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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 amd64  
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/** @addtogroup amd64
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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_t ipl = interrupts_disable();
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    ipl = interrupts_disable();
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    /* Clear CF,PF,AF,ZF,SF,DF,OF */
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    /* Clear CF, PF, AF, ZF, SF, DF, OF */
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    ipl &= ~(0xcd4);
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    ipl &= ~(0xcd4);
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    asm volatile (""
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    asm volatile (
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              "pushq %0\n"
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            "pushq %[udata_des]\n"
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              "pushq %1\n"
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            "pushq %[stack_size]\n"
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              "pushq %2\n"
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            "pushq %[ipl]\n"
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              "pushq %3\n"
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            "pushq %[utext_des]\n"
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              "pushq %4\n"
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            "pushq %[entry]\n"
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              "movq %5, %%rax\n"
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            "movq %[uarg], %%rax\n"
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              /* %rdi is defined to hold pcb_ptr - set it to 0 */
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            /* %rdi is defined to hold pcb_ptr - set it to 0 */
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              "xorq %%rdi, %%rdi\n"
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            "xorq %%rdi, %%rdi\n"
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              "iretq\n"
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            "iretq\n"
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              : :
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              "i" (gdtselector(UDATA_DES) | PL_USER),
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            :: [udata_des] "i" (gdtselector(UDATA_DES) | PL_USER),
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              "r" (kernel_uarg->uspace_stack+THREAD_STACK_SIZE),
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               [stack_size] "r" (kernel_uarg->uspace_stack + THREAD_STACK_SIZE),
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              "r" (ipl),
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               [ipl] "r" (ipl),
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              "i" (gdtselector(UTEXT_DES) | PL_USER),
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               [utext_des] "i" (gdtselector(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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              : "rax"
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            : "rax"
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              );
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        );
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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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 */