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| 1 | /* |
1 | /* |
| 2 | * Copyright (C) 2005 Jakub Jermar |
2 | * Copyright (C) 2005 Jakub Jermar |
| 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 ia32 |
|
| - | 30 | * @{ |
|
| - | 31 | */ |
|
| - | 32 | /** @file |
|
| - | 33 | */ |
|
| - | 34 | ||
| 29 | #include <userspace.h> |
35 | #include <userspace.h> |
| 30 | #include <arch/pm.h> |
36 | #include <arch/pm.h> |
| 31 | #include <arch/types.h> |
37 | #include <arch/types.h> |
| 32 | #include <arch.h> |
38 | #include <arch.h> |
| 33 | #include <proc/uarg.h> |
39 | #include <proc/uarg.h> |
| 34 | #include <mm/as.h> |
40 | #include <mm/as.h> |
| 35 | 41 | ||
| 36 | 42 | ||
| 37 | /** Enter userspace |
43 | /** Enter userspace |
| 38 | * |
44 | * |
| 39 | * Change CPU protection level to 3, enter userspace. |
45 | * Change CPU protection level to 3, enter userspace. |
| 40 | * |
46 | * |
| 41 | */ |
47 | */ |
| 42 | void userspace(uspace_arg_t *kernel_uarg) |
48 | void userspace(uspace_arg_t *kernel_uarg) |
| 43 | { |
49 | { |
| 44 | ipl_t ipl; |
50 | ipl_t ipl; |
| 45 | 51 | ||
| 46 | ipl = interrupts_disable(); |
52 | ipl = interrupts_disable(); |
| 47 | 53 | ||
| 48 | __asm__ volatile ( |
54 | __asm__ volatile ( |
| 49 | /* |
55 | /* |
| 50 | * Clear nested task flag. |
56 | * Clear nested task flag. |
| 51 | */ |
57 | */ |
| 52 | "pushfl\n" |
58 | "pushfl\n" |
| 53 | "pop %%eax\n" |
59 | "pop %%eax\n" |
| 54 | "and $0xffffbfff, %%eax\n" |
60 | "and $0xffffbfff, %%eax\n" |
| 55 | "push %%eax\n" |
61 | "push %%eax\n" |
| 56 | "popfl\n" |
62 | "popfl\n" |
| 57 | 63 | ||
| 58 | /* Set up GS register (TLS) */ |
64 | /* Set up GS register (TLS) */ |
| 59 | "movl %6, %%gs\n" |
65 | "movl %6, %%gs\n" |
| 60 | 66 | ||
| 61 | "pushl %0\n" |
67 | "pushl %0\n" |
| 62 | "pushl %1\n" |
68 | "pushl %1\n" |
| 63 | "pushl %2\n" |
69 | "pushl %2\n" |
| 64 | "pushl %3\n" |
70 | "pushl %3\n" |
| 65 | "pushl %4\n" |
71 | "pushl %4\n" |
| 66 | "movl %5, %%eax\n" |
72 | "movl %5, %%eax\n" |
| 67 | "iret\n" |
73 | "iret\n" |
| 68 | : |
74 | : |
| 69 | : "i" (selector(UDATA_DES) | PL_USER), "r" (kernel_uarg->uspace_stack+THREAD_STACK_SIZE), |
75 | : "i" (selector(UDATA_DES) | PL_USER), "r" (kernel_uarg->uspace_stack+THREAD_STACK_SIZE), |
| 70 | "r" (ipl), "i" (selector(UTEXT_DES) | PL_USER), "r" (kernel_uarg->uspace_entry), |
76 | "r" (ipl), "i" (selector(UTEXT_DES) | PL_USER), "r" (kernel_uarg->uspace_entry), |
| 71 | "r" (kernel_uarg->uspace_uarg), |
77 | "r" (kernel_uarg->uspace_uarg), |
| 72 | "r" (selector(TLS_DES)) |
78 | "r" (selector(TLS_DES)) |
| 73 | : "eax"); |
79 | : "eax"); |
| 74 | 80 | ||
| 75 | /* Unreachable */ |
81 | /* Unreachable */ |
| 76 | for(;;) |
82 | for(;;) |
| 77 | ; |
83 | ; |
| 78 | } |
84 | } |
| - | 85 | ||
| - | 86 | /** @} |
|
| - | 87 | */ |
|
| - | 88 | ||
| 79 | 89 | ||