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Rev 2575 Rev 3222
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        "pushl %1\n"
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        "pushl %1\n"
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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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        "movl %5, %%eax\n"
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        "movl %5, %%eax\n"
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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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        "iret\n"
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        "iret\n"
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        :
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        :
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        : "i" (selector(UDATA_DES) | PL_USER),
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        : "i" (selector(UDATA_DES) | PL_USER),
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          "r" ((uint8_t *) kernel_uarg->uspace_stack +
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          "r" ((uint8_t *) kernel_uarg->uspace_stack +
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              THREAD_STACK_SIZE),
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              THREAD_STACK_SIZE),