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383 lines
13 KiB
C
383 lines
13 KiB
C
/** @file
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Debug Print Error Level library instance that provide compatibility with the
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"err" shell command. This includes support for the Debug Mask Protocol
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supports for global debug print error level mask stored in an EFI Variable.
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This library instance only support DXE Phase modules.
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Copyright (c) 2011 - 2018, Intel Corporation. All rights reserved.<BR>
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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/DebugPrintErrorLevelLib.h>
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#include <Library/PcdLib.h>
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#include <Library/HobLib.h>
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#include <Guid/DebugMask.h>
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///
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/// Debug Mask Protocol function prototypes
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///
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/**
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Retrieves the current debug print error level mask for a module are returns
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it in CurrentDebugMask.
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@param This The protocol instance pointer.
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@param CurrentDebugMask Pointer to the debug print error level mask that
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is returned.
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@retval EFI_SUCCESS The current debug print error level mask was
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returned in CurrentDebugMask.
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@retval EFI_INVALID_PARAMETER CurrentDebugMask is NULL.
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@retval EFI_DEVICE_ERROR The current debug print error level mask could
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not be retrieved.
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**/
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EFI_STATUS
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EFIAPI
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GetDebugMask (
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IN EFI_DEBUG_MASK_PROTOCOL *This,
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IN OUT UINTN *CurrentDebugMask
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);
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/**
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Sets the current debug print error level mask for a module to the value
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specified by NewDebugMask.
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@param This The protocol instance pointer.
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@param NewDebugMask The new debug print error level mask for this module.
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@retval EFI_SUCCESS The current debug print error level mask was
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set to the value specified by NewDebugMask.
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@retval EFI_DEVICE_ERROR The current debug print error level mask could
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not be set to the value specified by NewDebugMask.
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**/
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EFI_STATUS
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EFIAPI
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SetDebugMask (
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IN EFI_DEBUG_MASK_PROTOCOL *This,
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IN UINTN NewDebugMask
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);
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///
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/// Debug Mask Protocol instance
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///
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EFI_DEBUG_MASK_PROTOCOL mDebugMaskProtocol = {
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EFI_DEBUG_MASK_REVISION,
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GetDebugMask,
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SetDebugMask
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};
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///
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/// Global variable that is set to TRUE after the first attempt is made to
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/// retrieve the global error level mask through the EFI Varibale Services.
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/// This variable prevents the EFI Variable Services from being called fort
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/// every DEBUG() macro.
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///
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BOOLEAN mGlobalErrorLevelInitialized = FALSE;
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///
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/// Global variable that contains the current debug error level mask for the
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/// module that is using this library instance. This variable is initially
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/// set to the PcdDebugPrintErrorLevel value. If the EFI Variable exists that
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/// contains the global debug print error level mask, then that overrides the
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/// PcdDebugPrintErrorLevel value. The EFI Variable can optionally be
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/// discovered via a HOB so early DXE drivers can access the variable. If the
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/// Debug Mask Protocol SetDebugMask() service is called, then that overrides
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/// the PcdDebugPrintErrorLevel and the EFI Variable setting.
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///
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UINT32 mDebugPrintErrorLevel = 0;
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///
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/// Global variable that is used to cache a pointer to the EFI System Table
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/// that is required to access the EFI Variable Services to get and set
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/// the global debug print error level mask value. The UefiBootServicesTableLib
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/// is not used to prevent a circular dependency between these libraries.
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///
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EFI_SYSTEM_TABLE *mSystemTable = NULL;
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/**
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The constructor function caches the PCI Express Base Address and creates a
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Set Virtual Address Map event to convert physical address to virtual addresses.
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@param ImageHandle The firmware allocated handle for the EFI image.
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@param SystemTable A pointer to the EFI System Table.
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@retval EFI_SUCCESS The constructor completed successfully.
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@retval Other value The constructor did not complete successfully.
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**/
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EFI_STATUS
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EFIAPI
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DxeDebugPrintErrorLevelLibConstructor (
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IN EFI_HANDLE ImageHandle,
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IN EFI_SYSTEM_TABLE *SystemTable
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)
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{
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EFI_STATUS Status;
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//
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// Initialize the error level mask from PCD setting.
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//
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mDebugPrintErrorLevel = PcdGet32 (PcdDebugPrintErrorLevel);
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//
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// Install Debug Mask Protocol onto ImageHandle
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//
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mSystemTable = SystemTable;
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Status = SystemTable->BootServices->InstallMultipleProtocolInterfaces (
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&ImageHandle,
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&gEfiDebugMaskProtocolGuid, &mDebugMaskProtocol,
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NULL
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);
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//
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// Attempt to retrieve the global debug print error level mask from the EFI Variable
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// If the EFI Variable can not be accessed when this module's library constructors are
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// executed a HOB can be used to set the global debug print error level. If no value
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// was found then the EFI Variable access will be reattempted on every DEBUG() print
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// from this module until the EFI Variable services are available.
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//
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GetDebugPrintErrorLevel ();
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return Status;
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}
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/**
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The destructor function frees any allocated buffers and closes the Set Virtual
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Address Map event.
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@param ImageHandle The firmware allocated handle for the EFI image.
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@param SystemTable A pointer to the EFI System Table.
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@retval EFI_SUCCESS The destructor completed successfully.
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@retval Other value The destructor did not complete successfully.
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**/
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EFI_STATUS
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EFIAPI
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DxeDebugPrintErrorLevelLibDestructor (
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IN EFI_HANDLE ImageHandle,
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IN EFI_SYSTEM_TABLE *SystemTable
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)
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{
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//
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// Uninstall the Debug Mask Protocol from ImageHandle
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//
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return SystemTable->BootServices->UninstallMultipleProtocolInterfaces (
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ImageHandle,
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&gEfiDebugMaskProtocolGuid, &mDebugMaskProtocol,
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NULL
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);
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}
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/**
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Returns the debug print error level mask for the current module.
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@return Debug print error level mask for the current module.
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**/
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UINT32
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EFIAPI
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GetDebugPrintErrorLevel (
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VOID
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)
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{
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EFI_STATUS Status;
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EFI_TPL CurrentTpl;
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UINTN Size;
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UINTN GlobalErrorLevel;
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VOID *Hob;
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//
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// If the constructor has not been executed yet, then just return the PCD value.
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// This case should only occur if debug print is generated by a library
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// constructor for this module
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//
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if (mSystemTable == NULL) {
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return PcdGet32 (PcdDebugPrintErrorLevel);
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}
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//
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// Check to see if an attempt has been made to retrieve the global debug print
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// error level mask. Since this library instance stores the global debug print
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// error level mask in an EFI Variable, the EFI Variable should only be accessed
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// once to reduce the overhead of reading the EFI Variable on every debug print
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//
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if (!mGlobalErrorLevelInitialized) {
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//
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// Make sure the TPL Level is low enough for EFI Variable Services to be called
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//
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CurrentTpl = mSystemTable->BootServices->RaiseTPL (TPL_HIGH_LEVEL);
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mSystemTable->BootServices->RestoreTPL (CurrentTpl);
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if (CurrentTpl <= TPL_CALLBACK) {
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//
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// Attempt to retrieve the global debug print error level mask from the
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// EFI Variable
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//
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Size = sizeof (GlobalErrorLevel);
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Status = mSystemTable->RuntimeServices->GetVariable (
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DEBUG_MASK_VARIABLE_NAME,
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&gEfiGenericVariableGuid,
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NULL,
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&Size,
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&GlobalErrorLevel
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);
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if (Status != EFI_NOT_AVAILABLE_YET) {
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//
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// If EFI Variable Services are available, then set a flag so the EFI
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// Variable will not be read again by this module.
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//
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mGlobalErrorLevelInitialized = TRUE;
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if (!EFI_ERROR (Status)) {
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//
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// If the EFI Varible exists, then set this module's module's mask to
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// the global debug print error level mask value.
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//
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mDebugPrintErrorLevel = (UINT32)GlobalErrorLevel;
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}
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} else {
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//
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// If variable services are not yet available optionally get the global
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// debug print error level mask from a HOB.
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//
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Hob = GetFirstGuidHob (&gEfiGenericVariableGuid);
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if (Hob != NULL) {
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if (GET_GUID_HOB_DATA_SIZE (Hob) == sizeof (UINT32)) {
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mDebugPrintErrorLevel = *(UINT32 *)GET_GUID_HOB_DATA (Hob);
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mGlobalErrorLevelInitialized = TRUE;
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}
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}
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}
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}
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}
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//
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// Return the current mask value for this module.
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//
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return mDebugPrintErrorLevel;
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}
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/**
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Sets the global debug print error level mask fpr the entire platform.
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@param ErrorLevel Global debug print error level
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@retval TRUE The debug print error level mask was sucessfully set.
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@retval FALSE The debug print error level mask could not be set.
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**/
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BOOLEAN
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EFIAPI
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SetDebugPrintErrorLevel (
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UINT32 ErrorLevel
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)
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{
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EFI_STATUS Status;
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EFI_TPL CurrentTpl;
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UINTN Size;
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UINTN GlobalErrorLevel;
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//
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// Make sure the constructor has been executed
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//
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if (mSystemTable != NULL) {
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//
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// Make sure the TPL Level is low enough for EFI Variable Services
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//
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CurrentTpl = mSystemTable->BootServices->RaiseTPL (TPL_HIGH_LEVEL);
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mSystemTable->BootServices->RestoreTPL (CurrentTpl);
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if (CurrentTpl <= TPL_CALLBACK) {
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//
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// Attempt to store the global debug print error level mask in an EFI Variable
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//
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GlobalErrorLevel = (UINTN)ErrorLevel;
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Size = sizeof (GlobalErrorLevel);
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Status = mSystemTable->RuntimeServices->SetVariable (
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DEBUG_MASK_VARIABLE_NAME,
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&gEfiGenericVariableGuid,
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(EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS),
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Size,
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&GlobalErrorLevel
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);
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if (!EFI_ERROR (Status)) {
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//
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// If the EFI Variable was updated, then update the mask value for this
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// module and return TRUE.
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//
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mGlobalErrorLevelInitialized = TRUE;
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mDebugPrintErrorLevel = ErrorLevel;
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return TRUE;
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}
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}
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}
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//
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// Return FALSE since the EFI Variable could not be updated.
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//
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return FALSE;
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}
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/**
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Retrieves the current debug print error level mask for a module are returns
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it in CurrentDebugMask.
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@param This The protocol instance pointer.
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@param CurrentDebugMask Pointer to the debug print error level mask that
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is returned.
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@retval EFI_SUCCESS The current debug print error level mask was
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returned in CurrentDebugMask.
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@retval EFI_INVALID_PARAMETER CurrentDebugMask is NULL.
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@retval EFI_DEVICE_ERROR The current debug print error level mask could
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not be retrieved.
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**/
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EFI_STATUS
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EFIAPI
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GetDebugMask (
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IN EFI_DEBUG_MASK_PROTOCOL *This,
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IN OUT UINTN *CurrentDebugMask
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)
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{
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if (CurrentDebugMask == NULL) {
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return EFI_INVALID_PARAMETER;
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}
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//
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// Retrieve the current debug mask from mDebugPrintErrorLevel
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//
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*CurrentDebugMask = (UINTN)mDebugPrintErrorLevel;
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return EFI_SUCCESS;
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}
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/**
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Sets the current debug print error level mask for a module to the value
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specified by NewDebugMask.
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@param This The protocol instance pointer.
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@param NewDebugMask The new debug print error level mask for this module.
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@retval EFI_SUCCESS The current debug print error level mask was
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set to the value specified by NewDebugMask.
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@retval EFI_DEVICE_ERROR The current debug print error level mask could
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not be set to the value specified by NewDebugMask.
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**/
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EFI_STATUS
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EFIAPI
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SetDebugMask (
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IN EFI_DEBUG_MASK_PROTOCOL *This,
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IN UINTN NewDebugMask
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)
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{
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//
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// Store the new debug mask into mDebugPrintErrorLevel
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//
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mDebugPrintErrorLevel = (UINT32)NewDebugMask;
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return EFI_SUCCESS;
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}
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