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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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              "movq %0, %%rax;"            
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              "movq %0, %%rax;"            
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              "movq %1, %%rbx;"
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              "movq %1, %%rbx;"
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              "movq %2, %%rcx;"
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              "movq %2, %%rcx;"
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              "pushq %%rbx;"
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              "pushq %%rbx;"
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              "pushq %%rcx;"
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              "pushq %%rcx;"
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              "pushq %%rdx;"
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              "pushq %%rdx;"
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              "pushq %%rsi;"
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              "pushq %%rsi;"
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              "iretq;"
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              "iretq;"
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              : : "i" (gdtselector(UDATA_DES) | PL_USER), "i" (USTACK_ADDRESS+THREAD_STACK_SIZE), "r" (pri), "i" (gdtselector(UTEXT_DES) | PL_USER), "i" (UTEXT_ADDRESS));
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              : : "i" (gdtselector(UDATA_DES) | PL_USER), "i" (USTACK_ADDRESS+THREAD_STACK_SIZE), "r" (ipl), "i" (gdtselector(UTEXT_DES) | PL_USER), "i" (UTEXT_ADDRESS));
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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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}