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UefiCpuPkg/PeiMpLib: Only allocate ACPI NVS AP loop code buffer on S3

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This commit allocated an ACPI NVS buffer in PEI:
cdc1a88272

This is a RT visible memory type that remains fragmented against the
overall `EfiACPIMemoryNVS` memory bucket allocated by the DXE Core.

Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>
This commit is contained in:
Michael Kubacki
2025-10-08 10:41:20 -07:00
committed by mergify[bot]
parent e494b25fe3
commit db4d323909
1 changed files with 15 additions and 2 deletions
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17
UefiCpuPkg/Library/MpInitLib/PeiMpLib.c
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@ -439,11 +439,24 @@ InitMpGlobalData (
IN CPU_MP_DATA *CpuMpData
)
{
EFI_STATUS Status;
EFI_STATUS Status;
EFI_BOOT_MODE BootMode;
BuildMicrocodeCacheHob (CpuMpData);
SaveCpuMpData (CpuMpData);
PrepareApLoopCode (CpuMpData);
Status = PeiServicesGetBootMode (&BootMode);
ASSERT_EFI_ERROR (Status);
if (!EFI_ERROR (Status) && (BootMode == BOOT_ON_S3_RESUME)) {
//
// Only allocate the AP loop code buffer on S3 resume.
// This allocates ACPI NVS memory which is a RT visible memory type that
// remains fragmented against the overall EfiACPIMemoryNVS memory bucket
// allocated by the DXE Core.
//
PrepareApLoopCode (CpuMpData);
}
///
/// Install Notify