ba05ea83b7
Add the Memory Debug Logging feature MemDebugLogLib library which provides the key MemDebugLogWrite() function. Several versions (i.e. SEC, PEIM, DXE, runtime) of the function are included to provide the proper method to write the debug messages to the memory debug log buffer. The library also provides the core functions to maintain the circular memory debug log buffer. Cc: Gerd Hoffmann <kraxel@redhat.com> Cc: Ard Biesheuvel <ardb+tianocore@kernel.org> Cc: Jiewen Yao <jiewen.yao@intel.com> Signed-off-by: Aaron Young <aaron.young@oracle.com>
55 lines
1.1 KiB
C
55 lines
1.1 KiB
C
/** @file
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*
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Memory Debug Log Library - Runtime
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Copyright (C) 2025, Oracle and/or its affiliates.
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <PiDxe.h>
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#include <Library/MemDebugLogLib.h>
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#include <Library/UefiRuntimeLib.h>
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EFI_PHYSICAL_ADDRESS mMemDebugLogBufAddr;
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BOOLEAN mMemDebugLogBufAddrInit;
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EFI_STATUS
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EFIAPI
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MemDebugLogWrite (
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IN CHAR8 *Buffer,
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IN UINTN Length
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)
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{
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EFI_STATUS Status;
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//
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// Stop logging after we have switched to virtual mode
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// to avoid potential problems (such as crashes accessing
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// physical pointers).
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//
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if (EfiGoneVirtual ()) {
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return EFI_SUCCESS;
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}
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if (!mMemDebugLogBufAddrInit) {
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//
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// Obtain the Memory Debug Log buffer addr from HOB
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//
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Status = MemDebugLogAddrFromHOB (&mMemDebugLogBufAddr);
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if (EFI_ERROR (Status)) {
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mMemDebugLogBufAddr = 0;
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}
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mMemDebugLogBufAddrInit = TRUE;
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}
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if (mMemDebugLogBufAddr) {
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Status = MemDebugLogWriteBuffer (mMemDebugLogBufAddr, Buffer, Length);
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} else {
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Status = EFI_NOT_FOUND;
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}
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return Status;
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}
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