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authorJiyoung Yun <jy910.yun@samsung.com>2016-12-27 16:46:08 +0900
committerJiyoung Yun <jy910.yun@samsung.com>2016-12-27 16:46:08 +0900
commitdb20f3f1bb8595633a7e16c8900fd401a453a6b5 (patch)
treee5435159cd1bf0519276363a6fe1663d1721bed3 /src/pal/src/arch/amd64/processor.cpp
parent4b4aad7217d3292650e77eec2cf4c198ea9c3b4b (diff)
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Imported Upstream version 1.0.0.9127upstream/1.0.0.9127
Diffstat (limited to 'src/pal/src/arch/amd64/processor.cpp')
-rw-r--r--src/pal/src/arch/amd64/processor.cpp64
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diff --git a/src/pal/src/arch/amd64/processor.cpp b/src/pal/src/arch/amd64/processor.cpp
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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+/*++
+
+
+
+Module Name:
+
+ processor.cpp
+
+Abstract:
+
+ Implementation of processor related functions for the Intel x86/x64
+ platforms. These functions are processor dependent.
+
+
+
+--*/
+
+#include "pal/palinternal.h"
+
+/*++
+Function:
+YieldProcessor
+
+The YieldProcessor function signals to the processor to give resources
+to threads that are waiting for them. This macro is only effective on
+processors that support technology allowing multiple threads running
+on a single processor, such as Intel's Hyper-Threading technology.
+
+--*/
+void
+PALAPI
+YieldProcessor(
+ VOID)
+{
+ __asm__ __volatile__ (
+ "rep\n"
+ "nop"
+ );
+}
+
+/*++
+Function:
+XmmYmmStateSupport
+
+Check if OS has enabled both XMM and YMM state support
+
+Return value:
+1 if XMM and YMM are enabled, 0 otherwise
+--*/
+extern "C" unsigned int XmmYmmStateSupport()
+{
+ unsigned int eax;
+ __asm(" xgetbv\n" \
+ : "=a"(eax) /*output in eax*/\
+ : "c"(0) /*inputs - 0 in ecx*/\
+ : "eax", "edx" /* registers that are clobbered*/
+ );
+ // Check OS has enabled both XMM and YMM state support
+ return ((eax & 0x06) == 0x06) ? 1 : 0;
+}