Getting Physical address in User Mode?

marudhu · 02-18-2004, 05:57 PM

How to get physical address of a pointer in a user mode application ?. Anything can be done with /dev/mem ?.

jinksys · 02-19-2004, 01:13 AM

Are you talking about finding the address that a pointer resides at? If so, you can find it out with C like so,

Code:

#include <stdio.h>

void main()
{
int *p;
printf("Address of pointer p is:%p",&p);
}

cjcuk · 02-19-2004, 02:57 AM

Quote:

Originally posted by jinksys
Are you talking about finding the address that a pointer resides at? If so, you can find it out with C like so,

Code:

#include <stdio.h> void main() { int *p; printf("Address of pointer p is:%p",&p); }

No, he is referring to physical addresses. He wants to know where in the actual memory address his virtual memory mapping equates to.

Marudhu: I'll look into this when I get back from University today, if you do not already have a solution by then.

Marius2 · 02-19-2004, 09:12 AM

May I ask why you want to get the physical adress of your pointer? You
should be able to access all of your code/data via logical adresses (of
which your application knows nothing), and you shouldn't want to access
other portions of the memory - any code I can think of which does that
would be called malicious.

marudhu · 02-23-2004, 02:36 PM

I require this for a bios SMI function call argument. I guess , I can access any of memory in bios SMM mode.