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| author | Michael Kinney <michael.d.kinney@intel.com> | 2015-04-27 19:53:36 +0000 |
|---|---|---|
| committer | mdkinney <mdkinney@Edk2> | 2015-04-27 19:53:36 +0000 |
| commit | 5f72e68c9067ae5b8cfa7c935db81002cb22e00f (patch) | |
| tree | 7a99581054a5c319d0dc856b6a98c7a40493d93b /SourceLevelDebugPkg/Library/DebugAgent/DebugAgentCommon/X64/ArchDebugSupport.c | |
| parent | ef530fe71f47d7ae6fe12bfc60d876ea9ac25917 (diff) | |
| download | edk2-5f72e68c9067ae5b8cfa7c935db81002cb22e00f.tar.gz edk2-5f72e68c9067ae5b8cfa7c935db81002cb22e00f.tar.bz2 edk2-5f72e68c9067ae5b8cfa7c935db81002cb22e00f.zip | |
SourceLevelDebugPkg/DebugAgent: Support IA32 processors without DE or FXSAVE/FXRESTOR
Use CPUID Leaf 01 to detect support for debug extensions and FXSAVE/FXRESTOR instructions.
Do not enable those features in CR4 if they are not supported.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Michael Kinney <michael.d.kinney@intel.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17220 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'SourceLevelDebugPkg/Library/DebugAgent/DebugAgentCommon/X64/ArchDebugSupport.c')
| -rw-r--r-- | SourceLevelDebugPkg/Library/DebugAgent/DebugAgentCommon/X64/ArchDebugSupport.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/SourceLevelDebugPkg/Library/DebugAgent/DebugAgentCommon/X64/ArchDebugSupport.c b/SourceLevelDebugPkg/Library/DebugAgent/DebugAgentCommon/X64/ArchDebugSupport.c index 60d3eb8bb3..08cef0154f 100644 --- a/SourceLevelDebugPkg/Library/DebugAgent/DebugAgentCommon/X64/ArchDebugSupport.c +++ b/SourceLevelDebugPkg/Library/DebugAgent/DebugAgentCommon/X64/ArchDebugSupport.c @@ -1,7 +1,7 @@ /** @file
Supporting functions for X64 architecture.
- Copyright (c) 2010 - 2013, Intel Corporation. All rights reserved.<BR>
+ Copyright (c) 2010 - 2015, Intel Corporation. All rights reserved.<BR>
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
@@ -28,6 +28,7 @@ InitializeDebugIdt ( IA32_DESCRIPTOR IdtDescriptor;
UINTN Index;
UINT16 CodeSegment;
+ UINT32 RegEdx;
AsmReadIdtr (&IdtDescriptor);
@@ -61,9 +62,13 @@ InitializeDebugIdt ( IdtEntry[DEBUG_TIMER_VECTOR].Bits.GateType = IA32_IDT_GATE_TYPE_INTERRUPT_32;
//
+ // If the CPU supports Debug Extensions(CPUID:01 EDX:BIT2), then
// Set DE flag in CR4 to enable IO breakpoint
//
- AsmWriteCr4 (AsmReadCr4 () | BIT3);
+ AsmCpuid (1, NULL, NULL, NULL, &RegEdx);
+ if ((RegEdx & BIT2) != 0) {
+ AsmWriteCr4 (AsmReadCr4 () | BIT3);
+ }
}
/**
|