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Rev 4016 Rev 4125
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        /* %ebx is defined to hold pcb_ptr - set it to 0 */
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        /* %ebx is defined to hold pcb_ptr - set it to 0 */
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        "xorl %%ebx, %%ebx\n"
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        "xorl %%ebx, %%ebx\n"
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        "iret\n"
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        "iret\n"
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        :
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        :
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        : [udata_des] "i" (selector(UDATA_DES) | PL_USER),
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        : [udata_des] "i" (gdtselector(UDATA_DES) | PL_USER),
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          [stack_size] "r" ((uint8_t *) kernel_uarg->uspace_stack + THREAD_STACK_SIZE),
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          [stack_size] "r" ((uint8_t *) kernel_uarg->uspace_stack + THREAD_STACK_SIZE),
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          [ipl] "r" (ipl),
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          [ipl] "r" (ipl),
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          [utext_des] "i" (selector(UTEXT_DES) | PL_USER),
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          [utext_des] "i" (gdtselector(UTEXT_DES) | PL_USER),
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          [entry] "r" (kernel_uarg->uspace_entry),
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          [entry] "r" (kernel_uarg->uspace_entry),
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          [uarg] "r" (kernel_uarg->uspace_uarg),
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          [uarg] "r" (kernel_uarg->uspace_uarg),
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          [tls_des] "r" (selector(TLS_DES))
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          [tls_des] "r" (gdtselector(TLS_DES))
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        : "eax");
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        : "eax");
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    /* Unreachable */
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    /* Unreachable */
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    while (1);
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    while (1);
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}
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}