[edk2-devel] [PATCH] UefiPayloadPkg/BlSupportDxe: Use EfiSmbiosProtocol to install tables

[Patrick Rudolph]

The default EfiSmbiosProtocol operates on an empty SMBIOS table.
As the SMBIOS tables are provided by the bootloader, install the
SMBIOS tables using the EfiSmbiosProtocol.

This fixes the settings menu not showing any hardware information, instead
only "0 MB RAM" was displayed.

Tests showed that the OS can still see the SMBIOS tables.

Signed-off-by: Patrick Rudolph <patrick.rudolph at 9elements.com>
---
 UefiPayloadPkg/BlSupportDxe/BlSupportDxe.c   | 111 +++++++++++++++++++-
 UefiPayloadPkg/BlSupportDxe/BlSupportDxe.h   |   3 +
 UefiPayloadPkg/BlSupportDxe/BlSupportDxe.inf |   5 +-
 3 files changed, 115 insertions(+), 4 deletions(-)

diff --git a/UefiPayloadPkg/BlSupportDxe/BlSupportDxe.c b/UefiPayloadPkg/BlSupportDxe/BlSupportDxe.c
index a746d0581e..db478c1abc 100644
--- a/UefiPayloadPkg/BlSupportDxe/BlSupportDxe.c
+++ b/UefiPayloadPkg/BlSupportDxe/BlSupportDxe.c
@@ -79,6 +79,107 @@ ReserveResourceInGcd (
   return Status;
 }
 
+EFI_STATUS
+EFIAPI
+BlDxeInstallSMBIOStables(
+  IN UINT64    SmbiosTableBase,
+  IN UINT32    SmbiosTableSize
+)
+{
+  EFI_STATUS                    Status;
+  SMBIOS_TABLE_ENTRY_POINT      *SmbiosTable;
+  SMBIOS_TABLE_3_0_ENTRY_POINT  *Smbios30Table;
+  SMBIOS_STRUCTURE_POINTER      Smbios;
+  SMBIOS_STRUCTURE_POINTER      SmbiosEnd;
+  CHAR8                         *String;
+  EFI_SMBIOS_HANDLE             SmbiosHandle;
+  EFI_SMBIOS_PROTOCOL           *SmbiosProto;
+
+  //
+  // Locate Smbios protocol.
+  //
+  Status = gBS->LocateProtocol (&gEfiSmbiosProtocolGuid, NULL, (VOID **)&SmbiosProto);
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_ERROR, "%a: Failed to locate gEfiSmbiosProtocolGuid\n",
+      __FUNCTION__));
+    return Status;
+  }
+
+  Smbios30Table = (SMBIOS_TABLE_3_0_ENTRY_POINT *)(UINTN)(SmbiosTableBase);
+  SmbiosTable = (SMBIOS_TABLE_ENTRY_POINT *)(UINTN)(SmbiosTableBase);
+
+  if (CompareMem (Smbios30Table->AnchorString, "_SM3_", 5) == 0) {
+    Smbios.Hdr = (SMBIOS_STRUCTURE *) (UINTN) Smbios30Table->TableAddress;
+    SmbiosEnd.Raw = (UINT8 *) (UINTN) (Smbios30Table->TableAddress + Smbios30Table->TableMaximumSize);
+    if (Smbios30Table->TableMaximumSize > SmbiosTableSize) {
+      DEBUG((DEBUG_INFO, "%a: SMBIOS table size greater than reported by bootloader\n",
+        __FUNCTION__));
+    }
+  } else if (CompareMem (SmbiosTable->AnchorString, "_SM_", 4) == 0) {
+    Smbios.Hdr    = (SMBIOS_STRUCTURE *) (UINTN) SmbiosTable->TableAddress;
+    SmbiosEnd.Raw = (UINT8 *) ((UINTN) SmbiosTable->TableAddress + SmbiosTable->TableLength);
+
+    if (SmbiosTable->TableLength > SmbiosTableSize) {
+      DEBUG((DEBUG_INFO, "%a: SMBIOS table size greater than reported by bootloader\n",
+        __FUNCTION__));
+    }
+  } else {
+    DEBUG ((DEBUG_ERROR, "%a: No valid SMBIOS table found\n", __FUNCTION__ ));
+    return EFI_NOT_FOUND;
+  }
+
+  do {
+    // Check for end marker
+    if (Smbios.Hdr->Type == 127) {
+      break;
+    }
+
+    // Install the table
+    SmbiosHandle = SMBIOS_HANDLE_PI_RESERVED;
+    Status = SmbiosProto->Add (
+                          SmbiosProto,
+                          gImageHandle,
+                          &SmbiosHandle,
+                          Smbios.Hdr
+                          );
+    ASSERT_EFI_ERROR (Status);
+    if (EFI_ERROR (Status)) {
+      return Status;
+    }
+    //
+    // Go to the next SMBIOS structure. Each SMBIOS structure may include 2 parts:
+    // 1. Formatted section; 2. Unformatted string section. So, 2 steps are needed
+    // to skip one SMBIOS structure.
+    //
+
+    //
+    // Step 1: Skip over formatted section.
+    //
+    String = (CHAR8 *) (Smbios.Raw + Smbios.Hdr->Length);
+
+    //
+    // Step 2: Skip over unformatted string section.
+    //
+    do {
+      //
+      // Each string is terminated with a NULL(00h) BYTE and the sets of strings
+      // is terminated with an additional NULL(00h) BYTE.
+      //
+      for ( ; *String != 0; String++) {
+      }
+
+      if (*(UINT8*)++String == 0) {
+        //
+        // Pointer to the next SMBIOS structure.
+        //
+        Smbios.Raw = (UINT8 *)++String;
+        break;
+      }
+    } while (TRUE);
+  } while (Smbios.Raw < SmbiosEnd.Raw);
+
+  return EFI_SUCCESS;
+}
 
 /**
   Main entry for the bootloader support DXE module.
@@ -133,9 +234,13 @@ BlDxeEntryPoint (
   // Install Smbios Table
   //
   if (SystemTableInfo->SmbiosTableBase != 0 && SystemTableInfo->SmbiosTableSize != 0) {
-    DEBUG ((DEBUG_ERROR, "Install Smbios Table at 0x%lx, length 0x%x\n", SystemTableInfo->SmbiosTableBase, SystemTableInfo->SmbiosTableSize));
-    Status = gBS->InstallConfigurationTable (&gEfiSmbiosTableGuid, (VOID *)(UINTN)SystemTableInfo->SmbiosTableBase);
-    ASSERT_EFI_ERROR (Status);
+    DEBUG ((DEBUG_ERROR, "Install Smbios Table at 0x%lx, length 0x%x\n",
+      SystemTableInfo->SmbiosTableBase, SystemTableInfo->SmbiosTableSize));
+
+    if (BlDxeInstallSMBIOStables(SystemTableInfo->SmbiosTableBase, SystemTableInfo->SmbiosTableSize) != EFI_SUCCESS) {
+      Status = gBS->InstallConfigurationTable (&gEfiSmbiosTableGuid, (VOID *)(UINTN)SystemTableInfo->SmbiosTableBase);
+      ASSERT_EFI_ERROR (Status);
+    }
   }
 
   //
diff --git a/UefiPayloadPkg/BlSupportDxe/BlSupportDxe.h b/UefiPayloadPkg/BlSupportDxe/BlSupportDxe.h
index 512105fafd..a5216cd2e9 100644
--- a/UefiPayloadPkg/BlSupportDxe/BlSupportDxe.h
+++ b/UefiPayloadPkg/BlSupportDxe/BlSupportDxe.h
@@ -10,6 +10,8 @@ SPDX-License-Identifier: BSD-2-Clause-Patent
 
 #include <PiDxe.h>
 
+#include <Protocol/Smbios.h>
+
 #include <Library/UefiDriverEntryPoint.h>
 #include <Library/UefiBootServicesTableLib.h>
 #include <Library/DxeServicesTableLib.h>
@@ -26,5 +28,6 @@ SPDX-License-Identifier: BSD-2-Clause-Patent
 #include <Guid/GraphicsInfoHob.h>
 
 #include <IndustryStandard/Acpi.h>
+#include <IndustryStandard/SmBios.h>
 
 #endif
diff --git a/UefiPayloadPkg/BlSupportDxe/BlSupportDxe.inf b/UefiPayloadPkg/BlSupportDxe/BlSupportDxe.inf
index cebc811355..d26a75248b 100644
--- a/UefiPayloadPkg/BlSupportDxe/BlSupportDxe.inf
+++ b/UefiPayloadPkg/BlSupportDxe/BlSupportDxe.inf
@@ -56,5 +56,8 @@
   gEfiMdePkgTokenSpaceGuid.PcdPciExpressBaseAddress
   gEfiMdePkgTokenSpaceGuid.PcdPciExpressBaseSize
 
+[Protocols]
+  gEfiSmbiosProtocolGuid
+
 [Depex]
-  TRUE
+  gEfiSmbiosProtocolGuid
-- 
2.26.2



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