IOCTL from 64b user space

[jfaslist]

Hi,
I am using a Maple platform.
I have written a driver which ioctl entry point expects a structure 
passed from a 64b user space program. The driver is passed the structure 
address in the "arg" argument:

int (*ioctl) (struct inode *inode, struct file *filp,
              unsigned int cmd, unsigned long arg);

But in my driver when I look at the address of that structure (prior to 
doing a copy_from_user ) , I see the address is "0". the "cmd" ioctl 
code is correct though.
Question: can I have 64b apps making ioctl calls? or do I have to use 
only 32b apps and use the ioctl32.c scheme, like on Sparc64?

Sorry for what is likely a basic question.
Thanks
-jf simon


	

	
		
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