2008-05-21 03:40:12 +02:00
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/** @file
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2008-07-18 11:50:09 +02:00
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Task priority (TPL) functions.
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2008-04-09 09:07:50 +02:00
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2018-06-27 15:08:52 +02:00
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Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
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2019-04-04 01:05:13 +02:00
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SPDX-License-Identifier: BSD-2-Clause-Patent
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2007-07-04 12:51:54 +02:00
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2008-04-09 09:07:50 +02:00
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**/
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2007-07-04 12:51:54 +02:00
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2008-08-27 16:29:23 +02:00
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#include "DxeMain.h"
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2008-09-23 09:35:34 +02:00
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#include "Event.h"
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2008-05-09 09:08:30 +02:00
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/**
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Set Interrupt State.
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@param Enable The state of enable or disable interrupt
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**/
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2007-07-04 12:51:54 +02:00
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VOID
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CoreSetInterruptState (
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IN BOOLEAN Enable
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)
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{
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2010-02-13 02:57:22 +01:00
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EFI_STATUS Status;
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BOOLEAN InSmm;
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2018-06-27 15:08:52 +02:00
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2010-02-13 02:57:22 +01:00
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if (gCpu == NULL) {
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return;
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}
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2021-12-05 23:54:02 +01:00
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2010-02-13 02:57:22 +01:00
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if (!Enable) {
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gCpu->DisableInterrupt (gCpu);
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return;
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}
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2021-12-05 23:54:02 +01:00
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2010-02-13 02:57:22 +01:00
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if (gSmmBase2 == NULL) {
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gCpu->EnableInterrupt (gCpu);
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return;
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}
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2021-12-05 23:54:02 +01:00
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2010-02-13 02:57:22 +01:00
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Status = gSmmBase2->InSmm (gSmmBase2, &InSmm);
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if (!EFI_ERROR (Status) && !InSmm) {
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gCpu->EnableInterrupt (gCpu);
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2007-07-04 12:51:54 +02:00
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}
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}
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2008-05-09 09:08:30 +02:00
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/**
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2007-07-04 12:51:54 +02:00
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Raise the task priority level to the new level.
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High level is implemented by disabling processor interrupts.
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2008-07-24 04:54:45 +02:00
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@param NewTpl New task priority level
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2007-07-04 12:51:54 +02:00
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2008-05-09 09:08:30 +02:00
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@return The previous task priority level
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2007-07-04 12:51:54 +02:00
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2008-05-09 09:08:30 +02:00
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**/
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EFI_TPL
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EFIAPI
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CoreRaiseTpl (
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IN EFI_TPL NewTpl
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)
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2007-07-04 12:51:54 +02:00
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{
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EFI_TPL OldTpl;
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OldTpl = gEfiCurrentTpl;
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2015-06-01 08:40:38 +02:00
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if (OldTpl > NewTpl) {
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2021-11-17 04:21:29 +01:00
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DEBUG ((DEBUG_ERROR, "FATAL ERROR - RaiseTpl with OldTpl(0x%x) > NewTpl(0x%x)\n", OldTpl, NewTpl));
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2015-06-01 08:40:38 +02:00
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ASSERT (FALSE);
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}
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2021-12-05 23:54:02 +01:00
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2007-07-04 12:51:54 +02:00
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ASSERT (VALID_TPL (NewTpl));
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//
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// If raising to high level, disable interrupts
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//
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if ((NewTpl >= TPL_HIGH_LEVEL) && (OldTpl < TPL_HIGH_LEVEL)) {
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CoreSetInterruptState (FALSE);
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}
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//
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// Set the new value
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//
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gEfiCurrentTpl = NewTpl;
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return OldTpl;
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}
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2008-05-09 09:08:30 +02:00
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/**
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Lowers the task priority to the previous value. If the new
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priority unmasks events at a higher priority, they are dispatched.
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@param NewTpl New, lower, task priority
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**/
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2007-07-04 12:51:54 +02:00
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VOID
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EFIAPI
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CoreRestoreTpl (
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IN EFI_TPL NewTpl
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)
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{
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EFI_TPL OldTpl;
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2017-09-19 07:25:23 +02:00
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EFI_TPL PendingTpl;
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2007-07-04 12:51:54 +02:00
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OldTpl = gEfiCurrentTpl;
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2015-06-01 08:40:38 +02:00
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if (NewTpl > OldTpl) {
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2021-11-17 04:21:29 +01:00
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DEBUG ((DEBUG_ERROR, "FATAL ERROR - RestoreTpl with NewTpl(0x%x) > OldTpl(0x%x)\n", NewTpl, OldTpl));
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2015-06-01 08:40:38 +02:00
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ASSERT (FALSE);
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}
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2021-12-05 23:54:02 +01:00
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2007-07-04 12:51:54 +02:00
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ASSERT (VALID_TPL (NewTpl));
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//
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// If lowering below HIGH_LEVEL, make sure
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// interrupts are enabled
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//
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if ((OldTpl >= TPL_HIGH_LEVEL) && (NewTpl < TPL_HIGH_LEVEL)) {
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2008-07-24 04:54:45 +02:00
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gEfiCurrentTpl = TPL_HIGH_LEVEL;
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2007-07-04 12:51:54 +02:00
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}
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//
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// Dispatch any pending events
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//
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2017-09-19 07:25:23 +02:00
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while (gEventPending != 0) {
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PendingTpl = (UINTN)HighBitSet64 (gEventPending);
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if (PendingTpl <= NewTpl) {
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break;
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}
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gEfiCurrentTpl = PendingTpl;
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2007-07-04 12:51:54 +02:00
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if (gEfiCurrentTpl < TPL_HIGH_LEVEL) {
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CoreSetInterruptState (TRUE);
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}
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2021-12-05 23:54:02 +01:00
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2007-07-04 12:51:54 +02:00
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CoreDispatchEventNotifies (gEfiCurrentTpl);
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}
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//
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// Set the new value
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//
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gEfiCurrentTpl = NewTpl;
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//
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// If lowering below HIGH_LEVEL, make sure
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// interrupts are enabled
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//
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if (gEfiCurrentTpl < TPL_HIGH_LEVEL) {
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CoreSetInterruptState (TRUE);
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}
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}
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