2007/3/24, Venkatesh Srinivas <me@xxxxxxxxxxx>:
On Sat, Mar 24, 2007 at 06:13:50PM +0100, ninjaboy wrote:
>hi,
>when I load a module and in this module there is:
>unsigned long cr3;
>asm("xor %%rbx, %%rbx\t\nmov %%cr3, %0" : "=b" (cr3));
>what cr3 is? insmod in userspace or cr3 in kernel space?
CR3 is a register on x86 and x86-64 chips, that points to the page
directory (highest level page table) for the current process.
Yes, i know, but on SMP i try to load and remove the module more time
and it's the dmesg output
[*] CPU: 1
[*] CR3: 0000000020421000
Cleaning Up.
[*] CPU: 1
[*] CR3: 000000002613c000
Cleaning Up.
[*] CPU: 0
[*] CR3: 000000000e188000
Cleaning Up.
[*] CPU: 0
[*] CR3: 00000000261d6000
the addrs change for the same CPU too, why?
thanks
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