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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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 */
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/** @addtogroup ia32   
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/** @addtogroup ia32
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 * @{
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 * @{
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 */
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 */
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/** @file
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/** @file
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 */
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 */
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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(uspace_arg_t *kernel_uarg)
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void userspace(uspace_arg_t *kernel_uarg)
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{
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{
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    ipl_t ipl;
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    ipl = interrupts_disable();
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    ipl_t ipl = interrupts_disable();
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    asm volatile (
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    asm volatile (
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        /*
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        /*
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         * Clear nested task flag.
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         * Clear nested task flag.
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         */
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         */
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        "pushfl\n"
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        "pushfl\n"
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        "pop %%eax\n"
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        "pop %%eax\n"
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        "and $0xffffbfff, %%eax\n"
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        "and $0xffffbfff, %%eax\n"
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        "push %%eax\n"
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        "push %%eax\n"
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        "popfl\n"
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        "popfl\n"
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        /* Set up GS register (TLS) */
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        /* Set up GS register (TLS) */
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        "movl %6, %%gs\n"
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        "movl %[tls_des], %%gs\n"
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        "pushl %0\n"
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        "pushl %[udata_des]\n"
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        "pushl %1\n"
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        "pushl %[stack_size]\n"
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        "pushl %2\n"
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        "pushl %[ipl]\n"
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        "pushl %3\n"
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        "pushl %[utext_des]\n"
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        "pushl %4\n"
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        "pushl %[entry]\n"
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        "movl %5, %%eax\n"
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        "movl %[uarg], %%eax\n"
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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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        : "i" (selector(UDATA_DES) | PL_USER),
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        : [udata_des] "i" (selector(UDATA_DES) | PL_USER),
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          "r" ((uint8_t *) kernel_uarg->uspace_stack +
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          [stack_size] "r" ((uint8_t *) kernel_uarg->uspace_stack + THREAD_STACK_SIZE),
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              THREAD_STACK_SIZE),
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          "r" (ipl),
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          [ipl] "r" (ipl),
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          "i" (selector(UTEXT_DES) | PL_USER),
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          [utext_des] "i" (selector(UTEXT_DES) | PL_USER),
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          "r" (kernel_uarg->uspace_entry),
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          [entry] "r" (kernel_uarg->uspace_entry),
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          "r" (kernel_uarg->uspace_uarg),
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          [uarg] "r" (kernel_uarg->uspace_uarg),
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          "r" (selector(TLS_DES))
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          [tls_des] "r" (selector(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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    for(;;)
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    while (1);
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        ;
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}
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}
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/** @}
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/** @}
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 */
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 */