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UefiCpuPkg/AcpiCpuData: update comments on register table fields 

After commit e992cc3f48 ("UefiCpuPkg PiSmmCpuDxeSmm: Reduce SMRAM
consumption in CpuS3.c", 2021-01-11), it is valid for a CPU S3 Data DXE
Driver to set "ACPI_CPU_DATA.PreSmmInitRegisterTable" and/or
"ACPI_CPU_DATA.RegisterTable" to 0, in case none of the CPUs needs a
register table of the corresponding kind, during S3 resume.

Document this fact in the "UefiCpuPkg/Include/AcpiCpuData.h" header file.

Cc: Eric Dong <eric.dong@intel.com>
Cc: Philippe Mathieu-Daudé <philmd@redhat.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3159
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Ray Ni <ray.ni@intel.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20210119155440.2262-3-lersek@redhat.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
This commit is contained in:
Laszlo Ersek 2021-01-19 16:54:38 +01:00 committed by mergify[bot]
parent cefad282fb
commit 1487c13ce0
1 changed files with 4 additions and 0 deletions
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4
UefiCpuPkg/Include/AcpiCpuData.h
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@ -178,6 +178,8 @@ typedef struct {
// If TableLength is > 0, then elements of RegisterTableEntry are used to
// initialize the CPU that matches InitialApicId, during an ACPI S3 resume,
// before SMBASE relocation is performed.
// If a register table is not required for any one of the CPUs, then
// PreSmmInitRegisterTable may be set to 0.
//
EFI_PHYSICAL_ADDRESS PreSmmInitRegisterTable;
//
@ -187,6 +189,8 @@ typedef struct {
// If TableLength is > 0, then elements of RegisterTableEntry are used to
// initialize the CPU that matches InitialApicId, during an ACPI S3 resume,
// after SMBASE relocation is performed.
// If a register table is not required for any one of the CPUs, then
// RegisterTable may be set to 0.
//
EFI_PHYSICAL_ADDRESS RegisterTable;
//