1 files changed, 77 insertions, 0 deletions
diff --git a/Silicon/Qualcomm/QualcommSiliconPkg/Library/QualcommSmemLib/QualcommSmemLibNull.c b/Silicon/Qualcomm/QualcommSiliconPkg/Library/QualcommSmemLib/QualcommSmemLibNull.c
new file mode 100644
index 0000000000..5fa6c50450
--- /dev/null
+++ b/Silicon/Qualcomm/QualcommSiliconPkg/Library/QualcommSmemLib/QualcommSmemLibNull.c
@@ -0,0 +1,77 @@
+/** @file
+  NULL implementation of the Qualcomm Shared Memory (SMEM) library.
+
+  All functions return safe default values suitable for platforms
+  where SMEM is not available.
+
+  Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.<BR>
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+  @par Glossary:
+    - SMEM - Shared Memory
+**/
+
+#include <Library/QualcommSmemLib.h>
+
+/**
+  Construct a SMEM host identifier.
+
+  @param[in]   ProcId   Processor ID (use QUALCOMM_SMEM_PROC_* macros).
+  @param[in]   ProcNum  Processor instance number.
+  @param[in]   PdNum    Protection-domain number.
+  @param[in]   Chiplet  Chiplet identifier.
+  @param[out]  Host     Output host identifier (must not be NULL).
+
+  @retval  EFI_UNSUPPORTED  Always returns unsupported in this NULL implementation.
+**/
+EFI_STATUS
+EFIAPI
+QualcommSmemHostId (
+  IN   UINT16              ProcId,
+  IN   UINT16              ProcNum,
+  IN   UINT16              PdNum,
+  IN   UINT16              Chiplet,
+  OUT  QUALCOMM_SMEM_HOST  *Host
+  )
+{
+  return EFI_UNSUPPORTED;
+}
+
+/**
+  Initialize the SMEM common core.
+
+  @retval  EFI_SUCCESS  Always returns success in this NULL implementation.
+**/
+EFI_STATUS
+EFIAPI
+QualcommSmemInit (
+  VOID
+  )
+{
+  return EFI_SUCCESS;
+}
+
+/**
+  Look up an existing SMEM item.
+
+  @param[in]   RemoteHost  Remote host for a host-pair partition, or
+                           QUALCOMM_SMEM_HOST_COMMON for the common partition.
+  @param[in]   Item        SMEM item ID.
+  @param[in]   Flags       Must be QUALCOMM_SMEM_FLAG_NONE.
+  @param[out]  ItemPtr     Pointer to item payload (must not be NULL).
+  @param[out]  ItemSize    Size of item payload in bytes (may be NULL).
+
+  @retval  EFI_NOT_FOUND  Always returns not found in this NULL implementation.
+**/
+EFI_STATUS
+EFIAPI
+QualcommSmemLookup (
+  IN      QUALCOMM_SMEM_HOST  RemoteHost,
+  IN      UINT16              Item,
+  IN      UINT32              Flags,
+  OUT     VOID                **ItemPtr,
+  OUT     UINTN               *ItemSize    OPTIONAL
+  )
+{
+  return EFI_NOT_FOUND;
+}