函数源码

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source File:arch\x86\kernel\traps.c Create Date:2022-07-27 08:31:25
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dotraplinkage void
do_device_not_available(struct pt_regs *regs, long error_code)
{
    unsigned long cr0 = read_cr0();
 
    RCU_LOCKDEP_WARN(!rcu_is_watching(), "entry code didn't wake RCU");
 
#ifdef CONFIG_MATH_EMULATION
    if (!boot_cpu_has(X86_FEATURE_FPU) && (cr0 & X86_CR0_EM)) {
        struct math_emu_info info = { };
 
        cond_local_irq_enable(regs);
 
        info.regs = regs;
        math_emulate(&info);
        return;
    }
#endif
 
    /* This should not happen. */
    if (WARN(cr0 & X86_CR0_TS, "CR0.TS was set")) {
        /* Try to fix it up and carry on. */
        write_cr0(cr0 & ~X86_CR0_TS);
    } else {
        /*
         * Something terrible happened, and we're better off trying
         * to kill the task than getting stuck in a never-ending
         * loop of #NM faults.
         */
        die("unexpected #NM exception", regs, error_code);
    }
}