102 lines
2.3 KiB
C
102 lines
2.3 KiB
C
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/*++
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Copyright (c) 1998 Intel Corporation
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Module Name:
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vm.c
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Abstract:
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Very hard to remap runtime address into the new virual address space
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that was registered by the OS for RT calls.
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So the code image needs to be relocated. All pointers need to be
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manually fixed up since the address map changes.
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GOOD LUCK NOT HAVING BUGS IN YOUR CODE! PLEASE TEST A LOT. MAKE SURE
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EXIT BOOTSERVICES OVER WRITES ALL BOOTSERVICE MEMORY & DATA SPACES WHEN
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YOU TEST.
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Revision History
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--*/
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#include "lib.h"
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#pragma RUNTIME_CODE(RtLibEnableVirtualMappings)
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VOID
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RUNTIMEFUNCTION
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RtLibEnableVirtualMappings (
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VOID
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)
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{
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EFI_CONVERT_POINTER ConvertPointer;
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/*
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* If this copy of the lib is linked into the firmware, then
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* do not update the pointers yet.
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*/
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if (!LibFwInstance) {
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/*
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* Different components are updating to the new virtual
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* mappings at differnt times. The only function that
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* is safe to call at this notification is ConvertAddress
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*/
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ConvertPointer = RT->ConvertPointer;
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/*
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* Fix any pointers that the lib created, that may be needed
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* during runtime.
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*/
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ConvertPointer (EFI_INTERNAL_PTR, (VOID **)&RT);
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ConvertPointer (EFI_OPTIONAL_PTR, (VOID **)&LibRuntimeDebugOut);
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ConvertPointer (EFI_INTERNAL_PTR, (VOID **)&LibRuntimeRaiseTPL);
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ConvertPointer (EFI_INTERNAL_PTR, (VOID **)&LibRuntimeRestoreTPL);
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/* that was it :^) */
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}
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}
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#pragma RUNTIME_CODE(RtConvertList)
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VOID
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RUNTIMEFUNCTION
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RtConvertList (
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IN UINTN DebugDisposition,
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IN OUT LIST_ENTRY *ListHead
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)
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{
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LIST_ENTRY *Link;
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LIST_ENTRY *NextLink;
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EFI_CONVERT_POINTER ConvertPointer;
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ConvertPointer = RT->ConvertPointer;
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/*
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* Convert all the Flink & Blink pointers in the list
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*/
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Link = ListHead;
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do {
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NextLink = Link->Flink;
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ConvertPointer (
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Link->Flink == ListHead ? DebugDisposition : 0,
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(VOID **)&Link->Flink
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);
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ConvertPointer (
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Link->Blink == ListHead ? DebugDisposition : 0,
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(VOID **)&Link->Blink
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);
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Link = NextLink;
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} while (Link != ListHead);
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}
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