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[Xen-devel] Problem with modify CR0 of xen kernel

To: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-devel] Problem with modify CR0 of xen kernel
From: errik <waitingfor2009marry@xxxxxxxxx>
Date: Sun, 13 Dec 2009 16:44:21 +0800
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Hi All,
   This is a function of a kernel module, but when I calls this function, a segment fault error happens, I don't know why because the code works well on other types of kernel such as PAE and default.
 unsigned long clear_and_return_cr0(void)
    unsigned long cr0 = 0;
    unsigned long ret;
#ifdef X86_64
    __asm__ __volatile("movq %%cr0, %%rax" : "=a"(cr0));
    ret = cr0;
    cr0 &= 0xfffffffffffeffff;
    __asm__ __volatile__("movq %%rax, %%cr0" : : "a"(cr0));
    __asm__ __volatile("mov %%cr0, %%eax" : "=a"(cr0));
    ret = cr0;
    cr0 &= 0xfffeffff;
    __asm__ __volatile__("mov %%eax, %%cr0" : : "a"(cr0));
    return ret;
May anyone give me some suggestions?
Thanks a lot!
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