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From: blk5743 AT yahoo DOT com DOT tw
Newsgroups: comp.os.msdos.djgpp
Subject: Re: code from BC31(16bits) to DJGPP(32 bits)
Date: 28 Nov 2005 19:27:44 -0800
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hello, this is my code of BC++ 31
i need to convert these code to DJGPP
i must know physical address of structrues and buffer which i must
assign to BIOS/INT call.
i do not know how can i get really address for these call that i can
use FP_SEG,FP_OFF in BC++ 31


#define TOTAL_REGIONS   12
//
// VDS DMA Descriptor Data Structure
typedef struct
{
    ULONG RegionSize;                   // DDS region size
    ULONG Offset;                       // DDS region offset
    WORD Segment;                       // DDS region segement
    WORD BufferID;                      // to be filled by VDS
    ULONG PhysicalAddr;                 // to be filled by VDS
} DDS;
//
// VDS EDDS Region Data Structure
typedef struct
{
    ULONG PhysicalAddr;
    ULONG Size;
} REGION;
//
// VDS Extended DMA Descriptor Data Structure
typedef struct
{
    ULONG RegionSize;      // Size of the region
    ULONG Offset;          // Offset
    ULONG Segment;         // Segment, the upper 16 bits must be 0.
    WORD NumberAvail;      // number of region available
    WORD NumberUsed;       // number of region used, to be filled by
VDS
    REGION Region[TOTAL_REGIONS];   // physical regions, to be filled
by VDS
} EDDS;
//
//  PRD Table Structure
typedef struct              // Physical Region Descriptor
{
        ULONG BaseAddr;        // Region base address
    WORD ByteCount;        // Region size
        WORD EOT;               // End of Table
} PRD_T;
//
typedef union
{
        ULONG addr;
        WORD addr_word[2];
} PRD_T_A;
BYTE far *r_buffer;
int LockDMARegion(ULONG size)
{
    // Construct the EDDS table.
    PRD_EDDS.RegionSize = size;
    PRD_EDDS.Offset = FP_OFF(r_buffer);
    PRD_EDDS.Segment = FP_SEG(r_buffer);
    PRD_EDDS.NumberAvail = TOTAL_REGIONS;

    _DI = (WORD)(&PRD_EDDS);
    asm{
      push es
	  mov ax, ds
      mov es, ax        // ES:DI points to PRD_EDDS
      mov dx, 0         // DX = 0 as we does not use page-table EDDS
      mov ax, 8105h     // Scatter/Gather Lock Region request
      int 4bh
      pop es
      jnc LockRegionOK
    }
    return 1;           // Scatter/Gather Lock Region request failed.

LockRegionOK:
    return 0;           // Scatter/Gather Lock Region request OK.
}
int Lock_PRD()
{
    if((*VDS_Exist) & 0x20)
    {
      if(PRD_DDS.BufferID == 0)
	  {
        PRD_DDS.RegionSize = sizeof(PRD_Pool);
        PRD_DDS.Offset = (WORD)(PRD_Table);
        PRD_DDS.Segment = _DS;
        _DI = (WORD)(&PRD_DDS);
        asm{
          push es
          mov ax, ds
          mov es, ax          // ES:DI points to PRD_DDS
                  mov dx, 3ch
          mov ax, 8103h
          int 4bh             // VDS: Lock DMA Buffer Region
          pop es
          jnc Lock_DDS_OK
        }
        return 1;
      }

    Lock_DDS_OK:
	  PRD_Addr.addr = PRD_DDS.PhysicalAddr;
    }
    else // VDS not exist
      PRD_Addr.addr = ((ULONG)(_DS)<<4) + (WORD)(PRD_Table);
    return 0;
}