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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: 29 Nov 2005 20:02:24 -0800
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? *VDS_Exist;  => check virtual DMA Service
? PRD_Pool; just a pool for cache data, define as char PRD_POOL[96*8]

yes, i want to

1) allocate XMS
2) set DMA to XMS
3) read CD
4) move DMA data to program

r_buffer just declare in program.
according to your clear explan.
it should at physical __djgpp_conventional_base+&r_buffer
it seems need not to allocate a DOS buffer to R/W data because buffer
above 1M+64K can do
Therefore, what i need to do is that

1. allocate XMS(AH 09 ) and lock the region(AH 0C),
    i will get a XMS Block Address: ulXMSBlockAddr = (DX<<4+BX) or
should be (DX<<16+BX)????
2. set the region to PRD data for DMA transfer use
    a. if VDS exist => SCATTER/GATHER LOCK REGION
        PRD_EDDS.Offset = __djgpp_conventional_base+&r_buffer,
PRD_EDDS.Segment = 0;???
        AX=8105, int 4b
    b. if VDS exist => LOCK DMA REGION
        PRD_DDS.Segment = 0;//????
        PRD_DDS.Offset =(ULONG)PRD_Table+__djgpp_conventional_base;
        AX=8103, int 4b
        get PRD_Addr.addr = PRD_DDS.PhysicalAddr;
        else //no VDS
            PRD_Addr.addr = ulXMSBlockAddr ;
3. enable bus master function and send Read command to CD
    set PRD_Addr.addr to Bus Master registers and enable
4. copy data from XMS region
    if VDS exist
        directly get data from r_buffer
    else
        use dosmemget to get data(copy XMS to r_buffer)

Dear Rod Pemberton
i can give you part of BC31 sample code if you have interesting