fab82c1873
The AP startup code simply jumps into this code with the CpuDxe driver
without setting up a stack for the processor.
Therefore, this code must setup the stack before calling into C code.
This is the basic flow:
* AP enters CpuDxe driver code (AsmApEntryPoint) without stack
- AP grabs a lock
- AP sets up stack
- AP calls CpuMp.c:ApEntryPointInC
- If ApEntryPointInC returns, the lock is freed, and another AP may
run
- The AP C code may call AsmApDoneWithCommonStack to indicate that
the AP is no longer using the stack, and another may therefore
proceed to use the stack and then call ApEntryPointInC
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Jeff Fan <jeff.fan@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16347 6f19259b-4bc3-4df7-8a09-765794883524
56 lines
1.2 KiB
C
56 lines
1.2 KiB
C
/** @file
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CPU DXE MP support
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Copyright (c) 2006 - 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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#ifndef _CPU_MP_H_
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#define _CPU_MP_H_
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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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The AP entry point that the Startup-IPI target code will jump to.
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The processor jumps to this code in flat mode, but the processor's
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stack is not initialized.
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**/
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VOID
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EFIAPI
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AsmApEntryPoint (
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VOID
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);
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/**
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Releases the lock preventing other APs from using the shared AP
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stack.
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Once the AP has transitioned to using a new stack, it can call this
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function to allow another AP to proceed with using the shared stack.
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**/
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VOID
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EFIAPI
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AsmApDoneWithCommonStack (
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VOID
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);
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#endif // _CPU_MP_H_
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