Linux 下如何禁用CPU cache

The code of the module:

Code:

#include <linux/init.h>
#include <linux/module.h>
MODULE_LICENSE("Dual BSD/GPL");
static int disableCache_init(void)
{
printk(KERN_ALERT "Disabling L1 and L2 caches.\n");
__asm__(".intel_syntax noprefix\n\t"
"mov    eax,cr0\n\t"
"or     eax,(1 << 30)\n\t"
"mov    cr0,eax\n\t"
"wbinvd\n\t"
".att_syntax noprefix\n\t"
: : : "eax" );
return 0;
}
static void disableCache_exit(void)
{
printk(KERN_ALERT "Enabling L1 and L2 caches.\n");
__asm__(".intel_syntax noprefix\n\t"
"mov    eax,cr0\n\t"
"and     eax,~(1 << 30)\n\t"
"mov    cr0,eax\n\t"
"wbinvd\n\t"
".att_syntax noprefix\n\t"
: : : "eax" );
}
module_init(disableCache_init);
module_exit(disableCache_exit);

And the Makefile:

Code:

EXTRA_CFLAGS = -m32
obj-m += disableCache.o

all:
make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules

insmod command:

Code:

sudo insmod ./disableCache.ko

如果是64位系统，则make file中 -m32 改为-m64同时code 中所有的eax改为rax.