6a26a597a3
introduce PCD value: PcdCpuMaxLogicalProcessorNumber and PcdCpuApStackSize, used for initialize APs stacks. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Chen Fan <chen.fan.fnst@cn.fujitsu.com> Reviewed-by: Jeff Fan <jeff.fan@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16350 6f19259b-4bc3-4df7-8a09-765794883524
86 lines
2.2 KiB
C
86 lines
2.2 KiB
C
/** @file
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CPU DXE Module.
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Copyright (c) 2008 - 2014, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include "CpuDxe.h"
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#include "CpuMp.h"
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UINTN gMaxLogicalProcessorNumber;
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UINTN gApStackSize;
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VOID *mCommonStack = 0;
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VOID *mTopOfApCommonStack = 0;
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VOID *mApStackStart = 0;
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volatile UINTN mNumberOfProcessors;
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/**
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Application Processor C code entry point.
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**/
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VOID
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EFIAPI
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ApEntryPointInC (
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VOID
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)
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{
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mNumberOfProcessors++;
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}
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/**
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Initialize Multi-processor support.
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**/
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VOID
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InitializeMpSupport (
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VOID
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)
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{
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gMaxLogicalProcessorNumber = (UINTN) PcdGet32 (PcdCpuMaxLogicalProcessorNumber);
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if (gMaxLogicalProcessorNumber < 1) {
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DEBUG ((DEBUG_ERROR, "Setting PcdCpuMaxLogicalProcessorNumber should be more than zero.\n"));
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return;
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}
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if (gMaxLogicalProcessorNumber == 1) {
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return;
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}
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gApStackSize = (UINTN) PcdGet32 (PcdCpuApStackSize);
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ASSERT ((gApStackSize & (SIZE_4KB - 1)) == 0);
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mApStackStart = AllocatePages (EFI_SIZE_TO_PAGES (gMaxLogicalProcessorNumber * gApStackSize));
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ASSERT (mApStackStart != NULL);
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//
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// the first buffer of stack size used for common stack, when the amount of AP
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// more than 1, we should never free the common stack which maybe used for AP reset.
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//
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mCommonStack = mApStackStart;
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mTopOfApCommonStack = (UINT8*) mApStackStart + gApStackSize;
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mApStackStart = mTopOfApCommonStack;
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mNumberOfProcessors = 1;
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if (mNumberOfProcessors == 1) {
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FreePages (mCommonStack, EFI_SIZE_TO_PAGES (gMaxLogicalProcessorNumber * gApStackSize));
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return;
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}
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if (mNumberOfProcessors < gMaxLogicalProcessorNumber) {
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FreePages (mApStackStart, EFI_SIZE_TO_PAGES ((gMaxLogicalProcessorNumber - mNumberOfProcessors) *
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gApStackSize));
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}
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}
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