Tips And Tricks To Recompile Kext For 64 Bti

1. Type mismatch. Check that IOPhysicalMymory differ for 32 and 64 bits.
Also. For 32 bits

CODE

if ( (UInt32) xferDataPtr & 0x01 )

For 64 bits

CODE

if ( (uintptr_t) xferDataPtr & 0x01 )

2. IOMallocContiguous is depricated
Leo codes

CODE

    _prdTable = (PRD *) IOMallocContiguous(
                        /* size  */ sizeof(PRD) * kATAMaxDMADesc, 
                        /* align */ 0x10000, 
                        /* phys  */ &_prdTablePhysical );

    if ( !_prdTable )
    {
        IOLog("%s: PRD table allocation failed\n", getName());
        return false;
    }
.........
bool AppleIntelPIIXPATA::freeDMAChannel( void )
{
    if ( _prdTable )
    {
        // make sure the engine is stopped.
        stopDMA();

        // free the descriptor table.
        IOFreeContiguous(_prdTable, sizeof(PRD) * kATAMaxDMADesc);
    }

    return true;
}

Snow codes

CODE

	
	_prdBuffer = IOBufferMemoryDescriptor::inTaskWithPhysicalMask(
		kernel_task,
		kIODirectionInOut | kIOMemoryPhysicallyContiguous,
		sizeof(PRD) * kATAMaxDMADesc,
		0xFFFF0000UL );
    
    if ( !_prdBuffer )
    {
        IOLog("%s: PRD buffer allocation failed\n", getName());
        return false;
    }
 	
	_prdBuffer->prepare ( );
	
	_prdTable			= (PRD *) _prdBuffer->getBytesNoCopy();
	_prdTablePhysical	= _prdBuffer->getPhysicalAddress();
............
bool AppleIntelPIIXPATA::freeDMAChannel( void )
{
    if ( _prdBuffer )
    {
        // make sure the engine is stopped.
        stopDMA();

        // free the descriptor table.
        _prdBuffer->complete();
        _prdBuffer->release();
        _prdBuffer = NULL;
        _prdTable = NULL;
        _prdTablePhysical = 0;
        
    }

    return true;
}

and a new declaration

CODE

#include <IOKit/IOBufferMemoryDescriptor.h>
.........
IOBufferMemoryDescriptor* _prdBuffer;

To be continued.
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please do continue

This post has been edited by codex: Apr 13 2010, 09:21 PM

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