From 1828acbc561720ca953d6d595058d0c3134d210c Mon Sep 17 00:00:00 2001
From: Rafal Kupiec <belliash@codingworkshop.eu.org>
Date: Fri, 2 Feb 2024 22:10:51 +0100
Subject: [PATCH] Implement AcGetSMBiosTable() and AcGetSMBios3Table() routines

---
 sdk/xtdk/hltypes.h                 | 35 ++++++++++++++++
 xtldr/modules/acpi/acpi.c          | 64 ++++++++++++++++++++++++++++++
 xtldr/modules/acpi/includes/acpi.h |  8 ++++
 3 files changed, 107 insertions(+)

diff --git a/sdk/xtdk/hltypes.h b/sdk/xtdk/hltypes.h
index bfcee77..2160f46 100644
--- a/sdk/xtdk/hltypes.h
+++ b/sdk/xtdk/hltypes.h
@@ -142,6 +142,7 @@ typedef struct _CPPORT
     USHORT Flags;
 } CPPORT, *PCPPORT;
 
+/* HAL framebuffer data structure */
 typedef struct _HAL_FRAMEBUFFER_DATA
 {
     BOOLEAN Initialized;
@@ -154,4 +155,38 @@ typedef struct _HAL_FRAMEBUFFER_DATA
     UINT Pitch;
 } HAL_FRAMEBUFFER_DATA, *PHAL_FRAMEBUFFER_DATA;
 
+/* SMBIOS table header structure */
+typedef struct _SMBIOS_TABLE_HEADER
+{
+    UCHAR Signature[4];
+    UCHAR Checksum;
+    UCHAR Length;
+    UCHAR MajorVersion;
+    UCHAR MinorVersion;
+    USHORT MaxStructureSize;
+    UCHAR EntryPointRevision;
+    UCHAR Reserved[5];
+    UCHAR Signature2[5];
+    UCHAR IntermediateChecksum;
+    USHORT TableLength;
+    ULONG TableAddress;
+    USHORT NumberOfStructures;
+    UCHAR BcdRevision;
+} SMBIOS_TABLE_HEADER, *PSMBIOS_TABLE_HEADER;
+
+/* SMBIOS3 table header structure */
+typedef struct _SMBIOS3_TABLE_HEADER
+{
+    UCHAR Signature[5];
+    UCHAR Checksum;
+    UCHAR Length;
+    UCHAR MajorVersion;
+    UCHAR MinorVersion;
+    UCHAR DocRevision;
+    UCHAR EntryPointRevision;
+    UCHAR Reserved;
+    ULONG MaxStructureSize;
+    ULONGLONG TableAddress;
+} SMBIOS3_TABLE_HEADER, *PSMBIOS3_TABLE_HEADER;
+
 #endif /* __XTDK_HLTYPES_H */
diff --git a/xtldr/modules/acpi/acpi.c b/xtldr/modules/acpi/acpi.c
index 005870d..e1f922b 100644
--- a/xtldr/modules/acpi/acpi.c
+++ b/xtldr/modules/acpi/acpi.c
@@ -119,6 +119,70 @@ AcGetRsdpTable(OUT PVOID *AcpiTable)
     return STATUS_EFI_SUCCESS;
 }
 
+/**
+ * Gets SMBIOS from EFI system configuration
+ *
+ * @param SmBiosTable
+ *        Suplies a pointer to memory area where SMBIOS address will be stored.
+ *
+ * @return This routine returns a status code.
+ *
+ * @since XT 1.0
+ */
+XTCDECL
+EFI_STATUS
+AcGetSMBiosTable(OUT PVOID *SmBiosTable)
+{
+    EFI_GUID SmBiosGuid = EFI_CONFIG_TABLE_SMBIOS_TABLE_GUID;
+    PSMBIOS_TABLE_HEADER SmBios;
+    EFI_STATUS Status;
+
+    /* Get SMBIOS table from system configuration tables */
+    Status = XtLdrProtocol->Util.GetConfigurationTable(&SmBiosGuid, (PVOID)&SmBios);
+    if(Status != STATUS_EFI_SUCCESS || AcpChecksumTable(SmBios, SmBios->Length) != 0)
+    {
+        /* SMBIOS not found or checksum mismatch */
+        *SmBiosTable = NULL;
+        return STATUS_EFI_NOT_FOUND;
+    }
+
+    /* SMBIOS found, return success */
+    *SmBiosTable = SmBios;
+    return STATUS_EFI_SUCCESS;
+}
+
+/**
+ * Gets SMBIOS3 from EFI system configuration
+ *
+ * @param SmBiosTable
+ *        Suplies a pointer to memory area where SMBIOS3 address will be stored.
+ *
+ * @return This routine returns a status code.
+ *
+ * @since XT 1.0
+ */
+XTCDECL
+EFI_STATUS
+AcGetSMBios3Table(OUT PVOID *SmBiosTable)
+{
+    EFI_GUID SmBios3Guid = EFI_CONFIG_TABLE_SMBIOS3_TABLE_GUID;
+    PSMBIOS3_TABLE_HEADER SmBios;
+    EFI_STATUS Status;
+
+    /* Get SMBIOS3 table from system configuration tables */
+    Status = XtLdrProtocol->Util.GetConfigurationTable(&SmBios3Guid, (PVOID)&SmBios);
+    if(Status != STATUS_EFI_SUCCESS || AcpChecksumTable(SmBios, SmBios->Length) != 0)
+    {
+        /* SMBIOS3 not found or checksum mismatch */
+        *SmBiosTable = NULL;
+        return STATUS_EFI_NOT_FOUND;
+    }
+
+    /* SMBIOS3 found, return success */
+    *SmBiosTable = SmBios;
+    return STATUS_EFI_SUCCESS;
+}
+
 /**
  * Gets XSDP (ACPI 2.0) from EFI system configuration
  *
diff --git a/xtldr/modules/acpi/includes/acpi.h b/xtldr/modules/acpi/includes/acpi.h
index 19fa8bb..a49600c 100644
--- a/xtldr/modules/acpi/includes/acpi.h
+++ b/xtldr/modules/acpi/includes/acpi.h
@@ -26,6 +26,14 @@ XTCDECL
 EFI_STATUS
 AcGetRsdpTable(OUT PVOID *AcpiTable);
 
+XTCDECL
+EFI_STATUS
+AcGetSMBiosTable(OUT PVOID *SmBiosTable);
+
+XTCDECL
+EFI_STATUS
+AcGetSMBios3Table(OUT PVOID *SmBiosTable);
+
 XTCDECL
 EFI_STATUS
 AcGetXsdpTable(OUT PVOID *AcpiTable);