mirror of https://github.com/acidanthera/audk.git
Update CpuSleep() for IPF.
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@8315 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
parent
76c2425177
commit
44c0fd78ef
|
@ -1,7 +1,7 @@
|
|||
/** @file
|
||||
Base Library CPU functions for Itanium
|
||||
|
||||
Copyright (c) 2006 - 2008, Intel Corporation<BR>
|
||||
Copyright (c) 2006 - 2009, Intel Corporation<BR>
|
||||
All rights reserved. This program and the accompanying materials
|
||||
are licensed and made available under the terms and conditions of the BSD License
|
||||
which accompanies this distribution. The full text of the license may be found at
|
||||
|
@ -13,6 +13,7 @@
|
|||
**/
|
||||
|
||||
#include <Library/PalLib.h>
|
||||
#include <Library/BaseLib.h>
|
||||
|
||||
/**
|
||||
Places the CPU in a sleep state until an interrupt is received.
|
||||
|
@ -28,5 +29,38 @@ CpuSleep (
|
|||
VOID
|
||||
)
|
||||
{
|
||||
PalCall (29, 0, 0, 0);
|
||||
UINT64 Tpr;
|
||||
|
||||
//
|
||||
// It is the TPR register that controls if external interrupt would bring processor in LIGHT HALT low-power state
|
||||
// back to normal state. PAL_HALT_LIGHT does not depend on PSR setting.
|
||||
// So here if interrupts are disabled (via PSR.i), TRP.mmi needs to be set to prevent processor being interrupted by external interrupts.
|
||||
// If interrupts are enabled, then just use current TRP setting.
|
||||
//
|
||||
if (GetInterruptState ()) {
|
||||
//
|
||||
// If interrupts are enabled, then call PAL_HALT_LIGHT with the current TPR setting.
|
||||
//
|
||||
PalCall (PAL_HALT_LIGHT, 0, 0, 0);
|
||||
} else {
|
||||
//
|
||||
// If interrupts are disabled on entry, then mask all interrupts in TPR before calling PAL_HALT_LIGHT.
|
||||
//
|
||||
|
||||
//
|
||||
// Save TPR
|
||||
//
|
||||
Tpr = AsmReadTpr();
|
||||
//
|
||||
// Set TPR.mmi to mask all external interrupts
|
||||
//
|
||||
AsmWriteTpr (BIT16 | Tpr);
|
||||
|
||||
PalCall (PAL_HALT_LIGHT, 0, 0, 0);
|
||||
|
||||
//
|
||||
// Restore TPR
|
||||
//
|
||||
AsmWriteTpr (Tpr);
|
||||
}
|
||||
}
|
||||
|
|
Loading…
Reference in New Issue