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Re: How do I get physical address of my buffer

Hi all,

I tried the following but it still goes crash......

MyDesc = IOBufferMemoryDescriptor::withCapacity(kMyBufferSIze,
kIODirectionOut,
true);

MyVirAddr = MyDesc->getBytesNoCopy();

-> MyPhyAddr = MyDesc->getPhysicalAddress();

Could someone let me know the pointer that written about these issue ?

Best Regards,

Zak


at 02.2.12 19:01, Kazutaka 'Zak' Sawa wrote:
>Hi all,
>
># Sorry, I missed to send a mail > admin-san
>
>How do I get physical address of my buffer created by
>IOBufferMemoryDescriptor ?
>
>My current code is the followings. This is called at my start method.
> If my driver calls getPhysicalAddress (both), kernel crash is
>occurred. What should I do before I call getPhysicalAddress ?
>
>
> MyDesc = IOBufferMemoryDescriptor::withCapacity(kMyBufferSIze,
> kIODirectionOut,
> true);
>
> MyMap = MyDesc->map(kIOMapAnywhere
> | kIOMapInhibitCache);
>
> MyVirAddr = MyMap->getVirtualAddress();
>
>-> MyPhyAddr = MyMap->getPhysicalAddress();
>-> MyPhyAddr = MyDesc->getPhysicalAddress();
>
># I test MyMap-> and MyDesc-> but both cause kernel crash...
>
>
>Regards,
>
>Zak
>
><<<< Kazutaka Sawa * yano ELECTRIC CO.,LTD.* >>>>
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<<<< Kazutaka Sawa * yano ELECTRIC CO.,LTD.* >>>>
<<<< >>>>
<<<< E-Mail. mailto:email@hidden >>>>
<<<< URL. http://www.yano-el.co.jp/ >>>>
<<<< Tel. +81-78-993-0001 Fax. +81-78-997-6491 >>>>
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References: 
 >How do I get physical address of my buffer (From: "Kazutaka 'Zak' Sawa" <email@hidden>)



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