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Dear All,

 

I am developing a KEXT for PCI device for Mac OS X 10.4.9 (ppc and intel) and stuck up while mapping device memory at user level. I searched all the older archives for this but could no where get the hint. Also, couldnot find any relevant sample for this. I hope you would please help me out in this matter.

 

Below is the piece of code that I wrote at kernel level. To allow user client to map hardware registers into my application, I am using IOConnectMapMemory. This API returns success, and I get an address corresponding to the same. But when i see the memory contents corresponding to it, it shows all values as AAAAAAAAA, AAAAAAA, i.e. it seems nothing is mapped.

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
#define super IOUserClient
OSDefineMetaClassAndStructors(MyDriver_drv_user, IOUserClient)

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
extern  IODeviceMemory *physicalMem;

IOReturn MyDriver_drv_user::clientMemoryForType(UInt32 type, IOOptionBits * options, IOMemoryDescriptor ** memory)
{
 physicalMem->map( fTask, kIOMapAnywhere, kIOMapAnywhere, 0, 0); if(!physicalMem) return -1;
 physicalMem->retain();
 *memory = physicalMem;
 return kIOReturnSuccess;
}

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
#define super IOService
OSDefineMetaClassAndStructors(MyDriver_drv, IOService)

 IOMemoryMap * fRegisterMap = NULL;
 IODeviceMemory *physicalMem = NULL;
 IOPCIDevice * fPCIDevice = NULL;
 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

bool MyDriver_drv::start(IOService * provider)
{
    if (!super::start(provider))
        return false;
 fPCIDevice = (IOPCIDevice *) provider;
  if(!fPCIDevice)
  return false;
    
   fPCIDevice->setMemoryEnable( true );
   fPCIDevice->setIOEnable( true );
   fRegisterMap = fPCIDevice->mapDeviceMemoryWithRegister(kIOPCIConfigBaseAddress2);
      
   if(fRegisterMap)
    {
     physicalMem = IODeviceMemory::withRange(fRegisterMap->getPhysicalAddress(),fRegisterMap->getLength());
     physicalMem->initWithPhysicalAddress(fRegisterMap->getPhysicalAddress(),fRegisterMap->getLength(), kIODirectionOutIn));
    }  
       
    registerService();
    return true;
}

Please let me know the fault with above piece of code and if possible, let me know the link of any sample application (if at all it exists)

Thanks and Regards,

Rohit Dhamija

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