Subversion Repositories HelenOS-historic

Rev

Rev 1078 | Rev 1119 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
257 palkovsky 1
/*
2
 * Copyright (C) 2005 Ondrej Palkovsky
3
 * All rights reserved.
4
 *
5
 * Redistribution and use in source and binary forms, with or without
6
 * modification, are permitted provided that the following conditions
7
 * are met:
8
 *
9
 * - Redistributions of source code must retain the above copyright
10
 *   notice, this list of conditions and the following disclaimer.
11
 * - Redistributions in binary form must reproduce the above copyright
12
 *   notice, this list of conditions and the following disclaimer in the
13
 *   documentation and/or other materials provided with the distribution.
14
 * - The name of the author may not be used to endorse or promote products
15
 *   derived from this software without specific prior written permission.
16
 *
17
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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
26
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
 */
28
 
29
#include <userspace.h>
30
#include <arch/pm.h>
31
#include <arch/types.h>
32
#include <arch.h>
1078 jermar 33
#include <proc/uarg.h>
703 jermar 34
#include <mm/as.h>
257 palkovsky 35
 
36
 
37
/** Enter userspace
38
 *
39
 * Change CPU protection level to 3, enter userspace.
40
 *
41
 */
1078 jermar 42
void userspace(uspace_arg_t *kernel_uarg)
257 palkovsky 43
{
413 jermar 44
    ipl_t ipl;
257 palkovsky 45
 
413 jermar 46
    ipl = interrupts_disable();
257 palkovsky 47
 
1102 palkovsky 48
    /* Clear CF,PF,AF,ZF,SF,DF,OF */
49
    ipl &= ~ (0xbc4);
50
 
257 palkovsky 51
    __asm__ volatile (""
1066 jermar 52
              "pushq %0\n"
53
              "pushq %1\n"
54
              "pushq %2\n"
55
              "pushq %3\n"
56
              "pushq %4\n"
1078 jermar 57
              "movq %5, %%rax\n"
1066 jermar 58
              "iretq\n"
59
              : :
60
              "i" (gdtselector(UDATA_DES) | PL_USER),
1078 jermar 61
              "r" (kernel_uarg->uspace_stack+THREAD_STACK_SIZE),
802 palkovsky 62
              "r" (ipl),
63
              "i" (gdtselector(UTEXT_DES) | PL_USER),
1078 jermar 64
              "r" (kernel_uarg->uspace_entry),
65
              "r" (kernel_uarg->uspace_uarg)
66
              : "rax"
67
              );
257 palkovsky 68
 
69
    /* Unreachable */
1078 jermar 70
    for(;;)
71
        ;
257 palkovsky 72
}