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 * Change CPU protection level to 3, enter userspace.
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 * Change CPU protection level to 3, enter userspace.
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 *
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 *
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 */
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 */
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void userspace(void)
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void userspace(void)
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{
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{
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    pri_t pri;
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    ipl_t ipl;
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    pri = cpu_priority_high();
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    ipl = interrupts_disable();
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    __asm__ volatile (
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    __asm__ volatile (
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        /* CLNT */
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        /* CLNT */
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        "pushfl;"
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        "pushfl;"
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        "pop %%eax;"
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        "pop %%eax;"
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        "pushl %2\n"
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        "pushl %2\n"
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        "pushl %3\n"
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        "pushl %3\n"
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        "pushl %4\n"
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        "pushl %4\n"
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        "iret"
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        "iret"
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        :
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        :
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        : "i" (selector(UDATA_DES) | PL_USER), "r" (USTACK_ADDRESS+(THREAD_STACK_SIZE)), "r" (pri), "i" (selector(UTEXT_DES) | PL_USER), "i" (UTEXT_ADDRESS)
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        : "i" (selector(UDATA_DES) | PL_USER), "r" (USTACK_ADDRESS+(THREAD_STACK_SIZE)), "r" (ipl), "i" (selector(UTEXT_DES) | PL_USER), "i" (UTEXT_ADDRESS)
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        : "eax");
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        : "eax");
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    /* Unreachable */
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    /* Unreachable */
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    for(;;);
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    for(;;);
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}
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}