Subversion Repositories HelenOS

Rev

Rev 3168 | Only display areas with differences | Ignore whitespace | Details | Blame | Last modification | View Log | RSS feed

Rev 3168 Rev 4345
1 
/*
 1 
/*
2 
 * Copyright (c) 2005 Ondrej Palkovsky
 2 
 * Copyright (c) 2005 Ondrej Palkovsky
3 
 * All rights reserved.
 3 
 * All rights reserved.
4 
 *
 4 
 *
5 
 * Redistribution and use in source and binary forms, with or without
 5 
 * Redistribution and use in source and binary forms, with or without
6 
 * modification, are permitted provided that the following conditions
 6 
 * modification, are permitted provided that the following conditions
7 
 * are met:
 7 
 * are met:
8 
 *
 8 
 *
9 
 * - Redistributions of source code must retain the above copyright
 9 
 * - Redistributions of source code must retain the above copyright
10 
 *   notice, this list of conditions and the following disclaimer.
 10 
 *   notice, this list of conditions and the following disclaimer.
11 
 * - Redistributions in binary form must reproduce the above copyright
 11 
 * - Redistributions in binary form must reproduce the above copyright
12 
 *   notice, this list of conditions and the following disclaimer in the
 12 
 *   notice, this list of conditions and the following disclaimer in the
13 
 *   documentation and/or other materials provided with the distribution.
 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
 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.
 15 
 *   derived from this software without specific prior written permission.
16 
 *
 16 
 *
17 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 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
 18 
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 19 
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 20 
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 21 
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 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
 23 
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 
 
35 
#include <userspace.h>
 35 
#include <userspace.h>
36 
#include <arch/pm.h>
 36 
#include <arch/pm.h>
37 
#include <arch/types.h>
 37 
#include <arch/types.h>
38 
#include <arch.h>
 38 
#include <arch.h>
39 
#include <proc/uarg.h>
 39 
#include <proc/uarg.h>
40 
#include <mm/as.h>
 40 
#include <mm/as.h>
41 
 
 41 
 
42 
 
 42 
 
43 
/** Enter userspace
 43 
/** Enter userspace
44 
 *
 44 
 *
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 
 */
84 
 
 81