diff options
| author | Jeff Fan <jeff.fan@intel.com> | 2016-07-20 22:47:47 +0800 |
|---|---|---|
| committer | Jeff Fan <jeff.fan@intel.com> | 2016-08-17 19:58:56 +0800 |
| commit | 7615702169b838f9341c312739d29f0795ebd998 (patch) | |
| tree | b4a0a7bbd6e822d31422a9dee38a4181e902bc6d /UefiCpuPkg/Library/MpInitLib/Ia32/MpFuncs.nasm | |
| parent | 5c66d125eaae51945c0a14ef6d5d3fa2ce7d7a66 (diff) | |
| download | edk2-platforms-7615702169b838f9341c312739d29f0795ebd998.tar.xz | |
UefiCpuPkg/MpInitLib: Add AsmRelocateApLoop() assembly code
AsmRelocateApLoop() is used to place APs into MWAIT-loop if MonitorMwait
feature is supported before hand-off to OS, or place APs into HLT-loop if
MonitorMwait feature is not supported.
If the current mode is long mode, we will switch APs to protected mode
before placing APs in MWAIT-loop or HLT-loop. Thus, once APs wakeup from
loop, APs needn't the page table that may be crashed by OS.
v3:
1. Rename AsmRellocateApLoop to AsmRelocateApLoop.
2. Fix typo Proteced to Protected.
3. Fix typo segement to segment
4. Use word MONITOR instead of mwait-monitor.
Cc: Michael Kinney <michael.d.kinney@intel.com>
Cc: Feng Tian <feng.tian@intel.com>
Cc: Giri P Mudusuru <giri.p.mudusuru@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Fan <jeff.fan@intel.com>
Reviewed-by: Giri P Mudusuru <giri.p.mudusuru@intel.com>
Reviewed-by: Michael Kinney <michael.d.kinney@intel.com>
Tested-by: Laszlo Ersek <lersek@redhat.com>
Tested-by: Michael Kinney <michael.d.kinney@intel.com>
Diffstat (limited to 'UefiCpuPkg/Library/MpInitLib/Ia32/MpFuncs.nasm')
| -rw-r--r-- | UefiCpuPkg/Library/MpInitLib/Ia32/MpFuncs.nasm | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/UefiCpuPkg/Library/MpInitLib/Ia32/MpFuncs.nasm b/UefiCpuPkg/Library/MpInitLib/Ia32/MpFuncs.nasm index 8bacb42836..49f5503530 100644 --- a/UefiCpuPkg/Library/MpInitLib/Ia32/MpFuncs.nasm +++ b/UefiCpuPkg/Library/MpInitLib/Ia32/MpFuncs.nasm @@ -169,6 +169,30 @@ CProcedureInvoke: RendezvousFunnelProcEnd:
;-------------------------------------------------------------------------------------
+; AsmRelocateApLoop (MwaitSupport, ApTargetCState, PmCodeSegment);
+;-------------------------------------------------------------------------------------
+global ASM_PFX(AsmRelocateApLoop)
+ASM_PFX(AsmRelocateApLoop):
+AsmRelocateApLoopStart:
+ cmp byte [esp + 4], 1
+ jnz HltLoop
+MwaitLoop:
+ mov eax, esp
+ xor ecx, ecx
+ xor edx, edx
+ monitor
+ mov eax, [esp + 8] ; Mwait Cx, Target C-State per eax[7:4]
+ shl eax, 4
+ mwait
+ jmp MwaitLoop
+HltLoop:
+ cli
+ hlt
+ jmp HltLoop
+ ret
+AsmRelocateApLoopEnd:
+
+;-------------------------------------------------------------------------------------
; AsmGetAddressMap (&AddressMap);
;-------------------------------------------------------------------------------------
global ASM_PFX(AsmGetAddressMap)
|