diff options
Diffstat (limited to 'DynamicTablesPkg/Library/Common/SmbiosStringTableLib/SmbiosStringTableLib.c')
| -rw-r--r-- | DynamicTablesPkg/Library/Common/SmbiosStringTableLib/SmbiosStringTableLib.c | 227 |
1 files changed, 227 insertions, 0 deletions
diff --git a/DynamicTablesPkg/Library/Common/SmbiosStringTableLib/SmbiosStringTableLib.c b/DynamicTablesPkg/Library/Common/SmbiosStringTableLib/SmbiosStringTableLib.c new file mode 100644 index 0000000000..9eb4a7b22d --- /dev/null +++ b/DynamicTablesPkg/Library/Common/SmbiosStringTableLib/SmbiosStringTableLib.c @@ -0,0 +1,227 @@ +/** @file
+ SMBIOS String Table Helper
+
+ Copyright (c) 2022, Arm Limited. All rights reserved.<BR>
+
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+ @par Reference(s):
+ - DSP0134 - SMBIOS Specification Version 3.6.0, 2022-06-17
+**/
+
+#include <Library/BaseLib.h>
+#include <Library/BaseMemoryLib.h>
+#include <Library/DebugLib.h>
+#include <Library/MemoryAllocationLib.h>
+#include <Library/SmbiosStringTableLib.h>
+
+/** Add a string to the string table.
+
+ @param[in] StrTable Pointer to the string table
+ @param[in] Str Pointer to the string
+ @param[out] StrRef Optional pointer to retrieve the string field
+ reference of the string in the string table
+
+ @return EFI_SUCCESS Success
+ @return EFI_INVALID_PARAMETER Invalid string table pointer
+ @return EFI_BUFFER_TOO_SMALL Insufficient space to add string
+**/
+EFI_STATUS
+EFIAPI
+StringTableAddString (
+ IN STRING_TABLE *CONST StrTable,
+ IN CONST CHAR8 *Str,
+ OUT UINT8 *StrRef OPTIONAL
+ )
+{
+ UINTN StrLength;
+ STRING_ELEMENT *StrElement;
+
+ if ((StrTable == NULL) || (Str == NULL)) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ if (StrTable->StrCount >= StrTable->MaxStringElements) {
+ return EFI_BUFFER_TOO_SMALL;
+ }
+
+ StrLength = AsciiStrLen (Str);
+ if (StrLength == 0) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ // Update the string element
+ StrElement = &StrTable->Elements[StrTable->StrCount];
+ StrElement->StringLen = StrLength;
+ StrElement->String = Str;
+
+ // Update String table information
+ StrTable->TotalStrLen += StrLength;
+ StrTable->StrCount++;
+
+ // Return the index of the string in the string table if requested
+ if (StrRef != NULL) {
+ // Note: SMBIOS string field references start at 1. So, return the
+ // StrCount as the string reference after it is updated.
+ *StrRef = StrTable->StrCount;
+ }
+
+ return EFI_SUCCESS;
+}
+
+/** Returns the total size required to publish the strings to the SMBIOS
+ string area.
+
+ @param[in] StrTable Pointer to the string table
+
+ @return Total size required to publish the strings in the SMBIOS string area.
+**/
+UINTN
+EFIAPI
+StringTableGetStringSetSize (
+ IN STRING_TABLE *CONST StrTable
+ )
+{
+ if (StrTable == NULL) {
+ ASSERT (0);
+ return 0;
+ }
+
+ // See Section 6.1.3 Text strings, SMBIOS Specification Version 3.6.0
+ // - If the formatted portion of the structure contains string-reference
+ // fields and all the string fields are set to 0 (no string references),
+ // the formatted section of the structure is followed by two null (00h)
+ // BYTES.
+ // - Each string is terminated with a null (00h) BYTE
+ // - and the set of strings is terminated with an additional null (00h) BYTE.
+
+ // Therefore, if string count = 0, return 2
+ // if string count > 0, the string set size =
+ // StrTable->TotalStrLen (total length of the strings in the string table)
+ // + StrTable->StrCount (add string count to include '\0' for each string)
+ // +1 (an additional '\0' is required at the end of the string set).
+ return (StrTable->StrCount == 0) ? 2 :
+ (StrTable->TotalStrLen + StrTable->StrCount + 1);
+}
+
+/** Iterate through the string table and publish the strings in the SMBIOS
+ string area.
+
+ @param[in] StrTable Pointer to the string table
+ @param[in] SmbiosStringAreaStart Start address of the SMBIOS string area.
+ @param[in] SmbiosStringAreaSize Size of the SMBIOS string area.
+
+ @return EFI_SUCCESS Success
+ @return EFI_INVALID_PARAMETER Invalid string table pointer
+ @return EFI_BUFFER_TOO_SMALL Insufficient space to publish strings
+**/
+EFI_STATUS
+EFIAPI
+StringTablePublishStringSet (
+ IN STRING_TABLE *CONST StrTable,
+ IN CHAR8 *CONST SmbiosStringAreaStart,
+ IN CONST UINTN SmbiosStringAreaSize
+ )
+{
+ UINT8 Index;
+ STRING_ELEMENT *StrElement;
+ CHAR8 *SmbiosString;
+ UINTN BytesRemaining;
+ UINTN BytesCopied;
+
+ if ((StrTable == NULL) || (SmbiosStringAreaStart == NULL)) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ if (SmbiosStringAreaSize < StringTableGetStringSetSize (StrTable)) {
+ return EFI_BUFFER_TOO_SMALL;
+ }
+
+ SmbiosString = SmbiosStringAreaStart;
+ BytesRemaining = SmbiosStringAreaSize;
+
+ if (StrTable->StrCount == 0) {
+ // See Section 6.1.3 Text strings, SMBIOS Specification Version 3.6.0
+ // If the formatted portion of the structure contains string-reference
+ // fields and all the string fields are set to 0 (no string references),
+ // the formatted section of the structure is followed by two null (00h)
+ // BYTES.
+ *SmbiosString++ = '\0';
+ } else {
+ for (Index = 0; Index < StrTable->StrCount; Index++) {
+ StrElement = &StrTable->Elements[Index];
+ AsciiStrCpyS (SmbiosString, BytesRemaining, StrElement->String);
+
+ // See Section 6.1.3 Text strings, SMBIOS Specification Version 3.6.0
+ // - Each string is terminated with a null (00h) BYTE
+ // Bytes Copied = String length + 1 for the string NULL terminator.
+ BytesCopied = StrElement->StringLen + 1;
+ BytesRemaining -= BytesCopied;
+ SmbiosString += BytesCopied;
+ }
+ }
+
+ // See Section 6.1.3 Text strings, SMBIOS Specification Version 3.6.0
+ // - the set of strings is terminated with an additional null (00h) BYTE.
+ *SmbiosString = '\0';
+ return EFI_SUCCESS;
+}
+
+/** Initialise the string table and allocate memory for the string elements.
+
+ @param[in] StrTable Pointer to the string table
+ @param[in] MaxStringElements Maximum number of strings that the string
+ table can hold.
+
+ @return EFI_SUCCESS Success
+ @return EFI_INVALID_PARAMETER Invalid string table pointer
+ @return EFI_OUT_OF_RESOURCES Failed to allocate memory for string elements
+**/
+EFI_STATUS
+EFIAPI
+StringTableInitialize (
+ IN STRING_TABLE *CONST StrTable,
+ IN UINTN MaxStringElements
+ )
+{
+ STRING_ELEMENT *Elements;
+
+ if ((StrTable == NULL) || (MaxStringElements > MAX_UINT8)) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ ZeroMem (StrTable, sizeof (STRING_TABLE));
+
+ Elements = (STRING_ELEMENT *)AllocateZeroPool (
+ sizeof (STRING_ELEMENT) * MaxStringElements
+ );
+ if (Elements == NULL) {
+ return EFI_OUT_OF_RESOURCES;
+ }
+
+ StrTable->Elements = Elements;
+ StrTable->MaxStringElements = (UINT8)MaxStringElements;
+ return EFI_SUCCESS;
+}
+
+/** Free memory allocated for the string elements in the string table.
+
+ @param[in] StrTable Pointer to the string table
+
+ @return EFI_SUCCESS Success
+ @return EFI_INVALID_PARAMETER Invalid string table pointer or string elements
+**/
+EFI_STATUS
+EFIAPI
+StringTableFree (
+ IN STRING_TABLE *CONST StrTable
+ )
+{
+ if ((StrTable == NULL) || (StrTable->Elements == NULL)) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ FreePool (StrTable->Elements);
+ ZeroMem (StrTable, sizeof (STRING_TABLE));
+ return EFI_SUCCESS;
+}
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