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unsigned int clear_and_return_cr0(void)
{
unsigned int cr0 = 0;
unsigned int ret;
asm("movl %%cr0, %%eax":"=a"(cr0)); //这行报错
ret = cr0;
printk("cr0 = %d\n",ret);
cr0 &= 0xfffeffff;
asm("movl %%eax, %%cr0"::"a"(cr0)); //这行报错
return ret;
}
obj-m := mycall.o
KERNEL_VER = $(shell uname -r)
PWD := $(shell pwd)
build: kernel_modules
kernel_modules:
make -C /lib/modules/$(KERNEL_VER)/build M=$(PWD) modules
clean:
make -C /lib/modules/$(KERNEL_VER)/build M=$(PWD) clean