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/** @file
Task priority (TPL) functions.
Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include "DxeMain.h"
#include "Event.h"
/**
Set Interrupt State.
@param Enable The state of enable or disable interrupt
**/
VOID
CoreSetInterruptState (
IN BOOLEAN Enable
)
{
EFI_STATUS Status;
BOOLEAN InSmm;
if (gCpu == NULL) {
return;
}
if (!Enable) {
gCpu->DisableInterrupt (gCpu);
return;
}
if (gSmmBase2 == NULL) {
gCpu->EnableInterrupt (gCpu);
return;
}
Status = gSmmBase2->InSmm (gSmmBase2, &InSmm);
if (!EFI_ERROR (Status) && !InSmm) {
gCpu->EnableInterrupt (gCpu);
}
}
/**
Raise the task priority level to the new level.
High level is implemented by disabling processor interrupts.
@param NewTpl New task priority level
@return The previous task priority level
**/
EFI_TPL
EFIAPI
CoreRaiseTpl (
IN EFI_TPL NewTpl
)
{
EFI_TPL OldTpl;
OldTpl = gEfiCurrentTpl;
if (OldTpl > NewTpl) {
DEBUG ((DEBUG_ERROR, "FATAL ERROR - RaiseTpl with OldTpl(0x%x) > NewTpl(0x%x)\n", OldTpl, NewTpl));
ASSERT (FALSE);
}
ASSERT (VALID_TPL (NewTpl));
//
// If raising to high level, disable interrupts
//
if ((NewTpl >= TPL_HIGH_LEVEL) && (OldTpl < TPL_HIGH_LEVEL)) {
CoreSetInterruptState (FALSE);
}
//
// Set the new value
//
gEfiCurrentTpl = NewTpl;
return OldTpl;
}
/**
Lowers the task priority to the previous value. If the new
priority unmasks events at a higher priority, they are dispatched.
@param NewTpl New, lower, task priority
**/
VOID
EFIAPI
CoreRestoreTpl (
IN EFI_TPL NewTpl
)
{
EFI_TPL OldTpl;
EFI_TPL PendingTpl;
OldTpl = gEfiCurrentTpl;
if (NewTpl > OldTpl) {
DEBUG ((DEBUG_ERROR, "FATAL ERROR - RestoreTpl with NewTpl(0x%x) > OldTpl(0x%x)\n", NewTpl, OldTpl));
ASSERT (FALSE);
}
ASSERT (VALID_TPL (NewTpl));
//
// If lowering below HIGH_LEVEL, make sure
// interrupts are enabled
//
if ((OldTpl >= TPL_HIGH_LEVEL) && (NewTpl < TPL_HIGH_LEVEL)) {
gEfiCurrentTpl = TPL_HIGH_LEVEL;
}
//
// Dispatch any pending events
//
while (gEventPending != 0) {
PendingTpl = (UINTN)HighBitSet64 (gEventPending);
if (PendingTpl <= NewTpl) {
break;
}
gEfiCurrentTpl = PendingTpl;
if (gEfiCurrentTpl < TPL_HIGH_LEVEL) {
CoreSetInterruptState (TRUE);
}
CoreDispatchEventNotifies (gEfiCurrentTpl);
}
//
// Set the new value
//
gEfiCurrentTpl = NewTpl;
//
// If lowering below HIGH_LEVEL, make sure
// interrupts are enabled
//
if (gEfiCurrentTpl < TPL_HIGH_LEVEL) {
CoreSetInterruptState (TRUE);
}
}
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