diff options
| author | Jordan Justen <jordan.l.justen@intel.com> | 2014-11-13 18:24:59 +0000 |
|---|---|---|
| committer | jljusten <jljusten@Edk2> | 2014-11-13 18:24:59 +0000 |
| commit | fab82c1873b792bce33fb22c32db71324fc0ac3b (patch) | |
| tree | bfda1f1c1e5e7b3f8353fd893828fa9e39dd5431 /UefiCpuPkg | |
| parent | 1535c888c6f06bb35881e83cd7ee49fb8554942b (diff) | |
| download | edk2-platforms-fab82c1873b792bce33fb22c32db71324fc0ac3b.tar.xz | |
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
Diffstat (limited to 'UefiCpuPkg')
| -rw-r--r-- | UefiCpuPkg/CpuDxe/CpuDxe.inf | 6 | ||||
| -rw-r--r-- | UefiCpuPkg/CpuDxe/CpuMp.c | 4 | ||||
| -rw-r--r-- | UefiCpuPkg/CpuDxe/CpuMp.h | 27 | ||||
| -rw-r--r-- | UefiCpuPkg/CpuDxe/Ia32/MpAsm.asm | 75 | ||||
| -rw-r--r-- | UefiCpuPkg/CpuDxe/Ia32/MpAsm.nasm | 68 | ||||
| -rw-r--r-- | UefiCpuPkg/CpuDxe/X64/MpAsm.asm | 76 | ||||
| -rw-r--r-- | UefiCpuPkg/CpuDxe/X64/MpAsm.nasm | 70 |
7 files changed, 326 insertions, 0 deletions
diff --git a/UefiCpuPkg/CpuDxe/CpuDxe.inf b/UefiCpuPkg/CpuDxe/CpuDxe.inf index e49548f40b..9952eb7007 100644 --- a/UefiCpuPkg/CpuDxe/CpuDxe.inf +++ b/UefiCpuPkg/CpuDxe/CpuDxe.inf @@ -53,11 +53,17 @@ Ia32/CpuAsm.asm | MSFT
Ia32/CpuAsm.asm | INTEL
Ia32/CpuAsm.S | GCC
+ Ia32/MpAsm.asm | MSFT
+ Ia32/MpAsm.asm | INTEL
+ Ia32/MpAsm.nasm | GCC
[Sources.X64]
X64/CpuAsm.asm | MSFT
X64/CpuAsm.asm | INTEL
X64/CpuAsm.S | GCC
+ X64/MpAsm.asm | MSFT
+ X64/MpAsm.asm | INTEL
+ X64/MpAsm.nasm | GCC
[Protocols]
gEfiCpuArchProtocolGuid ## PRODUCES
diff --git a/UefiCpuPkg/CpuDxe/CpuMp.c b/UefiCpuPkg/CpuDxe/CpuMp.c index aa564c1f93..ea403e8e12 100644 --- a/UefiCpuPkg/CpuDxe/CpuMp.c +++ b/UefiCpuPkg/CpuDxe/CpuMp.c @@ -15,6 +15,10 @@ #include "CpuDxe.h"
#include "CpuMp.h"
+VOID *mCommonStack = 0;
+VOID *mTopOfApCommonStack = 0;
+
+
/**
Application Processor C code entry point.
diff --git a/UefiCpuPkg/CpuDxe/CpuMp.h b/UefiCpuPkg/CpuDxe/CpuMp.h index 93d054002a..dd2d0e1200 100644 --- a/UefiCpuPkg/CpuDxe/CpuMp.h +++ b/UefiCpuPkg/CpuDxe/CpuMp.h @@ -24,5 +24,32 @@ InitializeMpSupport ( VOID
);
+/**
+ The AP entry point that the Startup-IPI target code will jump to.
+
+ The processor jumps to this code in flat mode, but the processor's
+ stack is not initialized.
+
+**/
+VOID
+EFIAPI
+AsmApEntryPoint (
+ VOID
+ );
+
+/**
+ Releases the lock preventing other APs from using the shared AP
+ stack.
+
+ Once the AP has transitioned to using a new stack, it can call this
+ function to allow another AP to proceed with using the shared stack.
+
+**/
+VOID
+EFIAPI
+AsmApDoneWithCommonStack (
+ VOID
+ );
+
#endif // _CPU_MP_H_
diff --git a/UefiCpuPkg/CpuDxe/Ia32/MpAsm.asm b/UefiCpuPkg/CpuDxe/Ia32/MpAsm.asm new file mode 100644 index 0000000000..d476829b91 --- /dev/null +++ b/UefiCpuPkg/CpuDxe/Ia32/MpAsm.asm @@ -0,0 +1,75 @@ +;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006 - 2014, Intel Corporation. All rights reserved.<BR>
+; 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
+; http://opensource.org/licenses/bsd-license.php.
+;
+; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+;
+;------------------------------------------------------------------------------
+
+.586p
+.model flat, C
+
+extern mTopOfApCommonStack:DWORD
+extern ApEntryPointInC:PROC
+
+.code
+
+;
+; This lock only allows one AP to use the mTopOfApCommonStack stack at a time
+;
+ApStackLock dd 0
+
+;.code
+
+;------------------------------------------------------------------------------
+; VOID
+; EFIAPI
+; AsmApEntryPoint (
+; VOID
+; );
+;------------------------------------------------------------------------------
+AsmApEntryPoint PROC
+
+ cli
+AsmApEntryPointAcquireLock:
+lock bts dword ptr [ApStackLock], 0
+ pause
+ jc AsmApEntryPointAcquireLock
+
+ mov esp, [mTopOfApCommonStack]
+ call ApEntryPointInC
+
+ cli
+
+lock btc dword ptr [ApStackLock], 0
+
+ mov eax, 100h
+AsmApEntryPointShareLock:
+ pause
+ dec eax
+ jnz AsmApEntryPointShareLock
+
+ jmp AsmApEntryPoint
+
+AsmApEntryPoint ENDP
+
+;------------------------------------------------------------------------------
+; VOID
+; EFIAPI
+; AsmApDoneWithCommonStack (
+; VOID
+; );
+;------------------------------------------------------------------------------
+AsmApDoneWithCommonStack PROC PUBLIC
+
+lock btc dword ptr [ApStackLock], 0
+ ret
+
+AsmApDoneWithCommonStack ENDP
+
+END
diff --git a/UefiCpuPkg/CpuDxe/Ia32/MpAsm.nasm b/UefiCpuPkg/CpuDxe/Ia32/MpAsm.nasm new file mode 100644 index 0000000000..c47cdcef54 --- /dev/null +++ b/UefiCpuPkg/CpuDxe/Ia32/MpAsm.nasm @@ -0,0 +1,68 @@ +;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006 - 2014, Intel Corporation. All rights reserved.<BR>
+; 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
+; http://opensource.org/licenses/bsd-license.php.
+;
+; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+;
+;------------------------------------------------------------------------------
+
+extern ASM_PFX(mTopOfApCommonStack)
+extern ASM_PFX(ApEntryPointInC)
+
+SECTION .data
+
+;
+; This lock only allows one AP to use the mTopOfApCommonStack stack at a time
+;
+ApStackLock:
+ dd 0
+
+SECTION .text
+
+;------------------------------------------------------------------------------
+; VOID
+; EFIAPI
+; AsmApEntryPoint (
+; VOID
+; );
+;------------------------------------------------------------------------------
+global ASM_PFX(AsmApEntryPoint)
+ASM_PFX(AsmApEntryPoint):
+ cli
+AsmApEntryPointAcquireLock:
+lock bts dword [ApStackLock], 0
+ pause
+ jc AsmApEntryPointAcquireLock
+
+ mov esp, [ASM_PFX(mTopOfApCommonStack)]
+ call ASM_PFX(ApEntryPointInC)
+
+ cli
+
+lock btc dword [ApStackLock], 0
+
+ mov eax, 0x100
+AsmApEntryPointShareLock:
+ pause
+ dec eax
+ jnz AsmApEntryPointShareLock
+
+ jmp ASM_PFX(AsmApEntryPoint)
+
+;------------------------------------------------------------------------------
+; VOID
+; EFIAPI
+; AsmApDoneWithCommonStack (
+; VOID
+; );
+;------------------------------------------------------------------------------
+global ASM_PFX(AsmApDoneWithCommonStack)
+ASM_PFX(AsmApDoneWithCommonStack):
+lock btc dword [ApStackLock], 0
+ ret
+
diff --git a/UefiCpuPkg/CpuDxe/X64/MpAsm.asm b/UefiCpuPkg/CpuDxe/X64/MpAsm.asm new file mode 100644 index 0000000000..308de51330 --- /dev/null +++ b/UefiCpuPkg/CpuDxe/X64/MpAsm.asm @@ -0,0 +1,76 @@ +;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006 - 2014, Intel Corporation. All rights reserved.<BR>
+; 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
+; http://opensource.org/licenses/bsd-license.php.
+;
+; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+;
+;------------------------------------------------------------------------------
+
+#include <Base.h>
+
+extern ASM_PFX(mTopOfApCommonStack):QWORD
+extern ASM_PFX(ApEntryPointInC):PROC
+
+.data
+
+;
+; This lock only allows one AP to use the mTopOfApCommonStack stack at a time
+;
+ApStackLock:
+ dd 0
+
+.code
+
+;------------------------------------------------------------------------------
+; VOID
+; EFIAPI
+; AsmApEntryPoint (
+; VOID
+; );
+;------------------------------------------------------------------------------
+ASM_PFX(AsmApEntryPoint) PROC PUBLIC
+
+ cli
+AsmApEntryPointAcquireLock:
+lock bts dword ptr [ApStackLock], 0
+ pause
+ jc AsmApEntryPointAcquireLock
+
+ mov rsp, [ASM_PFX(mTopOfApCommonStack)]
+ call ASM_PFX(ApEntryPointInC)
+
+ cli
+
+lock btc dword ptr [ApStackLock], 0
+
+ mov eax, 100h
+AsmApEntryPointShareLock:
+ pause
+ dec eax
+ jnz AsmApEntryPointShareLock
+
+ jmp ASM_PFX(AsmApEntryPoint)
+
+ASM_PFX(AsmApEntryPoint) ENDP
+
+;------------------------------------------------------------------------------
+; VOID
+; EFIAPI
+; AsmApDoneWithCommonStack (
+; VOID
+; );
+;------------------------------------------------------------------------------
+ASM_PFX(AsmApDoneWithCommonStack) PROC PUBLIC
+
+lock btc dword ptr [ApStackLock], 0
+ ret
+
+ASM_PFX(AsmApDoneWithCommonStack) ENDP
+
+END
+
diff --git a/UefiCpuPkg/CpuDxe/X64/MpAsm.nasm b/UefiCpuPkg/CpuDxe/X64/MpAsm.nasm new file mode 100644 index 0000000000..e3dc248002 --- /dev/null +++ b/UefiCpuPkg/CpuDxe/X64/MpAsm.nasm @@ -0,0 +1,70 @@ +;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006 - 2014, Intel Corporation. All rights reserved.<BR>
+; 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
+; http://opensource.org/licenses/bsd-license.php.
+;
+; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+;
+;------------------------------------------------------------------------------
+
+extern ASM_PFX(mTopOfApCommonStack)
+extern ASM_PFX(ApEntryPointInC)
+
+DEFAULT REL
+
+SECTION .data
+
+;
+; This lock only allows one AP to use the mTopOfApCommonStack stack at a time
+;
+ApStackLock:
+ dd 0
+
+SECTION .text
+
+;------------------------------------------------------------------------------
+; VOID
+; EFIAPI
+; AsmApEntryPoint (
+; VOID
+; );
+;------------------------------------------------------------------------------
+global ASM_PFX(AsmApEntryPoint)
+ASM_PFX(AsmApEntryPoint):
+ cli
+AsmApEntryPointAcquireLock:
+lock bts dword [ApStackLock], 0
+ pause
+ jc AsmApEntryPointAcquireLock
+
+ mov rsp, [ASM_PFX(mTopOfApCommonStack)]
+ call ASM_PFX(ApEntryPointInC)
+
+ cli
+
+lock btc dword [ApStackLock], 0
+
+ mov eax, 0x100
+AsmApEntryPointShareLock:
+ pause
+ dec eax
+ jnz AsmApEntryPointShareLock
+
+ jmp ASM_PFX(AsmApEntryPoint)
+
+;------------------------------------------------------------------------------
+; VOID
+; EFIAPI
+; AsmApDoneWithCommonStack (
+; VOID
+; );
+;------------------------------------------------------------------------------
+global ASM_PFX(AsmApDoneWithCommonStack)
+ASM_PFX(AsmApDoneWithCommonStack):
+lock btc dword [ApStackLock], 0
+ ret
+
|