27c27,28
< 
---
> #include "vrom.h"
> #include "vrom_table.h"
44d44
< 
1109a1110,1182
> 
>   // 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;