84 lines
2.0 KiB
C
84 lines
2.0 KiB
C
/**
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NVRAM debug stuff.
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by dmazar
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**/
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#include <Library/UefiLib.h>
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#include <Library/UefiRuntimeServicesTableLib.h>
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#include <Library/DebugLib.h>
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#include <Library/PrintLib.h>
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#include "NVRAMDebug.h"
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// DBG_TO: 0=no debug, 1=serial, 2=console
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// serial requires
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// [PcdsFixedAtBuild]
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// gEfiMdePkgTokenSpaceGuid.PcdDebugPropertyMask|0x07
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// gEfiMdePkgTokenSpaceGuid.PcdDebugPrintErrorLevel|0xFFFFFFFF
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// in package DSC file
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#define DBG_TO 0
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#if DBG_TO == 2
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#define DBG(...) AsciiPrint(__VA_ARGS__);
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#elif DBG_TO == 1
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#define DBG(...) DebugPrint(1, __VA_ARGS__);
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#else
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#define DBG(...)
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#endif
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// NVRAM var guid.
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EFI_GUID gEfiNVRAMDebugVarGuid = DEBUG_LOG_NVRAM_VAR_GUID;
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// Debug log buffer.
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CHAR8 DebugLogBuffer[DEBUG_LOG_SIZE];
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// Pointer to the current end (beginning of a free space) of the log in the buffer.
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CHAR8 *DebugLogBufferPtr = NULL;
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/** Appends given data to the log and writes it to NVRAM variable. */
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EFI_STATUS EFIAPI
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NVRAMDebugLog(CHAR8 *Format, ...)
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{
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EFI_STATUS Status;
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VA_LIST Marker;
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UINTN DataSize;
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UINTN DataWritten;
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if (DebugLogBufferPtr == NULL) {
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// init pointer to the buffer start
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DebugLogBufferPtr = DebugLogBuffer;
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}
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DataSize = DEBUG_LOG_SIZE - (DebugLogBufferPtr - DebugLogBuffer);
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if (DataSize < 2) {
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return EFI_BUFFER_TOO_SMALL;
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}
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// add text to buffer
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VA_START (Marker, Format);
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DataWritten = AsciiVSPrint(DebugLogBufferPtr, DataSize, Format, Marker);
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VA_END (Marker);
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DebugLogBufferPtr += DataWritten;
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// delete prev value
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//Status = gRT->SetVariable(L"DebugLog", &gEfiNVRAMDebugVarGuid,
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// EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_NON_VOLATILE,
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// 0, DebugLogBuffer);
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// write new value
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Status = gRT->SetVariable(
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DEBUG_LOG_NVRAM_VAR_NAME,
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&gEfiNVRAMDebugVarGuid,
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EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_NON_VOLATILE,
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DebugLogBufferPtr - DebugLogBuffer,
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DebugLogBuffer
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);
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return Status;
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}
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