UefiCpuPkg/MpInitLib: Place APs in safe loop before hand-off to OS

Register Exit Boot Service callback function MpInitExitBootServicesCallback() to
place AP one safe loop before hand-off to OS.

Allocated one reserved memory and copy the AsmRellocateApLoop() code into it. It
could avoid the CPU Dxe driver (located in Boot Service data range) crashed
after Exit Boot Service event.
Place AP into the target Cx-State (specified by PcdCpuApTargetCstate) could save
power if Monitor-mwait feature supported.
In long mode, switch AP into protected mode could let AP not require page table
when executing this safe loop. Page Table (located in Boot Service data range)
may crashed after Exit Boot Service event.

v3:
  1. Rename *RellocateAp* to *RelocateAp*

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: Michael Kinney <michael.d.kinney@intel.com>
Tested-by: Laszlo Ersek <lersek@redhat.com>
Tested-by: Michael Kinney <michael.d.kinney@intel.com>
This commit is contained in:
Jeff Fan
2016-07-24 23:03:12 +08:00
parent 86efe97693
commit 4d3314f694
2 changed files with 108 additions and 0 deletions

View File

@@ -519,6 +519,17 @@ MicrocodeDetect (
IN CPU_MP_DATA *CpuMpData
);
/**
Detect whether Mwait-monitor feature is supported.
@retval TRUE Mwait-monitor feature is supported.
@retval FALSE Mwait-monitor feature is not supported.
**/
BOOLEAN
IsMwaitSupport (
VOID
);
/**
Notify function on End Of PEI PPI.