Use a register to save PeiServicesTable pointer,
This lib Provides PeiServicesTable pointer saving
and retrieval services.
Signed-off-by: xianglai li <lixiang...@loongson.cn>
---
.../PeiServicesTablePointer.c | 78 +++++++++++++++++++
.../PeiServicesTablePointerLib.inf | 32 ++++++++
2 files changed, 110 insertions(+)
create mode 100644
Platform/Loongson/LoongArchQemuPkg/Library/PeiServicesTablePointerLib/PeiServicesTablePointer.c
create mode 100644
Platform/Loongson/LoongArchQemuPkg/Library/PeiServicesTablePointerLib/PeiServicesTablePointerLib.inf
diff --git
a/Platform/Loongson/LoongArchQemuPkg/Library/PeiServicesTablePointerLib/PeiServicesTablePointer.c
b/Platform/Loongson/LoongArchQemuPkg/Library/PeiServicesTablePointerLib/PeiServicesTablePointer.c
new file mode 100644
index 0000000000..068960d4ce
--- /dev/null
+++
b/Platform/Loongson/LoongArchQemuPkg/Library/PeiServicesTablePointerLib/PeiServicesTablePointer.c
@@ -0,0 +1,78 @@
+/** @file
+ PEI Services Table Pointer Library.
+
+ Copyright (c) 2021 Loongson Technology Corporation Limited. All rights
reserved.<BR>
+
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <PiPei.h>
+#include <Library/PeiServicesTablePointerLib.h>
+#include <Library/DebugLib.h>
+#include "Library/Cpu.h"
+
+/**
+ Caches a pointer PEI Services Table.
+
+ Caches the pointer to the PEI Services Table specified by
PeiServicesTablePointer
+ in a platform specific manner.
+
+ If PeiServicesTablePointer is NULL, then ASSERT ().
+
+ @param PeiServicesTablePointer The address of PeiServices pointer.
+**/
+VOID
+EFIAPI
+SetPeiServicesTablePointer (
+ IN CONST EFI_PEI_SERVICES ** PeiServicesTablePointer
+ )
+{
+ LOONGARCH_CSR_WRITEQ ((UINTN)PeiServicesTablePointer, LOONGARCH_CSR_KS0);
+}
+
+/**
+ Retrieves the cached value of the PEI Services Table pointer.
+
+ Returns the cached value of the PEI Services Table pointer in a CPU specific
manner
+ as specified in the CPU binding section of the Platform Initialization
Pre-EFI
+ Initialization Core Interface Specification.
+
+ If the cached PEI Services Table pointer is NULL, then ASSERT ().
+
+ @return The pointer to PeiServices.
+**/
+CONST EFI_PEI_SERVICES **
+EFIAPI
+GetPeiServicesTablePointer (
+ VOID
+ )
+{
+ UINTN val;
+
+ LOONGARCH_CSR_READQ (val, LOONGARCH_CSR_KS0);
+ return (CONST EFI_PEI_SERVICES **)val;
+}
+
+/**
+Perform CPU specific actions required to migrate the PEI Services Table
+pointer from temporary RAM to permanent RAM.
+
+For IA32 CPUs, the PEI Services Table pointer is stored in the 4 bytes
+immediately preceding the Interrupt Descriptor Table (IDT) in memory.
+For X64 CPUs, the PEI Services Table pointer is stored in the 8 bytes
+immediately preceding the Interrupt Descriptor Table (IDT) in memory.
+For Itanium and ARM CPUs, a the PEI Services Table Pointer is stored in
+a dedicated CPU register. This means that there is no memory storage
+associated with storing the PEI Services Table pointer, so no additional
+migration actions are required for Itanium or ARM CPUs.
+
+**/
+VOID
+EFIAPI
+MigratePeiServicesTablePointer (
+VOID
+)
+{
+ return;
+}
diff --git
a/Platform/Loongson/LoongArchQemuPkg/Library/PeiServicesTablePointerLib/PeiServicesTablePointerLib.inf
b/Platform/Loongson/LoongArchQemuPkg/Library/PeiServicesTablePointerLib/PeiServicesTablePointerLib.inf
new file mode 100644
index 0000000000..6fe76d1351
--- /dev/null
+++
b/Platform/Loongson/LoongArchQemuPkg/Library/PeiServicesTablePointerLib/PeiServicesTablePointerLib.inf
@@ -0,0 +1,32 @@
+## @file
+# PEI Services Table Pointer Library.
+#
+# Copyright (c) 2021 Loongson Technology Corporation Limited. All rights
reserved.<BR>
+#
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+[Defines]
+ INF_VERSION = 0x00010005
+ BASE_NAME = PeiServicesTablePointerLib
+ FILE_GUID = C3C9C4ED-EB8A-4548-BE1B-ABB0B6F35B1E
+ MODULE_TYPE = PEIM
+ VERSION_STRING = 1.0
+ LIBRARY_CLASS = PeiServicesTablePointerLib|PEIM PEI_CORE SEC
+
+#
+# VALID_ARCHITECTURES = LOONGARCH64
+#
+
+[Sources]
+ PeiServicesTablePointer.c
+
+[Packages]
+ Platform/Loongson/LoongArchQemuPkg/Loongson.dec
+ MdePkg/MdePkg.dec
+
+[LibraryClasses]
+ DebugLib
+
+[Pcd]
+
--
2.27.0
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