From 989322c384b180520803654acb69f53de83e45d6 Mon Sep 17 00:00:00 2001
From: qhuang8 <qhuang8@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Wed, 25 Nov 2009 04:25:02 +0000
Subject: Introduce UefiCpuLib library class in UefiCpuPkg and add one instance
 of BaseUefiCpuLib. The major purpose of this library class / instance is to
 provide some routines that are generic for IA32 family CPU

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@9480 6f19259b-4bc3-4df7-8a09-765794883524
---
 .../Library/BaseUefiCpuLib/X64/InitializeFpu.S     | 54 ++++++++++++++++++++
 .../Library/BaseUefiCpuLib/X64/InitializeFpu.asm   | 59 ++++++++++++++++++++++
 2 files changed, 113 insertions(+)
 create mode 100644 UefiCpuPkg/Library/BaseUefiCpuLib/X64/InitializeFpu.S
 create mode 100644 UefiCpuPkg/Library/BaseUefiCpuLib/X64/InitializeFpu.asm

(limited to 'UefiCpuPkg/Library/BaseUefiCpuLib/X64')

diff --git a/UefiCpuPkg/Library/BaseUefiCpuLib/X64/InitializeFpu.S b/UefiCpuPkg/Library/BaseUefiCpuLib/X64/InitializeFpu.S
new file mode 100644
index 0000000000..3d1556daa2
--- /dev/null
+++ b/UefiCpuPkg/Library/BaseUefiCpuLib/X64/InitializeFpu.S
@@ -0,0 +1,54 @@
+#------------------------------------------------------------------------------
+#*
+#*   Copyright 2009, 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.
+#*
+#*
+#------------------------------------------------------------------------------
+
+
+#
+# Float control word initial value: 
+# all exceptions masked, double-precision, round-to-nearest
+#
+ASM_PFX(mFpuControlWord): .word     0x027F
+#
+# Multimedia-extensions control word:
+# all exceptions masked, round-to-nearest, flush to zero for masked underflow
+#
+ASM_PFX(mMmxControlWord): .long     0x01F80
+
+#
+# Initializes floating point units for requirement of UEFI specification.
+#
+# This function initializes floating-point control word to 0x027F (all exceptions
+# masked,double-precision, round-to-nearest) and multimedia-extensions control word
+# (if supported) to 0x1F80 (all exceptions masked, round-to-nearest, flush to zero
+# for masked underflow).
+#
+ASM_GLOBAL ASM_PFX(InitializeFloatingPointUnits)
+ASM_PFX(InitializeFloatingPointUnits):
+
+    #
+    # Initialize floating point units
+    #
+    finit
+    fldcw   ASM_PFX(mFpuControlWord)
+    
+    #
+    # Set OSFXSR bit 9 in CR4
+    #
+    movq    %cr4, %rax 
+    or      $200, %rax
+    movq    %rax, %cr4
+    
+    ldmxcsr ASM_PFX(mMmxControlWord)
+    
+    ret
+
diff --git a/UefiCpuPkg/Library/BaseUefiCpuLib/X64/InitializeFpu.asm b/UefiCpuPkg/Library/BaseUefiCpuLib/X64/InitializeFpu.asm
new file mode 100644
index 0000000000..34c6de6f53
--- /dev/null
+++ b/UefiCpuPkg/Library/BaseUefiCpuLib/X64/InitializeFpu.asm
@@ -0,0 +1,59 @@
+;------------------------------------------------------------------------------
+;*
+;*   Copyright 2009, 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.
+;*
+;*
+;------------------------------------------------------------------------------
+
+
+.const
+;
+; Float control word initial value: 
+; all exceptions masked, double-precision, round-to-nearest
+;
+mFpuControlWord       DW      027Fh
+;
+; Multimedia-extensions control word:
+; all exceptions masked, round-to-nearest, flush to zero for masked underflow
+;
+mMmxControlWord       DD      01F80h 
+
+.code
+
+
+;
+; Initializes floating point units for requirement of UEFI specification.
+;
+; This function initializes floating-point control word to 0x027F (all exceptions
+; masked,double-precision, round-to-nearest) and multimedia-extensions control word
+; (if supported) to 0x1F80 (all exceptions masked, round-to-nearest, flush to zero
+; for masked underflow).
+;
+InitializeFloatingPointUnits PROC PUBLIC
+
+    ;
+    ; Initialize floating point units
+    ;
+    finit
+    fldcw   mFpuControlWord
+    
+    ;
+    ; Set OSFXSR bit 9 in CR4
+    ;
+    mov     rax, cr4
+    or      rax, BIT9
+    mov     cr4, rax
+
+    ldmxcsr mMmxControlWord
+    
+    ret
+InitializeFloatingPointUnits ENDP
+
+END
-- 
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