Subversion Repositories HelenOS

Rev

Rev 3222 | 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"
3222 svoboda 73 
 
74 
        /* %ebx is defined to hold pcb_ptr - set it to 0 */
75 
        "xorl %%ebx, %%ebx\n"  
76 
 
1104 jermar 77 
        "iret\n"
315 jermar 78 
        :
2575 jermar 79 
        : "i" (selector(UDATA_DES) | PL_USER),
80 
          "r" ((uint8_t *) kernel_uarg->uspace_stack +
81 
              THREAD_STACK_SIZE),
82 
          "r" (ipl),
83 
          "i" (selector(UTEXT_DES) | PL_USER),
84 
          "r" (kernel_uarg->uspace_entry),
85 
          "r" (kernel_uarg->uspace_uarg),
86 
          "r" (selector(TLS_DES))
315 jermar 87 
        : "eax");
65 decky 88 
 
89 
    /* Unreachable */
703 jermar 90 
    for(;;)
91 
        ;
1 jermar 92 
}
1702 cejka 93 
 
1888 jermar 94 
/** @}
1702 cejka 95 
 */