[edk2-devel] [PATCH v3 33/34] MdeModulePkg/DxeIplPeim : LoongArch DxeIPL implementation.

[Chao Li]

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4053

Implement LoongArch DxeIPL instance.

Cc: Liming Gao <gaoliming at byosoft.com.cn>
Cc: Guomin Jiang <guomin.jiang at intel.com>

Signed-off-by: Chao Li <lichao at loongson.cn>
Co-authored-by: Baoqi Zhang <zhangbaoqi at loongson.cn>

Reviewed-by: Liming Gao <gaoliming at byosoft.com.cn>
---
 MdeModulePkg/Core/DxeIplPeim/DxeIpl.inf       |  6 +-
 .../Core/DxeIplPeim/LoongArch64/DxeLoadFunc.c | 63 +++++++++++++++++++
 2 files changed, 68 insertions(+), 1 deletion(-)
 create mode 100644 MdeModulePkg/Core/DxeIplPeim/LoongArch64/DxeLoadFunc.c

diff --git a/MdeModulePkg/Core/DxeIplPeim/DxeIpl.inf b/MdeModulePkg/Core/DxeIplPeim/DxeIpl.inf
index 19b8a4c8ae..052ea0ec1a 100644
--- a/MdeModulePkg/Core/DxeIplPeim/DxeIpl.inf
+++ b/MdeModulePkg/Core/DxeIplPeim/DxeIpl.inf
@@ -8,6 +8,7 @@
 #  Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR>
 #  Copyright (c) 2017, AMD Incorporated. All rights reserved.<BR>
 #  Copyright (c) 2020, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>
+#  Copyright (c) 2022, Loongson Technology Corporation Limited. All rights reserved.<BR>
 #
 #  SPDX-License-Identifier: BSD-2-Clause-Patent
 #
@@ -26,7 +27,7 @@
 #
 # The following information is for reference only and not required by the build tools.
 #
-#  VALID_ARCHITECTURES           = IA32 X64 EBC (EBC is for build only) AARCH64 RISCV64
+#  VALID_ARCHITECTURES           = IA32 X64 EBC (EBC is for build only) AARCH64 RISCV64 LOONGARCH64
 #
 
 [Sources]
@@ -53,6 +54,9 @@
 [Sources.RISCV64]
   RiscV64/DxeLoadFunc.c
 
+[Sources.LOONGARCH64]
+  LoongArch64/DxeLoadFunc.c
+
 [Packages]
   MdePkg/MdePkg.dec
   MdeModulePkg/MdeModulePkg.dec
diff --git a/MdeModulePkg/Core/DxeIplPeim/LoongArch64/DxeLoadFunc.c b/MdeModulePkg/Core/DxeIplPeim/LoongArch64/DxeLoadFunc.c
new file mode 100644
index 0000000000..95d3af19ea
--- /dev/null
+++ b/MdeModulePkg/Core/DxeIplPeim/LoongArch64/DxeLoadFunc.c
@@ -0,0 +1,63 @@
+/** @file
+  LoongArch specifc functionality for DxeLoad.
+
+  Copyright (c) 2022, Loongson Technology Corporation Limited. All rights reserved.<BR>
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include "DxeIpl.h"
+
+/**
+   Transfers control to DxeCore.
+
+   This function performs a CPU architecture specific operations to execute
+   the entry point of DxeCore with the parameters of HobList.
+   It also installs EFI_END_OF_PEI_PPI to signal the end of PEI phase.
+
+   @param[in] DxeCoreEntryPoint         The entry point of DxeCore.
+   @param[in] HobList                   The start of HobList passed to DxeCore.
+
+**/
+VOID
+HandOffToDxeCore (
+  IN EFI_PHYSICAL_ADDRESS  DxeCoreEntryPoint,
+  IN EFI_PEI_HOB_POINTERS  HobList
+  )
+{
+  VOID        *BaseOfStack;
+  VOID        *TopOfStack;
+  EFI_STATUS  Status;
+
+  //
+  // Allocate 128KB for the Stack
+  //
+  BaseOfStack = AllocatePages (EFI_SIZE_TO_PAGES (STACK_SIZE));
+  ASSERT (BaseOfStack != NULL);
+
+  //
+  // Compute the top of the stack we were allocated. Pre-allocate a UINTN
+  // for safety.
+  //
+  TopOfStack = (VOID *)((UINTN)BaseOfStack + EFI_SIZE_TO_PAGES (STACK_SIZE) * EFI_PAGE_SIZE - CPU_STACK_ALIGNMENT);
+  TopOfStack = ALIGN_POINTER (TopOfStack, CPU_STACK_ALIGNMENT);
+
+  //
+  // End of PEI phase signal
+  //
+  Status = PeiServicesInstallPpi (&gEndOfPeiSignalPpi);
+  ASSERT_EFI_ERROR (Status);
+
+  //
+  // Update the contents of BSP stack HOB to reflect the real stack info passed to DxeCore.
+  //
+  UpdateStackHob ((EFI_PHYSICAL_ADDRESS)(UINTN)BaseOfStack, STACK_SIZE);
+
+  SwitchStack (
+    (SWITCH_STACK_ENTRY_POINT)(UINTN)DxeCoreEntryPoint,
+    HobList.Raw,
+    NULL,
+    TopOfStack
+    );
+}
-- 
2.27.0



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