stack
+    push    %rdx
+    cpuid
+    test    %r9, %r9
+    jz      L1
+    mov     %ecx, (%r9)
+L1:
+    pop     %rcx
+    jrcxz   L2
+    mov     %eax, (%rcx)
+L2:
+    mov     %r8, %rcx
+    jrcxz   L3
+    mov     %ebx, (%rcx)
+L3:
+    mov     0x38(%rsp), %rcx
+    jrcxz   L4
+    mov     %edx, (%rcx)
+L4:
+    pop     %rax                         # restore Index to rax as return value
+    pop     %rbx
+    ret