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UefiCpuPkg/CpuMpPei: Find available memory < 1MB for AP reset code 

Search memory resource HOB list to find one available system memory under 1MB
for AP reset code and exchange information between BSP and APs.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Fan <jeff.fan@intel.com>
Reviewed-by: Feng Tian <feng.tian@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17989 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Jeff Fan 2015-07-15 03:29:40 +00:00 committed by vanjeff
parent f9d30595ae
commit 05e107f8f2
3 changed files with 73 additions and 0 deletions
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71
UefiCpuPkg/CpuMpPei/CpuMpPei.c
View File

@ -38,6 +38,77 @@ GLOBAL_REMOVE_IF_UNREFERENCED IA32_DESCRIPTOR mGdt = {
(UINTN) mGdtEntries
};
/**
Get available system memory below 1MB by specified size.
@param WakeupBufferSize Wakeup buffer size required
@retval other Return wakeup buffer address below 1MB.
@retval -1 Cannot find free memory below 1MB.
**/
UINTN
GetWakeupBuffer (
IN UINTN WakeupBufferSize
)
{
EFI_PEI_HOB_POINTERS Hob;
UINTN WakeupBufferStart;
UINTN WakeupBufferEnd;
//
// Get the HOB list for processing
//
Hob.Raw = GetHobList ();
//
// Collect memory ranges
//
while (!END_OF_HOB_LIST (Hob)) {
if (Hob.Header->HobType == EFI_HOB_TYPE_RESOURCE_DESCRIPTOR) {
if ((Hob.ResourceDescriptor->PhysicalStart < BASE_1MB) &&
(Hob.ResourceDescriptor->ResourceType == EFI_RESOURCE_SYSTEM_MEMORY) &&
((Hob.ResourceDescriptor->ResourceAttribute &
(EFI_RESOURCE_ATTRIBUTE_READ_PROTECTED |
EFI_RESOURCE_ATTRIBUTE_WRITE_PROTECTED |
EFI_RESOURCE_ATTRIBUTE_EXECUTION_PROTECTED
)) == 0)
) {
//
// Need memory under 1MB to be collected here
//
WakeupBufferEnd = (UINTN) (Hob.ResourceDescriptor->PhysicalStart + Hob.ResourceDescriptor->ResourceLength);
if (WakeupBufferEnd > BASE_1MB) {
//
// Wakeup buffer should be under 1MB
//
WakeupBufferEnd = BASE_1MB;
}
//
// Wakeup buffer should be aligned on 4KB
//
WakeupBufferStart = (WakeupBufferEnd - WakeupBufferSize) & ~(SIZE_4KB - 1);
if (WakeupBufferStart < Hob.ResourceDescriptor->PhysicalStart) {
continue;
}
//
// Create a memory allocation HOB.
//
BuildMemoryAllocationHob (
WakeupBufferStart,
WakeupBufferSize,
EfiBootServicesData
);
return WakeupBufferStart;
}
}
//
// Find the next HOB
//
Hob.Raw = GET_NEXT_HOB (Hob);
}
return (UINTN) -1;
}
/**
The Entry point of the MP CPU PEIM.

1
UefiCpuPkg/CpuMpPei/CpuMpPei.h
View File

@ -19,6 +19,7 @@
#include <Library/BaseLib.h>
#include <Library/HobLib.h>
#include <Library/PeimEntryPoint.h>
#pragma pack(1)

1
UefiCpuPkg/CpuMpPei/CpuMpPei.inf
View File

@ -49,6 +49,7 @@
[LibraryClasses]
BaseLib
HobLib
PeimEntryPoint