diff options
| author | vanjeff <vanjeff@6f19259b-4bc3-4df7-8a09-765794883524> | 2008-12-11 05:28:12 +0000 |
|---|---|---|
| committer | vanjeff <vanjeff@6f19259b-4bc3-4df7-8a09-765794883524> | 2008-12-11 05:28:12 +0000 |
| commit | 6e8a984eca4c9763038e887b8d813b2110bbaed6 (patch) | |
| tree | b418c1c4d5e8981e00c5b27717039758680e6935 /MdeModulePkg/Universal/DebugSupportDxe/X64/PlDebugSupportX64.c | |
| parent | 4ef55dfc766c2206378ab7e5a3101a2a7a32d569 (diff) | |
| download | edk2-platforms-6e8a984eca4c9763038e887b8d813b2110bbaed6.tar.xz | |
1. Merger generic functions into one file.
2. Use the basic definitions in BaseLib.h, instead of local definitions
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@6986 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'MdeModulePkg/Universal/DebugSupportDxe/X64/PlDebugSupportX64.c')
| -rw-r--r-- | MdeModulePkg/Universal/DebugSupportDxe/X64/PlDebugSupportX64.c | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/MdeModulePkg/Universal/DebugSupportDxe/X64/PlDebugSupportX64.c b/MdeModulePkg/Universal/DebugSupportDxe/X64/PlDebugSupportX64.c new file mode 100644 index 0000000000..943d2c6911 --- /dev/null +++ b/MdeModulePkg/Universal/DebugSupportDxe/X64/PlDebugSupportX64.c @@ -0,0 +1,143 @@ +/** @file
+ X64 specific debug support functions
+
+Copyright (c) 2006 - 2007, 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.
+
+**/
+
+//
+// private header files
+//
+#include "DebugSupport.h"
+
+/**
+ Get Procedure Entry Point from IDT Gate Descriptor.
+
+ @param IdtGateDecriptor IDT Gate Descriptor.
+
+ @return Procedure Entry Point located in IDT Gate Descriptor.
+
+**/
+UINTN GetProcedureEntryPoint (
+ IN IA32_IDT_GATE_DESCRIPTOR *IdtGateDecriptor
+ )
+{
+ UINTN ProcedureEntryPoint;
+
+ ((UINT16 *) &ProcedureEntryPoint)[0] = (UINT16) IdtGateDecriptor->Bits.OffsetLow;
+ ((UINT16 *) &ProcedureEntryPoint)[1] = (UINT16) IdtGateDecriptor->Bits.OffsetHigh;
+ ((UINT32 *) &ProcedureEntryPoint)[1] = (UINT32) IdtGateDecriptor->Bits.OffsetUpper;
+
+ return ProcedureEntryPoint;
+}
+
+/**
+ Allocate pool for a new IDT entry stub.
+
+ Copy the generic stub into the new buffer and fixup the vector number
+ and jump target address.
+
+ @param ExceptionType This is the exception type that the new stub will be created
+ for.
+ @param Stub On successful exit, *Stub contains the newly allocated entry stub.
+
+ @retval EFI_SUCCESS Always.
+
+**/
+EFI_STATUS
+CreateEntryStub (
+ IN EFI_EXCEPTION_TYPE ExceptionType,
+ OUT VOID **Stub
+ )
+{
+ UINT8 *StubCopy;
+
+ StubCopy = *Stub;
+
+ //
+ // Fixup the stub code for this vector
+ //
+
+ // The stub code looks like this:
+ //
+ // 00000000 6A 00 push 0 ; push vector number - will be modified before installed
+ // 00000002 E9 db 0e9h ; jump rel32
+ // 00000003 00000000 dd 0 ; fixed up to relative address of CommonIdtEntry
+ //
+
+ //
+ // poke in the exception type so the second push pushes the exception type
+ //
+ StubCopy[0x1] = (UINT8) ExceptionType;
+
+ //
+ // fixup the jump target to point to the common entry
+ //
+ *(UINT32 *) &StubCopy[0x3] = (UINT32)((UINTN) CommonIdtEntry - (UINTN) &StubCopy[StubSize]);
+
+ return EFI_SUCCESS;
+}
+
+/**
+ This is the main worker function that manages the state of the interrupt
+ handlers. It both installs and uninstalls interrupt handlers based on the
+ value of NewCallback. If NewCallback is NULL, then uninstall is indicated.
+ If NewCallback is non-NULL, then install is indicated.
+
+ @param NewCallback If non-NULL, NewCallback specifies the new handler to register.
+ If NULL, specifies that the previously registered handler should
+ be uninstalled.
+ @param ExceptionType Indicates which entry to manage.
+
+ @retval EFI_SUCCESS Process is ok.
+ @retval EFI_INVALID_PARAMETER Requested uninstalling a handler from a vector that has
+ no handler registered for it
+ @retval EFI_ALREADY_STARTED Requested install to a vector that already has a handler registered.
+ @retval others Possible return values are passed through from UnHookEntry and HookEntry.
+
+**/
+EFI_STATUS
+ManageIdtEntryTable (
+ VOID (*NewCallback)(),
+ EFI_EXCEPTION_TYPE ExceptionType
+ )
+{
+ EFI_STATUS Status;
+
+ Status = EFI_SUCCESS;
+
+ if (CompareMem (&IdtEntryTable[ExceptionType].NewDesc, &NullDesc, sizeof (IA32_IDT_GATE_DESCRIPTOR)) != 0) {
+ //
+ // we've already installed to this vector
+ //
+ if (NewCallback != NULL) {
+ //
+ // if the input handler is non-null, error
+ //
+ Status = EFI_ALREADY_STARTED;
+ } else {
+ Status = UnhookEntry (ExceptionType);
+ }
+ } else {
+ //
+ // no user handler installed on this vector
+ //
+ if (NewCallback == NULL) {
+ //
+ // if the input handler is null, error
+ //
+ Status = EFI_INVALID_PARAMETER;
+ } else {
+ Status = HookEntry (ExceptionType, NewCallback);
+ }
+ }
+
+ return Status;
+}
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