sravan/system76-edk2
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

UefiCpuPkg/MpInitLib: Implementation of MpInitLibSwitchBSP()

Browse Source 
v4:
  1. Simply the internal function SwitchBSPWorker()'s comment header
     due to it is duplicated with MpInitLibSwitchBSP().

v3:
  1. Rename MpInitLibSwitchBsp to MpInitLibSwitchBSP.

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
2016-07-21 21:20:18 +08:00
parent 5c9e099797
commit 41be0da59a
4 changed files with 218 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

53
UefiCpuPkg/Library/MpInitLib/MpLib.h
View File

@@ -42,6 +42,23 @@
0x58eb6a19, 0x3699, 0x4c68, { 0xa8, 0x36, 0xda, 0xcd, 0x8e, 0xdc, 0xad, 0x4a } \
}
//
// The MP data for switch BSP
//
#define CPU_SWITCH_STATE_IDLE 0
#define CPU_SWITCH_STATE_STORED 1
#define CPU_SWITCH_STATE_LOADED 2
//
// CPU exchange information for switch BSP
//
typedef struct {
UINT8 State; // offset 0
UINTN StackPointer; // offset 4 / 8
IA32_DESCRIPTOR Gdtr; // offset 8 / 16
IA32_DESCRIPTOR Idtr; // offset 14 / 26
} CPU_EXCHANGE_ROLE_INFO;
//
// AP loop state when APs are in idle state
// It's value is the same with PcdCpuApLoopMode
@@ -198,6 +215,9 @@ struct _CPU_MP_DATA {
AP_INIT_STATE InitFlag;
BOOLEAN X2ApicEnable;
BOOLEAN SwitchBspFlag;
CPU_EXCHANGE_ROLE_INFO BSPInfo;
CPU_EXCHANGE_ROLE_INFO APInfo;
MTRR_SETTINGS MtrrTable;
UINT8 ApLoopMode;
UINT8 ApTargetCState;
@@ -242,6 +262,22 @@ AsmGetAddressMap (
OUT MP_ASSEMBLY_ADDRESS_MAP *AddressMap
);
/**
This function is called by both the BSP and the AP which is to become the BSP to
Exchange execution context including stack between them. After return from this
function, the BSP becomes AP and the AP becomes the BSP.
@param[in] MyInfo Pointer to buffer holding the exchanging information for the executing processor.
@param[in] OthersInfo Pointer to buffer holding the exchanging information for the peer.
**/
VOID
EFIAPI
AsmExchangeRole (
IN CPU_EXCHANGE_ROLE_INFO *MyInfo,
IN CPU_EXCHANGE_ROLE_INFO *OthersInfo
);
/**
Get the pointer to CPU MP Data structure.
@@ -311,6 +347,23 @@ InitMpGlobalData (
IN CPU_MP_DATA *CpuMpData
);
/**
Worker function to switch the requested AP to be the BSP from that point onward.
@param[in] ProcessorNumber The handle number of AP that is to become the new BSP.
@param[in] EnableOldBSP If TRUE, then the old BSP will be listed as an
enabled AP. Otherwise, it will be disabled.
@retval EFI_SUCCESS BSP successfully switched.
@retval others Failed to switch BSP.
**/
EFI_STATUS
SwitchBSPWorker (
IN UINTN ProcessorNumber,
IN BOOLEAN EnableOldBSP
);
/**
Get pointer to CPU MP Data structure from GUIDed HOB.