[edk2-devel] [PATCH v3 10/39] MdePkg: Add method of LoongArch64 to PeiServicesTablePointerLibReg

["Chao Li" <lichao@loongson.cn>]

LoongArch uses the reigster LOONGARCH_CSR_KS0 in the PEI stage to set
and get the PEI service table pointer. Add this method to
PeiServiceTablePointerLibReg.

This is a code first phase, I will update the PI specification next.

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=4584

Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Zhiguang Liu <zhiguang.liu@intel.com>
Cc: Leif Lindholm <quic_llindhol@quicinc.com>
Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Sami Mujawar <sami.mujawar@arm.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Chao Li <lichao@loongson.cn>
---
 .../LoongArch64/PeiServicesTablePointerReg.c  | 47 +++++++++++++++++++
 .../PeiServicesTablePointerLibReg.inf         |  3 ++
 2 files changed, 50 insertions(+)
 create mode 100644 MdePkg/Library/PeiServicesTablePointerLibReg/LoongArch64/PeiServicesTablePointerReg.c

diff --git a/MdePkg/Library/PeiServicesTablePointerLibReg/LoongArch64/PeiServicesTablePointerReg.c b/MdePkg/Library/PeiServicesTablePointerLibReg/LoongArch64/PeiServicesTablePointerReg.c
new file mode 100644
index 0000000000..368c907992
--- /dev/null
+++ b/MdePkg/Library/PeiServicesTablePointerLibReg/LoongArch64/PeiServicesTablePointerReg.c
@@ -0,0 +1,47 @@
+/** @file
+  PEI Services Table Pointer Library For LoongArch.
+
+  Used Register Mechanism.
+
+  Copyright (c) 2023 Loongson Technology Corporation Limited. All rights reserved.<BR>
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <Register/LoongArch64/Csr.h>
+
+/**
+  Set the pointer PEI Service Table to a CPU register.
+
+  Caches the pointer to the PEI Services Table specified by PeiServicesTablePointer
+  in a platform specific manner.
+
+  @param    PeiServicesTablePointer   The address of PeiServices.
+**/
+VOID
+EFIAPI
+SetPeiServicesTablePointerToRegester (
+  IN UINTN  PeiServicesTablePointer
+  )
+{
+  CsrWrite (LOONGARCH_CSR_KS0, (UINTN)PeiServicesTablePointer);
+}
+
+/**
+  Retrieves the cached value of the PEI Services Table pointer from a CPU register.
+
+  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.
+
+  @return  The pointer to PeiServices.
+**/
+CONST EFI_PEI_SERVICES **
+EFIAPI
+GetPeiServicesTablePointerFromRegister (
+  VOID
+  )
+{
+  return (CONST EFI_PEI_SERVICES **)(CsrRead (LOONGARCH_CSR_KS0));
+}
diff --git a/MdePkg/Library/PeiServicesTablePointerLibReg/PeiServicesTablePointerLibReg.inf b/MdePkg/Library/PeiServicesTablePointerLibReg/PeiServicesTablePointerLibReg.inf
index 22499e22ad..b26a970b12 100644
--- a/MdePkg/Library/PeiServicesTablePointerLibReg/PeiServicesTablePointerLibReg.inf
+++ b/MdePkg/Library/PeiServicesTablePointerLibReg/PeiServicesTablePointerLibReg.inf
@@ -30,6 +30,9 @@
 [Sources]
   PeiServicesTablePointer.c
 
+[Sources.LOONGARCH64]
+  LoongArch64/PeiServicesTablePointerReg.c
+
 [Packages]
   MdePkg/MdePkg.dec
 
-- 
2.27.0



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