Subversion Repositories HelenOS

Rev

Rev 1787 | Rev 2071 | 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
 
1888 jermar 29
/** @addtogroup amd64  
1702 cejka 30
 * @{
31
 */
32
/** @file
33
 */
34
 
257 palkovsky 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>
257 palkovsky 41
 
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)
257 palkovsky 49
{
413 jermar 50
    ipl_t ipl;
257 palkovsky 51
 
413 jermar 52
    ipl = interrupts_disable();
257 palkovsky 53
 
1102 palkovsky 54
    /* Clear CF,PF,AF,ZF,SF,DF,OF */
1119 palkovsky 55
    ipl &= ~(0xcd4);
1102 palkovsky 56
 
257 palkovsky 57
    __asm__ volatile (""
1066 jermar 58
              "pushq %0\n"
59
              "pushq %1\n"
60
              "pushq %2\n"
61
              "pushq %3\n"
62
              "pushq %4\n"
1078 jermar 63
              "movq %5, %%rax\n"
1066 jermar 64
              "iretq\n"
65
              : :
66
              "i" (gdtselector(UDATA_DES) | PL_USER),
1078 jermar 67
              "r" (kernel_uarg->uspace_stack+THREAD_STACK_SIZE),
802 palkovsky 68
              "r" (ipl),
69
              "i" (gdtselector(UTEXT_DES) | PL_USER),
1078 jermar 70
              "r" (kernel_uarg->uspace_entry),
71
              "r" (kernel_uarg->uspace_uarg)
72
              : "rax"
73
              );
257 palkovsky 74
 
75
    /* Unreachable */
1078 jermar 76
    for(;;)
77
        ;
257 palkovsky 78
}
1702 cejka 79
 
1888 jermar 80
/** @}
1702 cejka 81
 */