mirror of https://github.com/acidanthera/audk.git
UefiCpuPkg/CpuDxe: Add stackless assembly AP entry points
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
This commit is contained in:
Jordan Justen
jljusten
parent
1535c888c6
commit
fab82c1873
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@ -53,11 +53,17 @@
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Ia32/CpuAsm.asm | MSFT
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Ia32/CpuAsm.asm | INTEL
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Ia32/CpuAsm.S | GCC
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Ia32/MpAsm.asm | MSFT
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Ia32/MpAsm.asm | INTEL
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Ia32/MpAsm.nasm | GCC
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[Sources.X64]
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X64/CpuAsm.asm | MSFT
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X64/CpuAsm.asm | INTEL
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X64/CpuAsm.S | GCC
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X64/MpAsm.asm | MSFT
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X64/MpAsm.asm | INTEL
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X64/MpAsm.nasm | GCC
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[Protocols]
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gEfiCpuArchProtocolGuid ## PRODUCES
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@ -15,6 +15,10 @@
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#include "CpuDxe.h"
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#include "CpuMp.h"
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VOID *mCommonStack = 0;
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VOID *mTopOfApCommonStack = 0;
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/**
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Application Processor C code entry point.
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@ -24,5 +24,32 @@ 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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@ -0,0 +1,75 @@
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;------------------------------------------------------------------------------
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;
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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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;
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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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;------------------------------------------------------------------------------
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.586p
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.model flat, C
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extern mTopOfApCommonStack:DWORD
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extern ApEntryPointInC:PROC
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.code
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;
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; This lock only allows one AP to use the mTopOfApCommonStack stack at a time
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;
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ApStackLock dd 0
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;.code
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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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AsmApEntryPoint PROC
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cli
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AsmApEntryPointAcquireLock:
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lock bts dword ptr [ApStackLock], 0
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pause
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jc AsmApEntryPointAcquireLock
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mov esp, [mTopOfApCommonStack]
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call ApEntryPointInC
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cli
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lock btc dword ptr [ApStackLock], 0
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mov eax, 100h
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AsmApEntryPointShareLock:
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pause
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dec eax
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jnz AsmApEntryPointShareLock
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jmp AsmApEntryPoint
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AsmApEntryPoint ENDP
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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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;------------------------------------------------------------------------------
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AsmApDoneWithCommonStack PROC PUBLIC
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lock btc dword ptr [ApStackLock], 0
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ret
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AsmApDoneWithCommonStack ENDP
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END
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@ -0,0 +1,68 @@
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;------------------------------------------------------------------------------
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;
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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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;
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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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;------------------------------------------------------------------------------
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extern ASM_PFX(mTopOfApCommonStack)
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extern ASM_PFX(ApEntryPointInC)
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SECTION .data
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;
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; This lock only allows one AP to use the mTopOfApCommonStack stack at a time
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;
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ApStackLock:
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dd 0
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SECTION .text
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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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global ASM_PFX(AsmApEntryPoint)
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ASM_PFX(AsmApEntryPoint):
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cli
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AsmApEntryPointAcquireLock:
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lock bts dword [ApStackLock], 0
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pause
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jc AsmApEntryPointAcquireLock
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mov esp, [ASM_PFX(mTopOfApCommonStack)]
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call ASM_PFX(ApEntryPointInC)
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cli
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lock btc dword [ApStackLock], 0
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mov eax, 0x100
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AsmApEntryPointShareLock:
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pause
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dec eax
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jnz AsmApEntryPointShareLock
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jmp ASM_PFX(AsmApEntryPoint)
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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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;------------------------------------------------------------------------------
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global ASM_PFX(AsmApDoneWithCommonStack)
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ASM_PFX(AsmApDoneWithCommonStack):
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lock btc dword [ApStackLock], 0
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ret
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@ -0,0 +1,76 @@
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;------------------------------------------------------------------------------
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;
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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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;
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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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;------------------------------------------------------------------------------
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#include <Base.h>
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extern ASM_PFX(mTopOfApCommonStack):QWORD
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extern ASM_PFX(ApEntryPointInC):PROC
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.data
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;
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; This lock only allows one AP to use the mTopOfApCommonStack stack at a time
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;
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ApStackLock:
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dd 0
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.code
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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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ASM_PFX(AsmApEntryPoint) PROC PUBLIC
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cli
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AsmApEntryPointAcquireLock:
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lock bts dword ptr [ApStackLock], 0
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pause
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jc AsmApEntryPointAcquireLock
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mov rsp, [ASM_PFX(mTopOfApCommonStack)]
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call ASM_PFX(ApEntryPointInC)
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cli
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lock btc dword ptr [ApStackLock], 0
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mov eax, 100h
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AsmApEntryPointShareLock:
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pause
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dec eax
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jnz AsmApEntryPointShareLock
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jmp ASM_PFX(AsmApEntryPoint)
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ASM_PFX(AsmApEntryPoint) ENDP
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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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;------------------------------------------------------------------------------
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ASM_PFX(AsmApDoneWithCommonStack) PROC PUBLIC
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lock btc dword ptr [ApStackLock], 0
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ret
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ASM_PFX(AsmApDoneWithCommonStack) ENDP
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END
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@ -0,0 +1,70 @@
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;------------------------------------------------------------------------------
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;
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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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;
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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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;------------------------------------------------------------------------------
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extern ASM_PFX(mTopOfApCommonStack)
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extern ASM_PFX(ApEntryPointInC)
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DEFAULT REL
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SECTION .data
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;
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; This lock only allows one AP to use the mTopOfApCommonStack stack at a time
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;
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ApStackLock:
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dd 0
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SECTION .text
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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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global ASM_PFX(AsmApEntryPoint)
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ASM_PFX(AsmApEntryPoint):
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cli
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AsmApEntryPointAcquireLock:
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lock bts dword [ApStackLock], 0
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pause
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jc AsmApEntryPointAcquireLock
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mov rsp, [ASM_PFX(mTopOfApCommonStack)]
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call ASM_PFX(ApEntryPointInC)
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cli
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lock btc dword [ApStackLock], 0
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mov eax, 0x100
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AsmApEntryPointShareLock:
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pause
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dec eax
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jnz AsmApEntryPointShareLock
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jmp ASM_PFX(AsmApEntryPoint)
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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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;------------------------------------------------------------------------------
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global ASM_PFX(AsmApDoneWithCommonStack)
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ASM_PFX(AsmApDoneWithCommonStack):
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lock btc dword [ApStackLock], 0
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ret
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