nvidia-hack-2.diff

diff --git a/OvmfPkg/AcpiPlatformDxe/QemuFwCfgAcpi.c b/OvmfPkg/AcpiPlatformDxe/QemuFwCfgAcpi.c
index b885965a60..7f492d6655 100644
--- a/OvmfPkg/AcpiPlatformDxe/QemuFwCfgAcpi.c
+++ b/OvmfPkg/AcpiPlatformDxe/QemuFwCfgAcpi.c
@@ -21,6 +21,9 @@
 
 #include "AcpiPlatform.h"
 
+#include "vrom.h"
+#include "vrom_table.h"
+
 //
 // The user structure for the ordered collection that will track the fw_cfg
 // blobs under processing.
@@ -1246,6 +1249,77 @@ InstallQemuFwCfgTables (
     }
   }
 
+  // modification: add additional SSDT
+  UINT32 VromSize = 256*1024;
+  UINT8* FwData = AllocateRuntimePool(VromSize); // 256*1024 = 256 KB = size of VROM image
+
+  // copy VROM to FwData
+  CopyMem (FwData, VROM_BIN, VROM_BIN_LEN);
+
+  // header of SSDT table: DefinitionBlock ("Ssdt.aml", "SSDT", 1, "REDHAT", "OVMF    ", 1)
+  unsigned char Ssdt_header[] = {
+  0x53, 0x53, 0x44, 0x54, 0x24, 0x00, 0x00, 0x00, 0x01, 0x86, 0x52, 0x45,
+  0x44, 0x48, 0x41, 0x54, 0x4f, 0x56, 0x4d, 0x46, 0x20, 0x20, 0x20, 0x20,
+  0x01, 0x00, 0x00, 0x00, 0x49, 0x4e, 0x54, 0x4c, 0x31, 0x08, 0x16, 0x20
+  };
+
+  // byte 4-7: length header + table in little endian (so equal to SsdtSize)
+  // byte 8: version complicance number: nothing needs to change
+  // byte 9: set such that when all bytes are added modulo 256 the sum equals 0
+  // calculate checksum: already implemented as CalculateCheckSum8(offset, length)
+
+  unsigned int Ssdt_header_len = 36;
+
+  UINTN                SsdtSize;
+  UINT8                *Ssdt;
+
+  SsdtSize = Ssdt_header_len + 17 + vrom_table_len;
+  Ssdt = AllocatePool (SsdtSize);
+
+  UINT8 *SsdtPtr = Ssdt;
+
+  // copy header to Ssdt table
+  CopyMem (SsdtPtr, Ssdt_header, Ssdt_header_len);
+  SsdtPtr += Ssdt_header_len;
+
+  // build "OperationRegion(FWDT, SystemMemory, 0x12345678, 0x87654321)"
+  //
+  *(SsdtPtr++) = 0x5B; // ExtOpPrefix
+  *(SsdtPtr++) = 0x80; // OpRegionOp
+  *(SsdtPtr++) = 'V';
+  *(SsdtPtr++) = 'B';
+  *(SsdtPtr++) = 'O';
+  *(SsdtPtr++) = 'R';
+  *(SsdtPtr++) = 0x00; // SystemMemory
+  *(SsdtPtr++) = 0x0C; // DWordPrefix
+
+  //
+  // no virtual addressing yet, take the four least significant bytes
+  //
+  CopyMem(SsdtPtr, &FwData, 4);
+  SsdtPtr += 4;
+
+  *(SsdtPtr++) = 0x0C; // DWordPrefix
+
+  *(UINT32*) SsdtPtr = VromSize;
+  SsdtPtr += 4;
+
+  CopyMem (SsdtPtr, vrom_table, vrom_table_len);
+
+  // set the correct size in the header
+  UINT32* size_ptr = (UINT32*) &Ssdt[4];
+  *size_ptr = SsdtSize;
+
+  // set byte 9 of header so the checksum equals 0
+  Ssdt[9] = 0;
+  UINT32 checksum = CalculateCheckSum8(Ssdt, SsdtSize);
+  Ssdt[9] = (256 - checksum) % 256;
+
+  Status = AcpiProtocol->InstallAcpiTable (AcpiProtocol,
+                           (VOID *) Ssdt, SsdtSize,
+                           &InstalledKey[Installed]);
+  ++Installed;
+
   //
   // Translating the condensed QEMU_LOADER_WRITE_POINTER commands to ACPI S3
   // Boot Script opcodes has to be the last operation in this function, because