RE: How can I test if a physical address is already mapped or not.

Oct. 18, 2011


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-----Original Message-----
From: kernelnewbies-bounces@kernelnewbies.org [mailto:kernelnewbies-
bounces@kernelnewbies.org] On Behalf Of StephanT
Sent: Tuesday, October 18, 2011 10:23 AM
To: kernelnewbies
Subject: Re: How can I test if a physical address is already mapped or not.
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When you say an access to physical address, how are you managing to
access the physical address directly?
Like this:
unsigned long    * const pReg = (unsigned long*) 0XC0000000 ;
printk( KERN_INFO"** read (%p) %08lX.\n", pReg, *pReg) ;
On any virtual memory processor I am aware of, the above will cause pReg to contain a virtual address, not a physical address.

Jeff Haran