Subversion Repositories HelenOS

Rev

Rev 3222 | Go to most recent revision | Show entire file | Ignore whitespace | Details | Blame | Last modification | View Log | RSS feed

Rev 3222 Rev 4017
Line 24... Line 24...
24
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
 */
27
 */
28
 
28
 
29
/** @addtogroup amd64  
29
/** @addtogroup amd64
30
 * @{
30
 * @{
31
 */
31
 */
32
/** @file
32
/** @file
33
 */
33
 */
34
 
34
 
Line 45... Line 45...
45
 * Change CPU protection level to 3, enter userspace.
45
 * Change CPU protection level to 3, enter userspace.
46
 *
46
 *
47
 */
47
 */
48
void userspace(uspace_arg_t *kernel_uarg)
48
void userspace(uspace_arg_t *kernel_uarg)
49
{
49
{
50
    ipl_t ipl;
50
    ipl_t ipl = interrupts_disable();
51
   
51
   
52
    ipl = interrupts_disable();
-
 
53
 
-
 
54
    /* Clear CF,PF,AF,ZF,SF,DF,OF */
52
    /* Clear CF, PF, AF, ZF, SF, DF, OF */
55
    ipl &= ~(0xcd4);
53
    ipl &= ~(0xcd4);
56
 
54
   
57
    asm volatile (""
55
    asm volatile (
58
              "pushq %0\n"
56
            "pushq %[udata_des]\n"
59
              "pushq %1\n"
57
            "pushq %[stack_size]\n"
60
              "pushq %2\n"
58
            "pushq %[ipl]\n"
61
              "pushq %3\n"
59
            "pushq %[utext_des]\n"
62
              "pushq %4\n"
60
            "pushq %[entry]\n"
63
              "movq %5, %%rax\n"
61
            "movq %[uarg], %%rax\n"
-
 
62
           
64
              /* %rdi is defined to hold pcb_ptr - set it to 0 */
63
            /* %rdi is defined to hold pcb_ptr - set it to 0 */
65
              "xorq %%rdi, %%rdi\n"
64
            "xorq %%rdi, %%rdi\n"
66
              "iretq\n"
65
            "iretq\n"
67
              : :
-
 
68
              "i" (gdtselector(UDATA_DES) | PL_USER),
66
            :: [udata_des] "i" (gdtselector(UDATA_DES) | PL_USER),
69
              "r" (kernel_uarg->uspace_stack+THREAD_STACK_SIZE),
67
               [stack_size] "r" (kernel_uarg->uspace_stack + THREAD_STACK_SIZE),
70
              "r" (ipl),
68
               [ipl] "r" (ipl),
71
              "i" (gdtselector(UTEXT_DES) | PL_USER),
69
               [utext_des] "i" (gdtselector(UTEXT_DES) | PL_USER),
72
              "r" (kernel_uarg->uspace_entry),
70
               [entry] "r" (kernel_uarg->uspace_entry),
73
              "r" (kernel_uarg->uspace_uarg)
71
               [uarg] "r" (kernel_uarg->uspace_uarg)
74
              : "rax"
72
            : "rax"
75
              );
73
        );
76
   
74
   
77
    /* Unreachable */
75
    /* Unreachable */
78
    for(;;)
76
    while (1);
79
        ;
-
 
80
}
77
}
81
 
78
 
82
/** @}
79
/** @}
83
 */
80
 */