Subversion Repositories HelenOS

Rev

Rev 2071 | Rev 2099 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
1 jermar 1
/*
2071 jermar 2
 * Copyright (c) 2005 Jakub Jermar
1 jermar 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
 
1888 jermar 29
/** @addtogroup ia32   
1702 cejka 30
 * @{
31
 */
32
/** @file
33
 */
34
 
1 jermar 35
#include <userspace.h>
36
#include <arch/pm.h>
37
#include <arch/types.h>
38
#include <arch.h>
1078 jermar 39
#include <proc/uarg.h>
703 jermar 40
#include <mm/as.h>
1 jermar 41
 
65 decky 42
 
43
/** Enter userspace
44
 *
45
 * Change CPU protection level to 3, enter userspace.
46
 *
47
 */
1078 jermar 48
void userspace(uspace_arg_t *kernel_uarg)
1 jermar 49
{
413 jermar 50
    ipl_t ipl;
1121 jermar 51
 
413 jermar 52
    ipl = interrupts_disable();
22 jermar 53
 
2082 decky 54
    asm volatile (
1078 jermar 55
        /*
56
         * Clear nested task flag.
57
         */
703 jermar 58
        "pushfl\n"
59
        "pop %%eax\n"
1078 jermar 60
        "and $0xffffbfff, %%eax\n"
703 jermar 61
        "push %%eax\n"
62
        "popfl\n"
141 vana 63
 
1112 palkovsky 64
        /* Set up GS register (TLS) */
65
        "movl %6, %%gs\n"
66
 
125 jermar 67
        "pushl %0\n"
68
        "pushl %1\n"
69
        "pushl %2\n"
70
        "pushl %3\n"
71
        "pushl %4\n"
1078 jermar 72
        "movl %5, %%eax\n"
1104 jermar 73
        "iret\n"
315 jermar 74
        :
1078 jermar 75
        : "i" (selector(UDATA_DES) | PL_USER), "r" (kernel_uarg->uspace_stack+THREAD_STACK_SIZE),
76
          "r" (ipl), "i" (selector(UTEXT_DES) | PL_USER), "r" (kernel_uarg->uspace_entry),
1112 palkovsky 77
        "r" (kernel_uarg->uspace_uarg),
78
        "r" (selector(TLS_DES))
315 jermar 79
        : "eax");
65 decky 80
 
81
    /* Unreachable */
703 jermar 82
    for(;;)
83
        ;
1 jermar 84
}
1702 cejka 85
 
1888 jermar 86
/** @}
1702 cejka 87
 */