I'm trying to enable the SSE2 extensions in Mandrake Linux 8.1. I thought
since the only way to do this is in ring 0 to write a module for it, and
here's my code below... I'm trying to run it on an AMD k7 wihich doesn't
have SSE2 support to test it before I bring it to aproduction pentium
server, but it only crashes my machine when I try to write cr0 back..
any ideas? is there some code that enables sse2 already?
Here's my code:
#define MODULE
#include <linux/module.h>
int init_module(void){
__asm__ __volatile__ ("movl %%cr0, %%eax" : "=a"(cr0));
__asm__ __volatile__("andl $0xFFFB, %eAX");
__asm__ __volatile__ ("movl %eax, %cr0");
__asm__ __volatile__ ("movl %%cr4, %%eax" : "=a"(cr0));
__asm__ __volatile__("andl $0x0600, %eAX");
__asm__ __volatile__ ("movl %eax, %cr4");
return 0;
}
void cleanup_module(void) {printk("<1>goodbye"); }
Thanks, any help would be appreciated.
David
----
David Yang
UIUC Electrical Engineering 2004
http://www.ews.uiuc.edu/~dgyang
dgyang@uiuc.edu
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